A thrombus interceptor

Abstract

This invention relates to the field of medical device technology, specifically disclosing a thrombus interceptor, comprising a support bladder and a connecting tube. The support bladder has a placement hole and multiple flow holes, the flow holes for blood flow, and the placement holes for accommodating a catheter. The support bladder can abut against the inner wall of a blood vessel after inflating. The connecting tube communicates with the support bladder and can be connected to an external machine to inflate or deflate the support bladder. Contrast agent can be filled into the support bladder. This solution, by using a thrombolytic catheter in conjunction with the interceptor, integrates thrombolysis, thrombectomy, and thrombus interception functions using ultrasound technology. This solves the problems of using metal filters for thrombus interception in existing technologies and enables timely treatment of thrombus patients even in remote areas with limited medical resources.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically a thrombus interceptor. Background Technology

[0002] In current medicine, thrombosis occurs in many blood vessels, including arterial and venous thrombosis. For common arterial and venous thrombosis in the limbs, surgical thrombectomy is highly invasive and has many postoperative complications. Therefore, interventional radiology is generally used in clinical practice. For veins, thrombectomy can be performed using aspiration or catheter-directed thrombolysis. Both methods require inserting a catheter into the blood vessel to aspirate the thrombus or inject medication to dissolve it. However, in both thrombolysis and thrombectomy, there is a possibility that the thrombus may detach from the vessel wall and move towards the proximal end of the bloodstream. As the thrombus increases in size, the blood vessel may become completely blocked, thus completely obstructing blood circulation and posing a great threat to life.

[0003] In existing technologies, to prevent thrombi from dislodging and blocking blood vessels during thrombolysis or thrombectomy, a metal filter is typically implanted into the blood vessel. This ensures that even if a thrombus at the thrombolysis site detaches from the vessel wall, it will be blocked by the metal filter, facilitating subsequent thrombolysis or thrombectomy using a catheter. However, the implantation of the metal filter requires interventional radiology, which involves intravenous injection of iodized contrast agent for angiography. On the one hand, some patients are allergic to the contrast agent; on the other hand, this method requires specialized large equipment and involves radiation, limiting its implementation and increasing the difficulty of thrombus treatment. Furthermore, after the metal filter is installed in the blood vessel, it can shift due to the impact of blood flow. Additionally, the outer edge of the metal filter abuts against the vessel wall. To reduce the probability or extent of displacement, the outer edge must be kept very close to the vessel wall, but this increases the probability of the metal filter perforating the blood vessel. Summary of the Invention

[0004] The present invention aims to provide a thrombus interceptor to solve the problems existing in the prior art of using metal filters to intercept thrombi.

[0005] To achieve the above objectives, the basic solution of the present invention is as follows:

[0006] A thrombus interceptor includes a support bladder and a connecting tube. The support bladder has a placement hole and multiple flow holes. The flow holes are for blood to flow through, and the placement holes are for accommodating a catheter. The support bladder can abut against the inner wall of a blood vessel after it is inflated. The connecting tube is connected to the support bladder and can be connected to an external machine to make the support bladder inflate or deflate. The support bladder can be filled with contrast agent.

[0007] Compared to existing technologies, the following benefits are achieved:

[0008] When this method is used to intercept thrombi, the guidewire and target tube used in the puncture and catheterization procedure are used. After the guidewire and target tube are inserted into the blood vessel, the deflated support balloon is accommodated in the target tube and the support balloon is placed on the guidewire. At this time, the guidewire is inserted into the placement hole of the support balloon. The support balloon moves along the guidewire until it reaches the target position. Then, the target tube is withdrawn, and the support balloon is placed in the blood vessel. Then, the machine connected to the connecting tube is activated, so that the support balloon can be injected with contrast agent and inflated. The outer wall of the inflated support balloon abuts against the inner wall of the blood vessel to form a fixed position of the support balloon in the blood vessel. At the same time, because the support balloon is connected to the connecting tube, one end of the connecting tube is exposed outside the patient's body and the other end is located in the blood vessel, making it extremely difficult for the support balloon connected to the connecting tube to move in the blood vessel. This ensures that the support balloon does not move in the blood vessel and avoids the problem of metal filter moving in the blood vessel in the prior art.

