Lancet having adjustable penetration depth

• US 6,156,051 A
• Filed: 11/03/1999
• Issued: 12/05/2000
• Est. Priority Date: 06/11/1998
• Status: Expired due to Term

• Current Assignee: Stat Medical Devices Incorporated
• Original Assignee: Stat Medical Devices Incorporated
• Inventors: Schraga, Steven
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): Bui, Vy Q.
• Application Number:
  US09/433,366
• Time in Patent Office: 398 Days
• Field of Search: 606/181, 606/182, 606/167, 606/184
• US Class Current: 606/181
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150183 Depth adjustment mechanism using end caps mounted at the distal end of the sampling device, i.e. the end-caps are adjustably positioned relative to the piercing device housing for example by rotating or screwing
• CPC Class Codes: A61B 5/15019 Depth adjustment mechanism using movable stops located inside the piercing device housing and limiting the travel of the drive mechanism mechanisms using distal end caps A61B5/150183, mechanisms at the piercing element carrier proximal end A61B5/150198
• CPC Class Codes: A61B 5/150435 Specific design of proximal end
• CPC Class Codes: A61B 5/150549 Protectors removed by rotational movement, e.g. torsion or screwing
• CPC Class Codes: A61B 5/150717 manually removed
• CPC Class Codes: A61B 5/15113 Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit

Abstract

Lancet device having an adjustable penetration depth. The lancet device includes a housing, a cap for covering the housing and for positioning the lancet device relative to a skin surface, a needle holding member for holding a lancet which needle holding member is at least partially contained within the housing, a biasing element for biasing the needle holding member toward an extended position, and a trigger for releasing the needle holding member from a retracted position. The lancet device further includes a mechanism for adjusting a penetration depth of a lancet. The penetration depth adjustment mechanism may involve adjusting a travel distance of the needle holding member, wherein the mechanism is positioned within at least one of the housing and the cap during at least a portion of length of travel of the needle holding member. The penetration depth adjustment mechanism may involve adjusting a travel distance of the needle holding member by adjusting a length of the needle holding member. The penetration depth adjustment mechanism may involve aligning at least one stop of the housing with at least one protrusion of the needle holding member. The penetration depth adjustment mechanism may involve a cavity in the needle holding member for holding a lancet, wherein the cavity depth of the needle holding member is adjusted.

Claims

1. A lancet device, comprising:

a housing containing at least one stop and having an end, the housing having a longitudinal axis,

a cap for covering the end of the housing and for positioning the lancet device relative to a skin surface;

a lancet holding member for holding a lancet, the lancet holding member being separate from the lancet, the lancet holding member being at least partially contained within the housing, the lancet holding member having at least one protrusion for striking the at least one stop of the housing, the lancet holding member having a longitudinal axis;

a biasing element for biasing the lancet holding member toward an extended position, the biasing element expanding in a direction of the longitudinal axis of the lancet holding member and pushing the lancet holding member;

a trigger for releasing the lancet holding member from a retracted position; and

an alignment mechanism capable of aligning the at least one stop of the housing and the at least one protrusion of the lancet holding member to adjust the extended position of the lancet holding member.

2. The lancet device of claim 1, wherein the housing comprises an upper housing and a lower housing, and wherein the alignment mechanism comprises a threaded connection between the upper housing and the lower housing.

3. The lancet device of claim 2, wherein the at least one stop comprises a guide collar on the lower housing.

4. The lancet device of claim 1, wherein the housing comprises an upper housing and a lower housing, and wherein the alignment mechanism comprises a spring between the upper housing and the lower housing to bias the lower housing into the upper housing, and wherein the alignment mechanism comprises a spacer between the upper housing and the lower housing to act against a biasing force of the spring.

5. The lancet device of claim 4, wherein the at least one stop comprises a guide collar on the lower housing.

6. The lancet device of claim 1, wherein the housing comprises an upper housing and a lower housing, the lower housing having the at least one stop which comprises a plurality of stops, and wherein the alignment mechanism comprises a threaded connection between the upper housing and the lower housing.

7. The lancet device of claim 6, wherein the plurality of stops comprise stops at different radial and axial positions on an interior of the lower housing.

8. The lancet device of claim 1, wherein the at least one stop comprises a plurality of stops, and wherein the alignment mechanism comprises a rotary connection between the housing and the lancet holding member.

9. The lancet device of claim 8, wherein the plurality of stops comprise stops at different radial and axial positions on an interior of the housing.

10. The lancet device of claim 1, wherein the lancet holding member includes an elongated slot and the housing includes a peg extending through the elongated slot.

11. A lancet device, comprising:

a housing having a proximal end and a distal end;

a proximal cap for covering the proximal end of the housing and for positioning the lancet device relative to a skin surface;

a lancet holding member for holding a lancet, the lancet holding member being at least partially contained within the housing, the lancet holding member comprising at least one protrusion;

a biasing element for biasing the lancet holding member toward an extended position;

a trigger for releasing the lancet holding member from a retracted position;

a distal member covering the distal end of the housing, the distal member including at least one stop for engaging the at least one protrusion of the lancet holding member; and

wherein a position of the distal member relative to the lancet holding member is adjustable so as to allow adjustment of a position of engagement of the at least one protrusion of the lancet holding member with the at least one stop of the distal member, such that a length of travel of the lancet holding member is adjusted.

