Tissue traction devices

Abstract

The present invention relates to a tissue traction device, comprising a sheath, a traction member, a traction member control device and a pulling wire control device, wherein the traction member comprises a traction part, a connecting rod and a pulling wire, wherein the connecting rod passes through the traction part and is connected to the traction part, the pulling wire passes through the connecting rod and the distal end of the pulling wire is connected to the traction part, the traction member control device is connected to the connecting rod and is used to control the axial movement of the traction member relative to the sheath, the pulling wire control device is connected to the pulling wire and is used to control the axial movement of the pulling wire relative to the connecting rod, and a gap is formed between one end of the connecting rod away from the traction member control device and the distal end of the traction part. The above-mentioned tissue traction device pulls the tissue into the sheath through the traction part, and there is no need to use negative pressure, which can avoid the problems caused by negative pressure and improve reliability. In addition, the traction part can be deformed, which is conducive to forming a larger hole after cutting, and can avoid excessive deformation and breakage of the traction part, further improving reliability.

Description

Technical Field

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

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

[0003] Heart failure is a complex clinical syndrome caused by abnormal cardiac structure or function, which results in impaired ventricular filling or ejection capacity. Its main clinical manifestations are 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.

[0004] 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 the condition of normal ventricular contractile function, resulting in reduced ventricular filling volume and increased filling pressure, thus 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 is beneficial to reduce the pressure in the left atrium of patients with diastolic heart failure and improve the symptoms of heart failure patients.

[0005] At present, the main method of forming a small hole in the atrial septum by using interventional devices is to puncture the atrial septum and then use a balloon or stent to expand the puncture site to form a small hole. However, when the balloon is withdrawn, tissue rebound often occurs, causing the opening to shrink or even close. 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, whether balloon expansion or stent expansion is used, there is a risk of opening closure, resulting in poor patient prognosis.

[0006] Studies have shown that the method of directly cutting the atrial septum can maintain the existence of a small hole for a long time, and thus can effectively treat diastolic heart failure. This method is to cut off part of the tissue of the atrial septum to form a small hole, and the cut tissue needs to be recovered and transported out of the body to avoid embolism. In order to be able to recover the tissue cut from the atrial septum, one method is to suck the tissue into the sheath through a negative pressure device before cutting. Using negative pressure to attract tissue, on the one hand, it is convenient to attract tissue into the sheath for easy recovery, and on the other hand, it can attract enough tissue according to actual needs to form a hole that meets clinical size requirements after cutting. However, studies have found that the negative pressure effect has high requirements for sealing. When the cutting starts, a gap is formed at the distal end of the sheath, and the sealing is not tight, which easily makes the negative pressure fail. This will make the cutting difficult to control and have poor reliability, which may cause incomplete cutting, and the tissue is easy to grow again, thus making the treatment ineffective. Summary of the invention

[0007] Based on this, it is necessary to provide a tissue traction device that does not require the use of negative pressure, is conducive to forming larger holes after cutting, and has good reliability.

[0008] A tissue traction instrument comprises a sheath, a traction member, a traction member control device and a traction wire control device, the traction member comprises a traction portion, a connecting rod and a traction wire, the connecting rod passes through the traction portion and is connected to the traction portion, the traction wire passes through the connecting rod and the distal end of the traction wire is connected to the traction portion, the traction member control device is connected to the connecting rod and is used to control the axial movement of the traction member relative to the sheath, the traction wire control device is connected to the traction wire and is used to control the axial movement of the traction wire relative to the connecting rod, and an end of the connecting rod away from the traction member control device forms a gap with the distal end of the traction portion.

[0009] In one embodiment, the traction member control device includes a traction member fixing member, and the traction member fixing member includes a traction member fixing member and a traction member locking member. The traction member fixing member is provided with a through hole, and the traction member locking member is provided with a fastening hole. One end of the connecting rod away from the traction part extends into the fastening hole and is connected to the traction member locking member. The traction member locking member is received and fixed in the through hole so that the traction member is connected to the traction member fixing member.

[0010] In one embodiment, the through hole includes a first part, a second part and a third part which are arranged in sequence and connected, the aperture of the third part is larger than the aperture of the second part, the traction member locking component includes a first abutting portion and a second abutting portion connected to the first abutting portion, the outer diameter of the second abutting portion is larger than the outer diameter of the first abutting portion, the first abutting portion is accommodated in the second part, and the second abutting portion is accommodated in the third part, so that the end of the first abutting portion and the end of the second abutting portion both abut against the inner wall of the traction member fixing component.

[0011] In one embodiment, a mounting hole connected to the fastening hole is provided on the traction member locking component, a reinforcing tube is sleeved on the connecting rod, the connecting rod passes through the fastening hole, and the reinforcing tube is received in the mounting hole and abuts against the hole wall of the mounting hole.

[0012] In one embodiment, the traction member control assembly further includes a shell and a sleeve, wherein the traction member fixing component is partially accommodated in the shell, the sleeve is sleeved on the shell and can move axially along the shell, the traction member fixing member extends from the shell and is connected to the sleeve, and the axial movement of the sleeve drives the axial movement of the traction member fixing member.

[0013] In one of the embodiments, a receiving cavity and a window communicating with the receiving cavity are formed on the shell, a snap-fitting hole is formed on the sleeve, the traction member fixing member is accommodated in the receiving cavity, and the traction member fixing member extends from the window and extends to the sleeve and is embedded in the snap-fitting hole.

[0014] In one of the embodiments, the traction member control assembly further includes a limiting member, which can pass through the sleeve and be movably connected to the shell to limit the axial movement of the sleeve along the shell.

[0015] In one embodiment, a limiting groove or a limiting hole is formed on the shell, a limiting window is formed on the sleeve, and the limiting member includes a limiting plate, which can pass through the limiting window and be detachably engaged with the limiting groove or the limiting hole.

[0016] In one embodiment, the tissue traction instrument also includes an inner tube and an inner tube control device, wherein the inner tube control device is connected to the inner tube so that the inner tube can be axially movably accommodated in the sheath tube, the inner tube control device includes an inner tube fixing member and an inner tube driving member, the inner tube driving member is connected to the inner tube fixing member, the inner tube fixing member is connected to the inner tube, and the traction member control device allows the traction member to be axially movably accommodated in the inner tube.

[0017] In one embodiment, a spiral groove is formed on the inner wall of the inner tube driving member, and the inner tube fixing member cooperates with the spiral groove so that the inner tube driving member drives the inner tube fixing member to move axially when the inner tube driving member rotates.

[0018] In one embodiment, the traction member control assembly also includes a shell and a sleeve, the sleeve is sleeved on the shell and can move axially along the shell, the inner tube driving member is sleeved on the sleeve, the inner tube fixing member is accommodated in the shell, the inner tube fixing member extends from the shell and extends to the sleeve and extends from the sleeve, and is connected to the inner tube driving member.

[0019] In one embodiment, the pulling wire control device includes a pulling wire fixing member and a pulling wire driving member, the pulling wire driving member is connected to the pulling wire fixing member, and the pulling wire fixing member is connected to the pulling wire.

[0020] In one embodiment, the traction member control assembly also includes a shell and a sleeve, the sleeve is mounted on the shell and can move axially along the shell, the traction wire driving member is mounted on the sleeve, the traction wire fixing member is accommodated in the shell, the traction wire fixing member extends from the shell and extends to the sleeve and extends from the sleeve, and is connected to the traction wire driving member.

