JPH0644549U - Compound needle for anesthesia - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the probability that the inner needle of the compound needle for anesthesia protrudes from the through hole, and to improve the certainty and safety of compound anesthesia. [Structure] An outer needle having a tip bent portion whose tip is bent in a dogleg shape and having a through hole in the tip bent portion, and an inner needle fitted and inserted into the outer needle are provided. In a compound needle for anesthesia that allows both spinal anesthesia and epidural anesthesia by allowing the tip of the needle to protrude, the through hole is circular when viewed from the tip side, and its center is from the outer needle axis or the axis. A compound needle for anesthesia characterized by being provided slightly above. Further, if a spacer tube is provided on the outer periphery slightly closer to the root from the tip of the inner needle, the reliability can be further enhanced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compound needle for anesthesia that can be used for both epidural and spinal anesthesia.

[0002]

[Prior art]

 A compound needle for anesthesia was published in, for example, Japanese Utility Model Publication No. 63-41007, and was put to practical use and sold as shown in FIGS.

FIG. 6 is a partial sectional view of the tip of an outer needle 20 of a conventional anesthesia compound needle, and FIG. 7 is a front view of the needle. A through hole 22 is formed in the tip bent portion 21 that is bent in a V shape at the tip, but the position is at the bottom of the outer needle, and the shape is also an irregular shape close to a semicircle as shown in FIG. .

[0004]

[Problems to be solved by the device]

 In the above conventional compound needle for anesthesia, the position of the through hole 22 is set to the lowermost part of the outer needle 20. The inner needle is probably the bottom of the inner surface of the outer needle due to gravity when the inner needle is inserted into the outer needle. This is probably because it is considered that it is most convenient for the tip of the inner needle to protrude from the through hole. However, in reality, in this conventional compound needle for anesthesia, the probability that the tip of the inner needle projects from the through hole is extremely low, and is only a few percent. That is, in most cases, it projects into the blade tip hole 23 at the tip instead of the through hole. Therefore, the doctor must do the spinal anesthesia with extreme caution or stop the operation with the inner needle protruding from the cutting edge hole 23. As described above, the conventional compound needle for anesthesia has a problem in reliability and there is a great risk of inducing anesthesia accident, so that it is not used at present.

[0005]

[Means for Solving the Problems]

 The present invention has been made to increase the probability that the inner needle protrudes from the through hole to improve the certainty and safety of the compound needle for anesthesia. That is, the present invention has an outer needle having a tip bent portion whose tip is bent in a V shape and having a through hole in the tip bent portion, and an inner needle inserted into the outer needle. In a compound needle for anesthesia that allows both spinal anesthesia and epidural anesthesia by allowing the tip of the inner needle to protrude, the through hole is circular when viewed from the tip side, and its center is the outer needle axis or axis. This is a compound needle for anesthesia, which is characterized by being installed slightly above the heart. If a spacer tube is provided on the outer periphery, which is slightly closer to the root from the tip of the inner needle, the reliability is further enhanced.

[0006]

[Action]

 The applicant made various prototypes and conducted experiments to solve the above problems. As a result, the shape of the through hole was circular when viewed from the tip side, and the center position was the axis of the outer needle or the axis. We have found that it is better to place it slightly above the center, most preferably about 0.1 mm above the axis. The exact reason for this is unknown, but it is thought to be as follows. That is, when the inner needle is inserted into the outer needle, the inner needle does not move straight along the bottom of the inner surface of the outer needle due to gravity, but irregularly while contacting various parts on the upper, lower, left, right, and inner wall of the outer needle. It follows that it is most likely to exist near the axis of the outer needle, more precisely, slightly above the axis. If the center position of the through hole is set 0.1 mm above the axis of the outer needle, the probability that the tip of the inner needle will protrude from the through hole will be 90% or more, and the reliability will be improved more than 10 times that of the conventional one. .

If a spacer tube is provided on the outer periphery slightly closer to the root from the tip of the inner needle, the tip of the inner needle is forcibly maintained at the axial center of the outer needle, so that it is more likely that the tip of the inner needle will protrude from the through hole. Is improved to almost 100%.

[0008]

【Example】

 1 to 5 relate to a compound needle for anesthesia, which is one embodiment of the present invention, FIG. 1 is an exploded view, FIG. 2 is a partial sectional view of a tip of an outer needle, FIG. 3 is a front view of the outer needle, and FIG. And FIG. 5 are also explanatory views of the usage state.

As shown in FIG. 1, the anesthesia compound needle of the embodiment comprises an outer needle 1, an outer needle stylet 2, an inner needle 3 and an inner needle stylet 4. The tip portion of the outer needle 1 is formed with a tip bending portion 5 that is bent upward in a V shape. A through hole 6 is provided in the tip bending portion. As shown in FIG. 3, the through hole 6 has a perfect circular shape when viewed from the tip side, its center is located 0.1 mm above the outer needle shaft center c, and its size is slightly larger than the outer diameter of the inner needle 3. It is getting bigger. As shown in FIG. 2, the tip of the outer needle 1 has a cutting edge hole 7 that opens upward.

