A silicone central venous catheter

Abstract

The present invention provides a silicone central venous catheter, belonging to the technical field of medical devices, comprising a silicone tube body; an extension tube body, the extension tube body being a thermoplastic plastic extension tube; and a connector, used for connecting and fixing the silicone tube body and the extension tube body, wherein a connecting cavity is arranged inside the connector, one end of the connector is for the silicone tube body to pass through and be fixed and connected with each other, and the other end of the connector is fixedly connected with the extension tube body, so that the probability of bubbles generated in the extension tube body can be significantly reduced, especially when a polyurethane extension tube is used, basically no bubbles are generated, thereby reducing the panic and anxiety of patients and alleviating the workload of nurses.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a silicone central venous catheter. Background Art

[0002] Central venous catheter (PICC catheter) is a catheter placed into the central vein through the peripheral vein route, used to provide patients with medium- to long-term intravenous treatment, which can greatly reduce the pain caused by frequent venous puncture to patients, avoid the impact and damage of irritating drugs on the vein, have a long retention time, and a low incidence of complications. Existing PICC catheters can be divided into two categories, one is a silicone central venous catheter (silicone PICC catheter) made of silicone material by heating and curing process; the other is a polyurethane central venous catheter (polyurethane PICC catheter) made of polyurethane material by hot melting and cooling, also known as high-pressure injection PICC catheter. The performance of silicone PICC catheter and polyurethane PICC catheter is significantly different. When using, doctors will choose the appropriate PICC catheter according to the content of the treatment. The two cannot replace each other (see the document "Clinical Application of High-Pressure Injection PICC and Silicone PICC Catheter", Feng Yulin, World Latest Medical Information Digest 2013 Vol. 13 No. 20, 467-472).

[0003] Among them, silicone PICC catheters have the advantages of less damage to blood vessels, good biocompatibility, no change in physical and chemical properties after long-term indwelling, high safety, and good comfort, and are widely used in clinical practice. However, the applicant found in clinical practice that silicone PICC catheters are very easy to produce bubbles during use, which makes patients panic and uneasy, and easily induces or aggravates air embolism. Nurses need to regularly extract the air in the silicone PICC catheter, which not only increases the workload of nurses, but also requires considerable skill and quick response, and the operation is difficult, time-consuming and laborious. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the silicone central venous tube in the prior art that bubbles are easily generated, thereby providing a silicone central venous catheter.

[0005] The present invention provides a silicone central venous catheter, comprising:

[0006] Silicone tube body;

[0007] An epitaxial tube body, wherein the epitaxial tube body is a thermoplastic plastic epitaxial tube;

[0008] A connector is used to connect and fix the silicone tube body and the extension tube body. A connecting cavity is arranged inside the connector. One end of the connector is passed through and fixed by the silicone tube body and is connected with the silicone tube body, and the other end is fixed and connected with the extension tube body.

[0009] Furthermore, the thermoplastic plastic epitaxial tube is any one of a polyethylene epitaxial tube, a polyvinyl chloride epitaxial tube, a polyurethane epitaxial tube and a polyethylene terephthalate epitaxial tube.

[0010] Furthermore, the connector comprises:

[0011] The decompression sleeve has a first cavity provided inside for the silicone tube to pass through;

[0012] The joint seat has a second cavity interconnected with the first cavity. The joint seat is located in the second cavity and has a connecting pipe that extends into the first cavity for the silicone tube body to be sleeved and fixed. The end of the joint seat located on the outside is clamped with the decompression sleeve.

[0013] Further, the first cavity comprises:

[0014] A first cavity, located at one end of the first cavity close to the connector seat, for the connecting pipe to extend into;

[0015] A second cavity is located at an end away from the connector seat and is coaxially arranged with the first cavity;

[0016] The width of the first cavity is greater than the width of the second cavity, the outer diameter of the silicone tube body in a non-deformed state is greater than the width of the second cavity, and the outer diameter of the silicone tube body in a non-deformed state is smaller than the width of the first cavity.

[0017] Furthermore, the difference between the outer diameter of the silicone tube body in a non-deformed state and the width of the second cavity is 0.1 to 2 times the thickness of the silicone tube body.

