Lancet assembly

• US 7,883,523 B2
• Filed: 05/16/2005
• Issued: 02/08/2011
• Est. Priority Date: 05/17/2004
• Status: Expired due to Fees

• 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:
  US11/596,711
• Publication Number:
  US 20070225742A1
• Time in Patent Office: 2,094 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 5/150816 by tactile feedback, e.g. vibration
• CPC Class Codes: A61B 5/150916 by blocking components, e.g. piston, driving device or fluid passageway
• 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 5/15117 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 5/15144 comprising driving means, e.g. a spring, for retracting the piercing unit into the housing

Abstract

The present invention provides a lancet assembly which eliminates the need to remove a resin cover encapsulating a pricking element. Upon inserting a lancet structure into a lancet holder, a force which separates a lancet cover encapsulating the sharp tip portion of the pricking element from a lancet body is generated, and this force is allowed to act on the lancet cover and the lancet body to thereby expose, within the lancet holder, the sharp tip portion of the pricking element encapsulated by the lancet cover and to locate the opening of the lancet holder in front of the sharp tip portion of the pricking element.

Claims

1. A lancet assembly comprising:

a lancet structure including an ejector and a lancet; and

a lancet holder for holding the lancet structure, the lancet holder having a front end portion and a reverse tapered portion,

wherein the ejector includes an arm, a spring having a front end and a rear end, and a base attached to the arm and the spring, the spring having a connector provided at the front end and being connected to the base at the rear end,

wherein the lancet includes a lancet body, a lancet cover, and a pricking element, the lancet body being connected to the lancet cover, and the pricking element being disposed within the lancet body and the lancet cover such that a sharp tip portion of the pricking element is encapsulated by the lancet cover and such that the pricking element extends between the lancet body and the lancet cover, the lancet cover including a tapered portion,

wherein the lancet body is connected to the connector,

wherein an opening is provided at the front end portion of the lancet holder, the opening being configured to allow the sharp tip portion of the pricking element to pass therethrough, and wherein the lancet structure is configured to be inserted into the lancet holder such that the base moves toward the connector and the spring is compressed, and such that 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 encapsulated sharp tip portion of the pricking element.

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

3. The lancet assembly of claim 1, wherein the arm of the ejector constitutes a first arm, and the ejector includes a second arm, and

wherein said first arm and said second arm engage the lancet cover such that said lancet cover is separable from the lancet body, and such that movement of the ejector into the lancet cover automatically separates the lancet cover from the lancet body.

4. The lancet assembly of claim 1, wherein the arm of the ejector constitutes a first arm, and the ejector includes a second arm,

wherein the first arm and the second arm engage the lancet cover such that said lancet cover is separable from the lancet body, and such that movement of the ejector into the lancet cover automatically separates the lancet cover from the lancet body.

5. 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.

6. The lancet assembly according to claim 1, wherein said lancet cover and said lancet body are integrally connected by a weakened portion located therebetween.

7. The lancet assembly according to claim 1, wherein said pricking element is held within said lancet cover and said lancet body, said lancet cover and said lancet body being independent and separate members.

8. The lancet assembly according to claim 6, wherein said lancet cover is located in front of the arm;

and said lancet cover is configured to be separated, at the weakened portion, from said lancet body when the base is moved toward the connector to compress the spring while a front end portion of the arm is held in contact with a rear side of the lancet cover.

9. The lancet assembly according to claim 7, wherein said lancet cover is located in front of the arm;

and said lancet cover is configured to be moved forward relative to said lancet body when the base is moved toward the connector to compress the spring while a front end portion of the arm is held in contact with a rear side of the lancet cover.

10. The lancet assembly according to claim 1, wherein a front end portion of the arm is engaged with the lancet cover such that contact between the arm and the lancet cover is maintained by the arm after the lancet cover is separated from the pricking element.

11. The lancet assembly according to claim 10, wherein the front end portion of the arm has an inwardly bent hook-like portion and the lancet cover has a portion which is engaged with the hook-like portion of the arm.

12. The lancet assembly according to claim 1, wherein the removed lancet cover is arranged to be moved forward in an oblique direction by the arm which is moved forward, so that the opening of the front end portion of the lancet holder is located in front of the exposed pricking element.

