Filter recovery device

Abstract

The present application relates to a filter recovery device, comprising: a sheath, which is hollow; a spork tube, which is hollow and slidingly arranged in the sheath, a distal end of the spork tube being provided with a spork; a retrieval forceps assembly, which is slidingly arranged in the spork tube, the retrieval forceps assembly comprising an inner rod, oppositely arranged upper and lower forceps, and a control structure for controlling the relative approach and departure of distal ends of the upper and lower forceps, the upper forceps being rotationally arranged relative to the inner rod about a first axis, the lower forceps being rotationally arranged relative to the inner rod about a second axis, the first and second axes being arranged in parallel, a distal end of the inner rod being arranged between the upper and lower forceps, the distal end of the inner rod being provided with an inner hole for threading a hook wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a filter recovery device. BACKGROUND

[0002] For deep vein thrombosis (DVT) patients with anticoagulation contraindications, implanting an inferior vena cava filter (IVCF) is an important technical measure for preventing pulmonary embolism. However, long-term retention of the inferior vena cava filter (IVCF) in the body has many potential risks, including filter tilting and displacement, filter fracture, intimalization, thrombosis, adjacent organ perforation, and bleeding, etc. Therefore, it is extremely necessary to timely and completely remove the filter.

[0003] The current vena cava filter recovery device uses a metal snare, a spiral catheter, or a recovery forceps or a three-pronged catcher to recover the filter. However, the vena cava filter recovery device has a single function, and is only provided with a single recovery structure. When the filter tilts and displaces, or even tissue adhesion exists, the single structure makes it difficult for the user to smoothly recover the filter. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a new filter recovery device that recovers the filter through the combination of multiple ways.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A filter recovery device, comprising:

[0007] A sheath tube, which is hollowly arranged;

[0008] A spade tube, which is hollowly arranged and slidingly arranged in the sheath tube, and a spade is arranged at the distal end of the spade tube;

[0009] A retrieval forceps assembly, which is slidingly arranged in the spade tube, and the retrieval forceps assembly comprises an inner rod, oppositely arranged upper and lower forceps, and a control structure for controlling the relative approach and departure of the distal end of the upper forceps and the distal end of the lower forceps, the upper forceps are rotationally arranged relative to the inner rod about a first axis, the lower forceps are rotationally arranged relative to the inner rod about 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 forceps and the lower forceps, and the distal end of the inner rod is provided with an inner hole for threading a hook wire.

[0010] In an embodiment, the control structure comprises a first inclined slot formed on the upper jaw, a second inclined slot formed on the lower jaw, and a push rod, the first inclined slot extends from the distal end of the first inclined slot to the proximal end of the first inclined slot, the second inclined slot extends from the distal end of the second inclined slot to the proximal end of the second inclined slot, the push rod has a sliding pin, the sliding pin is slidingly arranged in the first inclined slot and the second inclined slot, the filter recovery device has a taking-out jaw open state and a taking-out jaw closed state, when in the taking-out jaw open state, the sliding pin is located at the proximal end of the first inclined slot and the proximal end of the second inclined slot, the distal end of the upper jaw and the distal end of the lower jaw are relatively far away from each other, when in the taking-out jaw closed state, the sliding pin is located at the distal end of the first inclined slot and the distal end of the second inclined slot, the distal end of the upper jaw and the distal end of the lower jaw are relatively close to each other.

[0011] In an embodiment, a horizontal slot is formed on the inner rod, and the push rod is fixedly provided with a push rod pin, and the push rod pin is slidingly arranged in the horizontal slot.

[0012] In an embodiment, the push rod pin is the sliding pin, and the sliding pin is slidingly arranged in the first inclined slot, the second inclined slot and the horizontal slot.

[0013] In an 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 an embodiment, the proximal end of the push rod is further 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 slidingly cooperating with the sliding groove.

[0015] In an embodiment, the base further comprises a base body for preventing the knob from being detached from the threaded section, and the base body is arranged at the proximal end of the threaded section.

[0016] In an embodiment, the distal end of the inner rod comprises an inner rod body, an upper matching block arranged on the upper side of the inner rod body, and a lower matching block arranged on the lower side of the inner rod body, the upper jaw is rotationally connected with the upper matching block about the first axis, the lower jaw is rotationally connected with the lower matching block about the second axis, and the inner hole is arranged on the inner rod body.

