JPH0428390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a catheter placement device for placing a catheter in an arterial or venous blood vessel of a patient. Attached to the catheter, anticoagulant,
The present invention relates to a device for constantly infusing a small amount of a medical solution such as an anticancer drug into a patient's blood vessel.

(Conventional technology) Conventionally, when treating diseases, testing, nutritional supplements, etc.
A catheter insertion method called the Seldinger method is used to place a catheter in a patient's artery or vein.

In this method, as shown in FIGS. 9a to 9g, first, a needle (inner trocar) 11 inserted into a cannula (outer cannula) 10 is inserted into the cannula's tip 1.
After protruding the needle tip 11a from 0a, it is inserted into blood vessels A such as arteries and veins through the patient's skin.
(see Figure 9a). Thereafter, the needle 11 is removed from the cannula, and after confirming that blood flows out from the opening at the rear end 10b of the cannula (see Figure 9b), the guide wire 12 with a bent tip is inserted into the blood vessel via the cannula 10. A
After inserting the cannula 10 into the
(See figures c and d). And this guide wire 1
Insert the introducer sheath (catheter) 13 into the blood vessel A along the guide wire 12.
was removed, and only the sheath 13 was left indwelling within the blood vessel A (see Figure 9g).

In this case, if the sheath 13 has a large diameter and is difficult to insert, a needle-shaped blood vessel dilator sheath dilator 14 may be inserted into the sheath 1.
The dilator 14 is made to protrude from the sheath tip 13a, and the sheath and the sheath are smoothly inserted into the blood vessel together with the dilator.
2 and the dilator 14 were removed, and only the sheath 13 was placed in the blood vessel A (9e~
(See figure g).

Then, from this sheath, that is, the rear end side of the catheter, another catheter for medicinal fluid can be inserted into this catheter to inject the medicinal fluid into the blood vessel, or a syringe can be inserted into the attachment part provided at the rear end of this catheter. He was wearing a blood vessel to collect blood vessels for testing.

When the catheter is placed in the patient's blood vessel in this way, depending on the patient's symptoms, it may take up to 1 week to 1 week.
There are cases where the catheter must be left in place for a long period of time, for about several months, but in such cases, blood coagulation occurs near the part of the catheter left in the blood vessel, causing thrombus.

Therefore, conventionally, in order to prevent the occurrence of blood coagulation, doctors and nurses either change the position of the catheter every 2 to 3 days or administer a blood clotting inhibitor such as heparin with a syringe,
Infusion can be done using a drug catheter connected to a pump, or the catheter itself can be made of silicone,
The catheter was made of so-called antithrombotic materials such as PVC and urethane, or the surface of the catheter was coated with anticoagulant agents such as silicone and heparin.

Furthermore, depending on the patient's case, it may be necessary to inject medical solutions such as anti-cancer drugs or nutritional supplements, but in this case too, doctors or nurses perform the same treatment as described above.

(Problems to be Solved by the Invention) As described above, it is difficult to indwell a catheter in a patient's blood vessel for a long period of about one week to one month, and even if such long-term indwelling is carried out,
Conventional methods for preventing the occurrence of blood coagulation have had the following problems. In other words, (1) the method of changing the placement position of the catheter every 2 to 3 days causes pain to the patient and imposes a human burden on the doctor or nurse; (2) When injecting an anticoagulant such as heparin into an infusion using an appropriate syringe or a medicinal catheter connected to a pump, the amount of inflow of the medicinal solution varies depending on the severity of the patient's symptoms, and the amount of injection must be adjusted delicately. (3) The catheter itself must be made of so-called antithrombotic material, or the catheter itself must be made of so-called antithrombotic material. However, with the method of coating the surface of the catheter with an anticoagulant, there were various problems such as the expected effect not being obtained due to the outflow of the applied drug solution when the catheter was left in place for a long period of time.

Furthermore, when injecting medical solutions such as anticancer drugs and nutritional supplements, the same problems as described in (1) to (3) arise.

Therefore, in the medical field, it is possible to indwell a catheter in a patient's blood vessel for a long period depending on the case, and even in such long-term indwelling, blood coagulation does not occur near the part of the catheter indwelled in the blood vessel. It does not cause blood clots and can be treated with various treatments.
The reality is that there is a demand for a catheter placement device that can perform tests and other tests at the same time.

