Delivery catheter and delivery system

Abstract

The utility model relates to a conveying catheter and a conveying system. The delivery catheter includes: an inner tube; the outer sheath tube is arranged outside the inner tube in a sleeving mode and can move in the axial direction of the inner tube relative to the inner tube, and the outer wall of the inner tube and the inner wall of the outer sheath tube can define a containing space for containing an implant; the guide head is arranged at the far end of the inner tube and is exposed out of the outer sheath tube, and the guide head is made of a macromolecular developing material; wherein a hydrophilic coating is arranged on the outer wall of the outer sheath tube. The hydrophilic coating is arranged on the outer wall of the outer sheath tube, the lubricity of the conveying catheter can be improved through the hydrophilic coating, the resistance of the conveying catheter moving in the human body cavity is reduced, the conveying catheter can move in the human body cavity conveniently, and the operation difficulty is reduced. Meanwhile, due to the fact that the seeker is made of the high polymer material, the whole seeker can be soft, the seeker cannot scratch tissue when moving in the human body cavity, and the target part and the human body cavity are prevented from being damaged.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to a delivery catheter and a delivery system. Background Art

[0002] Ureteral stricture is a kind of urinary system disease. Ureteral stricture may cause obstruction of urine flow, leading to serious diseases such as hydronephrosis, renal function damage, and even renal failure. The causes of ureteral stricture are complex and diverse, and may include congenital anatomical structure abnormalities, infections, traumas, stones, complications after iatrogenic examinations or surgeries, etc. The principle of treating ureteral stricture is to relieve the obstruction in time, drain urine smoothly, and protect renal function.

[0003] Inserting a ureteral stent is one of the current methods to solve ureteral stricture. Usually, a ureteral stent is inserted into the stricture segment of the ureter by using a delivery system to achieve the purpose of treating ureteral stricture. However, the current delivery system has a large resistance when advancing forward in the cystoscope, increasing the surgical difficulty. Moreover, the distal end of the delivery system is relatively hard, which is likely to damage the urinary tract. Summary of the Invention

[0004] Based on this, it is necessary to provide a delivery catheter and a delivery system for the problems that the current delivery system has a large resistance when advancing in the cystoscope and the distal end is hard and likely to damage the urinary tract. The delivery catheter and the delivery system can reduce the resistance when moving in the human body cavity to reduce the surgical difficulty, and at the same time, can prevent the target site and the human body cavity from being damaged during the movement process.

[0005] A delivery catheter includes:

[0006] An inner tube;

[0007] An outer sheath tube sleeved outside the inner tube and capable of moving axially along the inner tube. The outer wall of the inner tube and the inner wall of the outer sheath tube can enclose a receiving space for accommodating an implant; and

[0008] A guiding head provided at the distal end of the inner tube and exposed outside the outer sheath tube. The guiding head is made of a polymer imaging material;

[0009] Wherein, a hydrophilic coating is provided on the outer wall of the outer sheath tube.

[0010] In an embodiment of the present application, the outer sheath tube includes a first tube segment and a second tube segment. The first tube segment is provided at the proximal end of the second tube segment, and the first tube segment is a transparent tube segment, so that the implant in the receiving space can be exposed through the first tube segment;

[0011] The second tube segment is a non-transparent tube segment.

[0012] In one embodiment of the present application, the delivery catheter further includes a first marker ring, which is provided on the first pipe section and located at the proximal end of the implant;

[0013] The color and / or pattern of the first marker ring are different from those of the first pipe section.

[0014] In one embodiment of the present application, the first marker ring and the first pipe section are integrally extruded and formed.

[0015] In one embodiment of the present application, the delivery catheter further includes a second marker ring, which is provided on the outer wall of the inner tube and close to the proximal end of the inner tube;

[0016] The color of the second marker ring is different from that of the second pipe section.

[0017] In one embodiment of the present application, a braided layer is provided inside the outer sheath tube;

[0018] The arrangement density of the braided wires in the first pipe section is less than that in the second pipe section.

[0019] A delivery system includes a delivery handle and the delivery catheter as described in any one of the above technical features. The delivery handle is provided at the proximal end of the delivery catheter, and the delivery handle can control the axial movement of the outer sheath tube along the inner tube.

[0020] In one embodiment of the present application, the delivery handle includes a housing, a pushing member, and a limiting component. The housing is provided at the proximal end of the inner tube. The pushing member is movably provided in the housing and connected to the proximal end of the outer sheath tube. The pushing member can drive the outer sheath tube to move axially relative to the inner tube. The limiting component is provided on the pushing member and can abut against or disengage from the housing to lock or unlock the pushing member.

