Tracheal stent delivery device and tracheal stent system

Abstract

The present invention provides a tracheal stent conveyor and a tracheal stent system. The tracheal stent conveyor includes a binding unit and a supporting unit. The binding unit includes a wire binding tube and a binding wire, the binding wire is inserted into the wire binding tube and the distal end of the binding wire is fixed relative to the distal end of the wire binding tube, and the distal end of the wire binding tube is provided with a plurality of side holes, and in a first state, the binding wire extends from the side holes to form a wire binding ring; the supporting unit includes a supporting rod arranged outside the wire binding tube and moving along the axial direction of the wire binding tube; in the first state, the wire binding ring is wrapped around the tracheal stent, and the closed end of the wire binding ring is inserted into the supporting rod, which is used to bind the tracheal stent to the wire binding tube and the supporting rod; in a second state, the supporting rod is staggered with the distal end of the wire binding tube and is close to the proximal end of the wire binding tube, and the supporting rod is pulled out from the closed end of the wire binding ring, which is used to unbind the tracheal stent; the tracheal stent conveyor and system are easy to release and accurately positioned.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a tracheal stent delivery device and a tracheal stent system. Background Art

[0002] Currently, tracheal stents have a wide range of applications and can be used to treat various organic stenoses of the human trachea, main bronchus, and upper, middle, and lower lobe bronchi.

[0003] In the prior art, the tracheal stent is usually loaded into the metal placement tube of the delivery device by extrusion, and the delivery device carrying the stent is sent into the diseased trachea or bronchus through a rigid bronchoscope. Then, a push rod is used to push out and implant the tracheal stent into the diseased trachea or bronchus to complete the stent release. This method is not only inconvenient to operate, but also the positioning position after release is not easy to accurately control, and there is usually a certain deviation from the desired predetermined position. It is necessary to use an optical biopsy forceps to repeatedly adjust the position of the tracheal stent, resulting in an extended operation time and an increased surgical risk. Summary of the Invention

[0004] The purpose of the present invention is to provide a tracheal stent delivery device and a tracheal stent system that are convenient for release and accurate in positioning.

[0005] To solve the above technical problems, the present invention provides a tracheal stent delivery device, which includes a binding unit and a support unit. The binding unit includes a binding wire tube and a binding wire. The binding wire is threaded through the binding wire tube and the distal end of the binding wire is fixed relative to the distal end of the binding wire tube. A plurality of side holes are opened at the distal end of the binding wire tube. In a first state, the binding wire extends out from the side holes to form a binding wire loop. The part of the binding wire loop close to the side holes is open, and the part far from the side holes is closed to form a closed end. The support unit includes a support rod disposed outside the binding wire tube and moving axially along the binding wire tube. In the first state, the binding wire loop is wound around the tracheal stent, and the closed end of the binding wire loop is threaded through the support rod to bind the tracheal stent to the binding wire tube and the support rod. In a second state, the distal end of the support rod is offset from the distal end of the binding wire tube and close to the proximal end of the binding wire tube, and the support rod is withdrawn from the closed end of the binding wire loop to unbind the tracheal stent.

[0006] The present invention also provides a tracheal stent system, which includes a tracheal stent and the aforementioned tracheal stent delivery device. The tracheal stent is made of an elastic material. In the first state, the tracheal stent is folded and bound to the binding wire tube and the support rod through the binding wire loop. In the second state, the distal end of the support rod is offset from the distal end of the binding wire tube and close to the proximal end of the binding wire tube, and the support rod is withdrawn from the closed end of the binding wire loop to unbind the tracheal stent.

[0007] The tracheal stent conveyor and stent system provided by the present invention wrap the tracheal stent around the tracheal stent and pass the closed end of the tracheal stent through the support rod, so that the tracheal stent is bound to the tracheal stent and the support rod, and the tracheal stent is untied and released by moving the support rod toward the proximal end and withdrawing it from the closed end of the tracheal stent. The doctor is allowed to use the tracheal stent conveyor to deliver the tracheal stent directly to the lesion site for release, with accurate positioning and no need for a push rod. The tracheal stent is not easy to shift after release, and the tracheal stent can be deployed after the support rod is withdrawn to release the binding wire, and the release is convenient, so that the release time of the tracheal stent is short, which can effectively reduce the risk of suffocation of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 Schematic diagram of a tracheal stent system provided in an embodiment of the present invention, wherein the tracheal stent is bound to a tracheal stent conveyor.

