Sheath structure

Abstract

The present application provides a kind of sheath structure.The sheath structure includes: sheath, the proximal end of sheath is inserted into handle, bending mechanism is movably arranged on handle, bending mechanism is connected with sheath by traction wire and drives sheath to bend, multiple traction wires are spaced along the circumference of sheath, puller, multiple traction wires are connected with bending mechanism by multiple pullers respectively, reversing mechanism is arranged on handle, and it is used to connect puller in preset bending direction to bending mechanism.The present application solves the problem of poor bending flexibility of sheath structure in prior art.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a sheath structure. Background Technology

[0002] Interventional therapy has become an increasingly popular treatment option for common heart diseases such as valvular injury, atrial and ventricular septal defects, heart failure, and atrial fibrillation. Before an interventional procedure, a long sheath is usually inserted percutaneously into a blood vessel, such as the femoral artery or femoral vein. The sheath is then advanced along the vascular pathway to the site of the heart disease to form a protective channel through which procedures such as occlusion, repair, replacement, or ablation are performed.

[0003] Due to the complex anatomy of the heart, easy and successful targeting of lesions requires an adjustable distal end of the sheath, especially for ablation procedures with multiple and widely distributed targets. The greater the demand for distal sheath adjustability, the better, with a wider range of adjustable angles and directions. Most existing adjustable delivery sheaths are unidirectional or bidirectional (single-plane). If a unidirectional or bidirectional sheath is used, bending it to another direction during surgery is typically achieved by twisting the entire sheath. Due to the tortuous structure of the blood vessel, this twisting process causes friction against the vessel wall, potentially damaging it.

[0004] As can be seen from the above, the existing technology has the problem of poor flexibility in adjusting the bending of the sheath structure. Summary of the Invention

[0005] The main objective of this invention is to provide a sheath structure to solve the problem of poor bending flexibility in existing sheath structures.

[0006] To achieve the above objectives, the present invention provides a sheath structure, comprising: a sheath; a handle, the proximal end of which extends into the handle; a bending mechanism movably mounted on the handle, the bending mechanism being connected to the sheath via traction wires and driving the sheath to bend, wherein there are multiple traction wires spaced apart circumferentially along the sheath; multiple pulling members, wherein the multiple traction wires are respectively connected to the bending mechanism via the multiple pulling members; and a reversing mechanism mounted on the handle, used to connect the pulling members in a preset bending direction to the bending mechanism.

[0007] Furthermore, multiple traction wires are arranged in pairs relative to the sheath; and / or there are at least four traction wires.

[0008] Furthermore, the bending mechanism includes: a guide rail; a slider that passes through the guide rail; a drive block that is threadedly connected to the proximal end of the slider; and a drive knob that is sleeved on the drive block. The drive knob drives the drive block to rotate, thereby driving the slider to move axially along the guide rail.

[0009] Furthermore, the slider includes: a driving part having an external thread, a driving block being a sleeve structure having an internal thread, the external thread being adapted to the internal thread; and a first connecting part having a plurality of fixing grooves spaced apart circumferentially and extending axially to the distal end for connecting and fixing a plurality of pulling members respectively.

[0010] Furthermore, the slot of the fixing groove is provided with slots on both sides along the axial direction, and the slots have downward inclined surfaces.

[0011] Furthermore, the drive block has a plurality of first protrusions spaced apart in the circumferential direction, and the inner wall of the drive knob has a plurality of first grooves spaced apart in the circumferential direction. The first protrusions extend into the first grooves so that the drive knob and the drive block are stopped in the circumferential direction; or the drive block and the drive knob are integrally formed.

[0012] Furthermore, the guide rail has a through first hole for accommodating the sheath tube. The guide rail includes a proximal mounting portion, a first main body portion, and a distal mounting portion connected in sequence. The proximal mounting portion has a mounting block that engages with the housing of the handle. The first main body portion is a cylindrical structure and has a cut stop platform. A slider passes through the first main body portion and has a through second hole with a shape adapted to the first main body portion. The distal mounting portion is part of the first main body portion, and the stop platform extends to the distal mounting portion. The distal mounting portion is connected to the reversing mechanism.

[0013] Furthermore, the reversing mechanism includes: a reversing column having a through third hole for accommodating a sheath tube; the reversing column having multiple reversing slots spaced circumferentially and extending axially to the proximal end, the multiple reversing slots corresponding one-to-one with multiple traction wires; a reversing block having multiple reversing blocks movably disposed within the multiple reversing slots; a pulling member being detachably connected to the reversing block; and the traction wire passing through the reversing slot and the reversing block and connected to the pulling member; and a reversing knob sleeved on the reversing column, the inner wall of the reversing knob having a pressing member that presses the pulling member in the preset bending direction into the fixing groove of the slider of the bending mechanism to connect to the bending mechanism.

