Filter recovery device

Abstract

The invention relates to a filter recovery device which comprises a hollow sheathing canal, a filter element and a filter element, the perching knife tube is arranged in a hollow mode and arranged in the sheath tube in a sliding mode, and a perching knife is arranged at the far end of the perching knife tube; the taking-out clamp assembly is arranged in the perching knife tube in a sliding mode, the taking-out clamp assembly comprises an inner rod, an upper clamp, a lower clamp and a control structure, the upper clamp and the lower clamp are oppositely arranged, the control structure is used for controlling the far end of the upper clamp and the far end of the lower clamp to be relatively close to each other and away from each other, and the upper clamp is rotationally arranged relative to the inner rod around a first axis; the upper clamp is rotatably arranged around a first axial lead relative to the inner rod, the lower clamp is rotatably arranged around a second axial lead relative to the inner rod, the first axial lead and the second axial lead are arranged in parallel, the far end part of the inner rod is arranged between the upper clamp and the lower clamp, and the far end part of the inner rod is provided with an inner hole for a hooked wire to penetrate through.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a filter recovery device. Background Art

[0002] For patients with deep vein thrombosis (DVT) who are contraindicated for anticoagulation, placement of an inferior vena cava filter (IVCF) is an important technical measure to prevent pulmonary embolism. However, long-term retention of an IVCF in the body carries many potential risks, including filter tilt and displacement, filter breakage, endometrialization, thrombosis, adjacent organ perforation, and bleeding. Therefore, timely and complete removal of the filter is extremely necessary.

[0003] The current vena cava filter recovery devices use metal ferrules, spiral catheters, recovery forceps, or three-claw catchers to recover the filter. However, the functions of such vena cava filter recovery devices are often relatively simple, and they are only equipped with a single recovery structure. When the filter is tilted and displaced, or even has tissue adhesion, the setting of the single structure makes it difficult for the user to recover the filter smoothly. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new filter recovery device, which recovers the filter by combining multiple methods.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A filter recovery device, comprising:

[0007] A sheath tube, wherein the sheath tube is hollow;

[0008] A scraper tube, which is hollow and slidably disposed in the sheath tube, and a scraper is disposed at a distal end of the scraper tube;

[0009] A removal clamp assembly, which is slidably arranged in the scraper tube, and includes an inner rod, an upper clamp and a lower clamp arranged opposite to each other, and a control structure for controlling the relative approach and separation of the distal ends of the upper clamp and the lower clamp, the upper clamp is rotatably arranged relative to the inner rod around a first axis, the lower clamp is rotatably arranged relative to the inner rod around a second axis, the first axis and the second axis are arranged in parallel, the distal end of the inner rod is arranged between the upper clamp and the lower clamp, and the distal end of the inner rod is provided with an inner hole for passing a hook wire.

[0010] In one embodiment, the control structure includes a first oblique groove provided on the upper jaw, a second oblique groove provided on the lower jaw, and a push rod, the first oblique groove extends obliquely from bottom to top from the distal end of the first oblique groove to the proximal end of the first oblique groove, the second oblique groove extends obliquely from top to bottom from the distal end of the second oblique groove to the proximal end of the second oblique groove, the push rod has a sliding pin, and the sliding pin is slidably set in the first oblique groove and the second oblique groove, the filter recovery device has an open state of the removal jaws and a closed state of the removal jaws, when in the open state of the removal jaws, the sliding pin is located at the proximal ends of the first oblique groove and the proximal ends of the second oblique groove, and the distal ends of the upper jaw and the lower jaw are relatively far apart, when in the closed state of the removal jaws, the sliding pin is located at the distal ends of the first oblique groove and the distal ends of the second oblique groove, and the distal ends of the upper jaw and the lower jaw are relatively close.

[0011] In one embodiment, a horizontal groove is formed on the inner rod, and a push rod pin is fixedly provided on the push rod, and the push rod pin is slidably disposed in the horizontal groove.

