Injection set and injection assistance device

• US 8,308,687 B2
• Filed: 04/20/2006
• Issued: 11/13/2012
• Est. Priority Date: 04/20/2005
• Status: Active Grant

• Current Assignee: Becton Dickinson France (Becton Dickinson & Co)
• Original Assignee: Becton Dickinson France (Becton Dickinson & Co)
• Inventors: Carrel, Franck, Perot, Frederic, Grimard, Jean-Pierre
• Primary Examiner(s): Lucchesi, Nicholas
• Assistant Examiner(s): MATNEY, BROOKE MARIE
• Application Number:
  US11/912,270
• Publication Number:
  US 20090318864A1
• Time in Patent Office: 2,399 Days
• Field of Search: 604/117, 604/110, 604/197, 604/135, 604/136, 604/131, 604/157, 604/165.01, 604/165.02, 604/240
• US Class Current: 604/136
• CPC Class Codes: A61M 2005/3247 Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• CPC Class Codes: A61M 2005/3267 Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body
• CPC Class Codes: A61M 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
• CPC Class Codes: A61M 5/3272 having projections following labyrinth paths
• CPC Class Codes: A61M 5/3287 Accessories for bringing the needle into the body; Automatic needle insertion A61M5/20, A61M5/31525 take precedence
• CPC Class Codes: A61M 5/46 having means for controlling depth of insertion

Abstract

The present invention relates to an injection assistance device (1) for an injection device (3) comprising one body (2), one needle (7), and one piston plunger (26), characterized in that it comprises: a hollow sleeve (4) receiving the body (2), coupling arrangement (10) for moving the piston plunger (26) from an end-of-insertion position to an end of injection position the coupling arrangement being maintained in a passive state until the end-of-insertion position, spacer arrangement (8) to maintain the piston plunger (26) and the body (2) in an initial position, disengaging arrangement (22, 14, 15, 16) linked with the spacer arrangement (8), the spacer arrangement (8) and/or disengaging arrangement (22, 14, 15, 16; 25, 31) being arranged in order not to free the distal displacement of the piston plunger (26) before the one of the body (2).

Claims

1. Injection assistance device (1) for an injection device (3) for injecting a product (25) into an injection site (27), this injection device (3) comprising at least one hollow body (2) intended to receive a product (25) that is to be injected, at least one hollow injection needle (7) intended to penetrate the injection site (27), and at least one piston plunger (26) housed in the said body (2), the said body (2) and the said piston plunger (26) being able to be moved in axial translation one with respect to the other, characterized in that the said injection assistance device (1) comprises at least:

a hollow sleeve (4) provided with at least one bearing surface (5) intended to come into contact with the surface of the said injection site (27), the said sleeve (4) being intended to receive, at least in part, the said body (2) and being arranged in such a way as to allow the said body (2) axial mobility between at least a first position known as the initial position in which the said needle (7) is covered by the said hollow sleeve (4) so as to be not exposed over its insertion length, and a second position known as the insertion position in which the said needle (7) extends beyond the said hollow sleeve (4) so as to be exposed by a predetermined insertion length L,

a coupling (10, 76) arranged in such a way as to be coupled to said piston plunger (26) at least during an injection step so as to move said piston plunger (26) from an end-of-insertion position to an end of injection position and to administer the injection when submitted to a distal pressure exerted thereon,

a spacer (8;

30;

59;

69;

81, 80) arranged in such a way as to maintain at least said piston plunger (26) and said body (2) in said initial position,

a disengager (22, 14, 15, 16;

25, 31;

61;

70, 71;

4) linked with said spacer (8;

30;

59;

69;

81, 80), said spacer (8;

30;

59;

69;

81, 80) and disengager (22, 14, 15, 16;

25, 31;

61;

70, 71;

4) being arranged in order to free distal displacement of said piston plunger (26) only after distal displacement of said body (2),

with the said body (2) comprising a flange (6) at its proximal end, the said spacer comprises at least one deflecting tab (59) engaging the said flange (6) and the said coupling (10) in the insertion position so as to inhibit distal movement of the said coupling (10) relative to the said body (2), the said tab (59) deflecting to disengage from the said flange (6) at the end of the insertion position with the said needle (7) being exposed by the predetermined insertion length L so as to allow the said coupling (10) to move distally relative to the said body (2).

2. Injection assistance device (1) according to claim 1, characterized in that it further comprises:

an automatic inserter (9;

49;

53;

66;

76) arranged in such a way as to cause the said body (2) to move axially in the distal direction and to insert the said hollow needle (7) into the injection site (27),

a retainer (14, 15, 18;

12, 125, 30, 31;

44, 45;

48, 49;

61, 62;

69, 70, 71;

77, 76) for retaining the said body (2) in the said initial position, the said automatic inserter (9;

49;

53;

66;

76) being activated by the release of the said retainer (14, 15, 18;

12, 125, 30, 31;

44, 45;

48, 49;

61, 62;

69, 70, 71;

77, 76).

