Implant capturing and taking-out device

Abstract

The invention provides an implant capturing and taking-out device, which relates to the field of medical instruments and comprises an outer tube assembly and an inner tube assembly, the outer tube assembly comprises an outer tube handle and an outer tube; the inner pipe assembly comprises an inner pipe, an inner pipe handle, a clamping jaw handle and a push-pull mechanism. At least three groups of clamping jaw arms are hinged to the far end of the inner tube, and the clamping jaw arms are arranged at intervals in the circumferential direction of the inner tube; one end of the push-pull mechanism is in transmission connection with each group of clamping jaw arms, and the other end of the push-pull mechanism is connected with the clamping jaw handle; when the clamping jaw handle is moved relative to the inner pipe handle, the push-pull mechanism can be driven to control the far ends of the clamping jaw arms to be opened outwards or closed inwards in the radial direction of the inner pipe, and the clamping jaw handle can be locked to the inner pipe handle so as to lock the opening and closing states of the clamping jaw arms; the inner tube handle is arranged on the near end side of the outer tube handle and can axially slide relative to the outer tube handle. The technical problem that an implant implanted into the body of a patient is difficult to capture and obtain in an existing implant intervention operation is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to an implant capturing and removing device. Background Art

[0002] During implantation surgery, sometimes it is necessary to implant fasteners, valve clamps and other implants into human organs, and these implants will remain in the patient's body permanently or for a period of time, which plays a key role in the patient's health and recovery. However, if the implant is implanted in an inaccurate position or angle, or if the implant becomes loose or displaced due to the influence of human blood flow after implantation, or if the implant fails due to aging, etc., the implant needs to be removed from the patient's body.

[0003] However, due to the different shapes and specifications of implants, there are mainly two types of existing implant removal instruments. One type is to set a connector that is consistent with the shape and size of the implant end at the front end of the tube body of the instrument. For example, for the fastening nail, a sleeve with an internal thread is set. When removing, the sleeve is threadedly connected to the end of the fastening nail and then removed; the other type is to pass a rope loop through the tube body of the instrument, through which the rope loop is set on the "neck" set at the end of the implant, and the outer tube is pushed forward to shrink the rope loop, and then the implant is pulled out of the patient's body. This type of implant requires a "neck" that can be used for the rope loop, and the implant is easy to fall off during the process of withdrawing from the patient's body. In addition, no matter which type of removal instrument is used, there are problems such as difficulty in positioning, inability to quickly align with the selected implant, and inability to be applicable to multiple types of implants. In addition, after being implanted in the patient's body for a period of time, the implant will often produce endothelialization between the patient's organ tissue. At this time, when the implant is removed by interventional means, the implant will pull the patient's organ tissue, making removal difficult and causing great trauma to the patient. Summary of the invention

[0004] The object of the present invention is to provide an implant capture and retrieval device to at least alleviate at least one of the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: An embodiment of the present invention provides an implant capture and retrieval device, comprising an outer tube component and an inner tube component; The outer tube assembly comprises an outer tube handle and an outer tube whose proximal end is fixedly connected to the inner part of the outer tube handle; The inner tube assembly comprises an inner tube, an inner tube handle, a claw handle and a push-pull mechanism; the proximal end of the inner tube is fixedly connected to the inner tube handle, and the distal end of the inner tube is hinged with at least three groups of claw arms, and the at least three groups of claw arms are arranged at intervals along the circumference of the inner tube; the claw handle is movably installed on the inner tube handle, one end of the push-pull mechanism is transmission-connected to each group of the claw arms, and the other end of the push-pull mechanism is connected to the claw handle; the claw handle is movable relative to the inner tube handle, and the push-pull mechanism can be driven to control the distal ends of the at least three groups of claw arms to open outward or close inward along the radial direction of the inner tube, and the claw handle can be locked to the inner tube handle to lock the opening and closing state of the at least three groups of claw arms; The inner tube passes through the outer tube, the inner tube handle is arranged on the proximal side of the outer tube handle, and the inner tube handle can slide axially relative to the outer tube handle so that the at least three groups of claw arms extend or retract to the distal end of the outer tube.

[0006] In an optional technical solution of the embodiment of the present invention: the inner tube includes a main body inner tube section and a distal inner tube section that are fixed or integrally connected; The push-pull mechanism comprises a central hinge block and a push-pull member, wherein the central hinge block is suspended at the distal end side of the distal inner tube section; The at least three groups of claw arms are arranged circumferentially around the central hinge block; each group of claw arms comprises a respective fixed arm, an articulated arm and a clamping arm; the side of each clamping arm facing the axis of the distal inner tube section is the respective inner side, and the side away from the axis of the distal inner tube section is the respective outer side, and each clamping arm is in a curved shape convex from the respective inner side to the respective outer side; the proximal end of the fixed arm is fixedly connected to the distal surface edge area of ​​the distal inner tube section; the proximal end of the articulated arm is hinged to the distal end of the fixed arm; the distal end of the clamping arm is suspended, the proximal end of the clamping arm is hinged to the connecting protrusion provided on the outer wall of the central hinge block, and the part of the clamping arm close to the proximal end is hinged to the distal end of the articulated arm; The push-pull member passes through the inner tube, the distal end of the push-pull member is fixedly connected to the central hinge block, and the proximal end of the push-pull member is fixedly or transmission-connected to the claw handle; The claw handle is movable relative to the inner tube handle, so that under a first working condition, the push-pull member can be pulled in a proximal direction relative to the inner tube so that the distal ends of the clamping arms of the at least three groups of claw arms are closed radially inward along the distal inner tube section, and, under a second working condition, the push-pull member can be pushed in a distal direction relative to the inner tube so that the distal ends of the clamping arms of the at least three groups of claw arms are opened radially outward along the distal inner tube section.

