Rapid exchange stent conveying device

Abstract

The invention provides a rapid exchange stent conveying device and relates to the technical field of stent conveying, the rapid exchange stent conveying device is used for releasing a stent to the far end along a guide wire, and the conveying device comprises an outer tube and an inner tube inserted into the outer tube; the far end of the inner tube is provided with a guide wire inlet, and the side wall is provided with a guide wire outlet; the outer tube is provided with a receding part extending to the far end, and the receding part is used for receding and leading out the guide wire extending out of the guide wire outlet so that the outer tube and the inner tube can move relatively, and the inner tube can push the support to be released from the far end of the outer tube. The length, extending towards the near end of the inner tube, of the guide wire is shortened, rapid exchange can be achieved, the intraoperative operation time is shortened, the guide wire is prevented from being clamped between the outer tube and the inner tube, and then it is ensured that the stent can be smoothly released.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS The present invention claims priority to Chinese patent application number 202411087412.3 filed with the Chinese Patent Office on August 8, 2024, entitled “Rapid Exchange Stent Delivery Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of stent delivery, and in particular to a rapid exchange stent delivery device. Background Art

[0003] Normally, the guide wire of a covered stent or a bare stent needs to be extended to the handle end. The guide wire extends a long distance along the outer tube, and the operation takes a long time during the operation, which makes it difficult to improve the efficiency of the operation. If the guide wire is led out from the guide wire outlet near the distal end of the inner tube side wall, an opening must also be made in the outer tube side wall so that the guide wire can extend through the outer tube opening. However, when releasing the stent, the inner tube needs to slide relative to the outer tube, and the guide wire outlet of the inner tube and the opening of the outer tube side wall are intertwined. The guide wire will be stuck between the inner tube and the outer tube, which will lead to the technical problem that the stent cannot be released smoothly. Summary of the Invention

[0004] The object of the present invention is to provide a rapid exchange stent delivery device to alleviate the technical problems in the prior art of stent delivery devices, such as long operation time and easy jamming of stent release.

[0005] In a first aspect, the present invention provides a rapid exchange stent delivery device for releasing a stent distally along a guide wire, the delivery device comprising: an outer tube and an inner tube inserted inside the outer tube; The inner tube has a guide wire inlet at the distal end and a guide wire outlet at the side wall; The outer tube has a distally extending portion for avoiding and leading out the guide wire extending from the guide wire outlet, so that the outer tube and the inner tube can move relative to each other and the inner tube pushes the stent to be released from the distal end of the outer tube.

[0006] In combination with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the give way portion includes a give way groove, and the give way groove is arranged on the side wall of the outer tube and extends along the axial direction of the outer tube.

[0007] In combination with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the outer tube comprises: a tube segment and a flat body segment connected to the proximal end of the tube segment; The flat body section is arc-shaped in a cross section perpendicular to the axis of the outer tube, and the flat body section is located on the side of the inner tube away from the guide wire outlet.

[0008] In combination with the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the outer tube comprises: a first tube segment and an opening segment connected to the proximal end of the first tube segment, and the first tube segment is sleeved on the inner tube; The evacuation portion includes a gap portion located between the first tube section and the inner tube, and an open portion provided at the opening section.

[0009] In combination with the third possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the opening portion has a first guide surface that is inclined toward the outside of the guidewire outlet along the distal end toward the proximal end.

[0010] In combination with the third possible implementation of the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein the proximal end of the opening section is connected to a second tube section that is sleeved on the inner tube.

[0011] In combination with the third possible implementation of the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the inner diameter of the first pipe segment is greater than or equal to the inner diameter of the second pipe segment.

[0012] In combination with the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein a guide portion is provided inside the inner tube, and the guide portion is located proximal to the guide wire outlet.

[0013] In combination with the first aspect, the present invention provides an eighth possible implementation of the first aspect, wherein the guide portion has a second guide surface, and the second guide surface is an inclined surface inclined from the distal end to the proximal end toward the outside of the guidewire outlet.

[0014] In combination with the first aspect, the present invention provides a ninth possible implementation of the first aspect, wherein the inner tube is connected to a push piece, the push piece is inserted into the outer tube, and the push piece is used to push the bracket to be released from the distal end of the outer tube.

[0015] In combination with the first aspect, the present invention provides a tenth possible implementation of the first aspect, wherein the rapid exchange stent delivery device further includes a recovery member, the recovery member is provided on the distal side of the push member, and the recovery member is used to recover the released stent into the outer tube.