[0021] In the above-mentioned tissue traction instrument, a traction wire is provided through a connecting rod, and the distal end of the traction wire is connected to the traction part, so that under the action of the traction member control device, when the traction wire moves in the distal direction away from the traction part and is tightened, the traction part is deformed to increase the contact area between the traction part and the tissue to be cut, which is conducive to pulling more tissue and forming a hole with a larger aperture after cutting, so as to meet clinical use requirements. Furthermore, a gap is formed between the end of the connecting rod away from the traction member control device and the distal end of the traction part, so that when the traction wire is tightened to a certain extent, the traction part abuts against the distal end of the connecting rod and cannot be pulled further, which is conducive to avoiding excessive deformation of the traction part due to excessive tightening of the traction wire, and thus is conducive to avoiding breakage of the traction part.

[0022] Therefore, the tissue traction device can pull the tissue into the sheath tube through the traction part without using negative pressure, which can avoid the problems caused by negative pressure and improve reliability. In addition, the traction part can be deformed to form a larger hole after cutting, and can avoid the traction part from being broken due to excessive deformation, further improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] in:

[0025] Figure 1 It is a structural schematic diagram of a tissue traction device according to an embodiment;

[0026] Figure 2 for Figure 1 A partial enlarged view of

[0027] Figure 3 It is a structural schematic diagram of a traction member according to an embodiment;

[0028] Figure 4 is a schematic structural diagram of a traction member according to another embodiment;

[0029] Figure 5 It is a partial structural schematic diagram of a tissue traction device according to an embodiment;

[0030] Figure 6 It is a partial structural schematic diagram of a tissue traction device according to an embodiment;

[0031] Figure 7 is an exploded schematic diagram of a housing of an embodiment;

[0032] Figure 8 is a schematic structural diagram of a housing according to an embodiment;

[0033] Fig. 9 It is a structural schematic diagram of a traction member fixing component of an embodiment;

[0034] Fig.10 It is a structural schematic diagram of a locking component of a traction member according to an embodiment;

[0035] Fig.11 is a cross-sectional view of a traction member fixing component of an embodiment;

[0036] Fig.12 for Fig.10 A schematic structural diagram of the traction member locking component from another angle shown;

[0037] Fig.13 for Fig.12 A schematic cross-sectional view of the mounting hole shown;

[0038] Fig.14 is an exploded schematic diagram of a sleeve according to an embodiment;

[0039] Fig.15 It is a structural schematic diagram of a first set of sleeves of an embodiment;

[0040] Fig.16 It is a structural schematic diagram of the second set of sleeves of one embodiment;

[0041] Fig.17 is an exploded schematic diagram of a surrounding piece according to an embodiment;

[0042] Fig.18 for Fig.17 A partial enlarged view of

[0043] Fig.19 This is a schematic structural diagram of a position limiting member according to an embodiment;

[0044] Fig. 20 for Fig.19 A schematic diagram of the structure of the other side of the limiting member shown;

[0045] Fig.21 is a schematic structural diagram of an elastic member according to an embodiment;

[0046] Fig. 22 is an exploded schematic diagram of an inner tube fixing member of an embodiment;

[0047] Fig.23 This is a schematic structural diagram of a locking cap according to an embodiment;

[0048] Fig.24 is an exploded schematic diagram of an inner tube driving member of an embodiment;

[0049] Fig.25 for Fig.24 An exploded schematic diagram of the inner tube driving member shown in another angle;

[0050] Fig.26 This is a schematic structural diagram of a pull wire fixing member according to an embodiment;

[0051] Fig. 27 It is an exploded schematic diagram of a pulling wire driving member according to an embodiment;

[0052] Fig.28 for Fig. 27 A schematic exploded view of the inner tube drive shown in another angle. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the description of the embodiments of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0055] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0056] In the field of interventional medical devices, the end of a medical device implanted in a human or animal body that is closer to the operator is generally 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 a medical device are defined based on this principle. "Axial" generally refers to the length direction of the medical device when it is transported, and "radial" generally refers to the direction of the medical device that is perpendicular to its "axial direction", and the "axial" and "radial" of any component of a medical device are defined based on this principle.

[0057] See also Figure 1 A tissue traction device 1 of one embodiment includes a sheath 10, a traction member 20 and a traction member control device 30. The traction member control device 30 is used to activate the traction member 20 to pull the tissue, so as to pull the tissue to be cut into the sheath 10, so that the cut tissue is accommodated in the sheath 10 after cutting, and will not enter the blood circulation system to cause embolism, and the cut tissue is transported out of the biological body with the help of the sheath 10.

[0058] The sheath tube 10 is a hollow elongated tube. The sheath tube 10 has a distal end and a proximal end, and the proximal end of the sheath tube 10 is fixedly connected to the traction member control device 30. Figure 1 As shown, the distal end of the sheath tube 10 is curved to facilitate passing through the curved tubular structure in the body.

[0059] Please also read Figure 2 and Figure 3The traction member 20 includes a traction portion 210 and a connecting rod 220 connected to the traction portion 210. The traction member 20 can move axially along the sheath tube 10. The traction portion 210 has an abutment surface 211 for abutting against tissue. After the traction portion 210 passes through the tissue, the abutment surface 211 of the traction portion 210 abuts against the tissue, and then the connecting rod 220 is pulled proximally to pull the tissue into the sheath tube 10.

[0060] In one embodiment, the traction part 210 includes a plurality of support rods 212, and the two ends of the plurality of support rods 212 converge to form the distal end and the proximal end of the traction part 210, respectively, to form a frame structure with an inner cavity. The proximal end of the traction part 210 is connected to the distal end of the connecting rod 220. The proximal end surfaces of the plurality of support rods 212 constitute the abutment surface 211 of the traction part 210.

[0061] In one embodiment, two fixing sleeves 214 are respectively provided at both ends of the traction part 210, and the two fixing sleeves 214 are used to gather and fix the multiple support rods 212. The two fixing sleeves 214 and the multiple support rods 212 are an integrated structure. Alternatively, the fixing sleeves 214 and the support rods 212 are independent structures, and are connected to form the traction part 210 by a connection method known to those skilled in the art, such as welding, bonding, etc.

[0062] like Figure 3 As shown, in one embodiment, the connecting rod 220 extends into the fixing sleeve 214 at the proximal end and is fixedly connected to the fixing sleeve 214. In addition, the distal end of the connecting rod 220 extends into the traction portion 210, and a gap is formed between the distal end of the connecting rod 220 and the distal end of the traction portion 210. That is, a gap is formed between the distal end surface of the connecting rod 220 and the distal inner end surface of the traction portion 210.

[0063] In one embodiment, the traction part 210 further includes an anchor barb 213, which is connected to the support rod 212 and faces the proximal end surface of the support rod 212. When the abutting surface 211 of the traction part 210 abuts against the tissue, the anchor barb 213 penetrates into the tissue, which helps to avoid the traction part 210 directly passing through the puncture hole and causing tissue traction failure during the process of pulling the traction part 210 proximally to pull the tissue into the sheath tube 10.

[0064] In one embodiment, the number of anchor spikes 213 corresponds to the number of support rods 212, that is, each support rod 212 is provided with an anchor spike 213. In another embodiment, the number of anchor spikes 213 is less than the number of support rods 212, that is, some support rods 212 are not provided with anchor spikes 213.

[0065] The traction portion 210 is a self-expanding structure. When the radial restraint on the traction portion 210 disappears, the traction portion 210 automatically returns to its natural state.

