JP2007275304A - Catheter introducing implement and medicine liquid injection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a catheter introducing implement which is easily punctured and hardly fall during use. <P>SOLUTION: The catheter introducing implement has a catheter 310 to be dwelled inside a blood vessel, a catheter hub 330 to which the catheter is fixed and an inner needle 310 capable of being inserted into the catheter and the catheter hub and removed, and is provided with a needle guide 380 capable of changing from the first state of covering the root part of the catheter and the second state of exposing the covered part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drug solution injection tool for injecting a drug solution into a blood vessel, and more particularly to a drug solution injection tool in which a catheter is placed in a blood vessel.

  When the injection time of the drug solution to the patient is short, it is often performed by puncturing the blood vessel with a hollow sharp metal needle, but when the injection time is long, in order to prevent damaging the blood vessel, Often, an indwelling needle such as a soft catheter is placed in a blood vessel, and a drug solution is administered through the indwelling needle.

  In addition, CT (Computed Tomography) apparatus, MRI (Magnetic Resonance Imaging) apparatus, PET (Positron Emission Tomography) apparatus, SPECT (Single Photo AMR apparatus, Ultrasonic apparatus, etc.) When a medical image is obtained by this, a contrast agent is injected into the blood vessel for the purpose of improving diagnostic accuracy. Even in such a case, an indwelling needle is used.

  As shown in FIG. 15, the indwelling needle 10 has a double needle consisting of an outer needle and an inner needle at the tip, and is inserted into the hollow and flexible catheter 11 (outer needle; also referred to as a cannula) and this catheter. The inner needle 12 is made of metal and is connected to the tab 14 by a wire (not shown). The catheter 11 is fixed to the catheter hub 16 and connected to the connection port base 18 by the tube 13. The tube 13 is also made of a soft plastic material. When the indwelling needle is used, the subject is punctured with the inner needle 12 inserted into the catheter 11 and then the tab 14 is pulled. Then, the inner needle 12 is pulled out and the soft catheter 11 is placed in the blood vessel. . An extension tube (not shown) is connected to the extension tube connection port 15, and a liquid medicine such as a contrast medium is injected from an injection device connected to the opposite end.

  FIG. 16 shows a state in which the catheter 11 is placed in the blood vessel. FIG. 15 shows an example in which the wing 17 is attached to the catheter hub portion for fixation to the subject. For example, Japanese Patent Application Laid-Open No. 10-15074 (Patent Document 1) and Japanese Patent Application Laid-Open No. 10-028739 (Patent Document). As in 2), an indwelling needle structure in which the base portion of the catheter is cylindrical is also known.

By the way, as for the length of the catheter 11 used for chemical | medical solution injection | pouring, 19 mm, 25 mm, 32 mm, etc. are common. When puncturing the indwelling needle, the catheter hub is grasped with the fingertip. Accordingly, the shorter the distance from the catheter hub to the needle tip, the more stable the needle tip, so the shorter catheter is easier to puncture. However, when the catheter is short, there is a problem that it is easily dropped from the blood vessel as compared with a long catheter.
JP-A-10-15074 Japanese Patent Laid-Open No. 10-028739

  The present invention has been made in view of such problems, and an object of the present invention is to provide a catheter introduction tool that is easy to puncture and that does not easily fall off while the catheter is placed in a blood vessel.

  The present invention relates to the following matters.

1. In a catheter introduction device having a catheter placed in a blood vessel, a catheter hub to which the catheter is fixed, and an inner needle that can be inserted into and removed from the catheter and the catheter hub,
It is possible to change from the first state covering the root portion of the catheter to the second state where the portion covered in the first state is exposed, and is made of a material harder than the catheter. A catheter introduction tool having a formed needle guide.

  2. The needle guide is removable and has a body having a cavity that covers at least a root portion of the catheter, the first state is a state in which the needle guide is fitted, and the second state is 2. The catheter introduction tool according to 1 above, wherein the needle guide is removed.

  3. The needle guide has at least a base portion of the catheter that covers at least the root portion of the catheter and has a cavity having a cut below, and two knobs provided above the outer surface of the barrel portion. 3. The catheter introduction tool according to 2 above, wherein the cut becomes larger and the needle guide can be removed from the catheter by gripping the needle guide.

  4). The needle guide has a body having a cavity that covers at least a root portion of the catheter, can be slid along the catheter and can be accommodated in the catheter hub, and the first state includes the needle guide. 2. The catheter introduction tool according to claim 1, wherein the catheter guide is pulled out from the catheter hub, and the second state is a state in which the needle guide is housed in the catheter hub.

