Lancet assembly

• US 7,879,059 B2
• Filed: 05/17/2005
• Issued: 02/01/2011
• Est. Priority Date: 10/06/2004
• Status: Active Grant

• Current Assignee: Izumi-Cosmo Co., Ltd.
• Original Assignee: Izumi-Cosmo Co., Ltd.
• Inventors: Abe, Teruyuki, Seki, Kazuharu
• Primary Examiner(s): Ho; (Jackie) Tan-Uyen T
• Assistant Examiner(s): EASTWOOD, DAVID C
• Application Number:
  US11/664,821
• Publication Number:
  US 20080058847A1
• Time in Patent Office: 2,086 Days
• Field of Search: 606/181, 606/182, 604/136, 604/110, 604/111, 604/192, 604/195, 600/580, 83397-398, 401/134, 220/212, 220/810, 220/254.1, 220/200, 222/52, 222/526, 222/83, 222/83.5, 206/363, 206/364, 206/365
• 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 5/150519 Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
• CPC Class Codes: A61B 5/150564 Protectors removed by pulling or pushing
• CPC Class Codes: A61B 5/150618 Integrally moulded protectors, e.g. protectors simultaneously moulded together with a further component, e.g. a hub, of the piercing element
• CPC Class Codes: A61B 5/150702 fully automatically removed, i.e. the removing does not require any action by the user
• CPC Class Codes: A61B 5/150725 removal procedure linked to further actions, e.g. cocking of the piercing device, which indicate that the piercing device is used or tempered
• CPC Class Codes: A61B 5/150916 by blocking components, e.g. piston, driving device or fluid passageway
• 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

Abstract

A lancet assembly is disclosed which eliminates the need for removing a resin cover that covers a pricking element. When a lancet structure is inserted into a lancet holder, a force is applied so as to separate a lancet cover, that encloses a distal end of a pricking element, from a lancet body so that the distal end of the pricking element which has been enclosed by the lancet cover is exposed in the lancet holder, and the opening of the lancet holder is positioned in front of the distal end of the pricking element. The lancet structure has a trigger which launches the pricking element of which the distal end is exposed, when the lancet structure is continually pushed into the lancet holder.

Claims

1. A lancet assembly comprising:

a lancet structure including an ejector and a lancet, the ejector comprising a trigger, an arm, a spring having a front end and a rear end, and a base attached to the trigger, the arm, and the spring, the spring having a connector provided on the front end, and being connected to the base at the rear end, and the lancet comprising a lancet body connected to the connector, a lancet cover, and a pricking element having a distal end, the pricking element being disposed within and straddling across the lancet body and the lancet cover, and the distal end of the pricking element being enclosed by the lancet cover, the lancet cover including a tapered portion; and

a lancet holder having reverse tapered portion, a front end and an opening configured to enable the distal end of the pricking element to pass therethrough, the lancet holder being configured to hold the lancet structure,

wherein when the lancet structure is inserted into the lancet holder and the base is moved toward the connector so as to compress the spring with the connector being engaged with the lancet holder, the lancet cover is separated from the pricking element by movement in an oblique direction of the lancet cover by the tapered portion of the lancet cover being moved along the reverse tapered portion of the lancet holder, relative to the pricking element, which remains substantially in the same position, thereby exposing the distal end of the pricking element which has been enclosed, and when the base is further moved thereafter, the trigger disengages the engaged connector.

2. The lancet assembly according to claim 1 wherein the lancet cover is configured to be automatically separated from the pricking element.

3. The lancet assembly according to claim 1 wherein the pricking element is disposed in the lancet cover, and the lancet cover is arranged so as to be displaced laterally relative to a longitudinal direction of the pricking element when the spring is compressed so as to enable the pricking element to pass through the opening in the lancet holder.

4. The lancet assembly according to claim 1 wherein the lancet cover and the lancet body are integrally connected by a weakened portion which is located therebetween.

5. The lancet assembly according to claim 1 wherein the lancet cover and the lancet body are separate members.

6. The lancet assembly according to claim 4 wherein

the arm includes a front end;

the lancet cover includes a rear side and is located in front of the arm; and

when the base is moved toward the connector so as to compress the spring while keeping the front end of the arm in contact with the rear side of the lancet cover, the lancet cover is separated from the lancet body at the weakened portion.

