Lumbar puncture needle

Abstract

To provide a lumbar spine puncture needle that indwells in a body without cutting a catheter.SOLUTION: A lumbar spine puncture needle includes: a needle hub extended in the longitudinal direction, and provided with an outer needle having a bending part and mounted thereon; an inner needle inserted into the outer needle from the needle hub so that the side face of the distal end of the outer needle may substantially be matched with the side face of the distal end; and a protective pipe with the lumen into which a catheter can be inserted. After the outer needle with the inner needle mounted thereon is inserted into the body, the inner needle is extracted from the outer needle, the bending part of the outer needle is followed from the needle hub in the outer needle left in the body, the protective pipe is inserted to extend ahead of the distal end of the outer needle, the catheter is inserted into the protective pipe from the proximal end side of the protective pipe, and the catheter is made to indwell in the body.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a lumbar puncture needle used for puncturing the lumbar spine and draining cerebrospinal fluid or blood in the brain.

Background Art

[0002] A lumbar puncture needle for puncturing the lumbar spine and draining cerebrospinal fluid or blood in the brain, that is, for guiding and discharging it to the outside using a drain or catheter, etc., is used by puncturing the lumbar spine and inserting a catheter up to around the neck. As shown in FIG. 3(a), the tip of the outer needle 203 of the lumbar puncture needle is bent to determine the insertion direction of the catheter 215.

[0003] Normally, the catheter 215 does not come into strong contact with the tip of the outer needle 203 during insertion or removal. However, as shown in FIGS. 3(b) and 3(c), there is a risk of damaging and cutting the catheter with the tip of the needle during the insertion operation, during retention, or during removal of the catheter 215. FIG. 3(b) shows a state where the catheter 215 hits the cutting edge 221 of the outer needle, and FIG. 3(c) shows a state where the catheter 215 hits the chin part 223 of the outer needle.

[0004] Therefore, Patent Document 1 discloses that in the needle tube of a medical anesthetic needle whose cutting edge is bent in a V shape, when the cutting edge faces forward, the annular cutting edge surface faces upward, and the needle axis is horizontal, the radial width behind the annular elliptical cutting edge surface surrounding the opening is made to be half or less of the radial width in front, and the rear inner peripheral edge part of the opening where the cutting edge surface and the inner peripheral surface intersect is cut off to provide a rear part, and the lower end edge where the rear part and the inner peripheral surface intersect forms an obtuse angle in a vertical cross section including the needle core.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, since the blade of the outer needle is made of a metal material and is sharp, and the catheter is made of a polymer material, there is a difference in hardness, and it is not possible to eliminate the risk of the catheter being cut by the blade tip. Therefore, the present invention aims to provide a lumbar puncture needle that does not have the risk of the catheter being cut by the blade tip of the outer needle. [Means for solving the problem]

[0007] The lumbar puncture needle of the present invention comprises: a needle hub having an outer needle attached thereto, the outer needle extending in a longitudinal direction and having a bent portion; an inner needle that is inserted into the outer needle from the needle hub so that an end face of a distal end of the outer needle and an end face of a distal end of the outer needle are approximately aligned; a protective pipe having a lumen through which a catheter can be inserted; Equipped with After the outer needle to which the inner needle is attached has been inserted into the body, the inner needle is removed from the outer needle; inserting the protective pipe, which follows the bent portion of the outer needle from the needle hub, into the outer needle remaining in the body so as to extend beyond the distal end of the outer needle; The catheter is inserted into the protective pipe from the proximal end side of the protective pipe, and the catheter is left in the body, which is a lumbar puncture needle. Effect of the Invention

[0008] The present invention provides a lumbar puncture needle that is free from the risk of damaging or cutting the catheter with the cutting edge of the outer needle. [Brief description of the drawings]

[0009]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying out the Invention

[0010] Hereinafter, various embodiments for carrying out the present invention will be described with reference to the drawings. The lumbar puncture needle described below is for embodying the technical idea of the present disclosure, and unless otherwise specifically described, the present disclosure is not limited to the following. For ease of explanation of the key points or understanding, the same reference numerals are used for convenience in different drawings. The sizes and positional relationships of the members shown in each drawing may be exaggerated in some cases for clarity of explanation.

[0011] (Description of Lumbar Puncture Needle) FIG. 1 shows (a) a lumbar puncture needle when inserting the outer needle into the body, (b) the outer needle, and (c) the inner needle according to an embodiment of the present invention. FIG. 2 shows (a) a state where a protection pipe and a catheter are passed through the outer needle and (b) an enlarged view of the needle tip of (a) according to an embodiment of the present invention. With reference to FIGS. 1 and 2, an embodiment of the lumbar puncture needle of the present invention will be described.

[0012] First, the side of the lumbar puncture needle inserted into the body will be referred to as the distal end, and the side where the medical staff operates the lumbar puncture needle will be referred to as the proximal end, and the following description will be made. FIG. 1(a) is a view of the lumbar puncture needle 101 when the inner needle 109 is attached to the outer needle 103 and the outer needle is inserted into the body. When the inner needle 109 is removed from this, as shown in FIG. 1(b), the outer needle 103 extends longitudinally from the proximal end to the distal end and includes a bent portion 107 for determining the direction of the catheter. The outer needle 103 is attached to the needle hub 105.