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

14. The lancet assembly according to claim 1, wherein the lancet body and the lancet cover are formed integrally with each other by molding a resin while the pricking element is inserted.

15. The lancet assembly according to claim 6, wherein the weakened portion is formed as a notched portion;

and the lancet cover is separable from the lancet body and the pricking element by breaking the notched portion.

16. The lancet assembly according to claim 1, wherein the lancet body is formed in a shape complimentary to the connector and the connector is formed in a shape complimentary to the lancet body such that the lancet body can be engaged with the connector so as not to be separable in a pricking direction.

17. The lancet assembly according to claim 16, wherein the connector has a concave portion, and the lancet body has a convex portion which is engaged with said concave portion.

18. The lancet assembly according to claim 16, wherein the lancet body has a concave portion, and the connector has a convex portion which is engaged with said concave portion.

19. The lancet assembly according to claim 1, wherein the lancet body and the connector are originally formed integrally with each other.

20. The lancet assembly according to claim 1, wherein the lancet holder includes a trigger which fires the lancet body comprising the pricking element with the sharp tip portion exposed, and a projecting portion located in front of the trigger;

and the connector has a projecting portion,

whereby the projecting portion of the connector is brought into contact with the projecting portion of the lancet holder upon the compression of the spring such that the connector is inhibited from moving forward; and

the trigger is operable to release such contact.

21. The lancet assembly according to claim 1, wherein the lancet holder includes a trigger which fires the lancet body comprising the pricking element with the sharp tip portion exposed, and a projecting portion located in front of the trigger;

and the spring has a projecting portion,

whereby the projecting portion of the spring is brought into contact with the projecting portion of the lancet holder upon the compression of the spring such that the connector is inhibited from moving forward; and

the trigger is operable to release such contact.

22. The lancet assembly according to claim 1, wherein the lancet holder includes a trigger which fires the lancet body comprising the pricking element with the sharp tip portion exposed, and a projecting portion located in front of the trigger;

and the lancet body has a projecting portion,

whereby the projecting portion of the lancet body is brought into contact with the projecting portion of the lancet holder upon the compression of the spring such that the connector is inhibited from moving forward; and

the trigger is operable to release such contact.

23. The lancet assembly according to claim 1, wherein the arm has a guide pin;

and the lancet holder has, on an inner wall, a channel portion which leads the guide pin.

24. The lancet assembly according to claim 1, wherein the connector has a guide pin;

and the lancet holder has, on an inner wall, a channel portion which leads the guide pin.

25. The lancet assembly according to claim 1, wherein the arm of the ejector is a first arm and the ejector includes a second arm, and a spring is provided between the first arm and the second arm.

26. A lancet structure which is for the production of a lancet assembly, said lancet structure comprising:

an ejector; and

a lancet,

wherein the ejector includes an arm, a spring having a front end and a rear end, and a base attached to the arm and the spring, the spring having a connector provided at the front end and being connected to the base at the rear end,

wherein the lancet includes a lancet body, a lancet cover, and a pricking element, the lancet body being connected to the lancet cover, and the pricking element being disposed within the lancet body and the lancet cover such that a sharp tip portion of the pricking element is encapsulated by the lancet cover and such that the pricking element extends between the lancet body and the lancet cover, the lancet cover including a tapered portion,

wherein the lancet body is connected to the connector, and

wherein the lancet structure is configured to be inserted into a lancet holder such that the base moves toward the connector and the spring is compressed, and such that 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 a reverse tapered portion of the lancet holder, relative to the pricking element, which remains substantially in the same position, thereby exposing the encapsulated sharp tip portion of the pricking element.

32. The lancet assembly according to claim 26, 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 an opening in the lancet holder.