[0017] In an embodiment, the taking-out forceps assembly comprises a limiting structure, the limiting structure comprises a first abutting part arranged on the upper fitting block and a second abutting part arranged on the lower fitting block, the upper forceps is provided with an upper groove, the lower forceps is provided with a lower groove, the upper fitting block is arranged in the upper groove, the lower fitting block is arranged in the lower groove, when the first abutting part abuts against the inner wall of the upper groove and the second abutting part abuts against the inner wall of the lower groove, the limiting structure prevents the distal end of the upper forceps and the distal end of the lower forceps from further moving away from each other.

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

[0019] In an embodiment, the filter recovery device comprises a shoveling cutter driving device for controlling the sliding of the shoveling cutter tube relative to the sheath tube, the shoveling cutter driving device comprises a shoveling cutter button fixedly connected with the shoveling cutter tube, and an elastic member arranged between the shoveling cutter button and the sheath tube, the elastic member is used to provide the required elastic force for retracting the shoveling cutter into the sheath tube.

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

[0021] In an embodiment, the hooking wire is one of a rotating wire, a loop-shaped wire, and a hook-shaped wire.

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

[0023] In an embodiment, the upper forceps is arranged away from the lower forceps along the up-down direction, the shoveling cutter is arranged on the left side of the upper forceps and the lower forceps, or the shoveling cutter is arranged on the right side of the upper forceps and the lower forceps.

[0024] Compared with the prior art, the present application has the following advantages due to the use of the above technical solutions:

[0025] 1. The filter recovery device of the present application can use the shoveling cutter structure to shovel off the tissue adhered to the filter, use the taking-out forceps assembly to clamp and take out the filter, and use the hooking wire to take out the inclined filter, effectively solving the pain points of the existing IVC filter inclination and adhesion to the tissue, and difficult recovery.

[0026] 2. In the present application, the shoveling cutter tube is arranged to slide relative to the sheath tube, and the taking-out forceps assembly is arranged to slide relative to the shoveling cutter tube, so that the extension of the shoveling cutter tube relative to the sheath tube and the extension of the taking-out forceps assembly relative to the shoveling cutter tube can be controlled respectively, enriching the use scenarios.

[0027] 3. In this invention, the upper and lower clamps are rotatably connected to the inner rod around different pivot points. By controlling the inner rod, the extension of the clamp assembly relative to the scraper tube can be controlled. Attached Figure Description

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

[0029] Figure 2 for Figure 1 A sectional view;

[0030] Figure 2a for Figure 2 Enlarged view of section A;

[0031] Figure 3 This is a perspective view of the distal end of a filter recovery device according to an embodiment of the present invention, where the extraction clamps are open and the hooks are extended.

[0032] Figure 4 This is a perspective view of the distal end of a filter recovery device according to an embodiment of the present invention. At this time, the extraction clamp is in the closed state and the hook is extended.

[0033] Figure 5 This is a perspective view of the distal end of a filter recovery device according to an embodiment of the present invention, where the extraction clamps are open and the hooks are retracted.

[0034] Figure 6 This is a three-dimensional schematic diagram of the distal end of a filter recovery device according to an embodiment of the present invention, where the hook is a looped wire;

[0035] Figure 7 This is a three-dimensional schematic diagram of the distal end of a filter recovery device according to an embodiment of the present invention, where the hook is a hook-shaped filament;

[0036] Figure 8 This is a perspective view of the near end of a filter recovery device according to an embodiment of the present invention;

[0037] Icon labels:

[0038] 1-Sheath tube; 2-Shovel tube; 21-Shovel; 22-Shovel button; 23-Elastic element; 31-Upper clamp; 311-First oblique groove; 32-Lower clamp; 321-Second oblique groove; 41-Inner rod; 411-Inner rod body; 412-Upper mating block; 413-Lower mating block; 414-Inner hole; 415-Horizontal groove; 416-First abutment part; 417-Second abutment part; 42-Base body; 43-Threaded section; 51-Push rod; 511-Sliding pin; 52-Knob; 521-Knob pin; 53-Fixed seat; 61-Rotating thread; 62-Circular thread; 63-Hook thread. Detailed Implementation

[0039] The present application will be further described in conjunction with the embodiments. In the description of the present application, the "proximal end" refers to the end close to the operator, and the "distal end" refers to the end away from the operator. As shown in the drawings, the lower side direction in the drawings is the "proximal end", the upper side direction in the drawings is the "distal end", the right side direction in the drawings is the "upper", the left side direction in the drawings is the "lower", the directions perpendicular to the viewing angle in the drawings are the "left" and the "right". The above definitions of the directions are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. Figure 1 As shown in the drawings, the filter recovery device of the present application comprises a sheath tube 1, a spatula tube 2, a retrieval forceps assembly, and a spatula driving device.