[0014] Furthermore, the commutation mechanism also includes multiple elastic reset members, which are respectively housed in multiple commutation slots. A boss is provided on the far end face of the commutation slot. The boss has a through hole for avoiding the traction wire. One end of the elastic reset member is sleeved on the boss, and the other end abuts against the commutation block.

[0015] Furthermore, the traction wire has a preset length, and the elastic reset member has an initial state and a compressed state. In the initial state, the proximal end of the commutator block is flush with the proximal end of the commutator column, and the pull member is connected to the commutator block.

[0016] Furthermore, the commutator has a notch that extends to the proximal end face of the commutator and is flared near the proximal end face of the commutator. The bottom surface of the notch includes a first inclined surface and a connecting surface connected in sequence. The first inclined surface slopes upward from the distal end face of the notch along the opening direction, and the connecting surface extends to the proximal end face of the notch along the opening direction of the notch. When the sheath structure is in the initial position, the puller is connected to the commutator and tilts upward under the support of the first inclined surface.

[0017] Furthermore, the bottom of the two side walls of the commutator block has a second protrusion, and the bottom of the two side walls of the commutator slot is provided with a second groove extending in the circumferential direction. The second protrusion extends into the second groove so that the commutator block and the commutator column are limited and stopped.

[0018] Furthermore, the proximal end of the reversing column has a mounting hole, and the distal end of the guide rail of the bending mechanism extends into the mounting hole to connect the bending mechanism with the reversing mechanism; and / or the distal end of the reversing block has a fourth through hole for avoiding the traction wire.

[0019] Furthermore, the pressure member is detachably connected to the reversing knob; or the pressure member and the reversing knob are integrally formed.

[0020] Furthermore, the inner wall of the reversing knob is provided with a positioning post, the end of the positioning post has a protrusion, the top of the pressing member has a positioning hole and a spring hole spaced apart, the spring hole accommodates a spring, the bottom of the positioning hole has a protrusion receiving groove, the diameter of the protrusion is larger than the diameter of the positioning hole, and the side wall of the positioning hole has a gap, the positioning post extends into the positioning hole through the deformation of the gap, so that the pressing member is connected to the reversing knob.

[0021] Furthermore, the pulling member includes a fixed part and a second connecting part connected in sequence. The fixed part has a receiving hole, and one end of the traction wire is received in the receiving hole. The second connecting part is connected to the bending mechanism.

[0022] Furthermore, the sheath structure also includes: a hemostatic valve, which is disposed inside the handle and connected to the proximal end of the sheath; and a nose tip, which is disposed at the distal end of the handle, through which the proximal end of the sheath extends into the handle.

[0023] Furthermore, the sheath structure also includes: a first mark, which is multiple, and the multiple first marks are arranged along the circumference of the handle and correspond one-to-one with multiple traction wires; and a second mark, which is arranged on the reversing mechanism and corresponds to the pressing part of the reversing knob of the reversing mechanism.

[0024] The technical solution of this invention includes a sheath structure comprising a sheath, a handle, a bending mechanism, a pulling member, and a reversing mechanism. The proximal end of the sheath extends into the handle. The bending mechanism is movably mounted on the handle and is connected to the sheath via traction wires, causing the sheath to bend. Multiple traction wires are spaced apart circumferentially along the sheath. Multiple pulling members are also present, with each traction wire connected to the bending mechanism via a different pulling member. The reversing mechanism is mounted on the handle and connects the pulling member in a preset bending direction to the bending mechanism. Thus, according to the preset bending direction to be adjusted during surgery, the reversing mechanism connects the pulling member in that preset bending direction to the bending mechanism. This allows the bending mechanism to connect the corresponding traction wire via the pulling member, thereby causing the sheath to bend in that preset bending direction. Multiple traction wires correspond to multiple different bending directions, enabling the sheath to bend flexibly and conveniently in various directions according to surgical needs. This greatly improves the bending flexibility of the sheath structure and solves the problem of poor bending flexibility in existing sheath structures. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 A schematic diagram of the sheath structure at one angle is shown in a specific embodiment of the present invention; and

[0027] Figure 2 A schematic diagram of the sheath structure from another angle is shown in a specific embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the commutator column in a specific embodiment of the present invention is shown;

[0029] Figure 4 A schematic diagram of the commutator block in a specific embodiment of the present invention is shown;

[0030] Figure 5 A cross-sectional view of a commutator block according to a specific embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram of the structure of the pull member in a specific embodiment of the present invention is shown;

[0032] Figure 7 A schematic diagram of the reversing mechanism in a specific embodiment of the present invention is shown;

