Urethral stent implantation device

Abstract

The utility model relates to the technical field of medical instruments, in particular to a urethral stent implantation device. The imbedding device comprises a core tube, an inner tube, an outer tube, a safety rope, a core tube seat, an inner tube seat, an outer tube seat, a safety rope seat and a displacement locking mechanism, the displacement locking mechanism comprises a rotating shaft, an elastic body and a main body part, and the rotating shaft can be movably connected with the core tube seat, the inner tube seat and the safety rope seat. One end, in the axial direction, of the elastic body abuts against the closed end of the first blind hole of the main body part, the other end of the elastic body can stretch out of the first blind hole to abut against the inner walls of the core tube seat, the inner tube seat and the safety rope seat, and the main body part can be connected with the outer tube seat, the inner tube seat and the core tube seat in a clamped mode. By means of the displacement locking mechanism, an operator can achieve locking simply and conveniently by pushing the inner pipe base or the inner core pipe base or the safety rope base by hand, the situation that the operator achieves locking and unlocking in a continuous rotating mode is avoided, and the beneficial effects of being easy and convenient to operate are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a urethral stent placement device. Background Art

[0002] Urethral stent (or prostate stent) implantation has made great progress in my country in recent years. The commonly used clinical method is to place a urethral stent at the urethral stricture to expand the urethral stricture or blockage.

[0003] The urethral stent is generally made of stainless steel, synthetic fiber silicone or nickel-titanium alloy. The urethral stent can be placed in the urethral stenosis through the insertion device, so that the originally narrow and closed urethra can be expanded, and then most patients with dysuria can restore urination function after the urethral stent is placed. The current urethral stent insertion device includes an inner tube, an outer tube and a core tube, the inner tube and the outer tube are sequentially sleeved on the outer periphery of the core tube, the outer tube provides a channel for interventional surgery, the inner tube and the core tube cooperate to transport and insert the urethral stent into the body, the urethral stent is sleeved on the outer periphery of the core tube, and after reaching the urethral stenosis position, the urethral stent is inserted in different ways for urethral stents of different materials. After the urethral stent is inserted, the inner tube, the outer tube and the core tube are withdrawn. The existing inner tube, the outer tube and the core tube are connected by an interface spiral connection to achieve mutual position adjustment. Although the spiral connection has the advantage of simple structure, the operator needs to rotate the thread continuously during the spiral connection process, which has the problems of cumbersome operation and inconvenient use.

[0004] Therefore, there is an urgent need for a urethral stent placement device that is simple to operate and convenient. Utility Model Content

[0005] The purpose of the present application is to provide a urethral stent placement device that is simple and convenient to operate.

[0006] The embodiments of the present application can be implemented through the following technical solutions:

[0007] A urethral stent placement device comprises a core tube, an inner tube, an outer tube, a safety rope, a core tube seat, an inner tube seat, an outer tube seat and a safety rope seat, wherein the core tube is sleeved on the outer circumference of the safety rope and can be displaced along the axial direction of the safety rope, the inner tube is sleeved on the outer circumference of the core tube and can be displaced along the axial direction of the core tube, the outer tube is sleeved on the outer circumference of the inner tube and can be displaced along the axial direction of the inner tube, and the safety rope seat, the core tube seat, the inner tube seat and the outer tube seat are respectively connected to the proximal ends of the safety rope, the core tube, the inner tube and the outer tube.

[0008] It also includes a plurality of displacement locking mechanisms, which are arranged between the safety rope seat and the core tube seat, between the core tube seat and the inner tube seat, and between the inner tube seat and the outer tube seat;

[0009] The displacement locking mechanism includes a rotating shaft, an elastic body and a main body. The main body is provided with a first through hole, and the rotating shaft can be accommodated in the first through hole and movably connected with the core tube seat, the inner tube seat and the safety rope seat through the first through hole; the main body is provided with a first blind hole, and the elastic body can be accommodated in the first blind hole. One end of the elastic body along the axial direction thereof abuts against the closed end of the first blind hole, and the other end can extend out of the first blind hole and abut against the inner walls of the core tube seat, the inner tube seat and the safety rope seat respectively. The main body can be respectively engaged and connected with the outer tube seat, the inner tube seat and the core tube seat.

