# US 2014/0194828 A1 · Safety device for an injection syringe

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- Number: US 2014/0194828 A1
- Document ID: US20140194828A1
- Status: Published application
- Kind: A1
- Application number: 14/148,115
- Filed: 2014-01-06
- Published: 2014-07-10
- Earliest claimed: 2013-01-07
- Assignees: Hoffman-La Roche Inc.
- Inventors: Mark Digby TEUCHER; Pascal DUGAND; Loïc SEBILEAU; Daniel PETER; Maxime GAILLOT; Jürg LINIGER
- Web page: https://patentgrep.com/patent/US20140194828A1

## CPC

- 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 5/31511: {Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence)}
- A61M 2005/3261: {triggered by radial deflection of the anchoring parts between sleeve and syringe barrel, e.g. spreading of sleeve retaining hooks having slanted surfaces by engagement with conically shaped collet of the piston rod during the last portion of the injection stroke of the plunger}
- 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 safety device for an injection syringe, the injection syringe including a body having an injection needle fitted thereon, the device including a plunger rod including a distal plunger part slidably movable in the body of the syringe, and a proximal triggering part, configured to trigger the displacement of a protection sheath, from an injection position, wherein the needle is uncovered, towards a safety position, wherein the needle is covered by the sheath. The proximal triggering part is able to move relative to the distal plunger part once the distal plunger part is at the distal end of its stroke, to trigger the displacement of the protection sheath.

## Claims

### Claim 1

Safety device for an injection syringe, the injection syringe comprising a body having an injection needle fitted thereon, wherein the device comprises a plunger rod including:
a distal plunger part slidably movable in the body of the syringe,
a proximal triggering part, configured to trigger the displacement of a protection sheath from an injection position, wherein the needle is uncovered, towards a safety position, wherein the needle is covered by the sheath,
wherein the proximal triggering part is able to move relative to the distal plunger part once the distal plunger part is at the distal end of its stroke in order to trigger the displacement of the protection sheath.

### Claim 2 (depends on 1)

Safety device according to claim 1, wherein the distal plunger part and the proximal triggering part are linked by deformable means, deformable under a force that is higher than the force required to move a piston in the syringe body when injecting the liquid contained in the syringe body.

### Claim 3 (depends on 2)

Safety device according to claim 2, wherein the deformable means comprise elastic means.

### Claim 4 (depends on 3)

Safety device according to claim 3, wherein the elastic means are integral with the piston.

### Claim 5 (depends on 3)

Safety according to claim 3, wherein the elastic means comprise an elastomeric material glued, soldered, snap-fitted or overmolded on the distal plunger part and/or the proximal triggering part.

### Claim 6 (depends on 3)

Safety device according to claim 3, wherein the elastic means is a spring.

### Claim 7 (depends on 6)

Safety device according to claim 6, wherein the distal plunger part and the proximal triggering part each form a seat for the spring.

### Claim 8 (depends on 7)

Safety device according to claim 7, wherein the distal plunger part and the proximal triggering part are snap-fastened to each other.

### Claim 9 (depends on 1)

Safety device according to claim 1, wherein the distal plunger part and the proximal triggering part each comprise complementary anti-rotational means.

### Claim 10 (depends on 9)

Safety device according to claim 9, wherein the complementary anti-rotational means comprise a lug cooperating with a groove.

### Claim 11 (depends on 1)

Assembly of the safety device according to claim 1 and of the injection syringe.