Thrombus filter with filter element convenient to replace

Abstract

The utility model relates to the technical field of thrombus filtration, in particular to a thrombus filter with a filter element convenient to replace, and adopts the technical scheme that the thrombus filter comprises a filter tube and an inferior vena cava, a gripper is fixedly mounted at one end of the filter tube, and the tail end of the gripper can expand outwards and is supported on the inner wall of the inferior vena cava; the thrombus filter is characterized in that rhombic holes are formed in the surfaces of the filter tube and the gripper, a recycling hook head is arranged at the end, away from the gripper, of the filter tube, and the filter tube, the gripper and the recycling hook head form a thrombus filter body. The folded new thrombus filter penetrates through the front side of the old thrombus filter on the inner wall of the inferior vena cava through a special medical assembly, and the old thrombus filter is folded and recycled while the new thrombus filter is unfolded, so that the folded new thrombus filter is folded, and the folded new thrombus filter is folded and recycled. The effects of simplifying the replacement steps, shortening the replacement period and improving the replacement efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of thrombus filtering, in particular to a thrombus filter with a filter element that is easy to replace. Background Art

[0002] A thrombus filter is a medical device used to prevent and treat venous thromboembolism (DVT) and pulmonary embolism. This filter is usually used during surgery or other situations when the patient is at risk of thrombosis. The thrombus filter is implanted in the body, usually placed in the inferior vena cava or femoral vein, to intercept thrombi and emboli in the blood and prevent them from entering the lungs from the venous system of the lower limbs and causing pulmonary embolism. This filter is designed with a mesh structure that can intercept thrombi and prevent them from continuing to move to the heart or lungs.

[0003] The existing technology has the following deficiencies: traditional thrombus filters need to be replaced regularly during long-term use. The doctor will evaluate the status of the filter according to the specific situation and arrange a replacement operation when necessary. Since implanting a thrombus filter and removing a thrombus filter are essentially two different operations, the medical devices used in the operation and the surgical objectives to be achieved are very different. If you want to complete the filter replacement in one operation, you need to remove the old filter first and then implant a new filter, and insert guide wires, delivery sheaths and other medical devices into the patient's inferior vena cava multiple times. If the medical device stays in the patient's inferior vena cava for too long, it is not only easy to cause harm to the patient's body, but the long operation is also likely to cause huge physical consumption of the doctor. Therefore, the traditional thrombus filter has the problems of cumbersome replacement procedures, long replacement cycle and low replacement efficiency.

[0004] Therefore, it is necessary to invent a thrombus filter that is easy to replace the filter element. Utility Model Content

[0005] To this end, the utility model provides a thrombus filter that is easy to replace the filter element. Diamond-shaped openings are set on the filter tube and the gripper surface of the thrombus filter, so that the filter tube and the gripper can pass through the filter tube and the inner wall of the gripper in the unfolded state after being shrunk and folded, and then the new thrombus filter in the folded state is passed through the front side of the old thrombus filter on the inner wall of the inferior vena cava through a special medical component, and the old thrombus filter is folded and recovered while the new thrombus filter is unfolded, so as to solve the problem that in the traditional thrombus filter replacement process, it is necessary to insert medical devices such as guide wires and delivery sheaths into the patient's inferior vena cava many times, resulting in cumbersome replacement steps, long replacement cycle and low replacement efficiency. The medical device stays in the patient's inferior vena cava for too long, which is not only easy to cause harm to the patient's body, but also easy to cause huge physical consumption of the doctor during the long operation.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thrombus filter that is easy to replace the filter element, comprising a filter tube and an inferior vena cava, the outer wall of the filter tube is evenly provided with hollow diamond-shaped openings, a gripper is fixedly installed at one end of the filter tube, and the surface of the gripper is also provided with hollow diamond-shaped openings, the end of the gripper can expand outward and support on the inner wall of the inferior vena cava, and a recovery hook is provided at the end of the filter tube away from the gripper, and the filter tube, the gripper and the recovery hook constitute the thrombus filter body, and the thrombus filter body needs to be implanted and recovered in the inferior vena cava through a special medical component.

[0007] Preferably, the medical component includes a guide wire, which can be inserted into the opening of the patient's neck vein along the patient's neck vein and extend into the inferior vena cava. The guide wire can be inserted into the inner wall of the inferior vena cava on one side of the filter tube where a recovery hook is provided.

