JPH10192262A - Disposable pricker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts of a pricker to enable to easily assemble, by integrally forming a flexible arm on the middle part of a lancet and contacting and sliding the free end of the flexible arm on an engaging part in a case side to be elastically deformed when the lancet retreats in the axial direction against a spring means. SOLUTION: A case body 2 is a reverse funnel shape with the wide tip end and the narrow rear end and slidably carries a lancet 1 between the advancing and retreating positions. And an engaging opening is formed on a slope between the large diameter part and the small diameter part. A compressed coil spring 3 acts between the lancet and the case body to hold the lancet 1 at a halt position where the metallic needle point stays in the case body under a natural condition. The flexible synthetic resin arm 4a to constitute a part of the lancet 1 has a pair of free end at right and left elastically displaceable in the lateral direction against the axis line of the lancet, and the free ends are engaged with the engaging opening formed on the slope of the case body in a process the lancet retreats from the halt position to the retreating position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable plikka used for collecting a small amount of blood as a sample for testing diabetes or the like.

[0002]

2. Description of the Related Art Generally, an elongated housing holding a spring-loaded lancet so that the tip of the lancet is inside the housing, and a lancet held at a fully retracted position where potential energy is stored in spring means, And a trigger mechanism that releases the lancet to a temporary position where the lancet tip projects from the front end of the housing, and a cap that initially covers the lancet tip and whose head projects outside the housing, The cap is an elongate means for retracting the lancet. When retracted, the disposable puncture device (Tokuhei 7-505307, EPA0), which can be twisted and broken from the lancet to expose the tip,
No. 433050) is conventionally known.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disposable puncturing apparatus which has a small number of parts and is easy to assemble.

[0004]

A disposable plikka used for collecting a small amount of blood as a sample for a test of diabetes or the like, wherein a metal needle tip for puncturing a patient's skin and a separable covering tip thereof are provided. An elongated lancet integrally formed of a synthetic resin, including a cap, a housing for slidably holding the lancet in a front-rear direction, from a retreat position to a forward position beyond a rest position, and the lancet and the housing A spring means for maintaining the lancet so that the metal needle tip is in a rest position where the metal needle tip stays in the housing, and a retracted position which is retracted against the spring means. Locks the lancet and, when unlocked, allows the lancet to be fired by the action of the spring to a forward position where the needle tip temporarily projects a predetermined length from the front end of the housing. And trigger means A flexible arm constituting a trigger means is formed integrally with a locking part on the housing side at an intermediate portion of the lancet, and when the lancet is retracted in the axial direction against the spring means, the flexible arm is formed. Is slidably in contact with the locking portion on the housing side and elastically deforms in the lateral direction.

[0005]

Embodiment 1 In the embodiment shown in FIGS. 1 to 6, reference numeral 1 denotes an elongated lancet having a needle tip for puncturing the skin of a patient, a metal needle 1a and a cap 1 for protecting the needle tip.
b, and a flexible arm 4a to be described later, which are integrally insert-molded so as to cover the outside of the metal needle with a synthetic resin, and between the metal needle and the protective cap. Is formed with a weak portion 1c from which the cap is to be screwed off. Reference numeral 2 denotes an inverted funnel-shaped casing having a wide front end and a narrow rear end, which slidably supports the lancet between a forward position and a backward position, and locks the slope between the small diameter portion and the large diameter portion. An opening 4b is formed. Reference numeral 3 denotes a compression coil spring acting between the lancet and the housing, one end of which is fitted to a small-diameter portion of the housing, and the other end of which is fitted to a central portion of the lancet. The lancet is held at a rest position where the tip of the needle stays in the housing. 4
a is the flexible arm made of synthetic resin which constitutes a part of the lancet, and has a pair of left and right free ends that can be elastically displaced in the lateral direction with respect to the axis of the lancet, and the free end is a stop of the lancet. In the process of being retracted from the position to the retracted position, it engages with the locking opening 4b formed on the slope of the housing. Reference numeral 5 denotes a lid having a through hole at the center thereof through which the cap is inserted. After the lancet is assembled, the lid 5 is fitted and fixed to the wide end of the housing. The lid abuts the locking piece when the lancet is fired and moves to the advanced position, preventing further advancement of the lancet. If the distance between the front end of the housing and the skin is constant, the lid is not always necessary, and can be replaced by an obstacle such as a protrusion or a pin provided on the housing. . Also,
The flexible arm is not symmetrical, and may be provided on only one side.

