A stent inserter

Abstract

The present invention discloses a stent implanter, comprising a fixed handle and a firing handle movably mounted below the fixed handle. The fixed handle includes an inner tube, an outer tube, and a tube transmission assembly, which are sequentially mounted on the inner tube. The proximal end of the inner tube is fixedly mounted within the fixed handle, and the distal end extends outside the fixed handle. The inner tube is mounted with a pointer assembly movably connected to the tube transmission assembly, and the pointer assembly is fixedly connected to the proximal end of the outer tube. The fixed handle also includes a gear transmission assembly connected to the firing handle. The fixed handle is provided with a shift button, and the gear transmission assembly is adapted to switch the transmission direction via the shift button. The pointer assembly is adapted to drive the tube transmission assembly to move forward and backward via the gear transmission assembly. The present invention effectively solves the problems of prior art stent implantation surgery that require two-handed operation and inaccurate stent release position. The present invention allows for shifting and adjustment at any time, accurately controls the release position, simplifies surgical operation, and improves treatment effectiveness.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a stent implanter. Background Art

[0002] Malignant tumors of the digestive tract can cause severe obstruction in the late stages of the disease. Statistics show that 40% of gastric cancer patients and 95% of pancreatic cancer patients with duodenum involvement cannot undergo radical surgery. In this case, stent treatment is very necessary. Stent treatment is a common and very effective treatment method, and surgical stent placement through endoscopy is more common. Currently, traditional stent implanters typically consist of two controllers, one connecting the inner and one connecting the outer tubes. During surgery, the endoscope is first passed through the pathological stenosis. If the endoscope cannot pass through the stenotic lesion, a zebra guidewire is first passed through the stenosis. A plastic cannula is then placed along the guidewire, and contrast agent is injected. The distal lesion location is determined under X-rays, and the entire lesion length is measured. The required stent length is then determined again (2 cm above and below the lesion). The TTS implanter is then passed through the endoscope along the guidewire to the stenosis. To release the stent, the surgeon must simultaneously control two handles (front and rear) to control the relative position of the inner and outer tubes to release the stent. This traditional stent implanter has low position control accuracy and requires high skill and experience. The surgeon must hold the rear handle still and withdraw the front handle to release the stent. During the actual surgery, the surgeon is in a state of intense concentration, making it difficult to completely hold the rear handle still. Accidental displacement often occurs, resulting in inaccurate stent release, prolonged surgery, and compromised treatment effectiveness. Summary of the Invention

[0003] The purpose of the present invention is to address the shortcomings of the existing technology and propose a stent implanter, which solves the problems in the existing technology such as the need for two-handed operation during stent implantation surgery and the inaccurate stent release position. It can be shifted and adjusted at any time, the release position can be accurately controlled, the surgical operation is simplified, and the treatment effect is improved.

[0004] The technical solution for achieving the purpose of the present invention is:

[0005] A stent inserter comprises a fixed handle and a firing handle movably mounted at the lower portion of the fixed handle; the fixed handle is provided with an inner tube, an outer tube and a tube transmission assembly which are sequentially sleeved on the inner tube; the proximal end of the inner tube is fixedly mounted within the fixed handle, and the distal end extends to the exterior of the fixed handle; the inner tube is sleeved with a pointer assembly movably connected to the tube transmission assembly, and the pointer assembly is fixedly connected to the proximal end of the outer tube; the fixed handle is further provided with a gear transmission assembly connected to the firing handle; the fixed handle is provided with a shift button, the gear transmission assembly is adapted to switch the transmission direction via the shift button, and the pointer assembly is adapted to achieve forward and backward movement by driving the tube transmission assembly via the gear transmission assembly.

[0006] Furthermore, the tube transmission assembly includes a lead tube rotatably installed in a fixed handle and a threaded tube sleeved on the lead tube and fixedly installed in the fixed handle; the lead tube is fixedly connected to the gear transmission assembly; the lead tube and the threaded tube are respectively provided with a lead groove and a thread groove along the length direction, and the pointer assembly passes through the lead groove and the thread groove, and the gear transmission assembly drives the lead tube to rotate so that the pointer assembly moves along the lead groove under the action of the thread groove, thereby driving the outer tube to move and releasing the bracket.

