CN109568772B

CN109568772B - Variable-diameter central venous catheter and preparation method thereof

Info

Publication number: CN109568772B
Application number: CN201811391185.8A
Authority: CN
Inventors: 潘彩云; 常凤如; 张正才
Original assignee: Beijing Target Technology Co ltd
Current assignee: Beijing Target Technology Co ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2021-03-23
Anticipated expiration: 2038-11-21
Also published as: CN109568772A

Abstract

The invention relates to the technical field of medical instruments, in particular to a diameter-variable central venous catheter and a preparation method thereof. The variable-diameter central venous catheter at least comprises a main catheter body and an extension catheter which are connected, wherein the main catheter body is composed of a variable-diameter section and an equal-diameter section which are connected, the outer diameter of the variable-diameter section is gradually reduced from a first end to a second end, the first end of the variable-diameter section is connected with the extension catheter, and the second end of the variable-diameter section is connected with the equal-diameter section. This reducing central venous catheter can effectively prevent because thrombus, the difficult, stifled pipe of tube drawing, infection pipe, fracture or the leakage scheduling problem that arouse when central venous catheter keeps somewhere, reduces the painful and economic burden that the patient kept somewhere the pipe, improves medical personnel's maintenance work efficiency simultaneously, reduces work load.

Description

Variable-diameter central venous catheter and preparation method thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to a diameter-variable central venous catheter and a preparation method thereof.

Background

With the continuous development of modern medicine in the medical instrument industry, the central venous catheter is widely applied to the traumatic diagnosis and treatment fields of heavy patient rescue treatment, chemotherapy, blood purification treatment, total parenteral nutrition, extremely-low-weight premature infants and the like in clinical medical work, and is one of conventional and necessary medical appliances. However, in clinical practice, the central venous catheter is mostly made into a catheter with an equal diameter, and the longer the central venous catheter is kept, the more easily the central venous catheter causes complications such as blockage of the catheter, thrombus, phlebitis, bacterial infection, formation of fibrin sheath, and difficulty in catheter pulling, and the joint of the main tube body and the extension tube is easily damaged, so that the pain and the economic burden of a patient are increased, the workload of medical staff is increased, and the work efficiency of the medical staff is reduced.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a variable-diameter central venous catheter and a preparation method thereof, which solve the problems of the existing central venous catheter with the same diameter that complications such as blockage of the catheter, thrombus, blood return, difficult catheter extraction and the like are easily caused when the catheter is placed.

(II) technical scheme

In order to solve the technical problem, the invention provides a reducing central venous catheter which at least comprises a main pipe body and an extension pipe which are connected, wherein the main pipe body is composed of a reducing section and an equal-diameter section which are connected, the outer diameter of the reducing section is gradually reduced from a first end to a second end, the first end of the reducing section is connected with the extension pipe, and the second end of the reducing section is connected with the equal-diameter section.

Specifically, the outer surface of the variable diameter section smoothly transitions from the first end to the second end, or the outer surface of the variable diameter section changes in a step from the first end to the second end.

Specifically, the inner diameters of the variable diameter sections are equal, or the inner diameters of the variable diameter sections are gradually reduced from the first end to the second end.

Further, still include the fixing base, the fixing base is installed outside the main pipe body and the extension union coupling department.

The extension pipe is connected with the extension pipe through a pipe seat, the pipe seat consists of a first installation part and a second installation part, and the first installation part and the second installation part are clamped and matched; a gasket is arranged between the first mounting part and the second mounting part, and the gasket is provided with a notch; the first installation part and the second installation part are respectively provided with installation grooves for installing the gasket.

In order to solve the technical problem, the invention also provides a preparation method of the radial central venous catheter, wherein the diameter-variable central venous catheter is the diameter-variable central venous catheter, and the method at least comprises the following steps:

s1, preparing a main pipe body die, wherein the main pipe body die consists of a reducing section and an equal-diameter section which are connected, the inner diameters of the equal-diameter section are equal, the inner diameter of the reducing section is gradually reduced from a first end to a second end, and the second end of the reducing section is connected with the equal-diameter section;

s2, selecting a mandrel, wherein the length of the mandrel is greater than that of the main pipe body die, sleeving a first pipe on the mandrel, the length of the first pipe is greater than that of the equal-diameter section of the main pipe body die, installing the mandrel into the main pipe body die, enabling the first end of the first pipe to extend out of the equal-diameter section of the main pipe body die, and enabling the second end of the first pipe to be located in the variable-diameter section of the main pipe body die;

s3, sleeving a second pipe on the mandrel, enabling the second pipe to be located in the reducing section of the main pipe body mould, butting the first end of the second pipe with the second end of the first pipe, and enabling the second end of the second pipe to extend out of the reducing section of the main pipe body mould;

s4, heating the main pipe body mould to enable the butt joint of the second pipe and the first pipe to be in thermal connection, keeping the position of the first pipe in the main pipe body mould unchanged, and rotationally pushing the second pipe into the main pipe body mould until the diameter-variable section of the main pipe body mould is completely filled by the second pipe;

s5, cooling the main pipe body die;

s6, taking the mandrel out of the main pipe mold, and taking the butted first pipe and second pipe from the mandrel to obtain the main pipe.