[0012] In one embodiment, the push rod pin is the sliding pin, and the sliding pin is slidably disposed in the first inclined groove, the second inclined groove and the horizontal groove.

[0013] In one embodiment, the control structure further comprises a base arranged at the proximal end of the inner rod and a knob arranged at the proximal end of the push rod, the base comprises a threaded section, and the knob cooperates with the threaded section to control the axial sliding of the push rod relative to the inner rod.

[0014] In one embodiment, a fixing seat is further provided at the proximal end of the push rod, a circumferentially arranged sliding groove is provided on the fixing seat, and the knob is provided with a knob pin that slidably cooperates with the sliding groove.

[0015] In one embodiment, the base further comprises a base body for preventing the knob from being disengaged from the threaded segment, and the base body is disposed at a proximal end of the threaded segment.

[0016] In one embodiment, the distal end of the inner rod includes an inner rod body, an upper mating block arranged on the upper side of the inner rod body, and a lower mating block arranged on the lower side of the inner rod body, the upper clamp is rotatably connected to the upper mating block around the first axis, the lower clamp is rotatably connected to the lower mating block around the second axis, and the inner hole is arranged on the inner rod body.

[0017] In one embodiment, the removal forceps assembly includes a limiting structure, which includes a first abutting portion arranged on the upper mating block and a second abutting portion arranged on the lower mating block. The upper forceps is provided with an upper groove, and the lower forceps is provided with a lower groove. The upper mating block is arranged in the upper groove, and the lower mating block is arranged in the lower groove. When the first abutting portion abuts against the inner wall of the upper groove, and the second abutting portion abuts against the inner wall of the lower groove, the limiting structure prevents the distal end portion of the upper forceps from moving further away from the distal end portion of the lower forceps.

[0018] In one embodiment, the first axis and the second axis both extend in the left-right direction.

[0019] In one embodiment, the filter recovery device includes a scraper driving device for controlling the scraper tube to slide relative to the sheath tube, the scraper driving device includes a scraper button fixedly connected to the scraper tube, and an elastic member arranged between the scraper button and the sheath tube, and the elastic member is used to provide the elastic force required to retract the scraper into the sheath tube.

[0020] In one embodiment, the elastic member is a spring, the elastic member is sleeved outside the scraper tube, one end of the spring is against the sheath tube, and the other end of the spring is against the scraper button.

[0021] In one embodiment, the hook wire is one of a rotating wire, a looped wire or a hooked wire.

[0022] In one embodiment, the inner hole is also used for passing a guide wire.

[0023] In one embodiment, the upper jaw may be disposed away from the lower jaw in the up-down direction, and the scraper may be disposed on the left side of the upper jaw and the lower jaw, or the scraper may be disposed on the right side of the upper jaw and the lower jaw.

[0024] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0025] 1. The filter recovery device of the present invention is provided with a scraper tube, a removal forceps assembly and an inner hole for inserting a hook wire. The scraper structure can be used to scrape and peel off the tissue adhered to the filter, the removal forceps assembly can be used to clamp and remove the filter, and the hook wire can be used to remove the tilted filter, which effectively solves the pain point that the existing vena cava filter is tilted and adhered to the tissue, making it difficult to recover;

[0026] 2. In the present invention, the scraper tube is slidably arranged relative to the sheath tube, and the extraction forceps assembly is slidably arranged relative to the scraper tube, which can respectively control the extension of the scraper tube relative to the sheath tube and the extension of the extraction forceps assembly relative to the scraper tube, thereby enriching the use scenarios;

[0027] 3. In the present invention, the upper jaw and the lower jaw are rotatably connected to the inner rod around different rotation points, and the extension of the removal jaw assembly relative to the scraper tube can be controlled by controlling the inner rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A side view of a filter recovery device according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional view of

[0030] Figure 2a for Figure 2 A magnified view of part A;