[0007] Furthermore, the pointer assembly includes a pointer connector, a pointer, and a pointer pin. The pointer connector is provided with a pin hole. The pointer includes an integrally formed annular mounting portion and an indicating portion. The annular mounting portion is sleeved onto the threaded tube. The inner ring of the annular mounting portion is provided with an annular groove. The pointer pin sequentially passes through the pin hole, the lead groove, and the thread groove and is movably mounted within the annular groove. When the lead tube rotates, the pointer pin moves along the thread groove and simultaneously rotates along the annular groove, driving the pointer assembly to move along the lead groove, thereby moving the outer tube and releasing the bracket.

[0008] Furthermore, the distal end of the pointer connector is provided with a connecting portion with an opening, the end of which is fixedly mounted with an outer tube mounting assembly, and the outer tube is fixedly connected to the pointer assembly via the outer tube mounting assembly. The provision of the opening makes the connecting portion elastic and facilitates connection.

[0009] Furthermore, the outer tube installation assembly includes an outer tube connector and an outer tube fixing member, the outer tube connector is inserted into the proximal end of the outer tube, the proximal end of the outer tube is inserted into the outer tube fixing member, and the outer tube connector and the outer tube fixing member are fixed and locked by threaded connection.

[0010] Furthermore, the upper end of the fixed handle is provided with a handle scale groove and a handle scale along the length direction, and the indicator portion passes through the handle scale groove. By providing the handle scale, the movement distance of the outer tube can be intuitively displayed, making it easier for the operator to accurately release the stent.

[0011] Furthermore, the gear transmission assembly includes a first transmission assembly, a second transmission assembly and a third transmission assembly that are sequentially connected, a push block suitable for driving the first transmission assembly to move is fixed on the firing handle, the shift button is suitable for changing the transmission direction of the second transmission assembly, and the third transmission assembly is suitable for driving the lead tube to rotate axially.

[0012] Furthermore, the first transmission assembly includes a ratchet wheel and a driving wheel that are coaxially fixedly connected, and the ratchet wheel cooperates with the pushing block. The pushing block is engaged with the teeth of the ratchet wheel, thereby driving the driving wheel to rotate, thereby driving the second transmission assembly to operate.

[0013] Furthermore, the second transmission assembly includes a first bevel gear and a second bevel gear arranged coaxially and symmetrically, and a third bevel gear meshed with the first bevel gear and the second bevel gear. A shift gear meshed with the driving wheel is movably installed between the first bevel gear and the second bevel gear. The shift gear is suitable for changing the rotation direction of the third bevel gear by driving the first bevel gear and the second bevel gear to rotate respectively, thereby changing the transmission direction of the second transmission assembly.

[0014] Furthermore, one end of the shift button is rotatably mounted on the fixed handle, and a convex portion is provided on the inner side of the other end. The fixed handle is provided with a through hole that matches the convex portion. One end of the gear shaft of the shift gear is fixedly provided with a spring, and the other end is movably mounted on the fixed handle and extends to the through hole. The inner sides of the first bevel gear and the second bevel gear are respectively provided with a first gear ring and a second gear ring that mesh with the shift gear, and the other end of the spring is fixedly mounted in the fixed handle; when the convex portion of the shift button overlaps with the through hole, the spring is compressed, the shift gear meshes with the first gear ring, thereby driving the first bevel gear to rotate; when the convex portion of the shift button leaves the through hole, the spring is reset, the shift gear meshes with the second gear ring, thereby driving the second bevel gear to rotate, realizing the shift function.

