Thread trimmer

Abstract

The present application provides a thread cutter, which mainly includes an outer tube for positioning sutures, a core tube inserted in the outer tube, and a thread cutting assembly respectively connected to the outer tube and the core tube, wherein the core tube can reciprocate along the axial direction of the outer tube and drive the thread cutting assembly to switch between a non-active state and an active state to cut the sutures. The thread cutter of the present application can thereby provide a good cutting force and has the advantage of being small in size.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of medical devices, and in particular to a wire cutter. Background Art

[0002] During interventional surgery, since the doctor's operating position is far away from the target position in the patient's body, a wire cutting device needs to be delivered to the target position in the patient's body via a catheter to perform a cutting operation on the wire (e.g., suture) at the target position. However, the provision of the catheter limits the design size of the wire cutting device.

[0003] In view of this, there is an urgent need for a wire cutter with a small size and improved cutting force. Summary of the invention

[0004] In view of the above problems, the present application provides a wire cutter to overcome the above problems or at least partially solve the above problems.

[0005] An embodiment of the present application provides a thread cutter, which includes: an outer tube, which is used to position a suture; a core tube, which can be movably inserted into the outer tube; and a thread cutting assembly, which connects the outer tube and the core tube; wherein the core tube can reciprocate along the axial direction of the outer tube and drive the thread cutting assembly to switch between an inactive state and an active state to cut the suture.

[0006] Optionally, the outer tube further comprises a tube body and an assembly structure, wherein the assembly structure extends along the axial direction of the tube body and is used for pivotally connecting the thread cutting assembly and positioning the suture.

[0007] Optionally, the assembly structure includes two extension arms, which are arranged on opposite sides of the tube body and extend along the axial direction of the tube body to define a U-shaped groove connected to the tube body; a positioning portion, which is arranged on the two extension arms and is used to define a suture path, so that the suture arranged on the positioning portion extends along the suture path in the U-shaped groove; and a pivot member, which is used to pivot the thread cutting assembly to the two extension arms so that the thread cutting assembly is suspended in the U-shaped groove, and the axial direction of the thread cutting assembly intersects with the suture path.

[0008] Optionally, the wire cutter also includes a linkage assembly, and the wire cutting assembly also includes: a first scissor arm and a second scissor arm; wherein the first scissor arm and the second scissor arm are pivotally connected by the pivot member; and wherein the first scissor arm and the second scissor arm are movably connected to the core tube via the linkage assembly; when the core tube moves axially toward the proximal end of the outer tube, the first scissor arm can be driven to pivot relative to the second scissor arm so that the wire cutting assembly switches from the inactive state to the active state; when the core tube moves axially toward the distal end of the outer tube, the first scissor arm can be driven to pivot in the opposite direction relative to the second scissor arm so that the wire cutting assembly switches from the active state to the inactive state.

[0009] Optionally, the wire cutter further comprises a locking structure which can be switched between a locked state and an unlocked state, wherein when the locking structure is in the locked state, it can respectively abut the outer tube and the core tube to limit the movement of the core tube relative to the outer tube, thereby maintaining the wire cutting assembly in the active state or the inactive state.

[0010] Optionally, the first scissors arm includes: a first blade portion and a first abutment portion; the second scissors arm includes: a second blade portion and a second abutment portion; wherein, when the thread cutting assembly is in the active state, the first blade portion and the second blade portion are in a closed state to perform a thread cutting operation; the first abutment portion and the second abutment portion are combined with each other to form an abutment structure, and the abutment structure can abut the suture extending along the suture path; when the thread cutting assembly is in the inactive state, the first blade portion and the second blade portion are in an open state, and the first abutment portion and the second abutment portion are separated from each other to dissociate the abutment structure, so that the suture abutting the abutment structure enters between the first blade portion and the second blade portion.

[0011] Optionally, the first abutting portion and the second abutting portion each include a notch provided at the end of the first scissor arm and the end of the second scissor arm.

[0012] Optionally, the thread trimmer assembly further comprises a limiting portion provided on the first scissor arm and / or the second scissor arm, for defining a maximum pivot angle of the first scissor arm relative to the second scissor arm.

[0013] Optionally, the wire cutter further comprises a guide structure, which is arranged on the first scissor arm and / or the second scissor arm and is respectively adjacent to the positioning portion and the abutment structure on the extension arm, and the guide structure is used to guide the suture located at the positioning portion to the abutment structure.

[0014] Optionally, the lead structure includes a groove provided on the first scissor arm and / or the second scissor arm.