[0031] Figure 3 It is a three-dimensional schematic diagram of the distal end portion of the filter recovery device according to one embodiment of the present invention, in which the removal forceps are in an open state and the hook wire is extended;

[0032] Figure 4 It is a three-dimensional schematic diagram of the distal end portion of the filter recovery device according to one embodiment of the present invention, in which the removal forceps are in a closed state and the hook wire is extended;

[0033] Figure 5 It is a three-dimensional schematic diagram of the distal end portion of the filter recovery device according to an embodiment of the present invention, in which the removal forceps are in an open state and the hook wire is retracted;

[0034] Figure 6 It is a three-dimensional schematic diagram of the distal end portion of the filter recovery device according to one embodiment of the present invention, in which the hooked wire is a loop-shaped wire;

[0035] Figure 7 It is a three-dimensional schematic diagram of the distal end portion of the filter recovery device according to one embodiment of the present invention, in which case the hook wire is a hook-shaped wire;

[0036] Figure 8 It is a three-dimensional schematic diagram of the proximal portion of a filter recovery device according to an embodiment of the present invention;

[0037] Figure Number:

[0038] 1-sheath; 2-blade tube; 21-blade; 22-blade button; 23-elastic member; 31-upper clamp; 311-first oblique groove; 32-lower clamp; 321-second oblique groove; 41-inner rod; 411-inner rod body; 412-upper matching block; 413-lower matching block; 414-inner hole; 415-horizontal groove; 416-first abutment portion; 417-second abutment portion; 42-base body; 43-threaded section; 51-push rod; 511-sliding pin; 52-knob; 521-knob pin; 53-fixed seat; 61-rotating wire; 62-loop wire; 63-hook wire. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with embodiments. In the description of the present invention, the "proximal end" is the end close to the operator, and the "distal end" is the end far from the operator. Figure 1 As shown, the lower direction in the figure is the "proximal end", the upper direction in the figure is the "distal end", the right direction in the figure is "up", the left direction in the figure is "down", and the directions perpendicular to the viewing angle in the figure are "left" and "right". The definitions of the above directions are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] like Figure 1-8 As shown, the filter recovery device of the present invention comprises a sheath tube 1, a scraper tube 2, a removal forceps assembly, and a scraper driving device.

[0041] The sheath tube 1 is hollow, and its distal end is a pre-shaped elbow, which facilitates the filter recovery device to be delivered to the location of the filter.

[0042] The scraper tube 2 is hollow and slidably arranged in the sheath tube 1. A scraper 21 is arranged at the distal end of the scraper tube 2. The scraper 21 is a metal head, specifically an elliptical beveled surface, which can scrape the tissue adhered to the filter off the blood vessel wall.

[0043] The removal clamp assembly is slidably arranged in the scraper tube 2, and the removal clamp assembly includes an inner rod 41, an upper clamp 31 and a lower clamp 32 arranged opposite to each other, a control structure for controlling the upper clamp distal end portion and the lower clamp distal end portion to move closer to and away from each other, and a limiting structure.

[0044] In some embodiments, the upper jaw 31 can be arranged away from the lower jaw 32 in the up and down direction, and the scraper 21 is arranged on the left side of the upper jaw 31 and the lower jaw 32, or the scraper 21 is arranged on the right side of the upper jaw 31 and the lower jaw 32. Through this arrangement, it can be avoided that the scraper 21 interferes with the opening of the upper jaw 31 relative to the lower jaw 32, affecting the use of the removal jaw assembly.

