Conveying device

Abstract

The invention relates to a conveying device which comprises a handle and a tubular body, the handle comprises a shell and a connecting base arranged in the shell, the connecting base is connected with the tubular body and can drive the tubular body to axially move relative to the shell, a limiting part is arranged in the shell, and the limiting part is connected with the shell. A plurality of sound production areas are arranged on the inner wall of the limiting part, and each sound production area comprises a plurality of teeth which are sequentially arranged in the axial direction; the connecting base further comprises an elastic piece extending from the inner side to the outer side, and the free end of the elastic piece can abut against the sound production area and can slide along the sound production area under the driving of the connecting base. The invention further provides a technical scheme for transmitting the conveying state by using sound as an auxiliary means or as a main means.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical devices, and particularly to a delivery device. Background Art

[0002] Interventional therapy is a minimally invasive treatment technology for diseases through instruments such as catheters under the guidance of medical imaging equipment. During the interventional therapy process, the delivery of the implant is one of the key steps. Taking a conventional stent as an example, generally, a small incision is made at the puncture site of the patient, and then the sheath tube is reached at the lesion position of the human body with the help of a delivery device. Then, by withdrawing the outer tube, the inner tube remains stationary, and the stent is released, so that the stent is released and implanted at the predetermined position. However, during the whole process, the operator needs to monitor the position of the imaging point of the stent to make a judgment by vision. When the operator is affected by the outside world, such as light or fatigue, resulting in blocked or deviated vision, or misalignment due to the observation angle, the operator cannot make an accurate judgment. In addition, when the release is in the final stage, once the implant crosses the recoverable critical point, the risk of recovery is relatively high, that is, the implant cannot be recovered and adjusted in position, etc.

[0003] Therefore, relying solely on visual judgment has relatively high risks. Summary of the Invention

[0004] Based on this, in view of the delivery problems existing in the existing delivery device, it is necessary to provide an improved delivery device, specifically as follows:

[0005] A delivery device is provided, including a handle and a tubular body. The handle includes a housing and a connecting seat disposed in the housing. The connecting seat is connected to the tubular body, and the connecting seat can drive the tubular body to move axially relative to the housing. A limiting portion is provided in the housing, and a plurality of sound - generating regions are provided on the inner wall of the limiting portion. The sound - generating regions include a plurality of teeth arranged in sequence along the axial direction. The connecting seat further includes a spring piece extending from the inside to the outside, and the free end of the spring piece can abut against and slide along the sound - generating region under the drive of the connecting seat.

[0006] In one embodiment, the tooth density of the sound - generating region at the nearest - end position is greater than the tooth density and the average tooth height of the sound - generating region at the farthest - end position; or, the tooth density of the nearest - end region of the sound - generating region is greater than the tooth density of the farthest - end region of the sound - generating region.

[0007] In one embodiment, the average tooth height of the sound - generating region at the nearest - end position is greater than the average tooth height of the sound - generating region at the farthest - end position; or, the average tooth height of the nearest - end region of the sound - generating region is greater than the average tooth height of the farthest - end region of the sound - generating region.

[0008] In one embodiment, the elastic piece extends from the proximal end towards the distal end.

[0009] In one embodiment, an inner plate is provided inside the housing. A first threaded engagement portion is provided on the inner wall of the inner plate. The outer side of the connecting seat facing the inner plate includes at least one second threaded engagement portion. The second threaded engagement portion cooperates with the first threaded engagement portion and can move along the first threaded engagement portion. Rotation of the inner plate can drive the connecting seat to move axially. The limiting portion is located inside the inner plate and is fixedly connected to the housing. The limiting groove is provided with a slot extending axially. The second threaded engagement portion and the first threaded engagement portion cooperate with each other through the slot.

[0010] In one embodiment, the limiting portion includes a plurality of limiting grooves extending circumferentially, and the width of the limiting groove is greater than the width of the free end of the elastic piece. When the free end of the elastic piece reaches the position of the limiting groove, the free end of the elastic piece snaps into the limiting groove.

