Venous cannula for percutaneous puncture

Abstract

The utility model relates to medical instrument technical field especially is a kind of intravenous cannula for percutaneous puncture, it includes cannula body, the internal guide ware of being set to cannula body front end and the connector of being set to cannula body back end, connector is communicated with cannula body back end, cannula body is hollowly arranged, the end of cannula body front end is provided with sharp end drainage hole, cannula body front end is communicated with internal guide ware by sharp end drainage hole, the outer peripheral wall ring of cannula body front end is provided with multiple drainage side holes, and one side wall of cannula body is provided with memory alloy steel wire.The utility model novel structure, clever design is applicable to the extracorporeal lung support when operation or the extracorporeal cardiopulmonary system support when intensive care, connect patient venous system and extracorporeal circulation pipeline, and the intravenous blood of passing through extracorporeal circulation equipment such as heart-lung machine is drained out of human body, the utility model meets the minimally invasive cardiac surgery approach requirement, and can shape not easily obstruct vision, convenient operation, and strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a venous catheter for percutaneous puncture. Background Technology

[0002] With the rapid development of cardiac surgery both domestically and internationally, venous catheterization has become widely used in cardiac surgery. Currently, almost all congenital heart disease, coronary heart disease, and valvular heart disease can be treated through surgery under traditional cardiopulmonary bypass. Venous catheterization is an indispensable component of cardiopulmonary bypass, suitable for surgical procedures with an external blood supply route. It connects the patient's venous system to the cardiopulmonary bypass tubing and is already routinely used. Traditional cardiac surgery involves opening the chest in the middle and inserting cannulas into the aorta, superior and inferior vena cava, or right atrium to establish cardiopulmonary bypass. Venous blood returning to the heart is drained to a special external device, where gas exchange, temperature regulation, and filtration are performed artificially before being returned to the internal arterial system. The purpose is to maintain blood supply to all organs and tissues during open-heart surgery, thus creating a good surgical field. Simultaneously, with the continuous advancement of medical technology, in addition to pursuing excellent surgical outcomes, the industry also aims to minimize surgical risks; cardiac surgery, like other fields, is inevitably moving towards minimally invasive procedures. Summary of the Invention

[0003] This invention addresses the problems in the prior art by providing a percutaneous venous catheter with a novel structure and ingenious design. It is suitable for external lung support during surgery or external cardiopulmonary support in intensive care. It connects the patient's venous system to the extracorporeal circulation pipeline, draining venous blood from the body through extracorporeal circulation equipment such as cardiopulmonary bypass machines. This invention meets the requirements of minimally invasive cardiac surgery access, and its shape is not easily obstructed, making it convenient to operate and highly practical.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides a percutaneous venous catheter, which includes a catheter body, an internal guide disposed at the front end of the catheter body, and a connector disposed at the rear end of the catheter body. The connector is connected to the rear end of the catheter body. The catheter body is hollow. A tip drainage hole is provided at the end of the front end of the catheter body. The front end of the catheter body is connected to the internal guide through the tip drainage hole. A plurality of drainage side holes are provided on the outer peripheral wall of the front end of the catheter body. A shape memory alloy steel wire is provided on one side wall of the catheter body.

[0006] The outer peripheral wall of the cannula is also provided with scale lines along its length.

[0007] The cannula also contains a steel wire layer. The steel wire layer is arranged circumferentially along the cannula.

[0008] The cannula body is made of polyurethane, and the steel wire layer is covered with polyurethane.

[0009] Preferably, the tip drainage hole is circular in shape.

[0010] Preferably, the drainage side hole is elliptical.

[0011] The drainage side holes are evenly distributed on the outer peripheral wall of the front end of the cannula.

[0012] The percutaneous venous catheter also includes a tube cap, which is used to cover the connector to seal the rear end of the catheter body.

[0013] The connector is also provided with an exhaust port.

[0014] The beneficial effects of this utility model are:

[0015] This utility model features a novel structure and ingenious design. It is suitable for extracorporeal lung support during surgery or extracorporeal cardiopulmonary bypass during intensive care. It connects the patient's venous system to the extracorporeal circulation tubing, draining venous blood from the body after passing through extracorporeal circulation equipment such as a cardiopulmonary bypass machine. In use, a puncture needle is used to puncture the selected jugular vein. A guidewire is inserted into the blood vessel through the puncture needle, ensuring unobstructed insertion of at least 30 cm and marking the insertion point. The puncture needle can then be removed. A scalpel is used to enlarge the incision. An expansion column is used to widen the incision, ensuring the incision size matches the size of the expansion column. Expansion and insertion of the disposable cannula must be performed simultaneously. This utility model features a section on one side wall of the cannula. A medical-grade malleable shape memory alloy steel wire is embedded within the cannula, facilitating bending, fixation, and adjustment at predetermined angles. This invention involves inserting a guidewire, with the cannula being carefully and slowly advanced along the blood vessel by gripping the inlet with two fingers. An assistant holds the guidewire to avoid further complicating the surgical procedure, thus minimizing the risk of vascular damage. Once the cannula is in place, the guidewire, dilation column, and vent plug are removed. A medical-grade malleable shape memory alloy steel wire is embedded in the side wall of the cannula, facilitating bending, fixation, and adjustment at predetermined angles. This invention meets the requirements of minimally invasive cardiac surgery access, is malleable without obstructing the field of vision, is easy to operate, and is highly practical. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of the structure of a percutaneous venous catheter according to the present invention.

[0017] Fig. 2This is a schematic diagram of the cannula body of this utility model.

[0018] Fig. 3 This is a schematic diagram of the structure of the scalpel, guidewire, clamp, and puncture needle used in this utility model.