[0015] Optionally, the distance between the two extension arms is smaller than the sum of the wall thicknesses of the first scissor arm and the second scissor arm.

[0016] Optionally, the first scissor arm and the second scissor arm are made of high carbon steel or high speed tool steel.

[0017] Optionally, the linkage assembly includes a first linkage member and a second linkage member, wherein the first linkage member is pivotally connected to the second linkage member and the second scissor arm; and the second linkage member is pivotally connected to the first scissor arm and the core tube.

[0018] Optionally, the outer tube and the core tube further have bending portions respectively, so that the outer tube and the core tube can be bent when subjected to external force.

[0019] It can be seen from the above technical solutions that the wire cutter of the embodiment of the present application can provide a better cutting effect, so as to facilitate the smooth execution of the operation.

[0020] Furthermore, the wire cutter of the embodiment of the present application has the advantages of simple operation and compact structure and size, and is particularly suitable for wire cutting operations in interventional surgeries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 and Figure 2 It is a schematic diagram of the structure of the thread cutter of the present application in different states;

[0023] Figure 3 for Figure 2 A partial structural diagram of the thread cutter state shown;

[0024] Figure 4 An exploded schematic diagram of the wire cutter of this application;

[0025] Figure 5 and Figure 6 This is a schematic diagram of an embodiment of the locking structure of the thread cutter of the present application.

[0026] Component number

[0027] 1: Thread trimmer;

[0028] 11: Suture;

[0029] 2: External pipe;

[0030] 20: Assembly structure;

[0031] 21: Pipe body;

[0032] 22: bending part;

[0033] 202: U-shaped groove;

[0034] 204: extension arm;

[0035] 205: positioning unit;

[0036] 2051: positioning hole;

[0037] 206: pivot member;

[0038] 2061: pivot axis;

[0039] 2062: pivoting portion;

[0040] 3: core tube;

[0041] 32: bending part;

[0042] 34: connection hole;

[0043] 4: Wire cutting assembly;

[0044] 40: abutment structure;

[0045] 42: first scissor arm;

[0046] 422: first blade portion;

[0047] 424: first abutting portion;

[0048] 426, 428: pivot joint;

[0049] 44: second scissor arm;

[0050] 442: second blade portion;

[0051] 444: second abutting portion;

[0052] 446: pivoting portion;

[0053] 46: limit part;

[0054] 5: Locking structure;

[0055] 51: Lock the body;

[0056] 52: outer tube locking piece;

[0057] 53: core tube locking piece;

[0058] 64: Lead structure

[0059] 7: linkage parts;

[0060] 71: first linkage;

[0061] 712, 714: pivoting portion;

[0062] 72: second linkage;

[0063] 721,722: pivot joint;

[0064] 73, 74, 75: connecting rod. DETAILED DESCRIPTION

[0065] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0066] The specific implementation of the embodiment of the present application will be further explained below in conjunction with the accompanying drawings of the embodiment of the present application.

[0067] The thread cutter 1 of the present application can be applied to the suture cutting operation in interventional surgery, but is not limited thereto and can also be applied to the thread cutting operation in other types of surgical procedures.

[0068] like Figure 1 and Figure 2 As shown, the wire cutter 1 of the present application mainly includes an outer tube 2 , a core tube 3 and a wire cutting assembly 4 .

[0069] In this embodiment, the outer tube 2 can be used to position the suture 11, the core tube 3 can be movably inserted into the outer tube 2, and the thread cutting assembly 4 is respectively connected to the outer tube 2 and the core tube 3.

[0070] The core tube 3 can reciprocate along the axial direction of the outer tube 2 and drive the thread cutting assembly 4 to switch between a non-active state and an active state to cut the suture 11 positioned on the outer tube 2 .

[0071] Optionally, the outer tube 2 and the core tube 3 further have bending portions 22 and 32, respectively, so that the outer tube 2 and the core tube 3 can be bent by external force, thereby facilitating the delivery of the wire cutter 1 to a target position in the patient's body via a catheter.

[0072] Optionally, the outer tube 2 may include a tube body 21 and an assembly structure 20, wherein the tube body 21 is used to penetrate the core tube 3, and the assembly structure 20 extends along the axial direction of the tube body 21 and is used to pivotally connect the thread cutting assembly 4 and position the suture 11 (refer to Figure 4 ).

[0073] Optionally, the assembly structure 20 may include two extension arms 204 , a positioning portion 205 , and a pivoting member 206 .