[0010] Figure 2 It is a schematic diagram of an insertion cap of a tracheal stent delivery device provided in an embodiment of the present invention.

[0011] Figure 3 Schematic diagram of a tracheal stent delivery device provided by an embodiment of the present invention, wherein a binding wire extends from a side hole to form a binding wire loop.

[0012] Figure 4 It is a schematic diagram of a wire binding loop formed by a wire binding provided by an embodiment of the present invention.

[0013] Figure 5 It is a partial schematic diagram of a support unit of a tracheal stent conveyor provided in an embodiment of the present invention.

[0014] Figure 6 It is a cross-sectional schematic diagram of the matching of the wire binding tube and the support rod seat of the tracheal stent conveyor provided by an embodiment of the present invention.

[0015] Figure 7 A partial schematic diagram of the tracheal stent delivery device provided in an embodiment of the present invention showing the binding wires being retracted after the tracheal stent is released.

[0016] Figure 8 It is a partial schematic diagram of a tracheal stent delivery system provided in an embodiment of the present invention, wherein the tracheal stent is bound to a wire binding tube and a support rod by a wire binding ring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] To more clearly describe the structures of the tracheal stent delivery device and the tracheal stent system of the present invention, the terms "proximal end" and "distal end" are defined herein as commonly used terms in interventional medicine. Specifically, the "distal end" refers to the end far from the operator during the surgical operation, and the "proximal end" refers to the end close to the operator during the surgical operation.

[0019] Please refer to Figures 1 to 8 simultaneously, the present invention provides a tracheal stent system 100, and the tracheal stent system 100 includes a tracheal stent 1 and a tracheal stent delivery device 2.

[0020] The tracheal stent 1 is made of an elastic material, can be folded when being bound, and can automatically return to its original state when the binding is released. In this embodiment, the tracheal stent 1 is in a cylindrical shape in its natural state (i.e., the unbound state), and as Figure 1 and Figure 8 shown, a plurality of protrusions 11 are provided on the outer circumference of the tracheal stent 1, and the protrusions 11 are used to increase the friction between the tracheal stent 1 and the diseased trachea after the tracheal stent 1 is released, so as to prevent the tracheal stent 1 from shifting after being released. Preferably, the protrusions 11 are hemispherical or cylindrical; the tracheal stent 1 can be folded when cooperating with the tracheal stent delivery device 2. In other embodiments, the shape of the tracheal stent 1 may not be limited to this. In this embodiment, the tracheal stent 1 is a silicone stent, and in other embodiments, it may not be limited to this either.

[0021] The tracheal stent delivery device 2 includes a binding unit 20, a support unit 40, and a wire locking unit 60. The binding unit 20 is used to bind the tracheal stent 1 to the distal end of the support unit 40; the support unit 40 is used to move axially along the binding unit 20 to release the binding on the tracheal stent 1; the wire locking unit 60 is provided at the proximal end of the tracheal stent delivery device 2 and is used to tighten and fix the binding wire in the binding unit 20.

[0022] As Figures 1 to 4As shown, the binding unit 20 includes a binding tube 22 and a binding wire 24. The binding wire 24 is inserted into the binding tube 22, and the distal end of the binding wire 24 is fixed relative to the distal end of the binding tube 22. A plurality of side holes 224 are formed at the distal end of the binding tube 22. In a first state, the binding wire 24 extends out from the side holes 224 to form a binding wire loop 225. The part of the binding wire loop 225 close to the side holes 224 is open, and the part away from the side holes 224 is closed to form a closed end.