27. A lancet holder which is for the production of a lancet assembly including a lancet structure, wherein an opening is provided at a front end portion of said lancet holder, the opening being configured to allow a sharp tip portion of a pricking element of the lancet structure to pass therethrough, and

wherein the lancet holder is configured to receive the lancet structure therein such that a base of the lancet structure moves toward a connector of the lancet structure and a spring of the lancet structure is compressed, and such that a lancet cover of the lancet structure is separated from the pricking element of the lancet structure by movement in an oblique direction of the lancet cover by a tapered portion of the lancet cover being moved along a reverse tapered portion of the lancet holder, relative to the pricking element, which remains substantially in the same position, thereby exposing the encapsulated sharp tip portion of the pricking element.

33. The lancet assembly according to claim 27, 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.

28. A lancet which is for the production of a lancet structure, said lancet comprising:

a lancet body;

a lancet cover including a tapered portion; and

a pricking element,

wherein said lancet body is connected to said lancet cover, and said pricking element is disposed within said lancet body and said lancet cover such that a sharp tip portion of said pricking element is encapsulated by said lancet cover and such that said pricking element extends between said lancet body and said lancet cover, and

wherein said lancet is configured to be inserted into a lancet holder such that such that said lancet cover is separated from said pricking element by movement in an oblique direction of said lancet cover by said tapered portion of said lancet cover being moved along a reverse tapered portion of the lancet holder, relative to said pricking element, which remains substantially in the same position, thereby exposing the encapsulated sharp tip portion of said pricking element.

34. The lancet assembly according to claim 28, 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 an opening in the lancet holder.

29. An ejector which is for the production of a lancet structure, said ejector comprising:

an arm;

a spring having a front end and a rear end; and

a base attached to said arm and said spring,

wherein said spring has a connector provided at said front end and is connected to said base at said rear end, and

wherein said ejector is configured to be inserted into a lancet holder such that said base moves toward said connector and said spring is compressed, and such that a lancet cover of the lancet structure is separated from a pricking element of the lancet structure by movement in an oblique direction of the lancet cover by a tapered portion of the lancet cover being moved along a reverse tapered portion of the lancet holder, relative to the pricking element, which remains substantially in the same position, thereby exposing an encapsulated sharp tip portion of the pricking element.

35. The lancet assembly according to claim 29, 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 an opening in the lancet holder.

30. A kit of a lancet assembly which includes a lancet structure and a lancet holder, wherein:

the lancet structure includes an ejector and a lancet, and the lancet holder is provided for holding the lancet structure, the lancet holder having a front end portion and a reverse tapered

wherein the ejector includes an arm, a spring having a front end and a rear end, and a base attached to the arm and the spring, the spring having a connector provided at the front end and being connected to the base at the rear end,

wherein the lancet includes a lancet body, a lancet cover, and a pricking element, the lancet body being connected to the lancet cover, and the pricking element being disposed within the lancet body and the lancet cover such that a sharp tip portion of the pricking element is encapsulated by the lancet cover and such that the pricking element extends between the lancet body and the lancet cover, the lancet cover including a tapered portion,

wherein the lancet body is connected to the connector,

wherein an opening is provided at the front end portion of the lancet holder, the opening being configured to allow the sharp tip portion of the pricking element to pass therethrough, and wherein the lancet structure is configured to be inserted into the lancet holder such that the base moves toward the connector and the spring is compressed, and such that 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 encapsulated sharp tip portion of the pricking element.

36. The lancet assembly according to claim 30, 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.

31. A kit of a lancet structure which includes a lancet and an ejector, wherein the ejector includes an arm, a spring having a front end and a rear end, and a base attached to the arm and the spring, the spring having a connector provided at the front end and being connected to the base at the rear end,

wherein the lancet includes a lancet body, a lancet cover, and a pricking element, the lancet body being connected to the lancet cover, and the pricking element being disposed within the lancet body and the lancet cover such that a sharp tip portion of the pricking element is encapsulated by the lancet cover and such that the pricking element extends between the lancet body and the lancet cover, the lancet cover including a tapered portion, and

wherein the lancet structure is configured to be inserted into a lancet holder such that the base moves toward the connector and the spring is compressed, and such that 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 a reverse tapered portion of the lancet holder, relative to the pricking element, which remains substantially in the same position, thereby exposing the encapsulated sharp tip portion of the pricking element.

37. The lancet assembly according to claim 31, 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 an opening in the lancet holder.