Traction ring, sheath tube and interventional device

Abstract

The present invention discloses a traction ring, a sheath tube and an interventional device. The traction ring is used for connecting a traction wire. The traction ring includes a ring body, the ring body having a relative proximal ring surface and a distal ring surface, and two opposite peripheral walls located between the proximal ring surface and the distal ring surface. A first receiving groove is recessed in one of the peripheral walls of the ring body, and a receiving channel communicating with the first receiving groove is recessed in the proximal ring surface of the ring body. A hooking portion for hooking the traction wire is formed in the first receiving groove, and the traction wire placed in the first receiving groove is hooked on the hooking portion and then passes through the receiving channel. In the traction ring, the sheath tube and the interventional device of the present invention, after the traction wire is hooked on the hooking portion, a surface contact is formed with the hooking portion, ensuring reliability; at the same time, after the traction wire is placed in the first receiving groove, it is led out from the receiving channel on the ring body, so that at least part of the traction wire is accommodated in the ring body, effectively reducing the thickness of the overall structure and realizing a thin-wall design.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical devices, and particularly to a traction ring, a sheath tube and an interventional device. Background Art

[0002] Medical sheath tubes are used to establish channels, deliver or retrieve instruments, input drugs or drain body fluids during minimally invasive interventional diagnosis and treatment surgeries; among them, the adjustable bending sheath tube has a distal adjustable bending function and can quickly and reliably reach the target lesion location to reduce the surgery time. Before and during the surgery, doctors will perform repeated bending adjustment operations to precisely adjust the angle of the distal end of the tube body so that its bending angle adapts to the complex anatomical structures of different internal lumens in the human body. Therefore, this requires that the traction system of the adjustable bending sheath tube has good pulling fatigue performance. The tensile strength, tensile fatigue strength of the traction system and the influence on the wall thickness of the tube body are crucial in the adjustable bending sheath tube.

[0003] Referring to Figure 1 As shown, in the existing traction system, the traction wire 20' is folded in half and sleeved on the fixed ring 10'. When the traction wire 20' is subjected to a tensile force, the force acting on the fixed ring 10' is a "point" force, which easily causes the fixed ring to rupture or the folded part of the traction wire to break, lacking reliability. For this reason, on this basis, another connection method is proposed. Referring to Figure 2 As shown, the traction wire 20'' is connected by passing through the hole on the fixed ring 10''. Although this connection method has a certain reliability, the thickness of the overall structure is larger than the thickness of the fixed ring, which will cause an increase in the wall thickness of the sheath tube body. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a traction ring, a sheath tube and an interventional device that can ensure reliability and achieve a thin wall at the same time in view of the above defects in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] A traction ring is provided for connecting a traction wire, including a ring body having opposite proximal and distal ring surfaces and two opposite peripheral walls between the proximal and distal ring surfaces. A first receiving groove is recessed on one of the peripheral walls of the ring body, and a receiving channel communicating with the first receiving groove is recessed on the proximal ring surface of the ring body. A hooking portion for hooking the traction wire is formed in the first receiving groove, and the traction wire placed in the first receiving groove is hooked on the hooking portion and then passes through the receiving channel.

[0007] In one embodiment, the receiving channel is a second receiving groove penetrating through the other peripheral wall of the ring body, and a perforation communicating the first receiving groove and the second receiving groove is further provided on the ring body. The traction wire placed in the first receiving groove is hooked on the hooking portion and then enters the second receiving groove after passing through the perforation.

[0008] In one embodiment, the first receiving groove and the second receiving groove axially overlap to form the perforation through which the traction wire can pass.

[0009] In one embodiment, the second receiving groove is an arc-shaped groove formed by concave setting.

[0010] In one embodiment, the first receiving groove is partially provided on the peripheral wall of the ring body, and the hooking portion includes a convex block formed in the first receiving groove.

[0011] In one embodiment, the surface of the convex block where it is hooked by the traction wire is an arc surface.

[0012] In one embodiment, a recessed portion for limiting the traction wire hooked thereon is provided at the top of the convex block, and / or a blocking portion for limiting the traction wire hooked thereon is axially extended from a side surface of the convex block away from the bottom wall of the first receiving groove.

[0013] In one embodiment, one first receiving groove, one receiving channel and one convex block form a set of traction structures, and multiple sets of the traction structures are circumferentially spaced along the ring body.

[0014] In one embodiment, the first receiving groove is circumferentially provided on the outer peripheral wall of the ring body, so that the formed first receiving groove is an annular groove, and the annular wall of the annular groove forms the hooking portion.

[0015] In one embodiment, the surface at the intersection of the first receiving groove and the receiving channel in contact with the traction wire is an arc surface.

