JP2005124997A - Puncture tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a puncture tool which mitigates the pain of a patient as much as possible. <P>SOLUTION: The puncture tool is constituted to contain a needle unit holder 120, which keeps a needle unit 119 detachably and attachably at the end and slidably keeps a needle pushing bar 123 for pushing the needle unit forward, in a housing 101 in a manner that the needle unit holder 120 freely moves back and forth relative to the housing. In the puncture tool, a puncture needle 125 of the needle unit appears and disappears through a needle passing opening 111 at the end of the housing, and an end cover 176 having a plurality of pointed parts 178 sharpened forward on the end surface is provided on the front end part of the housing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a puncture device used when blood is taken from a living body part such as a fingertip during a blood test, for example.

In recent years, the number of diabetic patients has been increasing, and patients themselves can measure blood glucose levels using a blood glucose meter.
Management methods are becoming mainstream. In measurement, the patient takes blood for measurement from his / her fingertip. At this time, the needle is inserted into the skin of the fingertip using a puncture tool equipped with a puncture needle, and the blood is squeezed out by pressing around the puncture portion.

In the conventional puncture device, a plunger having a puncture needle at the tip is advanced by a single coil spring in the housing, and the needle is punctured on the fingertip surface. However, with this structure, if the biasing force of the spring is adjusted so as to give a large protruding force to the needle during puncturing, the needle becomes difficult to return into the housing, and conversely, puncturing is possible when the needle surely returns into the housing. Since a large protruding force cannot be obtained, it is inconvenient and painful to the patient.

Recently, a puncture device having a configuration in which a plunger provided with a puncture needle is urged using separate springs in the front end direction and the rear end direction has been proposed and is commercially available (see Patent Document 1). However, even with this puncture device, the patient is painful when puncturing.

There is also a proposal that the tip of the housing containing the lancet pushing mechanism is formed in a ring shape, and this ring-like tip is pressed against the fingertip of the patient to give a weak stimulus, thereby dispersing and relieving pain caused by the puncture needle ( Patent Document 2). However, a satisfactory pain relieving effect cannot be exhibited with such a ring shape.
JP 2000-245717 A [Description of Embodiment] and FIG. FIG. 1 is a column of [Embodiment of the invention] in Japanese Patent Application Laid-Open No. 11-164825 and FIG.

The subject of this invention is providing the puncture tool which can relieve the pain which a patient suffers as much as possible in view of said actual condition.

Throughout the claims and the entire specification, the front or distal direction refers to the direction in which the needle protrudes from the puncture device during puncture, that is, the left direction in FIG.

The puncture device according to the present invention has been devised to solve the above-mentioned problems, and in the puncture device in which the puncture needle (125) is provided on the distal end surface so as to protrude or freely protrude, the distal end surface is sharpened forward. A large number of pointed portions (178) are provided.

A preferred puncture device according to the present invention is a needle unit having a needle pusher bar (123) slidably holding a needle unit (119) at the tip in a housing (101) and pushing the needle unit forward. In the puncture device in which the holder (120) is housed so as to be movable back and forth with respect to the housing, and the puncture needle (125) of the needle unit is retracted through the needle passage hole (111) at the tip of the housing,
A tip cover having a large number of pointed projections (178) pointed forward on the tip surface at the front end of the housing (
176) is provided.

The shape of the pointed portion is preferably conical or pyramidal. The height of the pointed portion is preferably 0
. It is 3-0.7 mm, More preferably, it is 0.4-0.6 mm. The height of many puncture devices may be uniform or random. The number of pointed portions is preferably 5
50, more preferably 8-35. The arrangement of the pointed protrusions on the tip surface of the tip cover may be random or may have a specific pattern. This pattern is concentric,
It may be radial.

In this invention, since the tip surface is provided with a large number of pointed protrusions forward, when the tip surface is pressed against the fingertip of the patient and the tip of the puncture needle is pierced with the fingertip, The pointed portion gives a weak stimulus to the fingertip, whereby the pain caused by the puncture needle can be effectively dispersed, and the pain experienced by the patient can be alleviated as much as possible.

  Next, the present invention will be specifically described based on the illustrated embodiment.

1-3, the housing (101) includes a trunk cylinder (115) and a trunk cylinder (115) as main components.
A cap (112) that is detachably provided at the tip of the needle and has a needle passage hole (111) in the center of the tip surface
A body cover (117) externally mounted on the body cylinder (115) and having a push button (116), and a body cylinder (11
5) It is composed of a charge case (118) provided at the rear end portion so as to be movable back and forth with respect to the barrel.