[0066] See also Figure 3 In one embodiment, the traction member 20 further includes a pulling wire 230. The connecting rod 220 has an inner cavity extending in the axial direction and open at both ends. The pulling wire 230 passes through the connecting rod 220 and extends into the traction part 210, and the distal end of the pulling wire 230 is connected to the traction part 210. When the pulling wire 230 is pulled toward the proximal end, relative to the form in the natural state (the natural state refers to the state in which the tissue traction instrument 1 is assembled and not used, or the state in which no external force is applied, and the natural state hereinafter has the same meaning and will not be repeated), the support rod 212 can be deformed to increase the radial dimension of the traction part 210 and increase the radial length of the proximal end face, thereby increasing the area of ​​the abutting surface 211 of the traction part 210, which is conducive to pulling more tissues and forming a hole with a larger aperture after cutting to meet clinical requirements.

[0067] See also Figure 4 In one embodiment, the structure of the traction member 20 is Figure 3 The structure of the embodiment shown is different. The traction member 20 of this embodiment includes a traction portion 210 and a connecting rod 220. Among them, the traction portion 210 includes a disc-shaped structure 215 and a plurality of anchor thorns 216, and the plurality of anchor thorns 216 are distributed at intervals along the circumference of the disc-shaped structure 215, and each anchor thorn 216 extends from the edge of the disc-shaped structure 215 to the proximal end. In a natural state, the disc-shaped structure 215 is disc-shaped. The disc-shaped structure 215 can be formed by braiding wire and then shaping. The connecting rod 220 is connected to the middle part of the disc-shaped structure 215. The disc-shaped structure 215 is a self-expanding structure. When the traction portion 210 is pushed to the outside of the sheath 10 through the connecting rod 220, the disc-shaped structure 215 automatically expands and becomes disc-shaped.

[0068] Please also read Figure 5 and Figure 6 The traction member control device 30 includes a housing 310 and a traction member control assembly at least partially received in the housing 310. The traction member control assembly includes a traction member fixing member 320 and a stop member 330.

[0069] The traction member fixing member 320 can move axially. The traction member fixing member 320 is connected to the traction member 20, and the axial movement of the traction member fixing member 320 drives the traction member 20 to move axially. During the transportation process, the traction member 20 is accommodated in the sheath tube 10. After reaching the target position, the traction member fixing member 320 drives the traction member 20 to move distally so that at least part of the traction member 20 extends outside the sheath tube 10. After the traction member 20 abuts against the tissue, the traction member fixing member 320 drives the traction member 20 to move proximally to pull the tissue into the inner cavity of the sheath tube 10.

[0070] The stopper 330 is used to limit the axial movement of the traction member fixing member 320. After the limit of the stopper 330 is released, the traction member fixing member 320 can move axially to drive the traction member 20 to move axially. After the tissue is pulled into the sheath tube 10, the stopper 330 is locked to lock the relative position of the traction member 20 and the sheath tube 10, so that the tissue to be cut is relatively stably accommodated in the sheath tube 10 to facilitate cutting.

[0071] See also Figure 7 In one embodiment, the housing 310 includes a first housing 311 and a second housing 312, which are detachably connected to form a receiving cavity, and the traction member control assembly is at least partially received in the receiving cavity. The proximal end of the sheath tube 10 extends into the receiving cavity and is connected to the housing 310.

[0072] In one embodiment, the first housing 311 includes a first gripping portion 3111 and a first accommodating portion 3112 connected to the first gripping portion 3111, and the second housing 312 includes a second gripping portion 3121 and a second accommodating portion 3122 connected to the second gripping portion 3121. When the first housing 311 and the second housing 312 are connected, the first gripping portion 3111 and the second gripping portion 3121 are opposite in the radial direction to form a gripping portion, and the gripping portion has a receiving cavity. The first accommodating portion 3112 and the second accommodating portion 3122 are opposite in the radial direction to form the above-mentioned accommodating cavity. The accommodating cavity is located at the distal end, the accommodating cavity is located at the proximal end, and the accommodating cavity is communicated with the accommodating cavity.

[0073] The gripping part is provided so that during operation, one hand holds the gripping part and the other hand operates other components of the traction member control assembly, so as to facilitate the operation and make the operation more stable. The gripping part has a receiving cavity so that the connecting rod 220 of the traction member 20 passes through the gripping part and extends into the receiving cavity to be connected with the traction member fixing member 320 of the traction member control assembly. In addition, the receiving cavity of the gripping part can also accommodate other components to make the structure of the entire device more compact.

[0074] Please go back Figure 5 In one embodiment, the housing 310 further includes a first locking cover 313 and a second locking cover 314. The first locking cover 313 is simultaneously sleeved on the distal ends of the first housing 311 and the second housing 312 and locked, and the second locking cover 314 is simultaneously sleeved on the proximal ends of the second housing 311 and the second housing 312 and locked, so that the first housing 311 and the second housing 312 are detachably connected.

[0075] In one embodiment, if Figure 7As shown, the distal end and proximal end of the first housing 311 are respectively provided with threads 3113 and 3114, and the distal end and proximal end of the second housing 312 are respectively provided with threads 3123 and 3124. The inner wall of the first locking cover 313 is provided with threads, and the inner wall of the second locking cover 314 is provided with threads. The first locking cover 313 and the second locking cover 314 are detachably connected to the first housing 311 and the second housing 312 through threads.

[0076] It can be understood that in other embodiments, the first shell 311 and the second shell 312 are not limited to threaded connection, for example, they can be detachably connected by means of snap-fit, or they can be detachably connected by means of screws or bolts.

[0077] In one embodiment, two radially opposite first notches 3115 are formed on the first shell 311, and two radially opposite second notches 3125 are formed on the second shell 312. The first notch 3115 is located in the first accommodating portion 3112, and the second notch 3125 is located in the second accommodating portion 3122. When the first shell 311 and the second shell 312 are connected, the first notch 3115 and the second notch 3125 are opposite to each other, and two windows are formed on both sides of the axial center axis of the shell 310, and both windows are connected to the accommodating cavity of the shell 310.

[0078] Please also read Figure 7 and Figure 8 In one embodiment, a limiting hole 3116 is provided on the first shell 311. In another embodiment, when the thickness of the first shell 311 is large enough, a limiting groove may be provided on the first shell 311 to replace the limiting hole 3116. Moreover, the opening of the limiting groove is located outside the first shell 311.

[0079] There are multiple limiting holes 3116 or limiting grooves, and the multiple limiting holes 3116 or limiting grooves are arranged at intervals along the axial direction. In one embodiment, the number of limiting holes 3116 or limiting grooves is 2 to 20, so that they can be limited at multiple different positions. In one embodiment, the number of limiting holes 3116 or limiting grooves is 5 to 10, so that they can be limited at multiple different positions, and the length of the housing 310 is taken into account so that the housing 310 is not too long.

[0080] Please also read Figure 6 , 9 and Fig.10 In one embodiment, the traction member fixing member 320 includes a traction member fixing member 321 and a traction member locking member 322. The traction member fixing member 321 and the traction member locking member 322 are connected to the connecting rod 220 of the traction member 20, so that the traction member fixing member 320 can drive the traction member 20 to move axially when the traction member fixing member 320 moves axially.