[0015] Furthermore, the third transmission assembly includes a first transmission gear coaxially fixedly connected to the third bevel gear, and a second transmission gear meshing with the first transmission gear and fixedly mounted on the proximal end of the lead tube. The third bevel gear drives the first transmission gear to rotate, thereby driving the second transmission gear to rotate, thereby rotating the lead tube and ultimately achieving forward and backward movement of the outer tube.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] (1) The present invention drives the gear transmission assembly to move by holding the firing handle, thereby driving the tube transmission assembly to move, and then realizing the movement of the pointer assembly that is sleeved on the inner tube and movably connected to the tube transmission assembly, and finally realizing the movement of the outer tube that is sleeved on the inner tube and fixedly connected to the pointer assembly, thereby realizing the function of releasing the bracket. At the same time, by setting a shift button to switch the transmission direction of the gear transmission assembly, the movement direction of the outer tube can be shifted and adjusted at any time, thereby accurately controlling the release position of the bracket, simplifying the surgical operation, and improving the treatment effect.

[0018] (2) The tube transmission assembly of the present invention includes a lead tube provided with a lead groove and a threaded tube provided with a thread groove. The lead tube is driven to rotate by the gear transmission assembly so that the pointer assembly moves along the lead groove under the action of the thread groove, thereby driving the outer tube to move and releasing the bracket. With this structural design, there is no jamming in the transmission process and the movement is smoother.

[0019] (3) The pointer assembly of the present invention is provided with a pointer pin, a pointer connector provided with a pin hole, and a pointer sleeved on a threaded tube and provided with an annular groove. The pointer pin passes through the pin hole, the lead groove, and the thread groove in sequence. When the lead tube rotates, the pointer pin moves along the thread groove and rotates along the annular groove at the same time, driving the pointer assembly to move along the lead groove, thereby realizing the movement of the outer tube and releasing the bracket.

[0020] (4) The connecting portion of the pointer connector of the present invention is provided with an opening, so that the connecting portion has elasticity and is convenient for connection with the outer tube mounting assembly.

[0021] (5) The outer tube mounting components of the present invention are connected to the outer tubes by screw threads, making the connection more firm and convenient.

[0022] (6) The fixed handle of the present invention is provided with a handle scale, which can intuitively display the moving distance of the outer tube, making it convenient for the operator to accurately release the bracket.

[0023] (7) The gear transmission assembly of the present invention includes a first transmission assembly, a second transmission assembly, and a third transmission assembly that are sequentially connected. The transmission direction of the second transmission assembly can be changed by a shift button, thereby changing the transmission direction of the third transmission assembly, and further changing the rotation direction of the lead tube, so that the pointer assembly drives the outer tube to move forward and backward.

[0024] (8) The present invention drives the driving wheel to rotate by fixing the pushing block fixed on the firing handle to engage the teeth of the ratchet wheel of the first transmission assembly, thereby driving the second transmission assembly to move.

[0025] (9) The second transmission assembly of the present invention is provided with a shift gear that can respectively drive the first bevel gear and the second bevel gear to rotate, thereby realizing clockwise and counterclockwise rotation of the third bevel gear, thereby realizing the change of the transmission direction of the second transmission assembly.

[0026] (10) The third transmission assembly of the present invention drives the first transmission gear to rotate through the third bevel gear, thereby driving the second transmission gear to rotate, thereby realizing the rotation of the lead tube and ultimately realizing the forward and backward movement of the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 Schematic diagram of the external structure of the present invention;

[0029] Figure 2 Schematic diagram of the internal structure of the present invention;

[0030] Figure 3 for Figure 2A local enlarged view of point A;

[0031] Figure 4 This is a schematic diagram of the structure of the gear transmission assembly of the present invention;

[0032] Figure 5 This is a bottom view of the gear transmission assembly of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the lead tube of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the threaded pipe of the present invention;

[0035] Figure 8 A perspective view of a pointer connector according to the present invention;

[0036] Figure 9 A three-dimensional diagram of the pointer of the present invention;

[0037] Figure 10 This is a schematic diagram of the state in which the outer tube of the shift button of the present invention is located in the initial position when it is in the "forward" position;

[0038] Figure 11 This is a schematic diagram of the state in which the outer tube of the shift button of the present invention moves to the far end when the shift button is in the "forward" position;

[0039] Figure 12 This is a schematic diagram of the state in which the outer tube begins to retreat from the far end when the shift button of the present invention is in the "return" position;

[0040] Figure 13 This is a schematic diagram of the state in which the outer tube of the shift button of the present invention returns to its initial position when the shift button is in the "return" position.

