Stomach bypass stent locking and releasing device and stent locking and releasing system

Abstract

The invention discloses a gastric bypass stent locking and releasing device and a stent locking and releasing system, and relates to the technical field of medical instruments. The gastric bypass stent locking and releasing device comprises a small releasing ball, a storage tube, an outer tube and a handle. The cylindrical end of the small release ball is inserted into the storage pipe, the end, away from the small release ball, of the storage pipe is connected with the outer pipe, and the outer pipe is connected with the handle. A locking mechanism arranged in the storage tube comprises an unlocking line and a fixing line which are mutually independent and separable, so that the time of surgical operation can be saved, and meanwhile, the risk of surgical failure caused by line breakage when the unlocking line is pulled out is avoided; the release ball is locked and unlocked through the improvement of different knots of the unlocking line and the fixing line; the phenomenon that the unlocking wire is difficult to draw out or cannot be drawn out due to winding, guide wire pressing and the like is avoided; through the use of the three-channel hose, the central channel is not occupied by the unlocking line any more, the implantation difficulty of the product is effectively reduced, the implantation smoothness and accuracy are improved, and stable and efficient operation is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a gastric bypass stent locking and releasing device and a stent locking and releasing system. Background Art

[0002] Endoscopic gastric bypass stent placement is a minimally invasive surgical method used to treat obesity and type 2 diabetes. Its core instrument is a covered stent delivery system. However, this type of system still has certain limitations in actual operation, which affects the efficiency and success rate of the operation. For example, before release, a long unlocking wire must be pulled out to release the lock. This process is time-consuming, and due to the narrow lumen and thin wire body, it is easy to be difficult to extract or even break. In addition, there are many steps before release, which places high demands on the doctor's operational proficiency. For example, the Chinese patent CN109152570A adopts a side hole guide design, which has problems such as insufficient insertion path guidance accuracy and poor operation smoothness in actual application.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The object of the present invention is to provide a gastric bypass stent locking and releasing device and a stent locking and releasing system to solve the above technical problems.

[0005] The present invention is achieved in that: In a first aspect, an embodiment of the present invention provides a gastric bypass stent locking and releasing device, the gastric bypass stent locking and releasing device comprising a release ball, a receiving tube, an outer tube, and a handle; The cylindrical end of the release ball is inserted into one end of the storage tube and is detachably connected to the storage tube; the end of the storage tube away from the release ball is connected to the outer tube, and the outer tube is connected to the handle; A bracket push block and a locking mechanism are provided in the storage tube. The bracket push block is provided at one end away from the release ball and is connected to the release ball. The locking mechanism includes an unlocking line and a fixing line. One end of the unlocking line is connected to one end of the fixing line by a first knot, and the other end of the unlocking line extends and is wound around the handle. The fixing line is close to the unlocking line and is fixedly connected to the release ball by a second knot. The other end of the fixing line extends and is wound around the handle. When the gastric bypass stent locking and releasing device is in a locked state, the release ball is fixed to the end of the storage tube, the second knot is in a locked state and fixedly connected to the release ball, and the second knot is in a locked state, and the unlocking line and the fixing line are independently fixedly connected to the winding part of the handle; When the gastric bypass stent locking and releasing device is in the unlocked state, the unlocking line is separated from the handle, and the first knot and the second knot are independently in the unlocked state, the unlocking line is separated from the fixing line, and the release ball moves in the direction away from the storage tube under the push of external force.

[0006] In a second aspect, an embodiment of the present invention provides a stent locking and releasing system, which includes the aforementioned gastric bypass stent locking and releasing device, a guidewire, and a gastroscope; wherein the guidewire includes a first guidewire and a second guidewire; Under the guidance of the gastroscope, the first guide wire guides the gastric diversion stent locking and releasing device to the designated position; after the gastroscope and the first guide wire are withdrawn, the second guide wire is inserted, and the movement of the gastric diversion stent locking and releasing device is realized under the cooperation and guidance of the second guide wire and the hollow guide through hole of the ball released in the gastric diversion stent locking and releasing device.

[0007] The present invention has the following beneficial effects: The gastric bypass stent locking and releasing device provided in the embodiment of the present invention has the following features: (1) The unlocking line and the fixing line introduced are independent and separable from each other, and are not a whole unlocking line. When unlocking, it is no longer necessary to pull out the entire unlocking line. It is only necessary to pull out the unlocking line until it is separated from the fixing line to unlock the ball. The present invention only requires pulling out 10 cm of the unlocking line, which can save the time of the surgical operation and avoid the risk of surgical failure caused by the line breaking when pulling out the unlocking line, which can effectively improve the efficiency of the surgical operation.