[0081] The traction member fixing part 321 is substantially cylindrical. In one embodiment, the traction member fixing part 321 is provided with an axially extending through hole 3211. Fig. 9 and Fig.11 As shown, the through hole 3211 axially extends from one end of the traction member fixing component 321 to the other end. Fig.11 In one embodiment, along the axial direction, from the distal end to the proximal end, the through hole 3211 includes a first portion 3211A, a second portion 3211B and a third portion 3211C arranged in sequence, and the first portion 3211A, the second portion 3211B and the third portion 3211C are connected. In addition, the aperture of the second portion 3211B is larger than the aperture of the first portion 3211A, and the aperture of the third portion 3211C is larger than the aperture of the second portion. The proximal end of the third portion 3211C is an open end.

[0082] Please go back Fig.10 The traction member locking member 322 is provided with a fastening hole 3221, and the fastening hole 3221 axially extends from one end of the traction member locking member 322 to the other end. The connecting rod 220 extends into the fastening hole 3221 and is connected to the traction member locking member 322. The traction member locking member 322 extends into and is detachably or non-detachably fixed to the through hole 3211 of the traction member fixing member 321, thereby connecting the traction member 20 to the traction member fixing member 320.

[0083] See also Fig.12 In one embodiment, the traction member locking component 322 includes a first abutting portion 3222 and a second abutting portion 3223 connected to the first abutting portion 3222. The first abutting portion 3222 and the second abutting portion 3223 are both hollow cylindrical, and the inner cavity of the first abutting portion 3222 and the inner cavity of the second abutting portion 3223 are connected to form a fastening hole 3221. The outer diameter of the second abutting portion 3223 is greater than the outer diameter of the first abutting portion 3222. Please refer to Fig.11 When the traction member locking component 322 is extended into the through hole 3211 of the traction member fixing component 321, the first abutting portion 3222 is received in the second portion 3211B of the through hole 3211, and the second abutting portion 3223 is received in the third portion 3211C, so that the end of the first abutting portion 3222 abuts against the inner wall of the traction member fixing component 321, and the end of the second abutting portion 3223 abuts against the inner wall of the traction member fixing component 321, which is conducive to the reliable connection between the traction member locking component 322 and the traction member fixing component 321.

[0084] Please also read Fig.10 and Fig.12 In one embodiment, a mounting hole 3224 is provided on the wall of the traction member locking component 322 , and the mounting hole 3224 is communicated with the fastening hole 3221 .

[0085] Please also read Fig.13 , along the axial direction, from the distal end to the proximal end, the mounting hole 3224 includes a first opening portion 3224A, a second opening portion 3224B and a third opening portion 3224C which are axially connected. The width of the second opening portion 3222B is greater than the width of the first opening portion 3224A and the second opening portion 3224C, and the distal end of the first opening portion 3224A is an open end.

[0086] In one embodiment, a reinforcing tube (not shown) is sleeved on the portion of the connecting rod 220 that is connected to the traction member locking component 322. After the connecting rod 220 passes through the through hole 3221, the portion sleeved with the reinforcing tube is pressed into the mounting hole 3224 from the outside, so that the reinforcing tube is located in the second opening portion 3224B of the mounting hole 3224, and the two ends of the reinforcing tube are respectively abutted against the hole wall of the mounting hole 3224, so that the connecting rod 220 is embedded in the fastening hole 3221 of the traction member locking component 322 and is connected to the traction member locking component 322.

[0087] It should be noted that, in other embodiments, the reinforcing tube can be omitted, and the mounting hole 3224 can also be omitted, and the connecting rod 220 can be fixedly connected to the traction member locking component 322 by bonding. However, by providing the reinforcing tube and the mounting hole 3224, the connection between the connecting rod 220 and the traction member locking component 322 is more convenient and more reliable. In addition, the reinforcing tube is short in length and is only sleeved on the connecting end of the connecting rod 220, which will not affect the conveying performance of the tissue traction device 1.

[0088] In one embodiment, an adhesive layer is further provided between the connecting member 220 and the traction member locking member 322 to further make the connection between the connecting member 220 and the traction member locking member 322 more reliable. The adhesive layer is formed between the connecting member 220 and the traction member locking member 322 by pouring adhesive at the mounting hole 3224.

[0089] It should be noted that, in other embodiments, the third opening portion 3224C of the mounting hole 3244 can be omitted, and the mounting hole 3244 only includes the first opening portion 3224A and the second opening portion 3224B, which can also reliably connect the connecting rod 220 and the traction member locking component 322. However, when an adhesive layer is required, the third opening portion 3224C is provided so that the condition of the glue can be observed during the process of pouring the glue, so as to prevent the glue from flowing out of the traction locking component 322 and causing undesirable bonding. For example, the glue is prevented from connecting the connecting rod 220 and the pulling wire 230.

[0090] By properly setting the shape and size of the traction member locking member 322 and the shape and size of the through hole 3211, the traction member locking member 322 is embedded in the traction member fixing member 321. In another embodiment, the traction member locking member 322 is fixed in the through hole 3211 of the traction member fixing member 321 by bonding.

[0091] The rod diameter of the connecting rod 220 is relatively small, and the traction member fixing part 321 cooperates with the traction member locking part 322 to more reliably connect the traction member fixing part 320 and the connecting rod 220, thereby avoiding damage to the connecting rod 220 during the connection process and affecting its mechanical properties.

[0092] Please go back Fig. 9 In one embodiment, the traction member fixing member 320 further includes two engaging members 323, which are connected to the traction member fixing member 321 and are respectively located on both sides of the traction member fixing member 321. The traction member fixing member 321 and the two engaging members 323 are integrally formed, or the two engaging members 323 are fixed to both sides of the traction member fixing member 321 by a fixed connection method known to those skilled in the art, including but not limited to welding, bonding, etc.

[0093] In one embodiment, the two engaging parts 323 are connected by a sleeve. The two engaging parts 323 and the sleeve are an integrated structure. The sleeve is sleeved on the traction member fixing part 321 so that the two engaging parts 323 are located on both sides of the traction member fixing part 321.

[0094] Please go back Figure 5 In one embodiment, the traction member control assembly further includes a sleeve 340. The sleeve 340 is sleeved on the housing 310 and can move axially along the housing 310. The traction member fixing member 320 is connected to the sleeve 340, and the axial movement of the sleeve 340 along the housing 310 drives the traction member fixing member 320 to move axially along the housing 310.

[0095] See also Fig.14 In one embodiment, the sleeve 340 includes a first set 341 and a second set 342, and the first set 341 and the second set 342 are detachably connected. When the first set 341 and the second set 342 are connected, a hollow structure with two ends opened is formed, so that the sleeve 340 can be sleeved on the housing 310.

[0096] Please also read Fig.15 and Fig.16 Two first engaging grooves 3411 are formed on the first set 341, and two second engaging grooves 3421 are formed on the second set 342. When the first set 341 and the second set 342 are connected, the two first engaging grooves 3411 and the two second engaging grooves 3421 are respectively opposite to each other to form two engaging holes opposite to each other in the radial direction.

[0097] The traction member fixing member 320 is disposed in the accommodating cavity of the housing 310, and the two engaging parts 323 of the traction member fixing member 320 extend from the two windows of the housing 310 respectively, and are respectively embedded in the two engaging holes of the sleeve 340, so that the traction member fixing member 320 is connected to the sleeve 340. When the sleeve 340 moves axially along the housing 310, the traction member fixing member 320 is driven to move axially along the housing 310.

[0098] Please continue reading Fig.15 In one embodiment, a limiting window 3412 is provided on the first set 341, and the limiting window 3412 is communicated with the inner cavity of the sleeve 340. Two installation grooves 3413 are respectively provided on two radially opposite sides of the limiting window 3412.

