Lancet Assembly

• US 20090275968A1
• Filed: 03/26/2007
• Published: 11/05/2009
• Est. Priority Date: 04/03/2006
• Status: Abandoned Application

• Current Assignee: Izumi-Cosmo Co., Ltd.
• Original Assignee: Izumi-Cosmo Co., Ltd.
• Inventors: Abe, Teruyuki, Seki, Kazuharu, Kitamura, Yoritaka
• Application Number:
  US12/225,877
• Publication Number:
  US 20090275968A1
• 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 5/150198 Depth adjustment mechanism at the proximal end of the carrier of the piercing element
• CPC Class Codes: A61B 5/150259 Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
• 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 5/150549 Protectors removed by rotational movement, e.g. torsion or screwing
• 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 5/150648 fully automatically triggered, i.e. the triggering of the protective sleeve does not require a deliberate action by the user such as terminating the contact with the patient's skin
• 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 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit
• CPC Class Codes: A61B 5/15194 fully automatically retracted, i.e. the retraction does not require a deliberate action by the user, e.g. by terminating the contact with the patient's skin

Abstract

In a lancet assembly including a lancet 200 and a lancet case 100 that houses a portion of the former,

• • the lancet is a molded article of a resin consisting of a lancet body 204, a lancet cap 206 and a pricking member 210 made of a metal, with the pricking member being disposed in the lancet body and the lancet cap while straddling over these members, and the distal end portion of the pricking member being enclosed by the lancet cap;
  • the lancet body has a protruding portion 212 and a stopper 213 located behind the protruding portion;
  • the lancet case includes a case body having a front end opening and a rear end opening, and a pair of wings disposed on opposing side surfaces of the case body; and
  • each wing has an abutting portion 122 that protrudes inward between its front end portion and its rear end portion, the front end portion is connected to the case body and the rear end portion is left free, and as a result, when the abutting portion receives a force acting outward, the wing elastically splays outward with the force.

Claims

1. A lancet assembly comprising a lancet and a lancet case that houses a portion of the former, wherein

the lancet is a molded article of a resin consisting of a lancet body, a lancet cap and a pricking member made of a metal, with the pricking member being disposed in the lancet body and the lancet cap while straddling over these members, and the distal end portion of the pricking member being enclosed by the lancet cap;

the lancet body has a protruding portion and a stopper located behind the protruding portion;

the lancet case comprises a case body having a front end opening and a rear end opening, and a pair of wings (or arms) disposed on opposing side surfaces of the case body (hence the wings extend along the side surfaces of the lancet case and define a portions of the side surfaces of the lancet case); and

each wing has a stopper that protrudes inward between its front end portion and its rear end portion, the front end portion is connected to the case body and the rear end portion is left free and, as a result, when the stopper receives a force acting outward, the wing elastically splays outward with the force.

2. The lancet assembly according to claim 1 wherein the lancet cap and the lancet body are integrally connected to each other via a weakened portion, and a rear portion of the lancet cap that is located in front of the weakened portion, the weakened portion and a front portion of the lancet body that is located behind the weakened portion are housed in the lancet case.

3. The lancet assembly according to claim 1 wherein the lancet cap and the lancet body are formed as independent members, and the rear portion of the lancet cap and the front portion of the lancet body are disposed in the lancet case.

4. The lancet assembly according to claim 1, wherein the protruding portion of the lancet body composed of a first protruding portion as a front portion and a second protruding portion as a rear portion which are separated from each other with respect to their front-back direction relationship.

5. The lancet assembly according to claim 1, wherein the lancet cap includes a protruding portion which protrudes outward, and a fitting portion which is able to be fit in the front end opening of the lancet cap is located behind the protruding portion.

6. The lancet assembly according to claim 1, wherein a rear portion of the fitting portion is comprises a portion in the form of narrowing rearward.

7. The lancet assembly according to claim 1, wherein an abutting portion of the wing is in the form of a step or an portion.

8. The lancet assembly according to claim 1, wherein the stopper of the lancet body is in the form of a claw or a fold-back which extends forward and obliquely from the lancet body.

