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:
MODULAR FEMORAL ASSEMBLY
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
[1] The present disclosure relates to prosthetic implants. More particularly, the present disclosure relates to a femoral assembly.
BACKGROUND OF INVENTION
[2] A human knee anatomy includes the knee joint that lies between the distal portion of the femur and the proximal portion of the tibia. The knee joint is surrounded with anterior, posterior, medial and lateral collateral ligaments. These ligaments function to support and stabilize the knee joint.
[3] Various conditions, such as, osteointegration, rheumatoid arthritis, fractures, ligament tears, infections, age and the like may lead to damaging various parts of the native knee in an individual. In such cases, a knee replacement surgery may be performed. The knee replacement surgery involves removing a part of or entire native knee and replacing it with a knee prosthesis (also known as a knee replacement system) which mimics structure and functions of the damaged portion of the native knee joint.
[4] A conventionally available knee replacement system includes a femoral component, a tibial component, a patellar component and extensions. The femoral component plays a crucial part in the knee replacement systems. Various types of femoral components, for example, cruciate retainers, posterior stabilizer, revision femoral components, are designed to treat various conditions of the patients Further, different sizes of such femoral components are required so that a femoral component of a desired size can be used according to the anatomy of a patient.
[5] Typically, a femoral component is manufactured as a single, integrated structure. Therefore, different types and sizes of femoral components are manufactured separately. This increases manufacturing complexity and associated costs. Further, during a knee replacement surgery, multiple femoral components are needed so that an optimal femoral component of a desired type and size can be chosen based upon the patient’s anatomy and medical condition. This requires extensive storage space on a surgical table, leading to additional inventory during a surgical procedure, increased set-up time, additional sterilization, etc. Consequently, the overall cost of the knee replacement procedure increases.
[6] Hence, there arises a need of a femoral assembly which overcomes the problems related to conventionally available femoral assemblies.
SUMMARY OF INVENTION
[7] 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.
[8] The present disclosure relates to an implant. In an embodiment, the implant includes a central component and a condyle component. The central component includes a platform. The central component further includes a wall disposed on each medial side of the platform and extending from the platform towards a distal end of the central component. The central component further includes a ledge extending outwards from each wall. Each ledge includes a first coupling structure. The condyle component is detachably coupled to the central component and includes two condyles. Each of the condyles includes a top face and a cut out portion provided on the top face towards the medial side of the top face. The cut-out portion is configured to receive the corresponding ledge. The cut-out portion includes a second coupling structure provided towards a lateral side of the cut-out portion. The second coupling structure is configured to mate with a corresponding first coupling structure. The second coupling structure is complementary to the first coupling structure.
BRIEF DESCRIPTION OF DRAWINGS
[9] The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the apportioned drawings. For the purpose of illustrating 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.
[10] Fig. 1 depicts a central component 110, according to an embodiment of the present disclosure.
[11] Fig. 2A depicts a cross-sectional view of the central component 110, according to an embodiment of the present disclosure.
[12] Fig. 2B depicts another cross-sectional view of the central component 110, according to an embodiment of the present disclosure.
[13] Fig. 3A depicts an exploded view of an implant 300, according to an embodiment of the present disclosure.
[14] Fig. 3B depicts an assembled view of the implant 300, according to an embodiment of the present disclosure.
[15] Fig. 4A depicts a perspective view of a condyle component 320, according to an embodiment of the present disclosure.
[16] Fig. 4B depicts another perspective view of the condyle component 320, according to an embodiment of the present disclosure.
[17] Fig. 4C depicts a cross-sectional view of the condyle component 320, according to an embodiment of the present disclosure.
[18] Fig. 5A depicts an exploded view of an implant 500, according to an embodiment of the present disclosure.
[19] Fig. 5B depicts an assembled view of the implant 500, according to an embodiment of the present disclosure.
[20] Fig. 6 depicts a perspective view of a condyle component 520, according to an embodiment of the present disclosure.
[21] Fig. 7A depicts a post 530, according to an embodiment of the present disclosure.