[0016] In combination with the first aspect, the present invention provides an eleventh possible implementation manner of the first aspect, wherein the side wall of the outer tube is provided with a clearance groove extending from the clearance portion toward the proximal end; When the inner tube slides toward the proximal end relative to the outer tube, the guide wire extending from the guide wire outlet slides toward the proximal end along the clearance groove.

[0017] In combination with the first aspect, the present invention provides a twelfth possible implementation manner of the first aspect, wherein the proximal ends of the outer tube and the inner tube are respectively connected to operating handles, and the operating handles are used to drive the inner tube to slide relative to the outer tube.

[0018] In combination with the first aspect, the present invention provides a thirteenth possible implementation of the first aspect, wherein the rapid exchange stent delivery device further includes a support member, the support member is disposed in the inner tube, and the distal end of the support member does not extend beyond the guide wire outlet.

[0019] In combination with the first aspect, the present invention provides a fourteenth possible implementation manner of the first aspect, wherein the stent is fixed to the distal end of the push member or the outer surface of the inner tube by at least one fixing line.

[0020] In combination with the first aspect, the present invention provides a fifteenth possible implementation manner of the first aspect, wherein the diameter of the inner tube gradually increases from the distal end to the proximal end; Alternatively, the wall thickness of the outer tube gradually increases from the distal end to the proximal end.

[0021] The embodiments of the present invention bring the following beneficial effects: an inner tube with a guide wire inlet at the distal end is adopted, and a guide wire outlet is opened on the side wall of the inner tube, the inner tube is inserted into the outer tube, and the outer tube has a yielding portion extending toward the distal end, which is used to avoid and lead out the guide wire extending from the guide wire outlet, so that the outer tube and the inner tube can move relative to each other, and the inner tube pushes the stent to be released from the distal end of the outer tube, shortening the length of the guide wire extending to the proximal end of the inner tube, enabling rapid exchange, shortening the intraoperative operation time, avoiding the guide wire being stuck between the outer tube and the inner tube, and thus ensuring that the stent can be released smoothly.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 A partial schematic diagram of an outer tube, an inner tube, and a guide wire of a rapid exchange stent delivery device provided by an embodiment of the present invention; Figure 2A cross-sectional view of the distal end of a rapid exchange stent delivery device provided by an embodiment of the present invention; Figure 3 A cross-sectional view of a rapid exchange stent delivery device at a guidewire outlet provided by an embodiment of the present invention; Figure 4 A schematic diagram of an outer tube of a rapid exchange stent delivery device provided by an embodiment of the present invention; Figure 5 A schematic diagram of an outer tube, an inner tube, and a stent of another rapid exchange stent delivery device provided by an embodiment of the present invention; Figure 6 A cross-sectional view of another rapid exchange stent delivery device provided by an embodiment of the present invention; Figure 7 A schematic diagram of a rapid exchange stent delivery device provided in an embodiment of the present invention.

[0025] Icons: 100-outer tube; 011-tube body section; 012-flat body section; 013-first tube section; 014-opening section; 015-second tube section; 110-yield portion; 111-yield chute; 112-gap portion; 113-opening portion; 200-inner tube; 201-guide wire inlet; 202-guide wire outlet; 203-guide portion; 300-guide wire; 400-bracket; 500-push member; 600-operating handle; 700-support member. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. "Far end" and "proximal end" are referenced to the operating end or person, with the farther end being the "far end" and the closer end being the "proximal end". In addition, the terms "first", "second" and "third" are only used to describe the difference in names, and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, unless otherwise separately marked, should be understood as basic quantities of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] As shown in Figure 1 , Figure 2 and Figure 5 , the rapid exchange stent delivery device provided by the embodiment of the present application is used for releasing the stent 400 along the guidewire 300 to the distal end, and the delivery device comprises an outer tube 100 and an inner tube 200 inserted into the inner tube 100; the inner tube 200 has a guidewire inlet 201 at the distal end, and a guidewire outlet 202 is formed in the side wall; the outer tube 100 has a distally extending accommodation portion 110, which is used for avoiding and leading out the guidewire 300 extending from the guidewire outlet 202, so that the outer tube 100 and the inner tube 200 can move relatively, and the inner tube 200 pushes the stent 400 to release from the distal end of the outer tube 100.