[0045] The distal end of the inner rod 41 includes an inner rod body 411, an upper matching block 412 arranged on the upper side of the inner rod body 411, and a lower matching block 413 arranged on the lower side of the inner rod body 411. The upper jaw 31 is rotatably connected to the upper matching block 412 around a first axis (not shown in the figure), and the lower jaw 32 is rotatably connected to the lower matching block 413 around a second axis (not shown in the figure). The first axis and the second axis are arranged in parallel. Specifically, the first axis and the second axis both extend in the left and right directions. The distal end of the inner rod 41 is arranged between the upper jaw 31 and the lower jaw 32. The distal end of the inner rod 41 is provided with an inner hole 414 for threading a hook. The inner hole 414 is arranged on the inner rod body 411. Figure 3-4 As shown, the hook wire can be a rotating wire 61, such as Figure 6 As shown, the hook wire can also be a loop wire 62, such as Figure 7 As shown, the hook wire may also be a hook-shaped wire 63. The inner hole may also be used to thread a guide wire, which is used to introduce a filter recovery device.

[0046] The control structure includes a first oblique groove 311 opened on the upper jaw 31, a second oblique groove 321 opened on the lower jaw 32, and a push rod 51. The first oblique groove 311 extends obliquely from the distal end of the first oblique groove to the proximal end of the first oblique groove from bottom to top, and the second oblique groove 311 extends obliquely from the distal end of the second oblique groove to the proximal end of the second oblique groove from top to bottom. The push rod 51 has a sliding pin 511, which is slidably arranged in the first oblique groove 311 and the second oblique groove 321. A horizontal groove 415 is provided on the inner rod 41, and the horizontal groove 415 extends in the axial direction. The push rod 51 is fixedly provided with a push rod pin, and the push rod pin is slidably set in the horizontal groove 415. By setting the horizontal groove 415 and the push rod pin, a guide is provided for the sliding of the push rod 51 relative to the inner rod 41. In some embodiments, the push rod pin is a sliding pin 511, and the sliding pin 511 is slidably set in the first inclined groove 311, the second inclined groove 321 and the horizontal groove 415. In other embodiments, the push rod pin and the sliding pin 511 may also be set separately.

[0047] The control structure also includes a base arranged at the proximal end of the inner rod 41, a knob 52 arranged at the proximal end of the push rod, and a fixed seat 53 arranged at the proximal end of the push rod. The base includes a threaded section 43 and a base body 42 fixedly connected to the proximal end of the threaded section 43. The knob 52 cooperates with the threaded section 43 to control the axial sliding of the push rod 51 relative to the inner rod 41. A circumferentially arranged sliding groove (not shown in the figure) is provided on the fixed seat 53. The knob 52 is provided with a knob pin 521 that slidably cooperates with the sliding groove. By providing the knob pin 521 and the sliding groove, when the knob 52 rotates and moves axially on the threaded section 43, the push rod 51 can be pushed to slide axially relative to the inner rod 41, thereby controlling the extension and retraction of the removal forceps assembly. The base body 42 is used to prevent the knob 52 from falling out of the threaded section 43.

[0048] The limiting structure includes a first abutment portion 416 arranged on the upper matching block 412 and a second abutment portion 417 arranged on the lower matching block 413. An upper groove (not shown in the figure) is opened on the upper jaw 31, and a lower groove (not shown in the figure) is opened on the lower jaw 32. The upper matching block 412 is arranged in the upper groove, and the lower matching block 413 is arranged in the lower groove. When the first abutment portion 416 abuts against the inner wall of the upper groove, and the second abutment portion 417 abuts against the inner wall of the lower groove, the limiting structure prevents the distal end portion of the upper jaw from moving further away from the distal end portion of the lower jaw. In some embodiments, the first abutment portion 416 is the rear side wall of the upper matching block 31, and the second abutment portion 417 is the rear side wall of the lower matching block 32. By setting the limiting structure, the opening angle between the upper jaw 31 and the lower jaw 32 can be controlled to avoid damage to surrounding tissues due to excessive opening angle.

[0049] The scraper drive device is used to control the sliding of the scraper tube 2 relative to the sheath 1, including a scraper button 22 fixedly connected to the scraper tube 2, and an elastic member 23 arranged between the scraper button 22 and the sheath 1, and the elastic member 23 is used to provide the elastic force required to retract the scraper 21 into the sheath 1. In some embodiments, the elastic member 23 is a spring, and the elastic member 23 is sleeved on the outside of the scraper tube 2, one end of the spring is against the sheath 1, and the other end of the spring is against the scraper button 22.