[0021] In one embodiment of the present application, the limiting component includes a limit switch, an elastic member, and a limiting rod. The limit switch is pressably provided on the pushing member. The elastic member is provided between the limit switch and the pushing member. The limiting rod is provided on the limit switch and can move with the limit switch. The housing has a limiting groove. The elastic force of the elastic member can push the limit switch to drive the limiting rod to move so that the limiting rod is clamped in the limiting groove;

[0022] The number of the limiting grooves is multiple, and the multiple limiting grooves are arranged in sequence along the axial direction of the inner tube.

[0023] In one embodiment of the present application, the delivery handle further includes a first injection joint and a second injection joint. The first injection joint communicates with the inner tube, and the second injection joint communicates with the outer sheath tube.

[0024] After adopting the above technical solution, the present application has at least the following technical effects:

[0025] For the delivery catheter and delivery system of the present application, in the delivery catheter, an outer sheath is sleeved outside the inner tube, and the inner wall of the outer sheath and the outer wall of the inner tube can enclose an accommodation space, and the implant is loaded in the accommodation space in a compressed configuration. A guiding head is provided at the distal end of the inner tube and protrudes from the outer sheath. When the delivery catheter delivers the implant, the distal end of the delivery catheter can move to the target site under the guiding action of the guiding head. Subsequently, the outer sheath is controlled to move proximally along its axis relative to the inner tube to release the implant into the target site, and the implant is supported in the target site in an expanded configuration to achieve the treatment purpose. Moreover, a hydrophilic coating is provided on the outer wall of the outer sheath, and the guiding head is made of a polymer imaging material.

[0026] For the delivery catheter, the implant is placed in the accommodation space between the inner tube and the outer sheath, and the implant is delivered to the target site through the cooperation of the guiding head, the outer sheath and the inner tube. A hydrophilic coating is provided on the outer wall of the outer sheath, and the hydrophilic coating can increase the lubricity of the delivery catheter, reduce the resistance of the delivery catheter moving in the human body cavity, facilitate the movement of the delivery catheter in the human body cavity, and reduce the surgical difficulty. At the same time, since the guiding head is made of a polymer imaging material, the guiding head can be imaged under X-rays without inserting a metal part, and the whole guiding head can be soft. In this way, the guiding head will not scratch the tissue when moving in the human body cavity, avoiding damage to the target site and the human body cavity. Description of the Drawings

[0027] Figure 1 Schematic diagram of loading an implant in the delivery system according to an embodiment of the present application.

[0028] Figure 2 is Figure 1 Schematic diagram of connecting the outer sheath of the delivery system shown to the delivery handle.

[0029] Figure 3 is Figure 1 Schematic diagram of the working state of the delivery system shown.

[0030] Figure 4 is Figure 1 Front view of the delivery handle in the delivery system shown.

[0031] Figure 5 is Figure 4 Top view of the delivery handle shown.

[0032] Figure 6 is Figure 5 Cross-sectional view of the delivery handle shown at A-A.

[0033] Figure 7 The Figure 5 cross-sectional view of the conveying handle shown at B-B.

[0034] Wherein: 10, a conveying system; 100, a conveying catheter; 110, an inner tube; 120, an outer sheath; 121, a hydrophilic coating; 122, a first pipe section; 123, a second pipe section; 130, a guiding head; 140, a first marking ring; 150, a second marking ring; 200, a conveying handle; 210, a housing; 211, a limiting groove; 220, a pushing member; 230, a limiting assembly; 231, a limit switch; 232, an elastic member; 233, a limiting rod; 240, a seal; 250, a first injection joint; 260, a second injection joint; 30, an implant; 40, a cystoscope; 401, a camera. Specific embodiments

[0035] To make the above objects, features, and advantages of the present application more apparent and understandable, the following detailed description of the specific embodiments of the present application will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if there appear these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation of the present application.

[0037] In addition, if there appear these terms "first", "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there appears the term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise clearly defined or limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In this application, unless otherwise clearly defined or limited, if there is a description such as the first feature being "on" or "under" the second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0041] See Figure 1 , this application provides a delivery catheter 100. Figure 1 It is a schematic diagram of loading an implant 30 in a delivery system 10 according to an embodiment of this application. The delivery catheter 100 is applied in the delivery system 10 and is used to deliver the implant 30 of the delivery system 10 to a target site and release it, so that the implant 30 can support the target site, thereby achieving the purpose of treating the target site. Here, the target site refers to the lesion site where the implant 30 needs to be placed. In this embodiment, the target site is the ureter, and the implant 30 is a ureteral stent. After the ureteral stent is implanted into the ureter, it can achieve the purpose of treating ureteral stricture. Of course, in other implementation manners of this application, the target site can also be other types of diseased blood vessels or lesion sites. This embodiment only takes the implant 30 being implanted into the target site as an example for illustration, and moreover, the delivery catheter 100 can move in the human body cavity to deliver the implant 30 to the target site.