[0008] (2) Two types of knots are introduced. When the part of the second knot fixing the line where one end is located in the third hollow channel is under tension, the second knot will not loosen, and the release ball can be effectively fixed; when the part of the first knot unlocking the line where one end is located in the first hollow channel is under tension, the two knots loosen, and the release ball and the fixing line can be effectively separated; the force value when the first knot is unlocked is greater than the force value when the second knot is unlocked, that is, when the operator unlocks the gastric bypass stent locking and releasing device, as the force value of the unlocking line increases, the second knot loosens first, and after the force value continues to increase, the first knot loosens again, thereby achieving the separation of the release ball and the fixing line.

[0009] (3) Three hollow channels are designed. The unlocking wire, fixing wire and guide wire each have independent channels. The unlocking wire and the fixing wire do not occupy the guide wire channel, and do not need to pass through the gap between the outer tube and the inner tube. When used, it effectively avoids the problem of the unlocking wire being difficult to pull out or unable to be pulled out due to entanglement, guide wire compression, etc.

[0010] (4) The hollow guide hole designed for releasing the ball is connected to the second hollow channel, and enters the digestive tract in a centrally guided manner. The use of a three-channel hose makes the central channel no longer occupied by the unlocking line, effectively reducing the difficulty of product placement, improving the smoothness and accuracy of placement, and achieving stable and efficient surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 A schematic structural diagram of a gastric bypass stent locking and releasing device provided in an embodiment of the present invention; Figure 2 A schematic diagram of the cross-section structure of the locking and releasing device of the gastric bypass stent provided by an embodiment of the present invention in the locked state; Figure 3 for Figure 2 A schematic diagram of the structure of the release ball in the locked state; Figure 4 Schematic diagram of the structure of the first to third hollow channels; Figure 5 This is a schematic structural diagram of a cross-section of a gastric bypass stent locking and releasing device provided by an embodiment of the present invention in an unlocked state.

[0013] Explanation of the reference numerals: 100-gastric diversion stent locking and releasing device; 101-enlarged structural diagram of the release ball in the locked state; 110-release ball; 111-hollow guide hole; 112-center cylinder; 113-second knot; 114-first knot; 120-locking mechanism; 121-unlocking line; 122-fixing line; 130-storage tube; 140-stent push block; 150-first connecting piece; 170-outer tube; 180-guide wire; 190-second connecting piece; 201-enlarged view of the first to third hollow channels; 203-first hollow channel; 205-second hollow channel; 207-third hollow channel; 210-handle; 211-first wire-passing channel of the handle; 212-first fixing piece; 213-second wire-passing channel of the handle; 214-second fixing piece; 230-fixing knob; 250-handle. DETAILED DESCRIPTION

[0014] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0015] In a first aspect, an embodiment of the present invention provides a gastric bypass stent locking and releasing device 100 , which includes a release ball 110 , a receiving tube 130 , an outer tube 170 , and a handle 210 .

[0016] The cylindrical end of the release ball 110 is inserted into one end of the storage tube 130 and is detachably connected to the storage tube 130 ; the end of the storage tube 130 away from the release ball 110 is connected to the outer tube 170 , and the outer tube 170 is connected to the handle 210 .

[0017] A bracket push block 140 and a locking mechanism 120 are provided in the storage tube 130. The bracket push block 140 is arranged away from one end of the release ball 110 and is connected to the release ball 110; the locking mechanism 120 includes an unlocking line 121 and a fixing line 122. One end of the unlocking line 121 is connected to one end of the fixing line 122 through a first knot 114, and the other end of the unlocking line 121 extends and is wrapped around the handle 210; the fixing line 122 is close to the unlocking line 121 and is fixedly connected to the release ball 110 through a second knot 113, and the other end of the fixing line 122 extends and is wrapped around the handle 210.

[0018] When the gastric bypass stent locking and releasing device 100 is in a locked state, the release ball 110 is fixed to the end of the storage tube 130, the second knot 113 is in a locked state and fixedly connected to the release ball 110, the second knot 113 is in a locked state, and the unlocking line 121 and the fixing line 122 are independently fixedly connected to the winding point of the handle 210.

[0019] When the gastric bypass stent locking and releasing device 100 is in the unlocked state, the unlocking line 121 is separated from the handle 210, and the first knot 114 and the second knot 113 are independently in the unlocked state, the unlocking line 121 is separated from the fixing line 122, and the release ball 110 moves in the direction away from the storage tube 130 under the push of external force.

[0020] It should be noted that the connection between the release ball 110 and the storage tube 130 is a clearance fit. When in the locked state, it can be directly assembled manually or with simple tools; when in the unlocked state, the release ball 110 can be directly pushed and moved in the direction away from the storage tube 130 without destroying the other parts.