[0018] Furthermore, the difference between the width of the second cavity and the outer diameter of the connecting tube is 0.1 to 0.5 times the thickness of the silicone tube body in a non-deformed state.

[0019] Furthermore, the connector further comprises:

[0020] A first slope portion is located at an end of the decompression sleeve close to one end of the joint seat, wherein a width of the first slope portion at the end close to the joint seat is smaller than a width of the first slope portion at the end away from the joint seat;

[0021] The second slope portion is located at an end portion of the joint seat close to one end of the decompression sleeve, and the end surface of the second slope portion and the end surface of the first slope portion abut against each other.

[0022] Furthermore, the silicone central venous catheter also includes:

[0023] A clamping groove is disposed around the end of the joint seat away from the decompression sleeve;

[0024] The silicone base has a through hole at its center, and after being embedded in the card slot, the silicone base is used to fix the extension tube which is sleeved on the joint seat and covers the card slot.

[0025] Furthermore, the connector further comprises a groove located on the decompression sleeve and a protrusion located on the connector seat, and the protrusion and the groove cooperate with each other to achieve the clamping connection between the decompression sleeve and the connector seat.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The silicone central venous catheter provided by the present invention comprises a silicone tube body, an extension tube body and a connector, wherein one end of the connector is fixedly provided for the silicone tube body to penetrate and be interconnected, and the other end is fixedly connected to the extension tube body, so that the entire PICC catheter is interconnected and fixed to each other, and can be used for intravenous drug delivery, wherein the silicone tube body is adopted to enable the PICC catheter to maintain good tissue compatibility and compliance, and the use of a thermoplastic plastic extension tube, such as a polyethylene extension tube, a polyvinyl chloride extension tube, a polyurethane extension tube or a polyethylene terephthalate extension tube, can significantly reduce the probability of bubbles generated in the silicone PICC catheter compared to the silicone extension tube, especially the use of a polyurethane extension tube, which basically does not generate bubbles, thereby reducing the panic and anxiety of patients and reducing the workload of nurses.

[0028] 2. The silicone central venous catheter provided by the present invention, the connector includes a decompression sleeve and a joint seat, the interior of the decompression sleeve is provided with a first cavity for the silicone tube body to pass through, the interior of the joint seat is provided with a second cavity interconnected with the first cavity, the joint seat is located in the second cavity and is provided with a connecting tube extending into the first cavity for the silicone tube body to be sleeved and fixed, the end of the joint seat located on the outside is mutually clamped with the decompression sleeve, for the inner side of the silicone PICC catheter, the elasticity of the silicone tube body can be used to sleeve and fix it on the connecting tube, so that the silicone tube body is interconnected with the second cavity through the connecting tube, and the outside is mutually clamped with the decompression sleeve through the joint seat, so that the two are connected.

[0029] 3. The silicone central venous catheter provided by the present invention, the first cavity includes a first cavity and a second cavity, the first cavity is located at one end of the first cavity close to the connector seat, the second cavity is located at the end away from the connector seat and is coaxially arranged with the first cavity, the width of the first cavity is greater than the width of the second cavity, the outer diameter of the silicone tube body is greater than the width of the second cavity and smaller than the width of the first cavity, so that the silicone tube body can be easily extended into the decompression sleeve from one end of the first cavity with a larger width, and can also use its own elastic force to squeeze into the second cavity with a smaller width and be fixed in the second cavity, so that the silicone tube body is not easy to fall off, and the installation operation is convenient and fast.

[0030] 4. In the silicone central venous catheter provided by the present invention, the difference between the outer diameter of the silicone tube body in the non-deformed state and the width of the second cavity is 0.1 to 2 times the thickness of the silicone tube body, so that the silicone tube body can not only penetrate into the second cavity by utilizing its own elastic force, but also fit tightly with the inner wall of the decompression sleeve under the action of rebound, effectively improving the situation in which air enters the silicone tube body from the second cavity and causes bubbles in the entire PICC catheter.