[22] Fig. 7B depicts a cross-sectional view of the post 530, according to an embodiment of the present disclosure.
[23] Fig. 8 depicts an exploded view of an implant 800, according to an embodiment of the present disclosure.
[24] Fig. 9 depicts a T-joint component 840, according to an embodiment of the present disclosure.
[25] Fig. 10 depicts a pin 850, according to an embodiment of the present disclosure.
[26] Fig. 11 depicts an assembled view of the implant 800, according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE DRAWINGS
[27] Prior to describing the invention 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.
[28] 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.
[29] 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.
[30] 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.
[31] The present disclosure relates to a femoral assembly (or implant) used in a knee prosthesis. In an embodiment, the implant includes a central component. The central component is designed such that the central component can be coupled with condyle components of different types (e.g., cruciate retaining condyle components, posterior stabilized condyle components and the like) and sizes. In other words, the central component functions as a universal component. During a knee replacement surgery, a condyle component of a desired type and size may be selected based upon the patient’s requirements and assembled with the central component to form a femoral component of the knee prosthesis. This enables a surgeon to personalize a femoral component according to a patient’s anatomy for optimal fit and function. Moreover, since a single central component is capable of coupling with a condyle component of any type or size, the overall inventory for the surgery is reduced. As a result, set-up time for the surgery is reduced. This increases the efficiency of the procedure and decreases the overall cost. Further, the proposed femoral assembly may include additional components, such as, a post, a T-joint component, a pin and the like. One or more of the additional components may be assembled with the central component as desired depending upon the surgical requirements. The proposed modular femoral assembly enables a surgeon to form a femoral component of different types (e.g., a primary femoral component (cruciate retaining or posterior stabilized), a revision femoral component, a hinge femoral component, etc.), thereby satisfying needs of multiple surgical scenarios, such as, a primary knee replacement surgery, a revision surgery and so on. Consequently, the proposed femoral assembly is highly adaptable to cater to diverse requirements of patients. The central component can also be coupled with the condyle components made of different materials, for example, titanium, cobalt chromium, ceramic, etc. Thus, the proposed femoral assembly offers a comprehensive solution for surgeons across diverse surgical scenarios, ensuring consistent and reliable surgical outcomes across a range of knee pathologies, ranging from degenerative joint disease to complex revision cases.
[32] Fig. 1 depicts an exemplary central component 110. The central component 110 has a proximal end 110a, a distal end 110b, an anterior end 110c and a posterior end 110d. The central component 110 includes a platform 110e. The platform 110e is provided with an aperture 110f. The aperture 110f may have a shape, such as, without limitation, oval, circular, hexagonal, square, etc. In an embodiment, the aperture 110f is circular. The aperture 110f is configured to receive a distal portion of a post for coupling with a femoral stem portion (explained later). The aperture 110f includes a third coupling structure 110f1 (shown in Fig. 2B) provided along an inner periphery of the aperture 110f. The third coupling structure 110f1 is used to couple the post with the central component (explained later). In an embodiment, the third coupling structure 110f1 is a groove. The central component 110 includes walls 110g with one wall 110g situated on each medial side of the platform 110e. Each of the walls 110g extends from the platform 110e towards the distal end 110b of the central component 110. Each wall 110g has an outer surface and an inner surface. The central component 110 includes a ledge 113 extending outwards from the outer surface of each wall 110g. In an embodiment, the ledges 113 extend from the anterior end 110c to the posterior end 110d. In an embodiment, each ledge 113 has a sloped edge at each of an anterior end and a posterior end of the ledge 113. The sloped edges slope upwards towards the proximal end 110a. In an embodiment, the ledge 113 includes a first coupling structure 113a (shown in Fig. 2A). In an embodiment, the first coupling structure 113a extends for the entire length of the ledge 113 (i.e., from the anterior end 110c to the posterior end 110d). In another embodiment, the first coupling structure 113a extends for a partial length of the ledge 113. The first coupling structure 113a may be a chamfer edge, a ridge, a slot, a groove, a projection, etc. In the depicted embodiment, the first coupling structure 113a is a chamfer slot. Though in the depicted embodiment, the ledges 113 are shown to have the same first coupling structure 113a, in an alternate embodiment, the ledges 113 may have different first coupling structures (for example, one ledge 113 may have a chamfer edge and the other ledge 113 may have a slot). The ledges 113 and the first coupling structures 113a are used to couple the central component 110 with a condyle component (explained later). The central component 110 is designed to be compatible with different condyle components to achieve secure attachment. Each of the walls 110g may be provided with a cutout 110i on the inner surface of the wall 110g towards the posterior end 110d. The cutouts 110i may have a shape, such as, without limitation circular, semi-circle, etc. In an embodiment, the cutouts 110i are semi-circular. The cut-outs 110i are blind cut-outs. The walls 110g defines an opening 110n towards the posterior end 110d of the central component 110. The cutouts 110i and the opening 110n are provided to accommodate a T-joint component and a pin (explained later).