[0023] Combined with Figure 1 , Figure 3 , Figure 5 and Figure 6 , the support unit 40 includes a support rod 41 disposed outside the binding tube 22 and movable along the axial direction of the binding tube 22. In the first state, the binding wire loop 225 is wound around the tracheal stent 1, and the closed end of the binding wire loop 225 is inserted through the support rod 41 to bind the tracheal stent 1 to the binding tube 22 and the support rod 41. In a second state, the support rod 41 moves proximally until the distal end of the support rod 41 is offset from the distal end of the binding tube 22 and close to the proximal end of the binding tube 22, and the support rod 41 is withdrawn from the closed end of the binding wire loop 225 to unbind the tracheal stent 1.

[0024] The wire locking unit 60 is connected to the proximal end of the binding unit 20. The proximal end of the binding wire 24 is fixed on the wire locking unit 60. The wire locking unit 60 is used to tighten the binding wire loop 225 when binding the tracheal stent 1.

[0025] Furthermore, in this embodiment, the binding unit 20 further includes an insertion cap 21 and a binding tube seat 23.

[0026] As Figure 2 shown, the insertion cap 21 is located at the distal most end of the tracheal stent delivery device 2. The distal end of the insertion cap 21 is a tip 211, which is generally conical or similar in shape as a whole, so that the insertion cap 21 can be more easily inserted into the trachea. The proximal end of the insertion cap 21 is provided with a central positioning hole 213, a side positioning hole 214 and a wire fixing hole (not shown in the figure) along the axial direction. The distal end of the binding tube 22 is fixed in the central positioning hole 213, the distal end of the binding wire 24 is fixed in the wire fixing hole, and the distal end of the support rod 41 is movably received in the side positioning hole 214. In this embodiment, the central positioning hole 213, the side positioning hole 214 and the wire fixing hole are all circular holes.

[0027] In other embodiments, the wire fixing hole may not be provided, and the distal end of the binding wire 24 may be fixed by other common methods.

[0028] In this embodiment, the insertion cap 21 includes a tapered section 215, a columnar section 216, and an extension section 217 connected in sequence from far to near; the tip 211 is located at the distal end of the tapered section 215, and the extension section 217 is arranged along the axial direction of the columnar section 216 and extends from the center of the proximal end of the columnar section 216; wherein, in the direction perpendicular to the axial direction of the insertion cap 21, the cross-sectional dimension of the extension section 217 is smaller than the cross-sectional dimension of the columnar section 216, so that a connection surface 218 is formed at the connection between the columnar section 216 and the tapered section 215, the side positioning hole 214 is formed in the connection surface 218 and extends along the axial direction of the columnar section 216, the central positioning hole 213 is formed at the proximal end of the extension section 217 and is located at the axial center position of the extension section 217, and the wire fixing hole is arranged at the bottom of the central positioning hole 213. In this embodiment, in the direction perpendicular to the axial direction of the insertion cap 21, the cross-sectional dimension of the extension section 217 is adapted to the cross-sectional dimension of the distal end of the wire binding tube 22. The significance of setting the columnar section 216 is to provide a larger position for setting the side positioning hole 214. In other embodiments, the columnar section 216 may not be provided. The significance of setting the extension section 217 is to increase the connection strength between the distal end of the wire binding tube 22 and the insertion cap 21.

[0029] To avoid puncturing the trachea or bronchus during transportation, therefore, in this embodiment, the insertion cap 21 is made of a flexible material, such as block polyether amide (PEBAX), silica gel, etc.

[0030] Such as Figure 1 , Figure 3 and Figure 7 As shown, the wire binding tube 22 is in a hollow tubular shape, so a through hole (not shown in the figure) is provided along its axial direction, and the through hole is used to accommodate the binding wire 24. The distal end of the wire binding tube 22 extends into the central positioning hole 213 and is fixed therein, and the proximal end of the wire binding tube 22 is fixed to the wire binding tube seat 23.