[0074] Please refer to Figure 4 The two extension arms 204 are disposed on opposite sides of the tube body 21 and extend along the axial direction of the tube body 21 to define a U-shaped groove 202 connected to the tube body 21 .

[0075] The positioning portions 205 are disposed on the two extension arms 204 to define a suture path, so that the suture threaded through the positioning portions 205 can extend along the suture path in the U-shaped groove 202 .

[0076] In this embodiment, the positioning portion 205 includes two positioning holes 2051 formed at corresponding positions of the two extension arms 204 to form a suture path radially penetrating the U-shaped groove 202 .

[0077] The pivoting member 206 is used to pivotally connect the thread cutting assembly 4 to the two extension arms 204 , so that the thread cutting assembly 4 is suspended in the U-shaped groove 202 , and the axial direction of the thread cutting assembly 4 intersects with the suture path in the U-shaped groove 202 .

[0078] In this embodiment, the pivot member 206 includes a pivot shaft 2061 and pivot portions 2062 formed on two extension arms 204. The pivot shaft 2061 can radially penetrate the thread cutting assembly 4 and be inserted into the two pivot portions 2062, so that the thread cutting assembly 4 is pivotally connected to the assembly structure 20, and the axial direction of the thread cutting assembly 4 is parallel to the axial direction of the U-shaped groove 202 (i.e., the outer tube 2), and intersects with the suture path in the U-shaped groove 202.

[0079] Optionally, the thread trimmer assembly 4 includes a first scissor arm 42 and a second scissor arm 44 , and the thread trimmer 1 further includes a linkage assembly 7 .

[0080] Optionally, the first scissor arm 42 and the second scissor arm 44 may be made of high carbon steel, high speed tool steel or other materials.

[0081] In this embodiment, the first scissor arm 42 (eg, via the pivot portion 426 ) and the second scissor arm 44 (eg, via the pivot portion 446 ) may be pivotally connected via the pivot member 206 (ie, the pivot shaft 2061 ).

[0082] In this embodiment, the first scissor arm 42 and the second scissor arm 44 are movably connected to the core tube 3 via a linkage assembly 7 .

[0083] Optionally, the linkage assembly 7 includes a first linkage member 71 and a second linkage member 32 .

[0084] In this embodiment, the first linkage member 71 is pivotally connected to the second linkage member 72 and the second scissor arm 44 , and the second linkage member 72 is pivotally connected to the first scissor arm 42 and the core tube 3 .

[0085] In this embodiment, the pivot portion 712 of the first linkage member 71 is pivotally connected to the second scissor arm 44 via the connecting rod 73 (please note that the pivot position (not shown) at which the second scissor arm 44 is pivoted to the first linkage member 71 is different from the pivot position (i.e., the pivot portion 446) at which the second scissor arm 44 is pivoted to the first scissor arm 42); the pivot portion 714 of the first linkage member 71 is pivotally connected to the pivot portion 721 of the second linkage member 72; furthermore, the pivot portion 722 of the second linkage member 72, the connecting rod 74, the pivot portion 428 of the first scissor arm 42, the connecting rod 75, and the connecting hole 34 at the top end of the core tube 2 are coaxially pivoted.

[0086] Specifically, when the core tube 3 moves axially toward the proximal end of the outer tube 2 (i.e., the end of the wire cutter 1 close to the operator), the first scissor arm 42 can be driven to pivot relative to the second scissor arm 44, so that the wire cutting assembly 4 is switched from the inactive state to the active state; conversely, when the core tube 3 moves axially toward the distal end of the outer tube 2 (i.e., the end of the wire cutter 1 away from the operator), the first scissor arm 42 can be driven to pivot in the opposite direction relative to the second scissor arm 44, so that the wire cutting assembly 4 is switched from the active state to the inactive state.

[0087] In this embodiment, the thread cutter 1 further includes a locking structure 5 (refer to Figure 5 and Figure 6 ), which can be switched between a locked state and an unlocked state, wherein when the locking structure 5 is in the locked state, it can abut the outer tube 2 and the core tube 3 respectively to limit the movement of the core tube 3 relative to the outer tube 2, so that the wire cutting assembly 4 is maintained in an active state or an inactive state.

[0088] In this embodiment, the locking structure 5 may include a locking body 51 which is arranged on the outer tube 2 and provides a core tube 3 to pass through, and an outer tube locking piece 52 and a core tube locking piece 53 inserted in the locking body 51. By adjusting the insertion position of the outer tube locking piece 52 and the core tube locking piece 53 relative to the locking body 51, the axial movement of the core tube 3 relative to the outer tube 2 can be restricted or released, so that the wire cutting assembly 4 is maintained in an active state or an inactive state.

