Filter recovery device based on double-core pincer tube

Abstract

The application discloses a filter recovery device based on a double-core forceps-shaped tube and belongs to the field of medical instruments and equipment, which comprises a recovery long sheath catheter, a double-core forceps-shaped tube arranged in the recovery long sheath catheter and a soft guide wire arranged in the double-core forceps-shaped tube, wherein the double-core forceps-shaped tube comprises two soft catheters fixed together in parallel, namely a forceps-shaped tube A and a forceps-shaped tube B, the head portions of the forceps-shaped tube A and the forceps-shaped tube B are separated from each other, at least one of the head portions is bent away from the other, and the end portions of the forceps-shaped tube A and the forceps-shaped tube B are buckled to each other so that the head portions of the double-core forceps-shaped tube become forceps-shaped. The application has novel design and ingenious concept, effectively reduces the difficulty of recovery of a vena cava filter, improves the success rate of recovery, and is suitable for filters in various difficulty levels and various implantation states, and has remarkable effect.

Description

Technical Field

[0001] This invention relates to the field of medical devices and equipment, and more particularly to surgical consumables, specifically a recovery device for performing surgery to remove a vena cava filter. Background Technology

[0002] Venous thromboembolism (VTE) refers to the condition of blood clots and plaques forming in veins. Depending on its stage and location, it presents in two main clinical forms: pulmonary embolism (PE), primarily characterized by pulmonary thromboembolism (PTE), and deep vein thrombosis (DVT). Because VTE can be caused by prolonged bed rest with plaster casts or stents, surgical or bed-related damage to the venous wall, and drug-induced thrombotic tendencies (i.e., hypercoagulability), it frequently becomes a postoperative complication in hospital settings. Its onset is insidious, with few or no obvious clinical symptoms, making it easily misdiagnosed or missed. Once it occurs, it has a high mortality and disability rate. To prevent further harm from venous thrombosis, a vena cava filter is usually placed in the patient's vein. A vena cava filter is a cage-like stent constructed of metal wire, with a retrieval hook at one end. Supported in the patient's vein, it blocks thrombi as they flow through and breaks them down under the flushing action of the bloodstream. This prevents thrombi from obstructing blood flow to vital organs such as the lungs and cardiovascular system. The placement of a vena cava filter significantly reduces the risk of venous thrombosis (VTE). After the risk of thrombosis is reduced, filter removal can be considered. Removal is performed using a grasper with a ring-shaped tip. The tip is looped around the filter's retrieval hook, and the filter is then pulled into a long sheath catheter for retrieval.

[0003] Vein filters are placed and released through interventional surgery. The surgery is relatively difficult, the field of vision is not very intuitive, and the operation is not very convenient. Therefore, after the filter is placed, it may be difficult to retrieve due to various reasons, or even require surgical removal by major surgery, which brings great trouble to both the surgeon and the patient.

[0004] A common reason for filter retrieval difficulties is tilted placement of the filter or the filter retrieval hook being too close to the vessel wall. While the hook's proximity to the wall doesn't affect its ability to prevent thrombus buildup, it makes it difficult for the catcher to lock onto the hook during retrieval, leading to retrieval failure. Current methods often involve modifying the guidewire for loop-like filter removal. Specifically, this involves cutting a double-J catheter (pigtail catheter), bending the loop at the tip into a U-shape, allowing the guidewire to pass through the filter and then bend back, before grabbing the guidewire to create a loop. However, this modified approach still has significant problems. Firstly, the extended guidewire shouldn't be too long; too long, and it becomes difficult to bend back and grab. It also shouldn't be too long, as it's prone to slipping off the catcher tip during retrieval, making locking difficult. Secondly, the guidewire rarely passes through the middle of the filter, typically only able to loop around one or two legs. After locking the filter from the side, it's difficult to pull the retrieval hook into the retrieval sheath, again causing retrieval failure.

[0005] Therefore, clinicians still need an excellent retrieval device to deal with the unusual placement of vena cava filters that may be encountered during vena cava filter retrieval surgery. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a filter retrieval device based on a dual-core clamp tube, which can effectively assist surgeons in retrieving vena cava filters.