[0007] Further optionally, the push-pull member is a push-pull wire, and the push-pull mechanism further includes a return spring; The inner tube also includes a tube seat, the distal end of the main body inner tube section is connected to the proximal end of the tube seat, the proximal end of the distal inner tube section is connected to the distal end of the tube seat, and an axial through hole is provided inside the tube seat; an end plate is fixed or integrally connected to the distal end surface of the distal inner tube section, and an end plate through hole is provided in the middle of the end plate; The push-pull wire passes through the main body inner tube section, the axial through hole of the tube seat and the end plate through hole of the distal inner tube section in sequence, and the push-pull wire is located inside the distal inner tube section and is fixedly connected to a stopper near the end plate; The return spring is arranged inside the distal inner tube section and is located between the tube seat and the stop block; the return spring is configured to always push the stop block in the distal direction relative to the distal inner tube section, so that the distal ends of the clamping arms of the at least three groups of claw arms have a movement tendency to open radially outward along the distal inner tube section; pulling the push-pull wire in the proximal direction relative to the inner tube can drive the stop block to compress the return spring in the proximal direction, so that the distal ends of the clamping arms of the at least three groups of claw arms are closed radially inward along the distal inner tube section.

[0008] Optionally, the claw handle is a knob handle, with the axial direction of the inner tube as the axial direction of the inner tube handle, the claw handle is coaxial with the inner tube handle, is axially limited to the inner tube handle, and can rotate circumferentially relative to the inner tube handle; The push-pull member is a push-pull wire or a push-pull rod; the push-pull mechanism also includes a transmission rod, which is circumferentially limited and axially slidably installed inside the inner tube handle, and the claw handle is sleeved on the outside of the transmission rod and threadedly connected to the transmission rod; the proximal end of the push-pull member is fixedly connected to the transmission rod.

[0009] Optionally, each group of the claw arms further comprises a capture clip; The capture clip comprises a clip body and a mounting block; The clip body has a length direction, a width direction and a thickness direction, and the two opposite sides of the clip body in the thickness direction are respectively a clip inner surface and a clip outer surface, and at least the edge line of the clip inner surface on the cross section obtained by cutting the clip body along the width direction and the thickness direction is an arc line with the middle part convex toward the clip outer surface; The mounting block is fixed or integrally connected to the outer surface of the clip, and the mounting block is rotatably mounted on the distal end of the clamping arm via a hinge shaft; wherein the edge line of the inner surface of the clip on the cross section formed by cutting the capturing clip along the width direction and the thickness direction is parallel to the circumferential line of the distal inner tube section, and the extension direction of the hinge shaft is parallel to the tangent line of the circumferential line of the distal inner tube section.

[0010] Further optionally, each group of the claw arms also includes a clip spring, and a spring mounting portion is also provided on the outer surface of the clip, one end of the clip spring is connected to the spring mounting portion, and the other end is connected to the clamping arm, and the clip spring is configured so that the capturing clip always has a movement tendency to rotate around the hinge axis relative to the clamping arm to an initial state; in the initial state, the clip body is located on one side of the axis of the clamping arm toward the distal inner tube section, and the inner surface of the clip is an inclined surface with the distal end located on the outside of the proximal end.

[0011] Optionally, the edges of the clip outer surface and the clip inner surface on a cross section of the clip body cut along the width direction and the thickness direction are parallel to each other.

[0012] In an optional technical solution of the embodiment of the present invention, the outer tube assembly further includes a middle tube, a middle tube knob and a rotation-in and rotation-out transmission assembly; The axial direction of the outer tube is taken as the axial direction of the outer tube handle, and the middle tube knob is installed on the outer tube handle in a manner of being coaxial with the outer tube handle, being axially limited to the outer tube handle, and being able to rotate circumferentially relative to the outer tube handle; the screw-in and screw-out transmission assembly is arranged inside the outer tube handle, the middle tube passes through the outer tube, and the proximal end of the middle tube is connected to the middle tube knob through the screw-in and screw-out transmission assembly; at least one cutting groove is arranged on the distal end surface of the middle tube, which radially passes through the tube wall of the middle tube, and the remaining part of the distal end of the middle tube except the cutting groove forms a cutter, and the cutter has a distal blade and a side blade; rotating the middle tube knob relative to the outer tube handle can drive the screw-in and screw-out transmission assembly to drive the middle tube to rotate circumferentially relative to the outer tube while sliding axially, so that the cutter screws out of the outer tube toward the distal direction, or screws back into the outer tube toward the proximal direction; The inner tube passes through the middle tube, and the inner tube handle can slide axially relative to the outer tube handle so that the at least three groups of claw arms extend out or retract to the distal end of the middle tube.

[0013] Further optionally, the cutter includes a proximal section, an inclined section and a distal section connected in sequence from the proximal end to the distal end of the middle tube, the inclined section gradually inclines radially outward from the proximal end to the distal end of the distal section, and the distal blade and the side blade are arranged in the distal region of the distal section.

[0014] Optionally, the advance and retreat transmission assembly includes a proximal stop tube, a distal stop tube and a rotating sleeve; One end of the proximal stop tube is integrally connected or fixedly connected or axially and circumferentially limited to the middle tube knob, and the other end of the proximal stop tube is axially limited and circumferentially rotatably installed inside the outer tube handle; an axial sliding groove extending axially and radially penetrating the proximal stop tube is provided on the tube wall of the proximal stop tube located inside the outer tube handle; The distal end of the distal stop tube is fixed or integrally connected to the proximal end of the middle tube, and at least part of the distal stop tube is axially slidably arranged inside the proximal stop tube; a limit protrusion is fixed or integrally connected to the outer tube wall of the distal stop tube; The rotating sleeve is installed inside the outer tube handle in an axially limited and circumferentially rotatable manner, and the rotating sleeve is sleeved on the outside of the proximal stop tube. A spiral groove is provided on the peripheral wall of the rotating sleeve, which rotates around the rotating sleeve and spirally extends from one end of the rotating sleeve to the other end, and the spiral groove penetrates the rotating sleeve in the radial direction of the rotating sleeve. The limiting protrusion of the distal limiting tube passes through the axial sliding groove of the proximal limiting tube and the spiral groove of the rotating sleeve; Rotating the middle tube knob relative to the outer tube handle can drive the proximal limit tube to rotate, causing the limit protrusion to rotate along the spiral groove while sliding axially, thereby causing the middle tube to perform a screw-in or screw-out movement relative to the outer tube handle and the outer tube.

