Description:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(Section 10 and Rule 13)

1. TITLE OF THE INVENTION:
UNIVERSAL IMPACTOR INSTRUMENT
2. APPLICANT:
Meril Corporation (I) Private Limited, an Indian company of the address Survey No. 135/139, Muktanand Marg, Bilakhia House, Pardi, Vapi, Valsad-396191 Gujarat, India.

The following specification particularly describes the invention and the manner in which it is to be performed:

 
FIELD OF INVENTION
[001] The present disclosure relates to a surgical instrument. More particularly, the present disclosure relates to a universal impactor instrument.
BACKGROUND OF INVENTION
[002] Joint replacement surgical procedures such as, hip replacement, shoulder replacement, shoulder replacement and the like are intended to replace affected portion of the joints. In joint replacement surgeries, prosthetics are implanted after removing the damaged potion of the joint. For example, in a partial knee replacement procedure, an affected portion of the knee is replaced by a prosthetic. The partial knee replacement targets a specific compartment like the medial, lateral, or patella-femoral compartment of the knee joint. The prosthetic is implanted after removing the damaged portion of the knee.
[003] To implant the prosthetic (or implant), an operator requires a combination of instruments to perform the said procedure. For example, an impactor instrument is used to place or insert a component of the knee prosthetic inside the knee portion and an extractor instrument is used to remove the component from the surgical site. Both impactor and extractor instruments are essential for ensuring the success of orthopedic procedures, providing precision and control during both the placement and removal of the prosthetic implant.
[004] Conventionally, a dedicated impactor and extractor instrument is used to insert a component of an implant during a joint replacement procedure. Considering an example of a partial knee replacement surgery, a knee implant used in this surgery, typically, includes a femoral component, a tibial component and a liner. Currently, separate impactor and extractor instruments are used for each of these components. Similarly, dedicated impactor and extractor instruments are used for different components of an implant in other joint replacement surgeries.
[005] The use of separate instruments for impaction and extraction for different components of an implant has several disadvantages. For example, setting up such different impactor, extractor instruments and switching between the said instruments, increases the overall time and complexity for the surgical procedures. Further, it may also lead to procedural errors, negatively affecting the outcome of the surgery. Moreover, sterilization requirements for several instruments too add to the complexity and time of the surgery. Further, the increased number of components for the surgery, add to the inventory of the surgery and hence, increases the cost of the surgery.
[006] A conventional instrument includes a component (e.g., a head component) that provides a supporting surface to couple with a component of an implant for impaction. Typical coupling methods between the said component and the instrument are prone to ingression of debris. One such coupling method includes a screw fit mechanism which would require a cavity on the said component and the distal end of the instrument to receive a screw for coupling. The cavity is highly prone to ingression of debris from the procedure towards the distal end of the instrument. The ingression of debris leads to accumulation of contaminants and bacterial growth around the cavity and the said component of the instrument. This poses risks during surgeries and complicates the cleaning and sterilization processes.
[007] Therefore, there arises a need for an impactor instrument which can overcome the problems associated with the conventional instruments.
SUMMARY OF THE INVENTION
[008] Particular embodiments of the present disclosure are described herein below with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are mere examples of the disclosure, which may be embodied in various forms. Well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
[009] The present disclosure relates to an impactor instrument for a joint replacement procedure. In an embodiment, the impactor instrument includes a body, a handle, an elongated shaft, an adaptor, and an extension. The body includes a passage extending from a proximal end to a distal end of the body. The handle is coupled to the body at the proximal end of the body and includes a flat surface, at a proximal end, capable of receiving an impact. The elongated shaft is coupled to the handle and resides in the passage of the body. The adaptor includes a proximal portion coupled to the elongated shaft and a distal portion. The extension includes a proximal portion coupled to the distal portion of the adaptor and a distal portion removably coupled with an attachment.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The summary above and the detailed description of descriptive embodiments, is better understood when read in conjunction with the apportioned drawings. For illustration of the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the disclosure is not limited to specific methods and instrumentality disclosed herein. Moreover, those in the art will understand that the drawings are not to scale.
[0011] Fig. 1 depicts an isometric view of an impactor instrument 100 (or instrument 100), according to an embodiment of the present disclosure.
[0012] Fig. 1a depicts a frontal cross-sectional view of the instrument 100, according to an embodiment of the present disclosure.
[0013] Fig. 1b depicts a longitudinal cross-sectional view of the instrument 100, according to an embodiment of the present disclosure.
[0014] Fig. 1c depicts an exploded view of a distal portion of the instrument 100, according to an embodiment of the present disclosure.
[0015] Fig. 1d depicts a perspective view of a body 120 of the instrument 100, according to an embodiment of the present disclosure.
[0016] Fig. 1e depicts a cross-sectional view of the body 120 of the instrument 100, according to an embodiment of the present disclosure.
[0017] Fig. 1f depicts an isometric view of a clamp 160 of the instrument 100, according to an embodiment of the present disclosure.
[0018] Fig. 1g depicts an isometric view of a torsion spring 163 of the instrument 100, according to an embodiment of the present disclosure.
[0019] Fig. 2a depicts an exploded view of a proximal portion of the instrument 100, according to an embodiment of the present disclosure.
[0020] Fig. 2b depicts an isometric view of an elongated shaft 130 and a handle 140, according to an embodiment of the present disclosure.
[0021] Figs. 2c and 2d depict perspective views of a coil spring 112, and an adaptor 110 of the instrument 100, according to an embodiment of the present disclosure.
[0022] Fig. 2e depicts an isometric view of an extension 170 of the instrument 100, according to an embodiment of the present disclosure.
[0023] Fig. 2f depicts a cross-sectional view showing the coupling between the adaptor 110 and the extension 170 using the coil spring 170, according to an embodiment of the present disclosure.
[0024] Fig. 3 depicts the instrument 100 coupled to an attachment 300, according to an embodiment of the present disclosure.
[0025] Fig. 3a depicts an exploded view of the attachment 300, according to an embodiment of the present disclosure.
[0026] Fig. 4 depicts the instrument 100 coupled to an attachment 400, according to an embodiment of the present disclosure.
[0027] Fig. 4a depicts an exploded view of the attachment 400, according to an embodiment of the present disclosure.
[0028] Fig. 5 depicts the instrument 100 coupled to an attachment 500, according to an embodiment of the present disclosure.
[0029] Figs. 5a and 5b depict perspective views of the attachment 500, according to an embodiment of the present disclosure.
[0030] Fig. 6 depicts the instrument 100 coupled to an attachment 600, according to an embodiment of the present disclosure.