[0021] The unlocking line 121 and the fixing line 122 introduced in the embodiment of the present invention are of independent and detachable type, and are not the entire unlocking line 121. It is no longer necessary to pull out the entire unlocking line 121 when unlocking, which simplifies the operation steps and reduces the operation time. When unlocking, it is only necessary to pull the unlocking line 121 until it is separated from the fixing line 122 to unlock the release ball 110. The present invention only requires pulling out the unlocking line 121, which can save the time of surgical operation, and at the same time avoids the risk of surgical failure caused by the breakage of the line when extracting the unlocking line 121, which can effectively improve the efficiency of surgical operation.

[0022] When the gastric bypass stent locking and release device 100 is in the locked state, the release ball 110 remains fixed to the end of the storage tube 130 and cannot be separated by external forces. To achieve the locked state, the second knot 113 formed by the fixing line 122 in the embodiment of the present invention is used to wrap around the central cylinder 112 of the release ball 110. Due to the special design of the second knot 113, when tension is applied to the portion of the fixing line 122 located in the third hollow channel 207, that is, when the tension is applied outward along the second wire channel, the second knot 113 will be tightened, facilitating the fit of the release ball 110 and the storage tube 130. The fixing line 122 can then be fixed to the handle 210 via the second fixing member 214.

[0023] In the embodiment of the present invention, when unlocking the release ball 110 in the gastric bypass stent locking and releasing device 100, there is no need to first cut the unlocking line 121 at the handle 250 end, and then pull out all the unlocking lines 121 from the handle 210 end to release the locked state, and then release the coated stent. The operation steps of unlocking the release ball 110 in the embodiment of the present invention are simple, which is conducive to reducing operation time.

[0024] In an optional embodiment, the force value for unlocking the first knot 114 is less than 25 N, the force value for unlocking the second knot 113 is less than 15 N, and the force value for unlocking the first knot 114 is greater than the force value for unlocking the second knot 113 .

[0025] When the force value of the unlocking line 121 near one end of the handle 210 is greater than 15N, the second knot 113 is loosened and force is continuously applied. When the force value of the unlocking line 121 near one end of the handle 210 is greater than 25N, the first knot 114 is loosened to separate the unlocking line 121 and the fixing line 122.

[0026] Specifically, in the present invention, when unlocking the release ball 110 in the gastric bypass stent locking and releasing device 100, the operator first loosens the first fixing member 212 fixed to the end of the first wire channel 211 of the handle, straightens the unlocking wire 121 wrapped around the end of the first wire channel, and applies tension. When the operator pulls the unlocking wire 121 with a force greater than 15N, the second knot 113 is untied first, and the force is continuously applied until the tension on the unlocking wire 121 exceeds 25N. The first knot 114 is then untied, separating the unlocking wire 121 from the fixing wire 122, and the fixing wire 122 from the release ball 110, thereby achieving unlocking.

[0027] In an optional embodiment, the handle 210 includes a first wire passing channel for the unlocking wire 121 to pass through and a second wire passing channel for the fixing wire 122 to pass through; the first wire passing channel and the second wire passing channel are independent of each other, and the first wire passing channel is connected to the first hollow channel 203, and the second wire passing channel is connected to the third hollow channel 207.

[0028] Optionally, the end of the unlocking line 121 away from the first knot 114 extends through the first hollow channel 203 and is wrapped around the end of the first wire channel, and is detachably connected to the first wire channel through the first fixing piece 212; the end of the fixing line 122 away from the second knot 113 extends through the third hollow channel 207 and is wrapped around the end of the second wire channel, and is detachably connected to the second wire channel through the second fixing piece 214.

[0029] It should be noted that in order to ensure that the unlocking line 121 or the fixing line 122 reaches a stable locking state at the handle 210, after they are respectively wrapped around the end of the wire-passing channel, a fixing piece is also provided for fixing. The present invention does not specifically limit the type of connection between the fixing piece and the end of the wire-passing channel. It can be reasonably designed according to actual needs, such as a rotary connection, a press-type connection, and a snap-on connection; specifically, in the embodiment of the present invention, a knob-type connection is used, and the fixing piece is a knob. Specifically, an external thread is provided on the outer side of the end of the wire-passing channel, and an internal thread matching the external thread at the end of the wire-passing channel is provided on the inner side of the knob.

[0030] In an optional embodiment, the first knot 114 is a single knot, and the second knot 113 is a chain-type fixed knot, specifically a chain buckle in this embodiment.

