CN111840748A - Peripherally passed central venous catheter and preparation method thereof - Google Patents

Abstract

The invention provides a peripheral central venous catheter. The side wall near the head end of the catheter is provided with an input opening and a withdrawal opening; during positive pressure infusion, the input opening is opened and the withdrawal opening is closed; When pressing and withdrawing, the withdrawing opening is opened and the input opening is closed; when balancing, both the input opening and the withdrawing opening are in a closed state. In the peripheral central venous catheter of the present invention, the input opening and the withdrawal opening are respectively unidirectional openings, which increases the safety and effectiveness of use, and avoids poor withdrawal and poor valve closure during long-term use.

Description

A kind of peripheral central venous catheter and preparation method thereof

technical field

The invention belongs to the field of medical devices, in particular to a peripheral central venous catheter and a preparation method thereof.

Background technique

Peripheral central venous catheter (PICC) uses a catheter to puncture a vein in the peripheral arm. The catheter goes directly to the large vein close to the heart, avoiding direct contact between chemotherapy drugs and the vein in the arm. In addition, the blood flow of the large vein is very fast. The rapid dilution of chemotherapy drugs to prevent the stimulation of drugs to blood vessels has gradually been widely used in postoperative clinics in recent years.

At present, through the peripheral central venous catheter, for infusion and withdrawal, the commonly used method is to adopt the three-way valve method. When the negative pressure is used, the valve opens inwards, and blood can be drawn. When the positive pressure is used, the valve opens outwards for infusion. The valve is closed, avoiding the risk of air embolism, blood reflux or coagulation. US Patent US4671769 discloses a venous catheter, the catheter wall is cut along the central axis, the two sides of the catheter slit are completely symmetrical, the slit acts as a valve, when blood is drawn, the catheter lumen forms a negative pressure, and the catheter slit Both sides are concave at the same time. During infusion, the lumen of the catheter forms a positive pressure, and the incision protrudes outward. When it is balanced, it is in a natural closed state.

The method uses the same opening for infusion and withdrawal through the peripheral central venous catheter. Repeated action in different directions for a long time can easily cause aging, resulting in poor withdrawal or lax closure, causing problems such as bleeding.

SUMMARY OF THE INVENTION

In order to overcome the same opening used for infusion and withdrawal through the peripheral central venous catheter mentioned in the background art, repeated actions in different directions for a long time can easily cause aging, resulting in poor withdrawal or lax closure, resulting in problems such as bleeding and other problems. , the present invention provides a peripheral central venous catheter and a preparation method thereof according to the following scheme:

A peripheral central venous catheter, the side wall near the head end of the catheter is provided with an input opening and a withdrawal opening; during positive pressure infusion, the input opening is opened, and the withdrawal opening is closed; negative pressure withdrawal At the time of balance, both the input opening and the withdrawing opening are in the closed state.

Optionally, the opening direction line and the tube axis form an angle of less than 90 degrees, the two sides of the opening are respectively an elastic end and a fixed end, the elastic end is easier to elastically deform than the fixed end, and along the inner direction of the tube, the The elastic end of the input opening covers the fixed end, and the fixed end of the retraction opening covers the elastic end.

Optionally, the angle is 45-75 degrees.

Optionally, the Shore hardness of the elastic end material is 30-60 degrees, and the Shore hardness of the fixed end is more than 1.5 times the Shore hardness of the elastic end.

Optionally, the thickness of the conduit is 0.2-0.4 mm, and the outer diameter of the tube is 0.6-1.5 mm.

Optionally, the opening is along the circumferential direction of the pipe.

Optionally, the length of the opening in the circumferential direction is 1/4 to 1/3 of the circumferential length.

Optionally, the distance between the opening and the pipe head end is 4-6 mm.

Optionally, the catheter material is medical polyurethane or silicone rubber.

The above-mentioned preparation method of the peripheral central venous catheter, comprising the following steps: by the mode of alternate feeding extrusion, in the peripheral central venous catheter mold, the tube body through the peripheral central venous catheter is formed, and the tube body is formed in the peripheral central venous catheter mold. A hard segment, a soft segment and a hard segment are formed in sequence near the head end of the tube, and the input opening and the withdrawal opening are formed by incisions at the connection of the hard segment and the soft segment.

Compared with the prior art, the solution of the present invention has the following advantages: the input opening and the retraction opening are respectively unidirectional openings, which increases the safety and effectiveness of use, and avoids poor retraction and poor valve closure during long-term use. .