[0031] Fig. 6a depicts an exploded view of the attachment 600, according to an embodiment of the present disclosure.
[0032] Fig. 7 depicts the instrument 100 coupled to an attachment 700, according to an embodiment of the present disclosure.
[0033] Figs. 7a and 7b depict perspective views of the attachment 700, according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE DRAWINGS
[0034] Prior to describing the disclosure in detail, definitions of certain words or phrases used throughout this patent document will be defined: the terms "include" and "comprise", as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrases "coupled with" and "associated therewith", as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have a property of, or the like. Definitions of certain words and phrases are provided throughout this patent document, and those of ordinary skill in the art will understand that such definitions apply in many, if not most, instances to prior as well as future uses of such defined words and phrases.
[0035] Reference throughout this specification to “one embodiment,” “an embodiment,” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases “in one embodiment,” “in an embodiment,” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment, but mean “one or more but not all embodiments” unless expressly specified otherwise. The terms “including,” “comprising,” “having,” and variations thereof mean “including but not limited to” unless expressly specified otherwise. An enumerated listing of items does not imply that any or all of the items are mutually exclusive and/or mutually inclusive, unless expressly specified otherwise. The terms “a,” “an,” and “the” also refer to “one or more” unless expressly specified otherwise.
[0036] Although the operations of exemplary embodiments of the disclosed method may be described in a particular, sequential order for convenient presentation, it should be understood that the disclosed embodiments can encompass an order of operations other than the particular, sequential order disclosed. For example, operations described sequentially may in some cases be rearranged or performed concurrently. Further, descriptions and disclosures provided in association with one particular embodiment are not limited to that embodiment, and may be applied to any embodiment disclosed herein. Moreover, for the sake of simplicity, the attached figures may not show the various ways in which the disclosed system, method, and apparatus can be used in combination with other systems, methods, and apparatuses.
[0037] Furthermore, the described features, advantages, and characteristics of the embodiments may be combined in any suitable manner. One skilled in the relevant art will recognize that the embodiments may be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments. These features and advantages of the embodiments will become more fully apparent from the following description and apportioned claims, or may be learned by the practice of embodiments as set forth hereinafter.
[0038] The present disclosure relates to an impactor instrument (hereinafter instrument) used during a partial knee replacement procedure. In an embodiment, the proposed instrument includes an extension that may be removably coupled to a plurality of attachments. Each attachment couples with a corresponding component of an implant for the partial knee replacement. During the partial knee replacement surgery, various components of an implant can be impacted using the proposed instrument by simply coupling/decoupling a respective attachment with the instrument as needed. For example, during the partial knee replacement surgery, the instrument may function as the impactor for any of a femoral component, a tibial base plate, a liner, a keel, and the like. Thus, the instrument functions as a universal impactor. The proposed instrument eliminates the requirement of dedicated impactor instruments for various implant components in different surgical procedures providing one universal instrument for multiple joint replacement surgeries. Consequently, the number of instruments needed for a surgery, the complexity associated with sterilizing such multiple instruments and procedural time are reduced. As a result, the overall effectiveness of the procedure is improved. Though the present disclosure has been explained in the context of a partial knee replacement, the teachings of the present disclosure may be extended to other joint replacement surgeries without deviating from the scope of the present disclosure.
[0039] Now referring to the figures, Fig. 1 depicts an isometric view of an impactor instrument 100 (hereinafter, instrument 100), according to an embodiment of the present disclosure. Figs. 1a and 1b depicts a frontal and a longitudinal cross-sectional view respectively. Further, Fig. 1c depicts an exploded view of the instrument 100, according to an embodiment of the present disclosure. The instrument 100 functions as a universal impactor for impacting various component of an implant (including a trial implant) during a partial knee replacement procedure. The instrument 100 may be removably coupled with any desired attachment capable of coupling with an implant or a component thereof, as needed, for impacting the implant (or the component thereof) during the partial knee replacement procedure (an initial implantation and/or a revision procedure), the instrument 100 may be removably coupled with different attachments capable of coupling with, for example, a femoral component, (including a trial femoral component), a tibial base plate (including a trial tibial base plate and an actual tibial base plate) and a liner (including a trial line and an actual liner) for impacting the respective component. Thus, the same instrument 100 is used to impact multiple components of a partial knee implant.
[0040] The instrument 100 has a proximal end 100a and a distal end 100b. In an embodiment, the instrument 100 includes an adaptor 110, a body 120, an elongated shaft 130, a pair of clamps 160, a handle 140, a strike plate 150 and an extension 170.
[0041] Referring to Figs. 1d and 1e, the body 120 has a proximal end 120a and a distal end 120b. The body 120 has a tubular structure defining a passage 125 extending from the proximal end 120a to the distal end 120b. In an embodiment, the passage 125 has a stepped configuration with a distal section 125b of the passage 125 having a larger diameter than a proximal section 125a of the passage 125. The body 120 may be made from a material, such as, without limitations, Precipitation Hardened Stainless Steel, titanium, cobalt-chromium (CoCr), Nitinol or any other medical grade, biocompatible metal. In an embodiment, the body 120 is made of precipitation hardened stainless steel. The body 120 may optionally include a plurality of windows 126. The windows 126 extends at least partially along the length of the body 120. The windows 126 reduce the overall weight of the instrument 100, facilitating easy handling of the instrument 100 and reducing manufacturing cost. The windows 126 also provide an inside view of the body 120 and help a medical practitioner to view at least a portion of the passage 125. The body 120 also includes at least a pair of arms 121.
[0042] In an embodiment, the body 120 include two pairs of the arms 121 at the distal end 120b, with each pair of arms 121 positioned on a lateral side of the body 120 as depicted in Fig 1d. The arms 121 are coupled to the body 120 using any coupling mechanism, such as, welding, soldering, brazing, riveting, bolting, clamping, etc. The arms 121 extends outward from the body 120. Each of the arms 121 includes an aperture 124. The apertures 124 help in coupling the body 120 with the clamps 160.
[0043] The body 120 includes one or more flanges 122 at the proximal end 120a. The one or more flanges 122 provide extra stability to the instrument 100 while operating the instrument 100 during surgical procedures.