[0050] The filter recovery device has an open state of the extraction clamp and a closed state of the extraction clamp, such as Figure 2-3 As shown, when the removal forceps are in the open state, the sliding pin 511 is located at the proximal end of the first inclined groove and the proximal end of the second inclined groove, and the distal end of the upper forceps and the distal end of the lower forceps are relatively far apart, as shown in FIG. Figure 4 As shown, when the removal forceps are in the closed state, the sliding pin 511 is located at the distal end of the first oblique groove and the distal end of the second oblique groove, and the distal end of the upper forceps and the distal end of the lower forceps are relatively close.

[0051] In some embodiments, the filter recovery device is used as follows:

[0052] Step 1: Introduce the filter retrieval device into the target location through the guide wire;

[0053] Step 2: Press the scraper button 22, the elastic member 23 is compressed, the scraper tube 2 slides axially toward the distal end, the scraper 21 extends relative to the sheath tube 1, and then the scraper 1 is used to remove the adhesion tissue. After removal, the scraper button 22 is released, and the scraper tube 2 is retracted relative to the sheath tube 1 by the elastic force of the elastic member 23;

[0054] Step 3A: Push the proximal end of the inner rod, the inner rod 41 drives the removal forceps assembly to extend relative to the sheath tube 1, rotate the knob 52, so that the knob 52 rotates from the distal end to the proximal end in the threaded section 43, and drives the push rod 51 to slide axially toward the proximal end relative to the inner rod 41, and the sliding pin 511 slides from the distal end of the first inclined groove 311 and the second inclined groove 321 to the proximal end, so that the upper forceps 31 is opened relative to the lower forceps 32, and the filter is clamped between the upper forceps 31 and the lower forceps 32, and then the knob 52 is rotated so that the knob 52 rotates from the proximal end to the distal end in the threaded section 43, and drives the push rod 51 to slide axially toward the distal end relative to the inner rod 41, and the sliding pin 511 slides from the proximal end of the first inclined groove 311 and the second inclined groove 321 to the distal end, so that the upper forceps 31 is closed relative to the lower forceps 32, and after the filter is clamped, the sheath tube 1 is withdrawn along the guide wire;

[0055] Alternatively, the third step can be replaced by the third step B: withdraw the guide wire, insert a hook wire into the sheath tube 1, and use the hook wire to hook out the filter.

[0056] In other embodiments, the second step, the third step A, and the third step B may be interchanged in order or repeated multiple times.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A filter recovery device, characterized in that: include: A sheath tube, wherein the sheath tube is hollow; A scraper tube, which is hollow and slidably disposed in the sheath tube, and a scraper is disposed at a distal end of the scraper tube; A removal clamp assembly, which is slidably arranged in the scraper tube, and includes an inner rod, an upper clamp and a lower clamp arranged opposite to each other, and a control structure for controlling the relative approach and separation of the distal ends of the upper clamp and the lower clamp, the upper clamp is rotatably arranged relative to the inner rod around a first axis, the lower clamp is rotatably arranged relative to the inner rod around a second axis, the first axis and the second axis are arranged in parallel, the distal end of the inner rod is arranged between the upper clamp and the lower clamp, and the distal end of the inner rod is provided with an inner hole for passing a hook wire.

