A delivery system for a stent

Abstract

The present application relates to the technical field of medical devices, in particular to a release body and a covered stent delivery system. The release body is used for guiding the deployment of a membrane tube in the covered stent delivery system. The release body comprises a plurality of sheath bodies, a shaping member and a connecting member. The plurality of sheath bodies are arranged around the shaping member to form a fixed sheath with a mounting hole. The fixed sheath comprises a distal end and a proximal end. The mounting hole is located at the proximal end and extends towards the distal end. The connecting member is fixed in the mounting hole and used for connecting the membrane tube. The distal end of the membrane tube is connected to the connecting member. The release body drives the membrane tube to deploy by pushing the fixed sheath. The deployment is timely, which avoids blocking the stent release channel and facilitates the release of the stent. When the membrane tube is deployed, the connecting member is disconnected from the distal end of the membrane tube, and then the release body is separated from the membrane tube. The release body can be discharged out of the body, which avoids affecting the food passing through the membrane tube and effectively ensures the function of the membrane tube.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a release body and a covered stent delivery system. BACKGROUND

[0002] The current stent weight loss product mainly places an instrument on the small intestine (duodenum) to block the mixing of chyme with pancreatic and bile duct juice and intestinal juice, so that the chyme passing through the small intestine is not digested and absorbed, and the human body will greatly reduce the nutrients absorbed from food, thereby achieving the purpose of weight loss. However, after the stent with a membrane tube is implanted in the human body, the unfolding of the membrane tube mainly relies on the peristalsis of the human body tissue to realize, and the membrane tube is not unfolded in time, and at the same time, it is easy to accumulate around the stent, resulting in blockage of the stent channel and failure of the stent to release. SUMMARY

[0003] The purpose of the present application is to provide a release body and a covered stent delivery system to solve the technical problem that the unfolding of the membrane tube mainly relies on the peristalsis of the human body tissue to realize after the stent with a membrane tube is implanted in the human body, the membrane tube is not unfolded in time, and at the same time, it is easy to accumulate around the stent, resulting in blockage of the stent channel and failure of the stent to release.

[0004] The present application provides a release body for guiding the unfolding of a membrane tube in a covered stent delivery system, the release body comprising: a plurality of sheath bodies, a shaping member and a connecting member;

[0005] The plurality of sheath bodies are surrounded by the shaping member to form a fixed sheath with a mounting hole, the fixed sheath comprising a distal end and a proximal end, the mounting hole being located at the proximal end and extending towards the distal end;

[0006] The connecting member is fixed in the mounting hole for connecting the membrane tube.

[0007] As a further technical solution, a winding member is provided on the fixed sheath, and the winding member is located in the mounting hole.

[0008] As a further technical solution, a threading hole is provided on the connecting member.

[0009] The winding member is arranged on one side of the connecting member facing the distal end.

[0010] As a further technical solution, a buckle structure is provided on the outer wall of the fixed sheath, and the buckle structure is located at the proximal end.

[0011] As a further technical solution, the buckle structure comprises a clasp, and the clasp is sleeved on the fixed sheath.

[0012] A plurality of clamping portions are provided on the clasp.

[0013] As a further technical solution, the buckle structure further comprises an annular mounting groove, and the clasp ring is fixed in the mounting groove.

[0014] As a further technical solution, the clasp part is made of nickel-titanium alloy material.

[0015] As a further technical solution, the shaping piece comprises an end cap, the end cap is connected to the fixed sheath through a connecting structure, and is located at the distal end.

[0016] As a further technical solution, the connecting structure comprises a first thread and a second thread matched with each other.

[0017] The first thread is arranged on the inner side wall of the end cap, and the second thread is arranged on the outer side wall of the fixed sheath.

[0018] As a further technical solution, a limiting groove arranged in the mounting hole is further included, and the connecting piece is fixed in the mounting hole through the limiting groove.

[0019] As a further technical solution, a guide through hole for threading a guide wire is further included.

[0020] As a further technical solution, a space is arranged between the guide through hole and the mounting hole.

[0021] As a further technical solution, the sheath body is provided with two, which are an upper half sheath body and a lower half sheath body.

[0022] The upper half sheath body is provided with a limiting column, the lower half sheath body is provided with a limiting hole, and the limiting column is inserted into the limiting hole.