[0044] The pair of clamps 160 are coupled to the arms 121 of the body 120 towards the distal end 120b. Fig. 1f depicts one clamp 160 of the pair of clamps 160, according to an embodiment. Each clamp 160 includes a claw 161, a gripping portion 162 and a coupling portion 164. The gripping portion 162 is disposed at a proximal end of the clamp 160, the claw 161 is disposed at a distal end of the clamp 160 and the coupling portion 164 is disposed between the claw 161 and the gripping portion 162. The claws 161 are configured to grip a femoral component (e.g., a trial femoral component or an actual femoral component) during an implantation procedure. The gripping portions 162 enable the user to manipulate the claws 161 to grip and/or release the femoral component as needed during the implantation procedure. A portion of the claws 161 of the clamps 160 extends over the adaptor 110 (depicted in Fig. 1). In an embodiment, a distal end of the claws 161 has a curved portion 161a to provide a better grip to the femoral component. The curved portion 161a has a pre-defined shape, such as, without limitation, J-shape, L-shape, U-shape, etc. In the depicted embodiment, the curved portion 161a is J-shaped. Each clamp 160 is coupled to a respective arm 121 of the body 120 using any coupling mechanism known in the art. According to an embodiment, each clamp 160 is coupled with the corresponding pair of arms 121 using a respective pin 166 (shown Fig. 1). The coupling portion 164 of each clamp 160 includes an aperture 165 configured to receive the pin 166. The coupling portion 164 is disposed in a gap between a corresponding pair of arms 121 and the aperture 165 aligns with apertures 124 of the pair of arms 121. The pin 166 is disposed in the aperture 165 and the apertures 124, thereby coupling the clamp 160 with the respective pair of arms 121. coupling portion 164. Further, each clamp 160 includes a torsion spring 163. The torsion spring 163 is coupled to the clamp 160 and the body 120. The torsion spring 163 stores energy and facilitate the clamp 160 to perform the manipulation function. Fig. 1g illustrates an exemplary torsion spring 163, according to an embodiment. The torsion spring 163 includes a first arm 163a, a second arm 163b and coils 163c provided therebetween. The coils 163c define a cavity 163d. The gripping portion 162 of the clamp 160 includes a recess (not shown) to receive the first arm 163a of the respective torsion spring 163. The second arm 163b rests on the outer surface of the body 120. The cavity 163d aligns with the aperture 165 and the apertures 124 and receive the pin 166. The torsion springs 163 provide a controlled force and resistance when operating the clamps 160. The pins 166 provide additional stability and reinforcement to a joint where the clamps 160 are coupled to the arms 121. The clamps 160 may be made of a material, for example, a medical grade metal. In an exemplary implementation, the clamps 160 are made of stainless steel. The torsion springs 163 and the pins 166 may be made of a medical grade metal, for example, stainless steel.
[0045] When the gripping portions 162 are pressed towards each other, the claws 161 rotate around a respective hinge point (defined by the apertures 124) to move away from each other. As a result, the torsion springs 163 are in a compressed state. When the gripping portions 162 are released, the torsion springs 163 apply a biasing force on the clamps 160, causing the claws 161 to rotate around the respective hinge point towards each other. This facilitates the claws 161 to grip a femoral component during the operation of the instrument 100.
[0046] The handle 140 is provided at the proximal end 100a. The handle 140 is generally cylindrical. The handle 140 includes a head 141 provided at a proximal end 140a of the handle 140 and a threaded portion 144 extending from the head 141 towards a distal end 140b of the handle 140 (shown in Figs. 2a and 2b). In an embodiment, the handle 140 is coupled to the body 120 at the proximal end 120a body 120 using a threaded mechanism, though any other coupling mechanism may be used. For example, threads 142 are provided on the threaded portion 144 of the handle 140 and are configured to engage with corresponding inner threads 128 provided on an inner surface of the passage 125 of the body 120 towards the proximal end 120a (see Fig. 1e). The handle 140 provides a convenient way to operate the instrument 100. The head 141 enables the user to grip the instrument 100 and operate the instrument 100. In an embodiment, the head 141 may be rotatable in clockwise and anticlockwise direction. The head 141 is ergonomically designed to provide a secure and comfortable grip to the user. The head 141 may have a flat surface at the proximal end 140a of the handle 140. The user can impact on the flat surface using, for example, a mallet, when inserting a component of an implant, for example, a tibial base plate, a tibial liner, and the like. The handle 140 may be made of a material, such as, without limitation, precipitation hardened stainless steel, titanium, CoCr, nitinol or any other medical grade, biocompatible metal. In an embodiment, the handle 140 is made of precipitation hardened stainless steel.
[0047] Now referring to Fig. 2a, the instrument 100 may optionally include the strike plate 150. The strike plate 150 is configured to receive impact or blow by an external instrument such as hammer for impaction of a component of an implant. At least a portion of the strike plate 150 includes an enlarged surface area to receive impact or blow. Such design of the strike plate 150 ensures proper impaction received by the blow of the external instrument such as mallet or hammer. The strike plate 150 promotes structural integrity of the instrument 100. The strike plate 150 has a first end 150a and a second end 150b. The strike plate 150 includes a first portion 155 provided towards the first end 150a and a second portion 156 extending from the first portion 155 towards the second end 150b. The first portion 155 of the strike plate 150 is generally cylindrical. A bottom face (not shown) of the second portion 156 at the second end 150b provides a surface for impacting the instrument 100 using an external device, e.g., a hammer or a mallet. The strike plate 150 is coupled to the handle 140 using the first portion 155. The strike plate 150 may be coupled to the handle 140 using a coupling mechanism, such as, without limitation, fastening, threaded coupling, welding, bolting, brazing, snap fit, press fit, taper fit, etc. In an embodiment, the handle 140 and the strike plate 150 are coupled using a fastener, such as, a fastener 152. The head 141 of the handle 140 includes a cavity 143 provided at the proximal end of the handle 140. The cavity 143 is configured to receive and couple with the fastener 152. The fastener 152 has a distal portion 152b, a proximal portion 152a and a middle portion 152c therebetween. The proximal portion 152a provides a driving surface for fastening the fastener 152. The distal portion 152b of the fastener 152 includes threads 152d. The threads 152d of the fastener 152 are complementary to and engage with threads 143a provided inside the cavity 143. In an embodiment, an aperture 151 is provided on the first portion 155 of the strike plate 150. The distal portion 150b and the middle portion 152c of the fastener 152 are received by the aperture 151 of the strike plate 150 and couples with the head 141, thereby coupling the strike plate 150 with the handle 140. The proximal portion 152a resides outside the aperture 151 providing a surface for fastening. A washer 153 is provided to prevent loosening of the fastener 152, for example, due to vibrations produced when the strike plate 150 is impacted during the operation of the instrument 100. The washer 153 may be a split lock washer, a flat washer, a fender washer, a conical washer, etc. In an embodiment, the washer 153 is a split lock washer. The washer 153 increases friction between the two threaded surface of the threads 152d of the fastener 152 and the threaded cavity 143 and prevents the coupling from loosening during the operation of the instrument 100. In an embodiment, the washer 153 includes a helical spring split at one point, creating a gap. In this case, when the strike plate 150 is impacted with a hammer, the washer 153 gets compressed between the fastener 152 and an upper surface of the first portion 155 of the strike plate 150. The spring action of the washer 153 generates a preload force, which helps to maintain tension and prevents loosening of the coupling. Further, the first portion 155 of the strike plate 150 includes protrusions 154. The protrusions 154 are disposed are diametrically opposite to each other and are adjacent to the aperture 151. The protrusions 154 reside in the cavity 143 provided in the handle 140, preventing the handle 140 from rotating and stay in fixed position when the strike plate 150 is coupled and impacted. The second portion 156 of the strike plate 150 is elongated and has a generally rectangular shape having a curved end at the second end 150b of the strike plate 150. In an embodiment, the second portion 156 of the strike plate 150 is receives an impact by an impacting external instrument such as mallet or a hammer. The strike plate 150 may be made from a material, such as, without limitation, stainless steel, precipitation hardened stainless steel, titanium, CoCr, nitinol or any other medical grade, biocompatible metal. In an embodiment, the strike plate 150 is made from stainless steel.