[0016] In one embodiment, the receiving channel includes a first sub-channel and a second sub-channel circumferentially spaced apart, and both the first sub-channel and the second sub-channel communicate with the first receiving groove; wherein,

[0017] When the receiving channel is a second receiving groove formed by penetrating through the other peripheral wall of the ring body, the first sub-channel and the second sub-channel are respectively a first sub-receiving groove and a second sub-receiving groove communicating with the first receiving groove; wherein,

[0018] When the first receiving groove and the second receiving groove axially overlap to form the perforation through which the traction wire can pass, the first sub-receiving groove and the second sub-receiving groove respectively axially overlap with the first receiving groove to form a first perforation and a second perforation through which the two ends of the traction wire can respectively pass; wherein,

[0019] When the second receiving groove is an arc-shaped groove formed by concave setting, the first sub-receiving groove and the second sub-receiving groove are respectively a first arc-shaped groove and a second arc-shaped groove formed by concave setting.

[0020] In one embodiment, when the hooking portion includes a convex block formed in the first receiving groove, the convex block is between the first sub-channel and the second sub-channel.

[0021] Another technical solution adopted by the present invention to solve its technical problems is:

[0022] Provide a sheath tube, including a tube body, a traction ring as described above provided on the tube body, and a traction wire. A traction channel communicating with the receiving channel of the traction ring is provided in the tube body, and the traction wire passing through the receiving channel enters the receiving channel.

[0023] Another technical solution adopted by the present invention to solve its technical problems is:

[0024] Provide an interventional device, characterized in that it includes the sheath tube as described above, a handle connected to the proximal end of the sheath tube, and a bending adjustment mechanism provided in the handle. The traction wire entering the receiving channel passes out of the traction channel and is connected to the bending adjustment mechanism.

[0025] In summary, in the traction ring, sheath tube and interventional device of the present invention, after the traction wire is hooked on the hooking portion, a surface contact is formed with the hooking portion, ensuring reliability; at the same time, after the traction wire is placed in the first receiving groove, it is led out from the receiving channel on the ring body, so that at least part of the traction wire is accommodated in the ring body, effectively reducing the thickness of the overall structure and realizing a thin-wall design. On the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube to deliver larger-sized devices; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube, and the sheath tube can be used in smaller blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0027] Figure 1 is a fixing method of the traction wire and the traction ring in the existing traction system;

[0028] Figure 2 is another fixing method of the traction wire and the traction ring in the existing traction system;

[0029] Figure 3 is a schematic diagram of the external structure of an exemplary traction ring of the present invention;

[0030] Figure 4 yes Figure 3 The internal structure diagram of the traction ring is shown;

[0031] Figure 5 It is the traction wire and Figure 3 The structural diagram of the traction ring connection shown;

[0032] Figure 6 yes Figure 3 A schematic top view of the traction ring shown;

[0033] Figure 7 yes Figure 3 A schematic diagram of a traction ring having perforations formed therein is shown;

[0034] Figure 8 The traction wire passes through Figure 3 A schematic diagram of the perforations on the traction ring is shown;

[0035] Figure 9 It includes Figure 3 A schematic structural diagram of the sheath tube of the traction ring shown;

[0036] Figure 10 is a schematic diagram of the external structure of another exemplary embodiment of a traction ring of the present invention;

[0037] Figure 11 yes Figure 10 The internal structure diagram of the traction ring is shown;

[0038] Figure 12 It includes Figure 10 Schematic diagram of the structure of the sheath tube of the traction ring shown. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] In addition, it should be noted that in the field of interventional medical devices, generally, the end of a medical device implanted in the human body or animal body or the delivery system for delivering the medical device that is closer to the operator is referred to as the "proximal end", and the end that is farther from the operator is referred to as the "distal end", and the "proximal end" and "distal end" of any component of the medical device or the delivery system are defined based on this principle. The "axial direction" generally refers to the length direction of the medical device when it is being delivered, and the "radial direction" generally refers to the direction perpendicular to its "axial direction", and the "axial direction" and "radial direction" of any component of the medical device are defined based on this principle.

[0043] Example 1

[0044] Refer to Figure 3 and Figure 10As shown in the figure, the exemplary embodiment of the present invention provides a towing ring 100 for connecting a towing wire 200. The towing ring 100 includes a ring body 10. The ring body 10 has opposite proximal ring surfaces 10a and distal ring surfaces 10b, and two opposite peripheral walls located between the proximal ring surface 10a and the distal ring surface 10b. A first receiving groove is recessed on one of the peripheral walls of the ring body 10, and a receiving channel communicating with the first receiving groove is recessed on the proximal ring surface 10a of the ring body 10. Here, the communication can refer to direct communication or indirect communication. A hooking portion for hooking the towing wire 200 is formed in the first receiving groove. After the towing wire 200 placed in the first receiving groove is hooked on the hooking portion, it passes through the receiving channel and exits. After the towing wire 200 is hooked on the hooking portion, it forms a surface contact with the hooking portion, ensuring reliability. At the same time, after the towing wire 200 is placed in the recessed first receiving groove and exits from the receiving channel on the ring body 10, at least part of the towing wire 200 is accommodated inside the ring body 10, effectively reducing the thickness of the overall structure and achieving a thin-wall design. It should be noted that the embodiment shown here, where the towing wire 200 placed in the first receiving groove is hooked on the hooking portion and then passes through the receiving channel and exits, is only an implementation manner for explaining the hooking process and should not limit the structure of the exemplary towing ring 100 of the present invention. For example, another way to achieve hooking is that an extended end of the towing wire 200 passes through the receiving channel, passes through the hooking portion in the first receiving groove, is hooked on the hooking portion, and then folds back and passes through the receiving channel. This process can still achieve hooking and passing through the receiving channel.