[0042] It is understandable that a ureteral stent is usually placed into the stenotic segment of the ureter by using a delivery system to achieve the purpose of treating ureteral stenosis. However, the current delivery system has a relatively large resistance when advancing forward in the cystoscope, which increases the surgical difficulty. Moreover, the distal end of the delivery system is relatively hard and is likely to damage the urinary tract. For this reason, the present application provides a novel delivery catheter 100, which can reduce the resistance during movement in the human body cavity to reduce the surgical difficulty, and can also prevent the target site and the human body cavity from being damaged during the movement. The following introduces the specific structure of the delivery catheter 100 in an embodiment.

[0043] See Figure 1 , in an embodiment, the delivery catheter 100 includes an inner tube 110, an outer sheath tube 120, and a guiding head 130. The outer sheath tube 120 is sleeved outside the inner tube 110 and can move axially along the inner tube 110 relative to the inner tube 110. The outer wall of the inner tube 110 and the inner wall of the outer sheath tube 120 can enclose a receiving space for accommodating the implant 30. The guiding head 130 is provided at the distal end of the inner tube 110 and protrudes from the outer sheath tube 120. The guiding head 130 is made of a polymer material. Among them, a hydrophilic coating 121 is provided on the outer wall of the outer sheath tube 120.

[0044] The inner tube 110 has a proximal end and a distal end which are oppositely arranged. As Figure 1 shown, the left side is the distal end and the right side is the proximal end. The proximal end refers to the end of the inner tube 110 close to the doctor (operator, surgeon), and the distal end refers to the end of the inner tube 110 far from the doctor (operator, surgeon). The inner tube 110 extends from the distal end to the proximal end to form a long tubular shape. The directions of the distal end and the proximal end are also the axial direction of the inner tube 110. It should be noted that the proximal end and the distal end of the inner tube 110 are also applicable to the delivery catheter 100 and other components, and will not be elaborated later.

[0045] The outer sheath tube 120 is movably sleeved outside the inner tube 110. A receiving space is enclosed between the inner wall of the outer sheath tube 120 and the outer wall of the inner tube 110. The implant 30 is loaded in the receiving space. The implant 30 has an expanded configuration and a contracted configuration and can switch between the expanded configuration and the contracted configuration. When the implant 30 is in the contracted configuration, the implant 30 has a smaller volume. At this time, the implant 30 is loaded in the receiving space and is transported to the target site by the delivery catheter 100. When the implant 30 is in the expanded configuration, the volume of the implant 30 increases compared with the contracted configuration. At this time, the implant 30 can support on the inner wall of the target site to achieve the purpose of treatment.

[0046] The implant 30 is loaded in the accommodation space between the inner tube 110 and the outer sheath tube 120 in a compressed configuration. At this time, the inner wall of the outer sheath tube 120 can contact the implant 30 to restrict the expansion of the implant 30. In this way, the volume of the implant 30 can be reduced, facilitating the delivery of the implant 30. Of course, the implant 30 can also be constrained by a binding coil or other restricting components to keep the implant 30 in a compressed configuration. The outer sheath tube 120 can move axially relative to the inner tube 110 to release the implant 30 at the target site. After the delivery catheter 100 transports the implant 30 to the target site, the outer sheath tube 120 moves proximally to release the implant 30. At this time, the implant 30 switches from a contracted configuration to an expanded configuration and gradually expands, enabling the implant 30 to conform to the inner wall of the target site.

[0047] After the release of the implant 30 is completed, the outer sheath tube 120 moves distally, and the outer sheath tube 120 and the inner tube 110 are reset to the initial state to facilitate the removal of the delivery catheter 100 from the human body cavity. It should be noted that after the implant 30 is loaded in the accommodation space, the implant 30 is located at the distal end of the delivery catheter 100. After the distal end of the delivery catheter 100 moves to the target site, the outer sheath tube 120 releases the implant 30 at the distal end to the target site.

[0048] The guide head 130 is provided at the distal end of the inner tube 110, and the guide head 130 protrudes from the outer sheath tube 120. The distal end of the outer sheath tube 120 contacts the proximal end of the guide head 130. The guide head 130 can play a role in guiding the movement. The guide head 130 is a TIP head. After the delivery catheter 100 is inserted into the human body cavity, the guide head 130 can play a role in guiding the movement in the human body cavity, facilitating the movement of the distal end of the delivery catheter 100 in the human body cavity, and thus facilitating the delivery of the implant 30 to the target site.

