Lancet Assembly and Pricking Device

• US 20090299398A1
• Filed: 06/05/2007
• Published: 12/03/2009
• Est. Priority Date: 06/13/2006
• Status: Abandoned Application

• Current Assignee: Izumi-Cosmo Co., Ltd.
• Original Assignee: Izumi-Cosmo Co., Ltd.
• Inventors: Yoritaka, Kitamura, Kazuharu, Seki, Teruyuki, Abe
• Application Number:
  US12/308,131
• Publication Number:
  US 20090299398A1
• 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 5/150564 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 5/150648 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 5/150725 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 5/150893 by indicating if used, tampered with, unsterile or defective
• 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 5/1519 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

There is provided the pricking device that allows it to load the unspent lancet assembly into the injector, and that inhibits loading of the unspent lancet assembly into the injector. The pricking device has the notched portion formed on the edge of the opening end of the lancet holder, and the plate spring component is provided on the inner wall of the housing of the injector. One end of the plate spring component is secured to the injector housing, whereas the other end of plate spring component is free end, and the tip end portion of the free end being provided with the hook-shaped portion. In the spent lancet assembly, the notched portion engages with the hook-shaped portion so that the loading becomes impossible. In the unspent lancet assembly in which the lancet body is secured to the lancet holder such that the protrusion of the lancet body is located rearward with respect to the notched portion, the protrusion serves to expand the free end outwardly so that the notched portion does not engage with the hook-shaped portion. As a result, the unspent lancet assembly can be inserted into the injector.

Claims

1. A pricking device comprising a lancet assembly and an injector;

wherein the lancet assembly comprising a lancet and a lancet holder that houses the lancet, wherein the lancet comprises a lancet body, a lancet cap and a pricking component in which the lancet body and the lancet cap are made of resin and the pricking component is made of metal, the pricking component is situated in both of the lancet body and the lancet cap, the tip of the pricking component is covered with the lancet cap, and the lancet cap and the lancet body are integrally connected together by a bridging component;

wherein the injector used in combination with the lancet assembly is capable of launching the pricking component, the injector comprising a plunger that is capable of engaging with the rear end portion of the lancet body, and thus capable of launching the lancet body in the pricking direction;

a lancet cap removing part that is capable of making contact with the lancet cap; and

a trigger lever that is pressed to launch the pricking component, wherein the lancet assembly can be loaded into the injector by inserting the lancet holder into the injector through a front end opening of the injector;

wherein the lancet holder has a notched portion formed on an edge of the opening end thereof, whereas a plate spring component made of metal is provided on the inner wall of an injector housing at the front side of the injector,

the one end of the plate spring component is attached to the inner wall of the injector housing, whereas the other end of the plate spring component is a free end with a hook-shaped portion formed in the tip region thereof, and

when the spent lancet assembly whose lancet body has been launched in the pricking direction is inserted through the front end opening of the injector, the notched portion of the lancet holder engages with the hook-shaped portion of the plate spring component, and thereby a further insertion of the lancet holder into the injector is prevented.

2. The pricking device according to claim 1, wherein

a rear portion of the lancet body is provided with a protrusion that extends transversely;

when an unspent lancet assembly wherein the lancet body is secured to the lancet holder such that the protrusion of the lancet body is located rearward with respect to the notched portion of the lancet holder, is inserted through the front end opening of the injector, the protrusion of the lancet body outwardly presses and expands the free end of the plate spring component so that the notched portion of the lancet holder does not engage with the hook-shaped portion of the plate spring component, which enables the unspent lancet assembly to be inserted into the injector.

3. The pricking device according to claim 2, wherein

a rear side of the protrusion of the lancet body is chamfered;

and

the surface of the chamfered rear side is capable of making contact with the tip end portion of the free end of the plate spring component, and thereby the free end of the plate spring component can expand outwardly upon being pressed.

4. The pricking device according to claim 1, wherein

the main body of the plate spring component extends parallel to the inner wall surface of the injector housing, whereas the hook-shaped portion of the plate spring component extends in the direction perpendicular to the inner wall surface of the injector housing.

5. The pricking device according to claim 1, wherein

a pair of the plate spring components are provided on opposing inner walls of the injector housing, whereas a pair of the notched portions are provided on opposing edges of the opening end of the lancet holder.

6. The pricking device according to claim 1, wherein

two hook-shaped portions are provided on opposing peripheral portions at a tip end region of the free end of the plate spring component, whereas two notched portions are formed in the edges of the opening end of the lancet holder such that the two notched portions correspond to the two hook-shaped portions.

7. The pricking device according to claim 1, wherein

the lancet holder has, on its inner wall, a guide for guiding the lancet body along the pricking direction;

the protrusion of the lancet body is guided by the guide of the lancet holder upon the launching the lancet body in the pricking direction.

