Lancet assembly

• US 20050085840A1
• Filed: 10/14/2004
• Published: 04/21/2005
• Est. Priority Date: 10/15/2003
• Status: Abandoned Application

• Current Assignee: Surgilance PTE LTD.
• Original Assignee: Surgilance PTE LTD.
• Inventors: Yi, Patrick, Foo, Kook-Ting
• Application Number:
  US10/965,555
• Publication Number:
  US 20050085840A1
• Time in Patent Office: Days
• US Class Current: 606/182
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150717 manually removed
• CPC Class Codes: A61B 5/150885 Preventing re-use
• CPC Class Codes: A61B 5/15111 Semi-automatically triggered, e.g. at the end of the cocking procedure, for instance by biasing the main drive spring or when reaching sufficient contact pressure, the piercing device is automatically triggered without any deliberate action by the user
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/1513 comprising linear sliding guides comprising tooth-shaped elements A61B5/15132
• CPC Class Codes: A61B 5/15142 Devices intended for single use, i.e. disposable
• CPC Class Codes: A61B 5/15144 comprising driving means, e.g. a spring, for retracting the piercing unit into the housing

Abstract

A lancet assembly having a lancet holder and a triggler enclosing a lancet structure. The triggler is partially inserted into a lancet holder from the distal end. The holder is provided with a rigid internal spring holder to receive the spring-loaded lancet structure. The lancet structure is provided with a body coupled to a spring which extend from the proximal end of the body. The spring has a linear axis of compression which coincide with the longitudinal axis of the lancet assembly. A lancet is attached to the body with the sharp tip pointing towards the distal end. The triggler interacts with the lancet holder via a triggering element to maintain the spring in a compressed state such that the lancet structure is in a stable standby position which is not easily triggered by accidental bumps on the assembly. Upon firing, a second spring dampens the extension of the sharp tip, and ultimately assists in the retraction of the tip back into the assembly.

Claims

1. A lancet assembly comprising:

a housing;

a firing element containable within the housing;

a lancet system capable of being extended outside the housing by the firing element;

a triggering element to trigger the firing element;

and a release system to enable the extension of the lancet system beyond the housing.

2. The lancet assembly of claim 1, further comprising a guide system to guide the extension of the lancet system beyond the housing.

3. The lancet assembly of claim 1, further comprising a retention system disable the device from reuse once the lancet system has extended beyond the housing.

4. The lancet assembly of claim 1, the firing element being anchored to the housing.

5. The lancet assembly of claim 1, the firing element being unanchored to the housing.

6. The lancet assembly of claim 1, the firing element being anchored to the lancet system.

7. The lancet assembly of claim 1, the firing element being unanchored to the lancet system.

8. The lancet assembly of claim 1, the firing element being pre-energized, and moved to a second energizaton level upon activation of the triggering element.

9. The lancet assembly of claim 1, the firing element being pre-energized, and remaining at the same pre-energized level upon activation of the triggering element.

10. A lancet assembly comprising:

a housing;

a firing element containable within the housing;

a lancet system capable of being extended outside the housing by the firing element;

a triggering element to trigger the firing element;

a release system to enable the momentary extension of the lancet system beyond the housing; and

a retention system to disable the device from reuse once the lancet system has extended beyond the housing.

11. The lancet assembly of claim 10, the firing element being a first spring, and the retention system including a second spring.

12. The lancet assembly of claim 11, the firing element being pre-energized, and remaining at the same pre-energized level upon activation of the triggering element.

13. The lancet assembly of claim 12, the retention system further comprising at least one clip extending from the triggering element, the at least one L-shaped clip engaging a recesses of the housing.

14. A lancet assembly comprising:

a lancet system including a lancet body having a proximal end, a distal end and guiding elements, the lancet system further including a lancet with a sharp tip that extends from the distal end of the lancet body;

a housing including a lancet holder and a spring holder;

the lancet holder including an open distal end, a lancet holder end wall at a proximal end, and lancet holder side walls extending from the lancet holder end wall, the lancet holder side walls having a mating element including recesses in the interior of the lancet holder side walls; and

the spring holder including an open first end, a second end attached to the lancet holder end wall, and supporting structures there between defining an interior space, the lancet system received within the interior space with the sharp tip proximate the open first end, the supporting structures further provided with receiving elements for engagement with the guiding elements of the lancet system;

a firing element containable within the housing, the firing element being a first spring located loosely between the proximal end of the lancet body and the second end of the spring holder, the first spring having a proximal end and a linear axis of compression, the supporting structures of the spring holder having the receiving elements for engagement with the guiding elements of the lancet system to allow movement of the lancet body along the axis of compression;

a triggering element to trigger the firing element, the triggering element including;

a triggler end wall for closing the distal end of the lancet holder and having an aperture wherethrough the sharp distal tip of the lancet fires when triggered;

a stabilizing element, extending from the triggler end wall and inserted between the side walls of the lancet holder and the supporting structures of the spring holder for sliding movement along the axis of compression, the stabilizing element further limiting movement of the triggler lateral to the axis of compression; and

a safety catch for maintaining the triggler between standby and firing positions, wherein the safety catch includes L-shaped clips extending from two opposing sides of the triggler end wall, the L-shaped clips engaging the recesses of the mating element of the lancet holder;

and a release system to enable the extension of the lancet system beyond the housing, the release system including triggering elements and a second spring, the triggering elements for engagement with the guiding elements of the lancet system, the triggering elements in the standby position maintaining the first spring in a compressed state by forcing the guiding elements toward the proximal end of the lancet holder, the triggering elements further movable to the firing position when a compression force is applied to the triggler end wall, the triggering elements in the firing position being disengaged from the guiding elements such that the first spring is released from the compressed state and the sharp distal end of the lancet system is fired through the aperture of the triggler end wall, the release system providing the momentary extension of the sharp tip of the lancet beyond the aperture of the triggler end wall with the provision of the second spring located loosely between the distal end of the lancet system, and the triggler end wall.

15. The lancet assembly of claim 14, wherein the guiding elements comprises a plurality of guiding pins extending laterally from at least two sides of the lancet body.

16. The lancet assembly of claim 15, wherein the receiving elements of the supporting structures of the spring holder comprise a plurality of longitudinal slits within the supporting structures wherethrough each of the guiding pins extend.

17. The lancet assembly of claim 14, wherein the triggering elements include a pair of actuating ribs with wedged ends extending from two opposing sides of the triggler end wall;

and

wherein the guiding elements include a pair of guiding pins extending laterally from two opposing sides of the lancet body, the triggler inserted into the lancet holder such that the wedged ends engage the guiding pins, the actuating rib in the armed position maintaining the first spring in a high potential energy compressed state by forcing the guiding pins towards the proximal end of the lancet holder, the actuating rib further bendable to the firing position when the compression force is applied to the triggler end wall.

18. The lancet assembly of claim 14, wherein the lancet holder further comprises ridges attached to the spring holder, the lancet holder to strengthen the supporting structures.