[0049] To further facilitate the movement of the delivery catheter 100 in the human body cavity, a hydrophilic coating 121 is provided on the outer wall of the outer sheath tube 120 in this application. The hydrophilic coating 121 has good lubricating performance after being activated by water. Therefore, through the lubricating effect of the hydrophilic coating 121, it is convenient for the delivery catheter 100 to move in the human body cavity, reducing the resistance during the movement of the delivery catheter 100, facilitating the movement of the delivery catheter 100 to the target site, and reducing the surgical difficulty.

[0050] Moreover, the guide head 130 is made of a polymer imaging material. In this way, the guide head 130 can be in a relatively soft structural form as a whole and be imaged under X-rays. In this way, when the delivery catheter 100 moves in the human body cavity, the relatively soft guide head 130 is not likely to damage the human body cavity and the tissues of the target site, ensuring the safety during the delivery process of the delivery catheter 100 and minimizing the patient's access as much as possible.

[0051] For the delivery catheter 100 of the above embodiments, an implant 30 is placed in the accommodation space between the inner tube 110 and the outer sheath tube 120, and the implant 30 is delivered to the target site through the cooperation of the guide head 130, the outer sheath tube 120 and the inner tube 110. A hydrophilic coating 121 is provided on the outer wall of the outer sheath tube 120. The hydrophilic coating 121 can increase the lubricity of the delivery catheter 100, reduce the resistance of the delivery catheter 100 moving in the human body cavity, facilitate the movement of the delivery catheter 100 in the human body cavity, and reduce the surgical difficulty. At the same time, since the guide head 130 is made of a polymer material, the whole guide head 130 can be made soft. In this way, the guide head 130 will not scratch the tissue when moving in the human body cavity, avoiding damage to the target site and the human body cavity.

[0052] Optionally, the hydrophilic coating 121 is provided on the outer wall of the outer sheath tube 120 by coating. Of course, in other embodiments of the present application, the hydrophilic coating 121 can also be provided on the outer wall of the outer sheath tube 120 by means of coating or the like, that is, the hydrophilic coating 121 is the outer layer of the outer sheath tube 120. Optionally, the guide head 130 is made of polyether block polyamide (Pebax) material. Of course, in other embodiments of the present application, the guide head 130 can also be made of polyethylene (PE) or other types of polymer materials.

[0053] See Figures 1 to 3 , in one embodiment, the outer sheath tube 120 includes a first tube section 122 and a second tube section 123. The first tube section 122 is provided at the proximal end of the second tube section 123, and the first tube section 122 is a transparent tube section, so that the first tube section 122 can expose the implant 30 in the accommodation space. Figure 2 For Figure 1 the schematic diagram of the connection between the outer sheath tube 120 and the delivery handle 200 in the delivery system 10 shown in Figure 3 For Figure 1 the schematic diagram of the working state of the delivery system 10 shown in

[0054] The first tube section 122 is located at the distal end, the second tube section 123 is located at the proximal end, the proximal end of the first tube section 122 is connected to the distal end of the second tube section 123, the distal end of the first tube section 122 extends in a direction away from the second tube section 123, and the proximal end of the second tube section 123 is connected to the delivery handle 200. In this way, the first tube section 122 and the second tube section 123 form the integral outer sheath tube 120. The first tube section 122 and the second tube section 123 are sleeved outside the inner tube 110, and the inner wall of the first tube section 122 and the outer wall of the inner tube 110 enclose an accommodation space to accommodate the implant 30.

[0055] Moreover, there is a certain distance between the inner wall of the second pipe section 123 and the outer wall of the inner pipe 110, so as to facilitate the movement of the outer sheath pipe 120 relative to the inner pipe 110 and facilitate the release of the implant 30. At the same time, the first pipe section 122 is a transparent pipe section. After the implant 30 is loaded into the accommodation space, the doctor can see the internal implant 30 and the position where the implant 30 is located through the transparent first pipe section 122. When the delivery catheter 100 moves to the target site, the position of the end of the implant 30 can be observed through the transparent first pipe section 122, and the doctor can release the implant 30 according to the patient's condition to release the implant 30 at the desired position.