[0023] As a further technical solution, the connecting piece is connected with the film tube through a dissolvable film.

[0024] The present application provides a film-covered stent delivery system, which comprises the release body.

[0025] Compared with the prior art, the release body and the film-covered stent delivery system provided by the present application have the following technical advantages:

[0026] The release body provided by the present application is used for guiding the film tube in the film-covered stent delivery system to be unfolded, and the release body comprises a plurality of sheath bodies, a shaping piece and a connecting piece; the plurality of sheath bodies are surrounded by the shaping piece to form a fixed sheath with a mounting hole, the fixed sheath comprises a distal end and a proximal end, the mounting hole is located at the proximal end and extends towards the distal end; the connecting piece is fixed in the mounting hole and used for connecting the film tube.

[0027] When the release body is assembled, the distal end of the membrane tube is first wrapped on the connecting piece, then the connecting piece is installed on a sheath body, and then a plurality of sheath bodies are arranged to form a fixed sheath, so that the connecting piece is fixed in the mounting hole, and the membrane tube is connected with the connecting piece, at this time, the shaping piece is installed on the plurality of fixed sheaths, so that the fixed sheaths are kept in a fixed shape, and the structure is simple and the assembly is convenient. When the membrane tube needs to be unfolded, the fixed sheath is pushed to drive the release body to unfold the membrane tube, when the membrane tube is unfolded, a force greater than the force for pushing the fixed sheath is applied or the peristalsis of the human body tissue is used to make the connecting piece and the distal end of the membrane tube in a disconnected state, and then the release body and the membrane tube are separated, so that the membrane tube and the release body are completely and conveniently separated. At the same time, the stent with the membrane tube is implanted in the human body, the membrane tube is guided to unfold by the release body, the membrane tube is unfolded in time, the stent release channel is prevented from being blocked, the release of the stent is facilitated, the release body and the membrane tube are separated through the connecting piece, so that the release body can be discharged out of the body, the food passing through the membrane tube is avoided, and the function of the membrane tube is effectively ensured.

[0028] The stent delivery system provided by the application comprises the release body, and therefore has the technical advantages and effects of the release body, which will not be described in detail here.

[0029] Other features and advantages of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The release body fixed by the pull wire provided by the embodiment of the application is shown in the exploded view;

[0032] Figure 2 The release body fixed by the pull wire provided by the embodiment of the application is shown in the structural schematic view;

[0033] Figure 3 The release body fixed by the pull wire provided by the embodiment of the application is shown in the structural schematic view;

[0034] Figure 4 The clasp structure schematic view provided by the embodiment of the application is shown in the structural schematic view;

[0035] Figure 5 The upper half sheath body structure schematic view provided by the embodiment of the application is shown in the structural schematic view;

[0036] Figure 6A lower half sheath structure schematic diagram provided by the embodiment of the present application;

[0037] Figure 7 An explosion view of the release body fixed by the snap ring provided by the embodiment of the present application.

[0038] Icon: 1-release body; 2-upper half sheath; 3-lower half sheath; 4-connector; 5-mounting hole; 6-winding post; 7-threading hole; 8-snap ring; 9-clamping part; 10-mounting groove; 11-end cover; 12-first thread; 13-second thread; 14-limiting groove; 15-guiding through hole; 16-limiting column; 17-limiting hole; 18-jack. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0040] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connection” should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it 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.

[0042] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

[0043] The present application will be described in further detail below through specific embodiments and in conjunction with the drawings.

[0044] The specific structure is shown in Figures 1 to 7 .

[0045] The embodiment provides a releasing body 1 for guiding the expansion of a membrane tube in a covered stent delivery system, the releasing body 1 comprising: a plurality of sheath bodies, a shaping piece and a connecting piece 4; the plurality of sheath bodies are surrounded by the shaping piece to form a fixed sheath with a mounting hole 5, the fixed sheath comprises a distal end and a proximal end, the mounting hole 5 is located at the proximal end and extends towards the distal end; and the connecting piece 4 is fixed in the mounting hole 5 and used for connecting the membrane tube.

