Retractable Syringe


Updated about 2 years ago

Abstract

The present invention deals with a simple retractable syringe comprising of of a barrel having a needle mount with a needle placed within the distal end of the barrel in a sealingly slidable manner.. The needle mount is made up of a flexible and deformable material with a hollow cylindrical base structure. A plunger is having an inverted cone shape tip is slidably disposed within the syringe barrel The cone shape tip of the plunger can tightly engage with the hollow cylindrical base structure of the needle mount on contact with slight pressure-for enabling retraction of the needle mount with the attached needle into the barrel after the injection process is completed.

Information

Application ID 1940/MUM/2010
Invention Field MECHANICAL ENGINEERING
Date of Application 2010-07-06
Publication Number 32/2012

Applicants

Name Address Country Nationality
INDALIA MEDICAL DEVICES PRIVATE LIMITED KARE HOUSE, 2ND FLOOR NEXT TO NANUTEL HOTEL, MARGAO-GOA 403601 India India

Inventors

Name Address Country Nationality
JOSE OLAVO COTTA HOUSE NO.762. DANDEVADDO CHINCHINIM, SALCETE, GOA-403715 India India

Specification

FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
&
THE PATENTS RULES, 2003 PROVISIONAL/COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION.: RETRACTABLE SYRINGE
2. APPLICANT(S)
Name Nationality
INDALIA MEDICAL DEVICES PVT LTD INDIAN CO.
Address:
KARE HOUSE, 2 ND FLOOR NEXT TO NANUTEL HOTEL MARGAO-GOA 403601
3. PREAMBLE TO THE DESCRIPTION
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed
4 DESCRIPTION:( Description shall start from the next page )
5..CLAIMS (not applicable for provisional specification. Claims should start with the preamble — "I/We claim" on separate page)
6. DATE AND SIGNATURE (to be given at the end of last page of specification)
7. ABSTRACT OF THE INVENTION (to be given along with complete specification on separate page)

RETRACTABLE SYRINGE
FIELD OF THE INVENTION
The present invention relates to single use and safe syringe and more particularly a retractable syringe wherein the needle is safely retracted within the barrel to prevent the syringe from being re-used .
BACKGROUND OF THE INVENTION:
Numerous methods and agents are being used world over to prevent infective diseases, but, many a times the source of infection could be the improper medical treatment itself. This was the case in an infamous schistosomiasis campaign in Egypt, when the reuse of syringes led to a doubling of the hepatitis C rate; in Russia and Romania, many children were infected with HIV as a result of the use of contaminated syringes and needle. In recent years, the government of Kazakhstan and Kyrgystan have discovered respectively ,more than 140 and 70 children were infected with HIV through hospital procedures -mostly through reused ,unsteri1e instruments. In the early2009 there was an outbreak of Hepatitis B in Gujarat; over 125 people were infected and many people died. The re use of the contaminated syringes was believed to be the cause of this epidemic.
There is an alarming increase of infectious diseases due to multiple uses or accidental needle stick injuries caused by hypodermic injection systems. For instance ,nearly 5.6 million health care workers in the United States suffer as many as 800,000 sharps injuries -mostly with needlesticks each year. The WHO estimates that two million needlestick injuries occur among health workers worldwide each year. Hence, preventing accidental injury and infection from used hypodermic needles has attracted considerable interest in recent years. In order to minimize the risk of needle stick injuries , retractable syringes have been developed which enable retraction of the