[0041] The reference numerals in the accompanying drawings are:

[0042] Fixed handle 1, through hole 1-1, handle scale groove 1-2;

[0043] Firing handle 2, protrusion 2-1, push block 2-2;

[0044] Inner tube 3;

[0045] Outer tube 4;

[0046] Shift button 5;

[0047] First transmission assembly 6, first rotating shaft 6-1, ratchet 6-2, driving wheel 6-3, torsion spring 6-4;

[0048] Second transmission assembly 7, shift gear 7-1, first bevel gear 7-2, first ring gear 7-2-1, second bevel gear 7-3, second ring gear 7-3-1, third bevel gear 7-4;

[0049] The third transmission assembly 8, the first transmission gear 8-1, the second transmission gear 8-2;

[0050] Lead tube 9, lead groove 9-1;

[0051] Threaded pipe 10, thread groove 10-1;

[0052] Pointer connector 11, pin hole 11-1, connecting portion 11-2;

[0053] Pointer 12, annular mounting portion 12-1, annular groove 12-1-1, indicating portion 12-2;

[0054] Pointer pin 13;

[0055] Outer tube installation assembly 14, outer tube connector 14-1, outer tube fixing member 14-2;

[0056] Outer tube anti-rotation part 15. DETAILED DESCRIPTION

[0057] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0058] (Example 1)

[0059] like Figures 1 to 9 The stent inserter shown includes a fixed handle 1, a firing handle 2, an inner tube 3, an outer tube 4, a tube transmission assembly, a pointer assembly, and a gear transmission assembly. The outer tube 4 and the tube transmission assembly are sequentially mounted on the inner tube 3 from the inside out. The proximal end of the inner tube 3 is fixedly mounted within the fixed handle 1, and the distal end extends outside the fixed handle 1. The pointer assembly is mounted on the inner tube 3 and movably connected to the tube transmission assembly. The proximal end of the outer tube 4 is fixedly connected to the pointer assembly. A shift button 5 is also provided on the fixed handle 1 for switching the transmission direction of the gear transmission assembly. The movement direction of the outer tube 4 can be adjusted at any time, thereby precisely controlling the stent release position, simplifying surgical procedures, and improving treatment effectiveness.

[0060] Specifically, the gear transmission assembly includes a first transmission assembly 6, a second transmission assembly 7, and a third transmission assembly 8, which are disposed within the fixed handle 1 and are sequentially connected in a transmission manner. The first transmission assembly 6 includes a first rotating shaft 6-1 disposed within the fixed handle 1, a ratchet 6-2 fixedly mounted on the first rotating shaft 6-1, and a driving wheel 6-3. The upper portion of the firing handle 2 is rotatably mounted on the first rotating shaft 6-1. The first rotating shaft 6-1 is also provided with a torsion spring 6-4. The firing handle 2 is provided with a protrusion 2-1. One end of the torsion spring 6-4 abuts the protrusion 2-1, and the other end abuts the fixed handle 1, thereby achieving the automatic reset function of the firing handle 2. A push block 2-2 is provided on one side of the upper portion of the firing handle 2, which cooperates with the teeth of the ratchet 6-2.

