JPH11239614A - Double lumen catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double lumen catheter capable of being connected to a blood circuit by a simple operation, causing no liquid leaking or no air infiltrating in connecting with the blood circuit and advantageous in a cost. SOLUTION: A double lumen catheter is composed of a catheter main body 1 having a blood supply lumen 11 and a blood returning lumen 12 and the connector part 2 to allow this catheter main body 1 to communicate with a blood circuit. This connector part 2 has a first chamber 21 which has the base end closed by a first rubber plug 22 having a slit and communicates with the blood supply lumen 11 on the tip and a second chamber 24 which is formed inside this first chamber 21, has the base end closed by a second rubber plug 25 having a slit and communicates with the blood returning lumen 12 on the tip so that the slit 23 of the first rubber plug 22 and the slit 26 of the second rubber plug 25 are coaxially formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a double lumen catheter used by inserting it into a blood vessel. More particularly, the present invention relates to a double lumen catheter that can be easily interconnected with a blood circuit without the use of connectors or sharp cannulas. The double lumen catheter of the present invention is particularly suitable for hemodialysis treatment.

[0002]

2. Description of the Related Art In dialysis treatment, double-lumen catheters have been conventionally used frequently, and the jugular vein, subclavian vein,
It is inserted into the femoral vein for treatment. Double-lumen catheters have a blood donation lumen to draw blood from the vein and supply it to the dialyzer, and a blood return lumen to return blood after treatment to the vein, which is usually fixed at that position in the patient for about two weeks Is done. It is usually removed when treatment is no longer needed, or when an infection occurs at the insertion site, or when the catheter malfunctions, and replaced with a new double lumen catheter.

[0003] In general, the connection between the double-lumen catheter and the blood circuit is made via connectors of connection tubes provided at the proximal ends of the blood donating lumen and the blood return lumen of the catheter, respectively. However, connection using such a connector is difficult to assemble due to, for example, a large number of components and a relatively complicated shape, which is disadvantageous in cost and is easy to use. In addition, since the female connector is opened before the male connector is fully seated at the time of connection, undesired situations such as leakage of liquid or intrusion of air during interconnection may occur. There are disadvantages such as.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can be connected to a blood circuit by a simple operation, and at the time of connection with the blood circuit, leakage of liquid occurs or air intrusion occurs. It is an object of the present invention to provide a cost-effective double-lumen catheter that does not occur.

[0005]

The present inventor has made intensive studies to solve the above-mentioned problems, and as a result, the double-lumen catheter was closed at the proximal end thereof with two rubber stoppers with slits formed coaxially. If a connector section having two chambers is provided so that each of the two chambers communicates only with one of the lumens of the catheter, the two slits of the connector section of the catheter are formed using a dedicated tubular member having two lumens. The present invention has been completed by conceiving that the two lumens of the tubular member can be communicated with only one of the chambers of the connector portion when the piercing is performed. That is, the present invention comprises a catheter body having a blood donation lumen and a blood return lumen, and a connector portion for communicating the catheter body with a blood circuit,
The connector portion is formed inside a first chamber closed at a base end thereof with a first rubber stopper having a slit for inserting a tubular communication member and communicating with the blood donation lumen at a distal end. A proximal end closed by a second rubber stopper with a slit for inserting a tubular communication member, and having a second chamber communicating with the blood return lumen at the distal end, and a slit of the second rubber stopper; The present invention relates to a double-lumen catheter in which the slit of the first rubber stopper is formed coaxially (first invention). Here, it is preferable to provide a connecting means for fixing the tubular communication member at the base end of the first chamber so that the communication member does not come off during use.

[0006] The present invention also provides a double lumen catheter according to the first invention, a first passage opening at the distal end,
It has a second passage opening to the side wall at a predetermined distance from the tip, and when the tubular communication member penetrates the slit of the first rubber stopper and the slit of the second rubber stopper of the double lumen catheter, A second aspect of the present invention relates to a catheter assembly including a tubular communication member formed such that a first passage communicates with a second chamber and a second passage communicates with the first chamber. Here, interconnecting means may be provided at the proximal end of the double lumen catheter and the proximal end of the tubular communication member, and the distal end of the opening of the second passage of the tubular communication member may be provided with the first chamber. A step may be provided which easily and releasably engages with the rubber stopper.