[0011] In one embodiment, the limiting groove penetrates the limiting portion in the radial direction.

[0012] In one embodiment, the handle includes a locking member. In a natural state, one end of the locking member is connected to the housing, and the other end extends from the outside of the limiting portion to near the mouth of the limiting groove or into the mouth of the limiting groove.

[0013] In one embodiment, one end of the locking member is rotatably connected to the housing, and the other end can rotate around the housing.

[0014] In one embodiment, a switch is further included. One end of the switch is connected to the locking member, and the other end extends out of the housing surface. The switch can drive the free end of the locking member to extend into the mouth.

[0015] In one embodiment, the free end of the elastic piece includes a protruding portion extending towards the outside. A groove is provided on the outside of the protruding portion, which is inclined towards the inside. Positioning members corresponding to the groove extend from the inner wall of the limiting groove towards the midline and the axis in an inclined manner.

[0016] Compared with the prior art, the present invention provides a conveying device, which includes a handle and a tubular body. The handle includes a housing and a connecting seat disposed inside the housing. The connecting seat is connected to the tubular body, and the connecting seat can drive the tubular body to move axially relative to the housing. A limiting portion is provided inside the housing, and several sound - generating regions are provided on the inner wall of the limiting portion. The sound - generating regions include a plurality of teeth arranged in sequence along the axial direction; the connecting seat further includes an elastic piece extending from the inside to the outside, and the free end of the elastic piece can abut against and slide along the sound - generating region under the drive of the connecting seat. In addition to not affecting the traditional visual monitoring means, a technical solution is also provided to use sound as an auxiliary or as the main means to transmit the conveying state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 6 is a schematic structural diagram of the conveying device in Embodiment 1 of the present invention from the first perspective;

[0018] Figure 2 along Figure 1 the cross - sectional view taken along the A - A direction in FIG. 6;

[0019] Figure 3 FIG. 16 is a schematic structural diagram of the conveying device in Embodiment 1 of the present invention from the second perspective;

[0020] Figure 4 along Figure 3 the cross - sectional view taken along the B - B direction in FIG. 16;

[0021] Figure 5 FIG. 26 is a working schematic diagram of the conveying device in Embodiment 1 of the present invention;

[0022] Figure 6 is Figure 5 the enlarged schematic diagram of the C area in FIG. 26;

[0023] Figure 7 FIG. 36 is a working schematic diagram of the conveying device in Embodiment 2 of the present invention;

[0024] Figure 8 is Figure 7 the enlarged schematic diagram of the D area in FIG. 36;

[0025] Figure 9 FIG. 46 is a working schematic diagram of the conveying device in Embodiment 3 of the present invention;

[0026] Figure 10 is Figure 9 the enlarged schematic diagram of the E area in FIG. 46. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be noted that in the field of interventional medical devices, generally, the end of a medical device implanted into the human body or an animal body that is closer to the operator is called the "proximal end", and the end that is farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined based on this principle. The "axial direction" generally refers to the length direction of the medical device when it is being delivered, and the "radial direction" generally refers to the direction perpendicular to the "axial direction" of the medical device, and the "axial direction" and "radial direction" of any component of the medical device are defined based on this principle. The "connection" mentioned in the embodiments includes the cases where two components are directly connected and indirectly connected through other components.

[0029] The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments.