[0007] The technical problem to be solved by the present invention is achieved through the following technical means:

[0008] The filter recovery device based on the dual-core clamp tube includes a recovery long sheath tube, a dual-core clamp tube inserted inside the recovery long sheath tube, and a soft guide wire inserted inside the dual-core clamp tube. The dual-core clamp tube includes two soft guide tubes fixedly arranged side by side, namely clamp tube A and clamp tube B. The heads of clamp tube A and clamp tube B are separated from each other, with at least one head bent away from the other, and the two bend towards each other at the ends. The ends of clamp tube A and clamp tube B are fastened together so that the head of the dual-core clamp tube becomes clamp-shaped.

[0009] In this invention, the end opening of the clamp-shaped tube A is configured as a pointed constriction, and the end opening of the clamp-shaped tube B is configured as a flared opening that fits into the end opening of the clamp-shaped tube A.

[0010] Furthermore, the head of the dual-core clamp tube is inclined, with an angle of 45° between it and the body of the dual-core clamp tube, and the inclination direction is perpendicular to the plane where clamp tube A and clamp tube B are located.

[0011] Furthermore, the head of the recovered long sheath catheter is tilted, and the end face opening is configured as a beveled opening.

[0012] Furthermore, when the heads of the dual-core clamp tubes are separated, the pointed constriction of clamp tube A is 2mm long, the flared opening of clamp tube B is 2mm long, and the ends of clamp tube A and clamp tube B are 6mm apart. When the heads of the dual-core clamp tubes are fastened together, the head is 2cm long and 1cm wide, the head of the retrieval long sheath catheter is 3cm long, the angle between the head and the main body of the retrieval long sheath catheter is 30°, and the oblique cutting angle of the end face is 30°.

[0013] In this invention, the tails of the clamp-shaped tube A and clamp-shaped tube B are separated from each other, which facilitates operation.

[0014] In this invention, the tail end of the dual-core clamp tube is provided with a tail end sealing cap to seal the tail ends of clamp tube A and clamp tube B to prevent blood leakage during operation. The tail end of the dual-core clamp tube is provided with a guide wire rotary resistor to connect the two ends of the soft guide wire. This is used to keep the guide wire and the dual-core clamp tube relatively fixed after the filter is locked, so as to prevent the filter from slipping off during the recycling process.

[0015] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0016] (1) The present invention utilizes the combination of the head end of the double-core clamp tube and the soft guide wire to directly construct a separable LOOP ring at the head of the double-core clamp tube, which simplifies the operation of using the LOOP ring to capture the filter retrieval hook or the filter body, effectively reducing the difficulty of the operation, shortening the operation time, and further reducing the harm of the interventional surgery for retrieval of the filter to the surgeon and the patient.

[0017] (2) The head end of the dual-core clamp tube of the present invention has a separable clamp structure, which can capture the filter recovery hook and the filter body, making the success rate of filter recovery operation high, avoiding the need for major surgery due to failure of recovery, and effectively improving the postoperative quality of life of patients.

[0018] (3) The double-core clamp tube used in this invention includes clamp tube A and clamp tube B fixed in parallel. The ends of the two are respectively set as a pointed constriction and a flared mouth that can be fastened together, which makes it easy to fasten and reduces the difficulty of operation.

[0019] (4) The double-core clamp tube used in this invention has an inclined head setting, which can effectively deal with filters in various insertion states. Even when facing filters with the recycling hook attached to the wall, it can effectively fasten to the middle position of the filter, reducing the difficulty of operation and improving the recycling success rate.

[0020] (5) The head of the recovery long sheath catheter of the present invention is tilted and cooperates with the tilted head of the double-core clamp tube. By rotating the double-core clamp tube, its head can cope with more filters in the straight-in state, which effectively improves the recovery success rate.

[0021] (6) The end of the recovery long sheath conduit of the present invention is set as a bevel, which can effectively prevent the recovery hook from blocking the port of the recovery long sheath conduit when the double-core clamp tube locks the filter for recovery. By rotating, the filter can be properly pulled into the recovery long sheath conduit, which effectively reduces the difficulty of filter recovery and improves the efficiency of filter recovery.