[0033] Figure 8 A structural schematic diagram of a reversing knob at one angle is shown in a specific embodiment of the present invention;

[0034] Figure 9 A structural schematic diagram of the reversing knob at another angle is shown in a specific embodiment of the present invention;

[0035] Figure 10 for Figure 9 A magnified view of a section at point A in the middle;

[0036] Figure 11 A schematic diagram of the pressing component in a specific embodiment of the present invention is shown;

[0037] Figure 12 A schematic diagram of the guide rail structure in a specific embodiment of the present invention is shown;

[0038] Figure 13 A schematic diagram of the slider in a specific embodiment of the present invention is shown;

[0039] Figure 14 A schematic diagram of the structure of a driving block in a specific embodiment of the present invention is shown;

[0040] Figure 15 A schematic diagram of the drive knob in a specific embodiment of the present invention is shown;

[0041] Figure 16 A schematic diagram of the connection between the drive block and the drive knob is shown in a specific embodiment of the present invention.

[0042] The above figures include the following reference numerals:

[0043] 10. Sheath; 101. Traction wire; 20. Handle; 201. Front shell; 202. Rear shell; 30. Bending mechanism; 31. Guide rail; 310. Main body; 3111. Stop platform; 311. Proximal mounting part; 312. Distal mounting part; 313. First through hole; 32. Slider; 321. Drive part; 3210. External thread; 322. First connecting part; 3211. Fixing groove; 3212. Slot; 323. Second through hole; 33. Drive block; 3310. Internal thread; 3311. Mounting ring; 3312. First protrusion; 34. Drive knob; 3412. First groove; 40. Pulling element; 41. Fixing part; 411. Accommodating hole; 42. Second connecting part; 50. Reversing mechanism; 51. Reversing column; 510. Second main body; 5101. Third through hole; 5102. Reversing groove; 5103. Boss; 5104. Through hole; 5105. Second groove; 5106. Mounting hole; 511. Mounting part; 52. Reversing block; 521. Second protrusion; 522. Notch; 5221. First inclined surface; 5222. Second inclined surface; 5223. Fourth through hole; 53. Reversing knob; 531. Pressing member; 5310. Positioning hole; 5311. Spring hole; 5312. Protrusion receiving groove; 5313. Gap; 532. Positioning column; 5321. Protrusion; 533. Spring; 54. Elastic reset member; 60. Hemostatic valve; 70. Nose tip; 80. First mark; 90. Second mark. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0046] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0047] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0048] To address the problem of poor bending flexibility in existing sheath structures, this invention provides a sheath structure.

[0049] like Figures 1 to 2 As shown, the sheath structure includes a sheath 10, a handle 20, a bending mechanism 30, a pulling member 40, and a reversing mechanism 50. The proximal end of the sheath 10 extends into the handle 20. The handle 20 includes a housing, which includes a front housing 201 and a rear housing 202. The bending mechanism 30 is movably mounted on the handle 20. The bending mechanism 30 is connected to the sheath 10 via traction wires 101 and drives the sheath 10 to bend. There are multiple traction wires 101, which are spaced apart circumferentially along the sheath 10. There are multiple pulling members 40, and the multiple traction wires 101 are connected to the bending mechanism 30 via multiple pulling members 40. The reversing mechanism 50 is mounted on the handle 20 and is used to connect the pulling members 40 in a preset bending direction to the bending mechanism 30.

[0050] The sheath structure includes a sheath 10, a handle 20, a bending mechanism 30, a pulling member 40, and a reversing mechanism 50. The proximal end of the sheath 10 extends into the handle 20. The bending mechanism 30 is movably mounted on the handle 20 and is connected to the sheath 10 via traction wires 101, which bend the sheath 10. Multiple traction wires 101 are spaced apart circumferentially along the sheath 10. Multiple pulling members 40 are also present, with each traction wire 101 connected to the bending mechanism 30 via a separate pulling member 40. The reversing mechanism 50 is... Placed on the handle 20, it is used to connect the pull member 40 in the preset bending direction to the bending mechanism 30. In this way, according to the preset bending direction to be adjusted during the operation, the pull member in the preset bending direction is connected to the bending mechanism through the reversing mechanism. The bending mechanism connects the corresponding traction wire through the pull member, and then drives the sheath to bend in the preset bending direction through the traction wire. Multiple traction wires correspond to multiple different bending directions, so that the sheath can be flexibly and conveniently bent to various directions according to the needs of the operation, which greatly improves the bending flexibility of the sheath structure.

[0051] In this embodiment, there is an even number of traction wires 101, and multiple traction wires 101 are arranged in pairs opposite to the sheath 10. Further, there are at least four traction wires 101, such as six or eight, to meet the needs of more surgical bending directions. More specifically, multiple traction wires 101 are arranged at equal intervals along the circumference of the sheath 10, thereby making the adjustable bending directions of the sheath 10 more uniformly distributed and better meeting surgical needs.