[0031] Two types of knots are introduced in the embodiment of the present invention. When the part of the second knot 113 where one end of the fixing line 122 is located in the third hollow channel 207 is under tension, the second knot 113 will not loosen, and will be locked tighter as the force value increases, thereby achieving effective fixation of the release ball 110; when the part of the first knot 114 where one end of the unlocking line 121 is located in the first hollow channel 203 is under tension, the two knots loosen, which can effectively separate the release ball 110 and the fixing line 122; the force value when the first knot 114 is unlocked is greater than the force value when the second knot 113 is unlocked, that is, when the operator unlocks the gastric bypass stent locking and releasing device 100, as the force value of the unlocking line 121 increases, the second knot 113 loosens first, and after the force value continues to increase, the first knot 114 loosens again, thereby achieving the separation of the release ball 110 and the fixing line 122.

[0032] It should be noted that the first knot 114 is the knot connecting the unlocking line 121 and the fixing line 122. It is a single knot and is located inside the first hollow channel 203 and is arranged near the second knot 113. In the embodiment of the present invention, the original U-shaped unlocking line 121 is changed into a two-section detachable unlocking line 121 and a fixing line 122. When unlocking, it is no longer necessary to pull out the entire unlocking line 121. It is only necessary to pull out the unlocking line 121 until it is separated from the fixing line 122 to achieve the unlocking of the release ball 110, avoiding the risk of breakage of the unlocking line 121 when it is pulled out. The present invention only requires pulling out the unlocking line 121, which effectively saves the time of surgical operation.

[0033] In an optional embodiment, the release ball 110 is provided with a hollow guide hole 111, and a center cylinder 112 is provided at one end of the hollow guide hole 111 close to the storage tube 130; the second knot 113 is fixedly connected to the release ball 110 through the center cylinder 112, and the second knot 113 to the fixed line 122 becomes tighter on one side of the winding end of the handle 210 as the force value increases.

[0034] It should be noted that the hollow guide hole 111 designed for release ball 110 is connected to the second hollow channel 205. It adopts a central guidance method and enters the digestive tract under the guidance of the first diameter. The unlocking wire 121 is located in the separate first hollow channel 203, and the second hollow channel 205 is no longer occupied by the unlocking wire 121. This effectively reduces the difficulty of product insertion, improves the smoothness and accuracy of insertion, and realizes stable and efficient surgery. It effectively avoids the problem of unlocking wire 121 being difficult to remove or unable to be removed due to entanglement or pressure from guidewire 180 during use.

[0035] In an optional embodiment, the gastric bypass stent locking and releasing device 100 further includes a coated stent built into the receiving tube 130 , and the coated stent is mounted on the stent pushing block 140 .

[0036] The front end of the membrane tube of the coated stent is close to the releasing ball 110 and is connected to the releasing ball 110 through a dissolvable inner core.

[0037] It should be noted that the release ball 110 in the embodiment of the present invention is a spherical structure with a cylindrical end at one end. The cylindrical end is used to be inserted into the storage tube 130. The front end of the membrane tube of the stent graft is connected to the cylindrical end of the release ball 110 via a dissolvable inner core, thereby achieving the internalization and sealing of the stent graft within the storage tube 130. In the embodiment of the present invention, the release ball 110 and the storage tube 130 are clearance-fitted. Before the inner core dissolves, the release ball 110 is connected to the stent push block 140 to drive the stent graft on the stent push block 140 to deploy in the human intestine; after the inner core dissolves, the release ball 110 is separated from the stent push block 140.

[0038] In an optional embodiment, the storage tube 130, the outer tube 170 and the handle 210 are respectively and independently provided with a first hollow channel 203 for the unlocking line 121 to pass through, a second hollow channel 205 for the guide wire 180 to pass through and a third hollow channel 207 for the fixing line 122 to pass through in the radial direction.

[0039] The first hollow channel 203 , the second hollow channel 205 and the third hollow channel 207 are independent of each other.

[0040] It should be noted that three hollow channels are designed, and the unlocking line 121, the fixing line 122 and the guide wire 180 each have an independent channel. The unlocking line 121 and the fixing line 122 do not occupy the guide wire 180 channel, which expands the gap between the unlocking line 121 and the guide wire 180. At the same time, it also does not need to occupy the gap between the outer tube 170 and the inner tube. When in use, it effectively avoids the problem of the unlocking line 121 being difficult to pull out or unable to be pulled out due to entanglement, compression by the guide wire 180, etc.

[0041] In an optional embodiment, the second hollow channel 205 is communicated with the hollow guide hole 111 of the release ball 110 for allowing the guide wire 180 to pass through.