[0061] The second transmission assembly 7 includes a shift gear 7-1, a first bevel gear 7-2, a second bevel gear 7-3, and a third bevel gear 7-4. The shift gear 7-1 meshes with the driving wheel 6-3. The first and second bevel gears 7-2 and 7-3 are coaxially symmetrically arranged. The shift gear 7-1 is coaxially slidably mounted between the first and second bevel gears 7-2 and 7-3. The third bevel gear 7-4 meshes with both the first and second bevel gears 7-2 and 7-3. One end of the shift button 5 is rotatably mounted on the fixed handle 1. The other end is provided with a protrusion on the inner side. The fixed handle 1 has a through hole 1-1 that mates with the protrusion. A spring is fixed to one end of the gear shaft of the shift gear 7-1. The other end is movably mounted on the fixed handle 1 and extends to the through hole 1-1. The other end of the spring is fixedly mounted within the fixed handle 1. The first and second bevel gears 7-2 and 7-3 are provided with a first ring gear 7-2-1 and a second ring gear 7-3-1 on the inner sides, respectively, that mesh with the shift gear 7-1. When the convex portion of shift button 5 overlaps through-hole 1-1, the spring is compressed, causing shift gear 7-1 to engage with both the first ring gear 7-2-1 and the driving wheel 6-3, thereby rotating the first bevel gear 7-2. When the convex portion of shift button 5 leaves through-hole 1-1, the spring returns to its original position, causing shift gear 7-1 to engage with both the second ring gear 7-3-1 and the driving wheel 6-3, thereby rotating the second bevel gear 7-3. The rotation of the first and second bevel gears 7-2 and 7-3 changes the direction of rotation of the third bevel gear 7-4, thereby changing the transmission direction of the second transmission assembly. A shift indicator is also provided on the fixed handle 1, located near the shift button 5, to prevent accidental operation.

[0062] The third transmission assembly 8 includes a first transmission gear 8-1 coaxially fixedly connected to the third bevel gear 7-3 and a second transmission gear 8-2 meshing with the first transmission gear 8-1. The third bevel gear 7-3 drives the first transmission gear 8-1 to rotate, thereby driving the second transmission gear 8-2 to rotate.

[0063] The tube drive assembly includes a lead tube 9 rotatably mounted within the fixed handle 1, and a threaded tube 10 sleeved over the lead tube 9 and fixedly mounted within the fixed handle 1. The proximal end of the lead tube 9 is coaxially fixedly connected to the second transmission gear 8-2. The lead tube 9 and threaded tube 10 are respectively provided with a lead groove 9-1 and a thread groove 10-1 along their lengths. Two lead grooves 9-1 are symmetrically arranged on the outer circumference of the lead tube 9.

[0064] The pointer assembly includes a pointer connector 11, a pointer 12, and a pointer pin 13. Pointer connector 11 is provided with a pin hole 11-1. Pointer 12 comprises an integrally formed annular mounting portion 12-1 and an indicating portion 12-2. The inner ring of annular mounting portion 12-1 is provided with an annular groove 12-1-1. Annular mounting portion 12-1 is sleeved onto threaded tube 10. Both ends of pointer pin 13 extend through pin hole 11-1, lead groove 9-1, and thread groove 10-1, respectively, and are movably mounted within annular groove 12-1-1. When lead tube 9 rotates, pointer pin 13 moves along thread groove 10-1 and simultaneously rotates along annular groove 12-1-1, thereby driving the pointer assembly along lead groove 9-1. The coordination between threaded tube 10 and pointer assembly ensures smooth, non-stuttering movement of outer tube 4.

[0065] The distal end of the pointer connector 11 is provided with a connecting portion 11-2 with an opening. An outer tube mounting assembly 14 is fixedly mounted on the end of the connecting portion 11-2. The provision of the opening makes the connecting portion 11-2 elastic, making it easier to connect to the outer tube mounting assembly 14. The outer tube mounting assembly 14 includes an outer tube connector 14-1 and an outer tube fixing member 14-2. The outer tube connector 14-1 is inserted into the proximal end of the outer tube 4, and the proximal end of the outer tube 4 is inserted into the outer tube fixing member 14-2. The outer wall of the outer tube connector 14-1 and the inner wall of the outer tube fixing member 14-2 are fixed and locked together by a threaded connection, thereby locking the outer tube 4. The threaded connection method is more secure and convenient. The distal end of the fixed handle 1 is fixed with an outer tube anti-rotation member 15 to prevent the outer tube 4 from rotating when moving to the distal end, affecting the release of the bracket.

