Tissue cutting instrument

Abstract

The present invention relates to a tissue cutting instrument, which includes a cutting assembly and a control device. The cutting assembly includes a cutting part and a stretching part connected to the cutting part. The control device includes a housing and an operating assembly at least partially disposed in the housing. The operating assembly includes a guide rail, a blocking member, and a slider that can axially slide relative to the guide rail. The guide rail is received in the housing, and the blocking member is disposed outside the guide rail or received inside the guide rail. The stretching part is connected to the slider, and the axial sliding of the slider along the guide rail drives the axial sliding of the stretching part, thereby tightening the stretching part and deforming the cutting part. The blocking member forms a blocking effect on the axial sliding of the slider. The slider includes a sliding member and a mounting seat connected to the sliding member. The sliding member is sleeved on the guide rail, and the stretching part is fixedly connected to the mounting seat. This tissue cutting instrument is beneficial to avoid deformation or misalignment of the cutting assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a tissue cutting instrument. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Normal contraction and relaxation of the heart are the guarantee for the normal activities of organisms. When abnormalities occur in the structure or function of the heart, resulting in impaired ventricular filling or ejection function, a complex clinical syndrome will occur, called heart failure, with the main clinical manifestations of dyspnea and fatigue (limited activity tolerance), as well as fluid retention (pulmonary congestion and peripheral edema). Heart failure is a serious and terminal stage of various heart diseases, with a very high incidence rate, and has become the most important cardiovascular disease in the world. Heart failure can be divided into diastolic heart failure and systolic heart failure. Diastolic heart failure refers to the condition in which the ventricular relaxation and compliance are reduced under normal ventricular systolic function, resulting in reduced ventricular filling volume and increased filling pressure, thereby producing pulmonary circulation and systemic circulation congestion syndrome. Diastolic heart failure can cause increased pressure in the left atrium and pulmonary veins, hindering the normal flow of oxygenated blood. At present, the treatment of diastolic heart failure is mainly based on drug therapy. Clinical data show that using interventional devices to open a small hole in the atrial septum of patients with diastolic heart failure to form a left-to-right shunt can help reduce the pressure in the left atrium of patients with diastolic heart failure and improve the symptoms of heart failure patients.

[0004] At present, there are two main ways to form a small hole in the atrial septum by using interventional devices: one is to first puncture the atrial septum tissue, then use a balloon to expand the puncture site to a larger size to form an opening of a certain size, and then withdraw the balloon to form an interatrial shunt. In this way, tissue rebound often occurs after the balloon is withdrawn, causing the opening to shrink or even close. Another treatment method is to first puncture the atrial septum tissue, and then implant a stent at the puncture site. There is an opening of a set size in the middle of the stent. The stent props up the puncture site to form an opening on the atrial septum, and the stent is used to maintain the existence of the opening. In this method, the stent is an implant, which will undergo endothelialization, and the opening of the atrial septum is easily covered and blocked by the endothelial membrane. Therefore, both of the above two treatment methods have the risk of opening closure, resulting in poor patient prognosis.

[0005] Currently, some researchers are using cutting to directly form holes in the atrial septum to treat diastolic heart failure. Some cutting devices use coils as cutting components and cut by tightening the coils. However, since the wire diameter of the coils is generally small and the coils are relatively soft, they are easily deformed or dislocated when improperly pulled, resulting in unsuccessful operations and even device scrapping. Summary of the Invention

[0006] Based on this, it is necessary to provide a tissue cutting instrument that is beneficial to avoid deformation or misalignment of the cutting component.

[0007] A tissue cutting instrument includes a cutting component and a control device. The cutting component includes a cutting part and a stretching part connected to the cutting part. The control device includes a housing and an operating component at least partially disposed in the housing. The operating component includes a guide rail, a blocking member, and a slider that can axially slide relative to the guide rail. The guide rail is received in the housing. The blocking member is disposed outside the guide rail or received inside the guide rail. The stretching part is connected to the slider. The slider slides axially along the guide rail to drive the stretching part to slide axially, thereby tightening the stretching part to deform the cutting part. The blocking member forms a blocking effect on the axial sliding of the slider.

[0008] The slider includes a sliding member and a mounting seat connected to the sliding member. The sliding member is sleeved on the guide rail. The stretching part is fixedly connected to the mounting seat.

[0009] In one embodiment, the blocking member is an elastic member. The blocking member is sleeved on the guide rail or the blocking member is disposed inside the guide rail.

[0010] In one embodiment, the guide rail includes a first guiding part and a second guiding part. The first guiding part and the second guiding part are spaced apart to form a gap. The blocking member is sleeved on the first guiding part and the second guiding part or the blocking member is disposed in the gap between the first guiding part and the second guiding part.

[0011] In one embodiment, the guide rail further includes a first fixing part and a second fixing part. Two receiving cavities are formed on the second fixing part. One end of the first guiding part is fixedly connected to the first fixing part, and the other end is received in one of the receiving cavities and is movably connected to the second fixing part. One end of the second guiding part is fixedly connected to the first fixing part, and the other end is received in the other receiving cavity and is movably connected to the second fixing part.

[0012] In one embodiment, the second fixing part includes a second body. The second body includes a base, a side edge, and a partition member. The side edge surrounds the side edge of the base. The partition member is disposed on the base. The base, the side edge, and the partition member form the two receiving cavities.

[0013] In one embodiment, the first guiding portion includes a first guiding member and two first abutting members disposed on the first guiding member, the second guiding portion includes a second guiding member and two second abutting members disposed on the second guiding member, and the two first abutting members and the two second abutting members are both abutted against the partition member.

[0014] In one embodiment, the housing includes a first outer shell and a second outer shell that are detachably connected. When the first outer shell and the second outer shell are connected, a first receiving groove and a second receiving groove are formed. The first fixing portion includes a first engaging member, the second fixing portion includes a second engaging member, the first engaging member is received in the first receiving groove, and the second engaging member is received in the second receiving groove so that the guide rail is detachably fixed in the housing.

[0015] In one embodiment, the mounting seat divides the sliding member into two channels, and the first guiding portion and the second guiding portion respectively pass through the two channels so that the sliding member is sleeved on the guide rail.

[0016] In one embodiment, the slider further includes an operating portion, and the operating portion includes a connecting member and an operating member. One end of the connecting member is fixedly connected to the outer wall of the sliding member, and the other end extends out of the housing and is located outside the housing and is connected to the operating member.

[0017] In one embodiment, the slider further includes a fastener. A receiving groove is formed on the mounting seat, the fastener is received in the receiving groove, and the stretching portion passes through the mounting seat and the fastener and is locked.

[0018] In one embodiment, the fastener includes a first fastening portion and a second fastening portion. The second fastening portion is received in the first fastening portion, and the stretching portion passes through the first fastening portion and the second fastening portion and is clamped by the first fastening portion and the second fastening portion.