[0008] Preferably, the medical component includes a delivery sheath having an opening at one end and a delivery catheter fixedly connected at the other end. A folded filter element is inserted into and installed on the inner wall of the delivery sheath. The folded filter element is a folded state of the thrombus filter body composed of a filter tube, a gripper and a recovery hook.

[0009] Preferably, the medical component includes a recovery sheath core, which is sleeved and installed on the outer wall of the delivery sheath and the outer side of the delivery catheter, and the recovery sheath is sleeved and installed on the outer wall of the recovery sheath core.

[0010] Preferably, the medical component includes a capture guidewire, the inner wall of the recovery sheath core is provided with a groove, the capture guidewire is slidably embedded in the groove of the inner wall of the recovery sheath core, one end of the capture guidewire extends out of the capture guidewire inner wall, and the end of the capture guidewire extending out of the capture guidewire inner wall is fixedly installed with a capture ring.

[0011] Preferably, the delivery sheath and the delivery catheter can be sleeved on the outside of the guide wire, and the folded filter element in the delivery sheath is also sleeved on the outside of the guide wire. The delivery sheath and the delivery catheter can extend along the guide wire into the inferior vena cava.

[0012] The beneficial effects of the utility model are as follows: by arranging diamond-shaped openings on the filter tube and the surface of the gripper of the thrombus filter, the filter tube and the gripper can pass through the inner wall of the filter tube and the gripper in the unfolded state after being shrunk and folded, and then through a special medical component, the new thrombus filter in the folded state is passed through the front side of the old thrombus filter on the inner wall of the inferior vena cava, and the old thrombus filter is folded and recovered while the new thrombus filter is unfolded, so as to simplify the replacement steps, shorten the replacement cycle, and improve the replacement efficiency, avoid the burden on the patient's body caused by the medical device staying in the patient's inferior vena cava for too long, and reduce the physical exertion of the doctor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a thrombus filter body that is easy to replace the filter element provided by the utility model;

[0014] Figure 2 A schematic diagram of the medical component structure of a thrombus filter that is easy to replace the filter element provided by the utility model;

[0015] Figure 3 A cross-sectional view of a delivery sheath of a thrombus filter that is convenient for replacing the filter element provided by the utility model;

[0016] Figure 4 A schematic diagram of a guide wire introduction for a thrombus filter that facilitates filter element replacement provided by the utility model;

[0017] Figure 5 A schematic diagram of a capture ring of a thrombus filter for easy replacement of a filter element provided by the utility model;

[0018] Figure 6 A schematic diagram of the extension of a recovery sheath of a thrombus filter for easy replacement of a filter element provided by the utility model;

[0019] Figure 7 A schematic diagram of a delivery sheath of a thrombus filter for easy filter element replacement provided by the utility model passing through an old thrombus filter.

[0020] In the figure: filter tube 11, gripper 12, recovery hook head 13, guide wire 21, delivery sheath 22, delivery catheter 23, recovery sheath core 24, recovery sheath 25, capture guide wire 26, capture ring 27, folded filter element 3, inferior vena cava 4. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0022] Example 1

[0023] like Figure 1 and Figure 4 As shown, a thrombus filter for easy replacement of filter elements in the embodiment of the first aspect of the utility model comprises a filter tube 11 and an inferior vena cava 4, the outer wall of the filter tube 11 is evenly provided with hollow diamond-shaped openings, a gripper 12 is fixedly installed at one end of the filter tube 11, and the surface of the gripper 12 is also provided with hollow diamond-shaped openings, the end of the gripper 12 can expand outward and be supported on the inner wall of the inferior vena cava 4, and a recovery hook 13 is provided at the end of the filter tube 11 away from the gripper 12, and the filter tube 11, the gripper 12 and the recovery hook 13 constitute a thrombus filter body, and the thrombus filter body needs to be implanted and recovered in the inferior vena cava 4 through a special medical component.