[0048] Now referring to Fig. 2b, the elongated shaft 130 extends from the distal end 140b of the handle 140 towards the distal end 100b. The elongated shaft 130 has a proximal end 130a and a distal end 130b. The elongated shaft 130 resides within the passage 125 of the body 120. The elongated shaft 130 is configured to move linearly in response to the rotation of the handle 140. Further, the elongated shaft 130 is configured to transmit a force towards an attachment coupled to the distal end 100b of the instrument 100. The elongated shaft 130 may be coupled to the handle 140 using any coupling technique known in the art. Alternatively, the elongated shaft 130 and the handle 140 may be integrally coupled to form an integrated structure as depicted herein. In an embodiment, the elongated shaft 130 is cylindrical, though the elongated shaft 130 may have any other suitable shape. The elongated shaft 130 may be made of a material, such as, without limitation, precipitation hardened stainless steel, titanium, CoCr, nitinol or any other medical grade, biocompatible metal. In an embodiment, the elongated shaft 130 is made of precipitation hardened stainless steel.
[0049] The elongated shaft 130 is coupled to the adaptor 110 at the distal end 130b of the elongated shaft 130. The adaptor 110 is configured to transmit the force from and/or on the elongated shaft 130 to an attachment coupled to the distal end 100b of the instrument 100.
[0050] Referring to Figs. 2c and 2d, the adaptor 110 includes a proximal portion 110a and a distal portion 110b. The proximal portion 110a is disposed towards a proximal end of the adaptor 110 and the distal portion 110b is disposed towards a distal end of the adaptor 110. In an embodiment, the distal portion 110b is extruded from the proximal portion 110a. It should be understood that though the distal portion 110b and the proximal portion 110a are explained herein as forming an integrated structure (or integrally coupled), it is possible that the distal portion 110b and the proximal portion 110a may be separate components coupled together using any suitable coupling mechanism. According to an embodiment, the distal portion 110b and the proximal portion 110a are cylindrical, though they may have any other suitable shape. The distal portion 110b and the proximal portion 110a may have the same or different diameters. In the depicted embodiment, the distal portion 110b has a smaller diameter than that of the proximal portion 110a.
[0051] In an embodiment, the proximal portion 110a is coupled to the body 120. For example, the proximal portion 110a of the adaptor 110 is at least partially disposed in the distal portion of the passage 125 of the body 120 (as depicted in Fig. 1a) and is coupled with the body 120 using, for example, one or more pins 123 as depicted in Fig. 1c. The body 120 includes an orifice 127 (see Fig. 1e) provided on each lateral side of the body 120. Each orifice 127 is configured to receive a respective pin 123. In an embodiment, the body 120 includes two orifices 127. Further, the proximal portion 110a includes a slot 115 provided on each lateral side of the proximal portion 110a. Each slot 115 receives a respective pin 123. Thus, each pin 123 passes through a respective orifice 127 of the body 120 and is disposed within a respective slot 115 of the adaptor110. Each pin 123 is slidable within the respective slot 115, facilitating relative movement between the adaptor 110 and the body 120. Although, the coupling between the adaptor 110 and the body 120 is described using the one or more pins 123, any other suitable coupling mechanism may be used, instead of or in combination with, the one or more pins 123. The pins 123 may be made of a medical grade, biocompatible metal, for example, stainless steel.
[0052] The proximal portion 110a is also coupled to the elongated shaft 130. The proximal portion 110a includes a cavity 111 extending from the proximal end of the adaptor 110 towards the distal end of the adaptor 110 for a part of the length of the adaptor 110. The cavity 111 is configured to receive a distal portion of the elongated shaft 130 (as shown in Fig. 1b). The cross-sectional shape and cross-sectional dimensions of the cavity 111 are designed such that the elongated shaft 130 is able to move linearly within the cavity 111 during the operation of the instrument 100. In an embodiment, a compression spring 132 (shown in Fig. 1c) is coiled over an outer surface of elongated shaft 130 (as depicted in Figs. 1a and 1b). The compression spring 132 facilitates a relative movement between the elongated shaft 130 and the body 120. The compression spring 132 also provides a resilient force to help returning the elongated shaft 130 to its original position during the operation of the instrument 100.
[0053] The adaptor 110 is coupled with the extension 170. In an embodiment, the extension 170 may be removably coupled to the adaptor 110 using any coupling technique such as, but not limited to, fastening, slot-fit, threaded, bolting, snap fit, press fit, taper fit, etc. In another embodiment, the extension 170 may be fixedly coupled to the adaptor 110 using any coupling technique, such as, without limitations, welding, soldering, brazing, riveting, bolting, clamping, etc. Preferably, the adaptor 110 and the extension 170 are coupled such that the coupling between the extension 170 and the adaptor 110 is not exposed to the outside environment, thus preventing contamination. Any accumulation of debris such as, bone cement used during the operation, which leads to contamination seen in conventional devices, is prevented. In an embodiment, the adaptor 110, specifically, the distal portion 110b of the adaptor 110, is coupled with the extension 170 with the help of the at least one coil spring 112. The at least one coil spring 112 removably couples the extension 170 and the adaptor 110.