12. The lancet device of claim 11, wherein the at least one protrusion of the lancet holding member comprises a flange.

13. The lancet device of claim 11, wherein the lancet holding member includes an elongated slot and the housing includes a peg extending through the elongated slot.

14. The lancet device of claim 11, wherein a portion of the distal member is positioned within the housing.

15. The lancet device of claim 11, wherein the distal member is capable of moving axially relative to the housing.

16. The lancet device of claim 11, further comprising a threaded connection between the distal member and the housing.

17. The lancet device of claim 16, wherein the distal member comprises external threads and the housing comprises internal threads.

18. The lancet device of claim 17, wherein the at least one protrusion of the lancet holding member comprises a flange.

19. The lancet device of claim 11, wherein the at least one stop of the distal member is perpendicular to an axis of the housing.

20. The lancet device of claim 11, wherein the biasing element comprises a spring.

21. The lancet device of claim 11, wherein the biasing element abuts a flange on the lancet holding member.

22. The lancet device of claim 11, wherein the biasing element comprises a spring which abuts a flange on the lancet holding member.

23. The lancet device of claim 11, wherein the at least one protrusion of the lancet holding member comprises a first flange,

the lancet holding member includes an elongated slot and the housing includes a peg extending through the elongated slot,

the distal member is capable of moving axially relative to the housing, and

the biasing element comprises a spring which abuts a second flange on the lancet holding member.

24. A lancet device, comprising:

a housing comprising at least one stop;

a cap for covering an end of the housing and for positioning the lancet device relative to a skin surface;

a lancet holding member for holding a lancet, the lancet holding member being separate from the lancet, the lancet holding member being at least partially contained within the housing, the lancet holding member comprising at least one protrusion;

a biasing element for biasing the lancet holding member toward an extended position;

a trigger for releasing the lancet holding member from a retracted position; and

wherein a position of the at least one stop of the housing and the lancet holding member relative to each other is adjustable so as to allow adjustment of a position of engagement of the at least one protrusion of the lancet holding member with the at least one stop of the housing, such that a length of a stroke of the lancet holding member is adjusted.

25. The lancet device of claim 24, wherein the at least one protrusion of the lancet holding member comprises a flange.

26. The lancet device of claim 24, wherein the lancet holding member includes an elongated slot and the housing includes a peg extending through the elongated slot.

27. The lancet device of claim 24, wherein the biasing element comprises a spring.

28. The lancet device of claim 24, wherein the biasing element abuts a flange on the lancet holding member.

29. The lancet device of claim 24, wherein the biasing element comprises a spring which abuts a flange on the lancet holding member.

30. The lancet device of claim 24, wherein the at least one protrusion of the lancet holding member comprises a first flange.

31. A lancet device, comprising:

a housing having an end;

a peg fixed to the housing;

a cap for covering the end of the housing and for positioning the lancet device relative to a skin surface;

a lancet holding member for holding a lancet, the lancet holding member being at least partially contained within the housing, the lancet holding member including an elongated slot for receiving the peg;

a biasing element between the peg and lancet holding member for biasing the lancet holding member toward an extended position;

a trigger for releasing the lancet holding member from a retracted position; and

wherein a length of travel of said lancet holding member is adjustable.

32. The lancet device of claim 31, wherein the housing comprises a first segment and a second segment.

33. The lancet device of claim 32, wherein a portion of the first segment of the housing is positioned within the second segment of the housing.

34. The lancet device of claim 32, wherein the first segment of the housing is allowed to move axially relative to the second segment of the housing.

35. The lancet device of claim 32, further comprising a threaded connection between the first segment of the housing and the second segment of the housing.

36. The lancet device of claim 32, further comprising external threads on the first segment of the housing and internal threads on the second segment of the housing.

37. The lancet device of claim 32, wherein the first segment of the housing comprises at least one stop, and the lancet holding member comprises at least one protrusion for engaging the at least one stop of the first segment of the housing.

38. The lancet device of claim 37, wherein the at least one protrusion of the lancet holding member comprises a flange.

39. The lancet device of claim 31, wherein the biasing element comprises a spring.

40. The lancet device of claim 31, wherein the biasing element abuts a flange on the lancet holding member.

41. A lancet device, comprising:

a housing having a proximal end and a distal end;

a proximal cap for covering the proximal end of the housing and for positioning the lancet device relative to a skin surface;

a distal member for covering the distal end of the housing;

a lancet holding member for holding a lancet, the lancet holding member being at least partially contained within the housing;

a biasing element for biasing the lancet holding member toward an extended position;

a trigger for releasing the lancet holding member from a retracted position; and

a travel adjustment mechanism capable of adjusting a length of a stroke of said lancet holding member, the travel adjustment mechanism comprising at least one protrusion on the lancet holding member and at least one stop on the distal member for engaging the at least one protrusion on the lancet holding member.