JP2001137350A - Hemodialysis catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hemodialysis catheter capable of preventing thrombus from generating easily and reliably when blood is not purified. SOLUTION: A hemodialysis catheter comprises an inner cylinder 1 provided with a lumen 13 for a guide wire, a blood feeding lumen 14 communicating with the outside through a blood feeding opening 11, a blood feeding lumen 15 communicating with the outside through a blood withdrawal opening 12, and an outer cylinder 2 provided with an opening/closing means (holes 21, 22, etc.), for the blood feeding opening 11 and the blood withdrawal opening 12. When the blood feeding opening 11 and the blood withdrawal opening 12 of the inner cylinder 1 are opened by the opening/closing means, blood feeding and blood withdrawal can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemodialysis catheter used for emergency blood purification and the like.
Means are provided for preventing the blood supply lumen and blood removal lumen from being blocked during non-blood purification.

[0002]

2. Description of the Related Art Emergency blood purification treatment is usually repeated over several weeks, several days, and several hours. Therefore,
The catheter for hemodialysis used for emergency blood purification treatment is indwelled in the blood vessel even during non-treatment,
Blood may enter the blood feeding lumen or the blood removing lumen from the blood feeding port or the blood removing port, and a thrombus may be formed to block the lumen. Therefore, in order to prevent the lumen from being obstructed, a heparin lock method, a heparinized saline continuous infusion method, and an opturator method have conventionally been adopted. Heparin lock method is a method of filling the rumen with heparinized raw food,
Flush the rumen with a heparinized saline diet and confirm that there is no blockage before resuming treatment. In addition, the heparinized saline continuous infusion method is a method of continuously flowing a small amount of heparinized saline stored in a container such as a balloon into the lumen to prevent blood from flowing into the lumen.
The opturator method is a method in which a thin tube (opturator) is inserted into the lumen during non-blood purification to prevent blood from flowing into the lumen.

[0003] However, the above-mentioned heparin lock method and the continuous infusion of heparinized saline are not able to completely prevent the inflow of blood, and although improved, they cannot completely prevent the formation of blood clots. is there. In addition, the opturator method is economically problematic because the opturator is relatively expensive and is disposable (disposable product).

[0004] In order to solve the above-mentioned problems, a double lumen catheter has been proposed in which heparin lock can be effectively maintained during non-treatment (JP-A-11-402). This one is
An inner cylinder having a blood supply cavity and a blood supply port, an outer cylinder through which the inner cylinder is inserted and having a blood removal cavity between the inner cylinder, and a first molded body coupled to a base of the outer cylinder; A second molded body fitted to the base of the first embodiment and coupled to the base of the inner cylinder, wherein a plurality of slits provided in the side wall of the outer cylinder are formed by the first molded body and the second molded body; Characterized in that it is opened and closed by holding means provided on the molded body of (1). However, this method cannot completely prevent blood inflow from the blood supply port side, so that it cannot be said that thrombus formation can be completely prevented.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a hemodialysis catheter that can easily and reliably prevent thrombus formation during non-blood purification. I do.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have conceived a method of providing an outer cylinder to close a blood supply port and a blood removal port. Was completed. That is, the present invention has a distal end and a proximal end, a blood supply port and a blood removal port are provided on a side wall of the distal end, a guide wire lumen penetrating from the proximal end to the distal end, and a distal end from the proximal end, respectively. An inner cylinder provided with a blood supply lumen and a blood removal lumen that penetrates the blood supply port and the blood removal port of the section, and a cylindrical body in which the inner cylinder is inserted in a liquid-tight manner; An outer cylinder that is shorter than the inner cylinder, wherein a means for opening and closing the blood supply port and the blood removal port is provided on the side wall of the distal end portion. The present invention relates to a hemodialysis catheter that enables blood supply and blood removal when a blood supply port and a blood removal port of a cylinder are opened. Here, the opening / closing means may be two holes or two slits provided at the distal end of the outer cylinder corresponding to the blood supply port and the blood removal port, respectively. Even if the two holes or slits overlap with the corresponding blood supply port and blood removal port by moving the inner cylinder around the axis,
One hole or slit may be overlapped with the corresponding blood supply port and blood removal port. In the case where the opening / closing means is a hole, it is preferable to form a groove in the distal end portion of the outer cylinder from the hole to the distal end so that the blood supply port and the blood removal port are not closed by blood vessels. In addition, it is preferable that an opening confirmation mark is provided on each of the base ends of the inner cylinder and the outer cylinder so that the opening of the blood supply port and the blood removal port can be confirmed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing one embodiment of the present invention, FIGS. 2 to 5 are plan views showing another embodiment of the present invention, and FIGS. FIG. 10 is a cross-sectional view of a plane passing through the center, and FIG. 10 is a diagram illustrating a state in which the inner tube is moved to the distal end side in FIG. 1 and the blood supply port and the blood removal port are opened to the outside. As shown in FIGS. 1 to 9, the blood dialysis catheter of the present invention comprises a guide wire lumen 13 and a blood feeding lumen 1 communicating with the outside at a blood feeding port 11.
4. An inner cylinder 1 provided with a blood supply lumen 15 communicating with the outside at the blood removal port 12, and opening and closing means (holes 21, 22, etc.) for the blood supply port 11 and the blood removal port 12 on the side wall of the distal end portion, respectively. And an inner cylinder 1 provided by an opening / closing means.
When the blood supply port 11 and the blood removal port 12 are opened to the outside, blood supply and blood removal can be performed.