The outer needle stylet 2 is fitted and inserted into the outer needle 1, and its tip portion 2 a has substantially the same shape as the tip bent portion 5 of the outer needle 1, and the outer needle 1 in the fitted state. The through hole 6 and the cutting edge hole 7 are substantially closed. This is to prevent the through hole 6 and the blade tip hole 7 from damaging the skin tissue of the patient by inserting the outer needle 1 into the outer needle when the patient is punctured. After puncturing the outer needle, it is pulled out from the outer needle.

As shown in FIG. 4, the inner needle 3 is fitted into the outer needle 1, and its tip projects from the through hole 6 of the outer needle 1. A spacer tube 8 made of stainless steel is attached to the outer periphery at a position of about 15 mm from the tip to the base. The outer diameter of the spacer tube 8 is larger than the outer diameter of the inner needle 2 and slightly smaller than the inner diameter of the outer needle 1. As a result, the vicinity of the tip of the inner needle 3 can always be made to coincide with the axis of the outer needle 1, and can be reliably projected from the through hole 6.

The inner needle stylet 4 is inserted into the inner needle when the inner needle 3 is inserted into the outer needle 1, and the tip thereof coincides with the tip of the inner needle in the fitted state, The blade hole of is almost closed. This is to prevent the tissue such as the dura 11 from being damaged when the inner needle is projected from the through hole 6.

The compound needle for anesthesia of this example is used as follows. The patient is punctured with the outer needle stylet 2 fitted in the outer needle 1, and the tip thereof is brought to the epidural space 12. With the outer needle 1 left indwelling, pull out the outer needle stylet 2. Insert the inner needle stylet 4 into the inner needle 3 and insert it into the outer needle to project the tip of the inner needle from the through hole 6 to pierce the dura 11 into the subarachnoid space 10 as shown in FIG. Deliver. Thereafter, the inner needle stylet 4 is removed while the outer needle 1 and the inner needle 3 are left indwelling, and an anesthetic solution is injected into the subarachnoid space 10 from the inner needle 3 to perform spinal anesthesia. Then, the inner needle 3 is removed, the catheter 9 is inserted into the outer needle 1, the tip is projected from the blade tip hole 7, only the outer needle is removed, and the epidural space 12 is anesthetized with the catheter 9 left indwelling. Epidural anesthesia is performed by continuous infusion of fluid.

Spinal anesthesia is powerful and fast acting, but has a short duration. Epidural anesthesia is weaker but more durable than spinal anesthesia. By using spinal anesthesia and epidural anesthesia together, it becomes possible to perform more ideal anesthesia.

[0015]

[Effect of device]

 Since the compound needle for anesthesia of the present invention has a high probability that the inner needle passes through the through hole of the outer needle when the inner needle is inserted into the outer needle, the doctor can use it without any worries. Anesthesia accident can be prevented.

[Brief description of drawings]

FIG. 1 is an exploded view of a compound needle for anesthesia according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the tip of the outer needle of the same embodiment.

FIG. 3 is a front view of the outer needle of the same embodiment.

FIG. 4 is an explanatory diagram showing a usage state of the embodiment.

FIG. 5 is an explanatory diagram showing a usage state of the embodiment.

FIG. 6 is a partial cross-sectional view of a tip of an outer needle of a conventional compound needle for anesthesia.

FIG. 7 is a front view of the outer needle of FIG.

[Explanation of symbols]

 1 Outer needle 2 Outer needle stylet 3 Inner needle 4 Inner needle stylet 5 Tip bending part 6 Through hole 7 Blade tip hole 8 Spacer tube 9 Catheter 10 Subarachnoid space 11 Dura 12 Epidural space 13 Yellow tract 20 Outer needle 21 Tip Bending Part 22 Through Hole 23 Blade Edge Hole

Claims (3)

[Scope of utility model registration request] 1. An outer needle having a tip bent portion whose tip is bent in a V shape and having a through hole in the tip bent portion, and an inner needle fitted and inserted into the outer needle. In a compound needle for anesthesia that allows both spinal anesthesia and epidural anesthesia by allowing the tip of the inner needle to project from the needle, the through hole is circular when viewed from the tip side, and its center is the outer needle axis or axis. Compound needle for anesthesia characterized by being provided slightly above the heart 2. The compound needle for anesthesia according to claim 1, wherein the center of the through hole is provided 0.1 mm above the axis of the outer needle. 3. The anesthesia compound needle according to claim 1 or 2, wherein a spacer tube is provided on the outer periphery slightly closer to the root from the tip of the inner needle.