[0066] The upper end of the fixed handle 1 is provided with a handle scale groove 1-2 and a handle scale along its length. The indicator portion 12-2 of the pointer assembly passes through the handle scale groove and extends to the outside of the fixed handle 1. By providing the handle scale, the movement distance of the outer tube 4 can be intuitively displayed, making it easier for the operator to accurately release the stent.

[0067] The movement process of the stent implanter in this embodiment is as follows:

[0068] like Figures 10 and 11As shown, when the shift button 5 is in the "forward" position, the shift gear 7-1 meshes with the first ring gear 7-2-1 of the second transmission assembly 7. When the firing handle 2 is gripped, the push block 2-2 engages the teeth of the ratchet 6-2 of the first transmission assembly 6, thereby driving the ratchet 6-2 counterclockwise, which in turn drives the driving wheel 6-3 counterclockwise. The driving wheel 6-3 drives the shift gear 7-1 clockwise, which in turn drives the first bevel gear 7-2 clockwise, thereby driving the third bevel gear 7-4 counterclockwise. The third bevel gear 7-4 drives the first transmission gear 8-1 counterclockwise, which in turn drives the second transmission gear 8-2 clockwise, and the lead tube 9 clockwise. The pointer assembly moves from the proximal end to the distal end along the lead groove 9-1, the thread groove 10-1, and the handle scale groove 1-2, at which point the bracket retracts within the outer tube 4.

[0069] like Figures 12 to 13 As shown, when the shift button 5 is in the "reverse" position, indicating the shift indicator, the shift gear 7-1 meshes with the second ring gear 7-3-1 of the second transmission assembly 7. When the firing handle 2 is gripped, the push block 2-2 engages the teeth of the ratchet 6-2 of the first transmission assembly 6, thereby driving the ratchet 6-2 counterclockwise, which in turn drives the driving wheel 6-3 counterclockwise. The driving wheel 6-3 drives the shift gear 7-1 clockwise, which in turn drives the second bevel gear 7-3 clockwise, which in turn drives the third bevel gear 7-4 clockwise. The third bevel gear 7-4 drives the first transmission gear 8-1 clockwise, which in turn drives the second transmission gear 8-2 counterclockwise, and also drives the lead tube 9 counterclockwise. The pointer assembly moves from the distal end to the proximal end along the lead groove 9-1, the thread groove 10-1, and the handle scale groove 1-2, at which point the bracket is released from the outer tube 4.

[0070] In this embodiment, the trigger handle 2 is manually gripped to drive the gear transmission assembly, thereby driving the tube transmission assembly, thereby causing the pointer assembly, which is mounted on the inner tube 3 and movably connected to the tube transmission assembly, to move. Ultimately, the outer tube 4, which is mounted on the inner tube 3 and fixedly connected to the pointer assembly, moves, thereby releasing the stent. A shift button 5 is provided to switch the transmission direction of the gear transmission assembly. The movement direction of the outer tube 4 can be adjusted at any time, thereby precisely controlling the release position of the stent, simplifying surgical procedures and improving treatment effectiveness. The tube transmission assembly includes a lead tube with a lead groove and a threaded tube with a thread groove. The gear transmission assembly drives the lead tube to rotate, thereby causing the pointer assembly to move along the lead groove under the action of the thread groove, thereby driving the outer tube to move and release the stent. With this structural design, the entire operation process is smooth and has no lag. Furthermore, a handle scale is provided on the fixed handle 1 to intuitively display the movement distance of the outer tube 4, making it easier for the operator to accurately release the stent.