[0009] When using this method, after the outer wall of the support balloon is pressed against the inner wall of the blood vessel, the flow port on the support balloon also expands. By using existing ultrasound equipment, the combination of ultrasound and contrast agent is used to determine whether the flow port and placement port are fully expanded, to confirm that the flow port of the support balloon allows blood flow and can intercept and block thrombi. When thrombolysis or thrombectomy is required, the fully expanded placement port facilitates the placement of the catheter, which can then perform thrombectomy or thrombolysis on the thrombi intercepted by the support balloon. Therefore, this method integrates thrombolysis, thrombectomy, and thrombus interception, and has a wider range of applications. Especially in places with poor medical conditions, such as in the field, emergency sites, and large disaster sites, where it is not possible to implant metal filters for venous thrombosis under interventional radiological guidance, this interceptor can be used in conjunction with the thrombolysis catheter for integrated treatment. Both the catheter used for puncture and catheter placement and the ultrasound equipment used in conjunction are small in size and easy to carry. Therefore, this method can also facilitate timely treatment of thrombosis patients in places with poor medical conditions, such as in the field.

[0010] Furthermore, with this approach, the degree of bulging of the support capsule can be controlled. The support capsule is softer than a metal filter and has a larger contact area with the vessel wall. Therefore, the greater friction between the support capsule and the vessel wall makes it less prone to movement within the vessel, while also reducing pressure on the vessel wall. This significantly reduces the probability of the support capsule perforating the vessel compared to a metal filter. In addition, with this approach, the entire process, from the implantation of the interceptor to post-implantation monitoring, is performed under ultrasound guidance. The use of ultrasound for angiography ensures safety, and the absence of contrast agent injection into the vessel avoids potential patient allergies, thus improving the applicability of this interceptor.

[0011] Furthermore, the connecting tube is a double-layered tube with a hollow channel and an annular channel. The annular channel connects to the hollow channel, the hollow channel is connected to the placement hole, and the annular channel is connected to the internal cavity of the support bladder.

[0012] Beneficial effects: The design of the connecting tube in this scheme makes the overall structure of the device simpler and makes it easier to combine with existing puncture and catheterization techniques.

[0013] Furthermore, an auxiliary tube is provided at the end of the connecting tube away from the support bladder. The auxiliary tube is connected to the annular channel and is used to connect to a machine that inflates or deflates the support bladder.

[0014] Beneficial effects: This solution simplifies the structure of the interceptor and makes it easy to bulge or deflate the connecting tube using a machine.

[0015] Furthermore, the support bladder is provided with connecting ribs, which are spiral in shape and extend gradually from the center of the support bladder to the outer wall of the support bladder.

[0016] Beneficial effect: The spiral connecting ribs help keep the support capsule rolled up before blood vessels are inserted.

[0017] Furthermore, the number of connecting ribs is one, and the spiral connecting rib extends from the center of the support bladder to the outer wall of the support bladder in a vortex manner.

[0018] Beneficial effects: This structure allows for easy winding of the support bladder with only one connecting rib, improving the speed of winding the support bladder.

[0019] Furthermore, there are multiple connecting ribs, which are evenly distributed around the center of the support bladder.

[0020] Beneficial effects: When using this solution, the setting of multiple spiral connecting ribs facilitates the winding of the support bladder and enhances the support strength of the air bladder for blood vessels.

[0021] Furthermore, the end face of the support bladder away from the connecting tube is a convex curved surface or a conical surface.

[0022] Beneficial effects: When in use, the end of the support balloon furthest from the connecting tube is inserted into the blood vessel first. The outer curved or conical surface of the support balloon in this design helps to reduce friction during the insertion of the support balloon into the blood vessel (or the target tube). In addition, the outer curved or conical surface of the support balloon plays a guiding role for the intercepted thrombus. The intercepted thrombus will move towards the edge of the support balloon closer to the blood vessel wall, reducing the speed at which the thrombus completely blocks the flow hole on the support balloon.

[0023] Furthermore, the end of the support bladder away from the connecting pipe is provided with a protrusion, and an auxiliary net is connected between the protrusion and the outer wall of the support bladder.