[0045] Furthermore, since setting a channel perforation in the axial direction of the ring body 10 has very high process requirements and great difficulty, and will result in relatively weak overall strength of the ring body 10 after setting the channel perforation. In view of this, in other embodiments, the receiving channel is a second receiving groove penetrating through the other peripheral wall of the ring body 10. A perforation communicating the first receiving groove and the second receiving groove is also provided in the radial thickness direction of the ring body 10. After the towing wire placed in the first receiving groove is hooked on the hooking portion, it passes through the perforation and enters the second receiving groove. In this embodiment, the receiving channel is set as a second receiving groove penetrating through the other peripheral wall of the ring body 10, and the first receiving groove and the second receiving groove are communicated through a radial perforation, so that the towing wire placed in the first receiving groove bends and passes through the perforation and then enters the second receiving groove. At least part of both sides of the towing wire is respectively placed in the first receiving groove and the second receiving groove, which is not only more conducive to achieving the thin-wall design of the ring body, but also ensures the overall strength of the towing ring provided with the receiving channel, and at the same time greatly reduces the process difficulty.

[0046] In other embodiments, as an implementation manner of implementing the above-mentioned perforation, the first receiving groove and the second receiving groove axially overlap to form a perforation through which the traction wire can pass. The perforation is arranged in this way. On the one hand, the process of setting the perforation is simplified. On the other hand, the depression depths of the first receiving groove and the second receiving groove overlap in the radial direction, so that more volume of the traction wire can be accommodated inside, thereby further realizing the thin-wall design.

[0047] Referring to Figure 4 As shown, preferably, since the second receiving groove is also recessed, in order to avoid the local strength of the ring body becoming weak due to the recessed second receiving groove and at the same time ensure that the second receiving groove has more accommodation volume, the second receiving groove is an arc-shaped groove formed by concave setting.

[0048] Exemplarily, the accommodation channel includes a first sub-channel and a second sub-channel arranged at circumferential intervals, and both the first sub-channel and the second sub-channel communicate with the first receiving groove; wherein, when the accommodation channel is a second receiving groove formed through the other circumferential wall of the ring body, the first sub-channel and the second sub-channel are respectively a first sub-receiving groove and a second sub-receiving groove communicating with the first receiving groove; wherein, when the first receiving groove and the second receiving groove axially overlap to form a perforation through which the traction wire can pass, the first sub-receiving groove and the second sub-receiving groove respectively axially overlap with the first receiving groove to form a first perforation and a second perforation through which the two ends of the traction wire can respectively pass; wherein, when the second receiving groove is an arc-shaped groove formed by concave setting, the first sub-receiving groove and the second sub-receiving groove are respectively a first arc-shaped groove and a second arc-shaped groove formed by concave setting.

[0049] Embodiment 2

[0050] Based on the traction ring 100 provided in the above Embodiment 1 of the present invention, an exemplary sheath tube is provided. The sheath tube includes a tube body, the traction ring 100 as described in Embodiment 1 provided on the tube body, and a traction wire 200. A traction channel communicating with the accommodation channel of the traction ring 100 is provided inside the tube body, and the traction wire 200 passing through the accommodation channel enters the accommodation channel. Selecting the traction ring 100 described in Embodiment 1 enables the present invention to achieve a larger inner diameter of the sheath tube on the premise of the same outer diameter of the sheath tube, so as to deliver larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube, and the sheath tube can be used in smaller blood vessels.

[0051] Embodiment 3

[0052] Based on the traction ring provided in the above-mentioned Embodiment 1 and the sheath tube provided in Embodiment 2, the present invention exemplarily provides an interventional device. The interventional device includes a sheath tube such as that in Embodiment 2, a handle connected to the proximal end of the sheath tube, and a bending adjustment mechanism disposed within the handle. The traction wire 200 that enters the accommodation channel passes out from the traction channel and is connected to the bending adjustment mechanism. The bending adjustment mechanism moves under the drive of an external force to pull and release the traction wire 200, thereby achieving the bending of the sheath tube.