[0052] like Figures 12 to 16As shown, the bending mechanism 30 includes a guide rail 31, a slider 32, a drive block 33, and a drive knob 34. The slider 32 is mounted on the guide rail 31. The drive block 33 is threadedly connected to the proximal end of the slider 32. The drive knob 34 is sleeved on the drive block 33, and the drive knob 34 drives the drive block 33 to rotate, thereby driving the slider 32 to move axially along the guide rail 31.

[0053] like Figure 12 As shown, the guide rail 31 has a through hole 313 for accommodating the sheath 10. The guide rail 31 includes a proximal mounting portion 311, a first main body portion 310, and a distal mounting portion 312 connected sequentially. The proximal mounting portion 311 has mounting blocks that engage with the rear housing 202. Specifically, the proximal mounting portion 311 includes at least two spaced mounting blocks for engaging within mounting grooves in the rear housing 202 to fix the guide rail 31. The first main body portion 310 is a cylindrical structure with a cut stop platform 3111, and a slider 32 passes through the first main body portion 310. That is, the cross-section of the first main body portion 310 is a circle with a portion of the arc cut off. Figure 13 As shown, the slider 32 has a through second hole 323, the shape of which is adapted to the first main body 310. Thus, because the first main body 310 has a stop platform 3111 that provides circumferential restraint to the slider 32, the slider 32 can only move axially along the guide rail 31 and cannot rotate circumferentially. The distal mounting portion 312 is part of the first main body 310, and the stop platform 3111 extends to the distal mounting portion 312. The distal mounting portion 312 is connected to the reversing mechanism 50, thereby connecting the bending mechanism 30 and the reversing mechanism 50 together.

[0054] like Figures 13 to 14 As shown, the slider 32 includes a driving part 321 and a first connecting part 322. The driving part 321 has an external thread 3210, and the driving block 33 is a sleeve structure with an internal thread 3310. The external thread 3210 and the internal thread 3310 are adapted to each other, so that the slider 32 is threadedly connected to the driving block 33 through the driving part 321. The first connecting part 322 has a plurality of fixing grooves 3211 that are spaced apart circumferentially and extend axially to the distal end, for connecting and fixing a plurality of pulling members 40 respectively.

[0055] like Figures 14 to 15As shown, the drive knob 34 is an annular structure, sleeved on the drive block 33. The drive block 33 has multiple circumferentially spaced first protrusions 3312, and the inner wall of the drive knob 34 has multiple circumferentially spaced first grooves 3412. The first protrusions 3312 extend into the first grooves 3412 and cooperate with each other to make the drive knob 34 and the drive block 33 circumferentially limit stop. Specifically, the first protrusions 3312 are located at the far end of the drive block 33. With the above arrangement, rotating the drive knob 34 can simultaneously drive the drive block 33 to rotate. Under the engagement of the thread and the limiting stop of the stop platform 3111, the slider 32 is converted into an axial driving force, thereby causing the slider 32 to move axially towards the proximal end, which in turn drives the pulling member 40 and the traction wire 101 to move towards the proximal end, thereby causing the sheath tube 10 to bend in the preset bending direction.

[0056] In an alternative embodiment, the drive block 33 is integrally formed with the drive knob 34.

[0057] like Figure 14 As shown, a mounting ring 3311 is also provided on the drive block 33. The mounting ring 3311 is located at the proximal end of the drive block 33 and is used to hold the drive block 33 in the mounting groove of the rear cover 202 to fix the drive block 33.

[0058] like Figures 3 to 5 , Figures 7 to 9 As shown, the reversing mechanism 50 includes a reversing column 51, reversing blocks 52, and a reversing knob 53. The reversing column 51 is located inside the front housing 201 and includes a second main body 510 and a mounting part 511 connected in sequence. The mounting part 511 is located at the distal end of the second main body 510 and has a square block structure, which is engaged in a slot on the front housing 201. The second main body 510 has a cylindrical structure with a through third through hole 5101 in the center for accommodating the sheath tube 10. The second main body 510 has a plurality of reversing slots 5102 that are spaced apart circumferentially and extend axially to the proximal end, and the plurality of reversing slots 5102 are corresponding one-to-one with a plurality of traction wires 101. There are a plurality of reversing blocks 52, and the plurality of reversing blocks 52 are movably disposed in the plurality of reversing slots 5102. The pull member 40 is detachably connected to the reversing block 52, and the traction wire 101 passes through the reversing groove 5102 and the reversing block 52 and is connected to the pull member 40. The reversing knob 53 is sleeved on the reversing column 51, and the inner wall of the reversing knob 53 has a pressing member 531. The pressing member 531 presses the pull member 40 in the preset bending direction into the fixing groove 3211 of the slider 32 of the bending mechanism 30, so as to connect to the bending mechanism 30.