needle into the barrel of the syringe following use and prior to disposal. Retraction and retention of the possibly contaminated needle into the barrel thus protectively isolates the needle and keeps it out of further human contact.
UNICEF, and WHO since 1999 have implemented and encouraged a policy of using only auto-disable syringes, bundled with safe-disposal boxes, for immunization campaigns. These syringes disable themselves so that they no longer function after one injection - there is a physical barrier to their reuse
US patent 4,596,561 describes and claims a non-reusable syringe comprising a tamper -proof packaging which insures that the proper medication is contained in the barrel ,free of any contaminant.
US patent Pub.No.US2004/0186428Al deals with an auto-destructible syringe comprising a syringe barrel having an inner wall ,a proximal end and a distal end; a plunger slidably disposed within the syringe barrel: stopper means on the inner wall of the syringe barrel for preventing the syringe plunger from moving towards the distal end; grooves on the plunger alignable with the stopper means by axially rotating the plunger relative to the barrel: and cutting means connected to the plunger. When the stopper means are aligned with the grooves ,the plunger can move towards the distal end of the syringe barrel .The cutting means cut the barrel when the plunger moves towards the distal end of the syringe barrel perforating the syringe barrel and preventing subsequent use of the syringe.
US patent No.5,084,017 deal with a single use ,hypodermic syringe which disables itself during its initial application there by preventing any subsequent use of the syringe. The working parts of the invention are designed to separate automatically when the syringe is oriented into the solution dispensing mode. These separated parts prevent subsequent aspiration of solutions into the syringe thereby rendering the syringe inoperable and unusable after its initial use.

US patent No.7,090,657 B2 describes an auto-disable safety syringe including a needle, needle seat, a plunger, and a barrel. A cover of a needle seat formed in the needle seat is provided with a splined hole having teeth and grooves. The needle seat has a ring block and an outer wall with splined teeth capable of passing through the grooves. A locking groove is formed in an cavity of the ring block and a locking head is formed on a connecting head to form a locking mechanism. Spiral grooves on the inner cavity engage with protrusions on the connecting head. When the locking head and the locking groove are interlocked and the plunger is retracted ,the needle seat and the needle are retracted inside the barrel together.
US Patent No.5820605 describes a retractable syringe which includes a barrel ,one end of which comprises a mounting collar A needle carrier is releasably mounted within the collar and releasably supports a needle cartridge. A sheath attaches at one end of the cartridge and at the other end of the collar. A plunger is telescoped into the barrel and includes a piston sealingly engaging the barrel. The piston includes a latch for engaging the carrier and releasing it from the collar. The piston and the carrier also include an anti -remount mechanism preventing the carrier from being reengaged into the collar. The plunger further includes surfaces to displace fluid as the piston is forced towards the proximal end of the barrel to displace fluid to reduce squirt. A cap is also provide initially seal of the proximal end of the barrel and after usage to form a seal by engaging teeth within the proximal end of the barrel
However, some of these syringes which retract the needle into the barrel of the syringe have required inconvenient locking or disengagement steps and multiple components to release the needle from its injecting position so as to allow it to be withdrawn into the barrel. Because of the complexities of the retracting mechanism and the technology involved the retractable syringes tend to become very costly as compared to conventional syringes .
There is a need to simplify the single -use syringes and other safety equipment in order to make the product competitively priced and affordable for the masses particularly when it is intended for use in developing countries. But this has to be done, of course, without compromising the efficiency of such retractable syringes.

OBJECT AND SUMMARY OF THE INVENTION:
It is an object of the present invention to improve some of the shortcomings evident in the single-use (retractable ) syringes described above and provide a simple retractable syringe , in which the needle mount with the needle is automatically engaged by the plunger for safe retraction into the barrel.
Another object of present invention is provide a retractable syringe with minimum components for ease in manufacturing.
Yet another object is to provide a retractable syringe which is cost-effective and suitable for mass use.
The above objectives of the present invention is achieved by providing a syringe comprising a barrel, a plunger operable within the barrel and a needle mount having a deformable securing portion which includes the surface of the needle mount in contact with the barrel to disengageably retain the needle mount at one end of the barrel. The mechanism for this engagement is mechanical as well as adhesive force between the barrel and needle mount. The securing portion of the needle mount not in contact with the barrel designed to be a first element of snap lock engaging means which cooperates with a second element of the snap lock engaging means at the tip of the plunger, The syringe further comprising means on the plunger to deform the securing portion on the needle mount as it approaches the needle mount thereby to disengage the lock engagement of the needle mount with the barrel. The snap lock between the plunger tip and the cooperable means on the needle mount and cooperable means on the plunger and on the needle mount whereby the plunger is capable of engaging the disengaged needle mount for withdrawal of the needle mount into the barrel when the plunger or a portion thereof engaged with the needle mount is displaced away from said one end of the barrel. The automatic disengagement of the needle mount securing portion from the barrel by the plunger as the syringe is emptied is particularly convenient as no additional operations need be performed to ensure such disengagement of the needle mount.