[0031] 5. In the silicone central venous catheter provided by the present invention, the difference between the width of the second lumen and the outer diameter of the connecting tube is 0.1 to 0.5 times the thickness of the silicone tube body in a non-deformed state, so that the silicone tube body can be tightly sleeved on the connecting tube, and use its own elastic force to squeeze into the gap between the connecting tube and the decompression sleeve in the second lumen under a compressed state, and then fit tightly with the inner wall of the decompression sleeve under the action of rebound, effectively improving the situation in which air is introduced from the silicone tube body in the first lumen and bubbles appear in the entire PICC catheter.

[0032] 6. The silicone central venous catheter provided by the present invention, the connector also includes a first slope located at the end of the decompression sleeve close to one end of the connector seat and a second slope located at the end of the connector seat close to one end of the decompression sleeve, the width of the first slope located at the end close to the connector seat is smaller than the width of the first slope located at the end away from the connector seat, the end faces of the second slope and the first slope abut against each other, which can improve the tightness of the connection between the connector seat and the decompression sleeve, reduce the occurrence of air entering through the gap between the connector seat and the decompression sleeve, and is easy to align and convenient to install.

[0033] 7. The silicone central venous catheter provided by the present invention includes a silicone base and a slot. The slot is arranged around the end of the connector seat that is away from the decompression sleeve. When in use, the extension tube is first sleeved on the connector seat and covered on the slot of the connector seat, and then the silicone base is embedded in the slot. This can not only further fix the extension tube and the connector seat, but also make it convenient for patients to use and more comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a schematic diagram of the structure of the silicone tube body and the connector provided in Example 1 of the present invention;

[0036] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0037] Figure 3 This is a schematic structural diagram of the connector and the extension tube body provided in Example 1 of the present invention;

[0038] Figure 4 for Figure 3 Enlarged view of middle part B;

[0039] Description of reference numerals:

[0040] 1. Silicone tube body; 2. Extension tube joint; 21. Extension tube body; 3. Connector; 31. Decompression sleeve; 311. First cavity; 311a. First cavity; 311b. Second cavity; 312. First slope; 313. Groove; 32. Joint seat; 321. Second cavity; 322. Connecting tube; 323. Second slope; 324. Slot; 325. Silicone base; 326. Protrusion. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] like Figure 1 and 3 A specific embodiment of the silicone central venous catheter shown includes a silicone tube body 1, an extension tube body 21, and a connector 3 located between the silicone tube body 1 and the extension tube body 21 for connecting and fixing the silicone tube body 1 and the extension tube body 21.

[0047] The epitaxial tube body 21 is a thermoplastic epitaxial tube, and the thermoplastic epitaxial tube is any one of a polyethylene epitaxial tube, a polyvinyl chloride epitaxial tube, a polyurethane epitaxial tube, and a polyethylene terephthalate epitaxial tube. In this embodiment, the epitaxial tube body 21 is a polyurethane epitaxial tube. The silicone tube body 1 is used to enable the PICC catheter to maintain good tissue compatibility and compliance. The thermoplastic epitaxial tube body 21, such as a polyethylene epitaxial tube, a polyvinyl chloride epitaxial tube, a polyurethane epitaxial tube, or a polyethylene terephthalate epitaxial tube, can significantly reduce the number and probability of bubbles generated in the silicone PICC catheter compared to the silicone epitaxial tube. In particular, the polyurethane epitaxial tube is used, and basically no bubbles are generated, thereby greatly reducing the panic and anxiety caused by the patient seeing bubbles appearing in the silicone PICC catheter, reducing the workload of nurses, and easing the doctor-patient relationship.