[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 longitudinal sectional view showing an embodiment of the double lumen catheter of the first invention, and FIG.
FIG. 3 is a longitudinal sectional view showing the catheter assembly of the second invention (showing a state where the tubular connecting member is inserted), and FIG. 3 is a view showing a state where the tubular connecting member is retracted to the heparin injection position in FIG. FIG. 4 is a longitudinal sectional view of the tubular connecting member shown in FIG. The double-lumen catheter shown in FIG. 1 includes a catheter body 1 having a blood donation lumen 11 and a blood return lumen 12, and a connector section 2 for connecting the catheter body 1 to a blood circuit (not shown). The connector portion 2 is closed at the base end by a first rubber stopper 22 having a slit, and the blood donation lumen 1 is provided at the front end.
And a second rubber stopper 25 formed in the first chamber 21 and having a base end provided with a slit.
And a second chamber 24 that communicates with the blood return lumen 12 at the distal end. The slit 23 of the first rubber plug 22 and the slit 26 of the second rubber plug 25 are formed coaxially. Become.

The catheter body 1 is usually a flexible tube made of plastic such as polyurethane, polyethylene, silicone rubber, polytetrafluoroethylene, etc., and takes blood from a vein and supplies it to a dialyzer (not shown). And a blood return lumen 12 for returning blood after treatment to a vein with a dialyzer. On the other hand, the connector section 2 has a first chamber 21 communicating with the blood donation lumen 11 and a second chamber 21 communicating with the blood return lumen 12.
The first ends of the first chamber 21 and the second chamber 24 have slits 23 and 26 for inserting the tubular communication member 3 as shown in FIG. 2 respectively. And the second rubber stopper 25 are fluid-tightly closed. Preferably, a coupling means 27 such as a male screw is provided at the base end of the connector 2 so that the tubular communication member 3 inserted into the rubber plugs 22 and 25 does not come off during use. The base end of the connector section 2 may be closed with a cap (not shown) impregnated with isodine or the like during non-dialysis. Generally, a flexible resin such as polyethylene, polypropylene, polyester, or ABS resin is suitably used as a material for forming the portion of the connector portion 2 other than the rubber stoppers 22 and 25.
As a material for forming the rubber stoppers 22 and 25, synthetic rubber such as isoprene rubber and silicone rubber, natural rubber, and polyolefin-based elastomer are generally suitably used.

The catheter assembly shown in FIG. 2 is a combination of the double lumen catheter DC shown in FIG. 1 and a dedicated tubular communication member 3. After the extracorporeal circulation is completed, the tubular communication member 3 is connected as shown in FIG. The second rubber stopper 25 is retracted.
When the insertion into the slit 26 is released, heparin can be injected into the first chamber to prevent coagulation of blood staying inside the catheter.

As shown in FIG. 4, the tubular communication member 3 has a first passage 31 opening at the tip and a second passage 32 opening at a side wall at a predetermined distance from the tip. The opening position of the second passage is determined by inserting the first passage 31 into the second chamber 24 by inserting the slits 23 and 26 of the first and second rubber plugs 22 and 25 of the double lumen catheter DC with the tubular communication member 3. When the second passage 32 communicates with the first chamber 21, the second passage 32 is determined to communicate with the first chamber 21. Here, it is preferable to provide, at the distal end of the tubular communication member 3, a coupling means 35 such as a female screw, for example, which is mutually coupled with the coupling means 27 at the proximal end of the double lumen catheter DC. The tubular communication member 3 may be provided with a connector (not shown) at the base end thereof so as to be connected to the blood circuit. Alternatively, the tubular communication member 3 may be integrally attached to the blood circuit. .

A step 33 which can be easily and releasably engaged with the first rubber plug 22 can be provided on the distal end side of the opening 321 of the second passage 32 if necessary. This step 33
Connects the tubular communication member 3 to the slit 26 of the second rubber stopper 25.
The first passage 31 of the tubular communication member 3 is engaged with the first rubber stopper 21 when the double-lumen catheter D
The second passage 32 is closed by the first rubber plug 22 by appropriately determining the position of the step portion 33 at this time. be able to. Then, the first passage 31 of the tubular communication member 3 is connected to the first chamber 21 of the double lumen catheter DC.
In a state in which heparin is communicated, heparin can be injected into the first chamber 21 and the blood donation lumen 11 through the first passage 31. Numeral 34 denotes an annular projection for determining the position of the tubular communication member 3 entering the double lumen catheter DC. The inner wall of the top surface 351 of the connecting means 35 of the tubular communication member 3 is brought into contact with the inner wall of the connecting member 35.
The annular projection 34 may abut the first rubber stopper 21.