Description of drawings

1 is a schematic diagram of an existing peripheral central venous catheter;

2 is a schematic diagram of a peripheral central venous catheter according to a specific embodiment of the present invention;

3 is a schematic diagram of a peripheral central venous catheter according to another specific embodiment of the present invention;

Detailed ways

In order to make the features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1, a schematic diagram of an existing peripheral central venous catheter, the existing peripheral central venous catheter includes a catheter tube body 11, and the side wall of the tube body 11 near the head end of the tube has an opening 12 along the central axis. The central venous catheter is infused and withdrawn through the opening 12, so the repeated action of the same opening in different directions for a long time may easily cause aging, resulting in poor withdrawal or lax closure, resulting in problems such as bleeding.

In order to solve the above problems, a specific embodiment of the present invention provides a peripheral central venous catheter, as shown in FIG. 2 , the peripheral central venous catheter includes a tube body 21, and the side wall of the catheter tube body 21 near the head end of the tube. An input opening 22 and a withdrawal opening 23 are provided; during positive pressure infusion, the input opening 22 is opened, and the withdrawal opening 23 is closed; when negative pressure is withdrawn, the withdrawal opening 23 is opened, and the input opening 22 Closed; when balanced, both the input opening 22 and the withdrawal opening 23 are in a closed state.

Through the peripheral central venous catheter according to the specific embodiment of the present invention, when the negative pressure in the catheter is lower than -7 mmHg, the withdrawal opening 23 is opened inward, the input opening 22 is closed, and blood samples can be drawn; the pressure in the catheter is greater than 80 mmHg, and the input opening is at this time. 22 is opened, the input opening is open to the outside, and the withdrawal opening 23 is closed, allowing the medicinal liquid to enter the human body; when the pressure range is between -7mm to 80mm, that is, when the catheter is not used, the withdrawal opening 23 and the input opening 22 are closed. , to prevent blood reflux, and to prevent blood clotting from clogging the catheter during clinical use.

The peripheral central venous catheter according to the specific embodiment of the present invention, further, as shown in FIG. 3 , the peripheral central venous catheter includes a tube body 31 , and an input opening 32 is provided on the side wall of the catheter tube body 31 near the head end of the tube. and the retraction opening 33; the opening direction lines 39, 40, that is, the opening direction line 39 of the input opening 32 and the opening direction line 40 of the retraction opening 33 and the tube axis 38 form an angle of less than 90 degrees, and the two sides of the opening are They are elastic ends 34, 36 and fixed ends 35, 37 respectively. The elastic ends 34, 36 are more prone to elastic deformation than the fixed ends 35, 37. Along the inner direction of the pipe, the elastic ends of the input openings cover the fixed ends, so The fixed ends 35 , 37 of the retraction openings cover the elastic ends 34 , 36 . Through the above design, when positive pressure infusion, it can be ensured that the input opening 32 is opened, and the withdrawal opening 33 is closed; when the negative pressure is withdrawn, the withdrawal opening 33 is opened, and the input opening 32 is closed; balance; , both the input opening 32 and the withdrawal opening 33 are in a closed state.

In the peripheral central venous catheter according to the specific embodiment of the present invention, as shown in FIG. 3 , the input opening 32 and the withdrawal opening 33 are along the circumferential direction of the tube, which can facilitate the unidirectional control of the opening of the input opening 32 and the withdrawal opening 33. In preparation, the circumferential direction of the pipe is not strictly along the circumferential direction, and a certain deviation is allowed. Usually, the deviation should not exceed 30 degrees, preferably not more than 10 degrees. The input opening 32 and the withdrawal opening 33 may be on the same circumference or not on the same circumference, usually not on the same circumference, so as to prevent if the input opening 32 and the withdrawal opening 33 are on the same circumference, It is easy to cause the concentration of openings to cause the catheter to be more easily damaged. The input opening 32 and the withdrawal opening 33 can be on the same side or on different sides, which can be set according to specific actual needs. Generally, the distance between the openings 32 and 33 and the pipe head end is 4-6 mm.

In the peripheral central venous catheter according to the specific embodiment of the present invention, as shown in FIG. 3 , the opening direction lines 39 and 40 refer to the lines in which the incision directions of the openings 32 and 33 are formed, and the opening direction line of the input opening 32 The angle formed by 39 and the tube axis 38 and the angle formed by the opening direction line 40 of the retraction opening 33 and the tube axis 38 may be the same or different. In order to better ensure the one-way opening and closing function of the input opening 32 and the withdrawal opening 33, the opening direction lines 39, 40 and the pipe axis 38 form an angle of 45-75 degrees.

In the peripheral central venous catheter according to the specific embodiment of the present invention, the length of the opening in the circumferential direction is 1/4 to 1/3 of the circumference of the circumference, and the circumference refers to the outer circumference of the catheter, which is too long or too long. A short one is not conducive to the control of one-way opening and closing of the input opening 32 and the withdrawal opening 33, and too long is easy to damage the catheter.