[0099] In one embodiment, a receiving groove 3414 is further provided on the first set 341 , and the receiving groove 3414 is located at the proximal end of the limiting window 3412 . A mounting column 3417 is provided on the bottom of the receiving groove 3414 .

[0100] In one embodiment, a first protrusion 3415 is formed in the middle of the first set 341. The limiting window 3412, the receiving groove 3414 and the first engaging groove 3411 are all located on the first protrusion 3415. Two first stoppers 3416 are formed on both sides of the first set 341.

[0101] Please continue reading Fig.16 A second protrusion 3425 is formed in the middle of the second set 342. Second stoppers 3426 are formed on both sides of the second set 342.

[0102] When the first set 341 and the second set 342 are connected, the first protrusion 3415 and the second protrusion 3425 are opposite to each other, forming a protrusion of the sleeve 340. In one embodiment, the protrusion is cylindrical. In addition, when the first set 341 and the second set 342 are connected, four strip holes are formed, and the four strip holes are located on both sides of the protrusion in pairs. Each strip hole extends in the axial direction, and each strip hole is connected to the inner cavity of the sleeve 340. In addition, the two strip holes on each side of the protrusion are opposite in the radial direction.

[0103] The two first stops 3416 and the two second stops 3426 are respectively opposite to each other in the radial direction, forming two stops located on both sides of the sleeve 340 .

[0104] In one embodiment, the first set 341 and the second set 342 are detachably connected by snap-fitting. In other embodiments, other methods can be used for detachable connection, for example, including but not limited to screws or screw fitting.

[0105] Please go back Figure 5The traction member control assembly further includes a surrounding member 350, and the surrounding member 350 is coated on the sleeve 340. Specifically, the surrounding member 350 is coated on the middle part of the sleeve 340. In one embodiment, when the sleeve 340 includes a protrusion, the surrounding member 350 is coated on the protrusion.

[0106] See also Fig.17 In one embodiment, the enclosure 350 includes a first enclosure portion 351 and a second enclosure portion 352, and the first enclosure portion 351 and the second enclosure portion 352 are detachably connected to form the enclosure 350. The enclosure 350 is a hollow structure with an inner cavity with two ends open. In one embodiment, the inner cavity of the enclosure 350 is a cylindrical inner cavity to adapt to the protrusion of the sleeve 340.

[0107] In one embodiment, a receiving hole 3511 is formed on the first surrounding portion 351. Fig.18 Two slots 3512 are respectively formed on both sides of the receiving hole 3511. When the surrounding member 350 is sleeved on the sleeve 340, the two installation slots 3413 of the first set 341 are respectively opposite to the two slots 3512 of the surrounding member 350 to form two receiving slots.

[0108] See also Fig.19 In one embodiment, the limiting member 330 includes a limiting piece 331. The limiting piece 331 can pass through the limiting window 3412 of the sleeve 340 and extend to the first shell 311 to be detachably engaged with the limiting hole 3116, so as to limit or release the limit. When the traction member control device 30 further includes a surrounding member 350, the limiting piece 331 passes through the receiving hole 3511, then passes through the limiting window 3412 and extends to the limiting hole 3116 to be detachably engaged with the limiting hole 3116.

[0109] Please also read Fig.19 and Fig. 20 In one embodiment, the limiting member 330 further includes an operating portion 332 and two mounting portions 333 connected to the operating portion 332. The two mounting portions 333 are respectively located on both sides of the operating portion 332. One end of the limiting piece 331 is connected to the bottom surface of the operating portion 332, and the other end extends so that the limiting piece 331 is approximately perpendicular to the operating portion 332. The two mounting portions 333 of the limiting member 330 are respectively received in two receiving grooves formed by the first surrounding portion 351 and the first kit 341. The operating portion 332 of the limiting member 330 is at least partially received in the receiving hole 3511, and partially protrudes out of the receiving hole 3511 for easy operation.

[0110] In one embodiment, the limiting piece 331 , the operating portion 332 and the two mounting portions 333 are an integrated structure.

[0111] See also Fig.21In one embodiment, the stopper 330 further includes an elastic member 334. One end of the elastic member 334 is connected to the operating portion 332, and the other end is connected to the first set 341.

[0112] In one embodiment, the elastic member 334 is a compression spring. Fig. 20 A mounting groove 3321 is provided on one side of the operating portion 332 , one end of the compression spring is received and fixed in the mounting groove 3321 , and the other end is sleeved on the mounting column 3417 of the first set 341 .

[0113] In a natural state, the compression spring is in an uncompressed state or a partially compressed state, and the compression spring pushes up the proximal end of the operating portion 332, causing the operating portion 332 to tilt toward the distal end, thereby prompting the limiting piece 331 to move downward and insert into the limiting hole 3116 of the first shell 311, thereby achieving the limiting effect. When the limiting effect needs to be released, the proximal end of the operating portion 332 is pressed, and the compression spring changes from an uncompressed state to a compressed state, or from a partially compressed state to a further compressed state, and the distal end of the operating portion 332 is tilted, and the limiting piece 331 pops out of the limiting hole 3116, thereby releasing the limiting effect.

[0114] The above-mentioned tissue traction device 1 drives the axial movement of the traction member 20 through the axial movement of the traction member fixing member 320, so as to extend the traction member 20 out of the sheath tube 10, so that the traction member 20 abuts against the tissue, and then, driven by the traction member fixing member 320, the traction member 320 is accommodated in the interior of the sheath tube 10, so that the tissue is pulled into the interior of the sheath tube 10, and then the limiter 330 is locked. There is no need to use negative pressure, which can avoid the problem of unstable negative pressure attraction due to poor sealing, so that the tissue can be relatively stably accommodated in the sheath tube 10 to facilitate cutting. There is no need to use negative pressure, and the requirements for sealing are low. The tissue can be reliably pulled into the sheath tube 10, making cutting easier. In addition, the problem of incomplete cutting due to poor sealing can be avoided.

[0115] By providing the traction member 20, the traction member control device 30 and the limit member 330, negative pressure adsorption can be avoided. After the tissue is pulled into the sheath tube 10 by the traction member control device 30, it is locked by the limit member 330. During the cutting process, the tissue can be stably maintained in the sheath tube 10, which is not only conducive to making the shape of the small hole formed after cutting good, but also avoids the adsorption of blood during the negative pressure adsorption process to cause excessive blood loss to the patient, thereby improving the safety of the operation.

[0116] Please go back Figure 1 and Figure 2The tissue traction device 1 further comprises an inner tube 40 and an inner tube control device 50, wherein the inner tube control device 50 is connected to the inner tube 40, and the inner tube 40 is axially slidably received in the sheath tube 10 through the inner tube control device 50. The traction member 20 is axially slidably received in the inner tube 40 through the traction member control device 30.

[0117] See also Figure 2 The tissue traction device 1 further includes a puncture member 60, which is disposed at the distal end of the traction portion 210. For example, the puncture member 60 is connected to the fixing sleeve 214 at the distal end of the traction portion 210.

[0118] In order to pull the tissue, the traction member 20 needs to pass through the tissue and abut against the tissue, and then pull the traction member 20 toward the proximal end to pull the tissue into the sheath 10. The traction member 20 is passed through the tissue with the help of the puncture member 60 and the inner tube 40. After passing through the tissue, in order to pull the tissue into the sheath 10, the inner tube 40 needs to be withdrawn first, so that the inner tube 40 is accommodated in the sheath 10, and the distal end surface of the inner tube 40 should be kept at a certain distance from the distal end surface of the sheath 10 to keep a certain space for accommodating the traction member 20 and the tissue. The inner tube control device 50 is operated to pull the inner tube 40 toward the proximal end, so that the inner tube 40 is withdrawn, the traction member 20 is released, and the traction member 20 is radially expanded to pull the tissue.