[0040] As shown in the drawings, the filter recovery device of the present application comprises a sheath tube 1, a spatula tube 2, a retrieval forceps assembly, and a spatula driving device. Figures 1-8 As shown in the drawings, the filter recovery device of the present application comprises a sheath tube 1, a spatula tube 2, a retrieval forceps assembly, and a spatula driving device.

[0041] The sheath tube 1 is hollowly arranged, and the distal end thereof is a pre-shaped elbow, which facilitates the delivery of the filter recovery device to the position where the filter is located.

[0042] The spatula tube 2 is hollowly arranged and slidably arranged in the sheath tube 1, and the distal end of the spatula tube 2 is provided with a spatula 21. The spatula 21 is a metal head, specifically an oval oblique cutting surface, which can shovel the tissue adhered to the filter from the wall of the blood vessel.

[0043] The retrieval forceps assembly is slidably arranged in the spatula tube 2, and comprises an inner rod 41, an upper forceps 31 and a lower forceps 32 arranged oppositely, a control structure for controlling the relative approaching and moving away of the distal ends of the upper forceps and the lower forceps, and a limiting structure.

[0044] In some embodiments, the upper forceps 31 can be arranged away from the lower forceps 32 in the up-down direction, and the spatula 21 is arranged on the left side of the upper forceps 31 and the lower forceps 32, or the spatula 21 is arranged on the right side of the upper forceps 31 and the lower forceps 32. By this arrangement, the spatula 21 can avoid interfering with the opening of the upper forceps 31 relative to the lower forceps 32, and affect the use of the retrieval forceps assembly.

[0045] The distal end of the inner rod 41 comprises an inner rod main body 411, an upper matching block 412 arranged on the upper side of the inner rod main body 411, and a lower matching block 413 arranged on the lower side of the inner rod main body 411. The upper forceps 31 is rotationally connected with the upper matching block 412 about a first axis line (not shown in the drawings), and the lower forceps 32 is rotationally connected with the lower matching block 413 about a second axis line (not shown in the drawings). The first axis line and the second axis line are arranged in parallel, and specifically, both the first axis line and the second axis line extend in the left-right direction. The distal end of the inner rod 41 is arranged between the upper forceps 31 and the lower forceps 32, and the distal end of the inner rod 41 is provided with an inner hole 414 for threading a hook wire. The inner hole 414 is arranged on the inner rod main body 411.Figures 3-4 As shown, the hook wire can be a rotating wire 61, as shown in Figure 6 As shown, the hook wire can also be a loop wire 62, as shown in Figure 7 As shown, the hook wire can also be a hook wire 63. The inner hole can also be used to pass the guide wire, which is used to guide the filter recovery device.

[0046] The control structure includes a first inclined groove 311 opened on the upper pliers 31, a second inclined groove 321 opened on the lower pliers 32, and a push rod 51, the first inclined groove 311 extends from the first inclined groove distal end to the first inclined groove proximal end, and the second inclined groove 311 extends from the second inclined groove distal end to the second inclined groove proximal end, the push rod 51 has a sliding pin 511, and the sliding pin 511 is slidingly arranged in the first inclined groove 311 and the second inclined groove 321. The inner rod 41 is provided with a horizontal groove 415 extending in the axial direction, and the push rod 51 is fixedly provided with a push rod pin slidingly arranged in the horizontal groove 415. By providing the horizontal groove 415 and the push rod pin, the sliding of the push rod 51 relative to the inner rod 41 is guided. In some embodiments, the push rod pin is the sliding pin 511, which is slidingly arranged 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 can be arranged separately.