  5. The needle guide has a body portion having a cavity covering at least a root portion of the catheter, and can slide along the catheter to cap the distal end of the catheter hub. 2. The catheter introduction device according to claim 1, wherein the needle guide is pulled out from the catheter hub, and the second state is a state in which the needle guide is capped at a distal end of the catheter hub.

  6). The needle guide has a body portion having a cavity covering at least a root portion of the catheter, and can be opened and closed with a vicinity of a distal end of the catheter hub as a fulcrum. The first state closes the needle guide. 2. The catheter introduction tool according to claim 1, wherein the catheter hub is covered, and the second state is a state where the needle guide is opened and a root portion of the catheter is exposed.

7). The catheter hub
The catheter introduction tool according to any one of 1 to 6 above, which has a substantially flat bottom surface and left and right side portions that can be gripped from the left and right by a fingertip.

8). A flexible tube provided at the rear end of the catheter hub through which the inner needle is inserted;
A branch pipe having a straight pipe and a side pipe branched from the straight pipe, the flexible tube being fixed to a front end thereof, and the inner needle being inserted into the straight pipe;
A cover member attached to the rear end opening of the straight pipe of the branch pipe and fixed to the rear end of the inner needle, and pulling the cover member from the branch pipe to move the inner needle to the catheter The catheter introduction device according to any one of 1 to 7 above, wherein the catheter introduction device is removed from the catheter.

  9. 9. A drug solution injection system comprising the catheter introduction tool according to any one of 1 to 8 above and a drug solution injection device.

  ADVANTAGE OF THE INVENTION According to this invention, the catheter introduction tool which is easy to puncture and cannot drop easily while the catheter is detained in the blood vessel can be provided.

<Embodiment 1>
An example of the catheter introduction tool (indwelling needle) of the present invention will be described with reference to the drawings.

  In this embodiment, the catheter introduction tool includes a catheter 310, an inner needle 320, a catheter hub 330, a needle guide 380, a flexible tube 350, a branch pipe 360, a cover member 340, and a cap 370, as shown in FIG. Yes. 2 is a cross-sectional view, and FIG. 3 is a cross-sectional view drawn without the inner needle 320. Moreover, in FIG. 2, FIG. 3, it has shown excluding the needle guide.

  The catheter 310 is formed of a soft plastic or elastomer that does not easily damage the blood vessel such as silicone rubber because at least the distal end is placed in the blood vessel, and the rear end is fixed to the catheter hub 330. The catheter hub 330 is hollow so that the drug solution can flow through the catheter.

  The catheter hub 330 is a portion that is gripped with a finger when the subject is punctured with an indwelling needle with the inner needle 320 inserted through the catheter 310. Therefore, it is made of a material that is hard enough to retain its shape, and is made of, for example, plastic or elastomer such as polycarbonate, ABS, polypropylene, polyethylene, soft and hard polyvinyl chloride, polyurethane, silicone rubber, natural rubber, polybutadiene rubber, EP rubber, etc. Is formed.

  The flexible tube 350 is formed of a soft material that can be bent to such an extent that the inside of the tube is not blocked so as to allow some movement of the subject, such as soft polyvinyl chloride.

  The branch pipe 360 has a straight pipe 361 and a side pipe 362, and is connected to the flexible tube 350 at the front end 361a of the straight pipe. In one form, the cover member 340 is attached to the rear end 361b of the straight pipe. It is attached.

  As shown in FIG. 3, the catheter 310, the catheter hub 330, the flexible tube 350, and the branch pipe 360 communicate with each other inside, and the distal side of the straight pipe 361 of the branch pipe is an elastic member 365 such as silicone rubber. The tube through which the chemical solution is fed is connected to the connection port 363 at the end of the side pipe 362 communicating in the branch pipe 360.

  As shown in FIG. 2, the inner needle 320 includes a needle main body 321 and a wire 322 connected to the needle main body. The needle body 321 and the wire 322 pass through the elastic member 365 from the rear end of the branch tube 360, and pass through the internal cavities of the branch tube straight tube 361, the flexible tube 350, the catheter hub 330, and the catheter 310, respectively. The tip of the needle body 321 is exposed from the tip of 310. Since the inner needle main body is made of metal and sharply formed, the subject can be punctured with an indwelling needle formed by a combination of the inner needle and the catheter.