7. The lancet assembly according to claim 5 wherein

the arm includes a front end;

the lancet cover includes a rear side and is positioned in front of the arm;

when the base is moved toward the connector so as to compress the spring while keeping the front end of the arm in contact with the rear side of the lancet cover, the lancet cover moves forward relative to the lancet body.

8. The lancet assembly according to claim 1 wherein a front end of the arm engages the lancet cover.

9. The lancet assembly according to claim 8 wherein the front end of the arm comprises a hooked portion or an L-shaped portion which is bent inward, and the lancet cover comprises on a side a portion which engages said hooked portion.

10. The lancet assembly according to claim 1 wherein the separated lancet cover is moved forward and obliquely by the arm when the arm is moved forward, so that the opening at the front end of the lancet holder is located in front of the exposed distal end of the pricking element.

11. The lancet assembly according to claim 10 wherein

the lancet holder has a guide provided on a side inner wall at the front end thereof;

the lancet cover has a guided device which is guided by the guide; and

the guide and the guided device cooperate so that the lancet cover which has been separated is moved forward by the arm moving forward while the lancet cover moves forward and obliquely upward.

12. The lancet assembly according to claim 1 wherein the base, the arm, the spring and the connector of the base are integrally formed of a resin.

13. The lancet assembly according to claim 1 wherein the lancet body and the lancet cover are formed by molding a resin integrally with the pricking element.

14. The lancet assembly according claim 4 wherein the weakened portion comprises a notch portion, and the lancet cover is separated from the lancet body and from the pricking element through breakage of the notch portion.

15. The lancet assembly according to claim 1 wherein the connection of the lancet body to the connector is achieved by the lancet body and the connector both comprising complementary forms which are able to engage each other and which are unable to be separated in a pricking direction.

16. The lancet assembly according to claim 15 wherein the connector comprises a recess and the lancet body comprises a protrusion which is engaged with the recess.

17. The lancet assembly according to claim 1 wherein the lancet body and the connector are originally formed integrally.

18. The lancet assembly according to claim 1 wherein the connector comprises a protrusion,

when the spring is compressed, the protrusion of the connector abuts against a protrusion of the lancet holder so that forward movement of the connector is prevented, forming an abutment state, and

the trigger releases the abutment state.

19. The lancet assembly according to claim 1 wherein the spring comprises a protrusion,

when the spring is compressed, the protrusion of the spring abuts against a protrusion of the lancet holder so that forward movement of the connector is prevented, forming an abutment state, and

the trigger releases the abutment state.

20. The lancet assembly according to claim 1 wherein the lancet body comprises a protrusion,

when the spring is compressed, the protrusion of the lancet body abuts against a protrusion of the lancet holder so that forward movement of the connector is prevented, forming an abutment state, and

the trigger releases the abutment state.

21. The lancet assembly according to claim 1 wherein the arm comprises a guide pin, and

the lancet holder comprises a channel on an inner wall which guides said guide pin.

22. The lancet assembly according to claim 1 wherein the connector comprises a guide pin, and

the lancet holder comprises a channel on an inner wall which guides said guide pin.

23. The lancet assembly according to claim 1 wherein the base comprises a pair of the arms, and the spring is located between the arms.

24. The lancet assembly according to claim 19 wherein the connector, the lancet body or the spring comprises a protrusion which extends in a forward and oblique direction therefrom, and

when the trigger which moves forward with respect to the forward and oblique direction comes into contact with said protrusion and pushes said protrusion forward, the connector, the lancet body or the spring is pushed downward and the abutment state is released.

25. The lancet assembly according to claim 1 wherein a rear end of the spring is connected to a foot of the arm where the arm is attached to the base or to a vicinity of the foot in addition to or in place of to being connected to the base.

26. The lancet assembly according to claim 1 wherein a rear end of the trigger is connected to a foot of the arm where the arm is attached to the base or to a vicinity of the foot in addition to or in place of to being connected to the base.