A conveying system with a locking mechanism

Abstract

The present application relates to a delivery system with a locking mechanism, comprising an outer sheath and a handle fixedly connected to the proximal portion of the outer sheath, the handle comprising a locking mechanism and a driving mechanism, the locking mechanism comprising a front shell and a locking component assembled to the front shell, the driving mechanism comprising a knob, a screw, a slider and a slide rail, the rotation of the knob being able to drive the driving mechanism to achieve a release function of the delivery system, a positioning hole being provided on the distal end surface of the knob, the locking component being mated with the positioning hole to achieve the locking function of the delivery system. The locking / unlocking process of the delivery system only requires pulling the handheld movable part of the locking component once, without the need for continuous pressing, making control more convenient and the number of cyclic locking / unlocking times higher and more reliable.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a delivery system with a locking mechanism. Background Art

[0002] The stent delivery system is an auxiliary device used to deliver stents to diseased areas of the human body during interventional treatment. During the packaging, transportation, or storage of the delivery system, premature release of the delivery system due to vibration, falling, etc. will render the product unusable. During use, sometimes the stent needs to be suspended after being partially released. If the stent is released prematurely due to the doctor's accidental touch of the drive system during the pause or when it is not delivered to the designated position, the surgical risk will increase. In order to reduce the risk of use, the existing technology prevents the position of the components of the delivery system from changing by increasing the release resistance of the delivery system, or adds anti-mistouch components to reduce the premature release of the delivery system caused by misoperation or accidental touch during transportation.

[0003] For example, a patent from Boston Scientific Thermed (Patent Publication No.: CN 103298433A) discloses a locking component for use with a stent delivery system. The release mechanism is in the form of a thumb wheel, which a doctor can actuate to release the stent. The locking component and the actuating component (thumb wheel) are wrapped to prevent accidental actuation of the thumb wheel. The locking component makes it generally difficult for the doctor to access the actuating component, thereby preventing unnecessary actuation of the actuating component. The locking component can also provide significant resistance when the outer tube of the system is accidentally pulled. The drawback of this technology is that it relies on friction and an anti-accidental actuation method, and cannot completely prevent the movement of the release mechanism, leaving the possibility of movement. Summary of the Invention

[0004] In order to overcome the defects in the prior art, the purpose of the present invention is to design a conveying system with a locking mechanism, so that the operation of the conveying system is smoother and safer.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A delivery system with a locking mechanism comprises an outer sheath and a handle fixedly connected to the proximal portion of the outer sheath, the handle comprising a locking mechanism and a driving mechanism, the locking mechanism comprising a front shell and a locking component assembled to the front shell, the driving mechanism comprising a knob, a screw, a slider and a slide rail, the rotation of the knob can drive the driving mechanism to realize the release function of the delivery system, a positioning hole is provided on the distal surface of the knob, and the locking component cooperates with the positioning hole to realize the locking function of the delivery system.

[0007] The purpose of the present invention can be further achieved by the following technical solutions:

[0008] In one embodiment, a slot is provided on the front housing, the locking component is assembled in the slot, and the length of the slot defines a moving range of the locking component.

[0009] In one embodiment, the handle further includes a rear shell, the knob is arranged between the front shell and the rear shell, the distal surface of the knob is in contact with the proximal surface of the front shell, a through hole is provided on the proximal surface of the front shell, and the position of the through hole corresponds to that of the positioning hole along the axial direction of the handle.

[0010] In a preferred embodiment, a plurality of positioning holes with the same aperture are equidistantly provided on the distal end surface of the knob along the circumferential direction, and when the delivery system is in a locked state, the position of the through hole corresponds to that of at least one of the positioning holes along the axial direction of the handle.

[0011] In a more preferred embodiment, the locking component includes a handheld movable part and a positioning pin, and the positioning pin is fixedly connected to the handheld movable part. The movement of the handheld movable part can drive the positioning pin to pass through the through hole and the positioning hole to achieve locking of the knob.

[0012] In a more preferred embodiment, the positioning pin is fixedly connected to the bottom of the handheld mobile member.

[0013] In a more preferred embodiment, the positioning pin is "L"-shaped, and a bottom hole is provided in the middle of the handheld movable part. A straight section of the "L"-shaped structure of the positioning pin is fixed in the bottom hole, and another straight section of the "L"-shaped structure of the positioning pin is used to be inserted into the positioning hole to realize the locking function of the conveying system.

[0014] In a more preferred embodiment, a table-shaped protrusion is provided on the top of the handheld movable member, and the table-shaped protrusion is located on the outside of the front shell to facilitate operation by a doctor.

[0015] In a more preferred embodiment, a conical protrusion is provided on the table-shaped protrusion to increase friction and facilitate the doctor's operation.

[0016] In a preferred embodiment, a first limiting groove and a second limiting groove are provided on the side of the handheld movable member, and a limiting member is provided in the front shell, and the limiting member is composed of a shell, a spring provided in the shell and a limiting bead fixedly connected to one end of the spring. When the locking member moves toward the distal end, the limiting bead of the limiting member is inserted into the first limiting groove, the positioning pin is retracted into the front shell, and the driving mechanism is unlocked; when the locking member moves toward the proximal end, the limiting bead of the limiting member is inserted into the second limiting groove, the positioning pin extends out of the through hole of the front shell and is inserted into the positioning hole, and the driving mechanism is locked.