[0019] In one embodiment, the cutting assembly further includes a first connecting portion and a second connecting portion. The cutting portion, the stretching portion, and the first connecting portion are integrally formed. The first connecting portion includes two silk threads, and the two silk threads are connected to form a closed end. The second connecting portion is lapped on the closed end of the first connecting portion.

[0020] The cutting part of the above tissue cutting instrument includes a cutting part and a stretching part. The axial sliding of the slider on the guide rail drives the axial sliding of the stretching part, thereby tightening the cutting part to deform the cutting part to achieve cutting. The blocking part on the guide rail forms a blocking effect on the axial sliding of the slider. It is necessary to overcome the blocking effect of the blocking part to make the slider slide axially along the guide rail and make the stretching part act. Therefore, it is beneficial to avoid inappropriate pulling, and thus beneficial to avoid deformation or dislocation of the cutting part. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Wherein:

[0023] Figure 1 is a schematic external view of a tissue cutting instrument according to an embodiment;

[0024] Figure 2 is a schematic connection state diagram of a delivery catheter and a cutting assembly of a tissue cutting instrument according to an embodiment;

[0025] Figure 3 is a schematic structural diagram of a cutting assembly according to an embodiment;

[0026] Figure 4 is a schematic structural diagram of a cutting assembly according to another embodiment;

[0027] Figure 5 is Figure 4 a partial enlarged view of;

[0028] Figure 6 is a schematic structural diagram of a cutting assembly according to another embodiment;

[0029] Figure 7 is a schematic connection relationship diagram of a cutting assembly and a delivery catheter according to an embodiment;

[0030] Figure 8 is an exploded view of a control device according to an embodiment;

[0031] Figure 9 is a schematic structural diagram of a first housing according to an embodiment;

[0032] Figure 10 is a schematic structural diagram of a second housing according to an embodiment;

[0033] Figure 11 is a schematic structural diagram of a guide rail according to an embodiment with the second fixed seat omitted;

[0034] Figure 12 is Figure 11 a schematic structural view of the guide rail shown from another angle;

[0035] Figure 13 a schematic structural view of an embodiment of a tissue cutting instrument with the second housing omitted;

[0036] Figure 14 a schematic structural view of the second fixing part of the guide rail according to an embodiment;

[0037] Figure 15 a schematic structural view of a slider according to an embodiment;

[0038] Figure 16 a schematic structural view of the fastener of the slider according to an embodiment;

[0039] Figure 17 a schematic view of the installation state of the guide rail and the blocking member according to an embodiment. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the embodiments of the present invention, it should be noted that, as terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the embodiments of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0043] In the field of interventional medical devices, generally, the end of a medical device implanted or inserted into the human or animal body that is closer to the operator is called the "proximal end", and the end that is farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined based on this principle. The "axial direction" generally refers to the length direction of the medical device when it is being delivered, and the "radial direction" generally refers to the direction perpendicular to the "axial direction" of the medical device, and the "axial direction" and "radial direction" of any component of the medical device are defined based on this principle.

[0044] Please refer to Figure 1 , a tissue cutting device 1 of an embodiment includes a cutting assembly 10 and a control device 20. The control device 20 is used to control the cutting assembly 10 to cut tissue so as to form a small hole at the target position.

[0045] Please also refer to Figure 2 , the tissue cutting device 1 further includes a delivery catheter 30, and the proximal end of the delivery catheter 30 is fixedly connected to the control device 20. The cutting assembly 10 is connected to the delivery catheter 30.

[0046] Please refer to Figure 3 , the cutting assembly 10 includes a cutting part 110 and a stretching part 120 connected to the cutting part 110. The cutting part 110 includes two connected cutting wires 111. In one embodiment, each cutting wire 111 is C-shaped and has an open end. The two cutting wires 111 are connected at the open end to form a closed coil, and the closed coil has two opposite connection ends, and the two connection ends are concave to form two concave parts 112, so that the outer contour of the closed coil is similar to the outer contour of the number 8.

[0047] The stretching part 120 is linear, one end of the stretching part 120 is connected to one concave part 112 of the cutting part 110, and the other end extends axially in the inner cavity of the delivery catheter 30.

[0048] The cutting part 110 and the stretching part 120 can be connected by methods mastered by those skilled in the art. Alternatively, the cutting part 110 and the stretching part 120 are integrally formed. For example, a metal wire or other wire capable of conducting electricity is bent into two sections and shaped to form the cutting part 110, and the metal wire or other wire extends linearly from one of the concave parts 112 of the cutting part 110 and is shaped so that the two linear metal wires or other wires form a stretching part 120 that is not in the same plane as the cutting part 110. Since the wire diameter of the metal wire or other wire is generally small, this integrally formed method is beneficial to avoid breaking the metal wire or other wire during connection and fixation, and improve reliability.

[0049] In one embodiment, the cutting assembly 10 further includes a connecting portion 130. The connecting portion 130 is linear. One end of the connecting portion 130 is connected to another concave portion 112 of the cutting portion 110, and the other end extends axially in the inner cavity of the conveying catheter 30. The connecting portion 130 and the cutting portion 110 are not in the same plane. In one embodiment, when both the connecting portion 130 and the stretching portion 120 extend in the conveying catheter 30, the connecting portion 130 and the stretching portion 120 are parallel or substantially parallel.

[0050] In one embodiment, the connecting portion 130 and the cutting portion 110 are of a non-integral structure, and the connecting portion 130 and the cutting portion 110 are fixedly connected or movably connected. Among them, the fixed connection can be to fix the connecting portion 130 to the concave portion 112 of the cutting portion 110 by means such as welding and bonding. The movable connection can be a lap joint. For example, a silk thread is bent after passing over the concave portion 112 of the cutting portion 110 so that the connecting portion 130 is lapped on the cutting portion 110. In such an embodiment, the material of the connecting portion 130 is not limited to a conductive material, and can also be other non-conductive materials.

[0051] In one embodiment, the cutting portion 110, the stretching portion 120, and the connecting portion 130 are of an integral structure, formed by bending and shaping a single silk thread.

[0052] In one embodiment, as Figure 4 shown, the cutting assembly 10 includes a cutting portion 110, a stretching portion 120, a first connecting portion 140, and a second connecting portion 150. The cutting portion 110, the stretching portion 120, and the first connecting portion 140 are integrally formed after being bent and shaped by a conductive silk thread.

[0053] Please refer to Figure 5 together. In one embodiment, the cutting portion 110, the stretching portion 120, and the first connecting portion 140 are bent by a single conductive silk thread. After bending, a first section of silk thread 101 and a second section of silk thread 102 are formed. The connecting ends of the first section of silk thread 101 and the second section of silk thread 102 are the closed ends formed after the silk thread is bent. Both the first section of silk thread 101 and the second section of silk thread 102 have free ends. The bent silk thread extends linearly from the closed end for a certain distance to form the first connecting portion 140, and then the first section of silk thread 101 and the second section of silk thread 102 are respectively bent and shaped to form two cutting lines 111 of the cutting portion 110. Then, the first section of silk thread 101 and the second section of silk thread 102 extend linearly and are shaped to form the stretching portion 120 that is not in the same plane as the cutting portion 110. The first connecting portion 140 includes two sections of silk thread, and the ends of the two sections of silk thread away from the cutting portion 110 are closed ends. The stretching portion 120 includes two sections of silk thread, and the ends of the two sections of silk thread away from the cutting portion 110 are open sections.