[0046] In the embodiment, the proximal end of the fixed sheath is the end close to the operator, and the distal end is the end away from the operator. The connecting piece 4 can be in a sheet shape, a column shape or a block shape, as long as it is convenient to be fixed in the mounting hole 5 and convenient to be connected with the membrane tube. Meanwhile, the releasing body 1 is in a spherical shape as a whole, which is convenient for the releasing body 1 to be discharged out of the body and avoids scratching the human body tissue.

[0047] When the releasing body is assembled, the distal end of the membrane tube is covered on the connecting piece 4, the connecting piece 4 is installed on one sheath body, and then the plurality of sheath bodies are surrounded to form the fixed sheath, so that the connecting piece 4 is fixed in the mounting hole 5, and the membrane tube is located between the connecting piece 4 and the inner wall of the fixed sheath and is fixed by being squeezed between the connecting piece 4 and the inner wall of the fixed sheath. At this time, the shaping piece is installed on the plurality of fixed sheaths, so that the fixed sheaths remain in a fixed shape, and the structure is simple and the assembly is convenient. When the membrane tube needs to be expanded, the fixed sheath is pushed to drive the releasing body 1 to expand the membrane tube. When the membrane tube is expanded, a force greater than the force for pushing the fixed sheath is applied or the peristalsis of the human body tissue is used to make the connecting piece 4 and the distal end of the membrane tube in a disconnection state, so that the releasing body 1 and the membrane tube are separated. The membrane tube and the releasing body 1 are completely and conveniently separated. Meanwhile, the stent with the membrane tube is implanted in the human body, the membrane tube is guided to expand by the releasing body 1, the membrane tube is expanded in time, the stent release channel is prevented from being blocked, the release of the stent is facilitated, the releasing body 1 and the membrane tube are conveniently separated through the connection of the connecting piece 4 and the membrane tube, so that the releasing body 1 can be discharged out of the body, the food passing through the membrane tube is avoided, and the function of the membrane tube is effectively ensured.

[0048] In the embodiment, the distal end of the membrane tube and the connecting piece 4 can also be connected through a dissolvable film. The dissolvable film is arranged at the distal end of the membrane tube and connected with the connecting piece 4. Since the dissolvable film is connected with the connecting piece 4 and located in the mounting hole 5, and the membrane tube is expanded for a short time, when the digestive juice enters the mounting hole 5, the membrane tube has been expanded. At this time, the dissolvable film is dissolved to separate the connecting piece 4 from the membrane tube, so that the releasing body 1 and the membrane tube are separated. The connection is convenient, and the membrane tube and the connecting piece are easily disconnected.

[0049] In an optional technical solution of the embodiment, the fixing sheath is provided with a winding member, and the winding member is located in the mounting hole 5. The film-coated stent conveying system comprises a pushing device, a pull wire, a stent, a film tube, and a guide wire. The pushing device comprises a receiving tube, a connecting tube, a hollow handle, a fixing knob, an outer tube, a handle, a luer cap, a stop block, a pull wire knob, a hollow rod, and a connecting cap. The proximal end of the receiving tube is connected with the connecting cap. The connecting cap is connected to the hollow handle through the connecting tube. The hollow handle is connected with the fixing knob and a pull wire channel. The pull wire channel is provided with the pull wire knob. One end of the outer tube passes through the fixing knob and is arranged in the hollow handle. The other end of the outer tube is connected with the handle. The handle is provided with the luer cap. The stop block is arranged on the outer tube and located between the handle and the fixing knob. The proximal end of the film tube is connected to the stent. When the release body 1 is assembled, the distal end of the film tube is connected to the connecting piece 4 in the release body 1. Meanwhile, one end of the pull wire passes through the pull wire channel, the handle, the connecting tube, the receiving tube, the stent, and the film tube in sequence, and then is inserted into the mounting hole 5 and wound on the winding member. Then, the pull wire is passed back through the receiving tube, the film tube, the stent, the connecting tube, the handle, and the pull wire channel to form a closed loop with the other end of the pull wire, and is fixed by the pull rope knob. The film tube and the stent are contracted to the minimum diameter state. The hollow rod is inserted into the film tube and the stent to reserve a channel for the guide wire and the pull wire. The hollow rod is finally taken out at the end close to the connecting cap of the receiving tube after the assembly is completed, only leaving a hollow channel. The release body 1, the film tube, and the stent are fixed together with the receiving tube by the pull wire. The release body 1 is fixed by cooperation of the pull wire and the winding member. The structure is simple, the fixing effect is good, and the release body 1 can be guided to expand the film tube by pulling out the pull wire only by damaging the closed loop structure of the pull wire.