[33] The central component 110 may be made of a material, such as, without limitation, titanium, cobalt chromium, stainless steel (e.g., SS316), ceramic, etc. In an embodiment, the central component 110 is made of titanium.
[34] The central component 110 of the present disclosure act as a universal attachment and can be coupled with condyle components of different materials, sizes and types. Consequently, the central component 110 may be used in a femoral component of various knee implants (or implant) used in different knee surgeries.
[35] Fig. 3A depicts an exploded view of an exemplary femoral assembly 300 (or implant 300). Fig. 3B depicts an assembled view of the implant 300. In an embodiment, the implant 300 is a femoral implant (or a femoral component) used in primary knee replacement surgeries. The implant 300 may be a trial implant or may be a final implant implanted into a patient’s body. The implant 300 includes the central component 110 and a condyle component 320. The condyle component 320 is detachably coupled to the central component 110.
[36] Figs. 4A – 4C depict various views of the condyle component 320, according to an embodiment. In an embodiment, the condyle component 320 is a cruciate retaining femoral condyle component. It is to be noted that the shape and dimensions of the condyle component 320 of the present disclosure may vary depending upon the patient anatomy. The condyle component 320 has a proximal end 320a, a distal end 320b, a posterior end 320d and an anterior end 320k. The condyle component 320 includes condyles 322. The condyles 322 may have a shape, such as, without limitation, C shaped, J shaped, etc. In an embodiment, the condyles 322 are C shaped. The condyles 322 have a convex outer surface configured to articulate with corresponding surfaces of the tibia or with corresponding surfaces of a tibial component of a knee prosthesis.
[37] Each condyle 322 has a top face 320c. The top face 320c includes a cut-out portion 320g. The cut-out portion 320g is situated towards a medial side of the top face 320c. The cut-out portion 320g is configured to receive a corresponding ledge 113 of the central component 110. The shape and dimensions of each cut-out portion 320g corresponds to the shape and dimensions of the corresponding ledge 113. The cut-out portion 320g includes a second coupling structure 320f provided towards a lateral side of the cut-out portion 320g. The second coupling structure 320f is configured to mate with a corresponding first coupling structure 113a of the central component 110. The second coupling structure 320f is complementary to the corresponding first coupling structure 113a. The second coupling structure 320f may be a chamfer edge, a ridge, a slot, a projection, a groove, etc. In the depicted embodiment, the second coupling structure 320f is a slot. Though in the depicted embodiment, the cut-out portions 320g are shown to have the same second coupling structures 320f, in an alternate embodiment, the cut-out portions 320g may have different second coupling structures (for example, one cut-out portion 320g may have a slot and the other cut-out portion 320g may have a ridge). A groove 320e may be provided on a lateral side of each condyle 322. The groove 320e may have a shape, such as, without limitation, square, rectangular, oval, etc. In an embodiment, the groove 320e is rectangular. The groove 320e is configured to engage with a corresponding portion of an instrument (e.g., an impactor, an extractor, etc.) and allows a user to grip the implant 300 during a medical procedure.