[0054] The second connecting portion 150 is also composed of silk threads, and the silk threads cross the closed end of the first connecting portion 140 and overlap on the first connecting portion 140. After the silk threads cross the first connecting portion 140, a first section 151 and a second section 152 are formed. The first section 151 and the second section 152 constitute the second connecting portion 150, and the first section 151 and the second section 152 are parallel. Moreover, the first section 151 and the second section 152 respectively have free ends.

[0055] The second connecting portion 150 can be made of a conductive material or a non-conductive material.

[0056] In one embodiment, as Figure 6 shown, the cutting assembly 10 does not include the connecting portion 130, and the cutting assembly 10 includes two stretching portions 120. The two stretching portions 120 are respectively connected to the two concave portions 112, and each stretching portion 120 extends in the inner cavity of the delivery catheter 30. The cutting portion 110 and the two stretching portions 120 are integrally formed or the two stretching portions 120 are respectively fixedly connected to the cutting portion 110.

[0057] Please refer to Figure 7 , in one embodiment, two channels 310 are formed in the catheter wall of the delivery catheter 30. The two channels 310 extend along the axial direction of the delivery catheter 30, and the two channels 310 are symmetrically arranged with respect to the axial central axis of the delivery catheter 30.

[0058] In an embodiment where the cutting assembly 10 includes only the cutting portion 110 and one stretching portion 120, the stretching portion 120 extends into one of the channels 310. In this case, the channel 310 of the delivery catheter 30 can also be only one.

[0059] In an embodiment where the cutting assembly 10 includes the cutting portion 110, the stretching portion 120 and the connecting portion 130, the connecting portion 130 extends into one of the channels 310, the stretching portion 130 extends into the other channel 310, and the cutting portion 110 is located outside the delivery catheter 30.

[0060] In an embodiment where the cutting assembly 10 includes the cutting portion 110, the stretching portion 120, the first connecting portion 140 and the second connecting portion 150, the stretching portion 120 extends into one of the channels 310, the first connecting portion 140 and the second connecting portion 150 extend into the other channel 310, and the cutting portion 110 is located outside the delivery catheter 30.

[0061] In an embodiment where the cutting assembly 10 includes the cutting portion 110 and two stretching portions 120, the two stretching portions 120 respectively extend into the two channels 310, and the cutting portion 110 is located outside the delivery catheter 30.

[0062] In one embodiment, in the natural state (the natural state refers to the state after the tissue cutting instrument 1 is assembled and before it is used, or the state without being subjected to external forces. The natural state hereinafter has the same meaning and will not be elaborated further), the stretching portion 120 is substantially perpendicular to the cutting portion 110, and the connecting portion 130 or the first connecting portion 140 is substantially perpendicular to the cutting portion 110. Moreover, the area enclosed by each cutting line 111 is greater than half of the cross-sectional area of the delivery catheter 30. The cutting portion 110 forms two concave portions 112 such that when the stretching portion 120 and the connecting portion 130 extend into the delivery catheter 30, or the stretching portion 120, the first connecting portion 140 and the second connecting portion 150 extend into the delivery catheter 30, or when the two stretching portions 120 extend into the delivery catheter 30, the two concave portions 112 of the cutting portion 110 overlap the distal end face of the delivery catheter 30, while the remaining portion of the cutting portion 110 is located outside the delivery catheter 30. In a plane perpendicular to the axial center axis of the delivery catheter 30, the projection of the remaining portion of the cutting portion 110 except for the concave portions 112 surrounds the projection of the delivery catheter 30.

[0063] Regardless of whether the cutting assembly 10 includes the connecting portion 130, or whether it includes the first connecting portion 140 and the second connecting portion 140, after the tissue cutting instrument 1 is delivered to the target position in the organism, the cutting portion 110 is located outside the delivery catheter 30, so as to facilitate the cutting portion 110 to surround the tissue to be cut, so as to achieve smooth cutting, which is conducive to ensuring that the aperture size of the small hole formed after cutting meets the requirements. The shape of the cutting portion 110 of the cutting assembly 10 described above, the connection relationship between the cutting portion 110 and the stretching portion 120 and the connecting portion 130 (or the first connecting portion 140 and the second connecting portion 150), and the connection relationship between the stretching portion 120 and the connecting portion 130 (or the first connecting portion 140 and the second connecting portion 150) and the delivery catheter 30; or, the shape of the cutting portion 110 of the cutting assembly 10 described above, the connection relationship between the cutting portion 110 and the two stretching portions 120, and the connection relationship between the two stretching portions 120 and the delivery catheter 30 are conducive to ensuring that after the tissue cutting instrument 1 is delivered to the target position in the organism, the cutting portion 110 is located outside the delivery catheter 30, which is conducive to preventing the cutting portion 110 from being misaligned and unable to surround the tissue to be cut, so as to ensure the smooth progress of the operation.

[0064] The cutting assembly 10 is made of a conductive filamentous material. For example, it is made of a metal wire. The metal wire includes but is not limited to nitinol wire, stainless steel wire, etc. The cutting assembly 10 can also be made of a combination of a conductive filamentous material and a non-conductive filamentous material.

[0065] During use, the stretching part 120 of the cutting component 10 is connected to an external power source for electric cutting. The stretching part 120 not only controls the deformation of the cutting part 110, but also plays a role in electrical connection to make the cutting part 110 charged during cutting, which is beneficial to making the structure of the tissue cutting instrument 1 relatively compact. It should be noted that in other embodiments, the channel 310 can be omitted, and the stretching part 120 extends axially in the inner cavity of the delivery catheter 30, and the connecting part 130 extends axially in the inner cavity of the delivery catheter 30. However, by providing two channels 310 to respectively accommodate the stretching part 120 and the connecting part 130 (or the first connecting part 140 and the second connecting part 150), on the one hand, the channels 310 can stabilize the stretching part 120 and the connecting part 130 (or the first connecting part 140 and the second connecting part 150), which is beneficial to keeping the cutting part 110 outside the delivery catheter 30 and avoiding deformation of the cutting part 110. On the other hand, the stretching part 120 extends in the channel 310, that is, the charged stretching part 120 is isolated in the channel 310, avoiding interference with other components in the cavity of the delivery catheter 30.

[0066] Please refer to Figure 1 and Figure 8 , in one embodiment, the control device 20 includes a housing 210 and an operating component at least partially disposed in the housing 210.