[0030] When the stent 400 is delivered, the outer tube 100 and the inner tube 200 move together along the guidewire 300 to the distal end, so that the stent 400 in the inner tube 100 is delivered to the predetermined position. When the stent 400 needs to be released, the inner tube 200 pushes the stent 400 to the distal end relative to the outer tube 100, so that the stent 400 can be pushed out from the distal end of the outer tube 100 and released. The released stent 400 can realize radial expansion by its own elasticity. When the inner tube 200 moves to the distal end relative to the outer tube 100, the guidewire 300 extending from the guidewire outlet 202 slides along the accommodation portion 110 to the distal end, so as to avoid the guidewire 300 being stuck between the outer tube 100 and the inner tube 200, thereby ensuring the smooth release action of the stent 400. In addition, the guidewire 300 extending from the guidewire outlet 202 can be led out through the accommodation portion 110, which shortens the length of the guidewire 300 extending to the proximal end of the outer tube 100, and further shortens the operation time of the exchange stent.

[0031] In another embodiment, when delivering the stent 400, the outer tube 100 and the inner tube 200 move distally together along the guide wire 300, thereby delivering the stent 400 inside the outer tube 100 to a predetermined position. When the stent 400 needs to be released, the outer tube 100 moves proximally relative to the inner tube 200, and the inner tube 200 pushes against the stent 400 to be released from the distal end of the outer tube 100. The released stent 400 can achieve radial expansion through its own elasticity. When the outer tube 100 moves proximally relative to the inner tube 200, the clearance portion 110 slides proximally along the guide wire 300 extending from the guide wire outlet 202, thereby preventing the guide wire 300 from being stuck between the outer tube 100 and the inner tube 200.

[0032] like Figure 1 and Figure 4 As shown, in the embodiment of the present invention, the yielding portion 110 includes a yielding slot 111 . The yielding slot 111 is provided on the side wall of the outer tube 100 and extends along the axial direction of the outer tube 100 .

[0033] The proximal end of the clearance groove 111 corresponds to the guide wire outlet 202, and the clearance groove 111 extends distally along the sidewall of the outer tube 100. When the inner tube 200 moves distally relative to the outer tube 100 or the outer tube 100 moves proximally relative to the inner tube 200, the guide wire 300 extending from the guide wire outlet 202 can slide relative to the clearance groove 111, thereby ensuring that the inner tube 200 can slide smoothly relative to the outer tube 100.

[0034] See also Figure 1 and Figure 4 The outer tube 100 includes: a tube body segment 011 and a flat body segment 012 connected to the proximal end of the tube body segment 011; the flat body segment 012 is arc-shaped in a cross-section perpendicular to the axis of the outer tube 100, and the flat body segment 012 is located on the side of the inner tube 200 away from the guide wire outlet 202. In this way, a larger opening is formed on the side of the flat body segment 012 toward the guide wire 300 extending from the guide wire outlet 202. The guide wire 300 can be led out through the opening and can also slide along the opening toward the distal end, so that the inner tube 200 can slide smoothly relative to the outer tube 100.

[0035] In another embodiment, see Figure 2 、 Figure 5 and Figure 6 As shown, the outer tube 100 includes: a first tube segment 013 and an opening segment 014 connected to the proximal end of the first tube segment 013, and the first tube segment 013 is sleeved with the inner tube 200; the yield portion 110 includes: a gap portion 112 located between the first tube segment 013 and the inner tube 200, and an open portion 113 arranged at the opening segment 014.

[0036] Specifically, the inner diameter of the first tube segment 013 is greater than the outer diameter of the inner tube 200, so that the gap portion 112 can be formed between the first tube segment 013 and the inner tube 200. The guide wire 300 extending from the guide wire outlet 202 can be introduced through the opening portion 113, and when the inner tube 200 moves distally relative to the outer tube 100 or the outer tube 100 moves proximally relative to the inner tube 200, the guide wire 300 extending from the guide wire outlet 202 can slide into the gap portion 112 through the opening portion 113, so that the inner tube 200 and the outer tube 100 do not slide and jam, and the stent 400 can be smoothly released.

[0037] Optionally, the opening portion 113 has a first guide surface inclined outward of the guide wire outlet 202 in a direction from the distal end to the proximal end. The first guide surface is used to change the direction of the guide wire 300 extending from the guide wire outlet 202, so as to prevent the guide wire 300 from being stuck between the guide wire outlet 202 and the outer tube 100.