[0024] In the above embodiment, it should be noted that the filter tube 11, the gripper 12 and the recovery hook 13 are all made of nickel-titanium alloy. The nickel-titanium alloy has shape memory properties and can restore to its original shape after being deformed in the body. The filter tube 11, the gripper 12 and the recovery hook 13 can shrink and fold into a thin tube. The filter tube 11 and the gripper 12 can intercept the thrombus flowing in the inferior vena cava 4. By setting diamond openings on the surface of the filter tube 11 and the gripper 12, the filter tube 11 and the gripper 12 can pass through the inner wall of the filter tube 11 and the gripper 12 in the unfolded state after shrinkage and folding. Then, through a special medical component, the new thrombus filter in the folded state is passed through the front side of the old thrombus filter on the inner wall of the inferior vena cava 4, and the old thrombus filter is folded and recovered while the new thrombus filter is unfolded, so as to simplify the replacement steps, shorten the replacement cycle, and improve the replacement efficiency, avoid the burden on the patient's body caused by the medical device staying in the patient's inferior vena cava for too long, and reduce the physical exertion of the doctor.

[0025] Example 2

[0026] like Figure 1-Figure 7 As shown, a thrombus filter that is easy to replace the filter element includes all the contents of Example 1. In addition, the medical component includes a guide wire 21. At the opening of the patient's neck vein, the guide wire 21 can be inserted along the patient's neck vein and extend into the inferior vena cava 4. The guide wire 21 can be inserted into the inner wall of the inferior vena cava 4 on the side of the filter tube 11 where a recovery hook head 13 is provided. The medical component includes a delivery sheath 22. One end of the delivery sheath 22 is provided with an opening, and the other end is fixedly connected to a delivery catheter 23. A folded filter element 3 is inserted into the inner wall of the delivery sheath 22. The folded filter element 3 is a folded state of the thrombus filter body composed of the filter tube 11, the gripper 12 and the recovery hook head 13. The medical component includes a recovery sheath core 24. The recovery hook head 13 is provided on the inner wall of the inferior vena cava 4. The sheath collection core 24 is sleeved and installed on the outer wall of the delivery sheath 22 and the outer side of the delivery catheter 23. The recovery sheath core 24 is sleeved and installed with a recovery sheath 25 on the outer wall. The medical component includes a capture guide wire 26. The inner wall of the recovery sheath core 24 is provided with a groove. The capture guide wire 26 is slidably embedded in the groove of the inner wall of the recovery sheath core 24. One end of the capture guide wire 26 extends out of the inner wall of the capture guide wire 26. The end of the capture guide wire 26 extending out of the inner wall of the capture guide wire 26 is fixedly installed with a capture ring 27. The delivery sheath 22 and the delivery catheter 23 can be sleeved on the outside of the guide wire 21. At the same time, the folded filter element 3 in the delivery sheath 22 is also sleeved on the outside of the guide wire 21. The delivery sheath 22 and the delivery catheter 23 can extend along the guide wire 21 to the inferior vena cava 4.

[0027] In the above embodiment, it should be noted that the guide wire 21 is made of polyurethane. The polyurethane guide wire has good elasticity and softness, which can reduce the stimulation to the blood vessel wall. The delivery sheath 22, the delivery catheter 23, the recovery sheath core 24, and the recovery sheath 25 are all made of polyurethane. The polyurethane catheter has good softness and elasticity, can adapt to the bending and twisting of the blood vessel, and reduce the damage to the blood vessel wall. The capture guide wire is made of stainless steel and has good strength and rigidity. The capture ring 27 adopts the design of inner nickel-titanium memory alloy and outer black gold coil.