[0119] See also Figure 6 In one embodiment, the inner tube control device 50 includes an inner tube fixing member 510 and an inner tube driving member 520, wherein the inner tube fixing member 510 is connected to the inner tube driving member 520, and the inner tube fixing member 510 is connected to the inner tube 40. The inner tube driving member 520 drives the inner tube fixing member 510 to move axially, thereby driving the inner tube 40 to move axially.

[0120] See also Fig. 22 In one embodiment, the inner tube fixing member 510 includes an inner tube fixing component 511 and an inner tube locking component 512 .

[0121] In one embodiment, the inner tube fixing component 511 is provided with an inner cavity 5111 which extends axially and is open at both ends. The inner cavity 5111 extends axially from one end of the inner tube fixing component 511 to the other end.

[0122] The inner tube locking component 512 includes a connecting area 5121 and a locking area 5122 connected to the connecting area 5121. The connecting area 5121 is provided with a first through hole extending axially, and the locking area 5122 is provided with a second through hole extending axially. The first through hole and the second through hole are connected. The inner tube 40 passes through the first through hole and the second through hole and is connected to the inner tube locking component 512.

[0123] The connection area 5121 and at least a portion of the locking area 5122 extend into the inner cavity of the inner tube fixing component 511 and are connected to the inner tube fixing component 511. In one embodiment, the connection area 5121 and the inner tube fixing component 511 are connected by gluing.

[0124] See also Fig.23 In another embodiment, the inner tube fixing component 511 further includes a locking cap 513. An inner wall of the locking cap 513 is provided with an internal thread, and the inner tube fixing component 511 is provided with an external thread 5112. The locking cap 513 is sleeved on the inner tube fixing component 511 and is detachably connected to the inner tube fixing component 511, so that the inner tube locking component 512 and the inner tube fixing component 511 are connected.

[0125] Please go back Fig. 22 In one embodiment, the inner tube fixing member 510 further includes two snap-fitting pieces 514, both of which are connected to the inner tube fixing member 511 and are respectively located on both sides of the inner tube fixing member 511. The inner tube fixing member 511 and the two snap-fitting pieces 514 are integrally formed, or fixedly connected by a method known to those skilled in the art, including but not limited to welding, bonding, etc., so that the two snap-fitting pieces 514 are fixed to both sides of the inner tube fixing member 511. A snap-fitting groove 5142 is provided on the side end of the snap-fitting piece 514.

[0126] See also Fig.24 The inner tube drive member 520 includes a first inner tube drive portion 521 and a second inner tube drive portion 522. The first inner tube drive portion 521 and the second inner tube drive portion 522 are detachably connected to form a sleeve structure with two ends open. The inner tube drive member 520 is sleeved on the sleeve 340 and is rotatable relative to the sleeve 340.

[0127] See also Fig.25 In one embodiment, a plurality of first strip grooves 5211 are provided on the inner wall of the first inner tube driving portion 521, and a plurality of second strip grooves 5221 are provided on the inner wall of the second inner tube driving portion 522. When the first inner tube driving portion 521 and the second inner tube driving portion 522 are connected, the first strip grooves 5211 and the second strip grooves 5221 form a spiral groove.

[0128] The inner tube fixing member 510 is accommodated in the accommodating cavity of the housing 310, and the two engaging pieces 514 of the inner tube fixing member 510 extend out of the two windows of the housing 310 respectively, and further extend out of the two strip-shaped holes on one side of the protruding portion of the sleeve 340, so that the engaging grooves 5142 at the side ends of the two engaging pieces 514 cooperate with the spiral groove, so that the inner tube fixing member 510 is embedded in the spiral groove, and when the inner tube driving member 520 rotates relative to the sleeve 340, the engaging piece 514 slides along the spiral groove to make the inner tube fixing member 510 move axially relative to the housing 310. When the sleeve 340 moves axially along the housing 310 as a whole, the inner tube fixing member 510 can also move axially relative to the housing 310.

[0129] Please go back Figure 1 and Figure 5 The tissue traction device 1 further includes a pulling wire control device 70 . The pulling wire control device 70 is connected to the pulling wire 230 and is used to control the axial movement of the pulling wire 230 to adjust the radial size of the traction portion 210 , that is, to adjust the area of ​​the abutting surface 211 .

[0130] Please also read Figure 6 The pulling wire control device 70 includes a pulling wire fixing member 710 and a pulling wire driving member 720. The pulling wire driving member 720 is connected to the pulling wire fixing member 710. The pulling wire fixing member 710 is connected to the end of the pulling wire 230 away from the traction part 210. The pulling wire driving member 720 drives the pulling wire fixing member 710 to move axially, thereby tightening or loosening the pulling wire 230 to adjust the area of ​​the abutting surface 211.

[0131] See also Fig.26 In one embodiment, the pull wire fixing member 710 includes a pull wire fixing portion 711 and two engaging portions 712 respectively connected to both ends of the pull wire fixing portion 711. The pull wire fixing portion 711 is provided with an axially extending receiving hole 7111 and a fixing hole 7112 radially extending from the outer surface of the pull wire fixing portion 711 to the receiving hole 7111, and the receiving hole 7111 and the fixing hole 7112 are connected.

[0132] The pulling wire 230 passes through the receiving hole 7111 and the pulling wire fixing piece 710 . The fixing piece (not shown) extends into the fixing hole 7112 and into the receiving hole 7111 to press against the pulling wire 230 , thereby connecting the pulling wire 230 to the pulling wire fixing piece 710 .

[0133] A locking groove 7122 is defined at the end of the locking portion 712 .

[0134] See also Fig. 27In one embodiment, the wire driving member 720 includes a first wire driving portion 721 and a second wire driving portion 722, and the first wire driving portion 721 and the second wire driving portion 722 are detachably connected to form a sleeve structure. The wire driving member 720 is sleeved on the sleeve 340 and is rotatable relative to the sleeve 340. The rotation of the wire driving member 720 drives the wire fixing member 710 to move axially.

[0135] See also Fig.28 In one embodiment, a plurality of first strip grooves 7211 are provided on the inner wall of the first pulling wire driving portion 721, and a plurality of second strip grooves 7221 are provided on the inner wall of the second pulling wire driving portion 722. When the first pulling wire driving portion 721 and the second pulling wire driving portion 722 are connected, the first strip grooves 7211 and the second strip grooves 7221 form a spiral groove.

[0136] The pull wire fixing member 710 is accommodated in the accommodating cavity of the housing 310, and the two engaging portions 712 extend from the two windows of the housing 310 respectively, and further extend from the two strip-shaped holes on the other side of the protruding portion of the sleeve 340, so that the two ends of the pull wire fixing member 710 are embedded in the spiral groove. When the pull wire driving member 720 rotates relative to the sleeve 340, the pull wire fixing member 710 slides along the spiral groove to make the pull wire fixing member 710 move axially relative to the housing 310. When the sleeve 340 moves axially along the housing 310 as a whole, the pull wire fixing member 710 can also move axially relative to the housing 310.