[38] The condyle component 320 may be made of a material, such as, without limitation, titanium, cobalt chromium, stainless steel (e.g., SS316), ceramic, etc. In an embodiment, the condyle component 320 is made of cobalt chromium.
[39] To assemble the implant 300 during a medical procedure, the central component 110 is disposed between the condyles 322 such that each ledge 113 aligns with the corresponding cut-out portion 320g. The central component 110 may then be pressed downward (e.g., using an impactor) such that the first coupling structure 113a of the ledge 113 mates with the corresponding second coupling structure 320f of the cut-out portion 320g. Further, a bottom face of the ledge 113 mates with a top face of the corresponding cut-out portion 320g, thereby coupling the central component 110 with the condyle component 320. The mating of respective first coupling structures 113a and second coupling structures 320f ensures secure locking between the central component 110 and the condyle component 320. In the depicted embodiment, the first coupling structure 113a and the corresponding second coupling structure 320f form an interference lock.
[40] Fig. 5A depicts an exploded view of another exemplary femoral assembly 500 (or implant 500). Fig 5B depicts an assembled view of the implant 500. According to an embodiment, the implant 500 includes the central component 110 and a condyle component 520. The condyle component 520 is detachably coupled to the central component 110. The implant 500 may optionally include a post 530. In an embodiment, the implant 500 (having the post 530) may be a femoral implant (or a femoral component) used in revision knee surgeries. The components of implant 500 are designed to overcome challenges such as bone loss or instability during primary and revision surgeries of knee joint. The implant 500 offers versatility and adaptability during revision surgery of the knee joint. In another embodiment, implant 500 (without the post 530) may be a femoral implant (or a femoral component) used in posterior stabilized primary knee surgeries, when there is a need to stabilize the knee joint on the posterior side due to the broken posterior cruciate ligament and prevent anterior translation of the femur on the tibia, while allowing femoral rollback during flexion. The implant 500 may be a trial implant or may be a final implant implanted into a patient’s body.
[41] In an embodiment, the condyle component 520 is a posterior stabilized condyle component used in revision surgeries. The shape and dimensions of the condyle component 520 may vary depending upon the patient anatomy. Referring to Fig. 6, the condyle component 520 of the implant 500 has a proximal end 520a, a distal end 520b, a posterior end 520d and an anterior end 520k. The condyle component 520 include condyles 522. The condyles 522 may have a shape such as without limitation C shaped, J shaped, etc. In an embodiment, the condyles 522 are C shaped. The condyles 522 of the condyle component 520 defines a convex articular outer surface. The condyles 522 of the condyle component 520 articulates with the corresponding surfaces of the tibia or with corresponding surfaces of a tibial component of a knee prosthesis.
[42] The condyle component 520 includes a bar 520e provided between the condyles 522. The bar 520e may have a tubular structure. The bar 520e is situated towards the posterior end 520d of the implant 500. The bar 520e is provided to stabilize the knee joint on the posterior side in case of a broken posterior cruciate ligament. The bar 520e also prevents the anterior translation of the femur on the tibia, while allowing femoral rollback during flexion. Each condyle 522 has a top face 520c. The top face 520c includes a cutout portion 520g. The cutout portion 520g is situated towards a medial side of the top face 520c. The cut-out portion 520g receives a corresponding ledge 113 of the central component 110. The shape and dimensions of each cut-out portion 520g corresponds to the shape and dimensions of the corresponding ledge 113. The cutout portion 520g includes a second coupling structure 520f provided towards a lateral side of the cut-out portion 520g. The second coupling structure 520f is configured to mate with a corresponding first coupling structure 113a of the central component 110. The second coupling structure 520f is complementary to the corresponding first coupling structure 113a. The second coupling structure 520f may be a chamfer edge, ridge, slot, etc. In the depicted embodiment, the second coupling structure 520f is a slot. Though in the depicted embodiment, the cut-out portions 520g are shown to have the same second coupling structures 520g, in an alternate embodiment, the cut-out portions 520g may have different second coupling structures (for example, one cut-out portion 520g may have a slot and the other cut-out portion 520g may have a ridge). A groove 520h may be provided on a lateral side of each of the condyles 522. The groove 520h may have a shape such as without limitation, square, rectangular, oval, etc. In an embodiment, the groove 520h has a rectangular shape. The groove 520h is configured to engage with a corresponding portion of an instrument (e.g., an impactor, an extractor, etc.) and allows a user to grip the implant 500 during a medical procedure.