[0053] Embodiment 4

[0054] Based on the traction ring 100 provided in the above-mentioned Embodiment 1, the present embodiment proposes a specific implementation manner of the traction ring 100. Specifically, as shown in Figure 3 In the figure, the first accommodation groove of the present embodiment is partially provided on the circumferential wall of the ring body 10 to form a partial first accommodation groove 21. The hooking portion includes a convex block 41 formed within the first accommodation groove. That is to say, the convex block 41 is formed within the partial first accommodation groove 21. An accommodation channel communicating with the partial first accommodation groove 21 is recessed on the proximal end annular surface 10a of the ring body 10. Here, "communicating" means directly communicating or indirectly communicating. The traction wire 200 placed within the partial first accommodation groove 21 is hooked on the hooking portion and then passes through the accommodation channel.

[0055] Among them, the ring body 10 has opposite first and second circumferential walls located between the proximal end annular surface 10a and the distal end annular surface 10b. When the first circumferential wall is the inner circumferential wall, the second circumferential wall is the outer circumferential wall; when the first circumferential wall is the outer circumferential wall, the second circumferential wall is the inner circumferential wall. It can be understood that in the present embodiment, for achieving the bending adjustment function, the partial first accommodation groove 21 can be provided on the first circumferential wall or the second circumferential wall of the ring body 10, that is, the partial first accommodation groove 21 can be provided on the inner circumferential wall or can also be provided on the outer circumferential wall, and can be specifically selected according to needs. In the present embodiment, for the convenience of grooving and the setting of the hooking portion, as shown in Figure 3 In the figure, the partial first accommodation groove 21 is provided on the outer circumferential wall of the ring body 10. It should also be understood that the distal end of the partial first accommodation groove 21 can penetrate the distal end annular surface 10b of the ring body 10 or can also not penetrate the distal end annular surface 10b of the ring body 10, as long as the traction wire 200 can be placed within the partial first accommodation groove 21 and hooked on the convex block 41.

[0056] Continuing to refer to Figure 3 In the figure, in order to better adapt to the compliant form of the traction wire 200 and fit it, and increase the force-bearing area, the surface of the convex block 41 where it is hooked with the traction wire 200 is an arc surface, that is, Figure 3 as shown in the figure, the top of the convex block 41 is arc-shaped. Compared with the contact method of the relative edges and corners, the arc-shaped contact surface can more effectively reduce wear, reduce the risk of failure of the traction wire and the fixing ring, and make the connection between the traction wire and the fixing ring more reliable.

[0057] Further, in order to prevent the traction wire 200 hooked on the bump 41 from detaching from the bump 41, as an anti-detachment implementation method, a recessed portion 41a for limiting the traction wire 200 hooked thereon is provided at the top of the bump 41. As another anti-detachment implementation method, a blocking portion 41b for limiting the traction wire 200 hooked thereon axially extends from a side surface of the bump 41 away from the bottom wall of the first receiving groove. Additionally, in other embodiments, the above two anti-detachment methods can be combined, that is, both the recessed portion 41a and the blocking portion 41b are provided. The recessed portion 41a and the blocking portion 41b both perform radial limiting on the traction wire hooked on the bump 41, preventing its detachment failure and ensuring the reliability of the hooking.

[0058] As an implementation method of the receiving channel in this embodiment, the receiving channel is a through hole recessed from the proximal end annular surface 10a of the annular body 10 and formed inside the annular body 10. This through hole communicates with the local first receiving groove 21. Here, the communication can refer to direct communication or indirect communication. The traction wire 200 placed in the local first receiving groove 21 passes through the through hole after being hooked on the hooking portion. Note that the through hole formed inside the annular body 10 means that the through hole does not penetrate any circumferential wall of the annular body 10.

[0059] As another implementation method of the receiving channel in this embodiment, the receiving channel is a second receiving groove recessed from the proximal end annular surface 10a of the annular body 10 and formed on the annular body 10. This second receiving groove penetrates through another circumferential wall of the annular body 10. It should be noted that the circumferential wall penetrated by this second receiving groove is the other circumferential wall opposite to the circumferential wall provided with the local first receiving groove 21. That is to say, when the local first receiving groove 21 is provided on the first circumferential wall, this second receiving groove penetrates through the second circumferential wall; when the local first receiving groove 21 is provided on the second circumferential wall, this second receiving groove penetrates through the first circumferential wall. That is, the local first receiving groove 21 and this second receiving groove are opposite in the thickness direction of the annular body 10. Among them, the way that this second receiving groove penetrates through another circumferential wall of the annular body 10 is not only more conducive to the setting of the receiving channel, the manufacturing process is simpler and easier to implement, but also has lower requirements for the wall thickness of the annular body 10, which is more conducive to the setting of thin walls.