[0137] Since a protrusion is formed in the middle of the sleeve 340 and blocks are formed on both sides of the sleeve 340, when the inner tube driver 520 and the wire pulling driver 720 are sleeved on the sleeve 340, the two ends of the inner tube driver 520 are blocked by the protrusion and one of the blocks and cannot be axially displaced, and the wire pulling driver 720 is blocked by the protrusion and the other block and cannot be axially displaced. In addition, the enclosure 350 is restricted by the inner tube driver 520 and the wire pulling driver 720 and cannot move axially. Therefore, the sleeve 340, the enclosure 350, the inner tube driver 520 and the wire pulling driver 720 form a whole, which can move axially along the housing 310.

[0138] Please also read Figure 3 and Figure 5Taking the traction of the atrial septum tissue as an example, during the operation, the traction member 20 is first accommodated in the inner tube 40, the puncture member 60 is located outside the inner tube 40, and the puncture member 60 and the inner tube 40 are both accommodated in the sheath tube 10. Under this positional relationship, the tissue traction device 1 is pushed to the atrial septum. Then, the sleeve 340 is slid distally along the housing 310 to push the puncture member 60, the traction member 20 and the inner tube 40 out of the sheath tube 10 as a whole. Keeping the traction member 20 accommodated in the inner tube 40 and the puncture member 60 located outside the inner tube 40, the sleeve 340 is continued to slide distally along the housing 310 to allow the puncture member 60, the traction member 20 and the inner tube 40 to pass through the atrial septum as a whole. Next, the inner tube driving member 520 is rotated to withdraw the inner tube 40 into the sheath tube 10. Furthermore, the pulling wire driving member 720 is rotated to make the pulling wire 230 retreat and shorten the distance between the distal end and the proximal end of the pulling member 20, thereby increasing the area of ​​the abutting surface 211. The sleeve 340 is slid proximally along the housing 310 to drive the pulling member 20 to retreat and abut against the atrial septal tissue, and then the sleeve 340 is continuously slid proximally, so that the pulling member 20 pulls the tissue into the sheath 10.

[0139] By reasonably connecting the inner tube fixing member 510 and the inner tube driving member 520 of the inner tube driving device 50 with the sleeve 340 in the manner described above, and reasonably connecting the pull wire fixing member 710 and the pull wire driving member 720 of the pull wire driving device 70 with the sleeve 340 in the manner described above, during the puncture process, when the sleeve 340 is moved axially along the housing 310, the relative position relationship of the puncture member 60, the traction member 20, the inner tube 40 and the pull wire 230 can be maintained, so that the puncture member 60, the traction member 20 and the inner tube 40 pass through the tissue as a whole. When the traction part 210 is located outside the inner tube 40, it will expand by itself and cannot pass through the tissue smoothly. In addition, before the traction part 210 passes through the tissue, the pull wire 230 cannot be tightened to avoid expanding the traction part 210 in advance. The reasonable arrangement of the inner tube driving device 50, the pull wire driving device 70 and the sleeve 340 is conducive to ensuring smooth puncture. Furthermore, the inner tube 40 can be retracted to release the traction member 20 and reserve a space for the traction member 20 and tissue by operating the inner tube driver 520 alone. The traction wire driver 720 can be moved to adjust the radial dimension of the traction portion 210 alone without causing undesirable linkage of other components.

[0140] It can be understood that in other embodiments, the length of the sleeve 340 can be shorter, and only the surrounding member 350 is sleeved on the sleeve 340, and the axial movement of the sleeve 340 only drives the axial movement of the traction member 20. The inner tube driving member 520 is sleeved on the housing 310. The axial movement or rotation of the inner tube driving member 520 drives the axial movement of the inner tube 40. The pulling wire driving member 720 is sleeved on the housing 310, and the axial movement or rotation of the pulling wire driving member 720 drives the axial movement of the pulling wire 230. This method can also achieve puncture and traction of tissues.

[0141] It should be noted that, in other embodiments, the sleeve 340 can be omitted, in which case the traction member control device 30, the inner tube control device 50 and the traction wire control device 70 act separately, or the inner tube control device 50 is pushed toward the proximal end to resist the traction member control device 30, so that the traction member control device 30 and the traction wire control device 70 are linked. The sleeve 340 can make the operation more stable and controllable.

[0142] It should also be noted that when the sleeve 340 is omitted, the limiting member 330 can be movably connected to the first shell 311, and the limiting sheet 331 and the limiting hole 3116 can be engaged or disengaged.

[0143] It should be further noted that, in other embodiments, the surrounding member 350 may be omitted. When the surrounding member 350 is omitted, the stopper 330 may be movably connected to the sleeve 340, and the stopper 331 extends into the sleeve 340 and can be engaged or disengaged with the stopper hole 3116. However, the surrounding member 350 can better contain the stopper 330, so as to prevent the stopper 331 from falling off or being damaged during transportation or collision.

[0144] By driving the inner tube fixing member 510 to move axially by the rotation of the inner tube driving member 520 and driving the pulling wire fixing member 710 to move axially by the pulling wire driving member 720, the length of the first gripping portion 3111 and the second gripping portion 3112 of the shell 310 can be reduced for easy transportation and operation.

[0145] Furthermore, the rotation of the pulling wire driving member 720 drives the pulling wire fixing member 710 to move axially, which is beneficial to controlling the moving speed of the pulling wire 230 and avoiding excessive tension of the pulling wire 230 to break the support rod 112 of the traction member 20 .

[0146] Please go back Figure 3The distal end of the connecting rod 220 extends into the traction portion 210, and a gap is formed between the distal end of the connecting rod 220 and the distal end of the traction portion 210, so that when the pulling wire 230 is tightened to a certain extent, the traction portion 210 abuts against the distal end of the connecting rod 220 and cannot continue to be pulled, which is beneficial to avoid excessive deformation of the traction portion 220 due to excessive tightening of the pulling wire 230, and thus helps to avoid breakage of the support rod 112.

[0147] A tissue traction device 1 according to an embodiment includes a sheath 10, a traction member 20 and a traction member control device 30. The traction member 20 includes a traction portion 210 and a connecting rod 220 connected to the traction portion 210. The traction member control device 30 includes a shell 310 and a traction member control assembly at least partially accommodated in the shell 310. The shell 310 is connected to the sheath 10. The traction member control assembly includes a traction member fixing member 320. The traction member fixing member 320 includes a traction member fixing component 321 and a traction member locking component 322. The connecting rod 220 passes through the traction member locking component 322. The traction member locking component 322 is connected to the traction member fixing component 321. The traction member fixing component 321 can move axially relative to the shell 310 so that the traction member 20 can move axially in the sheath 10.

[0148] A fastening hole 3221 is defined in the traction member locking component 322 , and the fastening hole 3221 axially extends from one end of the traction member locking component 322 to the other end.

[0149] A mounting hole 3224 is provided on the wall of the traction member locking component 322 , and the mounting hole 3224 is communicated with the fastening hole 3221 .

[0150] Along the axial direction, from the distal end to the proximal end, the mounting hole 3224 includes a first opening portion 3224A, a second opening portion 3224B and a third opening portion 3224C that are axially connected. The width of the second opening portion 3222B is greater than the widths of the first opening portion 3224A and the third opening portion 3224C, and the proximal end of the third opening portion 3224C is an open end.

[0151] In one embodiment, the material of the connecting rod 220 is a metal material, including but not limited to stainless steel, nickel-titanium alloy, etc. In one embodiment, the material of the connecting rod 220 is a polymer material.