[0054] In an embodiment, the at least one coil spring 112 includes one coil spring 112. The coil spring 112 may have any suitable shape such as, but not limited to, square, ring, polygonal, triangular, etc. In an embodiment, the coil spring 112 is ring shaped. The coil spring 112 includes a plurality of coils. The plurality of coils of the coil spring 112 may have a pre-defined cross-sectional shape, such as, but not limited to, rectangular, triangular, polygonal, circular, oval, etc. In an embodiment, the plurality of coils of the coil spring 112 have a circular cross-section. The plurality of coils of the coil spring 112 may have an axial or canted orientation. In an embodiment, the plurality of coils of the coil spring 112 has canted orientation, i.e., the plurality of coils is slanted with respect to a central plane of the coil spring 112. The canted orientation and circular cross-section of the plurality of coils of the coil spring 112 reduces friction between the two contact surfaces of the extension 170 and the adaptor 110. Further, the canted orientation and circular cross-section of the plurality of coils of the coil spring 112 provides enhanced durability, fatigue resistance, flexibility, deflection, etc. The coil spring 112 can be made from any suitable material such as, but not limited to, stainless steel, nickel alloys, copper alloys, high carbon steel, etc. In an embodiment, the coil spring 112 is made of stainless steel.
[0055] The distal portion 110b of the adaptor 110 includes various structural features to facilitate coupling of the adaptor 110 with the extension 170 and the at least one coil spring 112. In an embodiment, the distal portion 110b includes at least one boss 113 as depicted in Fig. 2d. The at least one boss 113 is annular. Each of the at least one boss 113 is configured to receive a portion (e.g., a medial circumference) of a corresponding coil spring 112 of the at least one coil spring 112. In an embodiment, the distal portion 110b has one boss 113. The boss 113 ensures that the coil spring 112 is locked, preventing a longitudinal movement of the coil spring 112, thereby ensuring a secure coupling of the adaptor 110 with the extension 170 (shown in Fig. 2f). Further, the distal portion 110b includes at least one tab 114. In an embodiment, the distal portion 110b includes two tabs 114 positioned opposite to each other around the surface of the distal portion 110b towards its proximal end. The tabs 114 are used to couple the adaptor 110 with the extension 170 and prevent the rotation of the extension 170 during the operation of the instrument 100. The tabs 114 may be extruded. The top surface of the distal portion 110b includes a chamfered edge 116 configured to facilitate the movement of the adaptor 110 inside the extension 170 during their coupling with each other. The chamfered edge 116 is provided circumferentially on the top surface of the distal portion 110b.
[0056] Now referring to Fig. 2e, in an embodiment, the instrument 100 includes an extension 170 at the distal end 100b. The extension 170 is coupled to the adaptor 110 at the distal end of the adaptor 110. The extension 170 may be made from a material, such as, without limitation, precipitation hardened stainless steel, titanium, CoCr, nitinol or any other medical grade, biocompatible metal. In an embodiment, the extension 170 is made from precipitation hardened stainless steel. The extension 170 may have any shape, such as, without limitations, cuboidal, conical, cylindrical, spherical, circular, etc. In an embodiment, the extension 170 is cylindrical. The extension 170 may have a tubular structure. The extension 170 includes a proximal portion 170a situated towards a proximal end of the extension 170 and a distal portion 170b situated towards a distal end of the extension 170. The proximal portion 170a and the distal portion 170b may have the same or different diameters. In the depicted embodiment, the distal portion 170b has a smaller diameter than that of the proximal portion 170a. The proximal portion 170a of the extension 170 includes a cavity 171. The cavity 171 extends from the proximal end towards the distal end of the extension 170 for a partial length of the proximal portion 170a. The cavity 171 is configured to receive the distal portion 110b of the adaptor 110. The distal portion 110b couples with the cavity 171 via a snap-fit mechanism. The extension 170 may include at least one notch 173. The at least one notch 173 is provided at the proximal end of the extension 170, for example, adjacent to a rim of the cavity 171. Each notch 173 of the at least one notch 173 is configured to receive a corresponding tab 114 of the at least one tab 114 of the adaptor 110. In an embodiment, the extension 170 includes two notches 173. The dimensions and positions of the notches 173 correspond to that of the tabs 114. The coupling of the notches 173 with the tabs 114 prevents any unwanted rotation of the extension 170 with respect to the adaptor 110 during the operation of the instrument 100. Further, the extension 170 includes at least one recess 174. The at least one recess 174 extends circumferentially around the inner surface of the cavity 171. Each of the at least one recess 174 is configured to receive a portion (e.g., lateral circumference) of the corresponding coil spring 112 of the at least one coil spring 112. Thus, each coil spring 112 is disposed in a space enclosed by a corresponding boss 113 provided in the adaptor 110 and a corresponding recess 174 provided in the extension 170. In an example implementation, the extension 170 includes one recess 174.
[0057] The distal portion 170b of the extension 170 is configured to couple with a plurality of attachments as explained later. The extension 170 is removably coupled with an attachment with the help of the distal portion 170b. In an embodiment, the distal portion 170b is removably coupled with the attachment. For example, the attachment is provided with a first slot at a first end and the first slot of the attachment is configured to receive and couple with the distal portion 170b of the extension 170. The distal portion 170b is configured to fit within a corresponding first slot of an attachment coupled to the instrument 100. The attachment is designed to couple with a corresponding component of an implant so that the instrument 100 may be used for impacting the component of the implant. The distal portion 170b may be provided with a tapered face at the distal end of the extension 170. The distal portion 170b may, optionally, have a tapered shape wherein a diameter of the distal portion 170b decreases towards the distal end of the extension 170. In an embodiment, the distal portion 170b may have a smooth outer surface and may be removably coupled with an attachment via a coupling technique, such as, without limitation, snap-fit, friction-fit, tapered fit, etc. In another embodiment, the distal portion 170b may have external treads (not shown) provided on at least a partial length of the distal portion 170b and the distal portion 170b may be removably coupled with an attachment via a threaded coupling. It should be understood that the distal portion 170b and an attachment may be removably coupled via any other coupling mechanism (e.g., with the help of a fastener) without deviating from the scope of the present disclosure.
[0058] Coupling of the instrument 100 with exemplary attachments are explained below. It should be understood that the attachments explained herein are merely exemplary and teachings of the present disclosure can be extended to any other attachments designed to couple with respective components of an implant.
