JP3744985B2 - Puncture needle for catheter introduction - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a puncture needle used when a catheter is introduced into a blood vessel for diagnosis or treatment of blood vessels or organs.
[0002]
[Prior art]
For example, as described in Japanese Patent Publication No. 2-949, the operation of introducing the catheter into the blood vessel first percutaneously punctures the blood vessel with a puncture needle formed by inserting the inner needle into the casser. Secondly, leave the caseter and remove the inner needle, Third, insert the guide wire into the casator, Fourth, leave the guide wire and remove the casator, Fifth, the expansion tube is inserted Introducing the introducer (catheter introducer) into the guide wire and introducing the sheath of the introducer into the blood vessel, sixth, leaving the sheath and removing the guide wire and the expansion tube, seventh In many cases, the catheter is inserted into the sheath to reach a target site in the blood vessel.
[0003]
[Problems to be solved by the invention]
In the catheter introduction operation described above, it is essential that the puncture needle is securely punctured into the blood vessel in the first and second procedures, and the tip of the casserter is located in the blood vessel. For this reason, the syringe of the syringe is used as the inner needle. It is confirmed that the blood has entered the blood vessel when the blood flows into the syringe.
[0004]
Therefore, during the second procedure and the third procedure, that is, from when the inner needle is removed until the guide wire is inserted, it is inevitable that blood that has passed through the casser will flow out. Therefore, even if the operator considers that the guide wire is quickly inserted when the inner needle is removed to minimize the outflow of blood, a considerable amount of blood will flow out when the artery is punctured.
[0005]
The blood that has flowed out through the casserter is extremely dangerous because some patients contain infectious bacteria and viruses, so the next operation must be carried out with great care to avoid contact. There is a worry of making mistakes. Also, wiping out the spilled blood is extremely dangerous because there are many opportunities for contact. Furthermore, since blood also adheres to the inner needle removed from the catalyzer, sufficient care must be taken in its handling.
[0006]
Despite paying sufficient attention to blood leaked from these cassetters and blood adhering to the inner needle, the technician and the people around him may be slightly inadvertent or out of order. There have been many accidents in which a needle has been stabbed into a finger and infected.
[0007]
In the present invention, blood flows out through the cannula between the time when the puncture needle is punctured into the blood vessel and the inner needle is removed until the guide wire is inserted, and the blood is attached to the removed inner needle. Solves the above-mentioned problem that these bloods are extremely dangerous when they contain infectious bacteria and viruses, and blood does not flow out to the outside after the inner needle is removed and the guide wire is inserted. In addition, an object of the present invention is to provide a puncture needle that does not expose the inner needle and can be operated safely without worrying about infection caused by the inner needle being stuck.
[0008]
[Means for Solving the Problems]
The present invention has been made in view of the above-described problems, and includes a casser and a straight pipe extending rearward from the base end thereof and arranged in a straight line with each other, and a side branched from the distal end portion of the straight pipe and extended rearward. A tube;
A packing and hemostasis valve made of an elastic material embedded in each of the straight pipe and the side pipe;
An inner needle that is inserted through the casserter and a straight pipe and the packing is pressed against;
A telescopic tube housed in the straight tube, with both ends fixed to the inside of the straight tube and an inner needle hub, surrounding the proximal end portion of the inner needle;
When the inner needle is removed from the casser, the distal end portion is wrapped in the straight tube and the proximal end portion is wrapped in the telescopic tube and protrudes rearward of the straight tube, and then the side tube Is configured to allow the guide wire to be inserted in communication with the casser, and the side tube is configured so that the guide wire inserter fitting portion and the guide wire are linearly formed in order from the proximal end to the distal end. And a guide part that guides the guide wire toward the catalyzer, and the hemostasis valve is disposed at a tip part of the molding part. It is what .
[0009]
In addition, the catheter introduction puncture needle is characterized in that it has a vent hole with a filter that does not allow blood to pass but allows air to pass through a side surface closer to the distal end than the packing of the straight tube.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, an embodiment of the present invention will be described. A straight tube 4 made of a hard synthetic resin is connected to a connecting portion 2 of a casserta 1 composed of a flexible thin tube 3 having an enlarged diameter connecting portion 2 as a base. A distal end portion of the straight pipe 4 that is arranged in the same straight line as the casser 1 and extends rearward is integrally formed with a side tube 5 made of a hard synthetic resin that extends obliquely rearward. It is branched by.