[0048] The connector 3 is provided with a connecting cavity inside, one end of the connector 3 is fixedly passed through the silicone tube body 1 and connected with each other, and the other end is fixedly connected with the extension tube body 21, so that the entire PICC catheter is connected and fixed with each other and can be used for intravenous drug delivery. Specifically, the connector 3 includes a decompression sleeve 31 and a joint seat 32. The decompression sleeve 31 is provided with a first cavity 311 for the silicone tube body 1 to pass through, and the joint seat 32 is provided with a second cavity 321 that is interconnected with the first cavity 311. The joint seat 32 is provided with a connecting pipe 322 that extends into the first cavity 311 for the silicone tube body 1 to be sleeved and fixed. The inner diameter of the silicone tube body 1 is smaller than the outer diameter of the connecting pipe 322. The first cavity 311 and the second cavity 321 are interconnected through the connecting pipe 322. One end of the joint seat 32 located on the outside is mutually clamped with the decompression sleeve 31. When installed and used, for the inside of the silicone PICC catheter, the silicone tube body 1 can be sleeved and fixed on the outside of the connecting pipe 322 by utilizing its own elasticity, so that the silicone tube body 1 is interconnected with the second cavity 321 through the connecting pipe 322, and for the outside of the silicone PICC catheter, the joint seat 32 and the decompression sleeve 31 are mutually clamped, so that the two are connected. In this embodiment, the connector 3 further includes a groove 313 located on the decompression sleeve 31 and a protrusion 326 located on the connector seat 32 . The protrusion 326 cooperates with the groove 313 to achieve the clamping connection between the decompression sleeve 31 and the connector seat 32 .

[0049] like Figure 2 As shown, the first cavity 311 includes a first cavity 311a for the connecting tube 322 to extend into and a second cavity 311b connected to the first cavity 311a, the first cavity 311a is located at one end close to the joint seat 32, the second cavity 311b is located at one end away from the joint seat 32, the width of the first cavity 311a is greater than the width of the second cavity 311b, and the outer diameter of the silicone tube body 1 in the non-deformed state is greater than the width of the second cavity 311b and less than the width of the first cavity 311a. By utilizing the relationship between the outer diameter of the silicone tube body 1 and the widths of the first cavity 311a and the second cavity 311b, the silicone tube body 1 can be conveniently extended into the decompression sleeve 31 from one end of the first cavity 311a with a larger width, and can also be squeezed into the second cavity 311b with a smaller width by its own elastic force to be relatively fixed, so that the silicone tube body 1 is not easy to fall off without the action of external force, and the installation operation is convenient and fast.

[0050] The difference between the outer diameter of the silicone tube body 1 in the non-deformed state and the width of the second lumen 311b is 0.1 to 2 times the thickness of the silicone tube body 1, so that the silicone tube body 1 can not only penetrate into the second lumen 311b by its own elastic force, but also fit closely with the inner wall of the decompression sleeve 31 under the action of rebound, effectively improving the situation where air enters the silicone tube body 1 from the second lumen 311b and causes bubbles to appear in the entire PICC catheter. In this embodiment, the difference between the outer diameter of the silicone tube body 1 in the non-deformed state and the width of the second lumen 311b is 0.8 times the thickness of the silicone tube body 1.

[0051] The difference between the width of the second lumen 311b and the outer diameter of the connecting tube 322 is 0.1 to 0.8 times the thickness of the silicone tube body 1 in the non-deformed state, so that the silicone tube body 1 can be tightly sleeved on the connecting tube 322, and use its own elastic force to squeeze into the gap between the connecting tube 322 and the decompression sleeve 31 in the second lumen 311b under compression, and then fit tightly with the inner wall of the decompression sleeve 31 under the action of rebound, effectively improving the situation where air enters the silicone tube body 1 from the first lumen 311a and causes bubbles in the entire PICC catheter. In this embodiment, the difference between the width of the second lumen 311b and the outer diameter of the connecting tube 322 is 0.5 times the thickness of the silicone tube body 1 in the non-deformed state.