(Means for Solving the Problems) The present invention was invented in view of the problems and objectives of the prior art described above, and the catheter indwelling device according to the present application is capable of indwelling a catheter in an artery or vein of a patient. A catheter indwelling device for indwelling a patient, which comprises: a hollow, substantially cylindrical sheath or catheter with both ends open, one end of which is to be indwelled in a blood vessel of a patient; and a catheter that is inserted into the catheter from the other end in a detachable manner. and a cartridge-shaped chemical tank removably connected to the other end of the chemical liquid inflow adjusting member, wherein the chemical liquid inflow adjusting member has a portion extending in the longitudinal direction of its outer surface. At least one groove or slit is formed, the other end of the groove or slit being connected to the chemical tank side, whereby the chemical liquid in the chemical liquid tank is transferred to the chemical liquid tank by a capillary phenomenon. This catheter indwelling device is characterized in that it is configured such that a small amount of drug solution constantly flows into the patient's blood vessel from inside the catheter through the groove or slit of the inflow adjustment member.

Further, in the catheter indwelling device of the present application, in the above-mentioned catheter indwelling device, the cartridge-shaped drug solution tank is formed of a flexible material, and by pushing the drug solution tank, a desired amount of drug solution is delivered from the drug solution tank via the catheter. It is characterized by being configured to flow into a patient's blood vessel.

(Example) Hereinafter, regarding the catheter placement device of the present invention,
This will be explained in more detail based on the accompanying drawings.

In FIG. 1, 1 is an introducer sheath, that is, a catheter (hereinafter simply referred to as "catheter"), 2 is a drug liquid inflow adjustment member,
3 indicates a chemical solution tank.

The catheter 1 has one end 1a connected to the patient's artery.
It is placed in the venous blood vessel A and is well known. Its shape is a hollow, approximately cylindrical shape with both ends open, and the other end 1b is used for various treatments for the patient, such as blood sampling, testing, and intravenous drip, for example.
An adapter Ic is provided so that blood can be collected using a syringe, or a well-known three-way cot can be detachably attached. The shape of this adapter is also well known, but to put it simply, it is designed so that it can be removably screwed onto the outer periphery of the open end of the adapter Ic with a female screw threaded on the inner periphery of the attachment site of a syringe, pot, etc. protrusion or male screw 1d, 1d
is formed. Note that a well-known fixed wing member B for holding the catheter 1 is attached to the catheter 1 as appropriate by sewing it onto the patient's skin.

The drug solution inflow adjustment member 2 is connected to the catheter 1 described above.
The chemical liquid in the chemical liquid tank is inserted into the inside of the chemical liquid tank.
Capillary phenomenon is ensured so that a small amount of liquid medicine always flows from the catheter 1 into the patient's blood vessel from the liquid medicine tank 3 via the inflow amount adjustment member 2.
This is an application of the phenomenon.

Specifically, the chemical liquid inflow amount adjusting member 2 is a hollow adjusting member main body 2a having a substantially cylindrical shape with one end open.
and an adapter 2c having a similar configuration to the adapter 1c of the catheter 1 described above, which is provided on the liquid medicine tank 3 side of the adjustment member main body.

A groove 2e extending to the tip 2d of the adjustment member body 2a is formed in the longitudinal direction of the outer surface of the adjustment member body 2a, and the other end 2f of this groove is formed on the outer surface of the adjustment member body 2a.
Adjustment member main body 2 communicating with cavity 2b inside a.
It communicates with a small hole 2g bored at an appropriate location in a. In the case of this embodiment, the groove 2e described above is made into a single line, but it is possible to form a plurality of grooves as appropriate depending on the amount of chemical liquid to be inflowed per unit time, and to form the small hole 2g to be drilled. Those skilled in the art will easily understand that the position can be changed as appropriate.

Furthermore, as shown in FIG. 2, when the drug solution inflow rate adjusting member 2 is inserted into the catheter 1 and attached, a small flow path can be formed between the aforementioned groove 2e and the inner wall of the catheter 1. Therefore, the outer diameter of the adjustment member main body 2a is designed to approximately match the inner diameter of the catheter 1 (see FIG. 3). Furthermore, the adjustment member main body 2a side of the adapter 2c has a generally conical shape that fits tightly when the drug solution inflow amount adjustment member 2 is inserted into the catheter 1 and prevents the drug solution from flowing out or air from entering. Closed part 2h
is formed.