[0006]

[Assembly] To assemble the precker according to this embodiment,
First, the compression coil spring 3 is pushed into the small diameter portion of the housing 2,
The tip is fitted and fixed to the housing by a suitable fitting means. Next, a lancet is inserted into this housing from the wide-end opening with the cap 1b facing backward (FIG. 2). The lancet then retreats, storing potential energy against the spring means. At this time, the flexible arm 4
The free end of a is temporarily elastically displaced in the lateral direction by sliding on the slope of the gradually narrowing inner wall surface of the housing, and then from the locking opening 4b provided on the slope of the housing to the outside of the housing. Protrude. Here, when the lancet is further pushed in, the rear end of the compression coil spring is fitted and fixed to the lancet by a suitable fitting means at the base of the flexible arm 4a. As a result, the compression coil spring has one end fitted to the small-diameter portion of the housing and the other end fitted to the lancet, and the lancet is locked to the housing at the retracted position against the compression coil spring. Becomes Finally, the assembly of the precker is completed by fitting and fixing the lid 5 to the front end opening of the housing (FIG. 3).

[0007]

[Operation] After the pliers assembled as described above are unscrewed from the lancet cap 1b from the weak portion 1c and the needle tip 1a is exposed (FIG. 4), When the free end of the flexible arm 4a of the lancet protruding outward from the stop opening 4b is operated inward, the engagement between the housing and the lancet is released, and the lancet is prevented from moving forward by the lid 5. To the advanced position to be moved forward by the action of the spring means (FIG. 5). Thereafter, the compression coil spring returns to its original length, and the lancet retracts to the rest position (FIG. 6).

[0008]

Embodiment 2 FIGS. 7 to 11 show another embodiment. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The most different point of this embodiment from the above embodiment is the mounting method of the spring means. That is, in the above-described embodiment, since there is one compression coil spring 3, one end of the compression coil spring is fitted and fixed to the housing side, and the other end is fitted and fixed to the lancet side. However, in the present embodiment, since the weak compression coil spring is provided as the auxiliary spring 32 on the opposite side of the lancet as well, the end of the main compression coil spring 31 is fitted simply by contacting the corresponding member. Absent. The auxiliary spring serves to hold the needle tip of the lancet in the housing in the rest state, and can be replaced with another spring material such as silicone rubber. In this embodiment, the trigger mechanism is released by pressing the rear end of the lancet,
The lancet is fired by the force of the compression coil spring 31.

[0009]

As described above, the present invention has a simple structure and can be assembled simply by inserting a lancet into a housing, thereby facilitating automatic assembly.

[Brief description of the drawings]

FIG. 1 is an exploded view of an embodiment of a precker according to the present invention.

FIG. 2 is a sectional view of the same before the assembly is completed.

FIG. 3 is a sectional view of the lancet in a retracted position after assembly is completed.

FIG. 4 is a cross-sectional view showing a state where the cap is similarly twisted at that position.

FIG. 5 is a cross-sectional view of a state in which the lancet has been fired to a forward position.

FIG. 6 is a sectional view showing a state where the lancet is in a rest position corresponding to the free length of the spring means.

FIG. 7 is an exploded view showing another embodiment.

FIG. 8 is a sectional view corresponding to FIG. 3;

9 is a sectional view corresponding to FIG.

FIG. 10 is a sectional view corresponding to FIG.

FIG. 11 is a sectional view corresponding to FIG. 6;

[Explanation of symbols]

 1. . . . . . Lancet 2. . . . . . Case 3, 31. . . Spring means 4. . . . . . Trigger means

Claims (2)

[Claims] 1. An elongated lancet 1 integrally formed of a synthetic resin including a metal needle tip for piercing a patient's skin and a separable cap covering the tip thereof, and the lancet is set in a retracted position in the front-rear direction. And a casing 2 slidably held from a rest position to an advanced position, and interposed between the lancet and the casing, so that the metal needle tip is usually at the rest position in the casing. A spring means 3 for maintaining the lancet
The lancet is locked at a retracted position where the lancet is retracted against the spring means, and when the lock is released, the needle point temporarily projects a predetermined length from the front end of the housing. And a trigger means 4 for allowing the lancet to be fired by the action of the spring. A flexible arm which constitutes the trigger means together with a locking part on the housing side is provided at an intermediate portion of the lancet. When the lancet is retracted in the axial direction against the spring means, the free end of the flexible arm slides on the locking portion on the housing side and elastically deforms in the lateral direction. Disposable plikka characterized by the following. 2. The lancet according to claim 2, wherein the engagement is released by pushing a rear end of the lancet protruding from a rear end of the housing in the retracted position, whereby the lancet is fired. Item 1. A disposable plikka according to Item 1.