[0030] Embodiment 1

[0031] Referring to the attached Figures 1-4 as shown, Figure 1 FIG. 1 is a schematic structural diagram of the delivery device 10 in the first perspective of Embodiment 1 of the present invention; Figure 2 FIG. 2 is a sectional view taken along the Figure 1 A-A direction in FIG. 1; Figure 3 FIG. 3 is a schematic structural diagram of the delivery device 10 in the second perspective of Embodiment 1 of the present invention; Figure 4 FIG. 4 is a sectional view taken along the Figure 3 B-B direction in FIG. 3. The delivery device 10 provided in Embodiment 1 includes a handle 100 and a sheath 200. The sheath 200 includes an outer tube 210, an inner tube 220 and a TIP head 230. The inner tube 220 and the outer tube 210 are tubular structures. The inner tube 220 and the outer tube 210 are connected to different positions on the handle 100. By operating the handle 100, the relative axial displacement of the outer tube 210 and the inner tube 220 can be achieved. The implant to be delivered is installed on the proximal side of the tip head 230 and is located in the middle layer between the inner tube 220 and the outer tube 210. The implant is pressed by the outer tube 210 against the outer wall of the inner tube 220. Before release, the tip head 230 restricts the axial position of the implant. When releasing, the position of the inner tube 220 remains unchanged, and the outer tube 210 moves towards the proximal direction, so that the external pressure on the implant disappears, and the implant expands to achieve implantation.

[0032] The handle 100 includes a housing 110, on which a knob 120 and a protection button 130 are provided. A protective sleeve 240 is covered at the junction of the housing 110 and the outer tube 210. The protective sleeve 240 is made of a relatively soft material such as silica gel. The protective sleeve 240 can prevent the junction of the outer tube 210 and the housing 110 from being bent, and maintain the normal conveying effect of the outer tube 210. The knob 120 is used to drive the relative movement of the outer tube 210 and the inner tube 220, so that the outer tube 210 moves towards the distal end or the proximal end, while the protection button 130 is used to lock and unlock the knob 120.

[0033] For the handle 100, a connection seat 211 fixedly connected to the outer tube 210 and an inner plate 140 capable of axial rotation are provided inside the housing 110. The connection seat 211 is movably connected to the inner plate 140, and the inner side of the inner plate 140 presents a threaded groove structure. At this time, the outer tube 210 is fixedly connected to the connection seat 211. The connection seat 211 includes at least one protrusion 212 towards the outside (in this embodiment, the outside refers to the direction away from the axis relative to the axis). The protrusion 212 is engaged in the threaded groove on the inner side of the inner plate 140 and can move along the threaded groove. The knob 120 is sleeved and fixed on the outside of the inner plate 140 (the two can be integrally formed). In this embodiment, the part of the inner plate 140 exposed outside the housing 110 is the knob 120 that can be controlled by the operator. Therefore, when the knob 120 is rotated under the operation of the operator, it drives the inner plate 140 to rotate, and both the inner plate 140 and the knob 120 are axially limited by the housing 110, so that the inner plate 140 only rotates around the axis. When the inner plate 140 rotates, relative movement occurs between the inner plate 140 and the connection seat 211. Due to the threaded connection between the inner plate 140 and the connection seat 211, the rotation of the inner plate 140 forces the connection seat 211 to move axially, thereby driving the outer tube 210 to move axially, and then realizing the relative axial displacement of the outer tube 210 and the inner tube 220 to cooperate to complete the subsequent release process of the implant.

[0034] In another embodiment, an external thread or other similar threaded structure can be selected on the inner side of the inner plate 140, and a threaded groove or other similar structure that can cooperate with the inner plate 140 is provided on the corresponding connection seat 211. Therefore, a first thread mating portion is provided on the inner wall of the inner plate 140, and at least one second thread mating portion is included on the outside of the connection seat 211 facing the inner plate 140. The second thread mating portion can cooperate with the first thread mating portion and slide relatively, that is, the connection seat 211 can move relative to the inner plate 140.

[0035] In another embodiment, in order to further prevent the friction between the protrusion 212 of the connection seat 211 and the threaded groove of the inner plate 140 from being too large, driving the connection seat 211 to rotate and driving the outer tube 210 to rotate, a convex rib extending axially is provided on the proximal side of the outer tube 210 and is engaged in the distal side of the housing 110.

