JP2001046500A - Medical injection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a syringe needle to be easily stabbed into even an elastic tissue. SOLUTION: This medical injection apparatus 1 includes: an ultrasonic vibrator 22 which generates ultrasonic vibrations; covers 20, 21 for covering the ultrasonic vibrator 22; a probe 4 connected to the ultrasonic vibrator 22 for transmitting the ultrasonic vibrations generated by the ultrasonic vibrator 22; and a needle part 4a provided at the tip of the probe 4 and having a diagonally cut end face. The probe 4 is formed with a through hole 5 opened by the needle part 4a and a base 27 to which a syringe with an injection fluid sealed therein is connected is provided on the cover 21 in such a way as to communicate with the through hole 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical injection device, and more particularly to a medical injection device capable of piercing a living tissue with an injection needle by the action of ultrasonic vibration.

[0002]

2. Description of the Related Art Generally, a bladder tumor is excised transurethrally under endoscopic observation. Such an excision is usually performed in an operation room after lumbar spine anesthesia is performed to reduce pain. However, in recent years, at the time of outpatient consultation, a bladder tumor is also transurethrally removed in an examination room under endoscopic observation. In this case, since the excision procedure is not performed in the operation room, lumbar spine anesthesia is not performed, and pain relief is often achieved by local anesthesia around the bladder tumor.

In general, local anesthesia involves puncturing a bladder wall around a bladder tumor with a needle introduced into the body under endoscopic observation transurethrally, and penetrating tissue surrounding the bladder tumor through the punctured needle. This is done by administering an anesthetic. An injection device used for administration of such an anesthetic is disclosed in, for example, JP-A-10-277149 and JP-A-1
No. 0-85331.

[0004]

However, the bladder wall is
Generally, they are elastic. Therefore, in local anesthesia, even if you try to puncture by pressing the injection needle against the bladder wall,
The urging force causes the bladder wall to expand, and the needle cannot be stabbed into the bladder wall. Thus, the time before the anesthetic is administered is prolonged, during which the patient must endure discomfort and pain. In particular, in an outpatient consultation, it is not possible to consult and treat one patient for a long period of time, so it is desirable to quickly perform local anesthesia.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a medical injection device which can easily puncture an injection needle into a tissue having high elasticity. It is to be.

[0006]

In order to solve the above-mentioned problems, a medical injection device according to the present invention comprises: an ultrasonic vibrator for generating ultrasonic vibration; a cover for covering the ultrasonic vibrator; A probe connected to the ultrasonic transducer and transmitting ultrasonic vibration generated by the ultrasonic transducer; and a needle portion provided at the tip of the probe and having an obliquely cut end surface. A through-hole opening at the portion is formed, and a cap to which a syringe filled with an injection solution is connected is provided in the cover so as to communicate with the through-hole.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. As shown in FIG. 1, a medical injection device 1 according to the present embodiment includes a tubular sheath 3 inserted into a body, and a grasping portion that is connected to a proximal end of the sheath 3 and is grasped by an operator's hand. And an operation unit 2 that forms Sheath 3
Inside, a tubular injection needle probe 4 is inserted and arranged in the longitudinal direction.

The distal end of the injection needle probe 4 protrudes from the distal end of the sheath 3 to form a needle portion 4a whose end surface is obliquely cut. In this case, the end face of the needle portion 4a
It is formed as an inclined surface that forms an acute angle with respect to the axis of the injection needle probe 4. The injection needle probe 4 has a through hole 5 formed therein. The through-hole 5 extends over the entire length of the injection needle probe 4 with the longitudinal center axis of the injection needle probe 4 as its axis. In addition, the injection needle probe 4
Is formed of a material having excellent acoustic characteristics and relatively high flexibility, for example, a titanium-based alloy.

As shown in detail in FIGS. 2 and 3,
The operation unit 2 is formed as a handpiece, and has a cylindrical cover forming a grip. This cover comprises a front case 20 and a rear case 21 which can be separated from each other. Specifically, a female screw part 21A screwed to a male screw part 20A formed at the base end of the front case 20 is formed at the distal end of the rear case 21, and the female screw part 21A is formed into a male screw part. 20A, the rear case 21 becomes the front case 2
When the female screw 21A is detached from the male screw 20A while being integrally attached to the rear case 21, the rear case 21 is separated from the front case 20 as shown in FIG.