Further, in step S1, preparing the main pipe mold specifically includes the following steps:

selecting a steel core, and polishing the steel core to ensure that the outer diameter of the steel core is consistent with the inner diameter of the main pipe body die;

selecting a PTFE pipe, wherein the length of the PTFE pipe is greater than that of the steel core;

heating the steel core, and taking out the steel core after a preset time;

inserting the heated steel core into the PTFE tube to completely attach the PTFE tube to the steel core;

cooling the steel core;

cutting the PTFE pipes at the edges of the two ends of the steel core in a flush manner;

and taking down the PTFE pipe from the steel core to obtain the main pipe body die.

Further, still include: the inner wall and the outer wall of the main pipe body are respectively coated with anti-infective drug coatings.

Further, still include:

carrying out thermal welding on one end of the extension pipe and the reducer section of the main pipe body;

a fixed seat is arranged outside the connection part between the main pipe body and the extension pipe;

and a pipe seat is arranged at the other end of the extension pipe.

Further, the method also comprises a step of preparing the tube seat, and specifically comprises the following steps:

arranging a notch on the gasket;

installing the gasket in an installation groove between a first installation part and a second installation part of the tube seat;

and carrying out ultrasonic welding on the first mounting part and the second mounting part of the tube seat.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

the invention provides a reducing central venous catheter and a preparation method thereof.A main pipe body is arranged into a pipe body structure consisting of a reducing section and an equal-diameter section, so that the outer diameter of the reducing section is gradually reduced from a first end to a second end, the first end of the reducing section is connected with an extension pipe, and the second end of the reducing section is connected with the equal-diameter section, thereby effectively preventing the problems of thrombus, difficult pipe drawing, pipe blockage, catheter infection, fracture or leakage and the like caused by the indwelling central venous catheter, reducing the pain and the economic burden of the indwelling catheter of a patient, simultaneously improving the maintenance work efficiency of medical care personnel and reducing the work load.

Drawings

FIG. 1 is a schematic structural diagram of a variable diameter central venous catheter in accordance with an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a tube seat in a variable-diameter central venous catheter according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of a gasket in the variable diameter central venous catheter according to the embodiment of the invention.

In the figure: 1: a primary tube; 101: a diameter-changing section; 102: a constant diameter section; 2: an extension tube; 3: a fixed seat; 4: a tube holder; 401: a first mounting portion; 402: a second mounting portion; 5: a gasket; 501: and (6) cutting.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention provides a variable diameter central venous catheter, which includes a main tube 1, an extension tube 2, a fixing base 3 and a tube base 4.

The main pipe body 1 is composed of a variable diameter section 101 and a constant diameter section 102 which are connected, wherein the outer diameter of the variable diameter section 101 is gradually reduced from a first end to a second end. A first end of the variable diameter section 101 is connected to the extension pipe 2, and a second end of the variable diameter section 101 is connected to the constant diameter section 102. The outer diameter of the constant diameter section 102 is equal to the outer diameter of the second end of the variable diameter section 101, and the inner diameter of the constant diameter section 102 is equal to the inner diameter of the second end of the variable diameter section 101.

According to the diameter-variable central venous catheter disclosed by the embodiment of the invention, the main pipe body 1 is arranged into a pipe body consisting of the diameter-variable section 101 and the diameter-constant section 102, so that the outer diameter of the diameter-variable section 101 is gradually reduced from one end to the other end, the problems of thrombus, difficult catheter extraction, catheter blockage, catheter infection, fracture or leakage and the like caused by the indwelling central venous catheter can be effectively prevented, the pain and the economic burden of the indwelling catheter of a patient are reduced, the maintenance work efficiency of medical personnel is improved, and the workload is reduced.

Specifically, the outer diameter of the reducer section 101 changes mainly in the following two forms:

in the first embodiment, the outer surface of the reducing section 101 smoothly transitions from the first end to the second end, that is, the outer surface of the reducing section 101 is in a circular truncated cone shape or a trumpet shape.

In the second embodiment, the outer surface of the variable diameter section 101 is stepped from the first end to the second end, and the connection between the steps and the corner of each step are smooth transitions.

That is, the outer diameter of the diameter-variable section 101 may be ensured to be gradually reduced from one end to the other end as a whole.

in the first embodiment, the inner diameters of the variable diameter sections 101 are all equal.