[0042] It should be noted that the first guidewire in guidewire 180 is a smaller diameter guidewire. The hollow guide hole 111 of the smaller diameter guidewire release ball 110 cooperates with the second hollow channel 205 to guide the gastric bypass stent locking release device 100 to the designated position. The cooperation method is a clearance fit. The second guidewire is a larger diameter guidewire, which cooperates with the second hollow channel 205. The use of a clearance fit helps to enhance the flexibility of guidewire 180 in the hollow channel and improve its applicability.

[0043] Under the guidance of the gastroscope, the first guidewire guides the gastric diversion stent locking and releasing device 100 to the designated position; after the gastroscope and the first guidewire are withdrawn, the second guidewire is inserted, and the movement of the gastric diversion stent locking and releasing device 100 is realized under the cooperation and guidance of the second guidewire and the hollow guide hole 111 of the release ball 110 in the gastric diversion stent locking and releasing device 100.

[0044] In an optional embodiment, the gastric bypass stent locking and releasing device 100 further includes a connecting piece.

[0045] The housing tube 130 and the outer tube 170 are independently connected to the connectors.

[0046] Optionally, the connection method of the connector is selected from any one of glue bonding, threaded connection and mechanical press-in connection.

[0047] It should be noted that the present invention does not specifically limit the type of connector, and it can be reasonably selected according to actual needs. In the embodiment of the present invention, the connector uses a connecting cap, and the connection method is a threaded connection. The inner side of the connecting cap is provided with an internal thread, and the outer sides of the ends of the receiving tube 130 and the outer tube 170 respectively connected to the connecting cap are independently provided with external threads that match the internal threads of the connecting cap.

[0048] In an optional embodiment, the gastric diversion stent locking and releasing device 100 further includes a guide wire 180, which is used to sequentially pass through the handle 210, the outer tube 170 and the receiving tube 130 until it abuts against the release ball 110 to drive the release ball 110 to move away from the receiving tube 130.

[0049] It should be noted that the handle 250 is provided with an axial hollow channel, the axis of the axial hollow channel is the same as the axis of the second hollow channel 205, and the axial hollow channel is used for guiding the guide wire 180 through and cooperating with the movement of the release ball 110.

[0050] Specifically, when in use, a smaller diameter guide wire can be first inserted into the digestive tract through a gastroscope, and the gastroscope is removed after it reaches the designated position. Then, a larger diameter guide wire is inserted into the second hollow channel 205, and it is passed through the handle 250, the handle 210, the outer tube 170 and the storage tube 130 in sequence until the larger diameter guide wire abuts against the release ball 110 to achieve central guidance.

[0051] In a second aspect, an embodiment of the present invention provides a stent locking and releasing system, which includes the aforementioned gastric bypass stent locking and releasing device 100, a guide wire 180 and a gastroscope; wherein the guide wire 180 includes a first guide wire and a second guide wire.

[0052] Under the guidance of the gastroscope, the first guidewire guides the gastric diversion stent locking and releasing device 100 to the designated position; after the gastroscope and the first guidewire are withdrawn, the second guidewire is inserted, and the movement of the gastric diversion stent locking and releasing device 100 is realized under the cooperation and guidance of the second guidewire and the hollow guide hole 111 of the release ball 110 in the gastric diversion stent locking and releasing device 100.

[0053] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0054] First embodiment Please refer to Figure 1This embodiment provides a gastric bypass stent locking and releasing device 100, which includes a release ball 110, a storage tube 130, a connector, an outer tube 170, a handle 210, a fixing member, a fixing knob 230, and a handle 250, wherein the connector includes a first connector 150 and a second connector 190, and the fixing member includes a first fixing member 212 and a second fixing member 214. The cylindrical end of the release ball 110 is inserted into the end of the storage tube 130, and the end of the storage tube 130 away from the release ball 110 is connected to the outer tube 170 through the first connector 150. The end of the outer tube 170 away from the storage tube 130 is connected to the handle 210 through the second connector 190. The radial outer side of the handle 210 is detachably mounted with a first fixing member 212 and a second fixing member 214, and the end of the handle 210 axially away from the outer tube 170 is connected in sequence with the fixing knob 230 and the handle 250. The specific connection relationship and structural analysis are as follows: Please refer to Figure 3 , an enlarged structural diagram 101 of the release ball in the locked state: the release ball 110 is a spherical structure with a cylindrical end at one end. The cylindrical end is used to insert into the storage tube 130. The front end of the membrane tube of the stent graft is connected to the cylindrical end of the release ball 110 via a dissolvable inner core, so that the stent graft is built into and sealed within the storage tube 130. The release ball 110 and the storage tube 130 are clearance-fitted. Before the inner core dissolves, the release ball 110 is connected to the stent push block 140 to drive the stent graft on the stent push block 140 to deploy in the human intestine; after the inner core dissolves, the release ball 110 is separated from the stent push block 140.

