JP7709725B2 - lumbar puncture needle - Google Patents

Description

The present invention relates to a lumbar puncture needle that is inserted into the lumbar spine and used to drain cerebrospinal fluid and blood from the brain.

Lumbar puncture needles are used to puncture the lumbar spine and drain cerebrospinal fluid and blood from the brain, i.e., to guide and expel them from the body using a drain or catheter. They are used by puncturing the lumbar spine and inserting the catheter up to the neck. As shown in Figure 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.

Normally, the catheter 215 does not come into contact with the tip of the outer needle 203 strongly enough to be inserted into the catheter during insertion or removal, but as shown in Figures 3(b) and 3(c), there is a risk that the catheter 215 may be damaged or cut by the needle tip during insertion, placement, or removal of the catheter 215. Figure 3(b) shows the state where the catheter 215 comes into contact with the cutting edge 221 of the outer needle, and Figure 3(c) shows the state where the catheter 215 comes into contact with the jaw portion 223 of the outer needle.

Patent Document 1 discloses that in a medical anesthesia needle with a bent cutting edge, when the cutting edge faces forward and the annular cutting edge surface faces upward, and the needle shaft is held horizontal, the rear inner peripheral edge of the opening where the cutting edge surface and the inner peripheral surface intersect is cut away to provide a rear surface, so that the rear radial width of the annular elliptical cutting edge surface surrounding the opening is less than half the front radial width, and the lower edge where the rear surface intersects with the inner peripheral surface forms an obtuse angle in a vertical cross section including the needle center.

International Publication No. 98/40116

However, since the blade of the outer needle is made of a sharp metal material 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 blade cutting the catheter. 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 of the outer needle.

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.

The present invention provides a lumbar puncture needle that does not pose a risk of damaging or cutting the catheter with the cutting edge of the outer needle.

1A shows a lumbar puncture needle when inserting an outer needle into a body, (b) an outer needle, and (c) an inner needle according to an embodiment of the present invention. 1A shows a state in which a protective pipe and a catheter are passed through an outer needle, and FIG. 1B shows an enlarged view of the needle tip of FIG. 1A, according to an embodiment of the present invention. (a) A conventional lumbar puncture needle; (b) a catheter abutting the cutting edge of the outer needle; and (c) a catheter abutting the jaw of the outer needle.

Various embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the lumbar puncture needle described below is intended to embody the technical ideas of the present disclosure, and unless otherwise specified, the present disclosure is not limited to the following. For the sake of ease of explanation or understanding of the main points, the same reference numerals are used in different drawings for convenience. The size and positional relationship of the components shown in each drawing may be exaggerated for clarity of explanation.

(Explanation of lumbar puncture needle)
Fig. 1 shows (a) a lumbar puncture needle when inserting an outer needle into a body, (b) an outer needle, and (c) an inner needle according to an embodiment of the present invention. Fig. 2 shows (a) a state in which a protective 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. An embodiment of the lumbar puncture needle of the present invention will be described with reference to Figs. 1 and 2.

First, the side of the lumbar puncture needle that is inserted into the body is referred to as the distal end, and the side where the medical professional operates the lumbar puncture needle is referred to as the proximal end. Fig. 1(a) is a diagram 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 in the longitudinal direction from the proximal end to the distal end and has a bent portion 107 for determining the direction of the catheter. The outer needle 103 is attached to a needle hub 105.

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 a 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 attached to the outer needle 103 so as 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 roughly coincide with each other.

The lumbar puncture needle according to the embodiment of the present invention includes a protective pipe 113 having a lumen into which a catheter 115 can be inserted. As shown in FIG. 1(a), after the outer needle 103 to which the inner needle 109 is attached is inserted into the body, the inner needle 109 is removed from the outer needle 103, and the protective pipe 113 is inserted into the outer needle 103 in place of the inner needle 109. The protective 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 protective pipe 113 is inserted until it extends beyond the distal end of the outer needle 103.

The protective pipe 113 is held at the proximal end by the protective pipe knob 117. The protective pipe 113 is inserted into the outer needle 103, and the protective pipe knob 117 engages and is fixed to the needle hub 105, thereby fixing the protective pipe 113 to the outer needle 103.

As shown in Figures 2(a) and (b), the catheter 115 is inserted into the protective pipe 113 from the proximal end side of the protective pipe 113, and the catheter 115 is left in the body. As shown in Figure 2(b), the protective pipe 113 prevents the catheter 115 from coming into contact with the tip of the outer needle 103, eliminating the risk of the catheter 115 being damaged or cut by the cutting edge of the outer needle 103.

The protective pipe 113 protrudes less from the outer needle 103 than the catheter 115. This makes it less likely to get caught on the cutting edge or jaws of the outer needle 103, and there is no risk of the protective pipe 113 being cut by the outer needle 103.

The outer needle 103 and the inner needle 109 are preferably made of a metal material to puncture the body. On the other hand, the protective pipe 113 is preferably made 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 preferably made of a polymer material harder than the catheter 115, so that the risk of being cut by the outer needle 103 is reduced. In addition, the protective pipe 113 is preferably elastic enough not to break at the bent portion 107. The protective pipe 113 is preferably formed as thin as possible so as not to increase the outer diameter of the outer needle 103, and is preferably formed at least thinner than the catheter 115. In addition, 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 that it follows the bent portion 107.

After the catheter 115 is placed in the body, the protective pipe 113 and the outer needle 103 are removed from the body while the protective pipe 113 is still extended beyond the distal end of the outer needle 103, allowing the catheter 115 to be placed in the body without damaging or cutting the catheter 115.

The present invention provides a lumbar puncture needle that does not pose a risk of damaging or cutting the catheter with the cutting edge of the outer needle.

The above-described embodiments are illustrative in all respects and are not restrictive. Those skilled in the art may make appropriate modifications and variations. The scope of the present invention is defined by the claims, not the above-described embodiments. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope of the claims and the scope equivalent thereto.

Using the lumbar puncture needle provided by the present invention, a catheter can be placed in the body without cutting it.

101: Lumbar puncture needle for inserting the outer needle into the body 103: Outer needle 105: Needle hub 107: Bending portion 109: Inner needle 111: Inner needle knob 113: Protective pipe 115: Catheter 117: Protective pipe knob 203: Outer needle 215: Catheter 221: Cutting edge of the outer needle 223: Jaw portion of the outer needle

Claims (4)

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;
A lumbar puncture needle, in which 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. a protection pipe knob for holding the protection pipe at a proximal end of the protection pipe;
The lumbar puncture needle according to claim 1 , wherein when the protective pipe is inserted into the outer needle, the protective pipe knob engages with and is fixed to the needle hub, thereby fixing the protective pipe to the outer needle. The lumbar puncture needle according to claim 1 or 2, wherein the outer needle and the inner needle are made of a metal material, and the protective pipe is made of a polymer material or a metal material. The lumbar puncture needle according to any one of claims 1 to 3, in which, after the catheter is placed inside the body, the protective pipe and the outer needle are removed from the body while the protective pipe is still extending beyond the distal end of the outer needle.