[43] The condyle component 520 may be made of a material, such as, without limitation, titanium, cobalt chromium, stainless steel (e.g., SS316), ceramic, etc. In an embodiment, the condyle component 520 is made of cobalt chromium.
[44] The post 530 is used to couple with a femoral stem extension (not shown) of a knee implant. Referring to Figs. 7A and 7B, the post 530 has a proximal end 530a and a distal end 530b. The post 530 has a tubular structure. The post 530 includes a cavity 530d provided centrally. The cavity 530d is configured to receive a portion of a femoral stem extension. Inner surface 531 of the cavity 530d is tapered such that a diameter of the inner surface 531 decreases from the proximal end 530a towards the distal end 530b. The tapering ensures a secure attachment of the post 530 with the femoral stem extension. The post 530 is provided with a hole 530c situated on the periphery towards the distal end 530b of the post 530. The hole 530c may have a shape, such as, without limitation circular, oval, etc. In an embodiment, the hole 530c is circular. The hole 530c is configured to receive a fastener (not shown), e.g., a Grub screw, to couple the post 530 with the femoral stem extension. The post 530 includes a plurality of indicators 530e provided on an outer surface of the post 530. In an embodiment, the plurality of indicators 530e are situated towards the proximal end 530a. Each of the plurality of indicators 530e represents a corresponding offset between the post 530 and the femoral stem extension. To couple the femoral stem extension with the post 530 at a desired offset, the surgeon may align the femoral stem extension with an indicator 530e corresponding to the desired offset. Thus, the plurality of indicators 530e acts as a visual guide and helps the surgeon to adjust the offset as needed based on the anatomy of the patient. The post 530 is detachably coupled with the central component 110 using a technique, such as, press-fit, snap-fit, etc. In an embodiment, the post 530 is coupled with the central component 110 using a snap-fit technique. The post 530 includes a fourth coupling structure 530f provided along an outer periphery of the post 530 at the distal end 530b. The fourth coupling structure 530f is configured to mate with the third coupling structure 110f1 of the central component 100. The fourth coupling structure 530f is complementary to the third coupling structure 110f1. In an embodiment, the fourth coupling structure 530f is a rim having a slanted edge, though in another embodiment, the rim may have a straight edge. It should be appreciated that the third coupling structure 110f1 of the central component 110 and the fourth coupling structure 530f of the post 530 described herein are merely exemplary and the third coupling structure 110f1 and the fourth coupling structure 530f may include any complementary coupling structures. In an embodiment, the post 530 may be oblique by a pre-defined angle. The pre-defined angle may be designed based upon the patient’s anatomy and requirements. The pre-defined angle may range between 0 and 10. This allows the post 530 to be coupled with the aperture 110f at a desired angle, thereby achieving both the right and left sides of femoral fixation using the same post 530. This helps in optimizing the mechanical function of the native joint.
[45] The post 530 may be made of a material, such as, without limitation, titanium, cobalt chromium, stainless steel (e.g., SS316), ceramic, etc. In an embodiment, the post 530 is made of cobalt chromium.
[46] To assemble the implant 500, the central component 110 and the condyle component 520 are coupled with each other in a similar manner as described earlier. Each of the first coupling structures 113a mates with the corresponding second coupling structure 520f, thereby securely coupling the central component 110 with the condyle component 520. The distal end 530b of the post 530 is inserted into the aperture 110f. The fourth coupling structure 530f mates and locks with the third coupling structure 110f1 of the central component 110, thereby securely coupling the post 530 with the central component 110. A distal portion of a femoral stem extension is inserted into the post 530 from the proximal end 530a and mates with the inner surface of the cavity 530d. A fastener is inserted through the hole 530c to couple the post 530 and the femoral stem extension with each other.