[0052] like Figure 3 and 4As shown, the right end of the extension tube body 21 is provided with an extension tube joint 2, and the extension tube joint 2 can be a thermoplastic plastic extension tube joint, such as a polyethylene extension tube joint, a polyvinyl chloride extension tube joint, a polyurethane extension tube joint or a polyethylene terephthalate extension tube joint. In this embodiment, a polyurethane extension tube joint is used. The thermoplastic plastic extension tube and the thermoplastic plastic extension tube joint can be formed by hot melting and cooling the plastic material. The silicone tube body 1 can be formed by heating and curing silicone. Because the two are completely opposite molding processes, it is very difficult to connect the polyurethane extension tube to the silicone tube body or to connect the silicone extension tube to the polyurethane tube body in the existing process. Therefore, the existing technology uses a polyurethane extension tube to connect the polyurethane tube body to form a full polyurethane PICC catheter, or uses a silicone extension tube to connect the silicone tube body 1 to form a full silicone PICC catheter. In this embodiment, in order to solve the bubble problem, the applicant must stably and tightly connect the polyurethane epitaxial tube to the silicone tube body 1. In the process of continuous research, the applicant selected the connector 3 formed by hot-melt cooling of the plastic material with the above structure, and realized the connection between the silicone tube body 1 and the thermoplastic plastic epitaxial tube body 21 through the connector 3. Specifically, during installation and use, firstly, one end of the silicone tube body 1 is inserted into the decompression sleeve 31, and then the other end of the silicone tube body 1 is sleeved and fixed on the connecting tube 322, and the connecting tube 322 is extended into the first cavity 311a until the protrusion 326 of the joint seat 32 and the groove 313 of the decompression sleeve 31 are completely engaged, thereby realizing the connection and fixation of the silicone tube body 1 and the connector 3, and then the connection and fixation of the connector 3 and the epitaxial tube body 21 can be realized by an adhesive or in advance by a hot-melt injection molding process, that is, the silicone tube body 1 and the epitaxial tube body 21 can be connected and fixed through the connector 3, and the assembly of the silicone central venous catheter is realized.

[0053] In this embodiment, the connector 3 includes a first slope 312 located at the end of the decompression sleeve 31 close to the connector seat 32 and a second slope 323 located at the end of the connector seat 32 close to the decompression sleeve 31. The width of the first slope 312 at the end close to the connector seat 32 is smaller than the width of the first slope 312 at the end away from the connector seat 32. The second slope 323 abuts against the end surface of the first slope 312, which can improve the tightness of the connection between the connector seat 32 and the decompression sleeve 31, reduce the occurrence of air entering through the gap between the connector seat 32 and the decompression sleeve 31, and is easy to align and convenient to install.

[0054] like Figure 1 and 4As shown, in this embodiment, the silicone central venous catheter also includes a silicone base 325 and a slot 324. The slot 324 is arranged around the end of the connector seat 32 away from the decompression sleeve 31. A through hole is arranged in the center of the silicone base 325. After the silicone base 325 is embedded in the slot 324, it is used to fix the extension tube that is sleeved on the connector seat 32 and covers the slot 324. When assembled for use, the extension tube is first sleeved on the connector seat 32 and covers the slot 324 of the connector seat 32, and then the silicone base 325 is embedded in the slot 324. This can not only further fix the extension tube and the connector seat 32, but also facilitate the patient's use and make it more comfortable.

[0055] Example 2

[0056] The difference between this embodiment and embodiment 1 is that the epitaxial tube body 21 used in this embodiment is a polyethylene epitaxial tube, and the epitaxial tube joint 2 used is a polyethylene epitaxial tube joint.

[0057] Example 3

[0058] The difference between this embodiment and embodiment 1 is that the epitaxial tube body 21 used in this embodiment is a polyvinyl chloride epitaxial tube, and the epitaxial tube joint 2 used is a polyvinyl chloride epitaxial tube joint.

[0059] Example 4

[0060] The only difference between this embodiment and Embodiment 1 is that, in this embodiment, the difference between the outer diameter of the silicone tube body 1 in the non-deformed state and the width of the second cavity 311 b is 0.

[0061] Example 5

[0062] The only difference between this embodiment and the first embodiment is that, in this embodiment, the difference between the width of the second cavity 311 b and the outer diameter of the connecting tube 322 is 0.9 times the thickness of the silicone tube body 1 in the non-deformed state.

[0063] Comparative Example 1

[0064] The only difference between this comparative example and Example 1 is that the epitaxial tube body 21 used in this comparative example is a silicone tube body.

[0065] Experimental example

[0066] Following the clinical use method, the silicone central venous catheters in Examples 1-5 and Comparative Example 1 were respectively used for the following operations: first, the complete silicone PICC catheter was filled with physiological saline, the air was exhausted, and the extension tube joint was sealed with an infusion joint. Then, 3 / 4 of the length of the silicone tube body of the PICC catheter was immersed in water with a height of 12 cm of water column (this height is equivalent to the human venous pressure), and the number of bubbles generated in the extension tube was observed and recorded for 7 days.