[0024] Beneficial effects: When using this solution, the auxiliary mesh ensures that the thrombus first contacts and is intercepted, achieving primary thrombus interception. Thrombi that cannot be intercepted by the auxiliary mesh are then intercepted a second time by the support balloon. Through primary and secondary interception, the probability of the thrombus completely blocking the flow port of the support balloon is greatly reduced.

[0025] Furthermore, the auxiliary net includes several auxiliary wires, one end of which is connected to a protrusion and the other end of which is connected to the outer wall of the support bladder. The several auxiliary wires are evenly distributed along the circumference of the support bladder.

[0026] Beneficial effects: By setting up the auxiliary wire, the thrombus can be intercepted in one step, and the auxiliary net can be easily rolled up together with the support bag.

[0027] Furthermore, the outer wall of the support bladder is provided with several creases to facilitate the rolling up of the support bladder. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of Embodiment 1 of the present invention;

[0029] Figure 2 This is a longitudinal sectional view of Embodiment 1 of the present invention;

[0030] Figure 3 This is a cross-sectional view of Embodiment 2 of the present invention with 5 connecting ribs and the support bladder fully deployed;

[0031] Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention with 5 connecting ribs and the support bladder not fully deployed;

[0032] Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention with one connecting rib and the support bladder fully deployed.

[0033] Figure 6 This is a longitudinal sectional view of Embodiment 3 of the present invention;

[0034] Figure 7 This is a longitudinal sectional view of Embodiment 4 of the present invention;

[0035] Figure 8 for Figure 7 A schematic diagram of the left-side connection between the central support bladder and the auxiliary net. Detailed Implementation

[0036] The following detailed description illustrates the specific implementation method:

[0037] The reference numerals in the accompanying drawings include: support bladder 1, connecting tube 2, placement hole 3, flow hole 4, hollow channel 5, annular channel 6, auxiliary tube 7, connecting rib 8, auxiliary wire 9, protrusion 10, and conduit 100.

[0038] Example 1

[0039] Example 1 is basically as shown in the appendix. Figure 1 and Figure 2 As shown: A thrombus interceptor includes a support bladder 1 and a connecting tube 2 fixedly connected to the right side of the support bladder 1. The support bladder 1 has an integrally formed placement hole 3 and multiple flow holes 4. The outer contour of the cross-section of the support bladder 1 is circular. The placement hole 3 is located at the center of the support bladder 1, and the flow holes 4 are circumferential to the placement hole 3. The flow holes 4 are used for blood flow, and the placement hole 3 is used to accommodate a catheter 100 or a guidewire. The support bladder 1 can abut against the inner wall of the blood vessel after it is inflated. The connecting tube is connected to the support bladder 1 and can be connected to an external machine to make the support bladder 1 inflate or deflate. The support bladder 1 can be filled with a contrast agent. In this embodiment, the contrast agent used is an ultrasound contrast agent.

[0040] The connecting tube 2 is a double-layered tube, with a hollow channel 5 and an annular channel 6 integrally formed on it. The annular channel 6 connects to the hollow channel 5, and the hollow channel 5 communicates with the placement hole 3. The annular channel 6 communicates with the internal cavity of the support bladder 1. An auxiliary tube 7 is integrally formed on the right end of the connecting tube 2. The auxiliary tube 7 communicates with the annular channel 6 and is used to connect to a machine that inflates or deflates the support bladder 1.

[0041] The specific implementation process is as follows:

[0042] In this embodiment, when thrombus interception is required, the guidewire and target tube used in the puncture and catheterization procedure are used. After the guidewire and target tube are inserted into the blood vessel, the deflated support balloon 1 is accommodated in the target tube and the support balloon 1 is placed on the guidewire. At this time, the guidewire is inserted into the placement hole 3 of the support balloon 1. The support balloon 1 moves along the guidewire until it reaches the target position. Then, the target tube is withdrawn, and the support balloon 1 is placed in the blood vessel. Then, the machine connected to the auxiliary tube 7 is activated, so that the contrast agent enters the support balloon 1 through the annular channel 6 of the connecting tube 2 and forces the support balloon 1 to inflate. The outer wall of the inflated support balloon 1 abuts against the inner wall of the blood vessel to form a fixed position of the support balloon 1 in the blood vessel. At the same time, because the support balloon 1 is connected to the connecting tube 2, and one end of the connecting tube 2 is exposed outside the patient's body while the other end is located inside the blood vessel, it also makes the movement of the support balloon 1 connected to the connecting tube in the blood vessel extremely difficult, thereby ensuring that the support balloon 1 will not move in the blood vessel.