[0013]
The straight pipe 4 has a vent hole 6 on the side surface of the side pipe 5 opposite to the side pipe 5 at the distal end portion of the branch pipe 5, and a filter 7 that does not allow blood to pass but allows air to pass therethrough is attached. ing. In addition, a short cylindrical packing 8 made of an elastic material is positioned and fixed to the base end side of the branch portion of the side pipe 5.
[0014]
On the other hand, the side tube 5 has an enlarged fitting portion 10 adapted to the inserter of the guide wire 20 opened at the base end, and a guide for forming the guide wire 20 linearly on the distal end side thereof. In order to smoothly insert the molding portion 11 and the guide wire 20 that are reduced in diameter to approximately the same diameter as the wire 20 and extend straight through the straight tube 4 into the casser 1, in a direction substantially parallel to the central axis of the casser 1. It has the guidance part 12 to guide in order. In addition, a disc-shaped hemostatic valve 13 that is inserted through the guide wire 20 but is normally closed by its own elastic force is provided at the proximal end of the molded portion 11. As the hemostasis valve 13, for example, the one shown in Japanese Utility Model Laid-Open No. 1-87746 is used.
[0015]
The inner needle 15 is inserted through the entire length of the casser 1 and the straight pipe 4, the packing 8 is pressed against the outer peripheral surface, and the inner needle hub 17 is fitted to the proximal end of the straight pipe 4 with the distal end portion fitted. The puncture blade 16 at the end protrudes from the tip of the catalyzer 1.
[0016]
Further, a bellows-like expansion / contraction tube 18 made of a flexible material such as a thin-walled synthetic resin is attached to the packing 8 and the inner needle hub 17 at both ends to wrap the proximal end portion of the inner needle 15. The pipe 18 is housed in the straight pipe 4 in a contracted state.
[0017]
The puncture needle having such a configuration is used to puncture a blood vessel percutaneously with the same procedure as a conventional puncture needle. When the tip of the casserter 1 penetrates across the blood vessel, the inner needle 15 is removed, and the next It is also the same as in the prior art that the casserter 1 is pulled back slightly, and it is confirmed that the tip is located in the blood vessel by the blood flowing into the casserter 1.
[0018]
According to the illustrated form, when the inner needle 15 is pulled while holding the inner needle hub 17, the telescopic tube 18 extends to wrap around the proximal end portion of the inner needle 15 drawn from the proximal end of the straight tube 4. The telescopic tube 18 is formed so that the distal end of the inner needle 15 is located on the proximal end side of the joining portion of the guide portion 12 of the side tube 5 and on the distal end side of the packing 8 when the telescopic tube 18 is expanded and contracted to the maximum. The inner needle 15 is removed from the casser 1 and is left without being exposed in a state of being wrapped by the straight pipe 4 and the expansion pipe 18 at the position shown in FIG.
[0019]
As a result, operations such as insertion of a guide wire 20 described later and removal of the casator 1, the straight tube 4 and the side tube 5 can be performed without worrying about touching the inner needle 15, and the inner needle 15 can be expanded and contracted. Disposal in the state of being wrapped in the tube 18 prevents the infection of the processor due to the inner needle 15 being stuck.
[0020]
Next, when the whole is pulled back slightly from the puncture position, the tip of the casserter 1 comes to be located in the blood vessel, and blood enters the tip of the straight tube 4 through the casserter 1. The blood enters the position where the pressure of the air enclosed by the packing 8 and the hemostasis valve 13 and the blood pressure are balanced, but in the illustrated embodiment having the vent 6, the air is discharged through the filter 7 and the vertical puncture is performed. Enter the portion indicated by L slightly above the filter 7 in the posture. Even if the puncture posture further enters the proximal end, it is blocked by the packing 8 or the hemostasis valve 13, and in any case, blood does not flow out.
[0021]
In the illustrated form, the straight tube 4 and the side tube 5 are made of a transparent material, and the tip of the casser 1 is vascularized by visually observing that the blood contained therein beats in response to the heartbeat. It is confirmed that it is correctly positioned inside.