[0067] Please refer to Figure 8 , Figure 9 and Figure 10 , the housing 210 includes a first outer shell 211 and a second outer shell 212. The first outer shell 211 and the second outer shell 212 are detachably connected, and when the first outer shell 211 and the second outer shell 212 are connected, they enclose a receiving cavity, and the operating component is at least partially received in the receiving cavity.

[0068] The housing 210 further includes a first locking member 213, and the first locking member 213 is detachably connected to the first outer shell 211 and the second outer shell 212 to achieve the detachable connection between the first outer shell 211 and the second outer shell 212.

[0069] In one embodiment, one end of the first outer shell 211 is provided with a first fixing block 2111, the surface of the first fixing block 2111 is provided with an external thread, one end of the second outer shell 212 is provided with a second fixing block 2121, the surface of the second fixing block 2121 is provided with an external thread, the inner surface of the first locking member 213 is provided with an internal thread, and the first locking member 213 is sleeved on the first fixing block 2111 and the second fixing block 2121, and the detachable connection is achieved through thread cooperation.

[0070] In another embodiment, the housing 210 further includes a second locking member ( Figure 8(not shown), the second locking member and the first locking member 213 are disposed opposite to each other in the axial direction. Correspondingly, another first fixing block 2111 is provided at the other end of the first housing 211, and another second fixing block 2121 is provided at the other end of the second housing 212. The second locking member is sleeved on the first fixing block 2111 and the second fixing block 2121.

[0071] In one embodiment, as Figure 9 shown, the first housing 211 is provided with a slot 2115 and a engaging member 2116. As Figure 10 shown, the second housing 212 is provided with an engaging member 2117 and a slot 2118. The engaging member 2117 is inserted into the slot 2115, and the engaging member 2116 is inserted into the slot 2118. Then, the first housing 211 and the second housing 212 are locked by the first locking member 213 to achieve the detachable connection of the first housing 211 and the second housing 212. The provision of the slot 2115, the slot 2118, the engaging member 2116 and the engaging member 2117 is conducive to the alignment of the first housing 211 and the second housing 212 for convenient installation. At the same time, the slot 2115, the slot 2118, the engaging member 2116 and the engaging member 2117 cooperate with the first locking member 213, which is conducive to the reliable connection of the first housing 211 and the second housing 212.

[0072] It can be understood that in other embodiments, the slot 2115 and the slot 2118 can both be opened on the first housing 211 or both be opened on the second housing 212, and the engaging member 2116 and the engaging member 2117 can both be provided on the second housing 212 or both be provided on the first housing 211. In another embodiment, the housing 210 can also be provided with only one slot and one engaging member, that is, one of the first housing 211 and the second housing 212 is provided with a slot, and the other of the first housing 211 and the second housing 212 is provided with an engaging member.

[0073] In one embodiment, a strip-shaped notch 2112 is formed at the edge of the first housing 211, and a strip-shaped notch 2122 is formed on the second housing 212. When the first housing 211 and the second housing 212 are connected, the strip-shaped notch 2112 of the first housing 211 and the strip-shaped notch 2122 of the second housing 212 are aligned to form an operation window. In one embodiment, there are two operation windows, and the two operation windows are located on both sides of the housing 210 and are symmetrically arranged with respect to the axial center axis of the housing 210.

[0074] Two first fixing grooves 2113 and two second fixing grooves 2114 are provided on the first housing 211, and two third fixing grooves 2123 and two fourth fixing grooves 2124 are provided on the second housing 212. When the first housing 211 and the second housing 212 are connected, the two first fixing grooves 2113 and the two third fixing groove groups 2123 are respectively aligned to form two first receiving grooves. The two first receiving grooves are symmetrically arranged with respect to the axial center axis of the housing 210. The two second fixing grooves 2114 and the two fourth fixing grooves 2124 are respectively aligned to form two second receiving grooves. The two second receiving grooves are symmetrically arranged with respect to the axial center axis of the housing 210. The first receiving grooves and the second receiving grooves are arranged at intervals in the axial direction.

[0075] Please return to Figure 8 , the operation assembly includes a guide rail 220, a slider 230 and a blocking member 240.

[0076] Please refer to Figure 11 and Figure 12 , in an embodiment, the guide rail 220 includes a first guiding portion 221 and a second guiding portion 222. The first guiding portion 221 and the second guiding portion 222 are arranged at intervals, and a gap 223 is formed therebetween.

[0077] The first guiding portion 221 and the second guiding portion 222 have the same shape. Both the first guiding portion 221 and the second guiding portion 222 are arc-shaped shells having a concave surface and a convex surface, and the concave surfaces of the first guiding portion 221 and the second guiding portion 222 are both located inside, and the concave surfaces of the first guiding portion 221 and the second guiding portion 222 face each other.

[0078] In an embodiment, the first guiding portion 221 and the second guiding portion 222 are two arc-shaped shells formed by respectively cutting off two opposite arc-shaped shells from a hollow cylinder along the length direction (axial direction).

[0079] In an embodiment, as Figure 12 shown, the first guiding portion 221 includes a first guiding member 2211 and two first abutting members 2212 provided on the first guiding member 2211. The first guiding member 2211 is an arc-shaped shell having a concave surface and a convex surface, and the concave surface is located inside. The first abutting members 2212 are strip-shaped protrusions extending along the axial length of the first guiding member 2211, and the two first abutting members 2212 are arranged at intervals and are respectively located on both sides of the concave surface of the first guiding member 2211.

[0080] The second guiding part 222 includes a second guiding member 2221 and two second abutting members 2222 arranged on the second guiding member 2221. The second guiding member 2221 is an arc-shaped housing having a concave surface and a convex surface, and the concave surface is located on the inner side. The second abutting member 2222 is a strip-shaped protrusion extending along the axial length of the second guiding member 2221. The two second abutting members 2222 are arranged at intervals and are respectively located on both sides of the concave surface of the second guiding member 2221.

[0081] Please refer to Figure 13 , in one embodiment, the slider 230 is sleeved on the first guiding part 221 and the second guiding part 222, and can axially slide along the first guiding part 221 and the second guiding part 222.

[0082] Please also refer to Figure 11 , Figure 12 and Figure 13 , in one embodiment, both the first guiding part 221 and the second guiding part 222 have arc-shaped surfaces. When the slider 230 is sleeved on the first guiding part 221 and the second guiding part 222, the inner surface of the slider 230 cooperates with the arc-shaped surfaces of the first guiding part 221 and the second guiding part 222, so that the slider 230 can slide smoothly along the guide rail 220.

[0083] In one embodiment, the guide rail 220 further includes a first fixing part 224 and a second fixing part 225. The first fixing part 224 is located at the proximal end, and the second fixing part 225 is located at the distal end. The two ends of the first guiding part 221 are respectively connected to the first fixing part 224 and the second fixing part 225, and the two ends of the second guiding part 222 are respectively connected to the first fixing part 224 and the second fixing part 225. The first fixing part 224 and the second fixing part 225 are received in the accommodation cavity formed by the first housing 211 and the second housing 212.