Next, the use of the tubular communication member 3 assembly of the present invention will be described with reference to FIGS. However, it is assumed that the first passage 31 and the second passage 32 of the tubular communication member 3 are connected to the downstream side and the upstream side of the blood circuit, respectively. First, the tubular communication member 3 is inserted into the slits 23 and 26 of the first and second rubber stoppers 22 and 25 of the double lumen catheter DC, and the double lumen catheter D is inserted.
The coupling means 27 of C and the coupling means 35 of the tubular communication member 3 are mutually coupled (see FIG. 2). At this time, since the space between the tubular communication member 3 and the slits 23 and 26 of the first and second rubber plugs 22 and 25 is always kept fluid-tight, leakage of the chemical solution and intrusion of air do not occur. . When dialysis treatment is performed in this state, the blood of the patient is sent from the vein to the dialyzer through the blood donating lumen 11, the first chamber 21, the second passage 32, and the blood circuit on the upstream side as shown by the arrow B. Then, the blood is purified and returned to the vein through the blood circuit on the granule side, the first passage 31, the second chamber 24 and the blood return lumen 12 as shown by an arrow A.

When the dialysis is completed, the tubular communication member 3 is
From the rubber stopper 25 to make the state as shown in FIG. At this time, the step 33 of the tubular communication member 3 and the first rubber plug 22 of the connector 2 are in abutment, and the first passage 31
Communicates with the first chamber 21, and the second passage 32 is closed by the first rubber stopper 22. In this state, when heparin is injected from the first passage 31 of the tubular communication member 3 into the first chamber 21, heparin flows as shown by the arrow C, and is filled in the first chamber 21 and the blood donation lumen 11. Blood coagulation can be prevented. When the heparin injection is completed, the tubular communication member 3 is removed from the double lumen catheter DC, and if necessary, the proximal end of the connector portion 2 may be closed with a cap impregnated with isodine or the like.

[0014]

As is apparent from the above description, the double-lumen catheter of the present invention can connect the double-lumen catheter to the blood circuit only by inserting the tubular communication member into the slit of the rubber stopper. Since it is possible, it can be connected to the blood circuit by a simple operation. In addition, it is safe because no blood leak or air mixing occurs. By retracting and using the tubular communication member, heparin can be injected into the blood donation line to prevent coagulation of blood staying inside the catheter. Should the tubular communication member fall out of the double lumen catheter,
Since the first chamber and the second chamber of the catheter are closed by the rubber stopper, blood does not leak and is safe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a double lumen catheter of the first invention.

FIG. 2 is a longitudinal sectional view showing the catheter assembly of the second invention (showing a state where a tubular connecting member is inserted).

FIG. 3 is a view showing a state where the tubular connecting member is retracted to a heparin injection position in FIG. 2;

FIG. 4 is a longitudinal sectional view of the tubular connecting member shown in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 catheter main body 11 blood donation lumen 12 blood return lumen 2 connector part 21 first chamber 22 first rubber plug 23 slit 24 second chamber 25 second rubber plug 26 slit 27 coupling means 3 tubular communication member 31 first Passage 32 Second passage 321 Opening 33 Step 34 Annular convex 35 Coupling means 351 Top surface DC Double lumen catheter

Claims (5)

[Claims] 1. A catheter body having a blood donation lumen and a blood return lumen, and a connector portion for connecting the catheter body to a blood circuit, wherein the connector portion has a proximal end slit for inserting a tubular communication member. A first chamber which is closed with a first rubber stopper attached thereto and communicates with the blood donation lumen at the distal end, and a first chamber formed inside the first chamber and having a proximal end provided with a slit for inserting a tubular communication member. A second chamber which is closed by a second rubber stopper and communicates with the blood return lumen at the distal end, wherein the slit of the second rubber stopper and the slit of the first rubber stopper are formed coaxially. Double lumen catheter. 2. The double-lumen catheter according to claim 1, wherein a coupling means for fixing the tubular communication member is provided at a proximal end of the first chamber. 3. A tubular communication device comprising: the double lumen catheter according to claim 1, a first passage opening at a distal end, and a second passage opening at a side wall located at a predetermined distance from the distal end. When the member penetrates the slit of the first rubber stopper and the slit of the second rubber stopper of the double lumen catheter, the first passage communicates with the second chamber and the second passage communicates with the first chamber. A catheter assembly comprising: a tubular communication member formed to perform 4. The catheter assembly according to claim 3, wherein the proximal end of the double lumen catheter and the proximal end of the tubular communication member are provided with an interconnecting means. 5. The tubular communication member according to claim 3, wherein a step portion is provided at the distal end side of the opening of the second passage so as to easily and releasably engage with the rubber stopper of the first chamber. Catheter assembly.