# US 11,439,771 B2 · Needle protection device for a pre-filled syringe with staked needle, and syringe comprising such a device

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- Number: US 11,439,771 B2
- Document ID: US11439771B2
- Status: Granted
- Kind: B2
- Application number: 16/493,496
- Filed: 2018-03-16
- Published: 2020-08-13
- Granted: 2022-09-13
- Earliest claimed: 2017-03-17
- Assignees: Biocorp Production
- Applicants: Biocorp Production
- Inventors: Daniel Aneas
- Web page: https://patentgrep.com/patent/US11439771B2

## CPC

- A61M 5/3202: {Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; protectors for sharps A61B50/3001)}
- A61M 5/326: {Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user}
- A61M 5/3204: {Needle cap removers, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices}
- A61M 5/3257: {Semi-automatic sleeve extension, i.e. in which triggering of the sleeve extension requires a deliberate action by the user, e.g. manual release of spring-biased extension means}
- A61M 2005/312: {comprising sealing means, e.g. severable caps, to be removed prior to injection by, e.g. tearing or twisting}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

The invention relates to a needle protection device for a pre-filled syringe with staked needle. This device comprises a blocking mechanism, comprising means for fastening to a syringe body, a needle shield, into which the needle can be driven, and an after-use safety system comprising a sleeve defining a central axis along which it is movable and means for resiliently loading the sleeve in a forward position in which it is able to cover the needle. The sleeve comprises an outer tube and a coaxial inner tube that are manufactured in one piece by injection molding, while the outer tube is arranged so as to cooperate with the blocking mechanism, and the inner tube is detachable from the outer tube and axially connected in translation with the needle shield.

## Claims

### Claim 1

A needle protection device for a pre-filled syringe with staked needle, the device comprising:
a blocking mechanism, comprising means for fastening to a syringe body,
a needle shield, into which the needle can be driven,
an after-use safety system, comprising a sleeve defining a central axis along which it is movable and means for elastically loading the sleeve in a forward direction in which it is able to cover the needle,
wherein the sleeve comprises an outer tube and a coaxial inner tube that are manufactured in one piece by injection molding, and wherein the outer tube is arranged so as to cooperate with the blocking mechanism, while the inner tube is detachable from the outer tube and axially connected in translation with the needle shield,
wherein the needle shield is arranged with a radial play inside the inner tube of the sleeve, such that the inner tube can rotate freely around the needle shield,
wherein the needle shield comprises a collar, interposed axially between a distal end part of the blocking mechanism and a proximal end of the inner tube of the sleeve, and
wherein an axial play is arranged between the proximal end of the inner tube and the collar.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the outer tube and the inner tube are attached to one another by frangible bridges.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the frangible bridges are formed at a distal end of the outer tube.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the inner tube comprises a closed end.

### Claim 5 (depends on 1)

The device according to claim 1, wherein the inner tube has a minimum outer diameter strictly smaller than an outer diameter of the distal end part of the blocking mechanism.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the inner tube is opaque and the outer tube is transparent.

### Claim 7 (depends on 1)

The device according to claim 1, wherein the inner tube and the outer tube have different surface states.

### Claim 8 (depends on 1)

The device according to claim 1, wherein the inner tube comprises gripping fins.

### Claim 9 (depends on 1)

A prefilled syringe with staked needle, comprising a needle protection device according to claim 1 and a syringe body, wherein the needle protection device is mounted on the syringe body.