[0084] In one embodiment, one end of the first guiding part 221 and one end of the second guiding part 222 are both fixedly connected to the first fixing part 224, and the other end of the first guiding part 221 and the other end of the second guiding part 222 are both detachably connected to the second fixing part 225.

[0085] Please go back to Figure 12 , in one embodiment, the first fixing part 224 includes a first body 2241 and two first engaging members 2242 respectively located on both sides of the first body 2241 and connected to the first body 2241. One end of the first guiding part 221 and one end of the second guiding part 222 are both fixedly connected to the first body 2241. The two first engaging members 2242 are respectively engaged in two first receiving grooves of the housing 210. When the first locking member 213 locks the first housing 211 and the second housing 212, the first fixing part 224 is engaged in the two first receiving grooves.

[0086] In one embodiment, the first body 2241 is generally cylindrical with an opening in the middle. One end of the first guiding portion 221 and one end of the second guiding portion 222 are both connected to the bottom surface of the first body 2241.

[0087] It can be understood that the first body 2241 and the two first engaging members 2242 can be integrally formed, or the two first engaging members 2242 can be connected or fixed to both sides of the first body 2241 by connection or fixing methods mastered by those skilled in the art.

[0088] Please refer to Figure 14 , the second fixing portion 225 includes a second body 2251 and two second engaging members 2252 located on both sides of the second body 2251 and connected to the second body 2251. The two second engaging members 2252 are respectively engaged in the two second receiving grooves of the housing 210. When the first locking member 213 locks the first housing 211 and the second housing 212, the second fixing portion 225 is engaged in the two second receiving grooves.

[0089] The second body 2251 includes an annular base 22511, side edges 22512, and partition members 22513. The side edges 22512 surround the outer edge of the base 22511 to form a groove structure with an open bottom surface. The number of partition members 22513 is four, and they are arranged in parallel in pairs on the base 22511. The base 22511, side edges 22512, and partition members 22513 form two receiving cavities 22514. The shape of the receiving cavities 22514 matches the shape of the ends of the first guiding portion 221 and the second guiding portion 222. The other end of the first guiding portion 221 is received in one of the receiving cavities 22514, and the other end of the second guiding portion 222 is received in the other receiving cavity 22514. The first guiding portion 221 is located between the side edges 22512 and the partition members 22513, and the second guiding portion 222 is located between the side edges 22512 and the partition members 22513. The side edges 22512 and the partition members 22513 limit the radial displacement of the first guiding portion 221 and the second guiding portion 222.

[0090] In one embodiment, when the first guiding portion 221 includes a first abutting member 2212 and the second guiding portion 222 includes a second abutting member 2222, the first abutting member 2212 and the second abutting member 2222 respectively abut against the adjacent partition members 22513. Moreover, through the cooperation of the first guiding member 2211 and the two first abutting members 2212, a receiving cavity is formed in the concave surface of the first guiding portion 221. Similarly, a receiving cavity is formed in the second guiding portion 222 to accommodate other components, making the structure relatively compact.

[0091] When the first locking member 213 is used to lock the first housing 211 and the second housing 212, the guide rail 220 can be fixed in the inner cavity of the housing 210. The first guiding portion 221 and the second guiding portion 222 are in shape-matching with the accommodating cavity 22514, so that the ends of the first guiding portion 221 and the second guiding portion 222 are detachably embedded in the second fixing seat 225, and fixation is achieved in a manner convenient for installation and disassembly.

[0092] By making the first receiving groove and the second receiving groove on the housing 210 structurally match with the first fixing portion 224 and the second fixing portion 225 of the guide rail 220 respectively, and the first guiding portion 221 and the second guiding portion 222 of the guide rail 220 structurally match with the second fixing portion 225 respectively, when the first housing 211 and the second housing 212 are connected, the guide rail 220 can be reliably fixed in the housing 210 without using fasteners such as screws for fixation, which is convenient for installation and disassembly; nor is it necessary to use glue for bonding and fixation, which is beneficial to avoiding product failure caused by glue aging, and thus is beneficial to improving the shelf life.

[0093] Please return to Figure 13 , in an embodiment, the slider 230 is sleeved on the first guiding portion 221 and the second guiding portion 222 and can axially slide along the first guiding portion 221 and the second guiding portion 222.

[0094] The stretching portion 120 of the cutting assembly 10 is fixedly connected to the slider 230. The axial sliding of the slider 230 along the guide rail 220 drives the stretching portion 120 to axially slide, thereby tightening the cutting portion 110 and deforming the cutting portion 110. During the operation, the cutting portion 110 surrounds the tissue to be cut. By axially sliding the slider 230 to pull the stretching portion 120 to tighten the cutting portion 110, and under the action of an electric current, tissue cutting is achieved.

[0095] Please refer to Figure 15 , in an embodiment, the slider 230 includes a sliding member 231 and a mounting seat 232. The sliding member 231 is of an annular structure, and the mounting seat 232 is connected to the inner wall of the sliding member 231 and is disposed inside the sliding member 231. The mounting seat 232 divides the sliding member 231 into two channels 233. The first guiding portion 221 and the second guiding portion 222 respectively pass through the two channels 233, that is, the sliding member 231 is sleeved on the first guiding portion 221 and the second guiding portion 222. The inner wall of the sliding member 231 is adapted to the outer walls of the first guiding portion 221 and the second guiding portion 222.

[0096] The mounting base 232 includes a first mounting area 2321 and a second mounting area 2322. The first mounting area 2321 and the second mounting area 2322 are connected by a connecting area 2323. The first mounting area 2321 is connected to the inner wall of the sliding member 231, and the second mounting area 2322 is connected to the inner wall of the sliding member 231, so that the mounting base 232 is fixedly connected to the sliding member 231.

[0097] The first mounting area 2321 and / or the second mounting area 2322 are used to fix the stretching part 120 of the cutting assembly 10. When the cutting assembly 10 includes one stretching part 120, the stretching part 120 is fixed to the first mounting area 2321, passes through the first mounting area 2321 and extends proximally, and is connected to the power supply device. Alternatively, the stretching part 120 is fixed to the second mounting area 2322, passes through the second mounting area 2322 and extends proximally, and is connected to the power supply device. When the cutting assembly 10 includes two stretching parts 120, the two stretching parts 120 are respectively fixed in the first mounting area 2321 and the second mounting area 2322, and extend proximally respectively.

[0098] In an embodiment, a first receiving groove 23211 is formed in the first mounting area 2321, and a first through hole 23212 is formed in the bottom of the first receiving groove 23211. A second receiving groove 23221 is formed in the second mounting area 2322, and a second through hole 23222 is formed in the bottom of the second receiving groove 23221.

[0099] Please refer to Figure 16 , in an embodiment, the slider 230 further includes a fastener 234. The fastener 234 is used to fix the stretching part 120, so that the stretching part 120 is fixedly connected to the mounting base 232. The fastener 234 includes a first fastening part 2341 and a second fastening part 2342. A receiving groove is formed in the first fastening part 2341, and the second fastening part 2342 is received in the receiving groove of the first fastening part 2341. The first fastening part 2341 is received in the first receiving groove 23211 and / or the second receiving groove 23221 of the mounting base 232.