[0055] A hollow guide hole 111 is provided at the center of the release ball 110. A central cylinder 112 is provided at the end of the hollow guide hole 111 near the storage tube 130. A second knot 113 is fixedly connected to the release ball 110 via the central cylinder 112. The end of the second knot 113 near the fixing line 122 extends through the third hollow channel 207 and wraps around the end of the handle's second wire passage 213. A second fixing member 214 is installed at the end of the handle's second wire passage 213 to secure the fixing line 122. The second knot 113 is a chain buckle, a slipknot, and can be untied when the force applied to it exceeds 15N.

[0056] It should be noted that when tension is applied to the portion of the fixing line 122 located in the third hollow channel 207, that is, when the tension is exerted outward along the second wire-passing channel, the second knot 113 will be pulled tighter and tighter, thereby facilitating the release of the ball 110 and the fit between the storage tube 130, and then the fixing line 122 can be fixed to the handle 210 through the second fixing member 214.

[0057] The end of the second knot 113 near the unlocking line 121 is connected to the unlocking line 121 via the first knot 114. The first knot 114 is located inside the first hollow channel 203 near the end of the second knot 113. The unlocking line 121 extends through the first hollow channel 203 and wraps around the end of the first handle wire passage 211. A first fixing member 212 is installed at the end of the handle first wire passage 211 to secure the unlocking line 121. The first knot 114 is a slipknot and can be untied when the force applied to the first knot 114 exceeds 25N.

[0058] Please note that, please refer to Figure 5 , the force value for unlocking the first knot 114 is greater than the force value for unlocking the second knot 113. When unlocking the gastric bypass stent locking and releasing device 100, first, loosen the first fixing piece 212, straighten the unlocking line 121 wrapped around the end of the first wire channel and apply tension. When the operator pulls out the unlocking line 121 with a tension greater than 15N, the second knot 113 will be untied first, and force will continue to be applied. When the tension for pulling out the unlocking line 121 is greater than 25N, the first knot 114 can be untied, and the unlocking line 121 and the fixing line 122 can be separated, that is, unlocking is achieved.

[0059] The unlocking line 121 and the fixing line 122 in this embodiment constitute the locking mechanism 120, which are two independent and detachable lines, not the entire unlocking line 121. When unlocking, it is no longer necessary to pull out the entire unlocking line 121, which simplifies the operation steps and reduces the operation time. When unlocking, it is only necessary to pull the unlocking line 121 until it is separated from the fixing line 122 to unlock the release ball 110. The present invention only requires pulling out the unlocking line 121, which can save surgical operation time and avoid the risk of surgical failure caused by line breakage when extracting the unlocking line 121, which can effectively improve the efficiency of surgical operations.

[0060] Please refer to Figure 2 A stent push block 140 is provided at one end of the storage tube 130 away from the release ball 110. The stent graft is mounted on the stent push block 140, and the stent graft push block 140 is connected to the release ball 110 through the stent graft. Specifically, the stent graft and the release ball 110 are connected through a dissolvable inner core.

[0061] The end of the storage tube 130 away from the bracket push block 140 is connected to the outer tube 170 through the first connecting piece 150. The external thread at the end of the storage tube 130 and the external thread at the end of the outer tube 170 close to the storage tube 130 respectively match the internal thread on the inner side of the first connecting piece 150.

[0062] The end of the outer tube 170 away from the storage tube 130 is connected to the handle 210 through the second connecting piece 190, and the external thread at the end of the outer tube 170 close to the handle 210 and the external thread at the end of the handle 210 close to the outer tube 170 respectively match the internal thread inside the second connecting piece 190.

[0063] In other embodiments of the present invention, the connection method between the first connecting member 150 and the second connecting member 190 can be a snap-on connection or a press-on connection according to actual needs.

[0064] The axial direction of the receiving tube 130, the outer tube 170 and the handle 210 are independently provided with a first hollow channel 203 for the unlocking wire 121 to pass through, a second hollow channel 205 for the guide wire 180 to pass through and a third hollow channel 207 for the fixing wire 122 to pass through. Figure 4 .

[0065] It should be noted that the three hollow channels are independent of each other. Neither the unlocking line 121 nor the fixing line 122 occupies the guide wire 180 channel, and there is no need to pass through the gap between the outer tube 170 and the inner tube. When in use, it effectively avoids the problem of the unlocking line 121 being difficult to pull out or unable to be pulled out due to entanglement or compression by the guide wire 180.