[0043] In this embodiment, after the outer wall of the support balloon 1 is pressed against the inner wall of the blood vessel, the flow hole 4 on the support balloon 1 also expands. Using existing ultrasound equipment, the combination of ultrasound and contrast agent is used to determine whether the flow hole 4 and placement hole 3 are fully expanded, confirming that the flow hole 4 of the support balloon 1 allows blood flow and can intercept and block thrombi. When thrombolysis or thrombectomy is required, the fully expanded placement hole 3 facilitates the placement of the catheter 100, allowing the catheter 100 to perform thrombectomy or thrombolysis on thrombi intercepted by the support balloon 1. Therefore, this embodiment... The solution integrates thrombolysis, thrombectomy, and thrombus interception, making it applicable to a wider range of scenarios. In particular, it is useful in situations where medical conditions are limited, such as in the field, emergency sites, or large disaster sites, where it is impossible to perform interventional radiology-guided venous thrombosis with metal filters. This interceptor can be combined with the thrombolysis catheter 100 for integrated treatment. Both the catheter 100 used for puncture and catheterization and the ultrasound equipment used in conjunction with it are small in size and easy to carry. Therefore, this solution can also facilitate timely treatment of thrombosis patients in situations with limited medical conditions, such as in the field.

[0044] Furthermore, in this embodiment, the degree of bulging of the support capsule 1 can be controlled, and the support capsule 1 is softer in structure than the metal filter, with a larger contact area with the inner wall of the blood vessel. Therefore, the support capsule 1 has greater friction with the inner wall of the blood vessel, making it less likely to move within the blood vessel, while also reducing the pressure of the support capsule 1 on the inner wall of the blood vessel. Thus, compared with the metal filter, it can greatly reduce the probability of the support capsule 1 perforating the blood vessel. In addition, in this embodiment, the entire process, whether it is the interceptor implantation process or the monitoring process after implantation, is operated under ultrasound guidance. The safety of using ultrasound to achieve angiography is ensured, and the entire process does not require the injection of contrast agent into the blood vessel, thus avoiding the patient allergy problem caused by it, and improving the applicability of this interceptor.

[0045] When performing thrombolysis or thrombectomy using this embodiment, the catheter 100 is inserted through the placement hole 3, and then the catheter 100 is used to perform thrombolysis or thrombectomy. The length of the catheter 100 inserted into the patient's body is not limited by the length and position of the support balloon 1, so that the support balloon 1 only needs to be placed at the proximal end of the patient, while the catheter 100 can be inserted at the distal end to perform thrombolysis or thrombectomy on the thrombus generated at the distal end, which greatly shortens the length of the support balloon 1 and reduces the difficulty of placing the support balloon 1.

[0046] Example 2

[0047] Example 2 is basically as shown in the attached document. Figures 3 to 5 As shown, Embodiment 2 is an improvement on Embodiment 1 as follows: a connecting rib 8 is formed inside the support bladder 1. The connecting rib 8 is spiral-shaped and extends gradually from the center of the support bladder 1 towards the outer wall of the support bladder 1; combined with Figure 3 and Figure 4When there are multiple connecting ribs 8, this embodiment takes 5 as an example, with the multiple connecting ribs 8 evenly distributed around the center of the support bladder 1. Combined with... Figure 5 When there is only one connecting rib 8, the spiral connecting rib 8 extends from the center of the support bladder 1 to the outer wall of the support bladder 1 in a spiral manner; the outer wall of the support bladder 1 has several creases that facilitate the rolling up of the support bladder 1.

[0048] The specific implementation process is as follows: When using this embodiment, the spiral connecting rib 8 facilitates the winding of the support bladder 1 before the target tube is inserted, and also facilitates the gradual unfolding of the support bladder 1 in the blood vessel; in addition, the presence of the connecting rib 8 also enhances the overall support strength of the support bladder 1.

