Safety needle guard

• US 8,298,180 B2
• Filed: 11/21/2008
• Issued: 10/30/2012
• Est. Priority Date: 11/21/2007
• Status: Active Grant

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Meehan, Michael, Wong, Andrew, D' Arrigo, Christina
• Primary Examiner(s): Mehta, Bhisma
• Application Number:
  US12/275,604
• Publication Number:
  US 20090216201A1
• Time in Patent Office: 1,439 Days
• Field of Search: 604/110, 604/162, 604/163, 604/164.08, 604/192, 604/198, 604/199, 604/263
• US Class Current: 604/110
• CPC Class Codes: A61B 17/3401 Puncturing needles for the peridural or subarachnoid space or the plexus, e.g. for anaesthesia local anaesthesia A61M19/00
• CPC Class Codes: A61B 2090/0801 Prevention of accidental cutting or pricking
• CPC Class Codes: A61M 2005/3201 Coaxially assembled needle cannulas placed on top of another, e.g. needles having different diameters
• CPC Class Codes: A61M 2005/325 Means obstructing the needle passage at distal end of a needle protection sleeve
• CPC Class Codes: A61M 5/3273 freely sliding on needle shaft without connection to syringe or needle

Abstract

A needle guard is disclosed. The needle guard includes a binding plate defining a multi-slot aperture adapted to receive a needle cannula therethrough. The needle guard also includes a biasing member for biasing the needle cannula within the multi-slot aperture, and a sensing arm connected to the binding plate. The sensing arm is adapted to contact a portion of the needle cannula, and is positionable for restricting movement of the needle cannula. The multi-slot aperture may include a first region having a first dimension, a second region having a second dimension, and optionally, a third region having a third dimension with the third dimension being smaller than the second dimension and the second dimension being smaller than the first dimension.

Claims

1. A needle guard, comprising:

a binding plate defining a multi-slot aperture, the multi-slot aperture adapted to receive a needle cannula therethrough;

a biasing member biasing the needle cannula within the multi-slot aperture; and

a sensing arm connected to the binding plate adapted to contact a portion of the needle cannula, and positionable for restricting movement of the needle cannula in a distal direction,

wherein the multi-slot aperture comprises a first region having a first dimension, and a second region having a second dimension, the second dimension being smaller than the first dimension, and wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region, wherein upon advancement of the needle cannula within the multi-slot aperture by the biasing member, the binding plate is adapted to tilt and contact the needle cannula, thereby preventing movement of the needle cannula in a proximal direction.

2. The needle guard of claim 1, wherein the biasing member is disposed adjacent the multi-slot aperture.

3. The needle guard of claim 1, wherein the biasing member is initially positioned adjacent the first region of the multi-slot aperture.

4. The needle guard of claim 1, wherein the biasing member is adapted to apply a biasing force adjacent the multi-slot aperture in a direction that is substantially perpendicular to a through-axis of the multi-slot aperture.

5. The needle guard of claim 1, wherein the sensing arm further comprises a transverse barrier.

6. The needle guard of claim 5, wherein the transverse barrier comprises:

a base plate connected to the binding plate and extending in a distal direction from the binding plate, and

an engagement plate connected to, and extending from, the base plate in a direction toward a through-axis of the multi-slot aperture, wherein the engagement plate comprises a contact surface for contacting a portion of the needle cannula at a location distal from the multi-slot aperture.

7. The needle guard of claim 6, wherein the contact surface comprises an angled restraining lip extending toward the multi-slot aperture.

8. The needle guard of claim 1, further comprising a biasing element biasing the binding plate in a distal to proximal direction to bias the binding plate toward a tilted position.

9. The needle guard of claim 8, further comprising a second biasing element biasing the binding plate in a direction substantially aligned with the multi-slot aperture.

10. The needle guard of claim 1, wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region in a direction perpendicular to a longitudinal axis of the needle cannula.

11. A needle guard, comprising:

a housing, defining an interior, and having a first port and a second port extending therethrough and aligned along an axis of the housing; and

a locking mechanism disposed within the interior of the housing, the locking mechanism comprising;

a binding plate defining a multi-slot aperture, at least a portion of the multi-slot aperture aligned with the first port and the second port along the axis of the housing, wherein the first port, the second port, and the multi-slot aperture are adapted to receive a needle cannula therethrough,

a biasing member for biasing the needle cannula within the aperture, and

a sensing arm connected to the binding plate adapted to contact the needle cannula, and positionable for restricting movement of the needle cannula in a distal direction,

wherein the multi-slot aperture comprises a first region having a first dimension, and a second region having a second dimension, the second dimension being smaller than the first dimension, and wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region, wherein upon advancement of the needle cannula within the multi-slot aperture by the biasing member, the binding plate is adapted to tilt and contact the needle cannula, thereby preventing movement of the needle cannula in a proximal direction.

12. The needle guard of claim 11, wherein the biasing member is disposed adjacent the multi-slot aperture.

13. The needle guard of claim 11, wherein the interior of the housing comprises an angled interior surface for accommodating a portion of the binding plate thereagainst.

14. The needle guard of claim 11, wherein the biasing member is adapted to apply a biasing force adjacent the multi-slot aperture in a direction that is substantially perpendicular to a through-axis of the multi-slot aperture.

15. The needle guard of claim 11, wherein the sensing arm further comprises a transverse barrier.

16. The needle guard of claim 15, wherein the transverse barrier comprises:

a base plate connected to the binding plate and extending in a distal direction from the binding plate, and

an engagement plate connected to, and extending from, the base plate in a direction toward a through-axis of the multi-slot aperture, wherein the engagement plate comprises a contact surface for contacting a portion of the needle cannula at a location distal from the multi-slot aperture.