[0031] Such as Figure 3As shown, at a position perpendicular to the axial direction of the wire binding tube 22 and close to the distal end, a plurality of side holes 224 are provided on the wire binding tube 22. The plurality of side holes 224 are all communicated with the through hole, so that the wire 24 accommodated in the through hole can extend out from the side holes 224. Among them, the distal end of the wire binding tube 22 can be fixed in the central positioning hole 213 by medical glue bonding or ultrasonic welding, etc. In this embodiment, the distances between the plurality of side holes 224 are the same and are evenly distributed along the axial direction of the wire binding tube 22. The plurality of side holes 224 can be distributed in one row or two rows. In this embodiment, the plurality of side holes 224 are distributed in two rows, and the two rows of side holes 224 are arranged oppositely and are symmetric about the axis of the wire binding tube 22. Please refer to Figure 4 , one row of the side holes 224 correspondingly allows one wire 24 to extend out to form a corresponding wire loop 225. In each row of the side holes 224, the distance between two adjacent side holes 224 is preferably 2 mm to 4 mm; the axial distance L1 between the two side holes 224 at the head and the tail in each row is equivalent to the length of the tracheal stent 1, or slightly greater than the length of the tracheal stent 1, and preferably, L1 is greater than or equal to 100 mm. Of course, it is not limited to this.

[0032] In this embodiment, as Figure 6 shown, a convex rib 226 is provided at the proximal end of the wire binding tube 22, and the convex rib 226 has a limiting function. In other embodiments, a depression can also be formed on the wire binding tube 22 to replace the convex rib.

[0033] The wire binding tube seat 23 is also a hollow structure. Its distal end is connected to the wire binding tube 22, and its proximal end is screwed to the wire locking unit 60 by a thread.

[0034] The wire 24 is accommodated in the wire binding tube 22, and the length of the wire 24 is greater than the length of the wire binding tube 22, so that the wire loop 225 can extend out from a plurality of side holes 224 of the wire binding tube 22. Among them, the length of the formed wire loop 225 is related to the circumference after the tracheal stent 1 is folded, for example, equivalent to half, one or two circumferences, etc. In this embodiment, the number of the wires 24 is two, the number of the wire fixing holes is also two, the side holes 224 are distributed in two rows, one end of each wire 24 is fixed in one of the wire fixing holes, and the other end is connected to the wire locking unit 60. Each wire 24 corresponds to one row of side holes 224 and can extend out the wire loop 225 from the side holes 224 of the corresponding row.

[0035] The tying wire 24 needs to have good flexibility and high tensile strength. Therefore, in this embodiment, the tying wire 24 is made of multi-strand nickel-titanium wire material to meet the above requirements. The tying wire tube 22 needs to provide support for the tying wire 24 and also have a certain flexibility to avoid damaging the trachea / bronchial tube. Therefore, the tying wire tube 22 is made of a polymer material with biocompatibility and flexibility, and preferably made of polyetheretherketone (PEEK) material.

[0036] Please refer to Figure 1 、 Figure 3 and Figure 5 , the support unit 40 further includes a support rod seat 42. The support rod 41 is arranged parallel to the tying wire tube 22 and can move axially along the tying wire tube 22 until the distal end of the support rod 41 is completely staggered from the plurality of side holes 224. The distal end of the support rod 41 can be inserted into the side positioning hole 214 and can be pulled out from the side positioning hole 214. The proximal end of the support rod 41 is fixed on the support rod seat 42. A through hole 421 is provided on the support rod seat 42 along the axial direction of the support rod 41 for the tying wire tube 22 to pass through, that is, the support rod seat 42 is sleeved on the tying wire tube 22 axially movably. Among them, pulling the support rod seat 42 proximally can pull the support rod 41 out of the side positioning hole 214 and drive the support rod 41 to move axially in the proximal direction of the tracheal stent delivery device 2. The axially movable distance of the support rod 41 is greater than the axial distance L1 between the head and tail side holes 224 to ensure that the support rod 41 can be withdrawn from all the tying wire loops 225, that is, to ensure that the support rod 41 moves axially to be completely staggered from the side holes 224 (actually, the axially movable distance of the support rod 41 should be greater than the sum of the axial distance L1 between the head and tail side holes 224 and the axial distance between the first side hole 224 (the side hole 224 closest to the connection surface 218) and the connection surface 218 to ensure that the support rod 41 can be withdrawn from all the tying wires 24, but since the sum of the axial distance between the first side hole 224 and the connection surface 218 is small and can be ignored, generally only L1 needs to be considered).

