JP2008194112A - Medical puncture needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical puncture needle which prevents an inserting article from being damaged by the opening edge of an outer needle or being stuck on the opening edge when the inserting article protruded from the outer needle is pulled back. <P>SOLUTION: Since a protection member 3 made of a material which is softer than the outer needle 1 is provided in a manner to cover the inside of the opening part 1a of the outer needle 1, the inserting article A makes contact with the protection member 3 and does not make contact with a cutting edge 1b of the opening part 1a of the outer needle 1 even if the inserting article A projecting out of the tip of the outer needle 1 is retracted. Consequently, the trouble that the inserting article A is damaged by the cutting part 1b of the outer needle 1 or is stuck on the cutting edge 1b is efficiently prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a medical puncture needle used for introducing a catheter into, for example, an epidural space or a blood vessel.

  Conventionally, as this type of medical puncture needle, a hollow outer needle having a blade formed at the opening edge of the distal end is provided, and an insert such as a catheter or a guide wire is inserted from the proximal end side of the outer needle punctured into the body. There is known one that is inserted, and the insert is protruded from the tip of the outer needle and introduced into the body (for example, see Patent Document 1).

In this medical puncture needle, for example, when used for epidural anesthesia, after puncturing the epidural space with the solid inner needle inserted into the outer needle, the inner needle is removed from the outer needle, A catheter is inserted from the proximal end side so as to protrude from the distal end of the outer needle to the epidural space, and the outer needle is removed to place the catheter. When placing a catheter in a blood vessel such as a vein or artery, insert a guide wire from the proximal end of the outer needle punctured into the blood vessel, and insert the guide wire from the distal end of the outer needle to the target position. After that, the outer needle is extracted, the catheter is introduced into the blood vessel along the guide wire, and the guide wire is extracted to place the catheter.
JP 2006-320526 A

  However, when an insert such as a catheter or a guide wire is protruded from the tip of the outer needle and then pulled back, the insert touches the blade of the outer needle and gets damaged, or it cannot be pulled back easily by being caught on the blade. There was a point.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is that even when the insert protruded from the outer needle is pulled back, the insert is damaged at the opening edge of the outer needle. An object of the present invention is to provide a medical puncture needle that is not caught.

  In order to achieve the above object, the present invention includes a hollow outer needle through which an insert such as a catheter and a guide wire can be inserted, and the insert is inserted from the proximal end side of the outer needle punctured into the body. In the medical puncture needle that introduces an insert into the body by projecting from the opening of the outer needle, a protective member made of a softer material than the outer needle is provided so as to cover the inside of the opening of the outer needle.

  As a result, the inside of the outer needle opening is covered with a protective member made of a softer material than the outer needle, so that the insert is protected even when the insert protruding from the tip of the outer needle is pulled back. It contacts the member and does not contact the edge of the opening of the outer needle.

  According to the medical puncture needle of the present invention, even when the insert protruded from the tip of the outer needle is pulled back, the insert does not contact the edge of the opening of the outer needle. It is possible to effectively prevent a problem that the needle is damaged or caught at the opening edge of the needle.

  FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 is a side view of a medical puncture needle, FIGS. 2 and 3 are perspective views thereof, and FIGS. FIG.

  This medical puncture needle includes a hollow outer needle 1 into which an insert A such as a catheter or a guide wire can be inserted, and a solid inner needle 2 inserted into the outer needle 1. A cylindrical protective member 3 is provided in 1.

  The outer needle 1 is made of a tubular member made of metal such as stainless steel, and its distal end is curved toward one side, and a blade 1b is formed at the edge of the opening 1a at the distal end. The proximal end side of the outer needle 1 is fixed to the hub 4, and the hub 4 is provided with gripping portions 4 a extending on both sides in the width direction.

  The inner needle 2 is made of a rod-shaped member made of metal such as stainless steel, and its distal end side is curved along the outer needle 1 and its distal end surface is flush with the distal end of the outer needle 1. The proximal end side of the inner needle 2 is fixed to the hub 5, and the hub 5 is provided with a grip portion 5 a extending in the axial direction.