9. The lancet assembly according to claim 1, wherein a side surface of the lancet case comprises a recess which receives the wing.

10. The lancet assembly according to claim 1, wherein a thickness of a wall portion which forms the case body and which is located in front of the wing is smaller than that of the other portion of wall portions which form the case body.

11. The lancet assembly according to claim 1, wherein one end surface of an end surface of an front end portion of the lancet body and an end surface of a rear end portion of the lancet cap has portions, tops of which form a hypothetical flat surface which extends perpendicular to an extending direction of the pricking element, and the other end surface forms a flat surface which extends perpendicular to the extending direction of the pricking element.

12. The lancet assembly according to claim 1, wherein the protruding portion of the lancet body abuts against a wall which defines the rear end opening of the case body when the lancet body is inserted in the lancet case through its front end opening and moved rearward in the lancet case.

13. The lancet assembly according to claim 1, wherein the stopper of the stopper abuts against a wall which defines the rear end opening of the case body when the lancet body is inserted in the lancet case through its front end opening and moved rearward in the lancet case, then the stopper of the lancet body gets out of the rear end opening of the case body, and then lancet body is moved forward in the lancet case.

14. The lancet assembly according to claim 1, wherein the lancet case comprises a portion which gets over a portion provided on an inside of a front end opening of an injector or a portion which fits in a recess provided on the inside of the front end opening of the injector.

15. The lancet assembly according to claim 1, wherein the lancet case is formed by injection molding of a resin, so that the front end portion of the wing is connected integrally to the case body.

16. The lancet assembly according to claim 1, wherein the lancet body comprises a rear end portion which fits in a front end portion of a plunger which launches the lancet, the rear end potion comprises a portion or a recess on the outside thereof, and the portion or the recess fits complementally in or with a recess or a portion provided in an inside of the front end portion of the plunger.

17. An injector onto which the lancet assembly according to claim 1, is positioned so as to launch the lancet body with a distal end portion of the pricking member being exposed, wherein

the injector comprises therein a wing splaying member which expands each wing outward, and

the wing splaying member is configured such that it expands each wing outward when the lancet assembly is inserted rearward into the injector through its front end opening.

18. The injector according to claim 17, wherein

the injector further comprises therein a plunger which launches the lancet body with the distal end portion of the pricking member being exposed,

when the lancet assembly is inserted through the front end opening of the injector to move rearward a rear end portion of the lancet body so that the rear end portion abuts against a front end portion of the plunger, and thereafter the lancet body is further moved rearward, the rear end portion of the plunger is fitted in and grasped by the front end portion of the plunger,

when the lancet body is further moved rearward thereafter, a trigger lever is in condition for being able to hold the plunger,

when the lancet body is further moved rearward thereafter, the wing splaying member expands the wings outward,

when a force to move the lancet body rearward is removed, loading of the lancet assembly into the injector is completed due to being in a launchable state.

19. The injector according to claim 17, wherein

the injector further comprises therein a wing splaying member and a plunger which launches the lancet body with the distal end portion of the pricking member being exposed,

when the lancet assembly is inserted through the front end opening of the injector to move rearward a rear end portion of the lancet body so that the rear end portion abuts against a front end portion of the plunger, and thereafter the lancet body is further moved rearward, the rear end portion of the plunger is fitted in and grasped by the front end portion of the plunger,

when the lancet body is further moved rearward thereafter, a trigger lever is in a condition for being able to hold the plunger while the splaying member expands the wings outward,

when a force to move the lancet body rearward is removed while being in the above condition, loading of the lancet assembly into the injector is completed due to being in a launchable state.

20. The injector according to claim 17, wherein the wing splaying member comprises a pair of members which form slopes.

21. The injector according to claim 20, wherein the pair of the members which form the slopes are wedge members having a tapered off form which are separated from each other.

22. The injector according to claim 17, wherein the injector further comprises an ejector which applies a forward force to the lancet case of the loaded lancet assembly.

23. The injector according to claim 22, wherein the ejector comprises an acting portion, which abuts against the rear end portion of the lancet case.

