Rapid exchange stent conveying device

Abstract

The utility model 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 in 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

Technical Field

[0001] The utility model relates to the technical field of stent delivery, in particular to a rapid exchange stent delivery device. Background Art

[0002] Normally, the guide wire of a coated stent or a bare stent needs to extend 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 is also required 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. Utility Model Content

[0003] The utility model aims to provide a rapid exchange stent delivery device to alleviate the technical problems in the prior art that the operation of the stent delivery device is time-consuming and the stent is easily stuck when released.

[0004] In a first aspect, the utility model provides a rapid exchange stent delivery device for releasing a stent toward a distal end along a guide wire, the delivery device comprising: an outer tube and an inner tube inserted inside the outer tube;

[0005] The inner tube has a guide wire inlet at the distal end and a guide wire outlet at the side wall;

[0006] The outer tube has a yielding portion extending toward the distal end 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.

[0007] In combination with the first aspect, the utility model provides a first possible implementation manner of the first aspect, wherein the giving way portion includes a giving way groove, and the giving way groove is arranged on the side wall of the outer tube and extends along the axial direction of the outer tube.

[0008] In combination with the first possible implementation of the first aspect, the utility model provides a second possible implementation of the first aspect, wherein the outer tube comprises: a tube body segment and a flat body segment connected to the proximal end of the tube body segment;

[0009] 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 at the side of the inner tube away from the guide wire outlet.

[0010] In combination with the first aspect, the utility model 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 with the inner tube;

[0011] The evacuation portion includes: a gap portion located between the first tube section and the inner tube, and a notch arranged in the opening section.

[0012] In combination with the third possible implementation of the first aspect, the utility model provides a fourth 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.

[0013] In combination with the fourth possible implementation of the first aspect, the utility model provides a fifth possible implementation of the first aspect, wherein the inner diameter of the first pipe segment is greater than the inner diameter of the second pipe segment.

[0014] In combination with the first aspect, the utility model provides a sixth possible implementation of the first aspect, wherein a guide portion is provided inside the inner tube, the guide portion is located at the proximal end of the guide wire outlet, and has an inclined surface inclined from the distal end to the proximal end toward the outside of the guide wire outlet.

[0015] In combination with the first aspect, the utility model provides a seventh 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.

[0016] In combination with the first aspect, the utility model provides an eighth 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 to the proximal end;

[0017] 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.

[0018] In combination with the first aspect, the utility model provides a ninth possible implementation of the first aspect, wherein the proximal ends of the outer tube and the inner tube are respectively connected to an operating handle, and the operating handle is used to drive the inner tube to slide relative to the outer tube.

[0019] The embodiments of the present utility model 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 provided on the side wall of the inner tube. The inner tube is inserted into the outer tube, and the outer tube has a relief portion extending towards the distal end to avoid and guide out the guide wire extending out of the guide wire outlet, so that the outer tube and the inner tube can move relative to each other, and the inner tube can push against the stent to be released from the distal end of the outer tube. The length of the guide wire extending towards the proximal end of the inner tube is shortened, rapid exchange can be achieved, the operation time during the operation is shortened, and the guide wire is prevented from being stuck between the outer tube and the inner tube, thereby ensuring that the stent can be successfully released.

[0020] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A partial schematic diagram of the outer tube, inner tube, and guide wire of a rapid exchange stent delivery device provided by an embodiment of the present utility model;

[0023] Figure 2 A distal cross-sectional view of a rapid exchange stent delivery device provided by an embodiment of the present utility model;

[0024] Figure 3 A cross-sectional view of a rapid exchange stent delivery device provided by an embodiment of the present utility model at the guide wire outlet;

[0025] Figure 4 A schematic diagram of the outer tube of a rapid exchange stent delivery device provided by an embodiment of the present utility model;

[0026] Figure 5 A schematic diagram of the outer tube, inner tube, and stent of another rapid exchange stent delivery device provided by an embodiment of the present utility model;

[0027] Figure 6 A cross-sectional view of another rapid exchange stent delivery device provided by an embodiment of the present utility model;

[0028] Figure 7 A schematic diagram of a rapid exchange stent delivery device provided by an embodiment of the present utility model.