[0015] The embodiments of the present invention can achieve at least the following beneficial effects: The above-mentioned implant capture and removal device provided in the embodiment of the present invention is simple to operate, and because at least three sets of claw arms are provided, which cooperate with the claw handles and the push-pull mechanism to capture the implant in a grabbing manner, it is not limited by the shape and specifications of the implant, and the implant is not easy to fall off during the removal process. Different types of implants can be quickly located and removed from the patient's body, thereby improving surgical efficiency and having high operational reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic axonometric diagram of the overall structure of an implant capture and retrieval device provided in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of the local structure of area A in the middle; Figure 3 for Figure 1 Partial cross-sectional view of area A in the middle; Figure 4 for Figure 1 A magnified view of the local structure of the middle B area; Figure 5 A structural isometric view of a claw arm provided at the distal end of the inner tube in the implant capture and retrieval device provided in an embodiment of the present invention; Figure 6 A schematic diagram of the axonometric structure of a capture clip in the implant capture and retrieval device provided in an embodiment of the present invention; Figure 7 An axial cross-sectional view of the overall structure of the implant capture and retrieval device provided by an embodiment of the present invention; Figure 8 for Figure 7 A magnified view of the local structure of the middle C area; Fig. 9 for Figure 7 A magnified view of the local structure of area D in the middle.

[0018] Icons: 11-outer tube handle; 111-middle tube knob; 12-outer tube; 13-middle tube; 131-cutter; 1311-proximal segment; 1312-inclined segment; 1313-distal segment; 13101-distal blade; 13102-side blade; 21-inner tube handle; 211-claw handle; 22-inner tube; 221-main body inner tube section; 222-distal inner tube section; 223-tube seat; 23-claw arm; 231-fixed arm; 232-hinged arm; 233-gripping arm; 24-capturing clip; 241-clip body; 2401-clip inner surface; 2402-clip outer surface; 242-mounting block; X-length direction; Y-width direction; Z-thickness direction; 243-spring mounting part; 25-clip spring; 31-central hinge block; 311-connecting convex part; 32-pushing and pulling member; 321-stopper; 33-reset spring; 34-transmission rod; 341-circumferential limiting convex part; 4-screw-in and screw-out transmission assembly; 41-proximal stop tube; 411-axial slide groove; 42-distal stop tube; 421-stop protrusion; 43-rotating sleeve; 431-spiral groove; 5-bending handle; 51-bending knob; 52-bending screw; 53-bending slider; 531-slider protrusion. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that: Unless otherwise clearly specified and limited, the terms "disposed", "installed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The orientation or positional relationship indicated by the terms "proximal", "distal", "circumferential", "axial", "radial", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the following, some embodiments of the present invention are described in detail with reference to the accompanying drawings, with the end of the medical device close to the operator during surgery being the proximal end of the medical device and the end of the medical device entering the patient's blood vessel being the distal end of the medical device (the front end of the medical device is the distal end and the rear end of the medical device is the proximal end). In the absence of conflict, the features of the following embodiments and the optional embodiments in the embodiments can be combined with each other.

[0025] This embodiment provides an implant capture and retrieval device, referring to Figures 1 to 9The implant capture and removal device includes an outer tube assembly and an inner tube assembly. The outer tube assembly at least includes an outer tube handle 11 and an outer tube 12 whose proximal end is fixedly connected to the inner part of the outer tube handle 11. The inner tube assembly at least includes an inner tube 22, an inner tube handle 21, a claw handle 211 and a push-pull mechanism; the proximal end of the inner tube 22 is fixedly connected to the inner tube handle 21, and the distal end of the inner tube 22 is hinged with at least three groups of claw arms 23, which are arranged at intervals along the circumference of the inner tube 22, for example but not limited to Figure 1 , Figure 4 , Figure 5 and Figure 7 , Fig. 9 As shown, four groups of claw arms 23 are arranged at intervals along the circumference of the inner tube 22; the claw handle 211 is movably installed on the inner tube handle 21, one end of the push-pull mechanism is transmission-connected to each group of claw arms 23, and the other end of the push-pull mechanism is connected to the claw handle 211; the claw handle 211 is movable relative to the inner tube handle 21, and the push-pull mechanism can drive the push-pull mechanism to control the distal ends of these claw arms 23 to open outward or close inward along the radial direction of the inner tube 22, and the claw handle 211 can be locked to the inner tube handle 21 to lock the opening and closing state of these claw arms 23. The inner tube 22 passes through the outer tube 12, and the inner tube handle 21 is arranged on the proximal side of the outer tube handle 11, and the inner tube handle 21 can slide relative to the outer tube handle 11 in the axial direction, so that these claw arms 23 extend or retract to the distal end of the outer tube 12.