  The protective member 3 is made of a material softer than the outer needle 1, such as a synthetic resin, and the distal end side thereof is curved along the outer needle 1, and the distal end opening edge thereof is flush with the distal end of the outer needle 1. Is formed. The protective member 3 has an outer diameter substantially equal to the inner diameter of the outer needle 1 and is formed so as to cover the inner peripheral surface of the outer needle 1. In this case, as long as the protective member 3 is fixed so as not to be displaced with respect to the outer needle 1, it is not necessarily fixed to the inner peripheral surface of the outer needle 1. Further, the protective member 3 formed in a cylindrical shape in advance may be inserted into the outer needle 1, but the protective member 3 is formed by coating the inner peripheral surface of the outer needle 1 with a synthetic resin. It may be.

  When inserting an insert A such as a catheter or a guide wire into the body using the medical puncture needle configured as described above, first, the inner needle 2 is inserted as shown in FIGS. After puncturing the outer needle 1 into the body, the inner needle 2 is removed from the outer needle 1 together with the hub 5. At that time, since the inner needle 2 has a small diameter, the curved shape on the distal end side is extracted while being elastically deformed linearly. Thereafter, as shown in FIGS. 3 and 5, the insert A is inserted from the proximal end side toward the distal end side of the outer needle 1, and protrudes from the opening 1 a of the outer needle 1 by a desired length. At that time, when the insert A is pulled back toward the proximal end side of the outer needle 1 when, for example, the insert A is protruded too much or the protruding direction is changed, the insert A is moved to the distal end as shown in FIG. However, since the insert A contacts the protective member 3 provided inside the opening 1 a of the outer needle 1, it does not contact the blade 1 b of the opening 1 a of the outer needle 1.

  Thus, according to the medical puncture needle of the present embodiment, the protective member 3 made of a softer material than the outer needle 1 is provided so as to cover the inside of the opening 1a of the outer needle 1, so that the outer needle 1 Even when the insert A protruded from the tip of the needle is pulled back, the insert A does not contact the protection member 3 and does not contact the blade 1b of the opening 1a of the outer needle 1, and the insert A does not contact the outer needle 1. It is possible to effectively prevent the problem that the blade 1b is damaged or caught on the blade 1b.

  In this case, since the protective member 3 is made of synthetic resin, the protective member 3 can be easily processed and the insert A can be reliably prevented from being scratched or caught by a synthetic resin softer than metal. be able to.

  Further, the outer needle 1 is formed so that the distal end is curved toward one side, the opening 1a is provided at the curved distal end, and the blade 1b is formed at the edge of the opening 1a. Due to the curved shape, for example, the catheter can be easily inserted into the epidural space, which is extremely advantageous when used for epidural anesthesia.

  In the above-described embodiment, the outer needle 1 is curved at the distal end side, but the present invention can also be applied to a straight tube that is not curved.

  7 and 8 are side cross-sectional views of the main part of the medical puncture needle showing the second embodiment of the present invention, and the other parts are the same as those in the above-described embodiment, and are not shown.

  The medical puncture needle shown in the figure includes a hollow outer needle 10 into which an insert A such as a catheter and a guide wire can be inserted, and a cylindrical protective member 11 is provided in the outer needle 10. Yes.

  The outer needle 10 is made of a metal member such as stainless steel, and its tip is sharply formed, and portions other than the tip are formed in a tubular shape. An opening 10 a that opens to the side is provided on the outer peripheral surface slightly proximal from the distal end of the outer needle 10, and the opening 10 a communicates with the distal end side of the inner space of the outer needle 10. In this case, the front end in the axial direction of the internal space is formed so as to be inclined downward toward the opening 10a.

  The protection member 11 is made of a soft material such as a synthetic resin as in the above-described embodiment. It is formed to be flush with. The protection member 11 has an outer diameter substantially equal to the inner diameter of the outer needle 10 and is formed so as to cover the inner side of the opening 10a of the outer needle 10 over the entire circumference.