[0059] like Figure 3As shown, the proximal end of the reversing column 51 has a mounting hole 5106. The distal mounting portion 312 extends into the mounting hole 5106 to connect the bending mechanism 30 with the reversing mechanism 50. Specifically, the shape of the mounting hole 5106 is adapted to the distal mounting portion 312, also being a circle with a portion of the arc removed, thus forming a circumferential stop between the bending mechanism 30 and the reversing mechanism 50.

[0060] like Figure 13 As shown, the slot 3211 has slots 3212 on both sides of the slot opening along the axial direction, and the slots 3212 have downward inclined surfaces. With the above configuration, when the pressing member 531 is rotated into the slot 3212, there will be a change in feel, indicating that the pulling member 40 and the slider 32 have been connected in place.

[0061] like Figure 7 As shown, the commutation mechanism also includes a resilient reset member 54. Multiple resilient reset members 54 are respectively housed within multiple commutation slots 5102. A boss 5103 is provided on the distal end face of each commutation slot 5102. The boss 5103 has a through hole 5104 for avoiding the traction wire 101; it is understood that the through hole 5104 penetrates the mounting portion 511. One end of the resilient reset member 54 is fitted onto the boss 5103, and the other end abuts against the commutation block 52.

[0062] In this embodiment, the elastic reset member 54 is a reset spring.

[0063] like Figures 4 to 5 As shown, the commutator block 52 has a notch 522 that extends to the proximal end face of the commutator block 52 and is flared near the proximal end face. The distal end of the commutator block 52 has a fourth through hole 5223 for avoiding the traction wire 101, and the fourth through hole 5223 communicates with the notch 522. The bottom surface of the notch 522 includes a first inclined surface 5221 and a connecting surface connected in sequence. The first inclined surface 5221 slopes upward from the distal end face of the notch 522 along the opening direction, and the connecting surface extends along the opening direction of the notch 522 to the proximal end face of the notch 522. Specifically, in this embodiment, the connecting surface is a second inclined surface 5222, which slopes downward along the opening direction of the notch 522. When the sheath structure is in its initial position, the pull member 40 is connected to the commutator block 52 and tilts upward under the support of the first inclined surface 5221.

[0064] like Figure 6As shown, the pulling member 40 includes a fixing part 41 and a second connecting part 42 connected in sequence. The fixing part 41 has a receiving hole 411, and one end of the traction wire 101 is received in the receiving hole 411. The second connecting part 42 is connected to the bending mechanism 30. In this embodiment, the shape of the pulling member 40 is adapted to the fixing groove 3211. Specifically, the fixing part 41 is an elongated cylindrical structure, and the second connecting part 42 is a block structure. The connection position of the fixing part 41 and the second connecting part 42 is located near the upper middle part of the end face of the second connecting part 42. When the sheath structure is in the initial position, the fixing part 41 is raised by the first inclined surface 5221.

[0065] like Figures 3 to 4 As shown, the bottom of the two side walls of the commutator block 52 has a second protrusion 521, and the bottom of the two side walls of the commutator groove 5102 is provided with a second groove 5105 extending in the circumferential direction. The second protrusion 521 extends into the second groove 5105 so that the commutator block 52 and the commutator column 51 are stopped in the circumferential direction, so that the commutator block 52 can only move axially within the commutator groove 5102.

[0066] In this embodiment, after the traction wire 101 enters the reversing groove 5102, it passes through the elastic reset member 54 and the fourth through hole 5223 of the reversing block 52, and then inserts into the receiving hole 411 of the fixing part 41 to connect with the pulling member 40. In order to make the traction wire 101 and the pulling member 40 securely connected, after the traction wire 101 is inserted into the fixing part 41, it can be fixed by welding, bonding or other methods, or by using external force to deform the fixing part 41 to clamp the traction wire 101.

[0067] Furthermore, the elastic reset member 54 has an initial state and a compressed state. Before connecting and fixing the traction wire 101 to the pull member 40, the traction wire 101 needs to be cut to a preset length so that when the elastic reset member 54 is in the initial state, the proximal end of the commutator block 52 is just flush with the proximal end of the commutator column 51, and the fixing part 41 of the pull member 40 is just located in the notch 522 of the commutator block 52 and abuts against the distal end face of the notch 522, thereby connecting with the commutator block 52. At this time, the traction wire 101 is just straight and basically unforced.