As shown in FIG. 4, the chemical liquid tank 3 has a cartridge shape, and includes a chemical liquid tank main body 3a that accommodates a blood coagulation inhibitor such as heparin inside the chemical liquid tank, and an adapter 2c for the adjustment member 2 described above. Adapter 3 for detachably connecting to
It is composed of c.

The chemical liquid tank main body 3a is a chemical liquid storage tank 3b.
, a partition wall 3d provided inside the chemical liquid tank main body 3a, and a connecting portion 3d' extending from the outer circumferential wall of the chemical liquid tank main body 3a for detachably connecting to the adapter 3c. A threaded groove is formed on the outer periphery of the connecting portion 3d', so that it can be freely attached to and detached from the adapter 3c as described later, and even when the chemical liquid tank main body 3a is attached to the adapter 3c, the chemical liquid tank main body 3a and the adapter 3c are connected. It is constructed to prevent the chemical solution from leaking between the parts. If a well-known filter that allows liquid to pass but does not allow gas to pass is provided near the inside of the partition wall 3d of the chemical liquid tank body 3a, it is possible to avoid air bubbles from flowing into blood vessels that are undesirable to the human body.

The adapter 3c includes an adapter body 3e, a mounting portion 3f provided at both ends of the adapter body 3e, and for detachably connecting to the adapter 2c of the chemical liquid inflow amount adjusting member 2, and a connecting portion 3d' of the chemical liquid tank 3. It is composed of a mounting part 3g for detachably connecting. In addition, adapters 2 of the chemical liquid inflow amount adjusting member 2 are attached to both the mounting portions 3f and 3g, respectively.
A female thread is formed on the inner periphery so that it can be screwed into the protrusion or male screw formed on the outer periphery of the chemical liquid tank body 3a, and the protrusion or male thread formed on the outer periphery of the connecting portion 3d' of the chemical solution tank body 3a. ing. Furthermore, the attachment part 3g of the adapter 3c has a chemical liquid tank main body 3a.
When the adapter 3c is screwed onto the adapter 3c, a tubular protrusion 3i is formed which comes into contact with a partition wall 3d provided inside the chemical tank main body 3a and forms an outflow hole 3h in the partition wall 3d. ing. Note that a protrusion having the same structure as this protrusion is attached to the adapter 3c.
If it is provided in the other mounting part 3f of the adapter 3c, both the mounting parts 3f and 3g of the adapter 3c can be used together. Alternatively, instead of providing the partition wall 3d, a lid that can be screwed onto a protrusion or a male screw formed on the outer periphery of the connection part 3d' of the chemical tank main body 3a is used to remove the chemical liquid from the chemical liquid tank 3 before use. It may also be possible to prevent leakage.

Hereinafter, a method of using the catheter indwelling device of the present invention will be explained based on the accompanying drawings, FIGS. 5a to 5c.

First, one end 1a of the catheter 1 is placed in the patient's arterial/venous blood vessel A based on the conventional catheter insertion method called the Seldinger method described above (see FIG. 5a).

Next, the adjustment member main body 2 of the chemical liquid inflow amount adjustment member 2
Insert the part a into the catheter 1, and close the drug liquid inflow amount adjusting member 2 to the catheter 1 using the closing part 2h formed on the adjusting member main body 2a side of the adapter 2c.
Attach it by locking it.

Then, the connection part 3 of the chemical tank body 3a is inserted into the female screw formed in the attachment part 3g of the adapter 3c.
d' and attach the chemical tank main body 3a to the adapter 3c. At this time, as mentioned above, the partition wall 3d provided inside the chemical tank main body 3a
Then, an outflow hole 3h is formed in the partition wall 3d by contacting the protrusion 3i provided on the mounting portion 3g (see Fig. 5b).

Finally, the adapter 2 of the chemical liquid inflow adjustment member 2
By screwing the female screw formed on the inner periphery of the attachment part 3f to the protrusion or male screw formed on the outer periphery of c, the chemical liquid can be removed with the chemical liquid tank main body 3a attached to the adapter 3c. When the tank 3 is attached to the drug solution inflow amount adjusting member 2, the attachment of the catheter indwelling device of the present invention is completed (see Fig. 5c).