The snap lock engagement between the needle mount securing means and the barrel is advantageously configured to avoid the needle mount becoming inadvertently disengaged from the barrel even when the needle is inserted into comparatively unyielding objects.
Most advantageously, the first and second elements of the snap lock engaging means have cooperating surfaces oriented to prevent disengagement unless the securing means is actively deformed by the plunger.
BRIEF DESCRIPTION OF THE DRAWINGS
The objectives, shape, structure,characteristics and effects of the present invention will become apparent by the detailed description together with the accompanying drawings as follows:
Fig 1 is the view of the Syringe assembly as supplied to the doctor, (before use )
Fig 2. shows the plunger of the Syringe pulled to draw the solution.
Fig 3 shows the position of the Syringe when the solution is injected.
Fig 4 is the view of the Syringe at the end of the intended use showing the retraction mechanism engaged.
Fig 5 is the view of the Syringe with the needle holder(needle mount assembly) and the needle retracted into the barrel.
Fig 6 is the view of the Syringe with the plunger broken and the needle safely trapped in to the barrel.
Fig 7 is the view of the Syringe components shown separately
Fig .8 is the view of the Syringe components when assembled.
Fig. 9 is the individual view of 1) Plunger 2) Needle holder with needle 3)Barrel

DETAILED DESCRITION OF THE PRESENT INVENTION
The present invention is a syringe which is composed of three components.
A barrel;
A plunger operable within the barrel;
A needle mount
The barrel (No ]). is preferably made of polypropylene.
The top end (distal part ie. away from the users hand) of the barrel (No 2) is the narrowest part which is intended to support the needle mount and make a tight joint with the needle mount. The barrel is modified to support the end of the needle mount partly due to physical measurements and partly by adhesion between the two surfaces snuggly to make a water tight seal. The barrel is modified to stop the needle mount from deforming during the norma] pressure exerted during syringe use. The barrel preferably has a means which is either a radial projection or a slight constriction on wall of the barrel - to stop premature engagement of the retracting mechanism at the needle end of the barrel
The constrictions (No 3) on the wall of this part of the barrel are designed to prevent any movement of the needle mount during insertion of the needle into the vial for the withdrawal of the solution and injection of the solution in the skin.
The shoulder of the barrel (No 4) is the part which helps to keep the needle mount in place and prevents it from sliding out of the barrel during whole operation. The needle mount is fitted with a needle during the manufacturing process. This fitting is preferentially carried out by gluing and can alternatively be performed by any other comparable method
The remainder of the barrel is essentially cylindrical (No 5). The flaps at the end of the barrel (No 6) which are intended for use as fingers support have foldable flaps (No 7) which are flappable and are clipped together during the assembly process into push rod

retainers (No 8). They serve the purpose of preventing the withdrawal of the retracted plunger with the needle mount with the needle from exiting the barrel, and the openings in the folding flanges( in cross shape) ensure the movement of the plunger within the barrel- unidirectional.
The plunger (No 9) preferably also made of propylene has a substantially cylindrical head with truncated tip (No 10) The inverted cone shaped projection of the plunger at the end is designed to engage the needle mount irreversibly and is intended to effect retraction of the needle into the barrel by neutralizing the adhesion and mechanical forces which attach the needle mount to the barrel.. The head of the plunger extends into a circular disc (No 11) which is intended to provide a tight seal with the barrel during the intended use of the syringe. Below the disc, the plunger continues as a cross shaped in section (No 12) having a narrow section which is breaking point (No l3). The plunger continues downwards and ends into a circular disc (No 14) which is the thumb rest when the syringe is used.
The needle mount (No l5) is made of a flexible material such as thermoplastic rubber intended to provide a water tight seal against the barrel wall during the withdrawal and administration of the injectable. The shape is as shown and has a central cavity (No 16) at the lower end of the part intended to engage the tip of the plunger during retraction of needle into the barrel at the end of the intended use of the syringe..
The upper end of the needle mount has a near cylindrical projection (No 17) where the needle (No 18) is glued into.
Though an embodiment of the present invention has been shown and described ,it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles, spirit and scope of this invention .
The syringe of the present invention can protect both the medical staff and the patients-by avoiding cross contamination and preventing the used needle from pricking and scratching .