17. The needle guard of claim 16, wherein the contact surface comprises an angled restraining lip extending toward the multi-slot aperture.

18. The needle guard of claim 11, wherein the locking mechanism is adapted to pivot within the interior of the housing about a pivoting axis to position the sensing arm to restrict movement of the needle cannula.

19. The needle guard of claim 11, further comprising a biasing element biasing the binding plate in a distal to proximal direction to bias the binding plate toward a tilted position.

20. The needle guard of claim 19, further comprising a second biasing element biasing the binding plate in a direction substantially aligned with the multi-slot aperture.

21. The needle guard of claim 11, wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region in a direction perpendicular to a longitudinal axis of the needle cannula.

22. A device, comprising:

a needle cannula having a cannula tip;

a housing disposed about a portion of the needle cannula, defining an interior, and having a first port and a second port extending therethrough and aligned along an axis of the housing; and

a locking mechanism disposed within the interior of the housing, the locking mechanism comprising;

a binding plate defining a multi-slot aperture, at least a portion of the multi-slot aperture aligned with the first port and the second port along the axis of the housing, wherein the first port, the second port, and the multi-slot aperture are adapted to receive the needle cannula therethrough;

a biasing member for biasing the needle cannula within the aperture, the biasing member positionable for restricting movement of the needle cannula in a distal direction; and

a transverse barrier connected to the binding plate adapted to contact a portion of the needle cannula, and positionable for restricting movement of the needle cannula in a proximal direction, wherein upon advancement of the needle cannula within the multi-slot aperture by the biasing member, the transverse barrier and the binding plate are adapted to tilt and contact the needle to prevent movement of the needle cannula in the proximal direction

wherein the multi-slot aperture comprises a first region having a first dimension, and a second region having a second dimension, the second dimension being smaller than the first dimension, and wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region.

23. The device of claim 22, wherein the biasing member is disposed adjacent the multi-slot aperture.

24. The device of claim 22, wherein the transverse barrier comprises:

a base plate connected to the binding plate and extending in a distal direction from the binding plate, and

an engagement plate connected to, and extending from, the base plate in a direction toward a through-axis of the multi-slot aperture, wherein the engagement plate comprises a contact surface for contacting a portion of the needle cannula at a location distal from the multi-slot aperture.

25. The device of claim 24, wherein the contact surface comprises an angled restraining lip extending toward the multi-slot aperture in a direction that is substantially parallel to the through-axis of the multi-slot aperture.

26. The device of claim 22, wherein the transverse barrier comprises a contact surface, and the transverse barrier is restrained from restricting movement of the needle cannula by contact between the contact surface and the needle cannula.

27. The device of claim 26, wherein the transverse barrier is positioned to restrict movement of the needle cannula in the distal direction when contact between the contact surface and the needle cannula is interrupted.

28. The device of claim 22, wherein the locking mechanism is adapted to pivot within the interior of the housing about a pivoting axis to position the sensing arm to restrict movement of the needle cannula.

29. The device of claim 28, wherein the locking mechanism is adapted to pivot about the pivoting axis when contact between a contact surface of the sensing arm and the needle cannula is interrupted.

30. The device of claim 22, wherein the interior of the housing comprises an angled interior surface for accommodating a portion of the binding plate thereagainst.

31. The device of claim 22, wherein the biasing member is adapted to bias the needle cannula against the first port and the second port of the housing in a restrained position, and against at least a portion of the multi-slot aperture in an activated position.

32. The device of claim 22, further comprising a biasing element biasing the binding plate in a distal to proximal direction to bias the binding plate toward a tilted position.

33. The device of claim 32, further comprising a second biasing element biasing the binding plate in a direction substantially aligned with the multi-slot aperture.

34. The device of claim 22, wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region in a direction perpendicular to a longitudinal axis of the needle cannula.

35. A method of actuating a needle guard, comprising the steps of:

providing a needle guard disposed about at least a portion of a needle cannula, the needle guard comprising;

a housing, defining an interior, and having a first port and a second port extending therethrough and aligned along an axis of the housing; and

a locking mechanism disposed within the interior of the housing, the locking mechanism comprising;

a binding plate defining a multi-slot aperture, at least a portion of the multi-slot aperture aligned with the first port and the second port along the axis of the housing, wherein the first port, the second port, and the multi-slot aperture are adapted to receive the needle cannula therethrough;

a biasing member for biasing the needle cannula within the aperture;

a sensing arm connected to the binding plate and comprising a contact surface, wherein the sensing arm is adapted to transition from a restrained position in which the contact surface contacts a portion of the needle cannula, to an activated position in which the sensing arm restricts movement of the needle cannula in a distal direction; and

at least one biasing element for biasing the binding plate in a distal to proximal direction, wherein the multi-slot aperture comprises a first region having a first dimension, and a second region having a second dimension, the second dimension being smaller than the first dimension, and wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region, wherein upon advancement of the needle cannula within the multi-slot aperture by the biasing member, the binding plate is adapted to tilt and contact the needle cannula, thereby preventing movement of the needle cannula in a proximal direction; and

transitioning the sensing arm from the restrained position to the activated position by interrupting contact between the contact surface and the needle cannula.

36. The method of claim 35, wherein the biasing member is adapted to advance the needle cannula within the multi-slot aperture from the first region to the second region in a direction perpendicular to a longitudinal axis of the needle cannula.