In this state, from the chemical tank 3, the cavity 2b, the small hole 2g, the groove 2e inside the adjustment member main body 2a.
From there, a flow path C leading to the inside of the catheter 1 is formed, and the two liquids, the blood vessel and the drug, in the catheter 1 are liquid-coupled, and the interfacial tension changes due to blood flow pulsation pressure on the blood vessel side, causing movement of the interface. The chemical liquid in the chemical liquid tank 3 flows through the groove 2e of the chemical liquid inflow amount adjusting member 2 from the chemical liquid tank 3 due to the so-called capillary phenomenon due to the groove 2e.
Through the catheter 1, a small amount of fluid constantly flows into the patient's blood vessel A.

Note that if the injection of medical fluid is not necessary, the medical fluid inflow amount adjustment member 2 may be inserted into the catheter 1 as appropriate.
Those skilled in the art will recognize that if a well-known three-way socket (not shown) is attached to the adapter 1c of the catheter 1, various treatments such as blood sampling, testing, and intravenous drip can be performed on the patient as appropriate. It will be easy to understand.

Moreover, FIG. 6 shows another embodiment of the drug solution inflow amount adjusting member of the catheter indwelling device of the present invention. This chemical liquid inflow rate adjusting member has basically the same configuration as the chemical liquid inflow rate adjusting member 2 of the above-described embodiment (the same reference numerals are given to the same components), but the difference is that the small hole 2g, a single groove 2e is formed in the longitudinal direction of the outer surface of the adjustment member main body 2a over its entire length, reaching the tip 2d of the adjustment member main body 2a. Channel 2 communicating with internal cavity 2b
This is the point where g′ was set. Therefore, its function is basically the same as that of the chemical liquid inflow amount adjusting member 2 of the above-described embodiment.

Furthermore, FIG. 7 shows still another embodiment of the drug solution inflow amount adjusting member of the catheter indwelling device of the present invention. This chemical liquid inflow rate adjusting member has basically the same configuration as the chemical liquid inflow rate adjusting member 2 of the first embodiment described above, but the difference is that in the longitudinal direction of the outer surface of the adjusting member main body 2a, Instead of forming a single groove 2e that reaches the tip 2d of the adjustment member main body 2a, a single longitudinal slit 2e' is provided. Therefore, its function is basically the same as that of the chemical liquid inflow amount adjusting member 2 of the above-described embodiment.

In the case of this embodiment, the slit 2e' is one line, but it is possible to form a plurality of grooves as appropriate and to adjust the length of the slit 2e' as appropriate depending on the amount of chemical liquid that should flow in per unit time. Those skilled in the art will readily understand that modifications may be made.

Furthermore, FIG. 8 shows another embodiment of the drug solution tank of the catheter indwelling device of the present invention.
The difference from the first embodiment described above is that the chemical liquid tank body 3a of the chemical liquid tank 3 is made into a balloon shape made of a flexible material, a pipe 3j is arranged in the chemical liquid tank body 3a, and the other end is an adapter. The adapter 3 has a male screw or a protrusion formed on its outer periphery so that it can be detachably attached to the attachment part 3g of the adapter 3c.
The difference is that k is provided.

That is, even with this configuration, a small amount of drug solution always flows into the patient's blood vessel A from the catheter 1 through the groove 2e of the drug solution inflow amount adjustment member 2 from the drug solution tank 3, but it is necessary to inject a large amount of drug solution at once. In some cases, by pressing the chemical tank main body 3a,
A desired amount of drug solution is transferred from the drug solution tank 3 to the catheter 1.
The fluid is configured to flow into the patient's blood vessel A through the blood vessel A.

In this case, instead of adapter 3c,
By attaching a well-known 3-way pot (not shown) and attaching this drug tank main body 3a to one pot side via an adapter 3k, blood collection, testing, and infusion can be carried out from the other pot side as appropriate. Those skilled in the art will readily understand that various treatments are possible for patients.

In addition, in order to increase the blood coagulation inhibiting effect, the drug solution inflow rate adjusting member of the catheter indwelling device of the present invention may be made of a so-called antithrombotic material such as silicone, PVC, or urethane, or the drug solution inflow rate may be adjusted as in the conventional method. Of course, it is also possible to coat the surface of the adjustment member with an anticoagulant such as silicone or heparin.