[0029] Icons: 100 - outer tube; 011 - tube body section; 012 - flat body section; 013 - first tube section; 014 - opening section; 015 - second tube section; 110 - relief portion; 111 - relief sliding groove; 112 - clearance portion; 113 - notch; 200 - inner tube; 201 - guide wire inlet; 202 - guide wire outlet; 203 - guiding portion; 300 - guiding wire; 400 - stent; 500 - pushing member; 600 - operating handle. Detailed implementation manners

[0030] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. "Distal end" and "proximal end" are referenced with the operating end or a person. The farther end is the "distal end", and the closer end is the "proximal end". In addition, the terms "first", "second", "third" are only used to describe name differences and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specifically marked, should be understood as the basic quantities of the basic units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] Such as Figure 1 、 Figure 2 And Figure 5As shown in the figure, the rapid exchange stent delivery device provided by the embodiment of the present utility model is used to release the stent 400 along the guide wire 300 to the distal end. The delivery device includes: an outer tube 100 and an inner tube 200 inserted inside the outer tube 100; the distal end of the inner tube 200 has a guide wire inlet 201 and a guide wire outlet 202 is provided on the side wall; the outer tube 100 has a relief portion 110 extending towards the distal end, which is used to avoid and lead out the guide wire 300 extending out 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 pushes against the stent 400 to be released from the distal end of the outer tube 100.

[0034] When delivering the stent 400, the outer tube 100 and the inner tube 200 move along the guide wire 300 to the distal end together, so that the stent 400 inside the outer tube 100 is delivered to a predetermined position. When the stent 400 needs to be released, the inner tube 200 pushes the stent 400 relative to the outer tube 100 towards the distal end, so that the stent 400 can be pushed out from the distal end of the outer tube 100, and the released stent 400 can be radially expanded by its own elasticity. When the inner tube 200 moves relative to the outer tube 100 towards the distal end, the guide wire 300 extending out from the guide wire outlet 202 slides along the relief portion 110 towards the distal end, thus avoiding the guide wire 300 being clamped between the outer tube 100 and the inner tube 200, and ensuring the smooth release action of the stent 400. In addition, the guide wire 300 extending out from the guide wire outlet 202 can be led out through the relief portion 110, shortening the length of the guide wire 300 extending towards the proximal end of the outer tube 100, and thus shortening the operation time for exchanging the stent.

[0035] In another embodiment, when delivering the stent 400, the outer tube 100 and the inner tube 200 move along the guide wire 300 to the distal end together, so that the stent 400 inside the outer tube 100 is delivered to a predetermined position. When the stent 400 needs to be released, the outer tube 100 moves relative to the inner tube 200 towards the proximal end, and the inner tube 200 pushes against the stent 400 to be released from the distal end of the outer tube 100, and the released stent 400 can be radially expanded by its own elasticity. When the outer tube 100 moves relative to the inner tube 200 towards the proximal end, the relief portion 110 slides along the guide wire 300 extending out from the guide wire outlet 202 towards the proximal end, thus avoiding the guide wire 300 being clamped between the outer tube 100 and the inner tube 200.

[0036] As Figure 1 and Figure 4 shown in the figure, in the embodiment of the present utility model, the relief portion 110 includes a relief chute 111, and the relief chute 111 is provided on the side wall of the outer tube 100 and extends along the axial direction of the outer tube 100.

[0037] The proximal end position of the chute 111 corresponds to the position of the guide wire outlet 202, and the chute 111 extends distally along the side wall 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 chute 111, thereby ensuring that the inner tube 200 can slide smoothly relative to the outer tube 100.

[0038] 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, so that 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, and 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.

[0039] 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 yielding portion 110 includes: a gap portion 112 located between the first tube segment 013 and the inner tube 200 , and a notch 113 arranged on the opening segment 014 .

[0040] Specifically, the inner diameter of the first tube section 013 is larger than the outer diameter of the inner tube 200, so that a gap portion 112 can be formed between the first tube section 013 and the inner tube 200. The guide wire 300 extending from the guide wire outlet 202 can be led out through the notch 113. When the inner tube 200 moves toward the distal end relative to the outer tube 100 or the outer tube 100 moves toward the proximal end 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 notch 113, so that the inner tube 200 and the outer tube 100 will not slide and get stuck, ensuring that the stent 400 can be released smoothly.