[0028] The replacement process of the new thrombus filter provided by the utility model is as follows: in the initial state, the end of the gripper 12 expands outward and supports the inner wall of the inferior vena cava 4, stabilizing the filter tube 11 on the inner wall of the inferior vena cava 4, and the filter tube 11 and the gripper 12 intercept the thrombus blocks flowing in the inferior vena cava 4. When it is necessary to replace the old thrombus filter composed of the filter tube 11, the gripper 12 and the recovery hook head 13 in the inferior vena cava 4, it is necessary to first open the patient's neck vein, insert the guide wire 21 into the patient's neck vein and extend it to the inferior vena cava 4 close to the old thrombus filter, insert the folded filter element 3 into the delivery sheath 22, and extend the delivery sheath 22 and the delivery catheter 23 along the guide wire 21 into the inferior vena cava 4. The delivery sheath 22 and the delivery catheter 23 drive the recovery sheath core 24 and the recovery sheath 25 of the outer wall to extend into the vena cava 4, and then pull out the guide wire 21, push the capture guide wire 26 to drive the capture ring 27 close to the filter tube 11 and hook the recovery hook head 13, then push the recovery sheath core 24 close to the filter tube 11 and sleeve on the outer wall of the filter tube 11, then push the delivery catheter 23, the delivery catheter 23 pushes the delivery sheath 22 to pass through the inner wall of the filter tube 11 and extend to the inner wall of the inferior vena cava 4 at the front end of the gripper 12, then push the recovery sheath 25, the recovery sheath 25 slides along the outer wall of the recovery sheath core 24 toward the gripper 12, and gradually sleeves on the outer wall of the gripper 12, the paper folds the gripper 12 and stores it in the inner wall of the recovery sheath 25 and the outer wall of the delivery catheter 23, finally pull the delivery catheter 23, the delivery catheter 23 drives the delivery sheath 22 to be recovered, the folded filter element 3 in the delivery sheath 22 escapes from the delivery sheath 22 and unfolds into a new thrombus filter supported on the inner wall of the afferent vena cava 4, finally pull the delivery catheter 23 and the delivery sheath 22 to drive the recovery sheath core 24, the recovery sheath 25 and the old thrombus filter out of the patient's body, and the replacement of the thrombus filter is completed.

[0029] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A thrombus filter with an easily replaceable filter element, comprising a filter tube (11) and an inferior vena cava (4), characterized in that: The outer wall of the filter tube (11) is evenly provided with hollow diamond-shaped openings, a gripper (12) is fixedly mounted on one end of the filter tube (11), and the surface of the gripper (12) is also provided with hollow diamond-shaped openings, the end of the gripper (12) can expand outward and be supported on the inner wall of the inferior vena cava (4), and a recovery hook (13) is provided at one end of the filter tube (11) away from the gripper (12), and the filter tube (11), the gripper (12) and the recovery hook (13) constitute a thrombus filter body, and the thrombus filter body needs to be implanted and recovered in the inferior vena cava (4) through a special medical component.

2. The thrombus filter with easy filter element replacement according to claim 1, characterized in that: The medical component comprises a guide wire (21), which can be inserted into the opening of the patient's neck vein along the patient's neck vein and extend into the inferior vena cava (4), and the guide wire (21) can be inserted into the inner wall of the inferior vena cava (4) on the side of the filter tube (11) where a recovery hook (13) is provided.

3. The thrombus filter with easy filter element replacement according to claim 2, characterized in that: The medical component comprises a delivery sheath (22), one end of which is provided with an opening, and the other end of which is fixedly connected to a delivery catheter (23), a folded filter element (3) is inserted and installed on the inner wall of the delivery sheath (22), and the folded filter element (3) is a folded state of a thrombus filter body composed of a filter tube (11), a gripper (12) and a recovery hook (13).

4. The thrombus filter with easy filter element replacement according to claim 3, characterized in that: The medical component comprises a recovery sheath core (24), wherein the recovery sheath core (24) is sleeved and installed on the outer wall of the delivery sheath (22) and the outer side of the delivery catheter (23), and the recovery sheath (25) is sleeved and installed on the outer wall of the recovery sheath core (24).

5. The thrombus filter with easy filter element replacement according to claim 4, characterized in that: The medical component comprises a capture guide wire (26), the inner wall of the recovery sheath core (24) is provided with a groove, the capture guide wire (26) is slidably embedded in the groove of the inner wall of the recovery sheath core (24), one end of the capture guide wire (26) extends out of the inner wall of the capture guide wire (26), and the end of the capture guide wire (26) extending out of the inner wall of the capture guide wire (26) is fixedly installed with a capture ring (27).

6. The thrombus filter with easy filter element replacement according to claim 5, characterized in that: The delivery sheath (22) and the delivery catheter (23) can be sleeved on the outside of the guide wire (21), and the folded filter element (3) in the delivery sheath (22) is also sleeved on the outside of the guide wire (21). The delivery sheath (22) and the delivery catheter (23) can extend along the guide wire (21) into the inferior vena cava (4).

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