The inner cylinder 1 is usually formed of a flexible resin such as polyurethane, polyethylene, polypropylene, polyamide, polyester, or fluororesin (for example, polytetrafluoroethylene or the like) and has a distal end and a proximal end. A blood supply port 11 and a blood removal port 12 are provided on the side wall of the distal end portion, a guide wire lumen 13 penetrating from the base end to the distal end, and a blood supply extending from the base end to the distal end. A lumen 14 and a blood removal lumen 15 are provided, and the blood supply lumen 14 and the blood removal lumen 15 communicate with the blood supply port 11 and the blood removal port 12 at the distal end, respectively. The extension tubes 4 and 5 are respectively connected to the base ends of the fifteen, and the blood purification devices (not shown) are connected to the base ends of the extension tubes 4 and 5 respectively. Connector 4 that connects the cube, etc.
1, 42 are provided.

The outer cylinder 2 is usually a cylinder made of the same material as the inner cylinder 1 and has a distal end and a proximal end. Outer cylinder 2
A longer inner cylinder 1 is inserted in a liquid-tight manner, and a blood supply port 11 and a blood removal port 12
Are provided respectively for opening and closing. The opening and closing means of the outer cylinder 2 causes the blood feeding port 11 and the blood removal port 1 of the inner cylinder 1 to be opened.
When 2 is opened to the outside, blood supply and blood removal become possible. Here, if overlapping confirmation marks 16 and 25 are provided at the base ends of the inner cylinder 1 and the outer cylinder 2, respectively,
By adjusting the position of the mark 25 to the blood inlet 1
1 and the opening of the blood removal port 12 to the outside can be automatically confirmed. For example, in FIG. 1, if the inner cylinder 1 is moved to the distal end side to a position where the distal ends of the marks 16 and 25 abut against each other, as shown in FIG. The second hole 22 and the blood removal port 12 overlap, and the blood supply port 11 and the blood removal port 12 are opened to the outside, so that blood supply and blood removal can be performed. In the drawing, reference numeral 3 denotes a wing for fixing the catheter to the skin, which may be fixed to the outer cylinder 2 or may be rotatably inserted.

The opening / closing means may be two slits 23 and 24, even if two holes 21 and 22 are provided at the distal end of the outer cylinder 2 corresponding to the blood supply port 11 and the blood removal port 12, respectively. May be. As a method of opening the blood supply port 11 and the blood removal port 12 to the outside by the opening / closing means, the inner cylinder 1 is moved to the distal end side (the outer cylinder 2 may be moved to the proximal end side). Holes 21, 22 or slits 23, 24
And a method in which the blood supply port 11 and the blood removal port 12 corresponding to each overlap, and a method in which the inner cylinder 1 is rotated around an axis (the outer cylinder 2 may be rotated). A method can be adopted in which the holes 21 and 22 or the slits 23 and 24 are overlapped with the corresponding blood supply port 11 and blood removal port 12, respectively.