[0036] In this embodiment, a limiting part 150 is sleeved outside the connecting seat 211. The limiting part 150 is fixed on the housing 110 and located inside the inner plate 140. At least one axially extending slot is formed in the limiting part 150 to accommodate the protrusion 212 of the connecting seat 211 to pass through. The slot can limit the circumferential movement of the protrusion 212. When the knob 120 drives the inner plate 140 to rotate, the protrusion 212 moves relative to the inner plate 140 and is restricted by the limiting part 150 to move horizontally along the axis, thereby driving the connecting seat 211 to move horizontally. In addition to restricting the movement direction of the protrusion 212, at least one sound - generating area 151 is distributed on the inner wall of the limiting part 150. The sound - generating area 151 includes a plurality of teeth arranged in sequence along the axis to form a rack - shaped sound - generating structure.

[0037] In this embodiment, the connecting seat 211 extends out a spring piece 213. One side of the spring piece 213 is fixed at the central part of the connecting seat 211, and the other side is a free end. The spring piece 213 abuts against the inner wall of the limiting part 150. The spring piece 213 makes a sound when passing through the sound - generating area 151. That is to say, the spring piece 213 can slide along the inner wall of the limiting part 150. In order not to affect the linear movement realized by the protrusion 212, the spring piece 213 and the protrusion 212 are located at different circumferential positions, so that they can realize their functions relatively independently.

[0038] In this embodiment, the extending direction of the spring piece 213 preferably faces the proximal side. This is because in the release stage, the outer tube 210 needs to move towards the proximal side. The free end of the spring piece 213 preferably facing the proximal side can reduce the friction force and facilitate the movement of the spring piece 213.

[0039] When the elastic piece 213 passes through the sound - generating area 151, it will generate sound, which is beneficial for the operator to determine the current state. In the prior art, when this conveying device is released, it needs to go through four stages: the preparation stage, the slow - release stage, the fast - release stage, and the full - release stage. The distinction between each stage depends on the operator observing the length marks inside and outside the developer (some conveying devices do not have external marks), but this is judged solely by vision. When the operator is affected by the outside world, such as light, fatigue, resulting in blocked or deviated vision, or misalignment due to the observation angle, the operator cannot make an accurate judgment. In addition, since when the release is in the final stage, once the implant crosses the recoverable critical point, the risk of recovery is relatively high, that is, the implant cannot be retrieved and its position adjusted, etc. Relying solely on visual judgment for the judgment of the release stage has a relatively high risk. The cooperation of the elastic piece 213 and the sound - generating area 151 in this embodiment solves the above problems. In addition to the existing visual judgment, it can also be assisted by sound. That is to say, when reaching the sensitive stage or a preset stage, the elastic piece 213 passes through the sound - generating area 151, and at this time, the conveying device will emit a sound for prompting. Different prompting sounds can also be emitted according to different stages, and it does not require a power source and a sensor, having high reliability.

[0040] The conveying device of this embodiment can feedback different sounds according to different stages during the release stage. Specifically, multiple sound - generating areas 151 are set (or the distribution of the teeth of the sound - generating area 151 is changed). The heights and density degrees of the racks of different sound - generating areas 151 are different to obtain different sound combinations. The denser the tooth distribution, the higher the frequency of the generated sound, and in the external manifestation, the higher the pitch of the sound. The higher the height of the teeth, the greater the loudness of the generated sound. For this embodiment, the higher the degree of the outer tube 210 moving towards the proximal end, the closer it is to the full release of the implant. Therefore, for the selection of the distribution of multiple sound - generating areas 151, the closer to the proximal end, the denser the tooth distribution and the higher the height of the teeth of the sound - generating area 151 in this embodiment. That is to say, in this embodiment, the tooth density and the average tooth height of the sound - generating area at the closest - proximal position (or the closest - proximal area of the sound - generating area) are greater than those of the sound - generating area at the farthest - distal position (or the farthest - distal area of the sound - generating area); in another embodiment, the tooth density and / or the average tooth height of the sound - generating area at the closest - proximal position (or the closest - proximal area of the sound - generating area) are greater than those of the sound - generating area at the farthest - distal position (or the farthest - distal area of the sound - generating area).