(Operation/Effect) According to the catheter indwelling device of the present invention, the cavity inside the drug solution inflow amount adjustment member from the drug solution tank,
A flow path leading to the inside of the catheter is formed through the groove or slit, and the two liquids in the catheter, blood and drug, are combined, and the interfacial tension changes due to blood pulsation pressure on the blood side, causing movement of the interface. occurs, and due to the so-called capillary phenomenon caused by the grooves or slits, the medicinal solution in the medicinal solution tank constantly flows in small amounts from the catheter into the patient's blood vessel through the grooves or slits of the medicinal solution inflow amount adjustment member. It is configured as follows.

Therefore, depending on the case, the catheter can be left in the patient's blood vessel for a long period of time (about 1 week to 1 month), and even during such long-term indwelling, blood coagulation does not occur near the part of the catheter where the catheter is left in the blood vessel. figure,
Extremely simple and excellent catheter placement that does not cause blood clots, allows various treatments and tests to be performed at the same time, and eliminates the human burden on doctors and nurses as well as pain on patients. equipment can be provided.

Further, in the catheter indwelling device of the present invention, the drug solution tank is formed of a flexible material, and by pushing the drug solution tank, a desired amount of drug solution flows from the drug solution tank into the patient's blood vessel via the catheter. The present invention provides an even more excellent catheter indwelling device that not only has the above-mentioned functions and effects, but also can handle cases where it is necessary to inject a large amount of medical fluid at once. It is something.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the catheter indwelling device of the present invention, FIG. 2 is a longitudinal cross-sectional view showing the catheter indwelling device in which the drug fluid inflow adjustment member of the present invention is inserted into the catheter, and FIG. , FIG. 4 is a longitudinal sectional view of the drug solution tank of the catheter indwelling device of the present invention, and FIG. 5 is a sectional view taken along the - line in FIG.
6 and 7 are respectively perspective views showing another embodiment of the drug solution inflow adjustment member of the catheter indwelling device of the present invention, and FIG. 8 is a diagram showing how to use the catheter indwelling device of the present invention. FIG. 9, a longitudinal cross-sectional view showing another embodiment of the drug tank of the catheter indwelling device of the present invention, is a diagram illustrating the Seldinger method, which is a conventional method of indwelling a catheter. DESCRIPTION OF SYMBOLS 1...Catheter, 1c...Adapter, 1d...Protrusion part or male screw, 2...Medicinal fluid inflow adjustment member, 2a
...adjustment member body, 2c...adapter, 2e...groove,
2g...small hole, 2h...closed part, 3...chemical tank,
3a...Medical solution tank body, 3b...Medical solution storage tank,
3c...adapter, 3d...partition wall, 3d'...connecting part, 3e...adapter body, 3f, 3g...attachment part, 3h...outflow hole, 3i...projection, 2g'...channel,
2e'...slit, 3j...pipe, 3k...adapter,
DESCRIPTION OF SYMBOLS 10... Cannula (outer tube), 11... Needle (internal trocar), 12... Guide wire, 13... Introducer sheath (catheter), 14... Sheath dilator, A... Blood vessel, B... Fixed wing member, C... Flow Road.

Claims (1)

[Scope of Claims] 1. A catheter indwelling device for indwelling a catheter in an arterial or venous blood vessel of a patient, which comprises a hollow, substantially cylindrical sheath with open ends, one end of which is to be indwelled in the patient's blood vessel. That is, from a catheter, a drug solution inflow amount adjusting member that is detachably fitted and inserted into the catheter from the other end, and a cartridge-shaped drug solution tank that is detachably connected to the other end of the drug solution inflow amount adjusting member. The chemical liquid inflow amount adjusting member has at least one groove or slit partially formed in the longitudinal direction of its outer surface extending to its tip, and the other end of the groove or slit communicates with the chemical liquid tank side, As a result, due to capillary action, the medical liquid in the medical liquid tank is configured to constantly flow in small amounts from the medical liquid tank into the patient's blood vessel from inside the catheter through the groove or slit of the medical liquid inflow amount adjusting member. A catheter placement device characterized by: 2. The cartridge-shaped medical solution tank is formed of a flexible material, and is configured such that by pushing the drug solution tank, a desired amount of the drug solution flows from the drug solution tank into the blood vessel of the patient via the catheter. The catheter indwelling device according to claim 1.