In the housing (101), the needle unit (119) is detachably held at the tip, and the needle unit (1
A needle unit holder (120) having a needle pusher bar (123) that pushes 19) forward is slidably accommodated in the housing. The needle unit (119) has a cylindrical shape, and a puncture needle (125) is attached to the center of the distal end surface in a forward protruding manner. The second half of the needle unit (119) (104
) Is a bottomed cylindrical unit holding part (162) formed at the front end of the needle unit holder (120).
It is contained within.

A main spring that urges the holder forward between the barrel (115) and the needle unit holder (120) to project the puncture needle (125) of the needle unit (119) from the needle passage hole (111). Is installed,
Between the needle unit holder (120) and the charge case (118), urge the holder backward,
An auxiliary spring for interposing the puncture needle (125) in the cap (112) by retracting the advanced needle unit holder is interposed.

The charge case (118) is retracted with respect to the trunk cylinder (115), thereby applying an urging force to advance the needle unit holder (120) to the main spring and attaching the needle unit holder to the auxiliary spring. Give power.

A gentle spiral groove (175) is formed on the outer peripheral surface of the small diameter portion of the tip of the cap (112), and an annular ring (174) for adjusting the needle protrusion having an inward protrusion (173) on the front end side portion is provided on the cap ( 112) is fitted over the small-diameter portion of the tip, and an inward projection (173) is disposed in the spiral groove (175) to constitute a cam mechanism. That is, by rotating the ring (174) with respect to the cap (112), the ring (174) is moved back and forth.
A tip cover (176) having a large number of pointed projections (178) on the tip surface and a needle passage hole (179) in the center of the tip wall is covered on the ring (174), and a circle is formed on the inner surface recess. An engagement protrusion (177) at the front end of the ring (174) is fitted. The needle passage hole (179) of the tip cover (176) is provided so as to overlap the needle passage hole (111) of the cap (112). Therefore, when the tip cover (176) is turned, the ring (17
4) rotates, the front cover (176) also moves back and forth with the back and forth movement of the ring (174), and the tip of the puncture needle (125) moves to the needle passage hole (111) of the cap (112) and the front cover ( The length protruding from the tip cover (176) through the needle passage hole (179) of 176) is adjusted.

  The puncture tool is operated as follows.

First, the second half (104) of the new needle unit (119) is placed in the unit holding part (162) of the needle unit holder (120) before the puncturing operation is started. The charge case (118) is at the most advanced position with respect to the trunk cylinder (115).

Next, when the charge case (118) is pulled rearward with respect to the barrel (115), the auxiliary spring is compressed accordingly, and the needle unit holder (120) is retracted and locked in place. ,
The main spring is also compressed. The urging force for moving the needle unit holder (120) forward is generated by the compression of the main spring, and the urging force for moving the needle unit holder backward is generated by the compression of the auxiliary spring.

Next, when the charged charge case (118) is released, the charge case (118)
Is advanced by the biasing force of the auxiliary spring, and returns to its original state.

In this state, the push button (116) is pressed to release the locking of the needle unit holder (120). As a result, the needle unit holder (120) is advanced by the forward biasing force of the main spring, and the puncture needle (125) of the needle unit (119) is moved to the needle passage hole (111) and the tip cover (176) of the cap (112). A predetermined length is projected forward from the tip cover (176) through the needle passage hole (179), and is stabbed into the skin of the fingertip. At that time, the numerous pointed portions (178) of the tip cover (176) cause a weak stimulus to the fingertip, whereby the pain caused by the puncture needle (125) is dispersed and alleviated.

After puncturing, the needle unit holder (120) is retracted by the backward biasing force of the auxiliary spring, and the puncture needle (125) of the needle unit (119) is housed in the cap (112) and returns to its original state.

It is a perspective view of a puncture device. It is a perspective view which shows the decomposition | disassembly state of the front-end part of a puncture device. It is a vertical longitudinal cross-sectional view of the puncture device which shows a puncture state.

Explanation of symbols

(101): Housing
(119): Needle unit
(123): Needle push bar
(120): Needle unit holder
(125): Puncture needle
(111): Needle passage hole
(178): Pointed portion
(176): Tip cover

Claims (2)

A puncture device in which a puncture needle (125) is provided on a distal end surface so as to be protruded or retractable, and the puncture device is provided with a large number of pointed protrusions (178) pointed forward on the distal end surface. In the housing (101), a needle unit holder (120) having a needle pusher bar (123) that slidably holds the needle unit (119) at the tip and slidably pushes the needle unit forward is provided in the housing. In the puncture device which is housed so as to be movable back and forth, and the puncture needle (125) of the needle unit is retracted through the needle passage hole (111) at the tip of the housing
A tip cover having a number of pointed projections (178) pointed forward on the tip surface at the front end of the housing (
176).

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