Extracorporeal circulation venous cannula kit

Abstract

The utility model relates to a kind of extracorporeal circulation venous intubation kits, including venous intubation, the venous intubation has hollow drainage cavity, is divided into front section, middle section and rear section, wherein the diameter of front section is less than the diameter of rear section, the middle section is transition section and is conical, the front section is equipped with support part, the support part is enclosed by several support strips, spacing is equipped between each support strip, the middle part of front section tip is drainage hole one, support steel wire is equipped in the venous intubation, thread tooth is equipped around the head of rear section, venous intubation is connected with guide core cover through connecting piece, guide wire passes through guide core, and venous intubation is guided into blood vessel by guide wire, the utility model structure is simple, can effectively prevent that venous intubation because patient blood volume is insufficient and the effect of exerting negative pressure leads to that the blood flow hole of venous intubation is wrapped, blocked by blood vessel inner wall, influence the effect of venous drainage.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, it relates to an extracorporeal circulation intravenous cannulation kit. Background Technology

[0002] With the continuous development of minimally invasive cardiac surgery, percutaneous femoral vein and internal jugular vein catheterization are widely used in cardiac surgery. In minimally invasive cardiac surgery, venous catheters are inserted into the superior vena cava via the internal jugular vein and into the inferior vena cava via the femoral vein. Blood from both vena cava drains through the venous catheter into a reservoir vessel, becomes oxygenated after passing through an artificial oxygenator, and is then pumped into the patient's aorta, completing the entire process of extracorporeal circulation. During extracorporeal circulation, a negative pressure of -20 to -40 mmHg needs to be applied to the reservoir vessel to ensure smooth blood flow from both vena cava to the reservoir vessel. Existing venous catheters have blood outflow ports on the sides of the catheter, such as... Figure 1 Often, due to insufficient blood volume in patients and the application of negative pressure, the blood outflow hole of the venous catheter is wrapped and blocked by the inner wall of the blood vessel, affecting the effectiveness of venous drainage.

[0003] A search revealed patent number 201120219190.8, which discloses a grooved extracorporeal circulation venous cannula, belonging to the field of venous cannula technology. It includes a tube body and a scale, as well as a groove on the tube body. The groove is arc-shaped and located at a position between 5 mm and 9 mm on the scale. The advantage is that when used during cardiac surgery, medical personnel can directly feel the groove on the tube body by hand, place the corresponding cannula in the groove, and then tighten it with a ligature. The operation is simple and convenient. The corresponding cannula fits perfectly into the groove, ensuring no gaps after tightening and preventing air from entering the bloodstream, thus improving surgical safety. However, there is a risk that the drainage hole can be easily blocked by the negative pressure applied to the inner wall of the blood vessel. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to solve the problem that the blood outflow hole of venous catheters is easily wrapped and blocked by the inner wall of blood vessels due to insufficient blood volume in patients and the application of negative pressure. This invention provides a simple structure, good performance, and effective prevention of the problem of poor venous blood drainage caused by the influence of negative pressure on the blood vessel wall.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an extracorporeal circulation intravenous cannula kit, including an intravenous cannula, the intravenous cannula having a hollow drainage cavity, divided into a front section, a middle section and a rear section, wherein the diameter of the front section is smaller than the diameter of the rear section, the middle section is a transition section in the shape of a cone, the front section is provided with a support part, the support part is formed by a plurality of support strips, each support strip is spaced apart, the middle of the end of the front section is a drainage hole, the intravenous cannula is provided with a support wire, the rear section has threaded teeth around its head, the intravenous cannula is connected to the guide core through a connector, the guide wire passes through the guide core, and the intravenous cannula is guided into the blood vessel through the guide wire.

[0006] In one embodiment: the support strip is elastic, and the support strip is raised in its natural state. When the guide core is inserted, it is straightened under the traction of the guide core.

[0007] In one embodiment: both the front and rear ends of the support are provided with drainage holes.

[0008] In one embodiment: the guide core is hollow, and a guide wire can pass through the hollow part. A connector is provided at the end of the guide core. One end of the connector is fitted with a venous catheter, and the other end of the connector is a joint.

[0009] In one embodiment, the guide core is cone-shaped as it enters the head of the blood vessel.

[0010] In one embodiment, the guide core entering the blood vessel head is round-headed.

[0011] In one embodiment, the tip of the venous cannula is cone-shaped.