[0041] When other conditions remain unchanged, by changing the density of the teeth distribution in the sound - generating area 151 (the distance between adjacent teeth), that is, changing the number of teeth per unit distance of the path, the pitch of the sound can be changed. The more teeth there are per unit distance, the more times the elastic sheet 213 vibrates, the higher the vibration frequency, and the higher the pitch sounds. That is, the sound gives people the feeling of being higher, sharper, and more rapid. The fewer teeth there are per unit distance, the fewer times the elastic sheet 213 vibrates, the lower the vibration frequency, and the lower the pitch sounds. The sound gives people the feeling of being lower and duller.

[0042] When other conditions remain unchanged, by changing the height of the teeth in the sound - generating area 151, the loudness of the sound can be changed. When the teeth are higher, the stroke of the elastic sheet 213 from the top to the bottom of the teeth is longer, the maximum rebound speed is faster, the force is stronger, and the generated sound is louder and more powerful. When the teeth are lower, the stroke of the elastic sheet 213 from the top to the bottom of the teeth is shorter, the maximum rebound speed is slower, the force is smaller, and the generated sound is weaker and softer.

[0043] In addition, when other conditions remain unchanged, by combining the tooth shapes of multiple or single sound - generating areas 151, the combination of sounds can be changed. For example, the straight - shaped tooth groove is characterized by a straight - shaped tooth groove, which makes the vibration of the elastic sheet show a uniform frequency and volume, producing a clear and bright sound effect; the wavy tooth groove is characterized by a wavy concave - convex design, which makes the frequency and volume changes generated when the elastic sheet vibrates more diverse, creating a soft sound effect; the V - shaped tooth groove is characterized by a sharp V - shaped design, which makes the sound generated when the elastic sheet vibrates more stimulating and penetrating. The combination of various shape distributions can achieve changes in sound segments.

[0044] In another embodiment, it is not necessary to set a corresponding inner plate 140 inside the handle 100 to achieve the axial movement of the outer tube 210 through threaded connection. It can be directly pushed by setting a push rod at the distal end of the handle 100, or various transmission forms such as the meshing of gears and racks can be used. As long as the outer tube 210 can have an axial displacement through the connection seat 211 connected to it. In an alternative solution, the contact between the connection seat 211 and the sound - generating area 151 of the limiting part 150 can still produce sound, achieving the same technical effect.

[0045] In another embodiment, the handle 100 can control the axial movement of the inner tube 220. The inner tube 220 can adopt a setting corresponding to the outer tube 210 in this embodiment, and the sound - generating effect can also be achieved. In other embodiments, the sound - generating effect can also be set for both the outer tube 210 and the inner tube 220.

[0046] The handle includes a housing and a connecting seat disposed within the housing. The connecting seat is connected to the tubular body, and the connecting seat can drive the tubular body to move axially relative to the housing. A limiting portion is provided within the housing, and a plurality of sound - generating regions are provided on the inner wall of the limiting portion. The sound - generating regions include a plurality of teeth arranged in sequence along the axial direction; the connecting seat further includes an elastic piece extending from the inside to the outside, and the free end of the elastic piece can abut against and slide along the sound - generating region under the drive of the connecting seat

[0047] In this embodiment, in addition to the sound - prompting function, the design of the elastic piece 213 also has an additional locking effect. For details, refer to Figures 5-6 , Figure 5 which is a schematic diagram of the working state of the conveying device in Embodiment 1 of the present invention; Figure 6 is Figure 5 an enlarged schematic diagram of region C in Figure 5 which is a simplified diagram after simplifying other structures in the cross - sectional schematic diagram of this embodiment, aiming to illustrate its working principle and not representing that other unshown components need to be omitted.