[0022]
The vent hole 6 can be provided at an arbitrary portion of the portion extending from the connecting portion 2 of the catalyzer 1 to the distal end side of the packing 8 of the straight tube 4 or the distal end side of the hemostasis valve 13 of the side tube 5. In order to insert the guide wire into the side tube 5 while confirming the pulsation, the guide wire is preferably provided at the position shown in the figure.
[0023]
Referring to FIG. 2B, the guide wire 20 is provided with an inserter 21 at the tip in advance for mounting and guiding the guide wire 20 to the connecting portion 2 of the casserter 1 or the like. When this inserter 21 is fitted into the fitting portion 10 of the side tube 5 and the guide wire 20 is pushed in, even if the tip is curved like a bowl, it is linearly formed by the molding portion 11 and is hemostatic. It passes through the valve 13 while going straight, and then advances in a direction parallel to the guide axis 12 while approaching the central axis of the casser 1, and is inserted into the casser 1 from the tip of the straight pipe 4, and further its tip. To be introduced into blood vessels.
[0024]
When the guide wire 20 reaches a predetermined site, the straight tube 4 and the inner needle 15 are also separated from the guide wire 20 together with these when the casser 1 and the side tube 5 are removed along the guide wire 20. Is discarded as it is. Since the inner needle 15 does not protrude from the tip of the casserter 1 unless it moves forward until the inner needle hub 17 is fitted into the proximal end of the straight pipe 4, it is safe even if it is pushed in a little during the disposal process.
[0025]
It should be noted that the casing 8 and the packing 8 of the straight pipe 4 and the side pipe 5 and the hemostatic valve 13 and the distal end side portion thereof can be integrally formed, and the packing 8 can be the same as the hemostatic valve 13.
[0026]
【The invention's effect】
As described above, a straight tube that retracts the inner needle, a telescopic tube, and a side tube that guides the guide wire are arranged behind the basal end of the casser, and each has a packing and a hemostasis valve as blood sealing means. According to the present invention, the blood passing through the casser does not flow to the outside between the removal of the inner needle and the insertion of the guide wire, and the sharp tip of the removed inner needle is not exposed. It can be safely operated without worrying that the related persons around it and blood will be infected, and it can be disposed of without exposing the inner needle as it is.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
2A and 2B are partial longitudinal sectional views showing a use state of the embodiment of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cassator, 4 Straight pipe, 5 Side pipe, 6 Vent, 7 Filter, 8 Packing, 10 Fitting part, 11 Molding part, 12 Guide part, 13 Hemostatic valve, 15 Inner needle, 18 Telescopic pipe, 20 Guide wire

Claims (2)

A casator (1) and a straight pipe (4) extending rearward from the base end thereof and arranged in a straight line with each other, and a side pipe (5) branching from the distal end of the straight pipe (4) and extending rearward;
A packing (8) and a hemostasis valve (13) made of an elastic material embedded in each of the straight pipe (4) and the side pipe (5) ;
An inner needle (15) inserted through the casserter (1) and the straight pipe (4 ) and pressed against the packing (8) ;
An extensible tube (18) having both ends fixed to the inside of the straight tube (4) and the inner needle hub (17) , enclosing the proximal end portion of the inner needle (15 ) and housed in the straight tube (4 ) ; ;
When the inner needle (15) is removed from the casser (1), the distal end is wrapped in the straight tube (4) and the proximal end is wrapped in the telescopic tube (18). The tube (4) protrudes rearward, and at that time, the side tube (5) communicates with the catalyzer (1) so that a guide wire (20) can be inserted. The side tube (5) In order from the end to the end, the fitting portion (10) of the guide wire / inserter and the guide wire (20) are formed in a straight line, and the diameter is reduced to substantially the same diameter as that of the guide wire (20). A guide part (12) for guiding the part (11) and the guide wire (20) toward the catalyzer (1), and the hemostasis valve (13) is disposed at the tip of the molding part (11) It is characterized by being .   2. The catheter introduction puncture needle according to claim 1, further comprising: a vent hole with a filter that does not allow blood to pass but allows air to pass through a side surface of the straight tube that is more distal than the packing. Puncture needle.

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