In the second embodiment, the inner diameter of the variable diameter section 101 is gradually reduced from the first end to the second end. That is, the inner diameter of the variable diameter section 101 may be changed in accordance with the outer diameter of the variable diameter section 101.

Further, the fixing seat 3 is installed outside a connection position of the main pipe 1 and the extension pipe 2.

Further, the tube holder 4 is connected to the extension tube 2. The tube holder 4 is composed of a first mounting portion 401 and a second mounting portion 402, and the first mounting portion 401 and the second mounting portion 402 are fitted by being clamped. A spacer 5 is disposed between the first mounting portion 401 and the second mounting portion 402, the spacer 5 is provided with a notch 501, and the notch 501 may be a channel-shaped notch. The first mounting portion 401 and the second mounting portion 402 are respectively provided with mounting grooves for mounting the gasket 5. The gasket 5 with the notch 501 is attached between the first attaching portion 401 and the second attaching portion 402 of the stem 4, thereby preventing backflow.

Specifically, the gasket 5 is preferably made of silicone, rubber, hybrid silicone, or hybrid rubber material.

Specifically, the extension pipe 2 is preferably a PU pipe.

Specifically, the main pipe body 1 is preferably made of an elastic polyurethane or polyethylene material.

The embodiment of the invention also provides a preparation method of the reducing central venous catheter, wherein the reducing central venous catheter is the reducing central venous catheter in the embodiment, and the method specifically comprises the following steps:

s1, preparing a main pipe body die, wherein the main pipe body die is composed of a reducing section and an equal-diameter section which are connected, the inner diameters of the equal-diameter section are equal, the inner diameter of the reducing section is gradually reduced from a first end to a second end, and the second end of the reducing section is connected with the equal-diameter section. That is, the inner diameter of the main pipe mold is consistent with the outer diameter of the main pipe 1 to be prepared.

S2, selecting a mandrel, wherein the length of the mandrel is larger than that of the main pipe body die, and sleeving a first pipe on the mandrel. Wherein, the outer diameter of the first pipe is consistent with the outer diameter of the equal-diameter section of the main pipe body to be prepared. And then, the mandrel is arranged in the main pipe body mould, so that the first end of the first pipe extends out of the constant-diameter section of the main pipe body mould, and the second end of the first pipe is positioned in the variable-diameter section of the main pipe body mould. The length of the first pipe in the reducing section of the main pipe mould is more than or equal to 3mm, so that a certain length is reserved for the subsequent butt joint with the second pipe.

And S3, sleeving a second pipe on the mandrel, and enabling the second pipe to be located in the reducing section of the main pipe body mould. And then butting the first end of the second pipe with the second end of the first pipe, wherein the second end of the second pipe extends out of the reducing section of the main pipe body mould.

S4, heating the main pipe body die at the heating temperature of 250-380 ℃. And thermally connecting the joint of the second pipe and the first pipe, keeping the position of the first pipe in the main pipe body mould unchanged, and rotationally pushing the second pipe into the main pipe body mould until the diameter-variable section of the main pipe body mould is completely filled by the second pipe.

And S5, cooling the main pipe body mould, wherein the cooling mode can adopt natural cooling or cooling in cooling liquid.

And S6, after the main pipe mold is completely cooled, taking the mandrel out of the main pipe mold, and taking the butted first pipe and second pipe from the mandrel to obtain the required main pipe 1, wherein the outer diameter of the main pipe 1 is consistent with the inner diameter of the main pipe mold.

S7, coating anti-infective drug coatings on the inner wall and the outer wall of the main pipe body 1 respectively, thereby obtaining the main pipe body with anti-infective function.

And S8, carrying out thermal welding on the variable-diameter section 101 of the main pipe body 1 and one end of the extension pipe 2.

S9, installing a fixing seat 3 outside the connection between the main pipe 1 and the extension pipe 2, where the fixing seat 3 may be installed outside the connection between the main pipe 1 and the extension pipe 2 by bonding.

And S10, installing a tube seat 4 at the other end of the extension tube 2, wherein the tube seat 4 can be bonded with the extension tube 2 through UV glue, or the tube seat 4 is connected with the extension tube 2 in an injection molding mode.

selecting a steel core, and polishing the steel core to ensure that the outer diameter of the steel core is consistent with the inner diameter of the main pipe body die. That is, the steel core also comprises constant-diameter and varying-diameter sections.

Selecting a PTFE pipe, wherein the length of the PTFE pipe is greater than that of the steel core.

And (3) putting the steel core into heating equipment for heating, wherein the heating temperature is more than or equal to 500 ℃, and taking out the steel core after heating for preset time.