[0041] Furthermore, the proximal end of the opening section 014 is connected to a second tube section 015 sleeved with an inner tube 200, see Figure 5 and Figure 7 The second tube section 015 extends toward the proximal end and is connected to the operating handle 600.

[0042] In an alternative embodiment, a relief groove for the guiding wire 300 to slide may be provided on the side wall of the second pipe section 015. When the inner pipe 200 slides proximally relative to the outer pipe 100, the guiding wire 300 extending from the guide wire outlet 202 slides proximally along the relief groove.

[0043] As Figure 5 and Figure 6 shown, the inner diameter of the first pipe section 013 is larger than that of the second pipe section 015. The second pipe section 015 is in clearance fit with the inner pipe 200, thereby ensuring that the inner pipe 200 can slide smoothly along the outer pipe 100.

[0044] As Figure 3 、 Figure 5 and Figure 6 shown, in an alternative embodiment, a guiding portion 203 is provided inside the inner pipe 200. The guiding portion 203 is located proximally to the guide wire outlet 202 and has an inclined surface that slopes outward from the distal end to the proximal end towards the outside of the guide wire outlet 202.

[0045] The guiding wire 300 enters from the guide wire inlet 201 at the distal end of the inner pipe 200 and extends towards the guide wire outlet 202. The guiding wire 300 extending to the guide wire outlet 202 can be inclined outward along the inclined surface of the guiding portion 203, so that the guiding wire 300 can be smoothly led out.

[0046] See Figure 5 and Figure 6 , the inner pipe 200 is connected with a pushing member 500. The pushing member 500 is inserted inside the outer pipe 100, and the pushing member 500 is used to push the stent 400 to be released from the distal end of the outer pipe 100. When the inner pipe 200 slides distally along the outer pipe 100 or the outer pipe 100 moves proximally relative to the inner pipe 200, the inner pipe 200 drives the pushing member 500 to slide distally, and the stent 400 is pushed to be released from the distal end of the outer pipe 100 through the pushing member 500.

[0047] As Figure 3 and Figure 6 shown, in an alternative embodiment, a relief groove extending proximally is provided on the side wall of the outer pipe 100 starting from the relief portion 110; when the inner pipe 200 slides proximally relative to the outer pipe 100, the guiding wire 300 extending from the guide wire outlet 202 slides proximally along the relief groove.

[0048] As 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 the operating handle 600, and the operating handle 600 is used to drive the inner tube 200 to slide relative to the outer tube 100. Additionally, in an alternative embodiment, the operating handle 600 may further be provided with a snap or threaded locking structure for relatively locking the inner tube 200 and the outer tube 100, unlocking only when releasing the stent 400, and driving the inner tube 200 to slide distally relative to the outer tube 100 through the operating handle 600, thereby releasing the stent 400 from the distal end of the outer tube 100.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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) is provided on 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 quick-exchange stent delivery device according to claim 1, wherein The giving way portion (110) comprises a giving way sliding groove (111), wherein the giving way sliding groove (111) is arranged on the side wall of the outer tube (100) and extends along the axial direction of the outer tube (100).

3. The quick-exchange stent delivery device according to claim 2, wherein, The outer tube (100) comprises: a tube body section (011) and a flat body section (012) connected to the proximal end of the tube body 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) 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 a notch (113) arranged in the opening section (014).

5. The rapid exchange stent delivery device according to claim 4, wherein, The proximal end of the opening section (014) is connected to a second tube section (015) which is sleeved with the inner tube (200).

6. The rapid exchange stent delivery device according to claim 5, wherein, The inner diameter of the first pipe section (013) is greater than the inner diameter of the second pipe section (015).

7. The quick-exchange stent delivery device according to any one of claims 1-6, 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) and has an inclined surface that is inclined from the distal end to the proximal end toward the outside of the guide wire outlet (202).

8. The rapid exchange stent delivery device according to any one of claims 1-6, characterized in that, The inner tube (200) is connected to a push piece (500), the push piece (500) is inserted into the outer tube (100), and the push piece (500) is used to push the stent (400) to be released from the distal end of the outer tube (100).

9. The rapid exchange stent delivery device according to any one of claims 1-6, 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.

10. The rapid exchange stent delivery device according to any one of claims 1-6, 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).

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