The rear case 21 contains an ultrasonic transducer 22 therein. The ultrasonic transducer 22 includes a plurality of piezoelectric elements 24.
have. Each piezoelectric element 24 is provided so as to be sandwiched between the electrode plates 37. Electric wires 26 for supplying current are soldered to each electrode plate 37. Each electric wire 26 is electrically connected via a cord 6 to a generator 7 (see FIG. 1) for supplying electric power necessary for generating ultrasonic vibration. Therefore, when a current flows from the generator 7 between the electrode plates 37 via the electric wires 26, the piezoelectric element 24 expands and contracts, and an ultrasonic vibration is generated.

As shown in FIG. 1, a foot switch 8 for operating the oscillation / stop of the ultrasonic vibration is connected to the generator 7. Further, as shown in FIGS. 1 and 2, the cord 6 is connected and fixed to the rear case 21 via a buckling member 29.

The ultrasonic oscillator 22 includes an ultrasonic oscillator 22
A horn 23 is connected to amplify the ultrasonic vibration generated in the above and expand the amplitude. At the tip of horn 23,
A female screw 32 to which the injection needle probe 4 is attached is formed. A male screw 31 formed at the proximal end of the injection needle probe 4 is screwed into the female screw 32. That is, the injection needle probe 4 is detachable from the horn 23 and can be separated from the horn 23 via the screws 31 and 32 as shown in FIG.

On the outer peripheral surface of the proximal end portion of the injection needle probe 4, a concave wrench hooking portion 30 to which a wrench (not shown) is hooked is formed. When a wrench is hung on the wrench holder 30 and the injection needle probe 4 is rotated with respect to the horn 23, the injection needle probe 4 can be attached to and detached from the horn 23.

The horn 23 is supported in the rear case 21 by a fastening nut 38 screwed to the inner surface of the front end of the rear case 21 together with the ultrasonic transducer 22 connected thereto. Specifically, a flange portion 23A is projected from the base of the horn 23, and the flange portion 23A of the horn 23 is sandwiched between the support portion 21B projected from the inner surface of the rear case 21 and the tightening nut 38. Thereby, the ultrasonic transducer 22 and the horn 23 are supported with respect to the rear case 21. In this case, the first support rubber 2 that absorbs vibration is provided between the support portion 21B and the flange portion 23A.
5A is interposed. A second support rubber 25B that absorbs vibration and ensures watertightness and airtightness is interposed between the flange portion 23A and the tightening nut 38.

Each of the ultrasonic vibrator 22 and the horn 23 is formed with a through-hole 39 penetrating the axis thereof. The through-hole 39 communicates with the through-hole 5 of the injection needle probe 4 when the injection needle probe 4 is attached to the horn 23.

The rear case 21 has a tubular syringe base 27.
Is attached and fixed. The base end side of the syringe base 27 protrudes from the base end surface (rear surface) of the rear case 21 and forms a base to which the syringe 9 shown in FIG. 1 is connected. The distal end of the syringe cap 27 is connected and fixed to the ultrasonic vibrator 22 and communicates with the through hole 39 of the ultrasonic vibrator 22. An O-ring 28 is press-fitted between the end face of the syringe base 27 and the ultrasonic transducer 22 to ensure watertightness.

Next, the operation of the medical injection device 1 having the above configuration will be described.

In the case of local anesthesia around the bladder tumor, the sheath 3 of the medical injection device 1 is inserted into the channel 14 of the insertion portion 13 of the endoscope 10, as shown in FIGS. In addition, the sheath 3 is used by projecting the distal end side from the distal end of the insertion portion 13. In this case, a light source device 12 is connected to a light guide cable 11 extending from an operation unit of the endoscope 10. Illumination light from the light source device 12 is transmitted to the distal end side of the insertion portion 13 via the light guide cable 11 and the light guide fiber disposed in the insertion portion 13, and is disposed on the distal end surface of the insertion portion 13. The object to be observed is irradiated through the illumination lens 16 thus set. Further, the reflected light (object light) from the observation object is taken into the endoscope 10 through the objective lens 15 similarly arranged on the distal end surface of the insertion section 13 and is connected to the endoscope 10 via an observation optical system (not shown). It is observed as an endoscope image by the eye part 50.