[0026] When an implant that has not yet been severely endothelialized with the patient's organ tissue or has been separated from the patient's organ tissue is removed from the patient's body through an implant intervention surgery: The distal ends of the outer tube 12 and the inner tube 22 of this embodiment are delivered to the end of the implant along the guide wire, and the outer tube handle 11 is withdrawn in the proximal direction relative to the inner tube handle 21 to withdraw the outer tube 12 relative to the inner tube 22 (or, the inner tube handle 21 is pushed forward in the distal direction relative to the outer tube handle 11 to push the inner tube 22 forward relative to the outer tube 12), so that the claw arms 23 at the distal end (front end) of the inner tube 22 are exposed from the distal end (front end) of the outer tube 12; then, the claw handle 211 is moved relative to the inner tube handle 21, and the push-pull mechanism is driven to control the distal ends of these claw arms 23 to move along the inner tube handle 21. The radial outward opening and inward closing of the tube 22 allows the claw arms 23 to grasp and capture the ends of the implant. Thereafter, the claw handle 211 is locked to the inner tube handle 21, and the outer tube handle 11 is pushed forward in the distal direction relative to the inner tube handle 21 to push the outer tube 12 forward relative to the inner tube 22 (or, the inner tube handle 21 is withdrawn in the proximal direction relative to the outer tube handle 11 to withdraw the inner tube 22 relative to the outer tube 12), so that the claw arms 23 and at least the grasped ends of the implant are accommodated inside the outer tube 12, and the implant capture and retrieval device is then taken out of the patient's body.

[0027] The implant capture and removal device provided in this embodiment is easy to operate, and because at least three groups of claw arms 23 are provided, in cooperation with the claw handles 211 and the push-pull mechanism, the implant is captured in a grabbing manner. Therefore, it is not limited by the shape and specifications of the implant, and the implant is not easy to fall off during the removal process. Different types of implants can be quickly located and removed from the patient's body, thereby improving surgical efficiency and having high operational reliability.

[0028] Continue to refer to Figures 1 to 9 In an optional implementation scheme of the present embodiment, the inner tube 22 includes a main body inner tube section 221 and a distal inner tube section 222 which are fixed or integrally connected; the push-pull mechanism includes a central hinge block 31 and a push-pull member 32, and the central hinge block 31 is suspended on the distal side of the distal inner tube section 222; these claw arms 23 are arranged circumferentially around the central hinge block 31. Each group of claw arms 23 includes a respective fixed arm 231, a hinge arm 232 and a clamping arm 233; the side of each clamping arm 233 facing the axis of the distal inner tube section 222 is the respective inner side, and the side away from the axis of the distal inner tube section 222 is the respective outer side, and each clamping arm 233 is in a curved shape protruding from the respective inner side to the respective outer side; the proximal end of the fixed arm 231 is fixedly connected to the distal surface edge area of ​​the distal inner tube section 222; The proximal end of the articulated arm 232 is hinged to the distal end of the fixed arm 231; the distal end of the clamping arm 233 is suspended in the air, the proximal end of the clamping arm 233 is hinged to the connecting protrusion 311 provided on the outer wall of the central hinge block 31, and the part of the clamping arm 233 close to the proximal end is hinged to the distal end of the articulated arm 232; the push-pull member 32 passes through the inner tube 22, the distal end of the push-pull member 32 is fixedly connected to the central hinge block 31, and the proximal end of the push-pull member 32 is fixedly or transmission-connected to the claw handle 211. The movable claw handle 211 relative to the inner tube handle 21 can, under a first working condition, pull the push-pull member 32 in the proximal direction relative to the inner tube 22 so that the distal ends of the clamping arms 233 of these claw arms 23 are closed radially inward along the distal inner tube segment 222; and, under a second working condition, push the push-pull member 32 in the distal direction relative to the inner tube 22 so that the distal ends of the clamping arms 233 of these claw arms 23 are opened radially outward along the distal inner tube segment 222.

[0029] In the above structure, an optional structural form of the claw arm 23 in this embodiment is listed. In this optional structural form, the claw arm 23 includes a fixed arm 231, an articulated arm 232 and a clamping arm 233. The opening and closing of multiple claw arms 23 are controlled by a central hinge block 31 hinged to the clamping arm 233, and the clamping arm 233 is curved and convex from the inside to the outside. When these claw arms 23 are closed, the ends of the implant can be gathered in a "drum-shaped" space surrounded by multiple clamping arms 233. On the one hand, a larger implant end accommodating space is provided to accommodate implants of different shapes and sizes. On the other hand, after the claw arms 23 are closed, the force applied by the distal ends of each clamping arm 233 to the implant ends is increased in the radial direction of the implant, thereby greatly improving the clamping reliability of the implant.

[0030] In this embodiment, the push-pull member 32 may be a hard rod structure or a relatively soft wire structure. Figures 1 to 9 In some optional implementations of the present embodiment, the push-pull member 32 is a push-pull wire, and the push-pull mechanism includes not only a central hinge block 31 and a push-pull member 32, but also a reset spring 33; the inner tube 22 also includes a tube seat 223, the distal end of the inner tube segment 221 of the main body is connected to the proximal end of the tube seat 223, the proximal end of the distal inner tube segment 222 is connected to the distal end of the tube seat 223, and an axial through hole is provided inside the tube seat 223; an end plate is fixed or integrally connected to the distal end surface of the distal inner tube segment 222, and an end plate through hole is provided in the middle of the end plate; the push-pull wire passes through the inner tube segment 221 of the main body, the axial through hole of the tube seat 223 and the end plate through hole of the distal inner tube segment 222 in turn, and the push-pull wire is located inside the distal inner tube segment 222 and is fixedly connected to a stopper 321 close to the end plate. The return spring 33 is arranged inside the distal inner tube section 222 and between the tube seat 223 and the stop block 321; the return spring 33 is configured to always have a movement tendency of pushing the stop block 321 in the distal direction relative to the distal inner tube section 222, so that the distal ends of the clamping arms 233 of these claw arms 23 open radially outward along the distal inner tube section 222; pulling the push-pull wire in the proximal direction relative to the inner tube 22 can drive the stop block 321 to compress the return spring 33 in the proximal direction, so that the distal ends of the clamping arms 233 of these claw arms 23 close radially inward along the distal inner tube section 222.