[0059] Fig. 3 depicts the instrument 100 coupled with an attachment 300, according to an embodiment of the present disclosure. Fig. 3a depicts an exploded view of the attachment 300. The attachment 300 is removably coupled with the extension 170 of the instrument 100. In an embodiment, the attachment 300 is a poly component impactor. The attachment 300 is configured to impact a poly component of a partial knee implant. The poly component may be any component of an implant made of a polymeric material. The poly components are typically used during a trial phase of the partial knee replacement procedure to select an optimal size of the implant. For example, the poly component may include a trial liner or a trial tibial base plate. The attachment 300 may be made from a material, such as, but not limited to, medical grade acetal co-polymer, polyether ether ketone (PEEK), ultra-high molecular weight polyethylene (UHMWPE), polypropylene (PP), high density polyethylene (HDPE), etc. In an embodiment, the attachment 300 is made of a medical grade acetal co-polymer. The attachment 300 has a first end 300a and a second end 300b. The attachment 300 includes a body 310. In an embodiment, the body 310 slopes upward from the first end 300a towards the second end 300b. The attachment 300 includes a first slot 311 towards the first end 300a and a second slot 312 towards the second end 300b of the attachment 300. The first slot 311 is configured to receive the distal portion 170b of the extension 170 and couple with the distal portion 170b via, for example, a slot-fit mechanism, thereby coupling the attachment 300 and the extension 170. Though in the depicted embodiment, the extension 170 and the attachment 300 are coupled using the slot-fit mechanism, it should be understood that the extension 170 and the attachment 300 may be removably coupled using any other mechanism. For example, internal threads (not shown) may be provided in the first slot 311. The internal threads of the first slot 311 may be complementary to and engage with external threads (not shown) provided on the distal portion 170b of the extension 170, thereby coupling the extension 170 and the attachment 300 via threaded coupling.
[0060] The attachment 300 may include a platform 320 coupled with the body 310 towards the second end 300b. The platform 320 and the body 310 may be coupled using any coupling mechanism, such as, fastening, welding, pin coupling, threaded coupling, riveting, brazing, snap fit, press fit, taper fit, etc. In an embodiment, the platform 320 and the body 310 are coupled using a slot-pin coupling mechanism. The second slot 312 of the attachment 300 receives a projection 321 provided on the platform 320. Further, the attachment 300 includes a pair of first apertures 313 provided on the body 310 at opposite edges of the second slot 312. Further, a second aperture 322 may be provided on the projection 321. The second aperture 322 is aligned with the pair of first apertures 313. A pin 330 is inserted through the pair of first aperture 313 and the second aperture 322. In an embodiment, the platform 320 is rectangular, though the platform 320 may have any other suitable shape. The platform 320 is coupled to the poly component. The attachment 300 is configured to impact the poly component coupled to the platform 320 in response to the instrument 100 receiving an impact.
[0061] During the partial knee replacement surgery, a poly component (e.g., a trial liner) is placed at a desired location on a patient’s body. Further, the handle 140 or the strike plate 150 is impacted using, for example, a hammer or a mallet. The strike plate 150 transfers the impact to the handle 140. Further, the handle 140 transfers the forward motion to the elongated shaft 130. As result, the elongated shaft 130 moves towards the distal end 100b of the instrument 100 inside the passage 125 of the body 120. The distal end of the elongated shaft 130 transfers the impact to the adaptor 110. The adaptor 110 transfers the impact to the extension 170, which in turn transfers the impact to the attachment 300. Consequently, the platform 320 of the attachment 300 transfers the impact to the poly component. As a result, the poly component is affixed at the desired location inside the knee joint.
[0062] Fig. 4 depicts the instrument 100 coupled with an attachment 400, according to an embodiment of the present disclosure. Fig. 4a depicts an exploded view of the attachment 400. The attachment 400 is removably coupled with the extension 170 of the instrument 100. In an embodiment, the attachment 400 is a keel punch insert. The attachment 400 helps the instrument 100 to induce a controlled puncture at a desired location in the tibia for providing an access for a keel of a tibial base plate during surgical procedures. The attachment 400 may be made from a material such as, but not limited to, Medical Grade Acetal Co-polymer, PEEK, UHMWPE, PP, HDPE, etc. In an embodiment, the attachment 400 is made from Medical Grade Acetal Co-polymer. The attachment 400 has a first end 400a and a second end 400b. The attachment 400 includes a body 413. In an embodiment, the body 413 slopes upwards from the first end 400a towards the second end 400b. An edge 410 is provided at the second end 400b of the attachment 400 (as shown in Fig. 4a. The edge 410 may have any shape, such as, rectangular, polygonal, square, spherical, conical, etc. In an embodiment, the edge 410 has a polygonal shape. The edge 410 is configured to create a pathway for a tibial base plate (not shown) in response to the instrument 100 receiving an impact. The attachment 400 includes a first slot 411 provided at the first end 400a. The first slot 411 is configured to receive the distal portion 170b of the extension 170 and couple with the distal portion 170b via, for example, a slot-fit mechanism, thereby coupling the attachment 400 and the extension 170. Though in the depicted embodiment, the extension 170 and the attachment 400 are coupled using the slot-fit mechanism, it should be understood that the extension 170 and the attachment 400 may be removably coupled using any other mechanism. For example, internal threads (not shown) may be provided in the first slot 411. The internal threads of the first slot 411 may be complementary to and engage with external threads (not shown) provided on the distal portion 170b of the extension 170, thereby coupling the extension 170 and the attachment 400 via threaded coupling.
[0063] During the partial knee replacement procedure, the edge 410 of the attachment 400 is placed at a target location on a patient’s body. The handle 140 or the strike plate 150 is impacted using an external source such as a mallet. The impact is transferred to extension 170 of the instrument 100 in similar manner as explained earlier. The extension 170 transfers the impact to the attachment 400, thereby creating force on the edge 410 of the attachment 400. Due to the impact, the edge 410 penetrates a bone at a target location inducing a puncture in the bone and creates a pathway for the tibial base plate.
[0064] Fig. 5 depicts the instrument 100 coupled with an attachment 500, according to an embodiment of the present disclosure. Fig. 5a depicts a perspective view of the attachment 500. The attachment 500 is removably coupled to the instrument 100. In an embodiment, the attachment 500 is a liner impactor. The attachment 500 is configured to impact a liner in response to the instrument 100 receiving an impact. In an embodiment, the liner may be a final liner to be implanted. In another embodiment, the liner may be a trial liner. The attachment 500 may be made from a material, such as, but not limited to, Medical Grade Acetal Co-polymer, PEEK, UHMWPE, PP, HDPE, etc. In an embodiment, the attachment 500 is made of Medical Grade Acetal Co-polymer. The attachment 500 has a first end 500a and a second end 500b. The attachment 500 may have a pre-defined shape such as, without limitations, pyramid, cube, cuboid, cylindrical, hemisphere, frustum, spherical, conical, etc. In an embodiment, the attachment 500 has a frustum shape with the diameter of the attachment 500 decreasing from the first end 500a to the second end 500b. The attachment 500 includes a first slot 511 provided towards the first end 500a. The first slot 511 is configured to receive the distal portion 170b of the extension 170 and couple with the distal portion 170b via, for example, a press-fit mechanism. For example, the distal portion 170b of the extension 170 is inserted into the first slot 511 and the first slot 511 is pressed by an external force, thereby coupling the attachment 500 with the extension 170. Though in the depicted embodiment, the extension 170 and the attachment 500 are coupled using the press-fit mechanism, it should be understood that the extension 170 and the attachment 500 may be removably coupled using any other mechanism such as, but not limited to slot-fit, bayonet fit, snap-fit, etc. A surface 501 at the second end 500b is designed according to the liner that the attachment 500 is used for impacting, for a proper alignment with the liner and a controlled, precise impact. In an embodiment, the surface 501 includes a depression 502 (see Fig. 5b), forming a wave-like shape with two crests at sides of the attachment 500.