[0019] exist Figs. 1-3 The reference numerals in the figures include:

[0020] 1. Tube cap; 2. Connector; 3. Cannula body; 4. Shape memory alloy steel wire; 5. Internal guide; 6. Scalpel; 7. Guide wire; 8. Tube clamp; 9. Puncture needle; 10. Tip drainage hole; 11. Drainage side hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. It is understood that the accompanying drawings are provided for reference and illustration only and are not intended to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection method.

[0022] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be noted that, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0023] It should also be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] like Figs. 1-3 As shown, a percutaneous venous catheter includes a catheter body 3, an internal guide 5 disposed at the front end of the catheter body 3, and a connector 2 disposed at the rear end of the catheter body 3. The connector 2 communicates with the rear end of the catheter body 3. The catheter body 3 is hollow. A tip drainage hole 10 is provided at the front end of the catheter body 3. The front end of the catheter body 3 communicates with the internal guide 5 through the tip drainage hole 10. A plurality of drainage side holes 11 are provided around the outer peripheral wall of the front end of the catheter body 3. A shape memory alloy steel wire 4 is provided on one side wall of the catheter body 3. The tip drainage hole 10 is circular, and the drainage side holes 11 are elliptical. The plurality of drainage side holes 11 are evenly distributed on the outer peripheral wall of the front end of the catheter body 3. Specifically, this utility model features a novel structure and ingenious design. The embodiments of this application are applicable to extracorporeal lung support during surgery or extracorporeal cardiopulmonary bypass during intensive care. It connects the patient's venous system to the extracorporeal circulation tubing, draining venous blood from the body after passing through extracorporeal circulation equipment such as a cardiopulmonary bypass machine. In use, this embodiment is equipped with a scalpel 6, a guidewire 7, a clamp 8, and a puncture needle 9. During use, the puncture needle 9 is used to puncture the selected jugular vein. The guidewire 7 is inserted into the blood vessel through the puncture needle 9. The guidewire must be inserted at least 30 cm without resistance and marked. At this point, the puncture needle 9 can be removed. The scalpel 6 is used to enlarge the incision. The dilator is used to expand the incision, making the incision size suitable for the insertion and dilation column. The sizing, expansion, and insertion of the disposable cannula are completed simultaneously. In this embodiment, the guidewire 7 is inserted, and the cannula body 3 is held with two fingers at the inlet to guide it carefully and slowly along the direction of the blood vessel. At the same time, an assistant holds the guidewire 7 to avoid further increasing the difficulty of the operation, thereby minimizing the risk of vascular damage. When the disposable cannula of this embodiment is in place, the guidewire 7, the dilation column, and the vent plug are removed. In this embodiment, a medical-grade malleable shape memory alloy steel wire 4 is embedded in the side wall of the cannula body 3 to facilitate bending, fixing, and adjustment at a predetermined angle. This utility model meets the requirements of minimally invasive cardiac surgery approach, and is malleable without obstructing the field of vision, making it easy to operate and highly practical.

[0025] In this embodiment, the outer peripheral wall of the cannula 3 is further provided with graduation lines along its length. Specifically, this arrangement facilitates clinical observation of the insertion depth in this embodiment.

[0026] In this embodiment, a steel wire layer is further provided inside the cannula body 3. The steel wire layer is arranged circumferentially along the cannula body 3; the cannula body 3 is made of polyurethane, and the steel wire layer is covered by polyurethane. Specifically, the cannula body 3 is a thin-walled polyurethane intravenous cannula reinforced with steel wires all over its body, and the steel wire-reinforced cannula body 3 can prevent bending and suction.

[0027] In this embodiment, the percutaneous venous catheter further includes a cap 1, which is used to cover the connector 2 to seal the rear end of the catheter body 3. Specifically, this configuration effectively prevents particles from entering the catheter.

[0028] In this embodiment, the connector 2 is further provided with a vent. Specifically, this feature facilitates the timely and effective removal of gas from the tube during clinical drainage.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A venous catheter for percutaneous puncture, characterized in that: The device includes an intubation cannula, an internal guide located at the front end of the intubation cannula, and a connector located at the rear end of the intubation cannula. The connector is connected to the rear end of the intubation cannula. The intubation cannula is hollow. A tip drainage hole is provided at the front end of the intubation cannula. The front end of the intubation cannula is connected to the internal guide through the tip drainage hole. Multiple drainage side holes are provided around the outer peripheral wall of the front end of the intubation cannula. A shape memory alloy steel wire is provided on one side wall of the intubation cannula.

2. The venous catheter for percutaneous puncture according to claim 1, characterized in that: The outer peripheral wall of the cannula is also provided with scale lines along its length.

3. A percutaneous venous catheter according to claim 1, characterized in that: The cannula body is also provided with a steel wire layer, which is arranged circumferentially along the cannula body.

4. A percutaneous venous catheter according to claim 3, characterized in that: The cannula body is made of polyurethane, and the steel wire layer is covered with polyurethane.

5. A percutaneous venous catheter according to claim 1, characterized in that: The tip drainage hole is circular in shape.

6. A percutaneous venous catheter according to claim 1, characterized in that: The drainage side hole is elliptical.

7. A percutaneous venous catheter according to claim 1, characterized in that: Multiple drainage side holes are evenly distributed on the outer peripheral wall of the front end of the cannula.

8. A percutaneous venous catheter according to claim 1, characterized in that: The percutaneous venous catheter also includes a tube cap, which is used to cover the connector to seal the rear end of the catheter body.

9. A percutaneous venous catheter according to claim 1, characterized in that: The connector is also provided with an exhaust port.

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