[0022] Therefore, this invention is novel in design and ingenious in conception, effectively reducing the difficulty of retrieval of vena cava filters and improving the success rate of retrieval. At the same time, it can adapt to filters of various difficulty and insertion states, with remarkable effects. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the double-core clamp tube in the locking state of the present invention;

[0025] Figure 3 for Figure 1 Side view of a double-core clamp tube;

[0026] Figure 4 for Figure 1 Side view of the recovery long sheath catheter in the middle;

[0027] Figure 5 A diagram illustrating the state of the LOOP loop for grasping and retrieving the vena cava filter using the dual-core clamp-shaped tube of this invention.

[0028] Figure 6 This is a state diagram of the dual-core clamp-shaped tube clamping and grasping vena cava filter body of the present invention.

[0029] In the diagram: 1. Retrieval long sheath catheter; 2. Clamping tube A; 3. Clamping tube B; 4. Pointed constriction; 5. Trumpet mouth; 6. Soft guidewire; 7. Filter; 8. Retrieval hook. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0031] Example 1

[0032] Filter recovery devices based on dual-core clamp tubes, such as Figure 1As shown, the device includes a retrieval long sheath catheter 1, a double-core clamp tube, and a soft guidewire 6. The double-core clamp tube is inserted inside the retrieval long sheath catheter 1, and the soft guidewire 6 is inserted inside the double-core clamp tube. The double-core clamp tube includes two soft tubes fixedly arranged side by side, namely clamp tube A 2 and clamp tube B 3. The heads of clamp tube A 2 and clamp tube B 3 are separated from each other, bent backwards, and meander towards each other at their ends. The end opening of clamp tube A 2 is set as a pointed constriction 4, and the end opening of clamp tube B 3 is set as a flared mouth 5 that fits into the end opening of clamp tube A 2. Figure 2 As shown, the engagement of the pointed constriction 4 and the flared opening 5 makes the head of the double-core clamp tube into a clamp shape. The tails of clamp tube A and clamp tube B 3 are separated from each other. The soft guide wire 6 enters from the tail of clamp tube A, exits from the pointed constriction 4, enters from the flared opening 5 at the head of clamp tube B 3, and exits from the tail of clamp tube B. The two ends of the soft guide wire 6 are pulled and fixed by the guide wire rotary resistor.

[0033] exist Figure 3 In the middle, the head of the double-core clamp tube is set at an angle of 45° with the body of the double-core clamp tube, and the direction of the inclination is perpendicular to the plane where clamp tubes A2 and B3 are located. Figure 4 In the process, the head of the recovery long sheath catheter 1 is tilted, and the angle between it and the main body of the recovery long sheath catheter 1 is 30°. The end face opening is set as a bevel opening, and the bevel angle of the end face is 30°.

[0034] In this invention, when the heads of the dual-core clamp tubes are separated, the pointed constriction of clamp tube A is 2mm long, the flared opening of clamp tube B is 2mm long, and the ends of clamp tube A and clamp tube B are 6mm apart. When the heads of the dual-core clamp tubes are snapped together, their heads are 2cm long and 1cm wide. The length of the retrieval long sheath catheter 1 is 80cm, and its head is 3cm long. The soft guidewire 6 is a common super-slippery soft guidewire with a length of 260cm. The guidewire rotary resistor is a common rotary resistor lock. The tail end of the dual-core clamp tube is also provided with a tail end sealing cap.

[0035] Example 2

[0036] One such Figure 1 When the filter retrieval device based on the dual-core clamp tube shown is used in interventional procedures for retrieval of vena cava filters, after the end of the retrieval sheath catheter 1 reaches above the filter 7, the dual-core clamp tube is introduced through the tail end and a tail end occlusion cap is installed to prevent tail end bleeding. After the head of the dual-core clamp tube extends out from the front end of the retrieval sheath catheter 1, the clamp jaws open automatically in the blood vessel lumen. The retrieval sheath catheter 1 and the dual-core clamp tube are rotated respectively to adjust the angle so that the clamp jaws of the head of the dual-core clamp tube are aligned with the filter 7. After the position is appropriate, the retrieval sheath catheter 1 is pushed so that the head of the dual-core clamp tube is close to the filter 7, so that the clamp jaws are locked.