[0065] During a partial knee replacement procedure, the second end 500b of the attachment 500 is coupled to a liner (not shown) disposed at a target location on a patient’s anatomy. For example, the liner may be seated in a tibial base plate. The handle 140 or the strike plate 150 is impacted using an external source such as a mallet. The impact is transferred to the attachment 500 in a similar manner as explained earlier. The surface 501 delivers the impact to the liner for a proper fixation at the target location.
[0066] Fig. 6 depicts the instrument 100 coupled with an attachment 600, according to an embodiment of the present disclosure. Fig. 6a depicts an exploded view of the attachment 600. The attachment 600 is removably coupled with the extension 170 of the instrument 100. In an embodiment, the attachment 600 is a tibial base plate impactor configured to impact a tibial base plate during a partial knee replacement procedure. The attachment 600 may be made from a material, such as, but not limited to, Medical Grade Acetal Co-polymer, PEEK, UHMWPE, PP, HDPE, etc. In an embodiment, the attachment 600 is made of Medical Grade Acetal Co-polymer. The attachment 600 has a first end 600a and a second end 600b. The first end 600a includes a body 610, first slot 611 and a second slot 612. The body 610 slopes upward from the first end 600a towards the second end 600b. The attachment 600 includes the first slot 611 towards the first end 600a and the second slot 612 towards the second end 600b of the attachment 600. The first slot 611 is configured to receive the distal portion 170b of the extension 170 and couple with the distal portion 170b via, for example, a slot-fit mechanism, thereby coupling the attachment 600 and the extension 170. Though in the depicted embodiment, the extension 170 and the attachment 600 are coupled using the slot-fit mechanism, it should be understood that the extension 170 and the attachment 600 may be removably coupled using any other mechanism. For example, internal threads (not shown) may be provided in the first slot 611. The internal threads of the first slot 611 may be complementary to and engage with external threads (not shown) provided on the distal portion 170b of the extension 170, thereby coupling the extension 170 and the attachment 600 via a threaded coupling.
[0067] The attachment 600 may include a platform 620 coupled with the body 610 towards the second end 600b. The platform 620 and the body 610 may be coupled using any coupling mechanism, such as, fastening, pin coupling, threaded, welding, bolting, brazing, snap fit, press fit, taper fit, etc. In an embodiment, the platform 620 and the body 610 are coupled using a slot-pin coupling mechanism. The second slot 612 of the attachment 600 receives a projection 621 provided on the platform 620. Further, the attachment 600 includes a pair of first apertures 613 provided on the body 610 at opposite edges of the second slot 612. Further, a second aperture 622 may be provided on the projection 621. The second aperture 622 is aligned with the pair of first apertures 613. A pin 630 is inserted through the pair of first apertures 613 and the second aperture 622. The platform 620 is designed according to the tibial base plate that the attachment 600 is used for impacting, for a proper alignment with the tibial base plate and a controlled, precise impact. In an embodiment, the platform 620 is hexagonal. The platform 620 is coupled with a tibial base plate (not shown). The attachment 600 is configure to impact the tibial base plate coupled to the platform 620 in response to the instrument 100 receiving an impact.
[0068] During a partial knee replacement procedure, the platform 620 of the attachment 600 is coupled with the tibial base plate placed at a target location of a patient’s anatomy. The handle 140 or the strike plate 150 is impacted using an external source such as a mallet. The impact is transferred to the attachment 600 as explained earlier. Due to the impact, the platform 620 applies a force on the tibial base plate, affixing the tibial base plate on a tibial plateau at the target location.
[0069] Fig. 7 depicts the instrument 100 coupled to an attachment 700, according to an embodiment of the present disclosure. Fig. 7a depicts a perspective view of the attachment 700. The attachment 700 is removably coupled with the extension 170 of the instrument 100. In an embodiment, the attachment 700 is a uni-femoral impactor. The attachment 700 is configured to impact a femoral component facilitating a correct alignment of the femoral component within a femoral canal. The attachment 700 may be made of a material, such as, but not limited to, biocompatible plastic, Medical Grade Acetal Co-polymer, PEEK, UHMWPE, PP, HDPE, etc. In an embodiment, the attachment 700 is made of a biocompatible plastic. The attachment 700 has a first end 700a and a second end 700b. The attachment 700 may have a pre-defined shape, such as, but not limited to, a pyramid, cube, cuboid, cylindrical, hemisphere, frustum, spherical, conical, etc. In an embodiment, the attachment 700 has a frustum shape with the diameter of the attachment 700 increasing from the first end 700a to the second end 700b. According to an embodiment, the attachment 700 includes a first slot 711 provided towards the first end 700a. The first slot 711 is configured to receive the distal portion 170b of the extension 170 and couple with the distal portion 170b via, for example, a slot-fit mechanism, thereby coupling the attachment 700 and the extension 170. Though in the depicted embodiment, the extension 170 and the attachment 700 are coupled using the slot-fit mechanism, it should be understood that the extension 170 and the attachment 700 may be removably coupled using any other mechanism. For example, internal threads (not shown) may be provided in the first slot 711. The internal threads of the first slot 711 may be complementary to and engage with external threads (not shown) provided on the distal portion 170b of the extension 170, thereby coupling the extension 170 and the attachment 700 via threaded coupling. A surface 701 of the attachment 700 at the second end 700b couples with the femoral component. In an embodiment, the surface 701 is concave, forming a dais, as shown in Fig. 7b. The attachment 700 is configured to impact the femoral component coupled to the surface 701 in response to the instrument 100 receiving an impact.
[0070] During a partial knee replacement procedure, the surface 701 of the attachment 700 is coupled to a femoral component placed at a target location of a patient’s anatomy. The handle 140 or the strike plate 150 is impacted using an external source such as a mallet. The impact is transferred to the attachment 700 and thence, to the femoral component in similar manner as explained earlier. The impaction results in accurate and secure affixation of the femoral component at the target location.