[0047] The control structure further includes a base provided at the proximal end of the inner rod 41, a knob 52 provided at the proximal end of the push rod, and a fixed seat 53 provided 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, the fixed seat 53 is provided with a circumferentially arranged sliding groove (not shown in the figure), and the knob 52 is provided with a knob pin 521 slidingly matched with the sliding groove. By providing the knob pin 521 and the sliding groove, when the knob 52 rotates and axially moves on the threaded section 43, the push rod 51 can be pushed to axially slide relative to the inner rod 41, thereby controlling the extension and retraction of the extraction pliers assembly. The base body 42 is used to prevent the knob 52 from being detached from the threaded section 43.

[0048] The limiting structure includes a first abutting part 416 arranged on the upper fitting block 412 and a second abutting part 417 arranged on the lower fitting block 413. An upper slot (not shown in the figure) is arranged on the upper clamp 31, and a lower slot (not shown in the figure) is arranged on the lower clamp 32. The upper fitting block 412 is arranged in the upper slot, and the lower fitting block 413 is arranged in the lower slot. When the first abutting part 416 abuts against the inner wall of the upper slot, and the second abutting part 417 abuts against the inner wall of the lower slot, the limiting structure prevents the distal end of the upper clamp from further moving away from the distal end of the lower clamp. In some embodiments, the first abutting part 416 is the rear side wall of the upper fitting block 31, and the second abutting part 417 is the rear side wall of the lower fitting block 32. By arranging the limiting structure, the opening angle between the upper clamp 31 and the lower clamp 32 can be controlled, so as to avoid damaging the surrounding tissue due to the excessively large opening angle.

[0049] The spade driver is used to control the sliding of the spade tube 2 relative to the sheath tube 1, and includes a spade button 22 fixedly connected with the spade tube 2 and an elastic member 23 arranged between the spade button 22 and the sheath tube 1. The elastic member 23 is used to provide the required elastic force for retracting the spade 21 into the sheath tube 1. In some embodiments, the elastic member 23 is a spring, and the spring is sleeved on the outside of the spade tube 2. One end of the spring abuts against the sheath tube 1, and the other end of the spring abuts against the spade button 22.

[0050] The filter recovery device has an open state of the extraction forceps and a closed state of the extraction forceps. As shown in Figures 2-3 When the open state of the extraction forceps is reached, the sliding pin 511 is located at the proximal end of the first inclined slot and the proximal end of the second inclined slot, and the distal end of the upper clamp and the distal end of the lower clamp move away from each other, as shown in Figure 4 When the closed state of the extraction forceps is reached, the sliding pin 511 is located at the distal end of the first inclined slot and the distal end of the second inclined slot, and the distal end of the upper clamp and the distal end of the lower clamp move closer to each other.

[0051] In some embodiments, the method for using the filter recovery device is as follows:

[0052] Step 1: The filter recovery device is introduced to the target position through the guide wire;

[0053] Step 2: The spade button 22 is pressed, the elastic member 23 is compressed under force, the spade tube 2 slides along the axial direction to the distal end, the spade 21 extends relative to the sheath tube 1, and then the adhesion tissue is removed by using the spade 1. After the removal, the spade button 22 is released, and the spade tube 2 is retracted relative to the sheath tube 1 under the elastic force of the elastic member 23;

[0054] Third step A: push the inner rod proximal end, the inner rod 41 with the extraction forceps assembly relative to the sheath 1 stretch out, rotate the knob 52, make the knob 52 in the threaded segment 43 from the distal end to the proximal end rotation, drive the push rod 51 relative to the inner rod 41 along the axial direction to the proximal end sliding, the sliding pin 511 from the first inclined groove 311 and the second inclined groove 321 the distal end to the proximal end sliding, make the upper clamp 31 relative to the lower clamp 32 open, after the filter card is in the upper clamp 31 and the lower clamp 32 between, rotate the knob 52, make the knob 52 in the threaded segment 43 from the proximal end to the distal end rotation, drive the push rod 51 relative to the inner rod 41 along the axial direction to the distal end sliding, the sliding pin 511 from the first inclined groove 311 and the second inclined groove 321 the proximal end to the distal end sliding, make the upper clamp 31 relative to the lower clamp 32 close, after the filter is clamped, the sheath 1 along the guide wire is withdrawn;

[0055] Or, the third step can be replaced by the third step B: withdraw the guide wire, place the hook wire into the sheath 1, use the hook wire to hook out the filter.