And then inserting the heated steel core into the PTFE tube, wherein the steel core needs to be inserted into the PTFE tube from the outer end of the equal-diameter section of the steel core during insertion, so that the PTFE tube is completely attached to the steel core.

And then putting the steel core into cooling liquid for cooling until the steel core is completely cooled.

And then, the PTFE pipe is cut according to the edges of the two ends of the steel core in a flush manner.

And finally, taking down the PTFE pipe from the steel core to obtain the main pipe body die, wherein the inner diameter of the main pipe body die is consistent with the outer diameter of the steel core.

Assuming that A, B, C, D, E, F, G points are respectively marked on the steel core from left to right, the length of the section A-B is more than or equal to 25cm, the length of the section B-C is 1cm, the length of the section C-D is 1cm, the length of the section D-E is 1cm, the length of the section E-F is 1cm, and the length of the section F-G is more than or equal to 3 cm.

In one embodiment, the polished A-B section has an outer diameter of 1.3mm, the B-C section has an outer diameter of 1.35mm, the C-D section has an outer diameter of 1.4mm, the D-E section has an outer diameter of 1.45mm, the E-F section has an outer diameter of 1.5mm, and the F-G section has an outer diameter of 1.55 mm. That is, the sections a-B belong to the constant diameter section of the steel core, and the sections B-G belong to the variable diameter section of the steel core, wherein the outer surface of the variable diameter section of the steel core is stepped from B to G, so that the inner surface of the variable diameter section of the prepared main tubular body mold is stepped, and finally the outer surface of the prepared main tubular body 1 is stepped.

In another embodiment, the polished section a-B has an outer diameter of 1.3mm, the section a-B belongs to the constant diameter section of the steel core, the section B-G belongs to the variable diameter section of the steel core, the outer diameter at the point G is 1.55mm, and the outer surface of the section B-G is in smooth transition from the first end to the second end, so that the inner surface of the variable diameter section of the prepared main pipe body mold is in smooth transition, and finally the outer surface of the prepared main pipe body 1 is in smooth transition.

Further, the socket 4 in step S10 can be prepared by:

selecting a gasket 5, and arranging a notch 501 on the gasket 5, wherein the notch 501 is shaped like a Chinese character 'chuan'.

The spacer 5 is mounted in a mounting groove between the first mounting portion 401 and the second mounting portion 402 of the stem 4.

And ultrasonically welding the first mounting part 401 and the second mounting part 402 of the tube seat 4 to finally obtain the tube seat 4.

The diameter-variable central venous catheter prepared by the method has the advantages of simple and convenient operation, high dimensional accuracy and capability of preparing the diameter-variable central venous catheters with different dimensional requirements according to actual requirements.

In summary, the variable-diameter central venous catheter and the preparation method thereof according to the embodiment of the invention have the advantages that the main pipe body is of a pipe body structure consisting of the variable-diameter section and the equal-diameter section, so that the outer diameter of the variable-diameter section is gradually reduced from the first end to the second end, the first end of the variable-diameter section is connected with the extension pipe, and the second end of the variable-diameter section is connected with the equal-diameter section, so that the problems of thrombus, difficult tube drawing, tube blockage, catheter infection, breakage or leakage and the like caused by the indwelling central venous catheter can be effectively prevented, the pain and the economic burden of the indwelling catheter of a patient are reduced, the maintenance work efficiency of medical personnel is improved, and the workload is reduced.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, unless otherwise specified, "a plurality" means one or more; "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A diameter-variable central venous catheter at least comprises a main pipe body and an extension pipe which are connected, and is characterized in that the main pipe body is composed of a diameter-variable section and an equal-diameter section which are connected, wherein the outer diameter of the diameter-variable section is gradually reduced from a first end to a second end, the first end of the diameter-variable section is connected with the extension pipe, and the second end of the diameter-variable section is connected with the equal-diameter section;

the pipe seat is connected with the extension pipe and consists of a first installation part and a second installation part, and the first installation part and the second installation part are clamped and matched; a gasket is arranged between the first mounting part and the second mounting part, and the gasket is provided with a notch; the first mounting part and the second mounting part are respectively provided with mounting grooves for mounting the gasket;

the gasket is made of silica gel or rubber materials.

2. The variable diameter central venous catheter of claim 1, wherein the outer surface of the variable diameter section is a smooth transition from the first end to the second end or the outer surface of the variable diameter section is a step change from the first end to the second end.

3. The variable diameter central venous catheter of claim 1, wherein the inner diameters of the variable diameter sections are equal or gradually decrease from a first end to a second end.

4. The variable diameter central venous catheter of claim 1, wherein: the extension pipe is characterized by further comprising a fixed seat, wherein the fixed seat is arranged outside the connection position of the main pipe body and the extension pipe.