[0037] In this embodiment, the outer surface of the support rod seat 42 is provided with patterns to facilitate the operator to pull the support rod 41 away from the placement cap 21 by operating the support rod seat 42. In this embodiment, as Figure 6As shown, the shape of the through hole 421 matches the shape of the proximal end of the wire binding tube 22, that is, a groove 422 is formed on the through hole 421 to cooperate with the rib 226. Since the cooperation between the rib 226 and the groove 422 plays an anti-rotation role, the wire binding tube 22 and the support rod seat 42 cannot rotate relative to each other, ensuring that the support rod 41 will not rotate relative to the wire binding tube 22. Therefore, after the closed end of the wire binding loop 225 is inserted through the support rod 41, the support rod 41 remains stable, and when the support rod 41 is withdrawn from the closed end of the wire binding loop 225, it can only move linearly along the axial direction to ensure smooth withdrawal. It can be understood that the length of the rib 226 on the wire binding tube 22 should be greater than the axially movable distance of the support rod 41 so that the rib 226 can always cooperate with the groove 422 during the movement of the support rod 41. In other embodiments, if a depression is formed on the wire binding tube 22 to replace the rib 226, a rib matching the depression can be formed on the support rod seat 42 as long as the relative rotation between the wire binding tube 22 and the support rod seat 42 can be prevented. In addition, at least one axially matching plane can be respectively provided in the through holes 421 of the wire binding tube 22 and the support rod seat 42 as an anti-rotation structure.

[0038] Since a relatively large force is generated on the support rod 41 after the wire binding 24 is tightened, the support rod 41 needs to provide sufficient supporting force to keep the wire binding 24 stable. Therefore, preferably, the support rod 41 is made of a biocompatible and hard metal or polymer material, such as stainless steel, polyoxymethylene (POM), etc.

[0039] Combined Figure 1 with Figure 3 , the wire locking unit 60 includes a main body 61 and wire lockers 62 equal in number to the wire bindings 24. The wire lockers 62 are used to fix the proximal ends of the wire bindings 24 and loosen or tighten the wire bindings 24. The main body 61 includes a main branch 63 and side branches 64 equal in number to the wire bindings 24 extending from the main branch. The wire lockers 62 are detachably connected to one of the side branches 64 correspondingly; the wire binding tube 22, the main branch 63 and the side branches 64 communicate with each other, and the distal end of one wire binding 24 is fixed to one wire locker 62 correspondingly.

[0040] In this embodiment, the main body 61 includes two side branches 64, namely a four-way structure. Two tying wires 24 are respectively led out from the tying wire tube 22 via one of the side branches 64. In this embodiment, two wire locking devices 62 are included, and each wire locking device 62 is connected to the end of a side branch 64. The wire locking device 62 includes a distal knob 631 and a proximal knob 632; the distal knob 631 is used to screw the wire locking device 62 tightly onto the corresponding side branch 64; the proximal knob 632 is used to screw the tying wire 24 tightly onto the wire locking device 62. It can be understood that if only one tying wire 24 is provided, only one side branch 64 and one wire locking device 62 may also be provided.