[0050] In the embodiment, the winding member can be a winding column 6, a winding ring, or a winding hole, etc. In the preferred embodiment, the winding member is a winding column 6, which is simple in structure, easy to manufacture, and good in fixing effect after winding.

[0051] In an optional technical solution of the embodiment, the winding member can be arranged on the side of the connecting piece 4 facing the proximal end, and the pull wire can be directly wound on the winding member. Alternatively, the winding member can be arranged on the side of the connecting piece 4 facing the distal end, and the pull wire is wound on the winding member after passing through the connecting piece 4. Since the winding member is located on the side of the connecting piece 4 facing the distal end, the guide wire pushing the release body 1 and the distal end of the film tube to connect with the connecting piece 4 is not affected.

[0052] In the preferred embodiment, the connecting piece 4 is in the form of a sheet, and a threading hole 7 is formed in the connecting piece 4. One end of the pull wire passes through the threading hole 7 of the connecting piece 4 and is wound on the winding member. In this way, the threading of the pull wire is convenient, and the linear relative friction between the pull wire and the connecting piece 4 is small when the release body 1 is fixed, so as to avoid breakage of the pull wire.

[0053] In an optional technical solution of the embodiment, the outer side wall of the fixed sheath is provided with a buckle structure, and the buckle structure is located at the proximal end. The fixed sheath is detachably connected with the receiving tube through the buckle structure, so that the release body 1 is fixed above the receiving tube conveniently and stably. The buckle structure includes a clamping groove provided on the receiving tube and a clamping block provided on the fixed sheath, or a clamping groove provided on the fixed sheath and a clamping block provided on the receiving tube, or a clamping groove provided on the receiving tube and a spring ball provided on the fixed sheath, or a clamping groove provided on the fixed sheath and a spring ball provided on the receiving tube. In this way, the buckle structure is simple in structure, convenient to manufacture, good in fixing effect, and convenient to detach.

[0054] Preferably, in the embodiment, the buckle structure includes a clamping ring 8, and the clamping ring 8 is sleeved on the fixed sheath. A plurality of clamping portions 9 are provided on the clamping ring 8. The clamping portions 9 can be provided in two, and the two clamping portions 9 are symmetrically arranged. The buckle structure further includes a positioning hole provided on the receiving tube. The clamping portions 9 and the positioning hole cooperate to fix the release body 1 and the receiving tube. The clamping ring 8 is convenient to manufacture, and is convenient to fix with the fixed sheath. Meanwhile, the clamping portions 9 and the positioning hole are convenient to detach.

[0055] Further, the buckle structure further includes an annular mounting groove 10, and the clamping ring 8 is fixed in the mounting groove 10. The mounting groove 10 is provided with a receiving portion at a position corresponding to the clamping portion 9. The receiving portion is used to receive the clamping portion 9. The clamping ring 8 is convenient to fix, simple in structure, and convenient to manufacture. Meanwhile, the clamping ring 8 is located below or flush with the groove plane of the mounting groove 10, which is beautiful in structure and prevents the clamping ring 8 from affecting the movement of the release body 1. Meanwhile, the clamping ring 8 is fixed firmly.

[0056] In an optional technical solution of the embodiment, the clamping portion 9 is made of nickel-titanium alloy material. Nickel-titanium alloy is a memory metal. The clamping portion 9 can be changed between the clamping state and the decoupling state by changing the temperature, so as to be conveniently fixed with or separated from the positioning hole. Preferably, the clamping ring 8 is integrally made of nickel-titanium alloy material, which is integrally formed, convenient to manufacture, and cost-saving.

[0057] In an optional technical solution of the embodiment, the shaping member includes an end cover 11. The end cover 11 is connected to the fixed sheath through a connecting structure and is located at the distal end. A plurality of sheath bodies are shaped by the end cover 11, which is simple in structure and good in shaping effect.