[0100] A first opening 23411 is formed in the first fastening part 2341, and a second opening 23421 is formed in the second fastening part 2342. The stretching part 120 passes through the first through hole 23212 of the first mounting area 2321 and / or through the second through hole 23222 of the second mounting area 2322, and passes through the first opening 23411 of the first fastening part 2341 and the second opening 23421 of the second fastening part 2342 and is then locked, and the stretching part 120 extends proximally.

[0101] In one embodiment, the receiving groove of the first fastening portion 2341 is matched with the shape and size of the second fastening portion 2342. After the stretching portion 120 extends into the first opening 23411 of the first fastening portion 2341 and the second opening 23421 of the second fastening portion 2342, the second fastening portion 2342 is inserted into the receiving groove of the first fastening portion 2341, and the second fastening portion 2342 is rotated. The second fastening portion 2342 is embedded in the first fastening portion 2341 so that the stretching portion 120 is clamped by the first fastening portion 2341 and the second fastening portion 2342, thereby realizing the fixed connection between the stretching portion 120 and the slider 230.

[0102] The stretching portion 120 is made of a metal wire with a smaller wire diameter. Fixing the stretching portion 120 by the cooperation of the first fastening portion 2341 and the second fastening portion 2342 is beneficial to avoid the risk of breaking the stretching portion 120 due to the fixed connection.

[0103] It should be noted that in other embodiments, the fastener 234 may also be omitted and other methods may be used to fix the stretching portion 120. For example, the stretching portion 120 is passed through the first through hole 23212 or the second through hole 23222 and then knotted to realize the fixed connection between the stretching portion 120 and the slider 230.

[0104] In one embodiment, the slider 230 further includes an operating portion. Please refer to Figure 13 and Figure 15 , the operating portion includes a connecting member 235 and an operating member 236. One end of the connecting member 235 is fixedly connected to the outer wall of the sliding member 231, and the other end extends out from the operating window of the housing 210. The end extending out from the housing 210 is connected to the operating member 236. The operating member 236 is located outside the housing 210. When it is necessary to make the slider 230 slide axially along the guide rail 220, the slider 230 is made to slide axially along the guide rail 220 by manipulating the operating member 236.

[0105] The operating member 236 is detachably connected to the connecting member 235 for convenient assembly.

[0106] The operating portion may be one or two. When the operating portion is one, one operating window is provided on the housing 210. When the operating portion is two, two operating windows are provided on the housing 210.

[0107] In one embodiment, the blocking member 240 is an elastic member. In one embodiment, the blocking member 240 is a spring. In one embodiment, as Figure 13As shown, the blocking member 240 is sleeved on the first guiding portion 221 and the second guiding portion 222, and the blocking member 240 is located at the proximal end of the slider 230. Moreover, the proximal end of the blocking member 240 abuts against the first fixing portion 224 of the guide rail 220. When the slider 230 slides axially towards the proximal end, the stretching portion 120 is tightened. During the axial sliding process, the sliding member 231 of the slider 230 abuts against the blocking member 240, and the blocking member 240 exerts a blocking effect on the axial sliding of the slider 230 towards the proximal end. The slider 230 must overcome the blocking effect of the blocking member 240 when sliding axially towards the proximal end. Therefore, during the surgical process, even if the slider 230 is accidentally bumped, when the blocking effect of the blocking member 240 cannot be overcome, the slider 230 cannot slide axially along the guide rail 220, which is beneficial to avoiding misoperation.

[0108] Please refer to Figure 17 , in another embodiment, the blocking member 240 is received inside the guide rail 220. Specifically, the blocking member 240 is received in the gap 223 formed by the first guiding portion 221 and the second guiding portion 222. Moreover, the proximal end of the blocking member 240 abuts against the first fixing portion 224 of the guide rail 220. When the slider 230 slides axially along the guide rail 220, the mounting seat 232 of the slider 230 abuts against the blocking member 240, and the blocking member 240 exerts a blocking effect on the axial sliding of the slider 230 along the guide rail 20, which is beneficial to avoiding misoperation.

[0109] Whether the blocking member 240 is sleeved on the guide rail 220 or received inside the guide rail 220, the blocking member 240 is a helical spring or an elastic sleeve. When the blocking member 240 is sleeved on the guide rail 220, the shape of the blocking member 240 matches the shape of the guide rail 220. For example, the blocking member 240 is an equal-diameter helical spring. Or, the blocking member 240 is a cylindrical elastic sleeve. When the blocking member 240 is received inside the guide rail 220, on the premise of satisfying the abutment of the blocking member 240 with the first fixing portion 224 and the abutment of the slider 230 with the blocking member 240, the shape of the blocking member 240 is not limited.

[0110] In one embodiment, at least a part of the slider 230 is disposed in the gap 223 of the guide rail 220, and two connecting members 235 of the slider 230 extend out of the gap 230. In this embodiment, the blocking member 240 can be sleeved on the guide rail 220 or disposed in the gap 230 of the guide rail 220. Moreover, in this embodiment, the shape of the sliding member 231 needs to be adjusted so that the stretching portion 120 of the cutting member 10 can pass through the slider 230 and be connected to the slider 230. For example, the stretching portion 120 is connected to the slider 230 through the mounting seat 232 and the locking member 234, but the opening directions of the mounting seat 232 and the locking member 234 are different from those in the embodiment where the slider 230 is sleeved on the guide rail 220.

[0111] Please go back toFigure 2 and Figure 3 In the natural state, the cutting part 110 of the cutting assembly 10 is located outside the delivery catheter 30. During the delivery process, the cutting part 110 is also located outside the delivery catheter 30.

[0112] When the tissue cutting instrument 1 is delivered to the target position, before capturing the tissue to be cut, the cutting part 110 is arranged to be located outside the delivery catheter 30, so that when the tissue to be cut is captured into the inner cavity of the delivery catheter 30, the cutting part 110 surrounds the tissue to be cut for cutting. For the convenience of delivery and to avoid scratching the inner wall of the tissue and damaging the tissue during the delivery process, the common practice in the art is to accommodate all components in the delivery catheter before delivery. Moreover, the cutting assembly 10 is located in the cavity of the delivery catheter 30 and is supported by the inner wall of the delivery catheter 30, which is beneficial to avoid the problem that the cutting part 110 is deformed or displaced and cannot surround the tissue to be cut. Therefore, those skilled in the art naturally accommodate the cutting assembly in the delivery catheter.