[0038] Further, the proximal end of the opening segment 014 is connected with a second tube segment 015 sleeving the inner tube 200, as shown in Figure 5 and Figure 7 , the second tube segment 015 extends proximally and is connected with the operation handle 600.

[0039] In an optional embodiment, a gap slot can be arranged on the side wall of the second tube segment 015, and the guide wire 300 extending from the guide wire outlet 202 can slide along the gap slot when the inner tube 200 slides proximally relative to the outer tube 100.

[0040] As shown in Figure 5 and Figure 6 , the inner diameter of the first tube segment 013 is greater than or equal to the inner diameter of the second tube segment 015, and the second tube segment 015 is in gap fit with the inner tube 200, so as to ensure that the inner tube 200 can smoothly slide along the outer tube 100.

[0041] The stent 400 in the embodiment is arranged between the inner tube 200 and the outer tube 100. Optionally, the stent 400 can be fixed to the outer surface of the inner tube 200 by at least one fixing line; in the case that the first tube segment 013 of the outer tube 100 is removed, so that the stent 400 is directly exposed or partially exposed to the external environment, the stent 400 can be kept connected with the pushing member 500 or the inner tube 200 by the fixing line, so that the stent 400 is in a contracted state in the unreleased state. In the case that the stent 400 is allowed to be released, the stent 400 is released and expanded by pulling the fixing line. Optionally, the distal end of the pushing member 500 is connected with the stent 400 by at least one fixing line, and of course the pushing member 500 can only abut against the stent 400 without being connected with the stent 400, which is not limited herein.

[0042] Optionally, in order to ensure the pushing force of the inner tube 200 and to ensure that the inner tube 200 and the outer tube 100 do not get stuck when sliding relative to each other, the diameter of the inner tube 200 in this embodiment gradually increases from the distal end to the proximal end; or, the wall thickness of the outer tube 100 gradually increases from the distal end to the proximal end. In this embodiment, the diameter of the distal end of the inner tube 200 is smaller than the diameter of the proximal end of the inner tube 200. That is, the end of the inner tube 200 close to the operating handle 600 is thicker, and the end of the inner tube 200 away from the operating handle 600 is thinner. Of course, the distal end of the inner tube 200 can also be locally thickened or stepped thickened, which is not limited here. Stepped thickening means that the inner tube 200 gradually thickens from the distal end to the proximal end. The diameter of the inner tube 200 can also be the same throughout, which is not limited here. When the diameter of the outer tube 100 remains unchanged, the wall thickness of the outer tube gradually increases from the distal end to the proximal end. The outer tube 100 may also be partially thickened only at the proximal end, which is not limited here. like Figure 3 、 Figure 5 and Figure 6 As shown, in an optional embodiment, a guide portion 203 is provided inside the inner tube 200. The guide portion 203 is located proximal to the guide wire outlet 202 and has an inclined surface inclined from the distal end to the proximal end toward the outside of the guide wire outlet 202.

[0043] The guide wire 300 enters from the guide wire inlet 201 at the distal end of the inner tube 200 and extends toward the guide wire outlet 202. The guide wire 300 extending to the guide wire outlet 202 can be tilted outward along the inclined surface of the guide portion 203, so that the guide wire 300 can be smoothly led out.

[0044] The guide portion 203 has a second guide surface, which is an inclined surface that slopes from the distal end toward the proximal end toward the outside of the guidewire outlet 202. The second guide surface is used to guide the guidewire 300 out of the guidewire outlet 202 to prevent the guidewire 300 from becoming stuck between the inner tube 200 and the outer tube 100. The second guide surface can be directly formed from the wall material of the inner tube 200, for example, by forming an inclined surface through thermoforming, laser cutting, or mechanical cutting processes, so that the guidewire 300 can naturally slide out of the guidewire outlet 202 along the guide surface.

[0045] Optionally, the second guide surface shell is formed by filling and curing glue. The cured glue forms a smooth, transitional slope, which reduces resistance to the passage of the guidewire 300. Alternatively, the second guide surface can be formed from a separately manufactured sloped component, which is fixedly embedded in the inner tube 200 and located near the guidewire outlet 202. This sloped component is secured to the inner tube 200 by bonding or interference fit. The second guide surface can be made of metal or polymer materials, without limitation.