24. The injector according to claim 23, wherein the acting portion of the ejector abuts against a rear end portion of a side surface of the lancet case which side surface is adjacent to a side surface on which the wing is located.

25. The injector according to claim 17, wherein the plunger comprises a launching spring around itself between a portion provided around its intermediate portion and a rear partition provided in an injector housing,

the launching spring is compressed by the plunger which is moved rearward after the rear end portion of the lancet body is grasped by the plunger, and

when the portion of the plunger is moved rearward so get over a rear end of the trigger lever, the rear end of the trigger is located on a front side of the portion of the plunger, so that the trigger lever is in a condition for being able to hold the plunger.

26. The injector according to claim 18, wherein, in the launchable state, the protruding portion of the lancet cap which protruding outward is located separately from the front end opening of the case body, so that substantially whole of the fitting portion in the rear portion of the lancet cap located is located outside the front end opening of the case body.

27. The injector according to claim 18, wherein, in the launchable state, the protruding portion of the lancet cap which protruding outward is located separately from the front end opening of the case body, so that a portion of a narrowing form is located behind the front end opening of the case body.

28. The injector according to claim 17, wherein a lower edge of the trigger lever comprises a recess in front of its rear end, and a portion of the plunger is configured such that it fit in the recess before grasping the rear end portion of the lancet and after launching the lancet.

29. The injector according to claim 17, wherein a lower edge of the trigger lever comprises a portion in front of its rear end, and a portion of the plunger is configured such that it is stopped by the portion of the trigger lever before grasping the rear end portion of the lancet and after launching the lancet.

30. The injector according to claim 17, wherein

the injector comprises a pricking depth adjusting drum disposed behind a rear partition in an injector housing,

the plunger extends and terminates within the drum, and the drum is capable of rotating around the plunger,

the pricking depth adjusting drum comprises a ring-shaped member which is secured on the inside of the drum and which is rotatable around the plunger, and the length of the ring-shaped member in the pricking direction changes along its circumferential direction,

the rear end of the plunger has a hitting member that strikes the rear end surface of ring-shaped member in its portion along a circumferential direction of the ring-shaped member,

when the plunger moves forward for pricking, the hitting member on the rear end of plunger strikes a portion of the rear end surface of the ring-shaped member in the drum, and

said portion of the rear end surface of the ring-shaped member as an object which the hitting member strikes is able to be changed to the other portion by causing the ring-shaped member to rotate around the plunger by means of the drum rotation.

31. The injector according to claim 30, wherein the ring-shaped member comprises an impact buffering property.

32. The injector according to claim 30, wherein the pricking depth adjusting drum further comprises a drum rotation limiter which comprises a first cylindrical portion extending ahead of the rear partition while passing through the partition and a second cylindrical portion located ahead of the first cylindrical portion, and

the plunger extends in the pricking depth adjusting drum while passing through the drum rotation limiter, and the drum moves along a longitudinal direction of the plunger together with the drum rotation limiter, the first cylindrical portion is able to rotates in an opening of the rear partition, but the second cylindrical portion is not able to rotate in the opening.

33. The injector according to claim 32, wherein the first cylindrical portion is a front portion of the pricking depth adjusting drum which portion passes through the rear partition of the injector housing while extending forward, and the second cylindrical portion is fit around a circumference of the front portion of the pricking depth adjusting drum and comprises a cross section which is fitted into the opening of the rear partition.

34. A lancet which forms the lancet assembly according to claim 1.

35. A lancet case which forms the lancet assembly according to claim 1.

36. A kit of a lancet and a lancet case which are for the formation of the lancet assembly according to claim 1.

37. A pricking device which is formed of the lancet assembly according to claim 16 and an injector comprising a wing splaying member which expands each wing outward, and

the wing splaying member is configured such that it expands each wing outward when the lancet assembly is inserted rearward into the injector through its front end opening.

38. A kit of a pricking device comprising the lancet assembly according to claim 16, and an injector comprising a wing splaying member which expands each wing outward, and

the wing splaying member is configured such that it expands each wing outward when the lancet assembly is inserted rearward into the injector through its front end opening.