[0113] However, after multiple creative efforts, the inventor found that when the cutting part 110 is pulled into the delivery catheter 30, and the tissue is pulled into the interior of the delivery catheter 30 (for example, the tissue is sucked into the delivery catheter 30 by means of vacuum suction) so that the cutting part 110 surrounds the tissue and then cuts, the aperture after cutting is small and the corresponding curative effect cannot be achieved. To solve this problem, the inventor tried many methods. For example, increasing the suction force to pull more tissue into the delivery catheter 30. However, this method is not easy to control the suction force. When the force is too large, it is easy to damage the tissue and there is a risk of tearing the tissue. Moreover, when the suction force is too large, if there is blood flow at the target position, too much blood will be pumped out, causing the patient to lose too much blood.

[0114] Therefore, the cutting part 110 of the tissue cutting instrument 1 is arranged to be located outside the delivery catheter 30 so as to cut a hole with a required aperture. To avoid damaging blood vessels by the cutting part 110 during the delivery process, a metal wire with a wire diameter of 0.1 - 0.2 mm is used to prepare the cutting part 110. In one embodiment, a metal wire with a wire diameter of 0.1 - 0.15 mm is used to prepare the cutting part 110. The cutting part 110 made of this specification is relatively soft and easy to deform, and is relatively easy to deform when being stretched to cut the tissue. Moreover, when using a metal wire with a wire diameter of 0.1 - 0.15 mm, less power is required when energized, which is beneficial to avoid the adverse effects on organisms caused by high temperature due to high power.

[0115] Moreover, the cutting part 110 of the tissue cutting instrument 1 is located outside the delivery catheter 30, avoiding interference with the traction assembly in the delivery catheter 30 to ensure the smooth progress of the operation.

[0116] The sliding of the slider 230 can pull the stretching part 120, thereby stretching the cutting part 110, so that the cutting part 110 with an outer contour similar to the outer contour of the number 8 is roughly deformed into a strip shape to cut tissue. It was accidentally found in multiple experiments that when there is a misoperation before the tissue is drawn into the inside of the delivery catheter 30, which causes the cutting part 110 to be stretched in advance, resulting in deformation or dislocation of the cutting part 110 and inability to surround the tissue to be cut, thus leading to cutting failure and prolonging the operation time, and even causing the operation to fail. Therefore, before the cutting part 110 surrounds the tissue to be cut, deformation or dislocation of the cutting part 110 should be avoided.

[0117] Therefore, the cooperation of the guide rail 220, the slider 230 and the blocking member 240 can not only realize the sliding of the slider 230 to pull the stretching part 120, but also avoid misoperation from causing the stretching part 120 to be pulled in advance and the cutting part 110 to be deformed or dislocated in advance, so as to ensure the smooth progress of the operation.

[0118] Moreover, in the cooperation of the guide rail 220, the slider 230 and the blocking member 240, when it is necessary to axially slide the slider 230 to drive the stretching part 120 to axially slide so as to tighten the cutting part 110 to achieve cutting, the operating member 236 can be directly manipulated to make the slider 230 axially slide by overcoming the blocking effect of the blocking member 240, without the need for additional unlocking before operation. It can be operated with one hand, which is convenient for operation and enables the operation to proceed smoothly.

[0119] When the cutting part 110 is deformed or dislocated in advance, since the cutting part 110 itself cannot automatically return to its position in the natural state, in order to be able to continue using the tissue cutting instrument 1 for cutting, it is necessary to manually place the cutting part 110 outside the delivery catheter 30, and keep the projection of the cutting part 110 on a plane perpendicular to the axial center axis of the delivery catheter 30 roughly surround the projection of the delivery catheter 30 on the same plane. By providing the connecting part 130 and making the connecting part 130 have sufficient length, when the cutting part 110 is deformed or dislocated in advance, a part of the connecting part 130 is still located in the channel 310 of the delivery catheter 30. In this way, even when the cutting part 110 is deformed or dislocated in advance, adjustment can still be made so that the connecting part 310 continues to extend into the channel 310, so that the cutting part 110 can return to its position and shape in the natural state to surround the tissue to be cut, and thus the tissue cutting instrument 1 can continue to be used for cutting.

[0120] Since the wire diameters of the cutting part 110 and the connecting part 130 are relatively small, it is difficult to fixedly connect the cutting part 110 and the connecting part 120. Therefore, the cutting part 110, the stretching part 120, and the connecting part 130 are formed by an integrally molded method. However, in this method, the closed end of the cutting part 110 and the connecting part 130 is the closed end of the connecting part 130. When the stretching part 120 is tightened for cutting, the closed end of the connecting part 130 abuts against the tissue to achieve cutting. Therefore, the axial sliding stroke of the stretching part 120 is the sum of the stroke causing the deformation of the cutting part 110 and the stroke causing the deformation of the connecting part 130. This necessarily requires a relatively large axial sliding stroke of the slider 230 to achieve the abutment of the closed end of the connecting part 130 with the tissue, thus requiring a correspondingly larger length of the guide rail 220. Correspondingly, the length of the housing 210 is also necessarily larger, which is not only inconvenient for transportation and storage, but also inconvenient for operation and takes a long operation time.

[0121] Therefore, in one embodiment, the cutting assembly 10 is configured as an integrally molded structure to facilitate preparation and avoid affecting the mechanical properties of the cutting assembly 10 due to connection and fixation. And this integrally molded structure includes a cutting part 110, a stretching part 120, a first connecting part 140, and a second connecting part 150. When the first connecting part 140 and the stretching part 120 respectively extend into the two channels 310, the cutting part 110 can be located outside the distal end face of the delivery catheter 30. On the premise that the projection of the cutting part 110 on the plane perpendicular to the axial center axis of the delivery catheter 30 substantially surrounds the projection of the delivery catheter 30 on the same plane, the length of the first connecting part 140 can be relatively short, as long as it can overlap with the second connecting part 150, so as to shorten the axial sliding stroke of the slider 230. The length of the second connecting part 150 does not affect the axial sliding stroke of the slider 230, and the second connecting part 150 can be set long enough so that it can still be adjusted in the case of premature deformation or misalignment of the cutting part 110, so as to continue cutting.

[0122] Therefore, after many creative attempts, the designed Figure 4 and Figure 5 The cutting assembly 10 of the embodiment shown takes into account the advantages of convenient preparation, mechanical properties, being able to be adjusted when misaligned, relatively small overall volume of the instrument, convenient operation, and saving operation time.

[0123] Through the cooperation of the guide rail 220, the slider 230, and the blocking part 240, it is beneficial to avoid premature pulling of the stretching part 120 caused by accidental touch, resulting in deformation or misalignment of the cutting part 110, and ensuring the smooth progress of the operation. At the same time, by reasonably designing the cutting assembly 10, even if the cutting assembly 10 is deformed or misaligned in extreme cases, it can still be manually adjusted to continue the operation.

[0124] In one embodiment, a damping edge may be provided on at least one of the first guiding portion 221, the second guiding portion 222, and the sliding member 231 of the slider 230. The damping edge cooperates with the blocking member 240, which helps to further prevent the cutting portion 110 from being deformed or displaced prematurely.