[0060] Further, in combination with Figures 3 to 5 shown, the receiving channel includes a first sub-channel 31a and a second sub-channel 31b that are circumferentially spaced apart. Both the first sub-channel 31a and the second sub-channel 31b communicate with the local first receiving groove 21. After the traction wire 200 placed in the local first receiving groove 21 is hooked on the hooking portion, its two extending ends respectively pass out from the first sub-channel 31a and the second sub-channel 31b. The two extending segments of the traction wire 2 are independent, avoiding the product failure problem caused by the mutual entanglement and wear between the traction wires 200 passing through one receiving channel. Preferably, as Figure 3As shown, in other embodiments, when the hooking portion is a bump 41 formed in the first receiving groove, the bump 41 is located between the first sub-channel 31a and the second sub-channel 31b, so that the traction wire is more evenly stressed and the pulling is more stable.

[0061] Among them, based on the above-mentioned arrangement of the receiving channel, when the receiving channel is a through hole formed by concavely arranging in the annular body 10 from the proximal annular surface 10a of the annular body 10, the first sub-channel 31a and the second sub-channel 31b can be the first through hole and the second through hole formed by concavely arranging in the annular body 10 from the proximal annular surface 10a of the annular body 10, and both the first through hole and the second through hole communicate with the local first receiving groove 21. Then, after the traction wire 200 placed in the local first receiving groove 21 is hooked on the hooking portion, its two extending ends respectively pass out from the first through hole and the second through hole.

[0062] When the receiving channel is a second receiving groove formed by concavely arranging on the annular body 10 from the proximal annular surface 10a of the annular body 10, the first sub-channel 31a and the second sub-channel 31b are respectively the first sub-receiving groove and the second sub-receiving groove formed by concavely arranging on the annular body 10 from the proximal annular surface 10a of the annular body 10, and both the first sub-receiving groove and the second sub-receiving groove penetrate through the other peripheral wall of the annular body 10. It should also be noted that the peripheral wall penetrated by both the first sub-receiving groove and the second sub-receiving groove is the other peripheral wall opposite to the peripheral wall provided with the local first receiving groove 21, that is to say, when the local first receiving groove 21 is provided on the first peripheral wall, both the first sub-receiving groove and the second sub-receiving groove penetrate through the second peripheral wall; when the local first receiving groove 21 is provided on the second peripheral wall, both the first sub-receiving groove and the second sub-receiving groove penetrate through the first peripheral wall. That is, the local first receiving groove 21 is opposite to the first sub-receiving groove and the second sub-receiving groove in the thickness direction of the annular body 10. After the traction wire 200 placed in the local first receiving groove 21 is hooked on the hooking portion, its two extending ends are respectively led out from the first sub-receiving groove and the second sub-receiving groove.

[0063] Preferably, in other embodiments, as shown in Figure 3 、 Figure 4 and Figure 6 When the first sub-channel 31a and the second sub-channel 31b are respectively the first sub-receiving groove and the second sub-receiving groove formed by concavely arranging on the annular body 10 from the proximal annular surface 10a of the annular body 10, the first sub-receiving groove and the second sub-receiving groove are respectively the first arc-shaped groove and the second arc-shaped groove penetrating through the other peripheral wall of the annular body 10, as shown in Figure 3 、 Figure 4 and Figure 6As shown, both the first arc-shaped groove and the second arc-shaped groove axially overlap with the first receiving groove to form a first through hole a and a second through hole b through which the traction wire 200 can pass. In this embodiment, the arc-shaped grooves are provided on the annular ring body 10. On the one hand, it can make the columnar traction wire 200 be placed in the ring body 10 as much as possible, which is beneficial for the thin-wall setting; on the other hand, it can avoid the local part of the annular ring body 10 becoming too thin due to the setting of non-arc-shaped grooves, affecting the strength of the ring body 10. That is to say, the setting method of this embodiment can achieve the thin-wall setting while effectively ensuring the overall strength and the reliability of the connection.

[0064] Referring Figure 6 and Figure 7 As shown, the axial length of the first through hole a and the second through hole b formed by the axial overlap of the first arc-shaped groove and the second arc-shaped groove with the first receiving groove is W2, and the circumferential overlap length is W1. It can be understood that the through hole can allow the traction wire 200 to pass through, and the minimum value of the axial length W2 and the circumferential length W1 is equal to or slightly larger than the diameter of the traction wire 200, so that the traction wire can pass through the first through hole a and the second through hole b.