[0010] Furthermore, the inner tube seat, the core tube seat, and the safety rope seat are respectively provided with a second through hole cooperating with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

[0011] Furthermore, the outer tube seat, the inner tube seat, and the core tube seat all include a first matching portion, the first matching portion is arranged toward the proximal end, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the core tube, and the main body portion can form a locking state with the first matching portion during the displacement process.

[0012] Preferably, the first matching portion is a plate-shaped structure, and a zigzag track matching with the main body is provided on the end surface thereof facing the main body.

[0013] Furthermore, the slope of the zigzag track is arranged toward the proximal end.

[0014] Preferably, the safety rope is provided with a flat portion, and a limiting portion cooperating with the flat portion is provided in the channel of the safety rope seat for accommodating the safety rope.

[0015] Preferably, the distal end of the core tube is provided with a barb-type structure, and the proximal end of the barb-type structure can abut against the distal end of the urethral stent.

[0016] Furthermore, the length of the core tube is greater than the length of the inner tube.

[0017] Furthermore, a liquid outlet connected to a pipeline of the core tube is provided at the distal end of the core tube.

[0018] Furthermore, a liquid injection channel is arranged on the outer periphery of the inner tube seat.

[0019] The urethral stent placement device provided in the embodiments of the present application has at least the following beneficial effects:

[0020] (1) The present application uses a displacement locking mechanism, and the operator can easily lock the inner tube seat, the inner tube seat or the safety rope seat by hand, avoiding the operator to lock and unlock by continuous rotation, and has the advantages of simple and convenient operation.

[0021] (2) When the main body in the present application is displaced along the axial direction of the core tube, the main body can rotate around the rotation axis, and at the same time, the elastomer can squeeze the main body under its own elastic action to achieve the movement and recovery of the main body along the axial direction of the elastomer, and automatic locking can be achieved during the displacement process.

[0022] (3) The main body in the present application can cooperate with the zigzag track of the first matching part so that the main body can be locked at different positions of the zigzag track to achieve graded locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an overall structural diagram of a urethral stent placement device in the present application;

[0024] Figure 2 This is an overall structural diagram of a urethral stent placement device connected to a urethral stent in the present application;

[0025] Figure 3 An exploded view of a urethral stent placement device and a urethral stent connected in the present application;

[0026] Figure 4 This is an overall structural diagram of the connection between the outer tube seat and the displacement locking mechanism in this application;

[0027] Figure 5 This is an overall structural diagram of the connection between the inner tube seat and the displacement locking mechanism in this application;

[0028] Figure 6 This is an overall structural diagram of the connection between the inner core tube seat and the displacement locking mechanism in this application;

[0029] Figure 7 This is the overall structural diagram of the safety rope seat in this application;

[0030] Figure 8 An exploded view of the displacement locking mechanism in this application;

[0031] Fig. 9 This is the overall structural diagram of the main body of this application;

[0032] Fig.10 This is an overall structural diagram of the main body of the present application from another angle;

[0033] Fig.11 This is the overall structural diagram of the safety rope seat in this application from another angle;

[0034] Fig.12 for Figure 1 A partial enlarged view of area A.

[0035] Figure numerals: 0, urethral stent, 1, outer tube, 2, outer tube seat, 3, inner tube, 4, inner tube seat, 41, injection channel, 5, core tube, 51, barb-type structure, 52, liquid outlet, 6, core tube seat, 7, safety rope, 8, safety rope seat, 9, displacement locking mechanism, 91, rotating shaft, 92, elastomer, 93, main body, 931, first through hole, 932, first blind hole, 10, second through hole, 11, first matching part, 12, first connecting part, 13, second matching part, 14, first hand-held part, 15, third matching part, 16, third through hole, 17, recessed part, 18, second hand-held part. DETAILED DESCRIPTION

[0036] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0037] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. Unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0038] In addition, in the description of the embodiments of the present application, various components on the drawings are enlarged or reduced in size for ease of understanding, but this practice is not intended to limit the scope of protection of the present application.