  The cover member 340 connected to the rear end of the branch pipe 360 further includes a tab 341, a bellows 342, and a connection portion 343 connected to the branch pipe 360. In this catheter introducer, when the tab 341 is pulled backward with the indwelling needle punctured by the subject, the wire 322 is connected, so that the inner needle 320 (needle body 321) remains while the catheter 310 remains in the blood vessel. And the wire 322) is pulled out. After the inner needle is pulled out, the rear end of the branch pipe is sealed by the function of the elastic member 365.

  FIG. 4 is a view showing a state where the tab 341 is pulled and the inner needle 320 is pulled out. In this form, the bellows 342 extends and the inner needle 320 is housed in the bellows. Further, the connecting portion 343 is detached from the branch pipe 360 when pulled strongly, and is removed in a form as shown in FIG. Since the inner needle 320 that is sharp and contacts the subject's blood is housed in the cover member 340 having the bellows structure, the operator can safely discard the contaminated needle.

  Further, after the inner needle 320 is pulled out, the rear end of the branch pipe 360 is sealed with a cap 370 in order to completely prevent liquid leakage.

  In the catheter introduction tool of this embodiment, the chemical solution is injected from the tube connected to the connection port 363.

  In the catheter introduction tool of the present invention, as shown in FIG. 1, a needle guide 380 is provided at the front portion of the catheter hub 330 so as to cover the root of the catheter (indwelling needle). The needle guide of this embodiment is removable, and when the needle guide is attached, the length of the catheter exposed first from the needle guide is short, and when the needle guide is removed, the length of the exposed catheter is become longer. That is, the length of the catheter can be adjusted by attaching and detaching the needle guide. That is, in the method of using the catheter introduction tool of the present invention, with the needle guide 380 attached to the catheter 310, the subject is punctured with an indwelling needle by a combination of the inner needle and the catheter, and the catheter is advanced into the blood vessel. Thereafter, as described above, the inner needle 320 is removed. Thereafter, when the needle guide is removed, the root portion of the catheter 310 is exposed, and the catheter is further pushed into the blood vessel. Prior to this additional entry, the majority of the catheter is already in the vessel, allowing the catheter to enter the vessel smoothly. In this way, placing a long catheter into the blood vessel reduces the catheter's shedding from the blood vessel. That is, according to the present invention, it is easy to puncture and a long catheter can be placed in a blood vessel.

  FIG. 5 is a partially enlarged view showing a state where the needle guide 380 covers the root portion of the catheter 310 (that is, the fixed end and the vicinity thereof). A side view of the needle guide 380 (viewed from the needle tip) is shown in FIG. 6, and a front view is shown in FIG. As shown in FIGS. 6 (a) and 7 (a), (b), the needle guide covers the catheter, preferably with the distal end of the catheter hub 330, and has a cut along the direction of the catheter at the bottom. A body 381 having a cavity 383 having an (opening) and two knobs 382 are provided. As shown in FIG. 6B, when the two knobs 382 are picked and an appropriate force is applied, the width of the lower cut of the barrel 381 is widened by the lever principle. When the force is further increased, it opens larger than the outer diameter of the catheter, so that the needle guide can be removed from the catheter.

  The needle guide of this form is formed of a material having elasticity that can perform such a function. Specifically, it is preferably formed of a soft plastic such as polyethylene, soft polyvinyl chloride, polyurethane, silicone rubber, natural rubber, polybutadiene rubber, EP rubber, or an elastomer.

  The length of the needle guide can be selected as appropriate. However, when it is desired to obtain the function of a 25 mm needle at the time of puncture and a 32 mm needle at the time of drug injection, the length of the needle guide covers 7 mm at the base of the catheter. You can choose the size.

<Embodiment 2>
In the second embodiment, an example will be described in which the needle guide and the tip of the catheter hub are fitted to each other to improve the integrity with the catheter hub at the time of puncturing.

  8A and 8B are a top view and a front view of the catheter hub, respectively. The catheter hub 430 of this form has a groove 432 on the distal end side. FIG. 8C shows a state where the needle guide 480 is covered. Details of the needle guide 480 are shown in FIG. 9 {(a) front view, (b) front sectional view, (c) front side view, (d) rear side view, (e) top view}. The needle guide 480 includes a body 481 having a cavity 483 having a cut line below and two knobs 482. The cavity 483 has a large portion covering the catheter hub 430 and a thin portion covering the catheter 310. A convex portion 485 that fits into the groove 432 of the catheter hub 430 is provided inside the cavity 483. By fitting the groove 432 and the convex portion 485 in this way, the integrity of the needle guide and the catheter hub is improved, and the needle guide does not fall forward during use. Further, when a force is applied by pinching the knob 482, it can be easily removed upward and removed.