[0056] In one embodiment, the second pipe section 123 is an opaque pipe section. That is to say, the first pipe section 122 is transparent and the second pipe section 123 is opaque. In this way, it is convenient for the doctor to identify the first pipe section 122 and the second pipe section 123, and then it is convenient to determine the position of the implant 30, so as to determine the position of the delivery catheter 100 in the human body cavity, so that the proximal end of the delivery catheter 100 can accurately move to the target site.

[0057] See Figures 1 to 3 , in one embodiment, the delivery catheter 100 further includes a first marking ring 140, and the first marking ring 140 is arranged on the first pipe section 122 and is located at the proximal end of the implant 30. The first marking ring 140 is arranged on the outer wall of the outer sheath pipe 120 and is arranged close to the distal end of the outer sheath pipe 120. Further, the first marking ring 140 is arranged on the outer wall of the first pipe section 122 to correspond to the proximal end of the implant 30, and the position of the proximal end of the implant 30 corresponding to the outer sheath pipe 120 is marked by the first marking ring 140.

[0058] It can be understood that the proximal end of the implant 30 is the starting point of the high radial force. The first marking ring 140 corresponds to the position of the proximal end of the implant 30. In this way, the position of the first marking ring 140 can be observed through a cystoscope 40 or the like, and then the position of the starting point of the high radial force of the implant 30 at the target site can be judged according to the position of the first marking ring 140. In this way, the doctor can release the implant 30 according to the patient's condition to release the implant 30 at the desired position to ensure the treatment effect.

[0059] In one embodiment, the first marking ring 140 and the first pipe section 122 are integrally extruded and formed. That is to say, the first marking ring 140 and the outer sheath pipe 120 are of an integral structure, and the two are processed by an integral molding method. In this way, the first marking ring 140 is not easy to break away from the outer wall of the outer sheath pipe 120, and when the delivery catheter 100 passes through the cystoscope 40, the first marking ring 140 is not easy to be scraped off by the cystoscope 40, realizing the clear positioning of the implant 30.

[0060] In one embodiment, the color and / or pattern of the first marking ring 140 is different from that of the first pipe section 122. That is to say, the first marking ring 140 is in a non-transparent structural form. In this way, the doctor can clearly judge the difference between the first marking ring 140 and the first pipe section 122, so as to clearly know the position of the first marking ring 140 on the first pipe section 122, so as to determine the proximal position of the implant 30.

[0061] Optionally, the first marking ring 140 is black. Of course, in other embodiments of the present application, the first marking ring 140 can also be yellow, blue or other colors. Moreover, the first marking ring 140 can also be marked with a special pattern, such as a diagonal line type, etc., as long as it can facilitate the doctor to identify the difference between the first marking ring 140 and the second pipe section 123.

[0062] See Figure 1 and Figure 3 In one embodiment, the delivery catheter 100 further includes a second marking ring 150. The second marking ring 150 is provided on the outer wall of the inner tube 110 and near the proximal end of the inner tube 110. The color of the second marking ring 150 is different from that of the second pipe section 123. The second marking ring 150 is used to mark the position of the inner tube 110, so as to judge the position of the inner tube 110 and the second pipe section 123.

[0063] The distal end of the cystoscope 40 has a camera 401. When the delivery catheter 100 passes through the cystoscope 40 and extends into the target site, when there is an obvious color difference between the second marking ring 150 and the second pipe section 123 in the image transmitted by the camera 401, it indicates that the first pipe section 122 is exposed outside the cystoscope 40, and the distal end of the second pipe section 123 is exposed outside the cystoscope 40, which further indicates that the implant 30 is completely exposed outside the cystoscope 40.

[0064] Exemplarily, the second marking ring 150 is yellow and the second pipe section 123 is blue. The implant 30 is loaded between the inner tube 110 and the outer sheath 120. The yellow second marking ring 150 is exposed through the transparent first pipe section 122, and the blue second pipe section 123 is exposed. There is an obvious color difference between the second marking ring 150 and the second pipe section 123. After the delivery catheter 100 passes through the cystoscope 40 and extends out, the yellow first marking ring 140 is first exposed outside the cystoscope 40. Subsequently, when the blue second pipe section 123 is exposed outside the cystoscope 40, that is, when it transitions from yellow to blue, it can indicate that the stent is completely exposed outside the cystoscope 40.

[0065] Of course, in other embodiments of the present application, the second marking ring 150 and the second pipe section 123 may also exhibit other different color differences, such as red and blue, etc. Moreover, the second marking ring 150 and the second pipe section 123 may also be marked with different patterns, as long as it is convenient for doctors to identify the differences between the second marking ring 150 and the second pipe section 123.