[0067]

[0068] It can be seen from the above table that compared with comparative example 1, the silicone PICC catheters in Examples 1-5 of the present invention can significantly reduce the generation of bubbles, and the use of the polyurethane epitaxial tube in Example 1 is better than the use of the polyethylene epitaxial tube and the polyvinyl chloride epitaxial tube. Compared with Examples 4-5, Example 1 can further reduce the generation of bubbles by controlling the parameters in the silicone PICC catheter.

[0069] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A silicone central venous catheter, characterized in that: include: Silicone tube body (1); An epitaxial tube body (21), wherein the epitaxial tube body (21) is a thermoplastic plastic epitaxial tube; A connector (3) for connecting and fixing the silicone tube body (1) and the extension tube body (21); a connecting cavity is provided inside the connector (3); one end of the connector (3) is passed through and fixed by the silicone tube body (1) and is connected to the silicone tube body (1); and the other end of the connector (3) is fixed to the extension tube body (21) and is connected to each other; The connector (3) comprises: a decompression sleeve (31), the interior of which is provided with a first cavity (311) for the silicone tube body (1) to pass through; A joint seat (32) is provided with a second cavity (321) interconnected with the first cavity (311) inside, and the joint seat (32) is provided with a connecting pipe (322) extending into the first cavity (311) for the silicone tube body (1) to be sleeved and fixed, the first cavity (311) and the second cavity (321) are connected through the connecting pipe (322), and one end of the joint seat (32) located on the outside is mutually clamped with the decompression sleeve (31); The first cavity (311) comprises: A first cavity (311a) is located at one end close to the connector seat (32) and is for the connecting pipe (322) to extend into; A second cavity (311b) located at an end away from the connector seat (32) and connected to the first cavity (311a); The width of the first cavity (311a) is greater than the width of the second cavity (311b), the outer diameter of the silicone tube body (1) in a non-deformed state is greater than the width of the second cavity (311b), and the outer diameter of the silicone tube body (1) in a non-deformed state is smaller than the width of the first cavity (311a); The connector (3) further comprises: A first slope (312) is located at an end of the decompression sleeve (31) close to the joint seat (32), and a width of the first slope (312) at the end close to the joint seat (32) is smaller than a width of the first slope (312) at the end away from the joint seat (32); The second slope (323) is located at an end of the joint seat (32) close to one end of the decompression sleeve (31), and the end surfaces of the second slope (323) and the first slope (312) are in contact with each other.

2. The silicone central venous catheter according to claim 1, characterized in that: The thermoplastic plastic epitaxial tube is any one of a polyethylene epitaxial tube, a polyvinyl chloride epitaxial tube, a polyurethane epitaxial tube and a polyethylene terephthalate epitaxial tube.

3. The silicone central venous catheter according to claim 1, characterized in that: The difference between the outer diameter of the silicone tube body (1) in a non-deformed state and the width of the second cavity (311b) is 0.1 to 2 times the thickness of the silicone tube body (1).

4. The silicone central venous catheter according to claim 1 or 3, characterized in that: The difference between the width of the second cavity (311b) and the outer diameter of the connecting tube (322) is 0.1 to 0.5 times the thickness of the silicone tube body (1) in a non-deformed state.

5. The silicone central venous catheter according to claim 1, characterized in that: The silicone central venous catheter also includes: A card slot (324) is disposed around an end of the joint seat (32) that is away from the decompression sleeve (31); A silicone base (325) is provided with a through hole at the center. After being embedded in the card slot (324), the silicone base (325) is used to fix the extension tube which is sleeved on the joint seat (32) and covers the card slot (324).

6. The silicone central venous catheter according to claim 1, characterized in that: The connector (3) further comprises a groove (313) located on the decompression sleeve (31) and a protrusion (326) located on the connector seat (32); the protrusion (326) cooperates with the groove (313) to achieve a snap connection between the decompression sleeve (31) and the connector seat (32).

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