[0068] In this embodiment, the pressing member 531 is detachably connected to the reversing knob 53. For example... Figures 8 to 11As shown, the inner wall of the reversing knob 53 is provided with positioning posts 532, which have an arc-shaped structure. Specifically, there are two positioning posts 532 spaced apart. The end of the positioning post 532 has a protrusion 5321, and the top of the pressing member 531 has positioning holes 5310 and spring holes 5311 spaced apart. There are two positioning holes 5310, and the spring hole 5311 is located between the two positioning holes 5310. The spring hole 5311 accommodates a spring 533. The bottom of the positioning hole 5310 has a protrusion receiving groove 5312. The diameter of the protrusion 5321 is larger than the diameter of the positioning hole 5310, and the side wall of the positioning hole 5310 has a gap 5313. The positioning post 532 extends into the positioning hole 5310 through the deformation of the gap 5313, so that the pressing member 531 is connected to the reversing knob 53. After connection, the two ends of the spring 533 abut against the inner walls of the pressing member 531 and the reversing knob 53, respectively, and the protrusion 5321 is located in the protrusion receiving groove 5312, so that the pressing member 531 can move elastically along the axial direction of the positioning post 532 and will not fall off.

[0069] In an alternative embodiment, the pressure member 531 is integrally formed with the reversing knob 53.

[0070] In this embodiment, the outer surfaces of the drive knob 34 and the reversing knob 53 are both wavy, which provides good anti-slip properties and facilitates operation.

[0071] The specific bending process of the sheath structure in this embodiment is as follows:

[0072] Install the front shell 201 and rear shell 202 of the handle 20 and connect the reversing mechanism 50 and the bending mechanism 30. The reversing mechanism 50 is located at the distal end of the handle 20 and fixed inside the front shell 201, while the bending mechanism 30 is located at the proximal end of the handle 20 and fixed inside the rear shell 202. The reversing knob 53 and the drive knob 34 are exposed between the front shell 201 and the rear shell 202. The reversing knob 53 is sleeved on the reversing column 51 and encloses the pull member 40 therein. When the sheath structure is in the initial position, the sheath 10 is straight, the elastic reset member 54 on the reversing column 51 is in the initial state, each reversing block 52 is located on the proximal end face of the reversing column 51, each pull member 40 abuts against each reversing block 52, and tilts upward under the support of the first inclined surface 5221 of the reversing block 52. The slider 32 is located at the far end of the guide rail 31 and close to the reversing column 51. At this time, the fixing groove 3211 on each slider 32 is located directly below the pull member 40. Rotating the reversing knob 53 uses the pressing member 531 to press the pull member 40 in the preset bending direction into the fixing groove 3211. Then, rotating the drive knob 34 causes the slider 32 to move away from the reversing mechanism 50 with the pull member 40. The sheath tube 10 will bend in the preset bending direction under the tension of the traction wire 101. At the same time, the traction wire 101 in other directions, especially the back of the bending direction, will drive the reversing block 52 to slide towards the far end of the reversing groove 5102 due to the bending of the sheath tube 10. At this time, the elastic reset member 54 changes from the initial state to the compressed state.

[0073] When it is necessary to change the preset bending direction, first move the slider 32 to the initial position using the drive knob 34, and then rotate the reversing knob 53. When the pressing member 531 on the reversing knob 53 separates from the pulling member 40 pressed into the fixing groove 3211, the pulling member 40 will be lifted up under the tension of the traction wire 101, thus automatically separating from the fixing groove 3211. When the pulling member 40 in the other direction is pressed into the pulling member fixing groove 3211, the sheath tube 10 can be bent in the other direction.

[0074] When the reversing knob 53 is rotated, the pressing member 531 will be pressed tightly against the outer surface of the first connecting part 322 of the slider 32 under the elastic force of the spring 533. Since the upper end of the fixing groove 3211 is provided with a slot 3212, when the pressing member 531 is rotated into the slot 3212, there will be a change in feel, indicating that the pulling member 40 and the slider 32 have been connected in place.

[0075] In this embodiment, a shim is provided between the front shell 201, the reversing knob 53, the drive knob 34, and the rear shell 202 to eliminate gaps between the components and optimize the rotation feel of the knob.

[0076] like Figure 2As shown, the sheath structure also includes a hemostatic valve 60 and a nose tip 70. The hemostatic valve 60 is disposed within the handle 20 and connected to the proximal end of the sheath 10, thereby preventing axial movement and circumferential rotation of the sheath 10. The nose tip 70 is disposed at the distal end of the handle 20, through which the proximal end of the sheath 10 extends into the handle 20, and serves to prevent bending of the sheath 10.

[0077] like Figure 1 As shown, the sheath structure also includes a first mark 80 and a second mark 90. ​​There are multiple first marks 80, arranged circumferentially along the handle 20 and corresponding one-to-one with multiple traction wires 101. The second mark 90 is disposed on the reversing mechanism 50 and corresponds to the pressing member 531 of the reversing knob 53 of the reversing mechanism 50. During use, when the second mark 90 aligns with a certain first mark 80, rotating the drive knob 34 causes the sheath 10 to bend in that direction.