[0065] Exemplarily, as Figure 3 and Figure 4 As shown, a local first receiving groove 21 is provided on the outer peripheral wall of the ring body 10 to form a local outer first receiving groove. Both the first sub-receiving groove and the second sub-receiving groove are inner grooves penetrating the inner peripheral wall of the ring body 10, so the arc-shaped groove is an arc-shaped inner groove. The two arc-shaped inner grooves respectively form the first through hole a and the second through hole b with the local outer first receiving groove. The convex block 41 is located in the local outer first receiving groove, and the two arc-shaped inner grooves are on both sides of the convex block 41. The formed first through hole a and the second through hole b are also on both sides of the convex block 41, so that a W-shaped groove is formed in the local outer first receiving groove. Referring Figure 8 As shown, the traction wire 200 placed in the W-shaped groove is hooked on the hooking part along the path S1, and the extended end passes through the through hole along the path S2 and then continues to enter the receiving channel along the path S3. There is a radial transition during the process of the traction wire passing through the through hole along the path S2, which enables the wall thickness of the ring body 10 to be made smaller. Compared with the existing solution, on the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube to deliver larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube, and the sheath tube can be used in smaller blood vessels. By adopting the solution of this embodiment, the diameter of the traction wire can be made equal to the thickness of the traction ring.

[0066] Among them, a partial first receiving groove 21, a receiving channel, and a bump 41 in the above-described embodiment form a set of traction structures. In order to achieve bending adjustment in different directions, in other embodiments, multiple sets of traction structures are arranged at intervals along the circumferential direction of the annular body 10. Herein, the multiple sets refer to two sets or more than two sets. Exemplarily, two sets of traction structures are provided, and the two sets of traction structures are radially opposite to each other, so that two-way bending adjustment can be achieved.

[0067] Furthermore, since the traction ring is usually fixed to the distal end of the sheath tube, in order to enhance the connection strength between the traction ring and the distal end of the sheath tube and prevent the annular traction ring from rotating circumferentially relative to the sheath tube, refer to Figure 3 As shown, a connecting groove 50 is further recessed on the outer peripheral wall of the traction ring. The connecting groove 50 axially penetrates through the proximal annular surface 10a and the distal annular surface 10b of the annular body 10. Preferably, a plurality of connecting grooves 50 are arranged at intervals along the circumferential direction of the annular body 10.

[0068] It should be noted that the specific implementation manner of a traction ring 100 exemplified in Embodiment 4 cannot be limited to only one solution. There can be multiple different solutions for its different structures. As described above, the selection and combination of its specific solutions can be set according to the actual situation.

[0069] Embodiment 5

[0070] Refer to Figure 9 , on the basis of the traction ring 100 provided in the above Embodiment 4 of the present invention, an exemplary sheath tube A is provided. The sheath tube A includes a tube body 300, the traction ring 100 as described in Embodiment 4 provided on the tube body 300, and a traction wire 200. A traction channel communicating with the receiving channel of the traction ring 100 is provided in the tube body 300, and the traction wire 200 passing through the receiving channel enters the receiving channel. By selecting the traction ring 100 described in Embodiment 4, on the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube and transport larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube, and the sheath tube can be used in smaller blood vessels.

[0071] Embodiment 6

[0072] On the basis of the traction ring 100 provided in the above Embodiment 4 and the sheath tube A provided in Embodiment 5 of the present invention, an exemplary interventional instrument is provided. An interventional instrument includes the sheath tube A as described in Embodiment 5, a handle connected to the proximal end of the sheath tube A, and a bending adjustment mechanism provided in the handle. The traction wire 200 entering the receiving channel passes out of the traction channel and is connected to the bending adjustment mechanism. The bending adjustment mechanism moves under the drive of an external force to pull and release the traction wire 200, thereby achieving the bending of the sheath tube.

[0073] Embodiment 7

[0074] This embodiment provides another specific implementation of the traction ring 100 based on the traction ring 100 provided in the above embodiment 1. Figure 10 As shown, the first receiving groove of this embodiment is circumferentially arranged on the outer peripheral wall of the ring body 10, so that the formed first receiving groove is an annular groove 22, and the annular wall 42 of the annular groove 22 forms a hook portion. In other words, the hook portion is formed by the ring body 10 itself, and the receiving channel recessed on the proximal annular surface 10a of the ring body 10 is connected to the annular groove 22, and the connection here refers to direct or indirect connection. After the traction wire 20 wraps around the annular groove 22 of the ring body 10 for a circle, it is hooked on the hook portion and then passes through the receiving channel. The traction wire wraps around the annular groove 22 on the outer side of the traction ring for a circle, and when subjected to force, the force points are distributed at various points around the traction ring, reducing the risk of failure of the traction wire and the traction ring, and making the connection between the traction wire and the traction ring more reliable.

[0075] Continue to refer to Figure 3 As shown, to better accommodate the compliant shape of the traction wire 200 and increase the force-bearing area, the surface at the intersection of the first receiving groove and the receiving channel that contacts the traction wire 200 is curved. Specifically, the 90° bend of the traction wire is curved. Compared to angular contact, the arc-shaped contact surface can more effectively reduce wear and tear, lowering the risk of failure between the traction wire and the retaining ring, and ensuring a more reliable connection between the traction wire and the retaining ring.