[0031] The specific structural form of the claw handle 211 includes but is not limited to making the claw handle 211 axially slidably installed on the inner tube handle 21 (pushing the claw handle 211 forward or pulling it backward pushes or retracts the push-pull member 32), or, in some optional implementations of the present embodiment, the claw handle 211 is a knob handle, with the axial direction of the inner tube 22 as the axial direction of the inner tube handle 21, the claw handle 211 is coaxial with the inner tube handle 21, is axially limited to the inner tube handle 21, and can rotate circumferentially relative to the inner tube handle 21; the push-pull member 32 is a push-pull wire or a push-pull rod; the push-pull mechanism also includes a transmission rod 34, which is circumferentially limited and axially slidably installed inside the inner tube handle 21 (the specific installation method includes but is not limited to the following: Figure 3 As shown, an axially extending sliding groove is provided on the inner wall of the inner tube handle 21, and a circumferential limiting protrusion 341 is provided on the outer circumferential wall of the transmission rod 34, and the circumferential limiting protrusion 341 is slidably installed in the sliding groove), the claw handle 211 is sleeved on the outside of the transmission rod 34 and is threadedly connected to the transmission rod 34; the proximal end of the push-pull member 32 is fixedly connected to the transmission rod 34; when the claw handle 211 is rotated relative to the inner tube handle 21, since the claw handle 211 is axially limited to the inner tube handle 21, and the transmission rod 34 is circumferentially limited and axially slidably installed on the inner tube handle 21, the claw handle 211 drives the transmission rod 34 axially forward or backward relative to the inner tube handle 21 through threaded transmission, so as to realize the function of pushing or pulling the push-pull member 32 forward or backward. This structure is easy to operate and has high reliability.

[0032] In addition, in order to further strengthen the pressure exerted on the implant in the radial direction when the plurality of claw arms 23 are closed, thereby further strengthening the gripping reliability of the implant, in some optional implementations of this embodiment, such as Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Fig. 9As shown, each group of claw arms 23 also includes a capture clip 24; the capture clip 24 includes a clip body 241 and a mounting block 242; the clip body 241 has a length direction X, a width direction Y and a thickness direction Z, and the two opposite sides of the clip body 241 in the thickness direction Z are the clip inner surface 2401 and the clip outer surface 2402, respectively, and at least the edge line of the clip inner surface 2401 on the cross section formed by cutting the clip body 241 along the width direction Y and the thickness direction Z is in the middle. The outer surface 2402 of the clip is convex to the arc line in the direction of the clip outer surface 2402; there is no specific restriction on the edge line of the clip outer surface 2402 on the cross section formed by the clip body 241 cut along the width direction Y and the thickness direction Z, but for the convenience of manufacturing and reducing the radial size of the distal side structure of the inner tube 22 during intravascular delivery, it is preferred that the edges of the clip outer surface 2402 and the clip inner surface 2401 on the cross section formed by the clip body 241 cut along the width direction Y and the thickness direction Z are parallel to each other. The mounting block 242 is fixed or integrally connected to the clip outer surface 2402, and the mounting block 242 is rotatably mounted on the distal end of the clamping arm 233 through the hinge axis; wherein, the edge line of the clip inner surface 2401 on the cross section formed by the capture clip 24 cut along the width direction Y and the thickness direction Z is parallel to the circumferential line of the distal inner tube section 222, and the extension direction of the hinge axis is parallel to the tangent line of the circumference line of the distal inner tube section 222.

[0033] In this structure, by hingedly connecting the capture clip 24 at the distal end of the clamping arm 233, the capture clip 24 can be used to adaptively clamp the circumference of the implant, thereby increasing the contact area between the clamping arm 233 and the circumference of the implant when clamping the end of the implant, and increasing the friction between the two to further prevent it from falling off. In addition, the curved surface design of the inner surface 2401 of the capture clip 24 can better accommodate the implant and achieve a more stable and reliable clamping effect.

[0034] In order to further improve the clamping efficiency, in the above-mentioned embodiment of providing a capturing clip 24, it is further optional that each group of claw arms 23 also includes a clip spring 25, and a spring mounting portion 243 is also provided on the outer surface 2402 of the clip. One end of the clip spring 25 is connected to the spring mounting portion 243, and the other end is connected to the clamping arm 233. The clip spring 25 is configured so that the capturing clip 24 always has a movement tendency to rotate around the aforementioned hinge axis relative to the clamping arm 233 to an initial state; in the initial state, the clip body 241 is located on one side of the axis of the clamping arm 233 toward the distal inner tube section 222, and the inner surface 2401 of the clip is an inclined surface with the distal end located on the outside of the proximal end, and the inclined surface can be used as a guide surface during grasping to quickly pick up the implant.

[0035] In addition, in view of the prior art, after the implant is implanted into the patient's body for a period of time, endothelialization often occurs between the implant and the patient's organ tissue. At this time, when the implant is removed by an implant intervention method, the implant will pull the patient's organ tissue, resulting in high difficulty in removal and great trauma to the patient. The present embodiment makes the following further improvements: Continue to refer to Figures 1 to 9 In some optional implementations of the present embodiment, the outer tube assembly further includes a middle tube 13, a middle tube knob 111 and a screw-in and screw-out transmission assembly 4; the axial direction of the outer tube 12 is the axial direction of the outer tube handle 11, and the middle tube knob 111 is installed on the outer tube handle 11 in a manner of being coaxial with the outer tube handle 11, being axially limited to the outer tube handle 11, and being able to rotate circumferentially relative to the outer tube handle 11. The screw-in and screw-out transmission assembly 4 is arranged inside the outer tube handle 11, the middle tube 13 passes through the outer tube 12, and the proximal end of the middle tube 13 is connected to the middle tube knob 111 through the screw-in and screw-out transmission assembly 4; at least one groove is arranged on the distal end surface of the middle tube 13, which radially penetrates the tube wall of the middle tube 13, and the remaining part of the distal end of the middle tube 13 except the groove forms a cutter 131, and each cutter 131 has a distal blade 13101 and a side blade 13102. By rotating the middle tube knob 111 relative to the outer tube handle 11, the advance and retreat transmission assembly 4 can be driven to rotate the middle tube 13 relative to the outer tube 12 circumferentially while sliding axially, so that the cutter 131 is extended out of the outer tube 12 in a distal direction, or retracted in a proximal direction. The inner tube 22 passes through the middle tube 13, and the inner tube handle 21 can slide axially relative to the outer tube handle 11, so that the claw arms 23 are extended or retracted to the distal end of the middle tube 13.