[0066] Specifically, the end of the unlocking line 121 away from the first knot 114 extends through the first hollow channel 203 of the storage tube 130, the outer tube 170 and the handle 210 in sequence and is wrapped around the end of the first wire channel 211 of the handle, and one end of the fixing line 122 extends through the third hollow channel 207 of the storage tube 130, the outer tube 170 and the handle 210 in sequence and is wrapped around the end of the second wire channel 213 of the handle; when released, the first guide wire and the second guide wire independently pass through the handle 250, the fixing knob 230, the handle 210, the outer tube 170 and the second hollow channel 205 of the storage tube 130 from the end of the handle 250 in sequence until they abut against the release ball 110.

[0067] The fixing knob 230 is disposed between the handle 210 and the grip 250 and is independently connected to the handle 210 and the grip 250 using threaded connections. The provision of the fixing knob 230 facilitates adjusting the tightness of the connection between the grip 250 and the grip 210. If the connection is too tight, the guide wire 180 in the second hollow channel 205 will be difficult to insert and remove when released. If the connection is too loose, the handle 250 may fall off. The axes of the fixing knob 230 and the grip 250 are both provided with hollow channels for the guide wire 180 to pass through and cooperate with the movement of the release ball 110.

[0068] The axis of the fixing knob 230 , the axis of the handle 250 , and the axis of the second hollow channel 205 are the same.

[0069] It should be noted that the storage tube 130 is made of hard material, the outer tube 170 is made of soft material, and the three hollow channels provided therein are also made of soft material. The three hollow channels of the handle 210, the fixing knob 230 and the handle 250 are made of hard material, which is convenient for guiding and coordinating the insertion of the guide wire 180.

[0070] In addition, this embodiment also provides a stent locking and releasing system, which includes a gastric diversion stent locking and releasing device 100, a guide wire 180 and a gastroscope; wherein the guide wire 180 includes a first guide wire and a second guide wire; under the guidance of the gastroscope, the first guide wire guides the gastric diversion stent locking and releasing device 100 to the specified position; after the gastroscope and the first guide wire are withdrawn, the second guide wire is inserted, and the hollow guide hole 111 of the ball 110 released in the second guide wire gastric diversion stent locking and releasing device 100 cooperates and guides to realize the movement of the gastric diversion stent locking and releasing device 100.

[0071] In summary, the gastric bypass stent locking and releasing device 100 provided in the embodiment of the present invention includes an unlocking line 121, a fixing line 122, a first knot 114, and a second knot 113, which cooperate with the central cylinder 112 of the release ball 110 to lock and unlock the release ball 110. The working principle is as follows: Please refer to Figure 2 In the locked state, the release ball 110 remains fixed to the end of the storage tube 130, and external forces cannot separate them. To achieve the locked state, the present invention relies on the second knot 113 formed by the fixing line 122 to wrap around the central cylinder 112 of the release ball 110. Due to the special design of the second knot 113, when the fixing line 122 is subjected to tension at one end of the third hollow channel 207, the knot will become tighter and tighter. In other words, applying a certain amount of tension to the fixing line 122 in the second wire channel 213 of the handle can achieve the fit of the release ball 110 and the storage tube 130. The fixing line 122 can then be fixed to the handle 210 by turning the knob.

[0072] The central guidance is achieved because the present invention provides three independent hollow channels at the axes of the release ball 110, the storage tube 130, the outer tube 170, the handle 210, the fixing knob 230 and the handle 250, respectively. The unlocking line 121 and the fixing line 122 each have their own hollow channels and no longer occupy the guide wire 180 channel, effectively avoiding the problem that the unlocking line 121 is difficult to pull out or cannot be pulled out due to entanglement or compression by the guide wire 180.

[0073] Please refer to Figure 5To achieve the unlocked state: First, loosen the first fixing member 212, straighten the unlocking line 121 wrapped around the end of the first wire channel 211 of the handle, and apply tension. When the operator pulls the unlocking line 121 with a tension greater than 15N, the second knot 113 will be untied first. Then, if the operator continues to pull the unlocking line 121 with a tension greater than 25N, the first knot 114 will be untied, separating the unlocking line 121 from the fixing line 122, thus unlocking the system. Under the guidance of a gastroscope, the first guidewire guides the gastric diversion stent locking and releasing device 100 to the designated position; after the gastroscope and the first guidewire are withdrawn, the second guidewire is inserted. Under the cooperation and guidance of the second guidewire and the hollow guide hole 111 of the release ball 110 in the gastric diversion stent locking and releasing device 100, the movement of the gastric diversion stent locking and releasing device 100 is achieved.