In the peripheral central venous catheter according to the specific embodiment of the present invention, as shown in FIG. 3 , the elastic ends 34 and 36 are made of elastic material, and the Shore hardness of the material is 30-60 degrees. On the one hand, it is used as a peripheral central venous catheter On the other hand, in order to prevent bleeding when the openings 32, 33 are closed, the fixed ends 35, 37 are also made of elastic material, but the Shore hardness of the material of the fixed ends 35, 37 is the material of the elastic ends 34, 36 It is more than 1.5 times, preferably 2-4 times, of the Shore hardness of the water. During infusion or withdrawal, the opening and changing of the openings 32 and 33 can be controlled by the elastic deformation of the elastic ends 34 and 36 .

In the peripheral central venous catheter according to a specific embodiment of the present invention, the elastic material is usually a medical polymer elastic material, specifically, preferably polyurethane or silicone rubber.

According to the peripheral central venous catheter according to the specific embodiment of the present invention, the thickness of the catheter is 0.2-0.4 mm, and the outer diameter of the tube is 0.6-1.5 mm.

In the peripheral central venous catheter according to the specific embodiment of the present invention, there may be one or more input openings 32 and withdrawal openings 33 respectively, and multiple settings may be performed as required, usually one each.

The present invention also provides a specific embodiment of the above-mentioned preparation method of the peripheral central venous catheter. Continuing to refer to FIG. 3 , the preparation method includes the following steps: by alternately feeding and extruding, in the peripheral central venous catheter A tube body 31 passing through the peripheral central venous catheter is formed in the mold, and a hard segment 41, a soft segment 42 and a hard segment 43 are formed in sequence at the proximal end of the tube body 31, and at the junction of the hard segments 41, 43 and the soft segment 42 The incisions are made along the opening direction lines 39 and 40 to form fixed ends 35 and 37 on the hard segments 41 and 43 and elastic ends 34 and 36 on the soft segments 42 to form the input opening 32 and the withdrawal opening 33 .

In the preparation method of the peripheral central venous catheter according to the specific embodiment of the present invention, the incision operation is performed through a special tooling. A computer-controlled tool makes the incision.

According to the preparation method of the peripheral central venous catheter according to the specific embodiment of the present invention, the elastic end of the input opening and the elastic end of the withdrawal opening can be formed on the same soft segment, or can be formed on different soft segments.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (10)

1. through a peripheral central venous catheter, it is characterized in that, the near-pipe head end side wall of the catheter is provided with an input opening and a withdrawal opening; During positive pressure infusion, the input opening is opened, and the withdrawal opening is closed; when the negative pressure is retracted, the retraction opening is opened and the input opening is closed; when balanced, both the input opening and the retraction opening are in a closed state. 2. The peripheral central venous catheter according to claim 1, wherein the opening direction line and the tube axis form an angle of less than 90 degrees, the two sides of the opening are respectively an elastic end and a fixed end, and the elastic end is larger than the tube axis. The fixed end is prone to elastic deformation, and along the inner direction of the pipe, the elastic end of the input opening covers the fixed end, and the fixed end of the withdrawal opening covers the elastic end. 3 . The peripheral central venous catheter according to claim 2 , wherein the angle is 45-75 degrees. 4 . 4 . The peripheral central venous catheter according to claim 2 , wherein the Shore hardness of the elastic end material is 30 to 60 degrees, and the Shore hardness of the fixed end is 1.5 times that of the elastic end. 5 . above. 5 . The peripheral central venous catheter according to claim 1 , wherein the thickness of the catheter is 0.2-0.4 mm, and the outer diameter of the catheter is 0.6-1.5 mm. 6 . 6 . The peripheral central venous catheter according to claim 2 , wherein the opening is along the circumferential direction of the tube. 7 . 7 . The transperipheral central venous catheter according to claim 6 , wherein the length of the opening along the circumferential direction is 1/4˜1/3 of the circumferential length. 8 . 8 . The peripheral central venous catheter according to claim 1 , wherein the distance between the opening and the head end of the tube is 4-6 mm. 9 . 9 . The peripheral central venous catheter according to claim 1 , wherein the catheter material is medical polyurethane or silicone rubber. 10 . 10. The method for preparing a peripheral central venous catheter according to any one of claims 1-9, characterized in that, comprising the steps of: forming a peripheral central venous catheter in a peripheral central venous catheter mold by means of alternate feeding extrusion. For the tube body of the peripheral central venous catheter, a hard segment, a soft segment and a hard segment are sequentially formed at the proximal head end of the tube body, and the input opening and the withdrawal opening are formed by incisions at the junction of the hard segment and the soft segment.

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