Hereinafter, the case of local anesthesia around the bladder tumor will be specifically described.

First, as shown in FIG.
Medical injection device 1 while inserting the insertion portion 13 into the bladder.
Is carefully inserted into the channel 14 of the endoscope insertion section 13. Then, with the distal end of the insertion section 13 facing the bladder wall 18 located near the bladder tumor 17, the distal end of the sheath 3 is projected from the distal end of the insertion section 13.

Subsequently, before piercing the needle portion 4a at the tip of the injection needle probe 4 into the bladder wall 18, the switch of the foot switch 8 is pressed, and the ultrasonic vibrator is transmitted from the generator 7 via the cord 6 and the electric wire 26. A current is supplied to the 22 electrode plates 37. As a result, ultrasonic vibration is generated by the electrostrictive action of the piezoelectric element 24, and the ultrasonic vibration is expanded to a desired amplitude by the horn 23 while the tip needle portion 4 of the injection needle probe 4.
a. At this time, carelessly touching the injection needle probe 4 may damage the inner surface of the channel 14 or cause unnecessary damage to the living tissue, but the sheath 3 covers the outside of the injection needle probe 4. Therefore, such a situation can be prevented.

Next, the needle portion 4 to which the ultrasonic vibration is transmitted
a is punctured into the bladder wall 18 near the bladder tumor 17. At this time, the needle portion 4a is smoothly inserted into the resilient bladder wall 18 without escape by the action of the ultrasonic vibration.

When the needle portion 4a is inserted into the bladder wall 18 to a predetermined depth, the syringe 9 containing an anesthetic is connected to the syringe base 27, and the piston 9A of the syringe 9 is pushed in the direction of arrow A. Thereby, the anesthetic 19 is injected into the bladder wall 18 via the syringe base 27, the ultrasonic transducer 2 and the through holes 39 and 5 of the injection needle probe 4.

In the medical injection device 1 of the present embodiment,
Since the injection needle probe 4 can puncture the tissue by the action of the ultrasonic vibration, the puncturing performance does not extremely decrease. However, if it is repeatedly used, the puncturing performance may gradually decrease. In this case, the injection needle probe 4
Must be removed from the horn 23 and replaced. That is, first, the screw portions 20A and 21A are loosened and the front case 2
0 and the rear case 21 are released, and the rear case 21 is released.
Is removed from the front case 20. Then, a wrench (not shown) is engaged with the wrench holder 30 of the injection needle probe 4, and
The injection needle probe 4 is rotated with respect to the horn 23. Thereby, the injection needle probe 4 comes off from the horn 23,
The needle probe 4 can be replaced.

As described above, the medical injection device 1 of this embodiment has the ultrasonic vibrator 22, and the ultrasonic vibration generated from the ultrasonic vibrator 22 applies the ultrasonic vibration to the injection needle probe 4 and the tip of the injection needle probe 4. The structure is transmitted to the needle part 4a.
Therefore, the needle portion 4a is smoothly punctured by the action of the ultrasonic vibration without requiring a strong force, even in a tissue having high elasticity. Moreover, since the end surface of the needle part 4a is cut obliquely, the penetration property into the tissue is further improved. Further, since the syringe base 27 is provided on the hand side of the cover of the operation unit 2, the anesthetic can be immediately administered after the needle 4a is inserted into the tissue. As described above, when the local anesthesia can be quickly performed, the discomfort and pain of the patient can be minimized, and the procedure from the anesthetic injection to the tumor removal procedure can be promptly performed. Therefore, the treatment time in the outpatient consultation can be shortened.