[0039] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present application are further explained below in conjunction with the accompanying drawings and through specific implementation methods. For the convenience of description, the following description uses the terms "proximal end" and "distal end", where "proximal end" refers to the end close to the operator and "distal end" refers to the end far away from the operator and deep into the body.

[0040] The present application provides a urethral stent placement device, which is used to deliver and place a urethral stent into the body, and then withdraw the placement device after the urethral stent placement is completed.

[0041] Specifically, Figure 1 , Figure 2 and Figure 3 The overall structure diagram and the exploded diagram of the insertion device and the connection between the insertion device and the urethral stent 0 in the present application are shown respectively. Figure 1-Figure 3As shown, the insertion device includes an outer tube 1, an outer tube seat 2, an inner tube 3, an inner tube seat 4, a core tube 5, a core tube seat 6, a safety rope 7 and a safety rope seat 8, wherein the outer tube 1 is used to provide a transportation channel for the inner tube 3, the core tube 5 and the safety rope 7, the inner tube 3 and the core tube 5 can cooperate to realize the transportation and insertion of the urethral stent 0, the safety rope 7 can prevent the urethral stent 0 from accidentally falling off during the transportation process, and the outer tube seat 2, the inner tube seat 4, the core tube seat 6 and the safety rope seat 8 are used to connect with other devices to respectively realize the position movement and locking of the outer tube 1, the inner tube 3, the core tube 5 and the safety rope 7.

[0042] Furthermore, the core tube 5 is sleeved on the outer circumference of the safety rope 7 and can be displaced along the axial direction of the safety rope 7, the inner tube 3 is sleeved on the outer circumference of the core tube 5 and can be displaced along the axial direction of the core tube 5, and the outer tube 1 is sleeved on the outer circumference of the inner tube 3 and can be displaced along the axial direction of the inner tube 3, that is, the outer circumference of the safety rope 7 is sequentially sleeved with the core tube 5, the inner tube 3 and the outer tube 1.

[0043] Further, the safety rope seat 8, the core tube seat 6, the inner tube seat 4 and the outer tube seat 2 are respectively connected to the proximal ends of the safety rope 7, the core tube 5, the inner tube 3 and the outer tube 1.

[0044] It is conceivable that the safety rope seat 8, the core tube seat 6, the inner tube seat 4 and the outer tube seat 2 can be connected to the safety rope 7, the core tube 5, the inner tube 3 and the outer tube 1 respectively by gluing, welding, fixed connection, integral molding, etc. No matter which method is used, as long as a stable connection can be achieved.

[0045] Furthermore, the existing safety rope seat 8, core tube seat 6, inner tube seat 4 and outer tube seat 2 are usually connected to other devices by setting threads. During the interventional surgery, the operator needs to turn them in circles, which is inconvenient to use and cumbersome to operate. Therefore, the insertion device in the present application replaces the traditional threaded connection method with a displacement locking mechanism 9.

[0046] Specifically, there are multiple displacement locking mechanisms 9, and stable connection is achieved by arranging the displacement locking mechanisms 9 between different seats.

[0047] In some specific embodiments of the present application, Figure 2 and Figure 3 As shown, the number of the displacement locking mechanisms 9 is 3. It is conceivable that in practical production, the number of the displacement locking mechanisms 9 can be adjusted according to actual needs.

[0048] Specifically, the displacement locking mechanism 9 is arranged between the safety rope seat 8 and the core tube seat 6, between the core tube seat 6 and the inner tube seat 4, and between the inner tube seat 4 and the outer tube seat 2. Figure 2 and Figure 3As shown, the connection structures among the safety rope seat 8, the core tube seat 6, the inner tube seat 4, and the outer tube seat 2 are all displacement locking mechanisms 9. It is conceivable that one displacement locking mechanism 9 and two spiral connection structures, or two displacement locking mechanisms 9 and one spiral connection structure can also be provided.