[0152] The connecting rod 220 is a hollow slender rod. In one embodiment, the outer diameter of the connecting rod 220 is 0.5 to 1.0 mm. The connecting rod 220 has a relatively small rod diameter. By using the traction member fixing part 321 and the traction member locking part 322 to cooperate with each other to connect the connecting rod 220 with the traction member fixing part 321, damage to the connecting rod 220 and affecting its mechanical properties can be avoided, which is conducive to ensuring that the traction member 20 can reliably move axially in the sheath tube 10 to perform the traction operation.

[0153] It should be noted that the tissue traction instrument 1 of this embodiment may also include the inner tube 40, the inner tube control device 50, the pulling wire 230, the pulling wire control device 70, the sleeve 340, the surrounding piece 350, etc. mentioned above, which will not be repeated here.

[0154] A tissue traction device 1 according to an embodiment includes a sheath tube 10, a traction member 20, a traction member control device 30, and a pull wire control device 70. The traction member 20 includes a traction portion 210, a connecting rod 220, and a pull wire 230. The connecting rod 220 passes through the traction portion 210 and is connected to the traction portion 210. The pull wire 230 passes through the connecting rod 220, and the distal end of the pull wire 230 is connected to the traction portion 210. The traction member control device 30 is connected to the connecting rod 220, and is used to control the axial movement of the traction member 20 relative to the sheath tube 10. The pull wire control device 70 is connected to the pull wire 230, and is used to control the axial movement of the pull wire 230 relative to the connecting rod 220.

[0155] In one embodiment, a gap is formed between the distal end surface of the connecting rod 220 and the distal end of the pulling portion 210 .

[0156] It should be noted that the tissue traction instrument 1 of this embodiment may also include the inner tube 40, the inner tube control device 50, the sleeve 340, the surrounding piece 350, etc. mentioned above, which will not be described in detail here.

[0157] It should be noted that the tissue traction device 1 of each of the above-mentioned embodiments can be used together with a tissue cutting device to cut the tissue to form a hole after the tissue is pulled into the sheath 30. For example, an electric cutting device or a mechanical knife cutting device is used for cutting. The tissue cutting device can be independent or can be arranged in the tissue traction device 1. For example, the tissue cutting device includes a cutting part and a driving part connected to the cutting part, and the driving part is at least partially accommodated in the holding part of the shell 310. The driving part can move axially along the holding part and drive the cutting part to move axially along the sheath 10. When the tissue traction device 1 pulls the tissue into the sheath 10, the cutting part surrounds the tissue to be cut, and the driving part is operated to tighten the cutting part. At the same time, the cutting part is connected to the radio frequency power supply for electric cutting. The present disclosure protects the tissue traction device 1, and the tissue cutting device is not described in detail here.

[0158] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0159] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A tissue traction device, characterized in that: It includes a sheath, a traction member, a traction member control device and a pulling wire control device, the traction member includes a traction part, a connecting rod and a pulling wire, the connecting rod passes through the traction part and is connected to the traction part, the pulling wire passes through the connecting rod and the distal end of the pulling wire is connected to the traction part, the traction member control device is connected to the connecting rod and is used to control the axial movement of the traction member relative to the sheath, the pulling wire control device is connected to the pulling wire and is used to control the axial movement of the pulling wire relative to the connecting rod, and an end of the connecting rod away from the traction member control device forms a gap with the distal end of the traction part.

2. The tissue traction device according to claim 1, characterized in that: The traction member control device includes a traction member fixing member, and the traction member fixing member includes a traction member fixing member and a traction member locking member. The traction member fixing member is provided with a through hole, and the traction member locking member is provided with a fastening hole. One end of the connecting rod away from the traction part extends into the fastening hole and is connected with the traction member locking member. The traction member locking member is received and fixed in the through hole to connect the traction member with the traction member fixing member.

3. The tissue traction device according to claim 2, characterized in that: The through hole includes a first part, a second part and a third part which are arranged in sequence and connected, the aperture of the third part is larger than the aperture of the second part, the traction member locking component includes a first abutting portion and a second abutting portion connected to the first abutting portion, the outer diameter of the second abutting portion is larger than the outer diameter of the first abutting portion, the first abutting portion is accommodated in the second part, and the second abutting portion is accommodated in the third part, so that the end of the first abutting portion and the end of the second abutting portion both abut against the inner wall of the traction member fixing component.

4. The tissue traction device according to claim 3, characterized in that: The traction member locking component is provided with a mounting hole connected with the fastening hole, the connecting rod is sleeved with a reinforcing tube, the connecting rod passes through the fastening hole, the reinforcing tube is received in the mounting hole and abuts against the hole wall of the mounting hole.

5. The tissue traction device according to claim 3, characterized in that: The traction member control assembly also includes a shell and a sleeve. The traction member fixing component is partially accommodated in the shell. The sleeve is sleeved on the shell and can move axially along the shell. The traction member fixing part extends from the shell and is connected to the sleeve. The axial movement of the sleeve drives the axial movement of the traction member fixing part.

6. The tissue traction device according to claim 5, characterized in that: The shell is formed with a receiving cavity and a window communicating with the receiving cavity, the sleeve is formed with a clamping hole, the traction member fixing piece is accommodated in the receiving cavity, and the traction member fixing piece extends from the window and extends to the sleeve and is embedded in the clamping hole.

7. The tissue traction device according to claim 5, characterized in that: The traction member control assembly further includes a limiting member, which can pass through the sleeve and be movably connected to the shell to limit the axial movement of the sleeve along the shell.

8. The tissue traction device according to claim 7, characterized in that: The shell is provided with a limiting groove or a limiting hole, the sleeve is provided with a limiting window, and the limiting member comprises a limiting piece, which can pass through the limiting window and be detachably engaged with the limiting groove or the limiting hole.

9. The tissue traction device according to claim 1, characterized in that: The tissue traction instrument also includes an inner tube and an inner tube control device, wherein the inner tube control device is connected to the inner tube so that the inner tube can be axially movably accommodated in the sheath tube, the inner tube control device includes an inner tube fixing member and an inner tube driving member, the inner tube driving member is connected to the inner tube fixing member, the inner tube fixing member is connected to the inner tube, and the traction member control device allows the traction member to be axially movably accommodated in the inner tube.

10. The tissue traction device according to claim 9, characterized in that: A spiral groove is formed on the inner wall of the inner tube driving member, and the inner tube fixing member cooperates with the spiral groove so that the inner tube driving member drives the inner tube fixing member to move axially when the inner tube driving member rotates.

11. The tissue traction device according to claim 10, characterized in that: The traction member control assembly also includes a shell and a sleeve, the sleeve is sleeved on the shell and can move axially along the shell, the inner tube driving member is sleeved on the sleeve, the inner tube fixing member is accommodated in the shell, the inner tube fixing member extends from the shell and extends to the sleeve and extends from the sleeve, and is connected to the inner tube driving member.

12. The tissue traction device according to claim 1, characterized in that: The pulling wire control device comprises a pulling wire fixing part and a pulling wire driving part, wherein the pulling wire driving part is connected to the pulling wire fixing part, and the pulling wire fixing part is connected to the pulling wire.

13. The tissue traction device according to claim 12, characterized in that: The traction member control assembly also includes a shell and a sleeve, the sleeve is sleeved on the shell and can move axially along the shell, the traction wire driving member is sleeved on the sleeve, the traction wire fixing member is accommodated in the shell, the traction wire fixing member extends from the shell and extends to the sleeve and extends from the sleeve, and is connected to the traction wire driving member.

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