[47] Fig. 8 depicts an exploded view of another exemplary femoral assembly 800 (or implant 800). In an embodiment, the implant 800 is a hinge femoral implant (or a femoral component) used in knee replacement surgeries. The implant 800 mimics the hinge joint of the native knee and provides specialized support and stability post-surgery. The implant 800 may be a trial implant or may be a final implant implanted into a patient’s body. The implant 800 facilitates a controlled movement and enhances the stability in cases where there is a severe ligamentous laxity or deformity.
[48] The implant 800 includes the central component 110, a condyle component 820, a post 830, a T-joint component 840 and a pin 850. The structure, functions and material of the condyle component 820 and the post 830 of the implant 800 can be referred from the condyle component 320 and the post 530, respectively and hence, is not repeated for the sake of brevity.
[49] Referring to Fig. 9, the T-joint component 840 has a first portion 840a situated towards a posterior end of the T-joint component 840 and a second portion 840b sloping from the first portion 840a towards an anterior end of the T-joint component 840. The T-joint component 840 is detachably coupled to the central component 110. The first portion 840a includes an aperture 840f. The aperture 840f extends from a lateral face of the first portion 840a to a medial face of the first portion 840a. The aperture 840f may have a shape, such as, without limitation, circular, oval, etc. In an embodiment, the aperture 840f is circular. The aperture 840f is configured to receive the pin 850. The shape and dimensions of the aperture 840f correspond to the shape and dimensions of the pin 850. A hole 840e is provided on a top surface of the second portion 840b. The hole 840e may have a shape, such as, without limitation, circular, oval, etc. In an embodiment, the hole 840e is oval. The hole 840e is provided to engage and lock with a shaft of a tibial base plate (not shown) to couple the implant 800 with a tibial component (not shown).
[50] The T-joint component 840 may be made of a material, such as, without limitation, titanium, cobalt chromium, stainless steel (e.g., SS316), ceramic, etc. In an embodiment, the T-joint component 840 is made of cobalt chromium.
[51] Referring to Fig. 10, The pin 850 has a cylindrical body. The pin 850 is removably coupled to the T-joint component 840. The pin 850 is configured to fit within the aperture 840f. A face 850aof the pin 850 mates with an inner surface of the aperture 840f. Each side face 850bof the pin 850 mates with a corresponding face of the cutout 110i of the central component 110. The T-joint component 840 and the pin 850 mimic the hinge joint of the native knee. The pin 850 may be made of a material, such as, without limitation, titanium, cobalt chromium, stainless steel (e.g., SS316), ceramic, etc. In an embodiment, the pin 850 is made of cobalt chromium.
[52] The central component 110 and the condyle component 820 of the implant 800 are assembled in a similar manner as explained previously. Further, the post 830 and the central component 110 are coupled in a similar manner as described earlier. The pin 850 is disposed within the aperture 840f of the T-joint component 840. The T-joint component 840 is then assembled with the central component 110 such that the first portion 840a is disposed within the opening 110n of the central component and the second portion 840b is disposed below central component 110. The aperture 840f aligns with the cut-outs 110i. The medial and the lateral face of the first portion 840a mates with an inner face of the corresponding cut-out 110i. Further, each side face 850b of the pin 850 mates with the inner face of the corresponding cut-out 110i.
[53] As can be seen, teachings of the present disclosure enable a surgeon to assemble one or more modular components to form a femoral assembly (or implant) in various configurations as desired for different types of knee surgeries. Further, since the proposed central component can be assembled with condyle components of different materials, types and sizes, the implant can be customized depending on the requirements of an individual patient. The components are designed such that they are compatible with each other and can be easily assembled together. This decreases time required for the surgery. This adaptability and compatibility of the proposed modular femoral assembly or implants ensures consistency and reliability in surgical outcomes depending upon the diverse needs of patients undergoing knee surgery. Further, the components are provided with various coupling structures to ensure secure locking, thereby minimizing chances of dislocation and improving patient outcome.