  When inserting the insert A such as a catheter or a guide wire into the body using the medical puncture needle of the present embodiment, first, the outer needle 10 is punctured into the body, and then the insert A as shown in FIG. Is inserted from the proximal end side of the outer needle 10 toward the distal end side, and is protruded from the opening 10a of the outer needle 10 by a desired length. At that time, when the insert A is pulled back toward the proximal end side of the outer needle 10, the insert A contacts the opening edge of the outer needle 10 as shown in FIG. Since it contacts the protection member 11 disposed inside the portion 10a, it does not contact the edge of the opening 10a of the outer needle 10.

  As described above, according to the medical puncture needle of the present embodiment, the soft protection member 11 that covers the inner side of the opening 10a provided on the outer peripheral surface of the outer needle 10 so as to open toward one side is provided. Therefore, even in the configuration in which the insert A protrudes laterally from the opening 10a, the problem that the insert A is damaged at the opening edge or caught on the opening edge can be effectively prevented, as in the above embodiment. Can do.

  In addition, the outer needle 10 is formed so that the portion other than the tip portion is tubular, the opening portion 10a is provided on the outer peripheral surface, and the tip portion of the outer needle 10 is sharply formed. For example, a blood vessel such as a vein or an artery can be easily punctured, which is extremely advantageous when a guide wire is inserted into the blood vessel.

  In the above embodiment, the protective member 11 is formed so as to cover the inner side of the opening 10a of the outer needle 10 over the entire circumference. However, as shown in FIG. The formed protective member 12 may cover only a part of the opening 10a in the circumferential direction (the base end side of the outer needle 10). In this case, the front end surface of the protection member 12 is formed obliquely, and the front end abuts on the front end of the inner space of the outer needle 10, whereby the protection member 12 is partly in the circumferential direction of the opening 10 a by part of the circumferential direction. Is positioned so as to cover.

  That is, when the insert A protruded from the opening 10a of the outer needle 10 is pulled back, the insert A normally comes into contact with the proximal end side of the outer needle 10 in the opening 10a. It can be simplified. The insert A may come into contact with the distal end side of the outer needle 10 in the opening 10a, but the distal end of the inner space of the outer needle 10 communicating with the opening 10a forms an obtuse angle at the edge of the opening 10a. Since it is formed diagonally, the insert A is less likely to come into contact with the distal end side of the outer needle 10 in the opening 10a and get damaged, or the insert A is not caught on the opening edge.

The side view of the medical puncture needle which shows the 1st Embodiment of this invention Perspective view of main part of medical puncture needle Perspective view of main part of medical puncture needle Side sectional view of the main part of a medical puncture needle Side sectional view of the main part of a medical puncture needle Side sectional view of the main part of a medical puncture needle Side surface sectional drawing of the principal part of the medical puncture needle which shows the 2nd Embodiment of this invention Side sectional view of the main part of a medical puncture needle Side surface sectional drawing of the principal part of the medical puncture needle which shows the modification of 2nd Embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Outer needle, 1a ... Opening part, 3 ... Protection member, 10 ... Outer needle, 10a ... Opening part, 11, 12 ... Protection member, A ... Insert.

Claims (4)

It is equipped with a hollow outer needle that can be inserted with an insert such as a catheter or a guide wire inside, and the insert is inserted from the proximal end side of the outer needle punctured into the body, and the insert protrudes from the opening of the outer needle. In the medical puncture needle introduced into the body
A medical puncture needle, wherein a protective member made of a softer material than the outer needle is provided so as to cover the inside of the opening of the outer needle. The outer needle is formed so that the tip side is curved toward one side, the opening is provided at the curved tip, and a blade is formed at the edge of the opening. Medical puncture needle. 2. The medical device according to claim 1, wherein the outer needle is formed so that a portion other than the distal end portion has a tubular shape, the opening portion is provided on an outer peripheral surface thereof, and the distal end portion of the outer needle is sharply formed. Puncture needle. The medical puncture needle according to claim 1, 2 or 3, wherein the protective member is made of a synthetic resin.

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