[0071] The present disclosure provides several advantages over conventional impactor instruments. The proposed impactor instrument acts as a universal impactor instrument in that the proposed instrument is capable of connecting with multiple attachments for impacting various components of an implant during a partial knee replacement surgery. Since different attachments corresponding to different implants and/or components of implants can be easily coupled and decoupled from the proposed instrument, the overall time for the impaction process during the surgeries is reduced. The proposed instrument eliminates the need for separate impactor instruments specialized for a specific component. This decreases the number of instruments required for a surgery, reducing complexity with respect to sterilization of multiple instruments and minimizing the cost. Thus, the proposed instrument enhances the effectiveness of the surgical procedure and improves the overall outcome for the patient.
[0072] The scope of the invention is only limited by the appended patent claims. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present invention is/are used. , Claims:WE CLAIM
1. An impactor instrument (100) for a joint replacement procedure, the impactor instrument (100) comprising:
a. a body (120) having a passage (125) extending from a proximal end (120a) to a distal end (120b) of the body (120);
b. a handle (140) coupled to the body (120) at proximal end (120a) of the body (120) and comprising a flat surface at a proximal end (140a) capable of receiving an impact;
c. an elongated shaft (130) coupled to the handle (140) and residing in the passage (125) of the body (120);
d. an adaptor (110) comprising:
i. a proximal portion (110a) coupled to the elongated shaft (130); and
ii. a distal portion (110b); and
e. an extension (170) comprising:
i. a proximal portion (170a) coupled to the distal portion (110b) of the adaptor (110); and
ii. a distal portion (170b) removably coupled with an attachment (300, 400, 500, 600, 700).
2. The impactor instrument (100) as claimed in claim 1, wherein the proximal portion (110a) of the adaptor (110) comprises a cavity (111) provided at a proximal end of the adaptor (110) and configured to receive, and coupled with, the distal end of the elongated shaft (130).
3. The impactor instrument (100) as claimed in claim 1, wherein the distal portion (110b) of the adaptor (110) and the proximal portion (170a) of the extension (170) are coupled using at least one coil spring (112), wherein:
a. the distal portion (110b) of the adaptor (110) comprises at least one boss (113); and
b. the proximal portion (170a) of the extension (170) comprises:
i. a cavity (171) configured to receive the distal portion (110b) of the adaptor (110); and
ii. at least one recess (174) provided on an inner surface of the cavity (171);
c. wherein each coil spring (112) of the at least one coil spring (112) is disposed in a space created by a corresponding boss (113) and a corresponding recess (174).
4. The impactor instrument (100) as claimed in claim 1, wherein the proximal portion (170a) of the extensions (170) comprises at least one notch (173), each notch (173) configured to receive a corresponding tab (114) provided on the distal portion (110b) of the adaptor (110).
5. The impactor instrument (100) as claimed in claim 1, wherein the proximal portion (110a) of the adaptor (110) is at least partially disposed in a distal section (125b) of the passage (125).
6. The impactor instrument (100) as claimed in claim 1, wherein the distal end (120b) of the body (120) and the proximal portion (110a) of the adaptor (110) are coupled using at least one pin (123), wherein;
a. at least one orifice (127) is provided on each lateral side of the distal end (120b) of the body (120); and
b. at least one slot (115) is provided on each lateral side of the proximal portion (110a) of the adaptor (110); and
wherein each orifice (127) of the body (120) and a corresponding slot (115) of the adaptor (110) receive a corresponding pin (123) of the at least one pin (123).
7. The impactor instrument (100) as claimed in claim 1, wherein the impactor instrument (100) comprises a strike plate (150) coupled to the handle (140) at a proximal end (140a) of the handle (140), wherein the strike plate (150) comprises:
a. a first portion (155) provided at a first end (150a) of the strike plate (150) and coupled to the handle (140); and
a second portion (156) extending from the first portion (155) to a second end (150b) of the strike plate (150) and configured to receive an impact.
8. The impactor instrument (100) as claimed in claim 7, wherein the strike plate (150) and the handle (140) are coupled using a fastener (152), wherein:
a. the handle (140) comprises: a cavity (143) configured to receive a distal portion (152b) of the fastener (152); and
b. the first portion (155) of the strike plate (150) comprises:
i. an aperture (151) configured to receive a middle portion (152c) of the fastener (152); and
ii. at least one protrusion (154) configured to reside inside the cavity (143); and
wherein the fastener (152) passes through aperture (151) and enters the cavity (143).
9. The impactor instrument (100) as claimed in claim 8, wherein a washer (153) sits on a proximal portion (152a) of the fastener (152).
10. The impactor instrument (100) as claimed in claim 1, wherein the attachment (300, 400, 500, 600, 700) comprises a first slot (311, 411, 511, 611, 711) provided at a first end (300a, 400a, 500a, 600a, 700a) and configured to receive and couple with the distal portion (170b) of the extension (170).
11. The impactor instrument (100) as claimed in claim 1, wherein the attachment (300) comprises:
a. a body (310) sloping upwards from a first end (300a) to a second end (300b) of the attachment (300) and comprising a second slot (312) towards the second end (300b); and
b. a platform (320) comprising a projection (321) coupled with the second slot (312);
wherein in response to the impactor instrument (100) receiving an impact, the attachment (300) is configured to impact a poly component coupled to the platform (320).
12. The impactor instrument (100) as claimed in claim 1, wherein the attachment (400) comprises:
a. a body (413) extending between a first end (400a) and a second end (400b) of the attachment (400);
b. an edge (410) provided at the second end (400b) and configured to create a pathway for a tibial base component in response to the impactor instrument (100) receiving an impact.
13. The impactor instrument (100) as claimed in claim 1, wherein the attachment (500) comprises a surface (501) provided at a second end (500b) coupled to a liner, wherein (in response to the impactor instrument 100) receiving an impact, the attachment (500) is configured to impact the liner coupled to the surface (501).
14. The impactor instrument (100) as claimed in claim 1, wherein the attachment (600) comprises:
a. a body (610) sloping upwards from a first end (600a) and a second end (600b) of the attachment (500) and comprising;
i. a second slot (612) towards the second end (600b);
b. a platform (620) includes a projection (621) coupled to the second slot (612);
wherein in response to the impactor instrument (100) receiving an impact, the attachment (600) is configured to impact a tibial base plate coupled to the platform (620).
15. The impactor instrument (100) as claimed in claim 1, wherein the attachment (700) comprises a surface (701) provided at a second end (700b), wherein in response to the impactor instrument (100) receiving an impact, the attachment (700) is configured to impact a femoral component coupled to the surface (701).