[54] 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 implant (300, 500, 800) comprising:
a. a central component (110) comprising:
i. a platform (110e);
ii. a wall (110g) disposed on each medial side of the platform (110e) and extending from the platform (110e) towards a distal end (110b) of the central component (110); and
iii. a ledge (113) extending outward from each wall (110g), each ledge (113) comprising a first coupling structure (113a); and
b. a condyle component (320, 520, 820) detachably coupled with the central component (110), the condyle component (320, 520, 820) comprising two condyles (322, 522), each condyle (322, 522) comprising:
i. a top face (320c, 520c); and
ii. a cut-out portion (320g, 520g) provided on the top face (320c, 520c) towards a medial side of the top face (320c, 520c) and configured to receive a corresponding ledge (113), the cut-out portion (320g, 520g) comprising a second coupling structure (320f, 520f) provided towards a lateral side of the cut-out portion (320g, 520g), the second coupling structure (320f, 520f) is configured to mate with a corresponding first coupling structure (113a) and is complementary to the first coupling structure (113a).
2. The implant (300, 500, 800) as claimed in claim 1, wherein the first coupling structure (113a) comprises a chamfer edge, a ridge, a groove, a slot, or a projection.
3. The implant (300, 500, 800) as claimed in claim 1, wherein the second coupling structure (320f) comprises a chamfer edge, a ridge, a slot, a groove, or a projection.
4. The implant (300, 500, 800) as claimed in claim 1, wherein the first coupling structure (113a) extends for an entire length of the ledge (113).
5. The implant (300, 500, 800) as claimed in claim 1, wherein each ledge (113) has a sloped edge at each of an anterior end and a posterior end of the ledge (113), the sloped edges sloping upwards.
6. The implant (300, 500, 800) as claimed in claim 1, wherein the condyle component (320, 520, 820) comprises a cruciate retaining condyle component (320, 820), or a posterior stabilized condyle component (520).
7. The implant (300, 500, 800) as claimed in claim 1, wherein the implant (500, 800) comprises a post (530, 830) detachably coupled to the central component (110), the post (530, 830) comprising:
a. a cavity (530d) configured to receive a portion of a femoral stem extension; and
b. a fourth coupling structure (530f) provided along an outer periphery of the post (530) at a distal end (530b) of the post (530);
c. wherein the central component (110) comprises an aperture (110f) provided on the platform (110e) and configured to receive a distal portion of the post (530, 830), the aperture (110f) comprising a third coupling structure (110f1) provided along an inner periphery of the aperture (110f), the third coupling structure (110f1) is complementary to the fourth coupling structure (530f) and is configured to mate with the fourth coupling structure (530f) of the post (530).
8. The implant (300, 500, 800) as claimed in claim 7, wherein the third coupling structure (110f1) comprises a groove and the fourth coupling structure (530f) comprises a rim.
9. The implant (300, 500, 800) as claimed in claim 1, wherein the walls (110g) of the central component (110) define an opening (110n) towards a posterior end (110d) of the central component (110), wherein a cut-out (110i) is provided on an inner surface of each wall (110g) towards the posterior end (110d) of the central component (110), wherein the implant (800) comprises:
a. a T-joint component (840) detachably coupled to the central component (110), the T-joint component (840) comprising:
i. a first portion (840a) situated towards a posterior end of the T-joint component (840) and configured to reside within the opening (110n) of the central component (110), the first portion (840a) having an aperture (840f), wherein a lateral face and a medial face of the T-joint component (840) are configured to mate with an inner surface of a corresponding cut-out (110i) of the central component (110); and
ii. a second portion (840b) sloping from the first portion (840a) towards an anterior end of the T-joint component (840); and
b. a pin (850) removably coupled to the T-joint component (840) and configured to reside within the aperture (840f) of the T-joint component (840), the pin (850) comprising side faces (850b), each side face (850b) configured to mate with the inner surface of the corresponding cut-out (110i) of the central component (110).