[0036] When in use, for implants that have already endothelialized with the patient's organ tissue, the cutter 131 can be first screwed out of the outer tube 12 in the distal direction, so that the cutter 131 can be used to cut and separate the implant from the surrounding human tissue, and then the cutter 131 can be screwed back into the middle tube 13 in the proximal direction, and the implant can be grabbed and captured by the claw arm 23 at the distal end of the inner tube 22, thereby solving the above-mentioned problem.

[0037] In this optional embodiment, further optionally, the cutter 131 includes a proximal section 1311, an inclined section 1312 and a distal section 1313 connected in sequence from the proximal end to the distal end of the middle tube 13, and the inclined section 1312 gradually inclines radially outward from the proximal end to the distal end of the distal section 1313 to avoid the claw arm 23, and the distal blade 13101 and the side blade 13102 are arranged in the distal area of ​​the distal section 1313.

[0038] There are many specific configuration forms for the above-mentioned advance and retreat transmission assembly 4, such as but not limited to a combination structure of a screw and a slider or other structures. In order to improve the transmission stability, optionally, Figure 3As shown, the above-mentioned advance and retreat transmission assembly 4 includes a proximal stop tube 41, a distal stop tube 42 and a rotating sleeve 43; one end of the proximal stop tube 41 is integrally connected or fixedly connected or axially and circumferentially limited to the middle tube knob 111, and the other end of the proximal stop tube 41 is axially limited and circumferentially rotatably installed inside the outer tube handle 11; the proximal stop tube 41 is provided with an axial groove 411 extending axially and radially penetrating the proximal stop tube 41 on the tube wall inside the outer tube handle 11. The distal end of the distal stop tube 42 is fixed or integrally connected to the proximal end of the middle tube 13, and at least part of the distal stop tube 42 is axially slidably penetrated inside the proximal stop tube 41; a limit protrusion 421 is fixed or integrally connected to the wall of the outer tube 12 of the distal stop tube 42. The rotating sleeve 43 is installed inside the outer tube handle 11 in an axially limited and circumferentially rotatable manner, and the rotating sleeve 43 is sleeved on the outside of the proximal stop tube 41. The circumferential wall of the rotating sleeve 43 is provided with a spiral groove 431 that rotates around the rotating sleeve 43 and spirally extends from one end of the rotating sleeve 43 to the other end. The spiral groove 431 penetrates the rotating sleeve 43 in the radial direction of the rotating sleeve 43. The limiting protrusion 421 of the distal stop tube 42 passes through the axial sliding groove 411 of the proximal stop tube 41 and the spiral groove 431 of the rotating sleeve 43. Rotating the middle tube knob 111 relative to the outer tube handle 11 can drive the proximal stop tube 41 to rotate, and the limiting protrusion 421 rotates along the spiral groove 431 while sliding axially, thereby causing the middle tube 13 to rotate inward or outward relative to the outer tube handle 11 and the outer tube 12.

[0039] In addition, in order to make the present embodiment better adapt to the bending state of the blood vessels, avoid the problem that the device is difficult to pass through the patient's blood vessels when the bending sheath is additionally used, and further simplify the surgical steps, in some optional implementations of the present embodiment, a bending adjustment component can also be provided on the outer tube handle 11 and the inner tube handle 21, respectively, and the bending adjustment component respectively includes a bending adjustment handle 5 connected to each handle, a bending adjustment knob 51 coaxially and rotatably mounted on the bending adjustment handle 5, a bending adjustment screw 52 arranged inside the bending adjustment handle 5 and fixedly connected to the bending adjustment knob 51, and a threaded bending adjustment screw 52 arranged inside the bending adjustment handle 5 and fixedly connected to the bending adjustment screw 52. A bending adjustment slider 53 is sleeved on the outside of the bending adjustment screw 52, ​​and a bending adjustment wire is connected to the bending adjustment slider 53 at one end and connected to the distal end of the outer tube 12 or the inner tube 22 at the other end. A slider protrusion 531 is provided on the outer circumference of the bending adjustment slider 53, and a slide rail extending axially along the bending adjustment screw 52 is provided on the inner circumference of the bending adjustment handle 5. The slider protrusion 531 is matched with the slide rail in a concave-convex manner. By rotating the bending adjustment knob 51 relative to the bending adjustment handle 5, the bending adjustment slider 53 slides along the axial direction of the bending adjustment screw 52, ​​thereby pulling or releasing the traction wire to control the distal bending of the outer tube 12 and / or the inner tube 22.

[0040] Finally, it should be noted that the above embodiments and their optional implementation modes in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned optional implementation modes, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, it is emphasized again that the features of the embodiments in this specification and the optional implementation modes in the embodiments can be combined with each other without conflict.