[0058] Specifically, the connecting structure can be a ring groove provided on the inner wall of the end cover 11 and a ring rib provided on the outer side wall of the fixed sheath. The ring rib and the ring groove cooperate to realize the connection between the end cover 11 and the fixed sheath. The connecting structure can also be a groove provided on the inner wall of the end cover 11 and a protrusion provided on the outer side wall of the fixed sheath. The groove and the protrusion cooperate to realize the connection between the end cover 11 and the fixed sheath. The connecting structure is not limited to this, and can also be other structures capable of connecting the end cover 11 and the fixed sheath to each other.

[0059] The first thread 12 is arranged on the inner side wall of the end cap 11, and the second thread 13 is arranged on the outer side wall of the fixed sheath. The end cap 11 is connected with the fixed sheath by cooperation of the first thread 12 and the second thread 13, and the structure is simple and convenient to connect.

[0060] In an optional technical solution of the embodiment, the shaping member includes a shaping ring belt, the shaping ring belt is elastic and sleeved on the plurality of sheath bodies, the plurality of sheath bodies are combined into the fixed sheath by the elastic fixing of the shaping ring belt, the fixed sheath has a spherical external shape, and the outer wall of the fixed sheath is provided with an annular groove, the shaping ring belt is installed in the annular groove and is flush with the groove mouth of the annular groove, which facilitates installation of the shaping ring belt and makes the outer wall of the fixed sheath smooth to avoid scratching human tissues, and the structure is beautiful.

[0061] In an optional technical solution of the embodiment, when the plurality of sheath bodies are surrounded by the shaping member to form the fixed sheath, the adjacent sheath bodies abut each other, so that when the connecting member 4 is separated from the membrane tube, the shaping member can still keep the fixed sheath in shape, that is, the shape of the entire release body 1 is unchanged.

[0062] In an optional technical solution of the embodiment, the limiting groove 14 arranged in the mounting hole 5 is further included, and the connecting member 4 is fixed in the mounting hole 5 through the limiting groove 14. Preferably, the connecting member 4 is in a sheet shape and is square, the structure is simple and convenient to manufacture, the connecting member 4 is installed in the limiting groove 14, the plurality of sheath bodies limit the radial movement of the connecting member 4 along the axial line of the fixed sheath, and the limiting groove 14 limits the axial movement of the connecting member 4 along the axial line of the fixed sheath, so that the structure is simple and the connecting member 4 is fixed stably.

[0063] In an optional technical solution of the embodiment, the guide through hole 15 for penetrating the guide wire is further included. The release body 1 is conveniently guided into the human body through the guide wire.

[0064] Specifically, the covered stent delivery system is used in the body of a patient first, and then a gastroscope is inserted into the duodenum. The soft head of the guide wire is inserted into the duodenum through the gastroscope channel. The guide wire is kept stationary, and the gastroscope is withdrawn. The release body 1 is inserted into the guide wire through the guide hole 15, and the release body 1 and the storage tube are guided and delivered to the duodenum along the guide wire. At the same time, the gastroscope is inserted into the body to guide the passage. When the storage tube reaches the designated position, the guide wire is pulled out, the luer cap is opened, and the support part of the guide wire is inserted along the tail hole until it reaches the release body 1. At this time, the pull wire is cut off by opening the pull wire knob, and the release body 1 is disconnected from the storage tube. The release body 1 is moved in the human intestinal tract by the guide wire, so that the membrane tube connected to the connecting piece 4 moves together. When the membrane tube reaches the designated position, the release body 1 is separated from the connecting piece 4 by using the guide wire to exert a force greater than the force for moving the release body 1 in the human intestinal tract, and then the guide wire is pulled out. At this time, the membrane tube has been successfully deployed through the guidance of the release body 1. The stent can be pushed out of the storage tube by the push handle, and the implantation of the stent is successfully achieved.

[0065] In this embodiment, the release body 1 and the storage tube are connected by a buckle structure. The release body 1 is separated from the storage tube by the pushing force of the guide wire, which is simple, convenient and easy to operate. When the buckle structure is a snap ring 8 and a positioning hole, and the clamping part 9 is made of nickel-titanium alloy, the release body 1 can be separated from the storage tube by changing the temperature to change the clamping part 9 from the clamping state to the decoupling state. With the help of the pushing force of the guide wire, the release body 1 can be separated from the storage tube, which is simple, convenient and stable.

[0066] In the optional technical solution of this embodiment, a space is provided between the guide hole 15 and the mounting hole 5. When the release body 1 is inserted into the guide wire through the guide hole 15, the guide wire is prevented from entering the mounting hole 5, thereby affecting the stability of the release body 1.