[0089] In this embodiment, the locking structure 5 is mainly used to provide a locking function during the process of sending the thread trimmer 1 into the target position in the patient's body, so as to keep the thread trimmer assembly 4 in an active state.

[0090] It should be noted that the above-mentioned locking structure 5 is only an exemplary introduction, and those skilled in the art may also adopt other structural configurations to replace it. The present application does not limit this structural design, and it only needs to be able to maintain the wire cutting assembly 4 in an active state.

[0091] Please refer to Figure 4 In this embodiment, the first scissor arm 42 may include a first blade portion 422 and a first abutting portion 424 , and the second scissor arm 44 may include a second blade portion 442 and a second abutting portion 444 .

[0092] Please refer to Figure 2 When the thread trimming assembly 4 is in the active state, the first blade portion 422 and the second blade portion 442 are in a closed state to perform the thread trimming operation; the first abutment portion 424 and the second abutment portion 444 are combined with each other to form an abutment structure 40, which can be used to abut the suture 11 extending along the suture path (refer to Figure 2 and 3 ).

[0093] In this embodiment, the first abutting portion 424 and the second abutting portion 444 each include a notch respectively disposed at the end of the first scissor arm 42 and the second scissor arm 44 .

[0094] Optionally, the thread cutter 1 includes a guide structure 64, which is disposed on the first scissor arm 42 and / or the second scissor arm 44 and is adjacent to the positioning portion 205 and the abutment structure 40 on the extension arm 204, respectively. The guide structure 64 can guide the suture 11 located at the positioning portion 205 to the abutment structure 40 (refer to Figure 2 and Figure 3 ).

[0095] Optionally, the lead structure 64 includes a groove provided on the first scissor arm 42 and / or the second scissor arm 44 .

[0096] Preferably, the distance D between the two extension arms 204 (ie, the width of the U-shaped groove 202) may be smaller than the sum of the wall thickness F of the first scissor arm 42 and the second scissor arm 44 (refer to Figure 4 ), with this structural design, when the wire cutting assembly 4 is in the working state, the two extension arms 204 can respectively apply squeezing force to the first scissor arm 42 and the second scissor arm 44, so as to facilitate the first blade portion 422 and the second blade portion 442 in the closed state to smoothly perform the wire cutting operation.

[0097] Please refer to Figure 1 When the thread cutting assembly 4 is in an inactive state, the first blade portion 422 and the second blade portion 442 are in an open state, and the first abutting portion 424 and the second abutting portion 444 are separated from each other to dissociate the abutting structure 40, so that the suture 11 abutting against the abutting structure 40 enters between the first blade portion 422 and the second blade portion 442.

[0098] Optionally, the thread trimmer assembly 4 includes a limiting portion 46 disposed on the first scissor arm 42 and / or the second scissor arm 44 , for defining a maximum pivoting angle of the first scissor arm 42 relative to the second scissor arm 44 .

[0099] In this embodiment, the limiting portion 46 may be disposed only on the second scissor arm 44 (see Figure 4 ).

[0100] The steps of performing a thread trimming operation using the thread trimmer 1 of the present application are mainly as follows:

[0101] Step 1: The locking structure 5 is in a locked state to maintain the thread cutting assembly 4 in an active state to form an abutment structure 40, and the abutment structure 40 abuts against the suture 11 (i.e., the suture 11) positioned on the assembly structure 20. Figure 2 and Figure 3 status shown).

[0102] Step 2, after the thread cutter 1 is delivered to the target position in the patient's body, the locking structure 5 is switched from the locked state to the unlocked state, and the core tube 3 is controlled to move axially toward the distal end of the outer tube 2, so that the thread cutting assembly 4 is switched from the active state to the inactive state. In this state, by pulling the suture, the suture 11 abutting against the abutting structure 40 can enter between the first blade portion 422 and the second blade portion 442 of the thread cutting assembly 4 (i.e., Figure 1 status shown).

[0103] Step 3, controlling the core tube 3 to move axially toward the proximal end of the outer tube 2, so that the thread cutting assembly 4 switches from the inactive state to the active state again to cut the suture 11 between the first blade portion 422 and the second blade portion 442.

[0104] To summarize, the wire cutter provided in the present application uses a four-bar mechanism to drive a double-piece scissor-type structural design (i.e., a linkage assembly consisting of two linkage parts and a wire cutting assembly consisting of two scissor arms), which can provide better cutting force and also has a good cutting effect on sutures made of harder materials.