[0048] In this embodiment, along the path where the sound - generating region 151 extends axially, the limiting portion 150 includes at least one circumferentially - extending limiting groove 152 distributed at intervals, and the width of the limiting groove 152 is greater than the width of the free end of the elastic piece 213. When the free end of the elastic piece 213 reaches the position of the limiting groove 152, the elastic piece 213 naturally rebounds, and the free end of the elastic piece 213 snaps into the limiting groove 152, thereby realizing the clamping connection between the elastic piece 213 and the limiting portion 150. Subsequently, the connecting seat 211 is limited on the limiting portion 150, and then the outer tube 210 is fixed relative to the housing 110, that is, the relative position between the outer tube 210 and the inner tube 220 is locked.

[0049] In this embodiment, in order to limit the elastic piece 213 as much as possible, the limiting groove 152 penetrates through the limiting portion 150.

[0050] In this embodiment, along the axial direction, the limiting portion 150 includes a plurality of limiting grooves 152. When the elastic piece 213 reaches the first limiting groove 152 distributed from the distal end to the proximal end, it corresponds to the end point of the preparation stage of the release stage, and the subsequent limiting grooves 152 respectively correspond to the end points of different release stages.

[0051] In another embodiment, a certain stage can also be split into more sub - stages to obtain a more stable release - process operation.

[0052] In this embodiment, a clamping member 153 is provided outside the corresponding limiting groove 152. One end of the clamping member 153 is fixed inside the housing 210, and the other end is a free end. In the case of no external force (natural condition), the free end of the clamping member 153 extends from the outside to near the mouth of the limiting groove 152 or into the mouth. A switch 154 is connected to the outside of the clamping member 153. One end of the switch 154 extends out of the surface of the housing 210 for operation, and the other end is connected to the housing 210 via a spring (not shown in the figure). The movement of the switch 154 drives the free end of the clamping member 153 to rotate relative to the fixed end of the clamping member 153. That is, when the switch 154 is pressed, the free end of the clamping member 153 is driven to extend into the limiting groove 152. If the elastic piece 213 is snapped into the limiting groove 152 from the inside at this time, the clamping member 153 will push the free end of the elastic piece 213 out of the limiting groove 152, thereby unlocking the horizontal movement of the connecting seat 211.

[0053] In this embodiment, the clamping member 153 is elastic.

[0054] In another embodiment, one end of the clamping member 153 is rotatably connected to the housing 210, and the other end can rotate around the housing 210.

[0055] In another embodiment, when no external force is applied, when the elastic piece 213 extends into the limiting groove 152 from the inside of the inner plate 140 toward the outside, it will also push out the clamping member 153, thereby driving the switch 154 to reset. Therefore, the spring is not an essential component of the switch 154.

[0056] For this embodiment, the design of the elastic piece 213 and the sound generating area 151 not only realizes the sound prompt but also realizes an additional locking effect while providing the sound prompt.

[0057] Embodiment 2

[0058] The improvement of Embodiment 2 compared with Embodiment 1 is mainly the improvement in the way of realizing locking. Specifically, refer to Figures 7-8 , Figure 7 which is the working schematic diagram of the conveying device in Embodiment 2 of the present invention; Figure 8 which is Figure 7 the enlarged schematic diagram of area D in

[0059] In this embodiment, the free end of the elastic piece 213 includes a protruding portion 2131 extending outward, and a groove 2132 is provided on the outer side of the protruding portion 2131 and is inclined inward (i.e., the side close to the axis). A plurality of grooves 2132 can be provided, or they can be provided individually. For the groove 2132, with reference to the center line 2133 in the axial direction of the protruding portion 2131, the open end of the groove 2132 is located on the side away from the center line 2133 and the axis of the closed end. Correspondingly, a positioning member 2134 that can match the groove 2132 extends obliquely toward the center line 2133 and the axis on the inner wall of the limiting groove 152. The reason for such a setting is that the protruding portion 2131 moves from the inner side to the outer side of the housing 210 of the conveying device and is snapped into the limiting groove 152. Thus, the groove 2132 can naturally accommodate the positioning member 2134 along the movement direction of the protruding portion 2131, thereby driving the locking of the elastic piece 213. When it needs to be unlocked, the design of the clamping member and the switch in Embodiment 1 (such as Figures 5-6 the clamping member 153 and the switch 154 in