Claims

1. An implant capture and retrieval device, characterized in that: comprising an outer tube assembly and an inner tube assembly; The outer tube assembly comprises an outer tube handle (11) and an outer tube (12) whose proximal end is fixedly connected to the interior of the outer tube handle (11); The inner tube assembly comprises an inner tube (22), an inner tube handle (21), a claw handle (211) and a push-pull mechanism; the proximal end of the inner tube (22) is fixedly connected to the inner tube handle (21), the distal end of the inner tube (22) is hinged with at least three groups of claw arms (23), and the at least three groups of claw arms (23) are arranged at intervals along the circumference of the inner tube (22); the claw handle (211) is movably mounted on the inner tube handle (21), and one end of the push-pull mechanism is drivingly connected to each of the claw arms (23). The claw arms (23) are grouped together, and the other end of the push-pull mechanism is connected to the claw handle (211); the claw handle (211) is movable relative to the inner tube handle (21), and can drive the push-pull mechanism to control the distal ends of the at least three groups of claw arms (23) to open outward or close inward along the radial direction of the inner tube (22); the claw handle (211) can be locked to the inner tube handle (21) to lock the open and closed states of the at least three groups of claw arms (23); The inner tube (22) passes through the outer tube (12), the inner tube handle (21) is arranged on the proximal side of the outer tube handle (11), and the inner tube handle (21) can slide axially relative to the outer tube handle (11) so that the at least three groups of claw arms (23) extend or retract to the distal end of the outer tube (12).

2. The implant capture and retrieval device according to claim 1, characterized in that: The inner tube (22) comprises a main body inner tube section (221) and a distal inner tube section (222) that are fixed or integrally connected; The push-pull mechanism comprises a central hinge block (31) and a push-pull member (32); the central hinge block (31) is suspended on the distal end side of the distal inner tube section (222); The at least three groups of claw arms (23) are arranged circumferentially around the central hinge block (31); each group of the claw arms (23) comprises a respective fixed arm (231), a hinge arm (232) and a clamping arm (233); the side of each clamping arm (233) facing the axis of the distal inner tube section (222) is the respective inner side, and the side away from the axis of the distal inner tube section (222) is the respective outer side, and each clamping arm (233) is respectively arranged from the respective inner side to the respective outer side. The proximal end of the fixed arm (231) is fixedly connected to the edge area of ​​the distal surface of the distal inner tube section (222); the proximal end of the articulated arm (232) is hinged to the distal end of the fixed arm (231); the distal end of the clamping arm (233) is suspended in the air, the proximal end of the clamping arm (233) is hinged to a connecting protrusion (311) provided on the outer wall of the central articulated block (31), and the portion of the clamping arm (233) close to the proximal end is hinged to the distal end of the articulated arm (232); The push-pull member (32) passes through the inner tube (22), the distal end of the push-pull member (32) is fixedly connected to the central hinge block (31), and the proximal end of the push-pull member (32) is fixedly or transmission-connected to the claw handle (211); The claw handle (211) is movable relative to the inner tube handle (21) so that, under a first working condition, the push-pull member (32) can be pulled in a proximal direction relative to the inner tube (22) so that the distal ends of the clamping arms (233) of the at least three groups of claw arms (23) are closed radially inwardly along the distal inner tube section (222); and, under a second working condition, the push-pull member (32) can be pushed in a distal direction relative to the inner tube (22) so that the distal ends of the clamping arms (233) of the at least three groups of claw arms (23) are opened radially outwardly along the distal inner tube section (222).

3. The implant capture and retrieval device according to claim 2, characterized in that: The push-pull member (32) is a push-pull wire, and the push-pull mechanism further includes a return spring (33); The inner tube (22) further comprises a tube seat (223); the distal end of the main body inner tube section (221) is connected to the proximal end of the tube seat (223); the proximal end of the distal inner tube section (222) is connected to the distal end of the tube seat (223); an axial through hole is provided inside the tube seat (223); an end plate is fixed or integrally connected to the distal end surface of the distal inner tube section (222); an end plate through hole is provided in the middle of the end plate; The push-pull wire passes through the main body inner tube section (221), the axial through hole of the tube seat (223) and the end plate through hole of the distal inner tube section (222) in sequence, and a stopper (321) is fixedly connected to the push-pull wire at a position inside the distal inner tube section (222) and close to the end plate; The return spring (33) is arranged inside the distal inner tube section (222) and between the tube seat (223) and the stopper (321); the return spring (33) is configured to always have a movement tendency to push the stopper (321) in a distal direction relative to the distal inner tube section (222), so as to make the distal ends of the clamping arms (233) of the at least three groups of claw arms (23) open outwardly along the radial direction of the distal inner tube section (222); Pulling the push-pull wire in the proximal direction relative to the inner tube (22) can drive the stopper (321) to compress the return spring (33) in the proximal direction, thereby causing the distal ends of the clamping arms (233) of the at least three groups of claw arms (23) to close radially inwardly along the distal inner tube section (222).

4. The implant capture and retrieval device according to claim 2, characterized in that: The claw handle (211) is a knob handle, with the axial direction of the inner tube (22) being the axial direction of the inner tube handle (21); the claw handle (211) is coaxial with the inner tube handle (21), is axially limited to the inner tube handle (21), and is circumferentially rotatable relative to the inner tube handle (21); The push-pull member (32) is a push-pull wire or a push-pull rod; the push-pull mechanism also includes a transmission rod (34), the transmission rod (34) is circumferentially limited and axially slidably installed inside the inner tube handle (21), the claw handle (211) is sleeved on the outside of the transmission rod (34) and is threadedly connected to the transmission rod (34); the proximal end of the push-pull member (32) is fixedly connected to the transmission rod (34).

