Injection set and injection assistance device

Patent metadata

Field	Value
Publication number	US-9579471-B2
Application number	US-201414221502-A
Country	US
Kind code	B2
Filing date	Mar 21, 2014
Priority date	Apr 20, 2005
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present invention relates to an injection assistance device including a body with a needle, grasping arrangement and first elastic return arrangement to dampen limited movement of the grasping arrangement, in at least one of the two directions, respectively distal or proximal, during an injection phase, and to maintain the body in its insertion position and the needle at a constant insertion length during the injection step, when the user increases, respectively releases, a distal pressure on the grasping arrangement. The invention also relates to an injection set including an injection device and the assistance device.

First claim

The invention claimed is:

1. Injection assistance device for an injection device for injecting a product into an injection site, the injection assistance device comprising at least one hollow body intended to receive a product that is to be injected, at least one hollow injection needle intended to penetrate the injection site, and at least one piston plunger housed in said body, said body and said piston plunger being able to be moved in axial translation one with respect to the other, said injection assistance device comprising:
a restraining ring element coupled to the body,
an outer sleeve which receives at least a portion of said body, said outer sleeve having a grasping surface and a deflectable leg, said body movable within said outer sleeve between a first position, in which said needle is shielded by said injection assistance device, and a second position, in which said needle is exposed from said injection assistance device by a predetermined insertion length L, the leg providing interference engagement with the restraining ring element and retaining the body in the first position,
a first inner sleeve having a proximal projection, the first inner sleeve movable relative to the outer sleeve between a first inner sleeve position in which the proximal projection is spaced from the leg, and a second inner sleeve position in which the proximal projection contacts the leg, and
a spring between the outer sleeve and the restraining ring element, the spring coupled to said body and to said outer sleeve, said spring in a partially expanded state so as to dampen limited movement of said outer sleeve, in at least one of two directions, respectively distal or proximal, during an injection, and to maintain said body in said second position and said needle at said predetermined insertion length L, during the injection,
wherein proximal movement of the first inner sleeve relative to the outer sleeve to the second inner sleeve position causes the proximal projection to contact and deflect the leg outwardly to release the interference engagement between the leg and the restraining ring element, permitting the spring to automatically move the body from the first position to the second position.

2. Injection assistance device according to claim 1 , wherein the spring is arranged so as to dampen any limited distal or proximal movement of said outer sleeve during said injection step, and to maintain said body in said second position and said needle at said predetermined insertion length during the injection step, regardless of any increase or release of distal pressure exerted by the user on the outer sleeve.

3. Injection assistance device according to claim 1 , wherein, with the body in the second position, a portion of the outer sleeve is separated from a portion of the first inner sleeve by a gap that allows said outer sleeve to move with respect to said body when distal pressure exerted on said outer sleeve is released.

4. Injection assistance device according to claim 1 , wherein, with the body in the second position, the leg is separated from a portion of the first inner sleeve by a space that allows said outer sleeve to move with respect to said body when distal pressure exerted on said outer sleeve is increased.

5. Injection assistance device according to claim 1 , wherein the first inner sleeve is movable between an injection position, in which the needle is exposed from said first inner sleeve, and a final protection position, in which the first inner sleeve covers the needle.

6. Injection assistance device according to claim 5 , wherein, after the injection step, the first inner sleeve is automatically moved from the injection position to the final protection position.

7. Injection assistance device according to claim 1 , further comprising a plunger rod coupled to the piston plunger, wherein movement of the plunger rod in a distal direction actuates movement of the piston plunger to inject said product from said body.

8. Injection assistance device according to claim 1 , wherein the outer sleeve comprises a proximal region and a distal region, wherein a distal end of the proximal region includes the leg.

9. Injection assistance device according to claim 1 , wherein the first inner sleeve comprises a proximal region, a distal region, and a radial wall connecting the proximal region and the distal region, wherein a diameter of the distal region is less than a diameter of the proximal region.

10. Injection assistance device according to claim 1 , wherein the restraining ring element is a ring coupled to the body.

Assignees

• Becton Dickinson France Sas

Inventors

• Carrel Franck
• Perot Frederic
• Barrelle Laurent
• Olive Eric
• Grimard Jean-Pierre
• Gagnieux Samuel

Classifications

• A61M2205/19

  Constructional features of carpules, syringes or blisters · CPC title

• A61M5/326

  Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user · CPC title

• A61M2005/3247

  Means to impede repositioning of protection sleeve from needle covering to needle uncovering position · CPC title

• A61M5/46 Primary

  having means for controlling depth of insertion · CPC title

• A61M5/3272

  having projections following labyrinth paths · CPC title