[0066] In one embodiment, a braided layer is provided inside the outer sheath tube 120. The braided layer is woven from braided wires. The braided layer can improve the radial support force, anti-bending property, pushability and other properties of the outer sheath tube 120 to ensure the structural strength of the outer sheath tube 120, thereby ensuring the use performance of the delivery catheter 100.

[0067] In one embodiment, the arrangement density of the braided wires in the first pipe section 122 is less than the arrangement density of the braided wires in the second pipe section 123. That is to say, the arrangement of the braided wires in the braided layer in the first pipe section 122 is relatively sparse. In this way, the braided layer is not easy to block the line of sight, so that the first pipe section 122 is a transparent pipe section, which is convenient for seeing the internal implant 30 and the second marking ring 150 clearly. At the same time, since the implant 30 is loaded inside the first pipe section 122, the implant 30 can support the first pipe section 122, and even if the arrangement density of the braided wires in the first pipe section 122 is relatively sparse, it will not affect the anti-bending performance of the first pipe section 122. Moreover, the arrangement of the braided wires in the braided layer in the second pipe section 123 is relatively dense, which further improves the radial support force, anti-bending property, pushability and other properties of the second pipe section 123.

[0068] Moreover, by adjusting the density of the braided wires, the radial support force, anti-bending property, pushability and other properties of the outer sheath tube 120 are improved. At the same time, the wall thickness of the outer sheath tube 120 can be reduced while keeping the outer diameter of the outer sheath tube 120 unchanged, so that the inner diameter of the outer sheath tube 120 can be increased. In this way, the loading space for the implant 30 between the outer sheath tube 120 and the inner tube 110 is larger. When the implant 30 is released, the frictional resistance can be reduced, and the release of the implant 30 is facilitated.

[0069] In one embodiment, the guide head 130 is a radiopaque member. That is to say, a radiopaque material, such as barium sulfate, etc., is added to the guide head 130. In this way, the guide head 130 can be radiographed, so as to accurately position the guide head 130 in the human body cavity through the ray radiation, and ensure that the proximal end of the delivery catheter 100 is accurately moved to the target site.

[0070] When the delivery catheter 100 of the present application delivers the implant 30 to a target site such as the ureter, the implant 30 is loaded between the inner tube 110 and the outer sheath tube 120. The delivery catheter 100 and the cystoscope 40 are assembled together and moved through the urethra and bladder to the ureteral orifice, and then the cystoscope 40 stops moving. Subsequently, the delivery catheter 100 moves through the cystoscope 40 into the ureter, and the moving position of the delivery catheter 100 is monitored through the camera 401 at the distal end of the cystoscope 40. When a significant color difference appears in the image transmitted from the camera 401, that is, a color difference appears between the second marker ring 150 and the second tube section 123, such as a transition from yellow to blue, it indicates that the implant 30 is completely exposed outside the cystoscope 40, and the current exit of the cystoscope 40 is just the proximal position of the implant 30. The doctor can release the implant 30 according to the patient's condition.

[0071] For the delivery catheter 100, the implant 30 is placed in the accommodation space between the inner tube 110 and the outer sheath tube 120, and the implant 30 is delivered to the target site through the cooperation of the guiding head 130, the outer sheath tube 120 and the inner tube 110. A hydrophilic coating 121 is provided on the outer wall of the outer sheath tube 120. The hydrophilic coating 121 can increase the lubricity of the delivery catheter 100, reduce the resistance of the delivery catheter 100 moving in the human body cavity and the frictional resistance in the cystoscope, and facilitate the movement of the delivery catheter 100 in the human body cavity to reduce the surgical difficulty. At the same time, since the guiding head 130 is made of a polymer material, the guiding head 130 can be made soft as a whole. In this way, the guiding head 130 will not scratch the tissue when moving in the human body cavity, avoiding damage to the target site and the human body cavity.

[0072] Moreover, the second marker ring 150 and the second tube section 123 can form a visual difference, and the delivery catheter 100 has a good visual effect in cooperation with the cystoscope 40, which is beneficial to judging the position of the implant 30 during the operation. In addition, the wall of the outer sheath tube 120 is thinner and the inner cavity is larger, and the resistance of the delivery catheter 100 to release the implant 30 is small, which is beneficial for the doctor to release the implant 30. And the first marker ring 140 and the outer sheath tube 120 are integrally formed, so that the first marker ring 140 is not easily detached, so as to mark the starting point of the high radial force on the implant 30.