[0049] Specifically, Figure 4-Figure 10 As shown, the displacement locking mechanism 9 includes a rotating shaft 91, an elastic body 92 and a main body 93. The main body 93 is provided with a first through hole 931. The rotating shaft 91 can be accommodated in the first through hole 931 and movably connected with the core tube seat 6, the inner tube seat 4 and the safety rope seat 8 through the first through hole 931; the main body 93 is provided with a first blind hole 932. The elastic body 92 can be accommodated in the first blind hole 932. One end of the elastic body 92 along its axial direction abuts against the closed end of the first blind hole 932, and the other end can extend out of the first blind hole 932 to abut against the inner walls of the core tube seat 6, the inner tube seat 4 and the safety rope seat 8 respectively. The main body 93 can rotate around the rotating shaft 91 while realizing the snap connection with the outer tube seat 2, the inner tube seat 4 and the core tube seat 6, so as to realize the automatic locking of the outer tube seat 2, the inner tube seat 4, the core tube seat 6 and the safety rope seat 8. When the main body 93 is displaced along the axial direction of the core tube 5, the main body 93 can rotate around the rotating shaft 91, and at the same time, the elastomer 92 can squeeze the main body 93 under its own elastic action to realize the movement and recovery of the main body 93 along the axial direction of the elastomer 92, thereby realizing the snap connection or separation of the main body 93 with the outer tube seat 2, the inner tube seat 4 and the core tube seat 6, which has the advantage of simple operation.

[0050] Furthermore, the inner tube seat 4, the core tube seat 6, and the safety rope seat 8 are all provided with a second through hole 10 that cooperates with the rotating shaft 91. The first through hole 931 and the second through hole 10 can be coaxially arranged to form a space for the rotating shaft 91 to rotate. On the one hand, the initial fixation of the position of the displacement locking mechanism 9 is achieved. On the other hand, the main body 93 can rotate around the rotating shaft 91 to allow the elastic body 92 to contract or recover.

[0051] Furthermore, the outer tube seat 2, the inner tube seat 4, and the core tube seat 6 all include a first matching portion 11, the first matching portion 11 is arranged toward the proximal end, the first matching portion 11 is arranged away from the opening end of the first blind hole 932, and the first matching portion 11 is arranged along the axial direction of the core tube 5. The main body portion 93 can form a locking state with the first matching portion 11 during the displacement process to achieve the locking of the relative positions of the outer tube seat 2 and the inner tube seat 4, the inner tube seat 4 and the core tube seat 6, and the core tube seat 6 and the safety rope seat 8.

[0052] Furthermore, the first matching portion 11 is a plate-type structure, and its end face facing the main body 93 is provided with a serrated track that matches the main body 93. While the main body 93 rotates around the rotating axis 91, it can move along the axial direction of the core tube 5 on the serrated track. At the same time, the elastomer 92 can squeeze the main body 93 under its own elastic action and lock it in different positions of the serrated track to achieve graded locking of the outer tube seat 2 and the inner tube seat 4, the inner tube seat 4 and the core tube seat 6, and the core tube seat 6 and the safety rope seat 8.

[0053] Furthermore, the slope of the zigzag track is set toward the proximal end, so that when the safety rope seat 8, the core tube seat 6, and the inner tube seat 4 move from the proximal end to the distal end, the outer tube seat 2 and the inner tube seat 4, the inner tube seat 4 and the core tube seat 6, and the core tube seat 6 and the safety rope seat 8 can be automatically locked.

[0054] In some specific embodiments of the present application, Figure 4-Figure 7 As shown, the safety rope seat 8, the core tube seat 6, the inner tube seat 4 and the outer tube seat 2 also include a first connecting part 12, which is a tubular structure. The safety rope 7, the core tube 5, the inner tube 3 and the outer tube 1 can be sleeved in the first connecting part 12 and connected to the first connecting part 12 to achieve a stable connection with each other.