<Embodiment 3>
Embodiment 3 shows a different form of catheter hub that can be used with needle guide 480 of embodiment 2. As shown in FIG. 10 {(a) front view, (b) top view, (c) front side view, (d) rear side view}, the catheter hub 530 is fitted with the convex portion 485 of the needle guide 480. Although the point which has the groove | channel 532 is the same as that of the catheter hub of Embodiment 2, it has a finger hook convex part 535 further. In addition to facilitating the grasping of the catheter hub by having the finger protrusion, the catheter hub has a flat bottom surface projecting on both sides as shown in FIGS. 10 (c) and (d). Rotation is prevented, and the adhesion to the skin is improved. In this way, it is generally preferable in the present invention to provide the finger hook convex portion as well as the present embodiment.

<Embodiment 4>
In Embodiments 1 to 3, the needle guide is removable, but in the needle guide of Embodiment 4, the needle guide slides along the catheter and is accommodated in the catheter hub. That is, at the time of puncturing, as shown in FIG. 11A, the needle guide 680 is pulled out and used with a short distance to the needle tip. The needle guide 680 can be pushed into the catheter hub 630 as shown in FIG. Since the catheter 310 is fixed to the catheter hub 630, the length of the exposed catheter is increased. Therefore, a long catheter can be used when injecting a chemical solution. There is a cavity through which the catheter passes inside the needle guide, but it may be completely cylindrical or partly cut. If the needle guide does not require elasticity as in this embodiment, it is possible to use a hard material. In addition to the materials described in Embodiment 1, polypropylene, ABS, polycarbonate, polystyrene, A hard plastic such as PMMA may be used.

<Embodiment 5>
In the fifth embodiment, the needle guide has a cap shape. That is, as shown in FIG. 12A, at the time of puncturing, the cap-shaped needle guide 780 is pulled out and used in a state where the distance to the needle tip is short. As shown in FIG. 12B, the needle guide 780 can be fitted to the distal end of the catheter hub 730 so as to cover the distal end portion of the catheter hub 730. Since the catheter 310 is fixed to the catheter hub 730, the length of the exposed catheter is increased. Therefore, a long catheter can be used when injecting a drug solution. Moreover, although the cavity which lets a catheter pass exists in the inside of a needle guide, it may be either a perfect cylinder shape or even if there is a cut | interruption in part. Further, it is preferable that the needle guide and the catheter hub are configured to be fitted and capped.

<Embodiment 6>
In the sixth embodiment, the needle guide has an openable cap shape. That is, as shown in FIG. 13A, when puncturing, the needle guide 880 covers the root portion of the catheter 310 and is used in a state where the distance to the needle tip is short. The needle guide 880 has a cut (opening) in the lower part as in the first embodiment, and as shown in FIG. 13 (b), the front end of the catheter hub 830 is used as a fulcrum, and the front is opened. The root side of the catheter can be exposed. For this reason, the length of the exposed catheter becomes long. Therefore, a long catheter can be used when injecting a chemical solution.

  As described above, the present invention has been described with reference to typical embodiments. As a usable needle guide, the second state in which the covered portion is exposed from the first state in which the root portion of the catheter is covered is shown. Any form may be used as long as the state can be changed.

  In addition, there is no restriction | limiting in particular in the chemical | medical solution injection apparatus which can be used with the catheter introduction tool of this invention. An example of a usable chemical liquid injector is shown in FIG. This chemical solution injection device uses a combination of the injection device main body 110 and the syringe 200, and here, a double head type in which two syringes can be mounted is shown as an example.

  As shown in FIG. 14, the syringe 200 includes a cylinder part 210 and a piston part 220 inserted into the cylinder part 210. The cylinder part 210 has a cylindrical body 211, a conduit part 212 is formed at the front end, and a cylinder flange 213 is formed at the outer periphery of the rear end. A piston flange 221 is formed on the outer periphery of the rear end of the piston member.

  The syringe is filled with a predetermined chemical solution. In a preferred embodiment of the present invention, the catheter introduction tool is used for injecting a contrast medium. For example, the syringe 200C is filled with a contrast agent, and the syringe 200P is filled with physiological saline. Syringe 200C may be either a so-called prefilled type in which a contrast medium is filled in advance, or a refill type in which an empty syringe is filled with a contrast medium from a bottle.

  The injection device main body 110 receives the cylinder portion 210 of the syringe through the two semi-cylindrical recesses 114 and holds the piston flange 221 of the syringe through the pressing portion 117. Then, the piston 220 is moved relative to the cylinder portion 210 to inject or suck the chemical solution in the syringe. Although not shown, the injection device main body 110 is provided with a drive unit that drives the pressing unit 117. Usually, although not shown, a control unit and a monitor connected to the injection device main body 110 by wire or wirelessly exist separately.