[0073] See Figure 1 and Figure 3 In addition, the present application also provides a delivery system 10, including a delivery handle 200 and the delivery catheter 100 as described in any of the above embodiments. The delivery handle 200 is provided at the proximal end of the delivery catheter 100, and the delivery handle 200 can control the axial movement of the outer sheath tube 120 along the inner tube 110. In this embodiment, the delivery handle 200 is provided at the proximal end of the delivery catheter 100 and is connected to the proximal end of the outer sheath tube 120. The delivery handle 200 can control the axial movement of the delivery catheter 100 to realize the release of the implant 30.

[0074] Moreover, after the delivery system 10 of the present application adopts the delivery catheter 100 of the above embodiment, the resistance of the delivery catheter 100 moving in the human body cavity can be reduced, facilitating the movement of the delivery catheter 100 in the human body cavity, reducing the surgical difficulty, and avoiding damage to the target site and the human body cavity.

[0075] See Figure 1 、 Figures 4 to 7 , in an embodiment, the delivery handle 200 includes a housing 210, a pushing member 220, and a limiting assembly 230. The housing 210 is disposed at the proximal end of the inner tube 110. The pushing member 220 is movably disposed in the housing 210 and is connected to the proximal end of the outer sheath 120. The pushing member 220 can drive the outer sheath 120 to move axially relative to the inner tube 110. The limiting assembly 230 is disposed on the pushing member 220 and can abut against or disengage from the housing 210 to lock or unlock the pushing member 220. Figure 4 For Figure 1 the front view of the delivery handle 200 in the delivery system 10 shown in Figure 5 For Figure 4 the top view of the delivery handle 200 shown in Figure 6 For Figure 5 the cross-sectional view of the delivery handle 200 at A - A shown in Figure 7 For Figure 5 the cross-sectional view of the delivery handle 200 at B - B shown in

[0076] The housing 210 is the installation housing of the delivery handle 200. The housing 210 is disposed at the proximal end of the inner tube 110. The pushing member 220 is the operating component of the delivery handle 200. The pushing member 220 is connected to the proximal end of the outer sheath 120. The pushing member 220 is movably disposed in the housing 210. When the pushing member 220 is operated, the pushing member 220 can move relative to the housing 210 to drive the outer sheath 120 to move axially along the inner tube 110 to realize the loading or release of the implant 30. Optionally, the pushing member 220 is a push block or other structural forms that are convenient for operation. Moreover, the doctor's thumb can press the pushing member 220 to drive the pushing member 220 to move axially.

[0077] To prevent the implant 30 from being released due to accidental contact with the pusher 220, the delivery handle 200 of the present application further includes a limiting component 230. The limiting component 230 is disposed in the housing 210 and is connected to the pushing portion. The limiting component 230 can lock or unlock the pusher 220. When it is necessary to release the implant 30, the limiting component 230 unlocks the pusher 220. At this time, when the pusher 220 is operated, the pusher 220 can drive the outer sheath 120 to move axially relative to the inner tube 110. When the delivery catheter 100 moves in the human body cavity, the limiting component 230 locks the pusher 220 to the inner tube 110 to limit the movement of the outer sheath 120 relative to the inner tube 110 and avoid accidental release of the implant 30.

[0078] See Figure 1 、 Figures 4 to 7 In one embodiment, the limiting component 230 includes a limit switch 231, an elastic member 232, and a limit rod 233. The limit switch 231 is pressably disposed on the pusher 220. The elastic member 232 is disposed between the limit switch 231 and the pusher 220. The limit rod 233 is disposed on the limit switch 231 and can move with the limit switch 231. The housing 210 has a limit groove 211. The elastic force of the elastic member 232 can push the limit switch 231 to drive the limit rod 233 to move so that the limit rod 233 is stuck in the limit groove 211.

[0079] In the non-pressurized state, the elastic member 232 pushes up the limit switch 231 upward (as shown in Figure 6 and Figure 7 ). The limit switch 231 drives the limit rod 233 to be placed in the limit groove 211. The limit groove 211 can catch and limit the limit rod 233 to axially limit the limit rod 233, and the pusher 220 cannot move axially. When the limit switch 231 is pressed, the limit switch 231 overcomes the elastic force of the elastic member 232 and drives the limit rod 233 to disengage from the limit groove 211. At this time, the pusher 220 can be moved axially to load or release the implant 30. Optionally, the elastic member 232 is a spring, an elastic column, etc.

[0080] In one embodiment, the number of the limit grooves 211 is multiple, and the multiple limit grooves 211 are arranged in sequence along the axial direction of the inner tube 110. In this way, axial limiting of the limit rod 233 at multiple positions can be achieved to meet the requirements for loading and releasing the implant 30. In one embodiment, the delivery handle 200 further includes a seal 240. The seal 240 is disposed between the pusher 220 and the inner tube 110. In this way, the seal 240 can seal the pusher 220 and the inner tube 110 to prevent liquid leakage. Optionally, the seal 240 is a sealing ring, etc.