[0049] Example 3

[0050] Example 3 is basically as shown in the appendix. Figure 6 As shown, Embodiment 3 improves upon Embodiment 2 as follows: the end face of the support bladder 1 furthest from the connecting tube is a convex curved surface or a conical surface. (The attached image of this embodiment is missing from the original text.) Figure 6 Take a convex curved surface as an example.

[0051] In this embodiment, the support bladder 1 is positioned away from the end of the connecting tube (i.e., the end attached). Figure 6 The left end of the support balloon 1 is inserted into the blood vessel first. The outer curved or conical surface of this end is conducive to reducing friction during the insertion of the support balloon 1 into the blood vessel (or into the target tube). In addition, the outer curved or conical surface of the support balloon 1 plays a guiding role for the intercepted thrombus. The intercepted thrombus will move towards the edge of the support balloon 1 near the blood vessel wall, reducing the speed at which the thrombus completely blocks the flow hole 4 on the support balloon 1.

[0052] Example 4

[0053] Example 4 is basically as shown in the appendix. Figure 7 and Figure 8 As shown, Embodiment 4 is an improvement on Embodiment 3 as follows: A protrusion 10 (i.e., ...) is provided at the end of the support bladder 1 furthest from the connecting tube. Figure 7 (At the left end), an auxiliary net is connected between the protrusion 10 and the outer wall of the support bladder 1. The auxiliary net includes several auxiliary wires 9. One end of the auxiliary wire 9 is connected to the protrusion 10, and the other end of the auxiliary wire 9 is connected to the outer wall of the support bladder 1. Several auxiliary wires 9 are evenly distributed around the support bladder 1. In this embodiment, the auxiliary wires 9 can be made of the same material as the catheter 100.

[0054] In this embodiment, by setting up an auxiliary net, the thrombus first comes into contact with the auxiliary net and is intercepted by the auxiliary net, thus achieving primary interception of the thrombus; the thrombus that cannot be intercepted by the auxiliary net will be intercepted a second time by the support bladder 1. Through primary and secondary interception, the probability of the thrombus completely blocking the flow hole 4 of the support bladder 1 is greatly reduced.

[0055] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A thrombus interceptor, characterized in that: It includes a support balloon and a connecting tube. The support balloon has a placement hole and multiple flow holes. The diameter of the flow holes is smaller than the minimum cross-section of the thrombus. The flow holes are used for blood flow, and the placement holes are used to accommodate the catheter. The support balloon can abut against the inner wall of the blood vessel after it is inflated. The connecting tube is connected to the support balloon and can be connected to an external machine to make the support balloon inflate or deflate. Contrast agent can be filled into the support balloon. The support bladder has a protrusion at the end away from the connecting tube. An auxiliary net is connected between the protrusion and the outer wall of the support bladder. The auxiliary net includes several auxiliary wires. One end of the auxiliary wire is connected to the protrusion, and the other end of the auxiliary wire is connected to the outer wall of the support bladder. The several auxiliary wires are evenly distributed around the circumference of the support bladder. The connecting tube is a double-layered tube with a hollow channel and an annular channel. The annular channel connects to the hollow channel, the hollow channel is connected to the placement hole, and the annular channel is connected to the internal cavity of the support bladder.

2. The thrombus interceptor according to claim 1, characterized in that: An auxiliary tube is provided at the end of the connecting tube away from the support bladder. The auxiliary tube is connected to the annular channel and is used to connect to a machine that inflates or deflates the support bladder.

3. The thrombus interceptor according to claim 1, characterized in that: The support bladder is provided with connecting ribs, which are spiral in shape and extend gradually from the center of the support bladder to the outer wall of the support bladder.

4. The thrombus interceptor according to claim 3, characterized in that: The number of connecting ribs is one, and the spiral connecting ribs extend from the center of the support bladder to the outer wall of the support bladder in a vortex manner.

5. The thrombus interceptor according to claim 3, characterized in that: There are multiple connecting ribs, which are evenly distributed around the center of the support bladder.

6. The thrombus interceptor according to claim 3, characterized in that: The end face of the support bladder away from the connecting tube is a convex curved surface or a conical surface.

7. The thrombus interceptor according to claim 3, characterized in that: The outer wall of the support bladder has several creases to facilitate the rolling up of the support bladder.

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