  As shown in FIG. 14, a tube 390 for injection is attached to the tips of the syringes 200C and 200P. The tube 390 is connected to the connection port 363 of the catheter introduction tool via a valve and / or a branch pipe as necessary.

  As described above, a chemical solution such as a contrast medium can be injected into a subject using the catheter introduction tool and the chemical solution injection device.

It is a figure which shows one example of a catheter introduction tool. It is a figure which shows one example of a catheter introduction tool. It is a figure which shows one example of a catheter introduction tool. It is a figure which shows a mode that the inner needle was accommodated in the cover member. It is a figure which shows the example of a catheter hub and a needle guide. It is a figure explaining the detail of one example of a needle guide. It is a figure explaining the detail of one example of a needle guide. It is a figure which shows one example of a catheter hub. It is a figure explaining the detail of one example of a needle guide. It is a figure which shows one example of a catheter hub. It is a figure which shows an example of a catheter hub and a needle guide. It is a figure which shows an example of a catheter hub and a needle guide. It is a figure which shows an example of a catheter hub and a needle guide. It is a figure which shows an example of the chemical injection device which can be used for this invention. It is a figure which shows the conventional catheter introduction tool. It is a figure which shows typically a mode that the chemical | medical solution is inject | poured into the blood vessel.

Explanation of symbols

310 Catheter 320 Inner needle 321 Needle body 322 Wire 330, 430, 530, 630, 730, 830 Catheter hub 340 Cover member 350 Flexible tube 360 Branch pipe 370 Cap 380, 480 Needle guides 381, 481, Body 382, 482 Knob 383, 483 Cavity 432 Groove 485 Projection 535 Finger engagement projection

Claims (9)

In a catheter introduction device having a catheter placed in a blood vessel, a catheter hub to which the catheter is fixed, and an inner needle that can be inserted into and removed from the catheter and the catheter hub,
It is possible to change from the first state covering the root portion of the catheter to the second state where the portion covered in the first state is exposed, and is made of a material harder than the catheter. A catheter introduction tool having a formed needle guide.   The needle guide is removable and has a body having a cavity that covers at least a root portion of the catheter, the first state is a state in which the needle guide is fitted, and the second state is 2. The catheter introduction tool according to claim 1, wherein the needle guide is removed.   The needle guide has at least a base portion of the catheter that covers at least the root portion of the catheter and has a cavity having a cut below, and two knobs provided above the outer surface of the barrel portion. The catheter introduction tool according to claim 2, wherein the cut becomes larger and the needle guide can be detached from the catheter by gripping the needle guide.   The needle guide has a body having a cavity that covers at least a root portion of the catheter, can be slid along the catheter and can be accommodated in the catheter hub, and the first state includes the needle guide. The catheter introduction device according to claim 1, wherein the catheter guide is pulled out from the catheter hub, and the second state is a state where the needle guide is housed in the catheter hub.   The needle guide has a body portion having a cavity covering at least a root portion of the catheter, and can slide along the catheter to cap the distal end of the catheter hub. The catheter introduction tool according to claim 1, wherein the needle guide is pulled out from the catheter hub, and the second state is a state in which the needle guide is capped at a distal end of the catheter hub.   The needle guide has a body portion having a cavity covering at least a root portion of the catheter, and can be opened and closed with a vicinity of a distal end of the catheter hub as a fulcrum. The first state closes the needle guide. The catheter introduction tool according to claim 1, wherein the catheter hub is covered, and the second state is a state where the needle guide is opened and a root portion of the catheter is exposed. The catheter hub
The catheter introduction device according to any one of claims 1 to 6, further comprising: a substantially flat bottom surface; and right and left side surfaces that can be gripped from the left and right by a fingertip. A flexible tube provided at the rear end of the catheter hub through which the inner needle is inserted;
A branch pipe having a straight pipe and a side pipe branched from the straight pipe, the flexible tube being fixed to a front end thereof, and the inner needle being inserted into the straight pipe;
A cover member attached to the rear end opening of the straight pipe of the branch pipe and fixed to the rear end of the inner needle, and pulling the cover member from the branch pipe to move the inner needle to the catheter The catheter introduction device according to any one of claims 1 to 7, wherein the catheter introduction device is removed from the catheter.   A drug solution injection system comprising the catheter introduction tool according to claim 1 and a drug solution injection device.

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