CN203507279U - Single-cavity central venous catheter - Google Patents

Abstract

The utility model discloses a single-lumen central venous catheter, which solves the problems of low puncture rate and easy occurrence of catheter bending in the body when the existing single-lumen central venous catheter is used for intracorporeal angiostomy through surgery, resulting in vascular fistula. clogging problem. The technical solution includes a catheter, the front section of the catheter is covered with a front hard sleeve, and the rear section is covered with a rear hard sleeve. The utility model has the advantages of simple structure, convenient operation, high puncture success rate, and long-term unobstructed catheter.

Description

single lumen central venous catheter

technical field

The utility model relates to a medical device, in particular to a single-cavity central venous catheter for angiostomy in human or animal body.

Background technique

A central venous catheter is an endovascular tube that can be placed in arteries and veins for internal vascular access. In order to reduce damage to the intima of blood vessels, most of the current medical central venous catheters use polyurethane materials that can soften under body temperature conditions. These catheters are widely used and are mainly used for vascular intervention procedures such as measuring central venous pressure, collecting blood samples, and injecting drugs or solutions that have a short residence time in the blood vessel. There are various types of single-lumen central venous catheters currently on the market, most of which can meet the needs of medical treatment and research.

When the single-lumen central venous catheter is used for angiostomy in humans or animals (such as hepatic vein, hepatic vein or mesenteric vein), due to the long puncture journey of the catheter in the body and the need to keep the fistula in the body for a long time, and Keep it flowing. At present, the catheter made of polyurethane material used in single-lumen central venous catheters becomes soft under body temperature conditions after being penetrated into blood vessels, which may easily cause sharp-angle bends at the position where the catheter is fixed in the body or passes through the skin, causing the catheter to be blocked, resulting in blood flow. Withdrawal, the vascular fistula fails.

Contents of the invention

The purpose of the utility model is to solve the above-mentioned technical problems, and provide a single-lumen central venous catheter with simple structure, easy operation, improved puncture success rate, and long-term stagnation of the catheter.

The technical solution includes a catheter, the front section of the catheter is covered with a front hard sleeve, and the rear section is covered with a rear hard sleeve.

The position of the front hard sleeve on the catheter corresponds to: after the puncture is completed, the front hard sleeve is just at the position close to the outer wall of the blood vessel at the puncture site in the body; the position of the rear hard sleeve on the catheter corresponds to : After the puncture is completed, the rear hard sleeve is just at the puncture site of the body surface.

The length of the front hard casing is 25-35mm, and the length of the rear hard casing is 45-50mm.

The wall thickness of the front rigid casing and the rear rigid casing is 0.8-1.2mm.

The inventor analyzed and studied the reasons for the puncture failure, and found that this type of catheter is prone to acute-angle bending at two places after the puncture operation. One is the position where the puncture site is close to the outer wall of the blood vessel in the body, and the other is that Superficial skin puncture site. That is to say, improving the strength of the conduit at the above two places just can solve the above problems. The utility model is simply improved on the basis of the existing universal single-lumen central venous catheter, that is, two sections of hard sleeves are added to the existing catheter, so as to solve the above-mentioned technical problems, and the hard sleeves can be Using PVC or silicone material, the hard casing can be bonded to the catheter by pasting. The method of partially fitting the hard sleeve will not greatly increase the hardness of the entire catheter, which will affect the normal puncture, and at the same time meet the requirements of increasing the strength of the catheter bend, facilitate the fixation and knotting of the catheter in the body, and ensure the safety of the catheter. unobstructed. The utility model has the advantages of simple structure, convenient operation, greatly improved puncture success rate, long-term unobstructed catheter, and is especially suitable for angiostomy in human or animal body.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a state diagram of the utility model after puncturing.

Among them, 1-catheter, 2-anterior hard cannula, 3-posterior hard cannula, 4-vessel, 5-skin opening.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further explained:

Referring to Fig. 1, the novel single-lumen central venous catheter comprises a catheter 1, the front section of the catheter 1 is covered with a front rigid sleeve 2, and the rear section is covered with a rear rigid sleeve 2, and the catheter and the front and rear rigid sleeves The sleeves 2 and 3 are bonded with medical adhesive. The length of the front rigid sleeve 2 is 25-35mm, and the length of the rear rigid sleeve 3 is 45-50mm; the wall thickness of the front rigid sleeve 2 and the rear rigid sleeve 3 is 0.8-1.2mm.

Operation process:

The puncture method of the single-lumen central venous catheter is the same as the existing puncture method. Taking the portal vein puncture as an example, the specific steps are as follows: first, make an incision on the abdominal wall, and then insert the puncture needle into the body (human or animal body) through the skin opening 5 and then insert it into the portal vein , after confirming that the puncture needle is in the blood vessel 4 of the vein, push the guide wire inserted into the puncture needle into the blood vessel 4 of the portal vein from the outer end of the puncture needle, withdraw the puncture needle while keeping the guide wire in the blood vessel 4, and then insert a set of catheter At the other end of the guide wire outside the skin, push the front end of the catheter 1 into the blood vessel 4 of the portal vein along the guide wire. 4. The position of the outer wall; the rear hard sleeve 3 is located at the 5 places where the skin is opened on the body surface (see Figure 2 for the specific state); finally, the first fixed knot is tied on the front hard sleeve 2 to fix the catheter 1 in the body Then close the wound, the second fixed knot is tied on the rear hard casing 3, and the catheter 1 is fixed in vitro, and the specific knotting method is the same as that of the prior art.

Claims (4)

1. A single-lumen central venous catheter, comprising a catheter, characterized in that, the front section of the catheter is covered with a front rigid sleeve, and the rear section is covered with a rear rigid sleeve. 2. The single-lumen central venous catheter according to claim 1, wherein the position of the front hard sleeve on the catheter corresponds to: after the puncture is completed, the front hard sleeve is just located close to the puncture site in the body The position of the outer wall of the blood vessel; the position of the rear rigid sleeve on the catheter corresponds to: after the puncture is completed, the rear rigid sleeve is just located at the puncture site of the body surface. 3. The single-lumen central venous catheter according to claim 1 or 2, wherein the length of the front rigid sleeve is 25-35 mm, and the length of the rear rigid sleeve is 45-50 mm. 4. The single-lumen central venous catheter according to claim 1 or 2, characterized in that, the wall thickness of the front rigid sleeve and the rear rigid sleeve is 0.8-1.2 mm.

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