[0041] Combined with Figure 1 , Figure 3 , Figure 4 and Figure 8 , a specific operation method of the tracheal stent system 100 provided by the embodiment of the present invention can be as follows: First, extend each tying wire loop 225 from the corresponding side hole 224 of the tying wire tube 22, fold the tracheal stent 1 axially, place the tying wire tube 22 in the folding gap formed by the axial folding of the tracheal stent 1, wind the tying wire loop 225 around the circumference of the tracheal stent 1 and then pass it through the support rod 41. Then, insert the distal end of the support rod 41 into the side positioning hole 214; After that, pull the tying wire 24 through the wire locking device 62 to completely tighten the tracheal stent 1, tighten the distal knob 631 clockwise to screw the wire locking device 62 tightly onto the side branch 64, and then tighten the proximal knob 632 clockwise to tighten and fix the tying wire 24. Thus, the tracheal stent 1 is bound to the tying wire tube 22 and the support rod 41 through the tying wire loop 225; Then, the tracheal stent delivery device 2 with the tracheal stent 1 bound is inserted into the trachea through a rigid bronchoscope. After the tracheal stent 1 is sent to the lesion site, withdraw the support rod 41 proximally so that the support rod 41 is withdrawn from the closed end of the tying wire loop 225, and the tying wire loop 225 falls off the tracheal stent 1, releasing the restraint of the tying wire loop 225 on the tracheal stent 1, and the tracheal stent 1 is then released; Finally, the entire tracheal stent delivery device 2 is withdrawn. It can be understood that as Figure 7 shown, after the tying wire loop 225 falls off, the distal knob 631 of the wire locking device 62 can be loosened counterclockwise and the wire locking device 62 can be withdrawn, and the tying wire 24 can be gradually withdrawn until the tying wire 24 is completely or substantially retracted into the tying wire tube 22.

[0042] It can be understood that in other embodiments, the tying wire loop 225 can also be wound around the tracheal stent 1 for two or more turns. However, the fewer the number of turns, the easier it is to release the binding after the support rod 41 is withdrawn, and the shorter the release time of the tracheal stent 1.

[0043] It can be understood that in other embodiments, the wire binding tube 22 can also be placed outside the folding gap formed by the axial folding of the tracheal stent 1, away from the side of the folding gap opening. In this case, if side holes 224 are set on both sides of the wire binding tube 22, each wire binding ring 225 can be passed onto the support rod 41 after at least half a circle, and the two axially symmetrical side holes 224 just allow the corresponding two wire binding rings 225 to surround the tracheal stent 1 once, and the tracheal stent 1 can be tied up by tightening the binding wire 24; but if the side hole 224 is set on only one side of the wire binding tube 22, each wire binding ring 225 can be passed onto the support rod 41 to bind the tracheal stent 1 only after at least one circle.

[0044] Compared with the existing conveyor that uses a push rod to push out and release the tracheal stent, the tracheal stent conveyor 2 and tracheal stent system 100 provided by the present invention, by wrapping the tracheal stent 1 with a wire binding ring 225 and passing the closed end of the wire binding ring 225 onto the support rod 41, the tracheal stent 1 is bound to the wire binding tube 22 and the support rod 41, and the tracheal stent 1 is untied and released by moving the support rod 41 proximally and pulling it out from the closed end of the wire binding ring 225, allowing the doctor to use the tracheal stent conveyor 2 to directly deliver the tracheal stent 1 to the lesion location for release, with accurate positioning, no push rod required, and the tracheal stent 1 is not easy to shift after release, and after the support rod 41 is pulled out to release the binding wire 24, the tracheal stent 1 can be unfolded, and the release is convenient, so that the release time of the tracheal stent 1 is short, which can effectively reduce the risk of suffocation of the patient. In addition, the tracheal stent delivery device 2 of the present invention does not require a metal insertion tube. After the tracheal stent 1 is bound to the wire binding tube 22 and the support rod 41 through the wire binding ring 225, the radial dimension is smaller. In addition, the use of a flexible insertion cap 21 can avoid the risk of the metal implant damaging the glottis and reduce damage to the airway.