1 (FIG. 6) and FIG. 2 (FIG. 7), a blood supply port 11 and a blood removal port are provided axially symmetrically on the outer wall of the distal end of the inner cylinder 1, and the distal end of the outer cylinder 2 is provided. The first hole 21 and the second hole 22 are provided axially symmetrically in the portion. In the apparatus shown in FIG. 1, the first hole 21 and the blood supply port 11 overlap with each other by moving the inner cylinder 1 to the distal end side, and the second hole 2
2 and the blood removal port 12 overlap with each other, so that the blood supply port 12 and the blood removal port 12 are opened to the outside. As shown in FIG. The first hole 21 and the blood supply port 11 overlap, the second hole 22 and the blood removal port 12 overlap, and the blood supply port 12 and the blood removal port 12 are opened. Here, the opening and closing means is the hole 2
In the case of Nos. 1 and 22, as shown in FIG. 5, grooves 211 and 221 are formed in the distal end portion of the outer cylinder 2 so as to pass from the holes 21 and 22 to the distal end, so that the blood supply port 11 and the blood removal port 12 are vascular. 3 (FIG. 8) and FIG. 4 (FIG. 9)
The blood supply port 11 and the blood removal port are provided axially symmetrically on the outer wall of the distal end of the inner cylinder 1, and the first slit 23 and the second slit 24 are provided axially symmetrically on the distal end of the outer cylinder 2. so,
Since the first and second slits 23 and 24 are open on the distal end side, the blood supply port 11 and the blood removal port 12 opened into the slits 23 and 24 are not closed by blood vessels. FIG. 3 shows that by moving the inner cylinder 1 to the distal end side, the first slit 23 and the blood supply port 11 overlap,
The second slit 24 and the blood removal port 12 overlap with each other so that the blood supply port 12 and the blood removal port 12 are opened, and the inner cylinder 1 is moved to the distal end side as shown in FIG. Thereby, the first slit 23 and the blood supply port 12 overlap,
The second slit 24 and the blood removal port 12 overlap, and the blood supply port 11 and the blood removal port 12 are opened to the outside.

[0012]

As is apparent from the above description, by using the hemodialysis catheter of the present invention, a simple operation of moving the inner cylinder to the distal end side or rotating the inner cylinder around the axis is realized. In, since the blood supply port and the blood removal port can be opened or closed to the outside by the outer cylinder,
By closing the blood supply port and the blood removal port during non-blood purification, thrombus formation can be easily and reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a plan view showing another embodiment of the present invention.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a plan view showing another embodiment of the present invention.

FIG. 5 is a plan view showing another embodiment of the present invention.

FIG. 6 is a sectional view of a plane passing through the center of the opening / closing means of FIG. 1;

FIG. 7 is a cross-sectional view of a plane passing through the center of the opening / closing means of FIG. 2;

8 is a cross-sectional view of a plane passing through the center of the opening / closing means of FIG.

9 is a cross-sectional view of a plane passing through the center of the opening / closing means in FIG.

FIG. 10 is a view showing a state in which the inner cylinder is moved to the distal end side in FIG. 1 to open a blood supply port and a blood removal port to the outside.

[Explanation of symbols]

 Reference Signs List 1 inner cylinder 11 blood supply port 12 blood removal port 13 guide wire lumen 14 blood supply lumen 15 blood removal lumen 16 release confirmation mark 2 outer cylinder 21 first hole 211 groove 22 second hole 221 groove 23 first slit 24 Second slit 25 Opening confirmation mark 3 Wing 4 Extension tube 41 Connector 5 Extension tube 51 Connector

Claims (9)

[Claims] A blood supply port and a blood removal port provided on a side wall of the distal end, a guide wire lumen penetrating from the proximal end to the distal end, and a distal end from the proximal end, respectively. An inner cylinder provided with a blood supply lumen and a blood removal lumen that penetrates the blood supply port and the blood removal port of the section, and a cylindrical body in which the inner cylinder is inserted in a liquid-tight manner; An outer cylinder that is shorter than the inner cylinder, wherein a means for opening and closing the blood supply port and the blood removal port is provided on the side wall of the distal end portion. A hemodialysis catheter that enables blood feeding and blood removal when a blood feeding port and a blood removing port of a cylinder are opened to the outside. 2. The hemodialysis catheter according to claim 1, wherein the opening / closing means is two holes provided at a distal end portion of the outer cylinder so as to correspond to a blood supply port and a blood removal port, respectively. 3. By moving the inner cylinder to the distal end side,
3. The hemodialysis catheter according to claim 2, wherein the two holes overlap a blood feeding port and a blood removing port respectively corresponding to the two holes. 4. The catheter for hemodialysis according to claim 2, wherein the inner tube is rotated about an axis so that the two holes overlap the corresponding blood supply port and blood removal port. 5. The hemodialysis catheter according to claim 3, wherein a groove is formed in a distal end portion of the outer cylinder from the hole to the distal end. 6. The hemodialysis catheter according to claim 1, wherein the opening / closing means is a slit provided at a distal end portion of the outer cylinder so as to correspond to a blood supply port and a blood removal port, respectively. 7. By moving the inner cylinder toward the distal end,
7. The hemodialysis catheter according to claim 6, wherein a blood feeding port and a blood removing port corresponding to each of the two slits are opened. 8. The hemodialysis apparatus according to claim 6, wherein the inner tube is rotated about an axis so that a blood inlet and a blood outlet corresponding to each of the two slits are opened. Catheter. 9. The hemodialysis catheter according to claim 2, wherein an opening confirmation mark is provided on each of the proximal ends of the inner cylinder and the outer cylinder so that the opening of the blood supply port and the blood removal port can be confirmed.