3. Injection assistance device (1) according to claim 2, characterized in that the said coupling comprises at least one plunger rod (10) detached from the said piston plunger (26), the said plunger rod (10) being able, once coupled to said piston plunger (26), to drive the said piston plunger (26) in the distal direction when urged in the distal direction.

4. Injection assistance device (1) according to claim 2, characterized in that the said automatic inserter comprises third elastic return means (9;

49;

53;

66;

76) connected to the said sleeve (4) and intended to urge the said body (2) from the initial position to the said insertion position.

5. Injection assistance device (1) according to claim 1, characterized in that said spacer forming a substantially rigid link between said body (2) and said piston plunger (26) and preventing their relative displacement before the triggering of said disengager (22, 14, 15, 16;

25, 31;

61).

6. Injection assistance device (1) according to claim 5, characterized in that said disengager (22, 14, 15, 16;

25, 31;

61) is arranged in order to automatically disengage said spacer (8;

30;

59;

69) when the insertion position is reached and free the relative displacement of said piston plunger (26) and said body (2).

7. Injection assistance device (1) according to claim 1, characterized in that it further comprises an automatic injecter (53;

67;

76) arranged in such a way as to urge the said coupling (10, 76) at the end of the insertion position without manual intervention on the part of the user.

8. Injection assistance device (1) according to claim 7, characterized in that the said automatic injecter comprises first return means (53;

67;

76) connected to the said coupling (10) and intended to urge the said coupling (10) from the insertion position to the said end-of-injection position.

9. Injection assistance device (1) according to claim 7, characterized in that the said automatic injecter (53;

67;

76) being activated by the release of the said spacer (59;

10a, 69a).

10. Injection assistance device (1) according to claim 9, characterized in that triggering said disengager (22, 14, 15, 16;

25, 31;

61) simultaneously performs the disengagement of said spacer (8;

30;

59;

69) and the activation of said automatic injecter (53;

67;

76).

11. Injection assistance device (1) according to claim 1, characterized in that it further comprises a final protector (4;

8;

35, 37) arranged in such a way as to cover the said needle (7) in a post-injection final protection position, wherein said final protector is able to move in translation with respect to the said body (2) between an injection position in which the needle (7) is exposed and a final protection position in which the needle (7) is covered.

12. Injection assistance device (1) according to claim 11, characterized in that the final protector is chosen from the said sleeve (4) and an intermediate sheath (8;

35, 37) arranged between the said sleeve (4) and the said body (2).

13. Injection assistance device (1) according to claim 11, characterized in that it comprises an automatic activator (9;

42;

50;

57;

78) for activating the said final protector (4;

8;

35) at the end of injection.

14. Injection assistance device (1) according to claim 13, characterized in that the automatic activator comprises second return means (9;

42;

50;

57;

78) connected to the said final protector (4;

8;

35) intended to urge the said body (2) from the said injection position to the said final protection position.

15. Injection assistance device (1) according to claim 11, characterized in that it comprises a lock (17;

34, 41;

52) arranged in such a way as to at least limit the translational movement of the said body (2) with respect to the said final protector (4;

8;

35) in the final protection position.

16. Injection assistance device (1) according to claim 1, characterized in that it comprises a controller (19;

32;

59;

82;

91;

94) arranged in such a way as to delimit the said insertion position of the said body (2).

17. Injection assistance device (1) according to claim 16, characterized in that the said controller comprises at least one radial stop (19;

32;

94;

91) provided in the said sleeve (4) and intended to have the said body (2) bearing against it.

18. Injection assistance device (1) according to claim 16, characterized in that with the said piston plunger (26) connected to a plunger rod (10) intended to urge the said piston plunger (26) in the distal direction in order to perform the injection, the said controller comprises a blocker (59) for blocking the translational movement of the said plunger rod with respect to the said piston plunger, the said blocker being able to be released when the said body (2) is at the end of the insertion position, the said needle (7) being exposed by the said predetermined insertion length L.

19. Injection set (100) for injecting a product (25) into an injection site, the said injection set (100) comprising at least:

an injection device (3) comprising at least;

a hollow body (2) intended to receive a product (25) that is to be injected, the said body (2) being equipped with a hollow injection needle (7) intended, during a first step known as the insertion step, to penetrate an injection site (27) and, during a second step known as the injection step, to channel the said product (25) from the said body (2) towards the said injection site (27),

at least one piston plunger (26) housed in a more or less sealed manner in the said body (2) and intended to be moved in the distal direction by movement means in the said injection step during which it drives the said product (25) through the said needle (7),

characterized in that it comprises at least an injection assistance device (1) for assisting with the injection device (3) according at least to claim 1.

20. Injection set (100) according to 19, characterized in that it is in the form of a kit that can be assembled prior to use.