[0045] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A tracheal stent delivery device, characterized in that, It includes a binding unit and a supporting unit; The binding unit includes a binding tube and a binding wire. The binding wire is threaded through the binding tube and the distal end of the binding wire is fixed relative to the distal end of the binding tube. A plurality of side holes are formed at the distal end of the binding tube. In a first state, the binding wire extends out from the side holes to form a binding wire loop. The part of the binding wire loop close to the side holes is open, and the part away from the side holes is closed to form a closed end. Wherein, the number of the binding wires is two, and the plurality of side holes formed at the distal end of the binding tube are arranged in two columns. The two columns of side holes are oppositely arranged and symmetric about the axis of the binding tube. Each column of side holes corresponds to one of the binding wires and allows the corresponding binding wire to extend out to form a binding wire loop; The supporting unit includes a support rod arranged outside the binding tube and axially movable along the binding tube. In the first state, the binding wire loop is wound around the tracheal stent, and the closed end of the binding wire loop is threaded through the support rod to bind the tracheal stent to the binding tube and the support rod. In a second state, the distal end of the support rod is staggered from the distal end of the binding tube and close to the proximal end of the binding tube, and the support rod is withdrawn from the closed end of the binding wire loop to unbind the tracheal stent. The axially movable distance of the support rod is greater than the axial distance between the head and tail side holes in each column of side holes; The tracheal stent delivery device further includes a wire locking unit connected to the proximal end of the binding unit. The proximal end of the binding wire is fixed on the wire locking unit, and the wire locking unit is used to tighten the binding wire loop when binding the tracheal stent.

2. The tracheal stent delivery device according to claim 1, wherein The binding unit further includes an insertion cap. The distal end of the insertion cap is a conical tip, and the distal end of the binding tube is fixed to the proximal end of the insertion cap.

3. The tracheal stent delivery device according to claim 2, characterized in that The proximal end of the insertion cap is axially provided with a central positioning hole and a side positioning hole. The distal end of the binding tube is fixed in the central positioning hole, and the distal end of the support rod is movably received in the side positioning hole.

4. The tracheal stent delivery device according to claim 3, characterized in that, The proximal end of the insertion cap is axially further provided with a wire fixing hole, and the distal end of the binding wire is fixed in the wire fixing hole.

5. The tracheal stent delivery device according to claim 2, characterized in that The insertion cap is made of a flexible material.

6. The tracheal stent delivery device according to claim 1, wherein, In each column of side holes, the distance between adjacent two side holes ranges from 2 millimeters to 4 millimeters.

7. The tracheal stent delivery device according to claim 1, characterized in that The binding unit further includes a binding tube seat. The proximal end of the binding tube is fixed on the binding tube seat, and the binding tube seat is connected to the wire locking unit.

8. The tracheal stent delivery device according to claim 1, wherein The supporting unit further includes a support rod seat axially movably sleeved on the binding tube. The proximal end of the support rod is fixed to the support rod seat.

9. The tracheal stent delivery device according to claim 8, wherein A rotation prevention structure is provided between the binding tube and the support rod seat to prevent the support rod seat from driving the support rod to rotate relative to the binding tube.

10. The tracheal stent delivery device according to claim 1, wherein, The wire locking unit includes a main body and wire lockers equal in number to the binding wires; the main body includes a main branch and side branches extending from the main branch and equal in number to the binding wires; one wire locker corresponds to and is detachably connected to one side branch; the binding tube, the main branch and the side branches communicate with each other, and the proximal end of one binding wire is correspondingly fixed on one wire locker.

11. The tracheal stent delivery device according to claim 10, wherein, The wire locking device includes a proximal knob and a distal knob; the distal knob is used to screw the wire locking device tightly onto the corresponding side branch; the proximal knob is used to wind the proximal end of the corresponding binding wire around the corresponding wire locking device.

12. The tracheal stent delivery device according to claim 1, characterized in that, The wire binding tube is made of a biocompatible and flexible polymer material; the support rod is made of a biocompatible and rigid metal or polymer material.

13. A tracheal stent system, characterized in that, It includes a tracheal stent and a tracheal stent delivery device according to any one of claims 1 to 12, wherein the tracheal stent is made of an elastic material. In the first state, the tracheal stent is folded and bound to the wire binding tube and the support rod through the wire binding loop; in the second state, the distal end of the support rod is offset from the distal end of the wire binding tube and close to the proximal end of the wire binding tube, and the support rod is withdrawn from the closed end of the wire binding loop to release the tracheal stent.

14. The tracheal stent system according to claim 13, characterized in that, The tracheal stent is cylindrical in its natural state, and a plurality of protrusions are provided on the outer circumference of the tracheal stent.

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