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

[0057] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to let the person who is familiar with this technology can understand the content of the present application and implement, and cannot limit the protection scope of the present application. Any equivalent change or modification according to the spirit and essence of the present application should be covered in the protection scope of the present application.

Claims

1. A filter recovery device, characterized in that, include: Sheath, wherein the sheath is hollow; A shovel tube, which is hollow and slidably disposed within the sheath tube, and a shovel blade is provided at the distal end of the shovel tube; A removal clamp assembly is slidably disposed within the scraper tube. The removal clamp assembly includes an inner rod, an upper clamp and a lower clamp disposed opposite to each other, and a control structure for controlling the distal ends of the upper clamp and the distal ends of the lower clamp to move closer and further apart. The upper clamp is rotatably disposed relative to the inner rod about a first axis, and the lower clamp is rotatably disposed relative to the inner rod about a second axis. The first axis and the second axis are parallel to each other. The distal end of the inner rod is disposed between the upper clamp and the lower clamp, and the distal end of the inner rod is provided with an inner hole for threading a hook wire. The distal end of the inner rod includes an inner rod body, an upper mating block disposed on the upper side of the inner rod body, and a lower mating block disposed on the lower side of the inner rod body. The upper clamp is rotatably connected to the upper mating block about the first axis, and the lower clamp is rotatably connected to the lower mating block about the second axis. The inner hole is disposed on the inner rod body. The extraction clamp assembly includes a limiting structure, which includes a first abutting part disposed on the upper mating block and a second abutting part disposed on the lower mating block. The upper clamp has an upper groove, and the lower clamp has a lower groove. The upper mating block is disposed in the upper groove, and the lower mating block is disposed in the lower groove. When the first abutting part abuts against the inner wall of the upper groove, and the second abutting part abuts against the inner wall of the lower groove, the limiting structure prevents the distal end of the upper clamp from moving further away from the distal end of the lower clamp.

2. The filter recovery device according to claim 1, characterized in that: The control structure includes a first inclined groove formed on the upper clamp, a second inclined groove formed on the lower clamp, and a push rod. The first inclined groove extends from the distal end of the first inclined groove to the proximal end of the first inclined groove in an upward inclination. The second inclined groove extends from the distal end of the second inclined groove to the proximal end of the second inclined groove in an downward inclination. The push rod has a sliding pin, which is slidably disposed in the first and second inclined grooves. The filter recovery device has an open clamp state and a closed clamp state. When the clamp is in the open state, the sliding pin is located at the proximal ends of the first and second inclined grooves, and the distal ends of the upper and lower clamps are relatively far apart. When the clamp is in the closed state, the sliding pin is located at the distal ends of the first and second inclined grooves, and the distal ends of the upper and lower clamps are relatively close together.

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

4. The filter recovery device according to claim 3, characterized in that: The push rod pin is the sliding pin, which is slidably disposed 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 further includes a base disposed near the end of the inner rod and a knob disposed near the end of the push rod. The base includes a threaded section, and the knob engages 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 push rod is also provided with a fixed seat near its end. The fixed seat has a circumferentially arranged sliding groove, and the knob is provided with a knob pin that slides in cooperation with the sliding groove.

7. The filter recovery device according to claim 5, characterized in that: The base also includes a base body for preventing the knob from dislodging from the threaded section, the base body being disposed near the end of the threaded section.

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

9. The filter recovery device according to claim 1, characterized in that: The filter recovery device includes a shovel drive device for controlling the sliding of the shovel tube relative to the sheath tube. The shovel drive device includes a shovel button fixedly connected to the shovel tube and an elastic element disposed between the shovel button and the sheath tube. The elastic element is used to provide the required elastic force to retract the shovel into the sheath tube.

10. The filter recovery device according to claim 9, characterized in that: The elastic element is a spring, which is sleeved on the outside of the shovel tube. One end of the spring abuts against the sheath tube, and the other end of the spring abuts against the shovel button.

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

12. The filter recovery device according to claim 1, characterized in that: The inner hole is also used for threading guide wires.

13. The filter recovery device according to claim 1, characterized in that: The upper clamp can be positioned relatively away from the lower clamp in the vertical direction, and the shovel is positioned to the left of the upper clamp and the lower clamp, or to the right of the upper clamp and the lower clamp.

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