[0012] In one embodiment: the venous cannula has a supporting steel wire section as a partition, and the supporting steel wire is located inside the partition.

[0013] In one embodiment, the intravenous catheter is made of a material with good transparency and good toughness.

[0014] In summary, this utility model has the following beneficial effects:

[0015] Firstly, the structure is simple, and the design of the support part can effectively prevent the blood outflow hole of the venous catheter from being wrapped and blocked by the inner wall of the blood vessel due to insufficient blood volume of the patient and the application of negative pressure, thus affecting the effect of venous flow.

[0016] Secondly, blood can enter the venous catheter through drainage hole one, the gap between the support strips, and drainage hole two at the tip of the venous catheter, increasing the blood drainage path.

[0017] Thirdly, the design of the supporting steel wire can enhance the expansion of the venous catheter to prevent twisting that could obstruct drainage and ensure sufficient venous blood drainage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the intravenous cannulation structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the guide core structure of this utility model;

[0020] Figure 3 This is a diagram showing the usage state of this utility model;

[0021] Figure 4 This is a schematic diagram of the guidewire and catheter sleeve structure of this utility model;

[0022] Figure 5 This is a diagram showing the blood flow state of a venous cannula inserted into a blood vessel according to this utility model.

[0023] In the diagram: 1. Intravenous cannula; 2. Anterior section; 3. Middle section; 4. Rear section; 5. Support section; 6. Support bar; 7. Spacing; 8. Support wire; 9. Threaded teeth; 10. Connector; 11. Guide core; 12. Connector; 13. Drainage hole one; 14. Drainage hole two. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It is worth noting that the directional terms such as "up" and "down" used in this article are all relative to the perspective of the attached figures and are only for the purpose of description. They should not be interpreted as limitations on the technical solutions.

[0026] See Figures 1 to 5 An extracorporeal circulation intravenous cannula kit includes an intravenous cannula 1, which has a hollow drainage cavity and is divided into a front section 2, a middle section 3, and a rear section 4. The diameter of the front section 2 is smaller than that of the rear section 4. The middle section 3 is a transition section in the shape of a cone. The front section 2 is provided with a support part 5, which is formed by several support bars 6. There is a spacing 7 between each support bar 6. The design of the spacing 7 and the drainage hole 13 at the middle of the end of the front section 2 increases the blood drainage path. The intravenous cannula 1 is provided with a support wire 8. The rear section 4 is provided with threaded teeth 9 around its head. The intravenous cannula 1 is connected to the guide core 11 through a connector 10. The guide wire passes through the guide core 11 and guides the intravenous cannula 1 into the blood vessel.

[0027] The support strip 6 is elastic and is raised in its natural state. When the guide core 11 is inserted, it is straightened under the traction of the guide core 11. When the venous catheter 1 enters the blood vessel, the support strip 6 is straightened under the traction of the guide core 11. When the guide core 11 is pulled out, the support strip 6 will bulge under the elastic action, which will open up the inner wall of the blood vessel and effectively prevent the blood vessel wall from being affected by negative pressure drainage, so that the blood outflow hole is easily wrapped and blocked by the inner wall of the blood vessel, thus affecting the effect of venous drainage.

[0028] The support is provided with drainage holes at both the front and rear ends to facilitate blood drainage.

[0029] The guide core 11 is hollow, and the hollow part can pass through the guide wire. The end of the guide core 11 is provided with a connector 10. One end of the connector 10 is sleeved with the venous catheter, and the other end of the connector is a connector. The connector 10 is sleeved with the threaded teeth 9 of the venous catheter 1. The venous catheter 1 and the guide core 11 are firmly connected by the meshing of the threaded teeth 9. The connector at the other end is connected to the extracorporeal circulation tubing, and then extracorporeal blood circulation is performed.

[0030] The guide core 11 is cone-shaped when it enters the head of the blood vessel.

[0031] The above-mentioned technology facilitates the insertion of the venous cannula into the blood vessel.

[0032] The guide core 11 is round-headed when it enters the head of the blood vessel.

[0033] The above technical solution allows the support part 5 of the intravenous cannula 1 to be retracted and straightened, and the round-headed guide core 11 can avoid damaging the inner wall of the blood vessel, making it easier to guide the intravenous cannula 1 out of the blood vessel.

[0034] The tip of the venous cannula 1 is cone-shaped.

[0035] With the above technical solution, the guide core 11 can be inserted to straighten the support bar 6.