[0055] Furthermore, if Figure 4-Figure 7 As shown, the core tube seat 6, the inner tube seat 4 and the outer tube seat 2 also include a second matching portion 13, the second matching portion 13 is connected to the outer periphery of the first connecting portion 12, and the first matching portion 11 is connected to the side of the second matching portion 13 toward the proximal end to provide activity space and avoidance space for the displacement locking mechanism 9.

[0056] In some preferred embodiments of the present application, to facilitate the operator's operation, the core tube seat 6, the inner tube seat 4 and the outer tube seat 2 also include a first handle 14, which is a plate-shaped protrusion connected to the outer periphery of the first connecting portion 12 and the second matching portion 13.

[0057] Furthermore, the safety rope seat 8, the core tube seat 6, and the inner tube seat 4 also include a third matching portion 15, which is connected to the outer periphery of the first connecting portion 12. The third matching portion 15 is provided with a second through hole 10 and a third through hole 16. The rotating shaft 91 can pass through the second through hole 10 and be movably connected to the second through hole 10. The main body 93 can extend out of the third through hole 16 and form a locked state with the zigzag track of the first matching portion 11, so as to provide activity space and avoidance space for the displacement locking mechanism 9.

[0058] In some preferred embodiments of the present application, Fig.11As shown, the safety rope seat 8, the core tube seat 6, and the inner tube seat 4 further include a recessed portion 17, which is located at the outer periphery of the third matching portion 15, and the first matching portion 11 can be accommodated in the recessed portion 17, and one side of the recessed portion 17 can limit the circumferential rotation of the first matching portion 11. On the one hand, the circumferential rotation between the safety rope seat 8 and the core tube seat 6, between the core tube seat 6 and the inner tube seat 4, and between the inner tube seat 4 and the outer tube seat 2 can be limited; on the other hand, the displacement locking mechanism 9 can be disengaged from the zigzag track of the first matching portion 11 by rotating the safety rope seat 8, the core tube seat 6, and the inner tube seat 4 in a direction away from the recessed portion 17, thereby achieving unlocking between the safety rope seat 8 and the core tube seat 6, between the core tube seat 6 and the inner tube seat 4, and between the inner tube seat 4 and the outer tube seat 2.

[0059] In some preferred embodiments of the present application, in order to facilitate the operation of the operator, the safety rope seat 8 also includes a second handle portion 18, and the second handle portion 18 is a plate-shaped protrusion connected to the outer periphery of the first connecting portion 12 and the third matching portion 15.

[0060] In some preferred embodiments of the present application, in order to prevent the safety rope 7 from accidentally falling off and affecting the transportation and insertion stability of the urethral stent 0, the safety rope 7 is provided with a flat portion, and the channel of the safety rope seat 8 for accommodating the safety rope 7 is provided with a limiting portion that cooperates with the flat portion. The moving distance of the safety rope 7 is limited by limiting the flat portion.

[0061] In some preferred embodiments of the present application, Fig.12 As shown, a barb-type structure 51 is provided at the distal end of the core tube 5 , and the proximal end of the barb-type structure 51 can abut against the distal end of the urethral stent 0 , thereby limiting the urethral stent 0 and further preventing the urethral stent 0 from accidentally falling off.

[0062] In some preferred embodiments of the present application, the length of the core tube 5 is greater than that of the inner tube 3, so that the distal end of the core tube 5 can extend beyond the distal end of the inner tube 3, so that the urethral stent 0 is exposed in the urethra to successfully complete the implantation operation.

[0063] Furthermore, the distance between the distal end of the core tube 5 and the distal end of the inner tube 3 is slightly greater than the length of the urethral stent 0 , thereby achieving full release of the urethral stent 0 .

[0064] In some specific embodiments of the present application, the urethral stent 0 is made of a memory metal material. Before reaching the urethral stenosis position, the urethral stent 0 is sleeved on the outer periphery of the core tube 5 and is compressed between the core tube 5 and the inner tube 3. When reaching the urethral stenosis position, the inner tube 3 is withdrawn to expose the urethral stent 0. The urethral stent 0 returns to a preset shape and the insertion is completed.