CLAIMS
We Claim:
1. A retractable syringe comprising :
i)a syringe barrel having a proximal and a distal end which is the end away from the users hand and the said distal end having a narrow opening ii)a needle mount made up of flexible material and having a narrow cylindrical projection attached to a short and broad hollow cylindrical base , with a needle attached to the narrow cylindrical projection in such a way that the end of bore of the needle opens to the hollow cylindrical base and the said needle mount placed within the distal end of the barrel in a sealingly slidable manner with the needle protruding out of the opening of the distal end of the barrel and iii) a plunger slidably disposed within the syringe barrel having an inverted cone shape tip which can tightly engage with the hollow cylindrical base structure of the needle mount on contact with slight pressure - for enabling retraction of the needle mount after the injection process is completed.
2. The retractable syringe according to claim 1 wherein the flexible material of the needle mount is selected from latex, PVC, and thermoplastic rubber.
3,The retractable syringe according to claim 2 wherein the flexible material of the needle mount is thermoplastic rubber
4. The retractable syringe according to claim 1 to 3 wherein the plunger is made up of propylene types of plastic preferably ploypropylene.

5 The retractable syringe according to any of the above claims wherein the attachment of the needle to the needle mount is with the help of a glue.
6. The retractable syringe according to any of the preceding claims further comprises of foldable flaps at the proximal end of the barref clipped together to provide a cross shaped opening
7. The retractable syringe according to claim 1 wherein the plunger is non-cylindrical having 'cross' shape in section.
8.The retractable syringe according to claim 7 wherein the plunger has a narrow section to act as a breaking point preferably just below the circular disc.
9. The retractable syringe according to claim 7 or claim 8 wherein the head of the plunger extends into a circular disc.
lO.The retractable syringe according to any of the preceding claims wherein the plunger and the barrel are coated with a lubricant
1 l.The retractable syringe according to claim 1 wherein the barrel further comprises of a means to stop premature engagement of the conical tip of the plunger with the cylindrical base of the needle mount.
12.The retractable syringe according to claim 11 wherein the means to stop the premature engagement is a radial projection or a slight narrowing of the barrel near the base of the needle mount to offer some resistance to the plunger.