[0078] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: By setting the sheath structure to include a sheath 10, a handle 20, a bending mechanism 30, a pulling member 40, and a reversing mechanism 50, the proximal end of the sheath 10 extends into the handle 20, the bending mechanism 30 is movably mounted on the handle 20, the bending mechanism 30 is connected to the sheath 10 through a traction wire 101 and drives the sheath 10 to bend, there are multiple traction wires 101, the multiple traction wires 101 are arranged at intervals along the circumference of the sheath 10, there are multiple pulling members 40, the multiple traction wires 101 are respectively connected to the sheath 10 through the multiple pulling members 40, and the sheath 10 is bent. The bending mechanism 30 is connected, and the reversing mechanism 50 is set on the handle 20. It is used to connect the pull member 40 in the preset bending direction to the bending mechanism 30. In this way, according to the preset bending direction to be adjusted during the operation, the pull member in the preset bending direction is connected to the bending mechanism through the reversing mechanism. The bending mechanism connects the corresponding traction wire through the pull member and then drives the sheath to bend in the preset bending direction through the traction wire. Multiple traction wires correspond to multiple different bending directions, so that the sheath can be flexibly and conveniently bent to various directions according to the needs of the operation, which greatly improves the bending flexibility of the sheath structure.

[0079] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0080] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sheath structure, characterized in that, include: Sheath (10); Handle (20), the proximal end of the sheath (10) extends into the handle (20); A bending mechanism (30) is movably mounted on the handle (20). The bending mechanism (30) is connected to the sheath (10) via a traction wire (101) and drives the sheath (10) to bend. There are multiple traction wires (101), and the multiple traction wires (101) are spaced apart along the circumference of the sheath (10). Pulling member (40), there are multiple pulling members (40), and multiple traction wires (101) are respectively connected to the bending mechanism (30) through multiple pulling members (40); A reversing mechanism (50) is provided on the handle (20) for connecting the pulling member (40) in the preset bending direction to the bending mechanism (30). The reversing mechanism (50) includes: The reversing column (51) has a through third through hole (5101) for accommodating the sheath (10). The reversing column (51) has a plurality of reversing slots (5102) spaced apart circumferentially and extending axially to the proximal end. The plurality of reversing slots (5102) are arranged in a one-to-one correspondence with the plurality of traction wires (101). A reversing block (52), wherein there are multiple reversing blocks (52), and the multiple reversing blocks (52) are movably disposed in multiple reversing slots (5102), the pulling member (40) is detachably connected to the reversing block (52), and the traction wire (101) passes through the reversing slot (5102) and the reversing block (52) and is connected to the pulling member (40); A reversing knob (53) is sleeved on the reversing column (51). The inner wall of the reversing knob (53) has a pressing member (531). The pressing member (531) presses the pulling member (40) in the preset bending direction into the fixing groove (3211) of the slider (32) of the bending mechanism (30) to connect to the bending mechanism (30).

2. The sheath structure according to claim 1, characterized in that, The plurality of said traction wires (101) are arranged in pairs opposite to the sheath (10); and / or The traction wire (101) is at least four.

3. The sheath structure according to claim 1, characterized in that, The bending mechanism (30) includes: Guide rail (31); A slider (32) is mounted on the guide rail (31); A drive block (33) is threaded to the proximal end of the slider (32); A drive knob (34) is sleeved on the drive block (33). The drive knob (34) drives the drive block (33) to rotate, thereby driving the slider (32) to move axially along the guide rail (31).

4. The sheath structure according to claim 3, characterized in that, The slider (32) includes: The drive unit (321) has an external thread (3210), and the drive block (33) is a sleeve structure with an internal thread (3310), wherein the external thread (3210) is adapted to the internal thread (3310); The first connecting part (322) has a plurality of fixing grooves (3211) spaced apart circumferentially and extending axially to the distal end, for connecting and fixing the plurality of the pulling members (40) respectively.

5. The sheath structure according to claim 4, characterized in that, The slot (3211) has slots (3212) on both sides along the axial direction of the slot opening, and the slots (3212) have downward inclined surfaces.

6. The sheath structure according to claim 3, characterized in that, The drive block (33) has a plurality of first protrusions (3312) spaced apart circumferentially, and the inner wall of the drive knob (34) has a plurality of first grooves (3412) spaced apart circumferentially. The first protrusions (3312) extend into the first grooves (3412) so that the drive knob (34) and the drive block (33) are stopped in the circumferential direction; or The drive block (33) and the drive knob (34) are integrally formed.