8. A pricking device comprising a lancet assembly and an injector;

wherein the lancet assembly comprising a lancet and a lancet holder that houses the lancet wherein the lancet holder has a locking protrusion on its outer wall surface such that it is located adjacent to an opening end thereof, the lancet comprises a lancet body, a lancet cap and a pricking component in which the lancet body and the lancet cap are made of resin and the pricking component is made of metal, the pricking component is situated in both of the lancet body and the lancet cap, the tip of the pricking component is covered with the lancet cap, and the lancet cap and the lancet body are integrally connected together by a bridging component;

wherein the injector used in combination with the lancet assembly is capable of launching the pricking component, wherein the injector comprises a plunger that is capable of engaging with the rear end portion of the lancet body, and thus capable of launching the lancet body with the pricking component in the pricking direction;

a lancet cap removing part that is capable of making contact with the lancet cap; and

a trigger lever that is pressed to launch the pricking component, a holder locking component provided on the inner wall of an injector housing at the front side of the injector, and provided with a stopper A which protrudes from a surface S thereof toward the inside of the injector, wherein the lancet assembly can be loaded into the injector by inserting the lancet holder into the injector through a front end opening of the injector;

wherein a front end of the holder locking component is pivoted on the inner wall surface of the injector housing whereas a rear end of the holder locking component is a free end;

a spring is provided between the holder locking component and a side wall surface of the injector housing so that a inward force toward the inside of the injector is exerted on the holder locking component;

when the lancet assembly is inserted through the front end opening of the injector, the locking protrusion of the lancet holder slides on the holder locking component and then the locking protrusion rides over the stopper A, and thereby the locking protrusion and the stopper A can make contact with each other so that the inserted lancet holder does not come off the injector.

9. The pricking device according to claim 8, wherein

a stopper B protruding toward the inside of the injector is provided rearward with respect to the stopper A on the surface S of the holder locking component;

after the riding of the locking protrusion over the stopper A upon the further insertion of the lancet holder into the injector, the locking protrusion rides over the stopper B so that the lancet holder moves to a position where the lancet body is ready to be launched in the pricking direction, and thereby the locking protrusion and the stopper B can make contact with each other.

10. The pricking device according to claim 9, wherein

the rear end portion of the lancet body has an engagement portion that is capable of engaging with a plunger provided in the injector;

the rear end portion of the lancet body and the front end portion of the plunger engage with each other when the lancet assembly is loaded into the injector through the front end opening of the injector, and thereby the plunger is retracted so that the force required for launching the pricking component is stored in the plunger; and

while the lancet assembly is inserted until the force required for launching the pricking component is stored in the plunger, the locking protrusion rides over the stopper B of the holder locking component and thereby the locking protrusion and the stopper B can make contact with each other.

11. The pricking device according to claim 9, wherein

the locking protrusion of the lancet holder and the stopper A and/or the stopper B of the holder locking component respectively have flat surfaces through which the locking protrusion makes complementary contact with the stopper A and/or the stopper B upon the sliding of the locking protrusion on the stopper A and/or the stopper B.

12. The pricking device according to claim 8, wherein

the injector further comprises an ejector;

the ejector presses the lancet holder and the lancet body forward when the ejector is caused to slide forward, and thereby the lancet assembly is ejected from the injector.

13. The pricking device according to claim 12, wherein

the ejector has a pair of pressing wing parts extending forward;

each tip of the pressing wing parts makes contact with both of the edge of the opening end of the lancet holder and the rear end portion of the lancet body, and thereby both of the lancet holder and the lancet body are simultaneously pushed forward.

14. The pricking device according to claim 13, wherein the tips of the pair of pressing wing parts are respectively bent inwardly.

15. The pricking device according to claim 14, wherein the plunger of the injector has a groove on its side;

an edge portion of the pressing wing part of the ejector is guided along the groove when the ejector is caused to slide forward.

16. The pricking device according to claim 9, wherein

the holder locking component further has a release part A and/or a release part B on its side;

the ejector further has a releasing part capable of making contact with the release part A and/or the release part B; and

when the ejector is caused to slide forward, the releasing part slides on the release part A and/or the release part B, causing the holder locking component to move outwardly while rotating around the front end thereof, and thereby a contact-enabled state between the locking protrusion of the lancet holder and the stopper A and/or B of the holder locking component ceases.

17. The pricking device according to claim 16, wherein the release part A and the stopper A are located adjacent to each other in the holder locking component;

and/or

the release part B and the stopper B are located adjacent to each other in the holder locking component.

18. The pricking device according to claim 16 or 17, wherein

when the ejector is caused to slide forward, both of the lancet holder and the lancet body are simultaneously pushed forward and the contact-enabled state between the locking protrusion of the lancet holder and the stoppers A and/or B of the holder locking component ceases, and thereby the lancet assembly can be discharged from the injector.

19. The pricking device according to claim 8, wherein

the injector further comprises an indicator component in which the front end of the indicator component is pivoted on the trigger lever whereas the rear end of the indicator component is provided with an indicating portion;

and

when the lancet assembly is inserted to a position where the lancet body is ready to be launched in the pricking direction, the edge of the opening end of the lancet holder pushes a holder-contact region of the indicator component so that the indicator component swivels around the front end thereof, causing the indicating portion to move to a position where a window is formed in the injector housing.