Documents

Name Date
1940-MUM-2010-ABSTRACT(9-2-2011).pdf 2018-08-10
abstract1.jpg 2018-08-10
1940-mum-2010-form 5.pdf 2018-08-10
1940-MUM-2010-FORM 5(9-2-2011).pdf 2018-08-10
1940-mum-2010-form 3.pdf 2018-08-10
1940-mum-2010-form 2(title page).pdf 2018-08-10
1940-mum-2010-form 2.pdf 2018-08-10
1940-MUM-2010-FORM 2(TITLE PAGE)-(9-2-2011).pdf 2018-08-10
1940-MUM-2010-FORM 18(11-3-2013).pdf 2018-08-10
1940-mum-2010-form 2(9-2-2011).pdf 2018-08-10
1940-mum-2010-form 1.pdf 2018-08-10
1940-mum-2010-drawing.pdf 2018-08-10
1940-MUM-2010-DRAWING(9-2-2011).pdf 2018-08-10
1940-mum-2010-description(provisional).pdf 2018-08-10
1940-mum-2010-correspondence.pdf 2018-08-10
1940-MUM-2010-CORRESPONDENCE(9-2-2011).pdf 2018-08-10
1940-MUM-2010-DESCRIPTION(COMPLETE)-(9-2-2011).pdf 2018-08-10
1940-MUM-2010-CLAIMS(9-2-2011).pdf 2018-08-10
1940-MUM-2010-FER.pdf 2018-11-13
1940-MUM-2010-Abstract-250419.pdf 2019-04-26
1940-MUM-2010-Claims-250419.pdf 2019-04-26
1940-MUM-2010-Examination Report Reply Recieved-250419.pdf 2019-04-26
1940-MUM-2010-Amended Pages Of Specification-250419.pdf 2019-04-26
1940-MUM-2010-Written submissions and relevant documents [30-03-2021(online)].pdf 2021-03-30
1940-MUM-2010-FORM-26 [06-03-2021(online)].pdf 2021-03-06
1940-MUM-2010-FORM 3 [30-03-2021(online)].pdf 2021-03-30
1940-MUM-2010-IntimationOfGrant13-07-2021.pdf 2021-07-13
1940-MUM-2010-US(14)-HearingNotice-(HearingDate-15-03-2021).pdf 2021-10-03
1940-MUM-2010-PatentCertificate13-07-2021.pdf 2021-07-13
1940-MUM-2010-Claims-240321.pdf 2021-10-03
1940-MUM-2010-Reply to Hearing-240321.pdf 2021-10-03
1940-MUM-2010-Form 3-240321.pdf 2021-10-03
abstract1.jpg 2018-08-10
1940-mum-2010-form 5.pdf 2018-08-10
1940-MUM-2010-FORM 5(9-2-2011).pdf 2018-08-10
1940-mum-2010-form 3.pdf 2018-08-10
1940-MUM-2010-FORM 2(TITLE PAGE)-(9-2-2011).pdf 2018-08-10
1940-mum-2010-form 2(title page).pdf 2018-08-10
1940-MUM-2010-DESCRIPTION(COMPLETE)-(9-2-2011).pdf 2018-08-10
1940-mum-2010-form 2.pdf 2018-08-10
1940-mum-2010-form 1.pdf 2018-08-10
1940-MUM-2010-FORM 18(11-3-2013).pdf 2018-08-10
1940-MUM-2010-DRAWING(9-2-2011).pdf 2018-08-10
1940-mum-2010-form 2(9-2-2011).pdf 2018-08-10
1940-MUM-2010-ABSTRACT(9-2-2011).pdf 2018-08-10
1940-MUM-2010-CORRESPONDENCE(9-2-2011).pdf 2018-08-10
1940-MUM-2010-CLAIMS(9-2-2011).pdf 2018-08-10
1940-mum-2010-description(provisional).pdf 2018-08-10
1940-MUM-2010-Claims-250419.pdf 2019-04-26
1940-mum-2010-drawing.pdf 2018-08-10
1940-MUM-2010-Abstract-250419.pdf 2019-04-26
1940-MUM-2010-FER.pdf 2018-11-13
1940-MUM-2010-Amended Pages Of Specification-250419.pdf 2019-04-26
1940-MUM-2010-Examination Report Reply Recieved-250419.pdf 2019-04-26
1940-MUM-2010-Reply to Hearing-240321.pdf 2021-10-03
1940-MUM-2010-FORM-26 [06-03-2021(online)].pdf 2021-03-06
1940-MUM-2010-Written submissions and relevant documents [30-03-2021(online)].pdf 2021-03-30
1940-MUM-2010-FORM 3 [30-03-2021(online)].pdf 2021-03-30
1940-MUM-2010-Form 3-240321.pdf 2021-10-03
1940-MUM-2010-Claims-240321.pdf 2021-10-03
1940-MUM-2010-US(14)-HearingNotice-(HearingDate-15-03-2021).pdf 2021-10-03
371877-Correspondence (Renewal)-300622.pdf 2022-07-01
1940-MUM-2010-IntimationOfGrant13-07-2021.pdf 2021-07-13
1940-MUM-2010-PatentCertificate13-07-2021.pdf 2021-07-13
1940-mum-2010-correspondence.pdf 2018-08-10

Orders

Applicant Section Controller Decision Date URL