[0065] In some preferred embodiments of the present application, the urethral stent 0 is made of a memory material having a temperature phase change point. Before reaching the urethral stenosis position, the urethral stent 0 is sleeved on the outer periphery of the core tube 5, and the proximal end can abut against the distal end of the inner tube 3. When reaching the urethral stenosis position, the urethral stent 0 is restored to a preset shape by delivering sterile liquid at the phase change point temperature to the position of the urethral stent 0.

[0066] Specifically, Fig.12 As shown, the distal end of the core tube 5 is provided with a liquid outlet 52 connected to the pipeline of the core tube 5, and sterile liquid at the phase change point temperature is injected into the core tube through the core tube seat 6, so that the distal end of the urethral stent 0 returns to a preset shape.

[0067] Specifically, an injection channel 41 is provided on the outer periphery of the inner tube seat 4, through which sterile liquid at the phase change point temperature can be injected into the inner tube 3, so that the sterile liquid can flow out from the distal end of the inner tube 3, allowing the proximal end of the urethral stent 0 to return to a preset shape.

[0068] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A urethral stent placement device, comprising a core tube, an inner tube, an outer tube, a safety rope, a core tube seat, an inner tube seat, an outer tube seat and a safety rope seat, wherein the core tube is sleeved on the outer circumference of the safety rope and can be displaced along the axial direction of the safety rope, the inner tube is sleeved on the outer circumference of the core tube and can be displaced along the axial direction of the core tube, the outer tube is sleeved on the outer circumference of the inner tube and can be displaced along the axial direction of the inner tube, the safety rope seat, the core tube seat, the inner tube seat and the outer tube seat are respectively connected to the proximal ends of the safety rope, the core tube, the inner tube and the outer tube, characterized in that: It also includes a plurality of displacement locking mechanisms, which are arranged between the safety rope seat and the core tube seat, between the core tube seat and the inner tube seat, and between the inner tube seat and the outer tube seat; The displacement locking mechanism includes a rotating shaft, an elastic body and a main body. The main body is provided with a first through hole, and the rotating shaft can be accommodated in the first through hole and movably connected with the core tube seat, the inner tube seat and the safety rope seat through the first through hole; the main body is provided with a first blind hole, and the elastic body can be accommodated in the first blind hole. One end of the elastic body along the axial direction thereof abuts against the closed end of the first blind hole, and the other end can extend out of the first blind hole and abut against the inner walls of the core tube seat, the inner tube seat and the safety rope seat respectively. The main body can be respectively engaged and connected with the outer tube seat, the inner tube seat and the core tube seat.

2. A urethral stent placement device according to claim 1, characterized in that: The inner tube seat, the core tube seat, and the safety rope seat are respectively provided with a second through hole that matches the rotating shaft. The second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

3. A urethral stent placement device according to claim 1, characterized in that: The outer tube seat, the inner tube seat, and the core tube seat all include a first matching portion, the first matching portion is arranged toward the proximal end, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the core tube, and the main body can form a locking state with the first matching portion during the displacement process.

4. A urethral stent placement device according to claim 3, characterized in that: The first matching portion is a plate-shaped structure, and a sawtooth track matching with the main body is arranged on the end surface thereof facing the main body.

5. A urethral stent placement device according to claim 4, characterized in that: The slope of the zigzag track is arranged toward the proximal end.

6. A urethral stent placement device according to claim 1, characterized in that: The safety rope is provided with a flat portion, and a limiting portion cooperating with the flat portion is provided in a channel of the safety rope seat for accommodating the safety rope.

7. A urethral stent placement device according to claim 1, characterized in that: The distal end of the core tube is provided with a barb-type structure, and the proximal end of the barb-type structure can abut against the distal end of the urethral stent.

8. The urethral stent placement device according to claim 1, characterized in that: The length of the core tube is greater than the length of the inner tube.

9. The urethral stent placement device according to claim 7, characterized in that: The distal end of the core tube is provided with a liquid outlet which is connected with the pipeline of the core tube.

10. The urethral stent placement device according to claim 1, characterized in that: A liquid injection channel is arranged on the outer periphery of the inner tube seat.

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