JPS6124279Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a needle for cardiopulmonary imaging. Cardiopulmonary imaging needles are commonly used in combination with catheters and are of the double needle type to perform treatment or examination of a patient's heart or lungs. The method of use is to puncture a venous blood vessel with a double needle, then pull out the inner needle of the double needle, and then insert a medical guide wire into the outer needle of the double needle to treat the patient. The guidewire is inserted to the affected part of the lung or the heart while being monitored using X-rays. Next, remove the outer needle from the guide wire, and then insert a flexible synthetic resin catheter with the same diameter as the outer needle's inner diameter and outer diameter, using the guide wire as its axis to reach the affected area. insert. Next, the air present in the catheter is removed, and the drug is injected using a drug injection syringe installed at the tip of the catheter outside the body.
Alternatively, a test device for inspecting the affected area is inserted into the catheter and delivered to the affected area to perform work such as directly measuring heart pressure.
During the above-mentioned work, in order to insert the double needle into the venous blood vessel and perform various tests later, the inner and outer diameters of the conventional catheter are too thin, so a thicker catheter is needed. It is more convenient to perform the test by inserting the tube into the blood vessel. Therefore, in order to insert a thicker catheter into a blood vessel, the blood vessel must be incised and the catheter inserted. However, this incision method is extremely unfavorable in terms of blood vessel function, so in order to insert a thicker catheter without making an incision, the conventional double needle puncture port must be enlarged without making an incision. It is better to insert a catheter. Therefore, we devised a triple needle instead of a double needle to make it easier to insert the thicker catheter by enlarging its puncture opening and making it easier to perform treatments and tests. Next, the present invention will be explained in detail with reference to the drawings of one embodiment.

FIG. 1 is a schematic side cross-sectional view of a conventional double needle. The inner needle 1 is a stainless steel needle tube, and the outer needle 2 is provided coaxially with the inner needle 1. The material of the outer needle 2 is flexible synthetic resin, and the needle tube is provided therein. 1a and 2a are needle bases of needle tubes, respectively. The material of the needle bases 1a, 2a is metal or hard synthetic resin, and the inner cavity of the needle base has a female taper shape 1b, 2b, so that other male taper members (not shown, the same applies hereinafter) can be tightly fitted into them. It is set as. FIG. 2 is a schematic side sectional view showing an example of the use of the double needle of FIG. 1. A double-needle outer needle 2 is punctured into a venous blood vessel 3 and left therein, and a medical guide wire 4 is inserted into the outer needle 2 to reach the patient's heart 5. As described above, the outer needle 2 is removed from the guide wire 4, and then a catheter (not shown) having the same thickness as the outer needle 2 is inserted into the heart 5, using the guide wire 4 as an axis. After inserting
The guide wire is removed and treatment is then performed by injecting drugs or inserting testing instruments. FIG. 3 is a schematic side sectional view of an embodiment of the present invention. The inner needle 6 is a stainless steel injection needle, and the needle base 6a is made of metal or hard synthetic resin. A male tapered part 6a' is provided on the outer periphery of the needle base 6a, and the inner cavity thereof is formed into a female tapered shape 6b, so that it can be tightly fitted into another member having a male taper (not shown, the same applies hereinafter). . The middle needle 7 is a flexible synthetic resin needle tube and has a needle base 7a. A male taper portion 7 is provided on the outer periphery of the needle base 7a.
a', and its inner lumen has a female tapered shape 7b so that it can be closely fitted with another male tapered member or the male tapered portion 6a' of the needle base 6a, and further has a blood backflow prevention valve 7c. It has it built-in. A screw-shaped lure lock portion 7a is provided on the outer peripheral surface of the needle hub 7a so that the needle hub 8a of the needle tube 8 can be locked therein. This is provided with a lure lock 7d so that the needle tube 7 can be temporarily screwed and fixed to prevent the needle tube 7 from being pushed out from the needle tube 8 by the pressure of blood.
The outer needle 8 is a flexible synthetic resin needle tube and has a needle base 8a. The inner lumen of the needle base 8a has a female tapered shape 8b, which allows it to fit tightly with another male tapered member or the male tapered portion 7a' of the needle base 7a, and further incorporates a vascular backflow prevention valve 8c. I have it. By providing the needle tube 8, if necessary, it is possible to insert a catheter with a larger diameter than the outer diameter of the conventional double needle into the venous blood vessel, and in this case, the blood vessel There is no need to make an incision and insert a thick catheter. That is, the triple needle is inserted into the blood vessel to enlarge the puncture opening. Figure 4 is A- in Figure 3.
It is a sectional view of part A. Figure 5 shows needle bases 7a and 8a.
FIG. 2 is a cross-sectional view of the needle tube 6 or 7 which has blood backflow prevention valves 7c and 8c built into the inner lumen of the needle tube 6 or 7. As shown in FIG. 3, the valves 7c and 8c have a desired thickness so as to prevent blood from flowing out from the needle tube 7 or 8 when the needle tube 6 or 7 is not penetrated. It is made of a material that can be closed freely. When it is actually used, it is used in a very similar manner to the conventional method as described above.
As described above, the present invention has the needle base 7a shown in one embodiment,
Blood backflow prevention valves 7c and 8c are provided in the lumen of 8a, and a male tapered portion is provided at each needle base, so that losses such as wasteful blood flow during use are maximized. This can be prevented, and when inserting a catheter that is thicker than before, the puncture port can be enlarged without incising the venous blood vessel, making it possible to insert a thicker catheter, making it extremely safe to use. A lure lock part 7c is attached to the needle base 7a so that the needle can be temporarily fixed so that it does not come off the outer needle 8.
It has features such as providing convenience in use.

[Brief explanation of the drawing]

FIG. 1: A schematic side sectional view of a conventional double needle. FIG. 2: A schematic side sectional view of an example of the use of the double needle in FIG. 1. FIG. 3: A schematic side sectional view of one embodiment of the present invention. FIG. 4: A partial sectional view taken along the line A-A in FIG. 3. FIG. 5...A sectional view of the valves 7c, 8c portions of the needle bases 7a, 8a. 1...Inner needle. 1a... Needle base. 1b...Female taper part. 2...Outer needle. 2a... Needle base. 2b...Female taper part. 3...Patient's venous blood vessels. 4...Medical guide wire. 5...The patient's heart. 6...Inner needle (needle tube). 6a... Needle base. 6a'...Male taper part.
6b... Female taper part. 7... Middle needle (needle tube). 7
a... Needle base. 7a′...Male taper part. 7b...
Female taper part. 7c...Vascular backflow prevention valve. 7d...
...Luarotsk Department. 8...Outer needle (needle tube). 8a...
Needle base. 8b... Female taper part. 8c...Vascular backflow prevention valve.

Claims (1)

[Scope of utility model registration request] The inner cavity of the needle base of the inner needle and the inner cavity of the needle base of the outer needle are provided with valves to prevent backflow of blood, and the tube members of the inner needle and the outer needle are made of flexible synthetic resin needle tubes. The inner needle made of stainless steel is provided in the shape of a shaft, and a luer lock screw part is provided on the outer peripheral surface of the needle base of the middle needle to enable the needle base of the outer needle to be luer-locked, and each needle base has male and female taper parts. A needle for cardiopulmonary imaging, characterized in that it is provided with a triple needle.