[0046] See also Figure 5 and Figure 6The inner tube 200 is connected to a push member 500, which is inserted into the outer tube 100 and is used to push the stent 400 to release it from the distal end of the outer tube 100. When the inner tube 200 slides distally along the outer tube 100 or the outer tube 100 moves proximally relative to the inner tube 200, the inner tube 200 drives the push member 500 to slide distally, pushing the stent 400 to be released from the distal end of the outer tube 100 via the push member 500.

[0047] Optionally, the rapid exchange stent delivery device in this embodiment further includes a recovery member, and a recovery member is provided on the distal side of the push member 500, and the recovery member is used to recover the released stent 400 into the outer tube 100. Optionally, the recovery member is used to drive the released stent to move in the opposite direction of the push direction so as to recover the released stent 400 into the outer tube 100. Optionally, the push member is connected to the recovery member, and the end of the recovery member away from the push member 500 is connected to the stent 400, and the recovery member is used to recover the released stent 400 into the outer tube 100. Of course, the stent 400 can also be provided to cover the recovery member, which is not limited here. When the stent 400 needs to be adjusted or recovered after being released, a pull-back force is applied by the push member 500, so that the recovery member drives the stent 400 to move toward the proximal end and re-enter the internal cavity of the outer tube 100. Optionally, the recovery member may be a flexible wire, metal wire, or the like, with its distal end connected to the stent 400. The shape and material of the recovery member are not limited herein, as long as they facilitate the recovery of the stent 400. The recovery member may be connected to the stent 400 using a collar, a snap fit, an adhesive, a wire wrap, or other connection methods. The connection method of the recovery member to the stent 400 and the push member 500 is not limited herein.

[0048] Optionally, in order to facilitate the recovery of the stent 400 , the distal end of the outer tube 100 may be provided with a conical or flared structure.

[0049] like Figure 3 and Figure 6 As shown, in an optional embodiment, the side wall of the outer tube 100 is provided with a clearance groove extending from the clearance portion 110 toward the proximal end; when the inner tube 200 slides proximally relative to the outer tube 100, the guide wire 300 extending from the guide wire outlet 202 slides proximally along the clearance groove.

[0050] like Figure 2 、 Figure 5 and Figure 7As shown, the proximal ends of the outer tube 100 and the inner tube 200 are respectively connected to an operating handle 600, which is used to drive the inner tube 200 to slide relative to the outer tube 100. In addition, in an optional embodiment, the operating handle 600 may also be provided with a snap or threaded locking structure to lock the inner tube 200 relative to the outer tube 100, and unlock only when the stent 400 is released. The operating handle 600 drives the inner tube 200 to slide distally relative to the outer tube 100, thereby releasing the stent 400 from the distal end of the outer tube 100.

[0051] Optionally, the rapid exchange stent delivery device in this embodiment further includes a support member 700 disposed within the inner tube 200, with the distal end of the support member 700 extending no further than the guidewire outlet 202. Optionally, one end of the support member in this embodiment is connected to the operating handle 600, and the other end of the support member extends distally and into the inner tube 200. The support member provides radial rigidity to the inner tube 200, preventing it from collapsing or excessively deforming during delivery, thereby ensuring that the guidewire 300 can move normally within the inner tube 200 and enabling smooth release or recovery of the stent 400. The provision of the support member also enhances the inner tube 200's resistance to bending, ensuring that the delivery force can be effectively transmitted to the distal end, and improving operational accuracy. To prevent the guidewire 300 from interfering with its passage through the guidewire outlet 202 and becoming stuck between the inner tube 200 and the outer tube 100, the end of the support member distal to the operating handle 600 extends no further than the guidewire outlet 202.

[0052] The support member in this embodiment is a support wire. Of course, the support member can also be designed in other shapes and structures, which are not limited here. To meet the support requirements of different sections of the inner tube 200, the rigidity of the support member can be uniformly distributed or gradually distributed along the length. For example, the diameter of the support member can gradually decrease from the end closest to the operating handle 600 to the end farther away from the operating handle 600; or the support member can be thickened in the middle, etc., which are not limited here.