[0037] If the retrieval hook 8 of the filter 7 is convenient for capture, insert the soft guide wire 6 from the tail of the clamp-shaped tube A, exit from the pointed constriction 4, enter from the flared end 5 of the clamp-shaped tube B 3, and exit from the tail of the clamp-shaped tube B, leaving a sufficiently long soft guide wire 6. Then, appropriately retract the double-core clamp-shaped tube and the soft guide wire 6, so that the heads of the clamp-shaped tube A and clamp-shaped tube B are separated. Use the soft guide wire 6 inserted between them to loop around the retrieval hook 8. Figure 5 As shown, after the loop is completed, tighten the soft guidewire 6 and lock both ends of the soft guidewire 6 with the guidewire rotary resistor. Pull the double-core clamp tube and the soft guidewire 6 and adjust their angle. Along the inclined surface of the tip of the retrieval long sheath catheter 1, pull the filter 7 into the retrieval long sheath catheter 1. Then, pull the filter 7 out of the patient's blood vessel together with the retrieval long sheath catheter 1 to complete the retrieval of the filter 7.

[0038] If the retrieval hook 8 of filter 7 is inconvenient to capture, such as when it is close to the blood vessel wall, the jaws of the head of the double-core clamp tube can be bypassed and fastened to the space between the retrieval hook 8 and the blood vessel wall. Then, the double-core clamp tube can be used to move filter 7 and adjust its posture so that the retrieval hook 8 is away from the blood vessel wall and exposed. Then, filter 7 can be retrieved by capturing the retrieval hook 8.

[0039] If the filter retrieval hook 8 is difficult to capture, the jaws of the dual-core clamp tube can be clamped to the middle of the filter. Then, the soft guidewire 6 is inserted from the tail of the clamp tube A, exits through the pointed constriction 4, enters through the flared end 5 of the clamp tube B 3, and exits from the tail of the clamp tube B. Sufficient length of the soft guidewire 6 is retained. The dual-core clamp tube is retracted appropriately, the soft guidewire 6 is tightened, and both ends of the soft guidewire 6 are locked using a guidewire rotary resistor. The dual-core clamp tube and the soft guidewire 6 are pulled, and their angles are adjusted. Along the bevel of the retrieval long sheath catheter 1, the filter 7 is pulled into the retrieval long sheath catheter 1. Then, the filter 7 is pulled out of the patient's blood vessel along with the retrieval long sheath catheter 1, completing the retrieval of the filter 7.

[0040] In summary, based on the above structure and operation method, it can be found that the filter recovery device based on the dual-core clamp tube of the present invention effectively reduces the difficulty of retrieval of vena cava filters, improves the success rate of retrieval, and can adapt to filters of various difficulty and insertion states, with significant effects.

Claims

1. Filter recovery device based on double core pincer tube, characterized in that: The invention relates to a double-core pincer-shaped tube, which comprises a recovery long sheath catheter, a double-core pincer-shaped tube arranged in the recovery long sheath catheter, and a soft guide wire arranged in the double-core pincer-shaped tube.

2. The dual core pincup based filter recovery device of claim 1, wherein: The head of the double-core pincer-shaped tube is obliquely arranged, and the oblique direction is perpendicular to the plane in which the pincer-shaped tube A and the pincer-shaped tube B are arranged.

3. The dual core pincer tube based filter recovery device of claim 2, wherein: The head of the recovery long sheath catheter is oblique, and the end surface opening is arranged as an inclined surface opening.

4. The dual core pincer tube based filter recovery device of claim 3, wherein: The angle between the head of the double-core pincer-shaped tube and the main body of the double-core pincer-shaped tube is 45°, and the angle between the head of the recovery long sheath catheter and the main body of the recovery long sheath catheter is 30°.

5. The dual core pincer tube based filter recovery device of claim 3, wherein: When the head of the double-core pincer-shaped tube is separated, the sharp neck of the pincer-shaped tube A is 2 mm long, the horn opening of the pincer-shaped tube B is 2 mm long, the distance between the ends of the pincer-shaped tube A and the pincer-shaped tube B is 6 mm, the length of the head of the double-core pincer-shaped tube is 2 cm, the width is 1 cm, and the length of the head of the recovery long sheath catheter is 3 cm.

6. The dual core pincup based filter recovery device of claim 1, wherein: The tail of the double-core pincer-shaped tube is provided with a guide wire rotation resistor, and the two ends of the soft guide wire are connected.

7. The dual core pincup based filter recovery device of claim 1, wherein: The tail of the double-core pincer-shaped tube is provided with a guide wire rotation resistor, and the two ends of the soft guide wire are connected.

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