[0081] See Figures 4 to 6, in one embodiment, the delivery handle 200 further includes a first injection connector 250 and a second injection connector 260. The first injection connector 250 is in communication with the inner tube 110, and the second injection connector 260 is in communication with the outer sheath 120. It is provided that the first injection connector 250 can inject liquids such as normal saline into the inner tube 110, and the second injection connector 260 can inject liquids such as normal saline into the outer sheath 120. When the liquid is injected into the outer sheath 120 through the second injection connector 260, the liquid will flow into the outer sheath 120, thereby playing a role of wetting and lubricating the implant 30, which is beneficial to the release of the stent.

[0082] When the delivery system 10 of the present application is in use, after pressing the limit switch 231, the limit rod 233 disengages from the limit groove 211. The operating pusher 220 is moved proximally to load the implant 30 between the inner tube 110 and the outer sheath 120. The operating pusher 220 is moved distally to reset the outer sheath 120. Subsequently, the delivery system 10 is cooperated with the cystoscope 40 to deliver the proximal end of the delivery catheter 100 to the target site. After pressing the limit switch 231, the limit rod 233 disengages from the limit groove 211. The operating pusher 220 is moved proximally to release the implant 30 at the target position. After the release is completed, the outer sheath 120 is reset, and the delivery catheter 100 is withdrawn from the human body cavity.

[0083] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0084] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A delivery catheter, characterized in that: include: Inner tube; an outer sheath tube, which is sleeved outside the inner tube and can move relative to the inner tube along the axial direction of the inner tube, and the outer wall of the inner tube and the inner wall of the outer sheath tube can enclose a receiving space for receiving the implant; and A guide head is arranged at the distal end of the inner tube and exposed from the outer sheath tube, and the guide head is made of a polymer developing material; Wherein, the outer wall of the outer sheath tube is provided with a hydrophilic coating.

2. The delivery catheter according to claim 1, characterized in that: The outer sheath comprises a first tube segment and a second tube segment, the first tube segment is arranged at the proximal end of the second tube segment, and the first tube segment is a transparent tube segment, so that the first tube segment can expose the implant in the accommodating space; The second tube section is a non-transparent tube section.

3. The delivery catheter according to claim 2, characterized in that: The delivery catheter further comprises a first marker ring, which is arranged on the first tube segment and located at the proximal end of the implant; The color and / or pattern of the first marker ring is different from that of the first tube section.

4. The delivery catheter according to claim 3, characterized in that: The first marking ring and the first pipe section are extruded integrally.

5. The delivery catheter according to claim 2, characterized in that: The delivery catheter further comprises a second marker ring, which is arranged on the outer wall of the inner tube and close to the proximal end of the inner tube; The second marker ring has a color different from that of the second tube segment.

6. The delivery catheter according to claim 2, characterized in that: The inner part of the outer sheath tube is provided with a braided layer; The arrangement density of the braided wires in the first tube section is smaller than the arrangement density of the braided wires in the second tube section.

7. A conveying system, characterized in that: It comprises a delivery handle and a delivery catheter as claimed in any one of claims 1 to 6, wherein the delivery handle is arranged at the proximal end of the delivery catheter, and the delivery handle can control the axial movement of the outer sheath tube along the inner tube.

8. The conveying system according to claim 7, characterized in that The delivery handle includes an outer shell, a pushing member and a limiting assembly. The outer shell is arranged at the proximal end of the inner tube. The pushing member is movably arranged in the outer shell and connected to the proximal end of the outer sheath tube. The pushing member can drive the outer sheath tube to move axially relative to the inner tube. The limiting assembly is arranged on the pushing member and can abut or disengage from the outer shell to lock or unlock the pushing member.

9. The conveying system according to claim 8, characterized in that The limit assembly includes a limit switch, an elastic member and a limit rod, the limit switch can be pressed and arranged on the push member, the elastic member is arranged between the limit switch and the push member, the limit rod is arranged on the limit switch and can move with the limit switch, the housing has a limit groove, the elastic force of the elastic member can push the limit switch to drive the limit rod to move, so that the limit rod is clamped in the limit groove; There are multiple limiting grooves, and the multiple limiting grooves are arranged in sequence along the axial direction of the inner tube.

10. The conveying system according to any one of claims 7 to 9, characterized in that: The delivery handle also includes a first injection connector and a second injection connector, wherein the first injection connector is connected to the inner tube, and the second injection connector is connected to the outer sheath tube.

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