[0060] Embodiment 3

[0061] The improvement of Embodiment 3 compared with Embodiment 1 is mainly the improvement in the way of realizing locking. Specifically, refer to Figures 9-10 , Figure 9 which is the working schematic diagram of the conveying device in Embodiment 3 of the present invention; Figure 10 is Figure 9 the enlarged schematic diagram of area E in Figures 5-6In the design of the card component 153 and the switch 154), the free end of the elastic piece 213 is pushed out towards the inner side under the pressure from the outside (i.e., from the outside to the inside, away from the axis), and the free end of the elastic piece 213 drives the adjacent part 2231 to freely disengage from the contact with the proximal tooth 1521, thereby realizing the free unlocking of the elastic piece 213 in the horizontal direction.

[0062] It should be noted that the technical features of the above-described embodiments can be combined arbitrarily, and can also be applied to various types of instruments described above at the same time. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0063] The above-described embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A conveying device, characterized in that, It includes a handle and a tubular body. The handle includes a housing and a connecting seat disposed inside the housing. The connecting seat connects the tubular body, and the connecting seat can drive the tubular body to move axially relative to the housing. A limiting portion is provided inside the housing, and several sound - generating regions are provided on the inner wall of the limiting portion. The sound - generating regions include a plurality of teeth arranged in sequence along the axis; the connecting seat further includes a resilient piece extending from the inside to the outside, and the free end of the resilient piece can abut against and slide along the sound - generating region under the drive of the connecting seat.

2. The conveying device according to claim 1, characterized in that, The tooth density and average tooth height of the sound - generating region at the proximal - most position are both greater than those of the sound - generating region at the distal - most position; or, the tooth density of the proximal - most region of the sound - generating region is greater than the tooth density of the distal - most region of the sound - generating region.

3. The conveying device according to claim 1, characterized in that, The average tooth height of the sound - generating region at the proximal - most position is greater than the average tooth height of the sound - generating region at the distal - most position; or, the average tooth height of the proximal - most region of the sound - generating region is greater than the average tooth height of the distal - most region of the sound - generating region.

4. The conveying device according to claim 1, characterized in that The resilient piece extends from the proximal end towards the distal end.

5. The conveying device according to claim 1, characterized in that, An inner plate is provided inside the housing. A first thread - mating portion is provided on the inner wall of the inner plate. The outside of the connecting seat facing the inner plate includes at least one second thread - mating portion. The second thread - mating portion mates with the first thread - mating portion and can move along the first thread - mating portion. Rotating the inner plate can drive the connecting seat to move axially. The limiting portion is located inside the inner plate and is fixedly connected to the housing. The limiting groove is provided with a slot extending axially. The second thread - mating portion and the first thread - mating portion cooperate with each other through the slot.

6. The conveying device according to claim 5, characterized in that, The limiting portion includes several limiting grooves. When the free end of the resilient piece reaches the position of the limiting groove, the free end of the resilient piece can be snapped into the limiting groove.

7. The conveying device according to claim 6, wherein The limiting groove penetrates the limiting portion in the radial direction.

8. The conveying device according to claim 7, wherein The handle includes a clamping member. In a natural state, one end of the clamping member is connected to the housing, and the other end extends from the outside of the limiting portion to near the mouth of the limiting groove or extends into the mouth of the limiting groove.

9. The conveying device according to claim 8, wherein One end of the clamping member is rotatably connected to the housing, and the other end can rotate around the housing.

10. The conveying device according to any one of claims 8-9, characterized in that, It further includes a switch. One end of the switch is connected to the clamping member, and the other end extends out of the housing surface. The switch can drive the free end of the clamping member to extend into the mouth.

11. The conveying device according to claim 6, wherein, The free end of the resilient piece includes a protruding portion extending towards the outside. A groove is provided on the outside of the protruding portion, which is inclined towards the inside. Positioning members corresponding to the groove extend from the inner wall of the limiting groove towards the mid - line and the axis in an inclined manner.

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