[0067] In the optional technical solution of this embodiment, the sheath body is provided with two, which are the upper half sheath body 2 and the lower half sheath body 3. The structure is simple, and it is convenient to fix the fixed sheath by the shaped part. The upper half sheath body 2 is provided with a limiting column 16, and the lower half sheath body 3 is provided with a limiting hole 17. The limiting column 16 is inserted into the limiting hole 17. It is convenient to assemble the upper half sheath body 2 and the lower half sheath body 3 to form a fixed sheath. When the fixed sheath is connected with the end cover 11, the radial movement of the upper half sheath body 2 and the lower half sheath body 3 relative to the axis of the limiting column 16 is prevented, which is convenient for the fixation between the fixed sheath and the end cover 11, and increases the stability of the overall structure.

[0068] The lower half sheath body 3 is provided with a winding column 6, and the upper half sheath body 2 is provided with a insertion hole 18 for inserting the winding column 6, which is convenient for assembling the upper half sheath body 2 and the lower half sheath body 3, and improves the stability. At the same time, the upper half sheath body 2 and the lower half sheath body 3 are each provided with a guide groove. When the upper half sheath body 2 and the lower half sheath body 3 are buckled, the guide grooves of each are buckled to form a guide hole 15. The structure is simple and easy to manufacture.

[0069] In this embodiment, the release body 1 can be made of materials that can be digested and absorbed by the human intestinal tract or dissolved, or other materials, and is discharged outside when excreted by the human body.

[0070] The stent graft delivery system provided in this embodiment comprises the release body 1 described above, and thus the technical advantages and effects achieved by the stent graft delivery system include those achieved by the release body 1 described above, which will not be described here again.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part 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 application.

Claims

1. A release body for guiding the unfolding of a membrane tube in a covered stent delivery system, characterized in that, The release body (1) includes: multiple sheaths, shaping parts and connecting parts (4); Multiple sheaths are arranged by the shaping member to form a fixed sheath having a mounting hole (5), the fixed sheath having a distal end and a proximal end, the mounting hole (5) being located at the proximal end and extending toward the distal end; The connector (4) is fixed in the mounting hole (5) and is used to connect the membrane tube; The fixed sheath is provided with a winding component, which is located inside the mounting hole (5); It also includes a guide hole (15) for threading the guide wire. The sheath is provided in two parts, namely an upper sheath (2) and a lower sheath (3). The upper sheath (2) is provided with a limiting post (16), and the lower sheath (3) is provided with a limiting hole (17). The limiting post (16) is inserted into the limiting hole (17). The connector (4) has a thread hole (7); The winding member is disposed on the side of the connector (4) facing the distal end; The shaping component includes an end cap (11), which is connected to the fixed sheath via a connecting structure and is located at the distal end; The connection structure includes a first thread (12) and a second thread (13) that cooperate with each other. The first thread (12) is provided on the inner side wall of the end cap (11), and the second thread (13) is provided on the outer side wall of the fixed sheath.

2. The release agent according to claim 1, characterized in that, A snap-fit ​​structure is provided on the outer wall of the fixing sheath, and the snap-fit ​​structure is located at the proximal end.

3. The release agent according to claim 2, characterized in that, The buckle structure includes a retaining ring (8), which is sleeved on the fixing sheath; The retaining ring (8) is provided with multiple retaining parts (9).

4. The release agent according to claim 3, characterized in that, The buckle structure also includes an annular mounting groove (10), and the retaining ring (8) is fixed in the mounting groove (10).

5. The release agent according to claim 3, characterized in that, The snap-fit ​​part (9) is made of nickel-titanium alloy.

6. The release agent according to any one of claims 1-5, characterized in that, It also includes a limiting groove (14) provided in the mounting hole (5), and the connector (4) is fixed in the mounting hole (5) through the limiting groove (14).

7. The release agent according to claim 1, characterized in that, There is a gap between the guide hole (15) and the mounting hole (5).

8. The release agent according to any one of claims 1-5, characterized in that, The connector (4) is connected to the membrane tube via a soluble membrane.

9. A film-coated stent delivery system, characterized in that, Includes the release agent (1) as described in any one of claims 1-8.

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