20. The pricking device according to claim 8, wherein

the injector has a trigger locking component provided at the front end of the trigger lever;

a part of the trigger locking component extends through an opening of the injector housing, and the trigger locking component is capable of sliding on the trigger lever forward or backward within the opening of the injector housing; and

the trigger locking component is provided with a spring for forcing the trigger locking component to move forward so that the trigger locking component is located at the front position of the opening of the injector housing, as long as the force is not applied to the trigger locking component, in which case a locking part provided at the bottom of the trigger locking component can make contact with a lock part provided on the inner wall of the injector housing so that the trigger locking component cannot be pressed into the injector, and thereby the trigger lever cannot be pressed into the injector;

in a case where the force is applied to the trigger locking component against the forward force, causing the trigger locking component to move backward within the opening of the injector housing, a contact-enabled state between the locking part of the trigger locking component and the lock part provided on the inner wall of the injector housing ceases, enabling the trigger locking component to be pressed into the injector, and thereby the trigger lever can be pressed into the injector.

21. A lancet assembly comprising a lancet and a lancet holder that houses the lancet, wherein

the lancet comprises a lancet body, a lancet cap and a pricking component in which the lancet body and the lancet cap are made of resin and the pricking component is made of metal, the pricking component is situated in both of the lancet body and the lancet cap, the tip of the pricking component is covered with the lancet cap, and the lancet cap and the lancet body are integrally connected together by a bridging component;

when the lancet cap is pressed in the pricking direction with the lancet body attached to the lancet holder, the bridging component is broken so that the lancet cap is separated from the lancet body, and thereby the tip of the pricking component is exposed while the pricking component remains situated in the lancet body;

when the separated lancet cap is pressed further in the pricking direction, the separated lancet cap moves to a position that is off the pricking pathway of the pricking component;

wherein the lancet holder has two securing bosses formed within a securing groove formed on the inner wall thereof whereas the lancet body has a securing protrusion that slots into the securing grooves;

the lancet body is secured to the lancet holder by locating one securing protrusion between the two securing bosses;

wherein the lancet holder has a guide on its inner wall, and the lancet body has a guided protrusion; and

when a contact between the bosses and the securing protrusion ceases by pressing the lancet body, the guided protrusion can move along the guide so that the lancet body is guided along the pricking direction.

22. The lancet assembly according to claim 21, wherein

the securing protrusion extends in the transverse direction of the lancet body along flat surface A that includes the center axis of the lancet;

and

the guided protrusion extends in the transverse direction of the lancet body along flat surface B that is parallel to the flat surface A.

23. The lancet assembly according to claim 21, wherein

the lancet cap is capable of making contact with a lancet cap removing part that is provided in an injector for launching the pricking component;

the lancet cap removing part makes contact with the lancet cap when the lancet holder with the lancet body secured thereto is inserted into the injector;

when the lancet holder is further inserted while the lancet cap removing part and the lancet cap are still in contact with each other, the force for pressing the lancet cap in the pricking direction is generated so that the bridging component is broken and the lancet cap is separated from the lancet body, and thereby the tip of the pricking component is exposed while the pricking component remains situated in the lancet body; and

,

when the lancet holder is furthermore inserted, the separated lancet cap moves to the position that is off the pricking pathway within-the lancet holder.

24. The lancet assembly according to claim 23, wherein

the lancet body has a pair of wing parts extending backward, each tip of the wing parts being provided with a contact portion;

in the spent lancet assembly that has been ejected from the injector after pricking, the contact portion of each wing part can make contact with a stopper surface provided within the lancet holder so that the tip of the pricking component does not protrude from the pricking opening.

25. The lancet assembly according to claim 23, wherein

as to the two securing bosses of the lancet holder, a front side of boss A located forward with respect to the other boss forms a flat surface facing forward;

after the lancet cap is separated from the lancet body upon the loading of the lancet assembly into the injector, the plunger is prevented from being retracted further, so that the lancet body being in engagement with the plunger is prevented from being further inserted; and

thereafter, when the lancet holder is forced to move further in the direction of insertion, the contact between the securing boss of the lancet holder and the securing protrusion ceases, and thereby the lancet body can move in the pricking direction; and

when the lancet body is ready to be launched, the securing protrusion of the lancet body can make contact with the front side of the boss A of the lancet holder, and thereby the lancet body does not come off the lancet holder.

26. The lancet assembly according to claim 21, wherein

the lancet cap has an indicating part that protrudes in the transverse direction thereof, and the lancet holder has, in its wall, a slit extending in the longitudinal direction thereof;

when the separated lancet cap moves to a position that is off the pricking pathway within the lancet holder, the indicating part moves along the slit.

27. The lancet assembly according to claim 26, wherein,

when the separated lancet cap moves to a position that is off the pricking pathway within the lancet holder, the securing protrusion of the lancet body moves along the slit of the lancet holder.