2. The filter recovery device according to claim 1, characterized in that: The control structure includes a first oblique groove provided on the upper jaw, a second oblique groove provided on the lower jaw, and a push rod, the first oblique groove extending obliquely from bottom to top from the distal end of the first oblique groove to the proximal end of the first oblique groove, the second oblique groove extending obliquely from top to bottom from the distal end of the second oblique groove to the proximal end of the second oblique groove, the push rod having a sliding pin, the sliding pin being slidably arranged in the first oblique groove and the second oblique groove, the filter recovery device having an open state of the removal jaws and a closed state of the removal jaws, when in the open state of the removal jaws, the sliding pin is located at the proximal end of the first oblique groove and the proximal end of the second oblique groove, and the distal end of the upper jaw and the distal end of the lower jaw are relatively far apart, and when in the closed state of the removal jaws, the sliding pin is located at the distal end of the first oblique groove and the distal end of the second oblique groove, and the distal end of the upper jaw and the distal end of the lower jaw are relatively close.

3. The filter recovery device according to claim 2, characterized in that: A horizontal groove is provided on the inner rod, and a push rod pin is fixedly provided on the push rod, and the push rod pin is slidably arranged in the horizontal groove.

4. The filter recovery device according to claim 3, characterized in that: The push rod pin is the sliding pin, and the sliding pin is slidably arranged in the first inclined groove, the second inclined groove and the horizontal groove.

5. The filter recovery device according to claim 2, characterized in that: The control structure also includes a base arranged at the proximal end of the inner rod and a knob arranged at the proximal end of the push rod. The base includes a threaded section, and the knob cooperates with the threaded section to control the axial sliding of the push rod relative to the inner rod.

6. The filter recovery device according to claim 5, characterized in that: The proximal end of the push rod is also provided with a fixing seat, the fixing seat is provided with a circumferentially arranged sliding groove, and the knob is provided with a knob pin that slidably cooperates with the sliding groove.

7. The filter recovery device according to claim 5, characterized in that: The base further comprises a base body for preventing the knob from being disengaged from the threaded section, wherein the base body is arranged at a proximal end of the threaded section.

8. The filter recovery device according to claim 1, characterized in that: The distal end of the inner rod includes an inner rod body, an upper mating block arranged on the upper side of the inner rod body, and a lower mating block arranged on the lower side of the inner rod body. The upper clamp is rotatably connected to the upper mating block around the first axis, and the lower clamp is rotatably connected to the lower mating block around the second axis. The inner hole is arranged on the inner rod body.

9. The filter recovery device according to claim 8, characterized in that: The removal forceps assembly includes a limiting structure, which includes a first abutting portion arranged on the upper matching block and a second abutting portion arranged on the lower matching block. The upper forceps is provided with an upper groove, and the lower forceps is provided with a lower groove. The upper matching block is arranged in the upper groove, and the lower matching block is arranged in the lower groove. When the first abutting portion abuts against the inner wall of the upper groove, and the second abutting portion abuts against the inner wall of the lower groove, the limiting structure prevents the distal end portion of the upper forceps from moving further away from the distal end portion of the lower forceps.

10. The filter recovery device according to claim 1, characterized in that: The first axis and the second axis both extend in the left-right direction.

11. The filter recovery device according to claim 1, characterized in that: The filter recovery device includes a scraper drive device for controlling the scraper tube to slide relative to the sheath tube, the scraper drive device includes a scraper button fixedly connected to the scraper tube, and an elastic member arranged between the scraper button and the sheath tube, and the elastic member is used to provide the elastic force required to retract the scraper into the sheath tube.

12. The filter recovery device according to claim 11, characterized in that: The elastic member is a spring, which is sleeved outside the scraper tube, one end of the spring is against the sheath tube, and the other end of the spring is against the scraper button.

13. The filter recovery device according to claim 1, characterized in that: The hooked wire is one of a rotating wire, a looped wire or a hooked wire.

14. The filter recovery device according to claim 1, characterized in that: The inner hole is also used for passing a guide wire.

15. The filter recovery device according to claim 1, characterized in that: The upper jaw may be arranged away from the lower jaw in the up-down direction, and the scraper may be arranged on the left side of the upper jaw and the lower jaw, or the scraper may be arranged on the right side of the upper jaw and the lower jaw.

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