5. The implant capture and retrieval device according to claim 2, characterized in that: Each group of the claw arms (23) further comprises a capture clip (24); The capture clip (24) comprises a clip body (241) and a mounting block (242); The clip body (241) has a length direction (X), a width direction (Y) and a thickness direction (Z), and the two opposite surfaces on the thickness direction (Z) of the clip body (241) are respectively a clip inner surface (2401) and a clip outer surface (2402), and at least the edge line of the clip inner surface (2401) on a cross section formed by cutting the clip body (241) along the width direction (Y) and the thickness direction (Z) is an arc line with the middle part convex toward the clip outer surface (2402); The mounting block (242) is fixed or integrally connected to the outer surface (2402) of the clip, and the mounting block (242) is rotatably mounted on the distal end of the clamping arm (233) via a hinge axis; wherein the edge line of the inner surface (2401) of the clip on the cross section obtained by cutting the capturing clip (24) along the width direction (Y) and the thickness direction (Z) is parallel to the circumferential line of the distal inner tube section (222), and the extension direction of the hinge axis is parallel to the tangent line of the circumferential line of the distal inner tube section (222).

6. The implant capture and retrieval device according to claim 5, characterized in that: Each group of the claw arms (23) further comprises a clip spring (25), and a spring mounting portion (243) is further provided on the outer surface (2402) of the clip, one end of the clip spring (25) is connected to the spring mounting portion (243), and the other end is connected to the clamping arm (233), and the clip spring (25) is configured so that the capturing clip (24) always has a movement tendency to rotate around the hinge axis relative to the clamping arm (233) to an initial state; in the initial state, the clip body (241) is located on one side of the axis of the clamping arm (233) toward the distal inner tube section (222), and the inner surface (2401) of the clip is an inclined surface with the distal end located on the outside of the proximal end.

7. The implant capture and retrieval device according to claim 5, characterized in that: The edges of the clip outer surface (2402) and the clip inner surface (2401) on the cross-section formed by cutting the clip body (241) along the width direction (Y) and the thickness direction (Z) are parallel to each other.

8. The implant capture and retrieval device according to any one of claims 1 to 7, characterized in that: The outer tube assembly further comprises a middle tube (13), a middle tube knob (111) and a rotation-advance and rotation-retractable transmission assembly (4); The axial direction of the outer tube (12) is the axial direction of the outer tube handle (11); the middle tube knob (111) is mounted on the outer tube handle (11) in a manner coaxial with the outer tube handle (11), axially limited to the outer tube handle (11), and circumferentially rotatable relative to the outer tube handle (11); the advance and retreat transmission assembly (4) is arranged inside the outer tube handle (11); the middle tube (13) passes through the outer tube (12), and the proximal end of the middle tube (13) is connected to the middle tube knob (111) via the advance and retreat transmission assembly (4); a radially extending end surface of the distal end of the middle tube (13) is provided. At least one groove is formed through the wall of the middle tube (13); the remaining portion of the distal end of the middle tube (13) except the groove forms a cutter (131), and the cutter (131) has a distal blade (13101) and a side blade (13102); the middle tube knob (111) is rotated relative to the outer tube handle (11), so as to drive the rotation-advance and rotation-retract drive assembly (4) to drive the middle tube (13) to rotate circumferentially relative to the outer tube (12) and slide axially at the same time, so that the cutter (131) is rotationally extended out of the outer tube (12) toward the distal end, or is rotationally retracted into the outer tube (12) toward the proximal end; The inner tube (22) passes through the middle tube (13), and the inner tube handle (21) is capable of axially sliding relative to the outer tube handle (11), so that the at least three groups of claw arms (23) are extended or retracted to the distal end of the middle tube (13).

9. The implant capture and retrieval device according to claim 8, characterized in that: The cutting knife (131) comprises a proximal section (1311), an inclined section (1312) and a distal section (1313) which are connected in sequence from the proximal end to the distal end of the middle tube (13); the inclined section (1312) gradually inclines outwardly along the radial direction of the distal section (1313) from the proximal end to the distal end; and the distal blade (13101) and the side blade (13102) are arranged in the distal region of the distal section (1313).

10. The implant capture and retrieval device according to claim 8, characterized in that: The advance and retreat type transmission assembly (4) comprises a proximal stop tube (41), a distal stop tube (42) and a rotating sleeve (43); One end of the proximal stop tube (41) is integrally connected or fixedly connected or axially and circumferentially limit-connected to the middle tube knob (111), and the other end of the proximal stop tube (41) is axially limit-connected and circumferentially rotatably mounted inside the outer tube handle (11); an axial sliding groove (411) extending axially and radially penetrating the proximal stop tube (41) is provided on the tube wall of the proximal stop tube (41) located inside the outer tube handle (11); The distal end of the distal limiting tube (42) is fixed or integrally connected to the proximal end of the middle tube (13), and at least a portion of the distal limiting tube (42) is axially slidably disposed inside the proximal limiting tube (41); a limiting protrusion (421) is fixed or integrally connected to the wall of the outer tube (12) of the distal limiting tube (42); The rotating sleeve (43) is axially limited and circumferentially rotatably installed inside the outer tube handle (11), and the rotating sleeve (43) is sleeved on the outside of the proximal limiting tube (41), and a spiral groove (431) is provided on the peripheral wall of the rotating sleeve (43), which rotates around the rotating sleeve (43) and spirally extends from one end of the rotating sleeve (43) to the other end, and the spiral groove (431) penetrates the rotating sleeve (43) along the radial direction of the rotating sleeve (43); The limiting protrusion (421) of the distal limiting tube (42) passes through the axial sliding groove (411) of the proximal limiting tube (41) and the spiral groove (431) of the rotating sleeve (43); By rotating the middle tube knob (111) relative to the outer tube handle (11), the proximal limit tube (41) can be driven to rotate, causing the limit protrusion (421) to rotate along the spiral groove (431) and slide axially at the same time, thereby causing the middle tube (13) to perform a screwing-in or screwing-out movement relative to the outer tube handle (11) and the outer tube (12).

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