[0013] The inner needle 109 is shown in FIG. 1(c). The inner needle 109 is attached to the inner needle knob 111. As shown in FIG. 1(a), when inserting the lumbar puncture needle into the body, the inner needle 109 is inserted inside the outer needle 103, and the inner needle knob 111 of the inner needle 109 is fixed to the needle hub 105 of the outer needle 103. When the inner needle 109 is mounted on the outer needle 103 to insert the outer needle into the body, the end face of the distal end of the outer needle 103 and the end face of the distal end of the inner needle 109 approximately coincide.

[0014] The lumbar puncture needle according to the embodiment of the present invention includes a protection pipe 113 having a lumen into which a catheter 115 can be inserted. As shown in FIG. 1(a), after the outer needle 103 with the inner needle 109 mounted is inserted into the body, the inner needle 109 is removed from the outer needle 103, and instead of the inner needle 109, the protection pipe 113 is inserted into the outer needle 103. The protection pipe 113 is inserted into the outer needle 103 remaining in the body from the needle hub 105 and follows the bent portion 107 of the outer needle 103. As shown in FIG. 2(a), the protection pipe 113 is inserted until it extends beyond the distal end of the outer needle 103.

[0015] The protection pipe 113 is held by a protection pipe knob 117 at the proximal end. When the protection pipe 113 is inserted into the outer needle 103 and the protection pipe knob 117 engages and is fixed to the needle hub 105, the protection pipe 113 is fixed to the outer needle 103.

[0016] As shown in FIGS. 2(a) and (b), the catheter 115 is inserted into the protection pipe 113 from the proximal end side of the protection pipe 113, and the catheter 115 is left in the body. As shown in FIG. 2(b), since the catheter 115 does not come into contact with the tip of the outer needle 103 due to the protection pipe 113, the risk of damaging or cutting the catheter 115 with the cutting edge of the outer needle 103 can be eliminated.

[0017] The protection pipe 113 protrudes less from the outer needle 103 than the catheter 115. Therefore, it is less likely to be caught by the cutting edge or jaw of the outer needle 103, and there is no risk of the protection pipe 113 being cut by the outer needle 103.

[0018] The outer needle 103 and the inner needle 109 are preferably formed of a metal material for puncturing the body. On the other hand, the protective pipe 113 is preferably formed of a polymer material or a thin metal material, which is a soft material, so as to follow the bent portion 107 of the outer needle 103. The catheter 115 is preferably made of a polymer material so as to follow the bent portion 107 of the outer needle 103. The protective pipe 113 is formed of a polymer material harder than the catheter 115, so that the risk of being cut by the outer needle 103 is reduced. Further, the protective pipe 113 preferably has elasticity such that it does not break at the bent portion 107. The protective pipe 113 is preferably made as thin as possible so as not to increase the outer diameter of the outer needle 103, and is at least thinner than the catheter 115. Further, the protective pipe 113 is formed of a metal material harder than the catheter 115, so that it is not cut by the outer needle 103, and is formed of a metal material softer and thinner than the outer needle 103 so as to follow the bent portion 107.

[0019] After the catheter 115 is left in the body, the protective pipe 113 and the outer needle 103 are removed from the body with the protective pipe 113 extending beyond the distal end of the outer needle 103, so that the catheter 115 can be left in the body without being damaged or cut.

[0020] The present invention provides a lumbar puncture needle that does not risk damaging or cutting the catheter with the tip of the outer needle.

[0021] The description of the above embodiments is illustrative in all respects and not restrictive. Modifications and changes are appropriately possible for those skilled in the art. The scope of the present invention is indicated not by the above embodiments but by the claims. Further, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

Industrial Applicability

[0022] Using the lumbar puncture needle provided by the present invention, the catheter can be left in the body without being cut.

Explanation of Signs

[0023] 101 Lumbar puncture needle when inserting the outer needle into the body 103 Outer needle 105 Needle hub 107 Bend part 109 Inner needle 111 Inner needle knob 113 Protection pipe 115 Catheter 117 Protection pipe knob 203 Outer needle 215 Catheter 221 Blade tip of the outer needle 223 Jaw part of the outer needle

Claims

1. A needle hub to which an outer needle extending in the longitudinal direction and having a bent portion is attached, An inner needle inserted into the outer needle from the needle hub so that the end face of the distal end of the outer needle and the end face of the distal end are substantially coincident, A protective pipe having a lumen into which a catheter can be inserted, Comprising, After the outer needle with the inner needle attached is inserted into the body, the inner needle is removed from the outer needle, The protective pipe that follows the bent portion of the outer needle from the needle hub is inserted so as to extend beyond the distal end of the outer needle in the outer needle remaining in the body, A lumbar puncture needle, wherein the catheter is inserted into the protective pipe from the proximal end side of the protective pipe and the catheter is left in the body.

2. Comprising a protective pipe knob for holding the protective pipe at the proximal end of the protective pipe, When the protective pipe is inserted into the outer needle, the protective pipe knob engages with and is fixed to the needle hub, and the protective pipe is fixed to the outer needle. The lumbar puncture needle according to claim 1.

3. The outer needle and the inner needle are formed of a metal material, and the protective pipe is formed of a polymer material or a metal material. The lumbar puncture needle according to claim 1 or 2.

4. After the catheter is left in the body, the protective pipe and the outer needle are removed from the body while the protective pipe extends beyond the distal end of the outer needle. The lumbar puncture needle according to any one of claims 1 to 3.

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