[0074] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gastric bypass stent locking and releasing device, characterized in that: The gastric bypass stent locking and releasing device comprises a releasing ball, a receiving tube, an outer tube and a handle; The cylindrical end of the release ball is inserted into one end of the storage tube and is detachably connected to the storage tube; the end of the storage tube away from the release ball is connected to the outer tube, and the outer tube is connected to the handle; A bracket push block and a locking mechanism are provided in the storage tube, wherein the bracket push block is provided at one end away from the release ball and connected to the release ball; the locking mechanism includes an unlocking line and a fixing line, wherein one end of the unlocking line is connected to one end of the fixing line via a first knot, and the other end of the unlocking line extends and is wound around the handle; The fixing line is close to the unlocking line and is fixedly connected to the release ball through a second knot, and the other end of the fixing line extends and is wrapped around the handle; When the gastric bypass stent locking and releasing device is in a locked state, the release ball is fixed to the end of the storage tube, the second knot is in a locked state and fixedly connected to the release ball, and the second knot is in a locked state, and the unlocking line and the fixing line are independently fixedly connected to the winding point of the handle; When the gastric bypass stent locking and releasing device is in the unlocked state, the unlocking line is separated from the handle, and the first knot and the second knot are independently in the unlocked state, the unlocking line is separated from the fixing line, and the release ball moves in the direction away from the storage tube under the push of external force.

2. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The release ball is provided with a hollow guide through-hole, and a central cylinder is provided at one end of the hollow guide through-hole close to the storage tube; the second knot is fixedly connected to the release ball through the central cylinder, and the second knot becomes tighter on the side of the handle winding end of the fixed line as the force value increases; Preferably, the first knot is a single knot, and the second knot is a chain-type fixed knot.

3. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The force required to unlock the first knot is less than 25 N, the force required to unlock the second knot is less than 15 N, and the force required to unlock the first knot is greater than the force required to unlock the second knot; When the force value of the unlocking line close to one end of the handle is greater than 15N, the second knot is loosened and the force is continuously applied. When the force value of the unlocking line close to one end of the handle is greater than 25N, the first knot is loosened, thereby separating the unlocking line from the fixing line and separating the fixing line from the release ball.

4. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The gastric bypass stent locking and releasing device further comprises a coated stent built into the receiving tube, and the coated stent is mounted on the stent pushing block; The front end of the membrane tube of the coated stent is close to the release ball and is connected to the release ball via a dissolvable inner core.

5. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The receiving tube, the outer tube and the handle are independently provided with a first hollow channel for the unlocking wire to pass through, a second hollow channel for the guide wire to pass through and a third hollow channel for the fixing wire to pass through along the radial direction; The first hollow channel, the second hollow channel and the third hollow channel are independent of each other.

6. The gastric bypass stent locking and releasing device according to claim 5, characterized in that: The second hollow channel is communicated with the hollow guide through-hole of the release ball and is used for allowing a guide wire to pass through.

7. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The gastric bypass stent locking and releasing device further comprises a connecting piece; The receiving tube and the outer tube are independently connected to the connecting piece; Preferably, the connection method of the connector is selected from any one of glue bonding, threaded connection and mechanical press-in connection.

8. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The handle includes a first wire-passing channel for the unlocking wire to pass through and a second wire-passing channel for the fixing wire to pass through; the first wire-passing channel and the second wire-passing channel are independent of each other, and the first wire-passing channel is connected to the first hollow channel, and the second wire-passing channel is connected to the third hollow channel; Preferably, one end of the unlocking line away from the first knot extends through the first hollow channel and is wrapped around the end of the first wire passing channel, and is detachably connected to the first wire passing channel through a first fixing piece; one end of the fixing line away from the second knot extends through the third hollow channel and is wrapped around the end of the second wire passing channel, and is detachably connected to the second wire passing channel through a second fixing piece.

9. The gastric bypass stent locking and releasing device according to claim 1, characterized in that: The gastric diversion stent locking and releasing device further comprises a guide wire, which is used to sequentially pass through the handle, the outer tube and the receiving tube until it abuts against the release ball to drive the release ball to move in a direction away from the receiving tube.

10. A bracket locking and releasing system, characterized in that: It comprises the gastric bypass stent locking and releasing device according to any one of claims 1 to 9, a guide wire and a gastroscope; wherein the guide wire comprises a first guide wire and a second guide wire; Under the guidance of the gastroscope, the first guidewire guides the gastric diversion stent locking and releasing device to a designated position; after the gastroscope and the first guidewire are withdrawn, the second guidewire is inserted, and the movement of the gastric diversion stent locking and releasing device is achieved under the cooperation and guidance of the second guidewire and the hollow guide through hole for releasing the ball in the gastric diversion stent locking and releasing device.

Images