7. The sheath structure according to claim 3, characterized in that, The guide rail (31) has a through first hole (313) for accommodating the sheath (10). The guide rail (31) includes a proximal mounting portion (311), a first main body portion (310), and a distal mounting portion (312) connected in sequence. The proximal mounting portion (311) has a mounting block that engages with the housing of the handle (20); The first main body (310) is a cylindrical structure and has a cutting stop platform (3111). The slider (32) is inserted through the first main body (310). The slider (32) has a through second hole (323). The shape of the second through hole (323) is adapted to the first main body (310). The remote mounting part (312) is part of the first main body part (310), the stop platform (3111) extends to the remote mounting part (312), and the remote mounting part (312) is connected to the reversing mechanism (50).

8. The sheath structure according to claim 1, characterized in that, The reversing mechanism further includes an elastic reset member (54), and there are multiple elastic reset members (54). The multiple elastic reset members (54) are respectively housed in multiple reversing grooves (5102). The far end face of the reversing groove (5102) is provided with a boss (5103). The boss (5103) has a through hole (5104) for avoiding the traction wire (101). One end of the elastic reset member (54) is sleeved on the boss (5103), and the other end abuts against the reversing block (52).

9. The sheath structure according to claim 8, characterized in that, The traction wire (101) has a preset length, and the elastic reset member (54) has an initial state and a compressed state. In the initial state, the proximal end of the commutator block (52) is flush with the proximal end of the commutator column (51), and the pull member (40) is connected to the commutator block (52).

10. The sheath structure according to claim 1, characterized in that, The reversing block (52) has a notch (522) that extends to the proximal end face of the reversing block (52) and is flared near the proximal end face of the reversing block (52). The bottom surface of the notch (522) includes a first inclined surface (5221) and a connecting surface connected in sequence. The first inclined surface (5221) slopes upward from the distal end face of the notch (522) along the opening direction. The connecting surface extends along the opening direction of the notch (522) to the proximal end face of the notch (522). When the sheath structure is in the initial position, the pulling member (40) is connected to the reversing block (52) and tilts upward under the support of the first inclined surface (5221).

11. The sheath structure according to claim 1, characterized in that, The bottom of the two side walls of the commutator block (52) has a second protrusion (521), and the bottom of the two side walls of the commutator groove (5102) is provided with a second groove (5105) extending in the circumferential direction. The second protrusion (521) extends into the second groove (5105) so that the commutator block (52) and the commutator column (51) are limited and stopped.

12. The sheath structure according to claim 1, characterized in that, The reversing column (51) has a mounting hole (5106) at its proximal end, and the distal mounting portion (312) of the guide rail (31) of the bending mechanism (30) extends into the mounting hole (5106) to connect the bending mechanism (30) with the reversing mechanism (50); and / or The distal end of the reversing block (52) has a fourth through hole (5223) for avoiding the traction wire (101).

13. The sheath structure according to claim 1, characterized in that, The pressing member (531) is detachably connected to the reversing knob (53); or The pressing component (531) is integrally formed with the reversing knob (53).

14. The sheath structure according to claim 13, characterized in that, The inner wall of the reversing knob (53) is provided with a positioning post (532). The end of the positioning post (532) has a protrusion (5321). The top of the pressing member (531) has a positioning hole (5310) and a spring hole (5311) spaced apart. The spring hole (5311) accommodates a spring (533). The bottom of the positioning hole (5310) has a protrusion receiving groove (5312). The diameter of the protrusion (5321) is larger than the diameter of the positioning hole (5310). The side wall of the positioning hole (5310) has a gap (5313). The positioning post (532) extends into the positioning hole (5310) through the deformation of the gap (5313) so that the pressing member (531) is connected to the reversing knob (53).

15. The sheath structure according to claim 1, characterized in that, The pulling member (40) includes a fixing part (41) and a second connecting part (42) connected in sequence. The fixing part (41) has a receiving hole (411). One end of the traction wire (101) is received in the receiving hole (411). The second connecting part (42) is connected to the bending mechanism (30).

16. The sheath structure according to any one of claims 1 to 15, characterized in that, The sheath structure also includes: A hemostatic valve (60) is disposed within the handle (20) and connected to the proximal end of the sheath (10); The nose tip (70) is located at the distal end of the handle (20), and the proximal end of the sheath (10) extends through the nose tip (70) into the handle (20).

17. The sheath structure according to any one of claims 1 to 15, characterized in that, The sheath structure also includes: The first mark (80) is multiple, and the multiple first marks (80) are arranged along the circumference of the handle (20) and correspond one-to-one with the multiple traction wires (101); The second mark (90) is set on the reversing mechanism (50) and corresponds to the pressing part (531) of the reversing knob (53) of the reversing mechanism (50).

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