[0076] As one implementation of the accommodating channel in this embodiment, the accommodating channel is a through hole formed in the ring body 10 from the proximal annular surface 10a of the ring body 10. The through hole is connected to the annular groove 22. The term "connected" here refers to direct or indirect communication. The traction wire 200 placed in the annular groove 22 is hooked on the ring body 10 and then passes through the through hole. Note that the through hole formed in the ring body 10 here means that the through hole does not penetrate any peripheral wall of the ring body 10.

[0077] As another embodiment of the accommodating channel in this embodiment, the accommodating channel is a second accommodating groove formed on the ring body 10 from the proximal annular surface 10a of the ring body 10, and the second accommodating groove penetrates the inner circumferential wall of the ring body 10. The arrangement of the second accommodating groove penetrating the inner circumferential wall of the ring body 10 not only facilitates the provision of the accommodating channel, but also simplifies the manufacturing process and makes it easier to implement. It also has lower requirements on the wall thickness of the ring body 10, making it more conducive to the provision of thin walls.

[0078] Further, combined with Figure 10 and Figure 12As shown, the accommodation channel includes a first sub-channel 31a and a second sub-channel 31b that are circumferentially spaced apart. Both the first sub-channel 31a and the second sub-channel 31b communicate with the annular groove 22. Here, "communicate" means direct communication or indirect communication. After the traction wire 200 placed in the annular groove 22 is hooked on the ring body 10, its two extending ends respectively pass out from the first sub-channel 31a and the second sub-channel 31b. The two extending segments of the traction wire 200 are independent, avoiding the problem of product failure caused by the mutual entanglement and wear between the traction wires 200 passing through one accommodation channel.

[0079] Among them, based on the setting of the aforementioned accommodation channel in this embodiment, when the accommodation channel is a through hole formed by recessing from the proximal annular surface 10a of the ring body 10 within the ring body 10, the first sub-channel 31a and the second sub-channel 31b can be the first through hole and the second through hole formed by recessing from the proximal annular surface 10a of the ring body 10 within the ring body 10. Both the first through hole and the second through hole communicate with the annular groove 22. Here, "communicate" means direct communication or indirect communication. Then, after the traction wire 200 placed in the local first accommodation groove is hooked on the ring body 10, its two extending ends respectively pass out from the first through hole and the second through hole.

[0080] When the accommodation channel is a second accommodation groove formed by recessing from the proximal annular surface 10a of the ring body 10 on the ring body 10, the first sub-channel 31a and the second sub-channel 31b are respectively the first sub-accommodation groove and the second sub-accommodation groove formed by recessing from the proximal annular surface 10a of the ring body 10 on the ring body 10. Both the first sub-accommodation groove and the second sub-accommodation groove penetrate the inner peripheral wall of the ring body 10. That is, the annular groove 22 is opposite to the first sub-accommodation groove and the second sub-accommodation groove in the thickness direction of the ring body 10. After the traction wire 200 placed in the annular groove 22 is hooked on the ring body 10, its two extending ends are respectively led out from the first sub-accommodation groove and the second sub-accommodation groove.

[0081] Furthermore, since the traction ring is usually fixed to the distal end of the sheath tube, in order to enhance the connection strength between the traction ring and the distal end of the sheath tube and prevent the annular traction ring from rotating circumferentially relative to the sheath tube, a connection groove (not shown) is also recessed on the outer peripheral wall of the traction ring. The connection groove axially penetrates the proximal annular surface 10a and the distal annular surface 10b of the ring body 10. Preferably, a plurality of connection grooves are circumferentially spaced apart along the ring body 10.

[0082] It should be noted that the specific implementation manner of a traction ring 100 exemplified in Embodiment 7 cannot be limited to only one scheme. There can be multiple different schemes for its different structures. As described above, the selection and combination of its specific schemes can be set according to the actual situation.

[0083] Embodiment 8

[0084] Refer to Figure 12, based on the traction ring 100 provided in the above-mentioned Embodiment 7, the present invention exemplarily provides a sheath tube A. The sheath tube A includes a tube body 300, the traction ring 100 as described in Embodiment 7 provided on the tube body 300, and a traction wire 200. A traction channel communicating with the accommodation channel of the traction ring 100 is provided inside the tube body 300, and the traction wire 200 passing through the accommodation channel enters the accommodation channel. By selecting the traction ring 100 described in Embodiment 7, on the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube to deliver larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube, and the sheath tube can be used in smaller blood vessels.