[0036] The intravenous cannula 1 is provided with a supporting steel wire section as a partition, and the supporting steel wire 8 is located inside the partition.

[0037] The above technical solution, through the design of the supporting steel wire, can enhance the expansion of the venous catheter, prevent twisting that could obstruct drainage, and ensure sufficient venous blood drainage.

[0038] The intravenous catheter is made of a material with good transparency and toughness.

[0039] The above technical solution makes the intravenous catheter less prone to twisting and flattening, and provides good flexibility.

[0040] The method of using this utility model is as follows: First, the intravenous cannula 1 is connected to the guide core 11 through the connector 10. The puncture needle is inserted into the blood vessel, and the guide wire is inserted into the blood vessel through the puncture needle. The puncture needle is then pulled out, and the intravenous cannula 1 is guided into the blood vessel through the guide wire. The guide core 11 and the guide wire are then pulled out, leaving the intravenous cannula 1 in the blood vessel. The matching connector 12 is then connected to the extracorporeal circulation tubing, and extracorporeal blood circulation is then performed. Because the support strip 6 is elastic, when it enters the blood vessel, the guide core 11 with a pointed cone head is used to connect with the venous cannula 1. Under the action of the guide core 11, the support strip 6 is straight. When the guide core 11 and the guide wire are pulled out, the support strip 6 will bulge under the action of elasticity, which will open up the inner wall of the blood vessel. Blood flows into the venous cannula 1 from the gap 7 of the support strip 6, the drainage hole 13 and the drainage hole 14. This effectively prevents the blood vessel wall from being affected by negative pressure drainage, which would make the blood outflow hole easily wrapped and blocked by the inner wall of the blood vessel, thus affecting the effect of venous drainage. When withdrawing, the guide core 11 with a round head is used to connect with the venous cannula 1. This allows the support part of the venous cannula to be closed and straightened. The round head guide core can avoid damaging the inner wall of the blood vessel and facilitate the withdrawal of the venous cannula 1 from the blood vessel.

[0041] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A cardiopulmonary bypass intravenous cannulation kit, characterized in that, The device includes a venous cannula (1), which has a hollow drainage cavity and is divided into a front section (2), a middle section (3) and a rear section (4). The diameter of the front section (2) is smaller than that of the rear section (4). The middle section (3) is a transition section in the shape of a cone. The front section (2) is provided with a support part (5), which is formed by several support strips (6). There is a gap (7) between each support strip (6). The middle of the end of the front section (2) is a drainage hole (13). The venous cannula (1) is provided with a support wire (8). The head of the rear section (4) is provided with threaded teeth (9). The venous cannula (1) is connected to the guide core (11) through a connector (10). The guide wire passes through the guide core (11) and guides the venous cannula (1) into the blood vessel.

2. The extracorporeal circulation intravenous cannulation kit according to claim 1, characterized in that, The support bar (6) is elastic. In its natural state, the support bar (6) is raised. When the guide core (11) is inserted, it is straightened under the traction of the guide core (11).

3. The extracorporeal circulation venous cannulation kit according to claim 1, characterized in that, The support part (5) is provided with two drainage holes at both the front and rear ends.

4. The extracorporeal circulation intravenous cannulation kit according to claim 1, characterized in that, The guide core (11) is hollow, and the hollow part can pass through the guide wire. The end of the guide core (11) is provided with a connector (10). One end of the connector (10) is sleeved with a venous catheter, and the other end of the connector is a connector.

5. The extracorporeal circulation venous cannulation kit according to claim 1, characterized in that, The guide (11) is cone-shaped when it enters the head of the blood vessel.

6. The extracorporeal circulation intravenous cannulation kit according to claim 1, characterized in that, The guide (11) is round-headed when it enters the head of the blood vessel.

7. The extracorporeal circulation venous cannulation kit according to claim 1, characterized in that, The head of the front section (2) of the intravenous cannula (1) is cone-shaped, and the guide core (11) must be inserted to pull the support bar (6) straight.

8. The extracorporeal circulation intravenous cannulation kit according to claim 1, characterized in that, The intravenous catheter (1) is provided with a supporting steel wire section as a partition, and the supporting steel wire (8) is located inside the partition.

9. The extracorporeal circulation intravenous cannulation kit according to claim 1, characterized in that, The intravenous catheter (1) is made of a material with good transparency and good toughness.

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