[0071] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stent implanter, characterized in that: The invention comprises a fixed handle (1) and a firing handle (2) movably mounted on the lower part of the fixed handle (1); the fixed handle (1) is provided with an inner tube (3) and an outer tube (4) and a tube transmission assembly which are sequentially sleeved on the inner tube (3); the proximal end of the inner tube (3) is fixedly mounted in the fixed handle (1), and the distal end extends to the outside of the fixed handle (1); the inner tube (3) is sleeved with a pointer assembly movably connected to the tube transmission assembly, and the pointer assembly is fixedly connected to the proximal end of the outer tube (4); the fixed handle (1) is also provided with a gear transmission assembly connected to the firing handle (2); the fixed handle (1) is provided with a shift button (5), the gear transmission assembly is suitable for switching the transmission direction through the shift button (5), and the pointer assembly is suitable for driving the tube transmission assembly to move forward and backward through the gear transmission assembly; The tube transmission assembly comprises a lead tube (9) rotatably mounted in a fixed handle (1) and a threaded tube (10) sleeved on the lead tube (9) and fixedly mounted in the fixed handle (1); the lead tube (9) is fixedly connected to the gear transmission assembly; the lead tube (9) and the threaded tube (10) are respectively provided with a lead groove (9-1) and a thread groove (10-1) along their lengths, and the pointer assembly passes through the lead groove (9-1) and the thread groove (10-1); The pointer assembly comprises a pointer connecting member (11), a pointer (12) and a pointer pin shaft (13); the pointer connecting member (11) is provided with a pin hole (11-1); the pointer (12) comprises an integrally formed annular mounting portion (12-1) and an indicating portion (12-2); the annular mounting portion (12-1) is sleeved on the threaded tube (10); the inner ring of the annular mounting portion (12-1) is provided with an annular groove (12-1-1); the pointer pin shaft (13) passes through the pin hole (11-1), the lead groove (9-1) and the thread groove (10-1) in sequence and is movably mounted in the annular groove (12-1-1).

2. The stent implanter according to claim 1, characterized in that: The distal end of the pointer connector (11) is provided with a connecting portion (11-2) with an opening, an outer tube mounting assembly (14) is fixedly mounted on the end of the connecting portion (11-2), and the outer tube (4) is fixedly connected to the pointer assembly via the outer tube mounting assembly (14).

3. The stent implanter according to claim 2, characterized in that: The outer tube installation assembly (14) comprises an outer tube connector (14-1) and an outer tube fixing member (14-2); the outer tube connector (14-1) is inserted into the proximal end of the outer tube (4); the proximal end of the outer tube (4) is inserted into the outer tube fixing member (14-2); the outer tube connector (14-1) and the outer tube fixing member (14-2) are fixed and locked to the outer tube (4) through threaded connection.

4. The stent implanter according to claim 2, characterized in that: The upper end of the fixed handle (1) is provided with a handle scale groove (1-2) and a handle scale along the length direction, and the indicating portion (12-2) passes through the handle scale groove (1-2).

5. The stent implanter according to claim 1, characterized in that: The gear transmission assembly comprises a first transmission assembly (6), a second transmission assembly (7) and a third transmission assembly (8) which are sequentially connected in transmission. A push block (2-2) suitable for driving the first transmission assembly (6) is fixedly provided on the firing handle (2). The shift button (5) is suitable for changing the transmission direction of the second transmission assembly (7). The third transmission assembly (8) is suitable for driving the lead tube (9) to rotate along the axial direction.

6. The stent implanter according to claim 5, characterized in that: The first transmission assembly (6) comprises a ratchet (6-2) and a driving wheel (6-3) that are coaxially fixedly connected, and the ratchet (6-2) cooperates with the pushing block (2-2).

7. The stent implanter according to claim 6, characterized in that: The second transmission assembly (7) comprises a first bevel gear (7-2) and a second bevel gear (7-3) which are coaxially symmetrically arranged, and a third bevel gear (7-4) which is meshed with both the first bevel gear (7-2) and the second bevel gear (7-3); a shift gear (7-1) which is meshed with the driving wheel (6-3) is movably installed between the first bevel gear (7-2) and the second bevel gear (7-3); the shift gear (7-1) is suitable for changing the rotation direction of the third bevel gear (7-4) by driving the first bevel gear (7-2) and the second bevel gear (7-3) to rotate respectively.

8. The stent implanter according to claim 7, characterized in that: The third transmission assembly (8) comprises a first transmission gear (8-1) coaxially fixedly connected to the third bevel gear (7-4) and a second transmission gear (8-2) meshing with the first transmission gear (8-1) and coaxially fixedly mounted on the proximal end of the lead tube (9).

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