[0085] Embodiment 9

[0086] Based on the traction ring 100 provided in the above-mentioned Embodiment 7 and the sheath tube A provided in Embodiment 8, the present invention exemplarily provides an interventional instrument. An interventional instrument includes the sheath tube A as described in Embodiment 8, a handle connected to the proximal end of the sheath tube A, and a bending adjustment mechanism provided inside the handle. The traction wire 200 entering the accommodation channel passes out of the traction channel and is connected to the bending adjustment mechanism. The bending adjustment mechanism moves under the drive of an external force to pull and release the traction wire 200, thereby realizing the bending of the sheath tube.

[0087] In the traction ring, sheath tube and interventional instrument of the present invention, after the traction wire is hooked on the hooking portion, a surface contact is formed with the hooking portion, ensuring reliability; at the same time, after the traction wire is placed in the first accommodation groove and led out from the accommodation channel on the ring body, at least part of the traction wire is accommodated inside the ring body, effectively reducing the thickness of the overall structure and realizing a thin-wall design. On the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube to deliver larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube, and the sheath tube can be used in smaller blood vessels.

[0088] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.

[0089] The above-mentioned embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A traction ring for connecting a traction wire, characterized in that, Comprising an annular body, the annular body having opposite proximal annular surfaces and distal annular surfaces, and two opposite peripheral walls located between the proximal annular surface and the distal annular surface, a first receiving groove being recessed in one of the peripheral walls of the annular body, a receiving channel being recessed in the proximal annular surface of the annular body and communicating with the first receiving groove, a hooking portion for hooking the traction wire being formed in the first receiving groove, and the traction wire placed in the first receiving groove being hooked on the hooking portion and then passing through the receiving channel; the receiving channel is a second receiving groove penetrating through the other peripheral wall of the annular body, and a perforation communicating the first receiving groove and the second receiving groove is further provided on the annular body, and the traction wire placed in the first receiving groove is hooked on the hooking portion and then enters the second receiving groove after passing through the perforation, and the first receiving groove and the second receiving groove axially overlap to form the perforation through which the traction wire can pass; wherein, the first receiving groove is partially provided on the peripheral wall of the annular body, and the hooking portion includes a bump formed in the first receiving groove; or, the first receiving groove is circumferentially provided on the outer peripheral wall of the annular body, so that the formed first receiving groove is an annular groove, and the annular wall of the annular groove forms the hooking portion.

2. The towing ring according to claim 1, wherein The second receiving groove is an arc-shaped groove recessed and formed.

3. The towing ring according to claim 1, characterized in that, When the hooking portion includes a bump formed in the first receiving groove, the surface of the bump at the hooking place with the traction wire is an arc surface.

4. The towing ring according to claim 1, characterized in that, When the hooking portion includes a bump formed in the first receiving groove, a recessed portion for limiting the traction wire hooked thereon is provided at the top of the bump, and / or, a blocking portion for limiting the traction wire hooked thereon is axially extended from a side surface of the bump away from the bottom wall of the first receiving groove.

5. The towing ring according to claim 1, characterized in that, One first receiving groove, one receiving channel and one bump form a set of traction structures, and multiple sets of the traction structures are circumferentially spaced along the annular body.

6. The towing ring according to claim 1, wherein When the first receiving groove is the annular groove, the surface at the intersection of the first receiving groove and the receiving channel in contact with the traction wire is an arc surface.

7. The towing ring according to claim 1, wherein The receiving channel includes a first sub-channel and a second sub-channel circumferentially spaced, and both the first sub-channel and the second sub-channel communicate with the first receiving groove; wherein, the first sub-channel and the second sub-channel are respectively a first sub-receiving groove and a second sub-receiving groove communicating with the first receiving groove, and the first sub-receiving groove and the second sub-receiving groove respectively axially overlap with the first receiving groove to form a first perforation and a second perforation through which the two ends of the traction wire can respectively pass.

8. The towing ring according to claim 2, characterized in that, The receiving channel includes a first sub-channel and a second sub-channel circumferentially spaced, and both the first sub-channel and the second sub-channel communicate with the first receiving groove; wherein, the first sub-channel and the second sub-channel are respectively a first sub-receiving groove and a second sub-receiving groove communicating with the first receiving groove, and the first sub-receiving groove and the second sub-receiving groove are respectively arc-shaped grooves recessed and formed.

9. The towing ring according to claim 7 or 8, characterized in that, When the hooking part includes a bump formed in the first accommodation groove, the bump is between the first sub-channel and the second sub-channel.

10. A sheath tube, characterized in that, It includes a tube body, a traction ring as described in any one of claims 1 to 9 provided on the tube body, and a traction wire. A traction channel communicating with the accommodation channel of the traction ring is provided in the tube body, and the traction wire passing through the accommodation channel enters the accommodation channel.

11. An interventional device, characterized in that, It includes a sheath tube as described in claim 10, a handle connected to the proximal end of the sheath tube, and a bending adjustment mechanism provided in the handle. The traction wire entering the accommodation channel is connected to the bending adjustment mechanism after passing out of the traction channel.

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