[0125] It should be noted that in other embodiments, the structures of the guide rail 220 and the slider 230 are not limited to the structures described above. For example, the guide rail 230 includes two parallel tracks, and both ends of each track are fixed in the housing 210 by fixing members respectively. Correspondingly, the slider 230 straddles the two tracks and can slide axially along the two tracks. Also, the blocking member 240 can be an elastic member, and the blocking member 240 is fixed between the two tracks. However, the structures of the guide rail 220, the slider 230, and the blocking member 240 cooperate with the housing 210, which is convenient for installation. During the installation process, no additional fasteners such as screws and bolts are required, nor is it necessary to use glue for fixing, and the shelf life is relatively long.

[0126] Another tissue cutting instrument 1 of an embodiment includes a cutting assembly 10, a control device 20, and a delivery catheter 30. The cutting assembly includes a cutting portion 110, a stretching portion 120, a first connecting portion 140, and a second connecting portion 150. Both the stretching portion 120 and the first connecting portion 140 are connected to the cutting portion 110, and the second connecting portion 150 is connected to the first connecting portion 140.

[0127] The control device 20 includes a housing 210 and an operating assembly at least partially received in the housing 210.

[0128] The housing 20 is connected to the delivery catheter 30. In the natural state, both the stretching portion 120, the first connecting portion 140, and the second connecting portion 150 extend into the delivery catheter 30, and the cutting portion 110 is located outside the delivery catheter 30.

[0129] The operating assembly includes a slider 230. The slider 230 is fixedly connected to the stretching portion 120. The slider 230 can slide axially along the housing 210, and the axial sliding of the slider 230 can drive the stretching portion 120 to slide axially so as to tension the cutting portion 110. When the cutting portion 110 is tensioned and deformed, at least a part of the second connecting portion 150 is located inside the delivery catheter 30.

[0130] The tissue cutting instrument 1 of the above embodiment helps to prevent the cutting assembly from being deformed or displaced. And even if the cutting assembly is deformed or displaced, it can be adjusted to continue cutting. Therefore, it is beneficial to ensure the smooth progress of cutting.

[0131] Moreover, the cutting portion 110, stretching portion 120, and first connecting portion 140 of the cutting assembly 10 of the tissue cutting instrument 1 of this embodiment are of an integral structure, and the second connecting portion 150 is lapped on the first connecting portion 140. The cutting assembly 10 with such a structure is relatively reliable, without weak parts that may cause the risk of being stretched and broken. Moreover, not only can the cutting assembly 10 be adjusted after deformation, but also the overall structure of the tissue cutting instrument 1 can be made more compact and smaller in size.

[0132] It should be noted that the tissue cutting instrument 1 of each of the above embodiments is used together with the tissue traction device. After the tissue is tractioned into the delivery catheter 30 by the tissue traction device, the tissue cutting instrument 1 is then used for cutting. For example, the tissue is adsorbed into the delivery catheter 30 by a negative pressure device communicated with the delivery catheter 30, and then the tissue cutting instrument 1 is used for cutting. Or, the tissue is tractioned into the delivery catheter 30 by a mechanical traction device that can axially slide in the delivery catheter 30 and then cutting is performed.

[0133] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0134] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An organization cutting instrument, comprising a cutting assembly and a control device, characterized in that, The cutting assembly includes a cutting part and a stretching part connected to the cutting part. The control device includes a housing and an operating assembly at least partially disposed in the housing. The operating assembly includes a guide rail, a blocking member, and a slider axially slidable relative to the guide rail. The guide rail is received in the housing. The blocking member is disposed outside the guide rail or received inside the guide rail. The stretching part is connected to the slider. The slider slides axially along the guide rail to drive the stretching part to slide axially, thereby tensioning the stretching part and deforming the cutting part. The blocking member forms a blocking effect on the axial sliding of the slider; The slider includes a sliding member and a mounting seat connected to the sliding member. The sliding member is sleeved on the guide rail. The stretching part is fixedly connected to the mounting seat; The slider further includes an operating part. The operating part includes a connecting member and an operating member. One end of the connecting member is fixedly connected to the outer wall of the sliding member, and the other end extends out of the housing and is located outside the housing and is connected to the operating member.

2. The tissue cutting instrument according to claim 1, wherein, The blocking member is an elastic member. The blocking member is sleeved on the guide rail or the blocking member is disposed inside the guide rail.

3. The tissue cutting instrument according to claim 1, wherein, The guide rail includes a first guiding part and a second guiding part. The first guiding part and the second guiding part are spaced apart to form a gap. The blocking member is sleeved on the first guiding part and the second guiding part or the blocking member is disposed in the gap between the first guiding part and the second guiding part.

4. The tissue cutting instrument according to claim 3, characterized in that, The guide rail further includes a first fixing part and a second fixing part. Two receiving cavities are formed on the second fixing part. One end of the first guiding part is fixedly connected to the first fixing part, and the other end is received in one of the receiving cavities and is movably connected to the second fixing part. One end of the second guiding part is fixedly connected to the first fixing part, and the other end is received in the other receiving cavity and is movably connected to the second fixing part.

5. The tissue cutting instrument according to claim 4, wherein The second fixing part includes a second body. The second body includes a base, a side edge, and a partition member. The side edge surrounds the side edge of the base. The partition member is disposed on the base. The base, the side edge, and the partition member form the two receiving cavities.

6. The tissue cutting instrument according to claim 5, wherein The first guiding part includes a first guiding member and two first abutting members disposed on the first guiding member. The second guiding part includes a second guiding member and two second abutting members disposed on the second guiding member. The two first abutting members and the two second abutting members both abut against the partition member.

7. The tissue cutting instrument according to claim 4, wherein The housing includes a first outer shell and a second outer shell that are detachably connected. When the first outer shell and the second outer shell are connected, a first receiving groove and a second receiving groove are formed. The first fixing part includes a first engaging member. The second fixing part includes a second engaging member. The first engaging member is received in the first receiving groove. The second engaging member is received in the second receiving groove to detachably fix the guide rail in the housing.

8. The tissue cutting instrument according to claim 3, wherein, The mounting seat divides the sliding member into two channels. The first guiding part and the second guiding part respectively pass through the two channels so that the sliding member is sleeved on the guide rail.

9. The tissue cutting instrument according to claim 1, wherein, The slider further includes a fastener. A receiving groove is formed in the mounting seat. The fastener is received in the receiving groove. The stretching portion passes through the mounting seat and the fastener and is locked.

10. The tissue cutting instrument according to claim 9, characterized in that, The fastener includes a first fastening portion and a second fastening portion. The second fastening portion is received in the first fastening portion. The stretching portion passes through the first fastening portion and the second fastening portion and is clamped by the first fastening portion and the second fastening portion.

11. The tissue cutting instrument according to claim 1, characterized in that, The cutting assembly further includes a first connecting portion and a second connecting portion. The cutting portion, the stretching portion and the first connecting portion are integrally formed. The first connecting portion includes two silk threads. The two silk threads are connected to form a closed end. The second connecting portion is lapped on the closed end of the first connecting portion.

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