Note that the medical injection device 1 of the present embodiment is
The tissue to be treated is not limited to the bladder wall 18. For example, the present invention is applicable to other living tissues and mucous membranes. In the present embodiment, the needle portion 4a may be configured to be detachable from the main body of the probe 4. In this case, the needle portion 4a can be disposable and used.

FIG. 6 shows a second embodiment of the present invention. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the medical injection device 1A according to the present embodiment, a base 33 to which a syringe 35 can be connected is provided on a side surface of the front case 20. The inner hole of the base 33 communicates with the inside of the front case 20 and the gap between the sheath 3 and the injection needle probe 4. The other configuration is the same as that of the first embodiment.

In such a configuration, the syringe 35 is connected to the base 33 so that the cooling liquid 3 filled in the syringe 35 can be used.
When the cooling liquid is supplied from the base 33, the cooling liquid is supplied to the sheath 3.
It is discharged from the distal end of the sheath 3 through a gap between the sheath 3 and the needle probe 4, and is collected by a collecting unit (not shown) through a gap between the channel 14 of the endoscope 10 and the sheath 3.

The reflux of the cooling liquid 34 suppresses the heat generated when the injection needle probe 4 that vibrates ultrasonically comes into partial contact with the sheath 3, thereby enabling a safe injection treatment. This makes it possible to perform the injection procedure a plurality of times in succession.

According to the technical contents described above, the following various configurations can be obtained.

1. A vibrator that generates ultrasonic vibration, a cover that covers the vibrator, a probe that transmits ultrasonic vibration that can be elastically deformed relatively flexibly, and a through hole that penetrates coaxially around the vibrator and the center axis of the probe In the ultrasonic unit, the distal end surface of the probe is formed into an acute slope, and a syringe mounting base for injecting an anesthetic solution is provided at the end of the through hole on the hand side of the cover. needle.

2. 2. The ultrasonic injection needle according to claim 1, wherein a sheath covering a part of the probe is provided.

3. 3. The ultrasonic injection needle according to claim 2, wherein the sheath is detachably assembled.

4. 2. The ultrasonic injection needle according to claim 1, wherein a screw fastening portion is provided at a connecting portion between the transducer and the probe, and the probe is made detachable by loosening the screw fastening.

5. 2. The ultrasonic injection needle according to claim 1, further comprising a base for feeding a liquid flowing back through a gap between the sheath and the probe.

[0038]

As described above, according to the medical injection device of the present invention, it is possible to easily puncture the injection needle even into a tissue having high elasticity.

[Brief description of the drawings]

FIG. 1 is a perspective view of a medical injection device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the medical injection device of FIG.

FIG. 3 is a sectional view showing a state in which the medical injection device of FIG. 1 is disassembled.

FIG. 4 is a perspective view showing a state in which the medical injection device of FIG. 1 is inserted into an endoscope.

5 is a perspective view showing a state in which the needle portion of the medical injection device of FIG. 1 has been inserted into the bladder wall endoscopically.

FIG. 6 is a cross-sectional view of a medical injection device according to a second embodiment of the present invention.

[Explanation of symbols]

 1, 1A: Medical injection device 4: Injection needle probe 5, 39: Through hole 20, 21: Cover 22: Ultrasonic transducer 27: Syringe base

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsumasa Okada 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Kenichi Kimura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Takahiro Ogasaka 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industries Co., Ltd. (72) Inventor Hiroshi Okabe 2-43-2, Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Masaaki Ueda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Akira Shiga 2-43-2, Hatagaya, Shibuya-ku, Tokyo (72) Inventor Takeaki Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. in the F-term (reference) 4C066 AA10 BB01 CC01 DD08 FF10 KK01

Claims (1)

[Claims] 1. An ultrasonic vibrator for generating ultrasonic vibration, a cover for covering the ultrasonic vibrator, and a probe connected to the ultrasonic vibrator and transmitting ultrasonic vibration generated by the ultrasonic vibrator. And a needle portion provided at the tip of the probe and having an obliquely cut end surface. The probe has a through-hole opened at the needle portion, and the cover is filled with an injection solution. A base to which the connected syringe is connected so as to communicate with the through-hole.