[0105] In addition, the wire cutter provided in the present application has the advantages of simple operation and small structural size, and is particularly suitable for wire cutting operations in interventional surgeries.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application 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 embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A thread cutter, characterized in that: include: an outer tube, which is used to position the suture; a core tube movably inserted into the outer tube; and a wire cutting assembly connecting the outer tube and the core tube; Wherein, the core tube can reciprocate along the axial direction of the outer tube and drive the thread cutting assembly to switch between an inactive state and an active state to cut the suture; The outer tube also includes: tube body; An assembly structure extending along the axial direction of the tube body and used for pivotally connecting the thread cutting assembly and positioning the suture, the assembly structure comprising: Two extension arms, which are disposed on opposite sides of the tube body and extend along the axial direction of the tube body to define a U-shaped groove communicating with the tube body; A positioning portion, which is disposed on the two extension arms and is used to define a suture path, so that the suture disposed on the positioning portion extends along the suture path in the U-shaped groove; A pivoting member, used for pivotally connecting the thread cutting assembly to the two extension arms, so that the thread cutting assembly is suspended in the U-shaped groove, and the axial direction of the thread cutting assembly intersects with the suture path; The wire cutter further comprises a linkage assembly, and the wire cutting assembly further comprises: a first scissor arm and a second scissor arm; wherein the first scissor arm and the second scissor arm are pivotally connected via the pivot member; and wherein the first scissor arm and the second scissor arm are movably connected to the core tube via the linkage assembly, and when the core tube moves axially toward the proximal end of the outer tube, the first scissor arm can be driven to pivot relative to the second scissor arm, so that the wire cutting assembly is switched from the non-active state to the active state; When the core tube moves axially toward the distal end of the outer tube, the first scissor arm can be driven to pivot in the opposite direction relative to the second scissor arm, so that the wire cutting assembly is switched from the active state to the inactive state.

2. The thread cutter according to claim 1, characterized in that: The wire cutter further comprises a locking structure, which can be switched between a locking state and an unlocking state, wherein when the locking structure is in the locking state, it can respectively abut the outer tube and the core tube to limit the movement of the core tube relative to the outer tube, thereby maintaining the wire cutting assembly in the active state or the inactive state.

3. The thread cutter according to claim 1, characterized in that: The first scissor arm comprises: a first blade portion and a first abutting portion; The second scissor arm comprises: a second blade portion and a second abutment portion; Wherein, when the thread trimming assembly is in the active state, the first blade portion and the second blade portion are in a closed state to perform a thread trimming operation; the first abutting portion and the second abutting portion are combined with each other to form an abutting structure, and the abutting structure can abut the suture extending along the suture path; When the thread cutting assembly is in the inactive state, the first blade portion and the second blade portion are in an open state, the first abutting portion and the second abutting portion are separated from each other to dissociate the abutting structure, so that the suture abutting against the abutting structure enters between the first blade portion and the second blade portion.

4. The thread cutter according to claim 3, characterized in that: The first abutting portion and the second abutting portion each include a notch respectively provided at the end of the first scissor arm and the end of the second scissor arm.

5. The thread cutter according to claim 3, characterized in that: The thread trimmer assembly further includes a limiting portion disposed on the first scissor arm and / or the second scissor arm, for defining a maximum pivoting angle of the first scissor arm relative to the second scissor arm.

6. The thread cutter according to claim 3, characterized in that: The wire cutter also includes: A lead structure is arranged on the first scissor arm and / or the second scissor arm and is adjacent to the positioning portion and the abutment structure on the extension arm respectively. The lead structure is used to guide the suture located at the positioning portion to the abutment structure.

7. The thread cutter according to claim 6, characterized in that: The lead structure includes a groove arranged on the first scissor arm and / or the second scissor arm.

8. The thread cutter according to claim 1, characterized in that: The distance between the two extension arms is smaller than the sum of the wall thicknesses of the first scissor arm and the second scissor arm.

9. The thread cutter according to claim 1, characterized in that: The first scissor arm and the second scissor arm are made of high carbon steel and high speed tool steel.

10. The thread cutter according to claim 1, characterized in that: The linkage assembly comprises a first linkage member and a second linkage member, wherein the first linkage member is pivotally connected to the second linkage member and the second scissor arm; and the second linkage member is pivotally connected to the first scissor arm and the core tube.

11. The thread trimmer according to claim 1, characterized in that: The outer tube and the core tube also have bending parts respectively, so that the outer tube and the core tube can be bent when subjected to external force.

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