[0053] Optionally, the support member in this embodiment is threadedly connected to the operating handle 600. Of course, the support member can also be connected to the operating handle 600 by other means such as snap connection, crimping, wire winding, etc., which are not limited here.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid exchange stent delivery device for releasing a stent (400) distally along a guide wire (300), characterized in that: The rapid exchange stent delivery device comprises: an outer tube (100) and an inner tube (200) inserted into the outer tube (100); The inner tube (200) has a guide wire inlet (201) at the distal end and a guide wire outlet (202) at the side wall; The outer tube (100) has a yielding portion (110) extending toward the distal end for avoiding and leading out the guide wire (300) extending from the guide wire outlet (202), so that the outer tube (100) and the inner tube (200) can move relative to each other and the inner tube (200) can push the stent (400) to be released from the distal end of the outer tube (100).

2. The rapid exchange stent delivery device according to claim 1, characterized in that: The yielding portion (110) comprises a yielding chute (111), wherein the yielding chute (111) is provided on a side wall of the outer tube (100) and extends along the axial direction of the outer tube (100).

3. The rapid exchange stent delivery device according to claim 2, characterized in that: The outer tube (100) comprises: a tube section (011) and a flat body section (012) connected to the proximal end of the tube section (011); The flat body section (012) is arc-shaped in a cross section perpendicular to the axis of the outer tube (100), and the flat body section (012) is located on the side of the inner tube (200) facing away from the guide wire outlet (202).

4. The rapid exchange stent delivery device according to claim 1, characterized in that: The outer tube (100) comprises: a first tube section (013) and an opening section (014) connected to the proximal end of the first tube section (013); the first tube section (013) is sleeved with the inner tube (200); The yielding portion (110) comprises: a gap portion (112) located between the first tube section (013) and the inner tube (200), and an opening portion (113) provided at the opening section (014).

5. The rapid exchange stent delivery device according to claim 4, characterized in that: The opening portion (113) has a first guide surface that is inclined from the distal end to the proximal end and toward the outside of the guide wire outlet (202).

6. The rapid exchange stent delivery device according to claim 4, characterized in that: The proximal end of the opening section (014) is connected to a second tube section (015) sleeved with the inner tube (200).

7. The rapid exchange stent delivery device according to claim 6, characterized in that: The inner diameter of the first pipe section (013) is greater than or equal to the inner diameter of the second pipe section (015).

8. The rapid exchange stent delivery device according to any one of claims 1 to 7, characterized in that: A guide portion (203) is provided inside the inner tube (200), and the guide portion (203) is located at the proximal end of the guide wire outlet (202).

9. The rapid exchange stent delivery device according to claim 8, characterized in that: The guide portion (203) has a second guide surface, which is an inclined surface that is inclined from the distal end to the proximal end toward the outside of the guide wire outlet (202).

10. The rapid exchange stent delivery device according to any one of claims 1 to 7, characterized in that: The inner tube (200) is connected to a push member (500), the push member (500) is inserted into the outer tube (100), and the push member (500) is used to push the bracket (400) to be released from the distal end of the outer tube (100).

11. The rapid exchange stent delivery device according to claim 10, characterized in that: The bracket (400) is fixed to the distal end of the push member (500) or the outer surface of the inner tube (200) by binding with at least one fixing line.

12. The rapid exchange stent delivery device according to claim 10, characterized in that: The rapid exchange stent delivery device further comprises a recovery member, which is provided on the distal end side of the push member (500) and is used to recover the released stent (400) into the outer tube (100).

13. The rapid exchange stent delivery device according to any one of claims 1 to 7, characterized in that: The side wall of the outer tube (100) is provided with a clearance groove extending from the clearance portion (110) toward the proximal end; When the inner tube (200) slides toward the proximal end relative to the outer tube (100), the guide wire (300) extending from the guide wire outlet (202) slides toward the proximal end along the clearance groove.

14. The rapid exchange stent delivery device according to any one of claims 1 to 7, characterized in that: The proximal ends of the outer tube (100) and the inner tube (200) are respectively connected to an operating handle (600), and the operating handle (600) is used to drive the inner tube (200) to slide relative to the outer tube (100).

15. The rapid exchange stent delivery device according to any one of claims 1 to 7, characterized in that: The rapid exchange stent delivery device further comprises a support member (700), wherein the support member (700) is disposed in the inner tube (200), and the distal end of the support member (700) does not extend beyond the guide wire outlet (202).

16. The rapid exchange stent delivery device according to any one of claims 1 to 7, characterized in that: The diameter of the inner tube (200) gradually increases from the distal end to the proximal end; Alternatively, the wall thickness of the outer tube (100) gradually increases from the distal end to the proximal end.

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