[0017] In a preferred embodiment, a first limiting groove and a second limiting groove are respectively provided on two side surfaces of the hand-held movable member, and two limiting members are provided in the front shell, and the two limiting members are respectively provided corresponding to the two side surfaces, and the limiting member is composed of a shell, a spring provided in the shell and a limiting bead fixedly connected to one end of the spring. When the locking member moves toward the distal end, the limiting bead of the limiting member located on one side of the hand-held movable member is snapped into the first limiting groove on the same side, the positioning pin is retracted into the front shell, and the driving mechanism is unlocked; when the locking member moves toward the proximal end, the limiting bead of the limiting member located on the other side of the hand-held movable member is snapped into the second limiting groove on the same side, the positioning pin extends out of the through hole of the front shell and is inserted into the positioning hole, and the driving mechanism is locked.

[0018] In a preferred embodiment, the screw is assembled into the rear shell, the distal end of the screw is fixedly connected to the knob and rotates synchronously with the knob, and an internal thread is provided on the screw; the slide rail is provided in the rear shell, the proximal end of the slide rail is fixedly connected to the rear shell, and the distal end of the slide rail is fixedly connected to the front shell via a connecting shaft, the slider is sleeved on the slide rail, and an external thread is provided on the slider, and the external thread cooperates with the internal thread, and the proximal end of the outer sheath tube is fixedly connected to the slider through the hole provided on the connecting shaft, and when the knob is rotated to drive the screw to rotate, the slider moves along the axis of the handle on the slide rail, thereby driving the outer sheath tube to move.

[0019] In a preferred embodiment, the pitch settings of the external thread and the internal thread and the number of positioning holes of the knob are adjustable. By adjusting the pitch of the above-mentioned thread and the number of positioning holes, higher control accuracy can be achieved. For example, markings corresponding to the positioning holes are set on the outer surface of the knob. When the pitch P is set to 10 mm and the number of positioning holes is set to 20, the distance the outer sheath moves for each angle corresponding to the rotation of the knob is 10÷360°×20°≈0.56 (mm). When the doctor needs to operate the delivery system to release a certain distance, precise positioning can be performed through the knob markings. When the release needs to be paused, it is only necessary to pull the handheld movable part to insert the positioning pin into the positioning hole, and other operations such as patient observation or injection of contrast agent can be performed without affecting the release state of the stent.

[0020] In one embodiment, an inner tube assembly is disposed within the outer sheath, and the proximal end of the inner tube assembly passes through the handle and is fixedly connected to a Luer connector.

[0021] In one embodiment, a stress diffusion tube is provided at the connection between the distal end of the front shell and the outer sheath tube.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The delivery system of the present invention does not rely on friction to lock the drive mechanism, but locks the knob by inserting a positioning pin into a positioning hole. Therefore, when there is no need to release, the knob can be completely locked to prevent the outer sheath from moving unexpectedly due to the rotation of the knob. The locking / unlocking process only requires pulling the handheld moving part of the locking component once, without continuous pressing, making the control more convenient and the number of cyclic locking / unlocking times higher and more reliable.

[0024] 2. The present invention locks the knob by inserting the positioning pin into the positioning hole, so that the two relative movement directions of the outer sheath are restricted. When the delivery system is locked, the external force will act on the locking mechanism, and the force will not be transmitted to the catheter assembly, and will not cause damage to the catheter assembly.

[0025] 3. The delivery system of the present invention is easy to operate. When locked, the knob cannot be turned even if the torque is increased, and it is completely locked. When released, the locking mechanism is separated from the driving mechanism and no additional resistance is provided. The outer sheath can be driven to move and the instrument can be released by rotating the knob with the thumb. Moreover, the operator can hold the rear shell still with his hand, that is, there is no need to rotate the hand, so the operation is smoother and safer.

[0026] 4. The present invention provides a slot on the front housing, and the locking component is assembled in the slot. The length of the slot can limit the movement range of the locking component, control the depth of the positioning pin inserted into the positioning hole of the knob, and further control the locking force.

[0027] 5. The locking component of the present invention is also provided with a limiter, which can limit the release position and the locking position of the locking component to prevent accidental movement of the locking component, provide two-level locking protection for the conveying system, and make the operation safer and more reliable.

[0028] 6. The present invention can adjust the pitch of the thread and the number of positioning holes to achieve higher control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view of the overall structure of the conveying system of the present invention.

[0030] Figure 2 It is a cross-sectional schematic diagram of the overall structure of the conveying system of the present invention.

[0031] Figure 3 It is a schematic diagram of the exploded structure of the conveying system of the present invention.

[0032] Figure 4a-4d It is a structural schematic diagram of the locking mechanism of the conveying system of the present invention.

[0033] Figure 5 It is a schematic structural diagram of the proximal end surface of the front shell of the present invention.

[0034] Figure 6 It is a schematic diagram of the distal end structure of the knob of the present invention.

[0035] Figure 7a-7e It is a partial structural diagram of the locking mechanism and the driving mechanism when the conveying system of the present invention is in a locked state.

[0036] Figure 8a-8e It is a partial structural diagram of the locking mechanism and the driving mechanism when the conveying system of the present invention is in an unlocked state.

[0037] Figure 9a Schematic diagram of the structure of the knob of the present invention having multiple positioning holes provided on the distal end surface. Figure 9b It is a schematic diagram of an implementation method of the knob and the locking mechanism being cooperatively connected.

[0038] Figure 10a and Figure 10b It is a structural schematic diagram of the limiting member of the present invention.

[0039] Figure 11a It is a partial structural diagram of the locking mechanism of the present invention. Figure 11b yes Figure 11a Right view, Figure 11c yes Figure 11a The left view of Figure 11b and Figure 11c It is shown that a limit groove is provided on the handheld moving part.

[0040] Figure 12 It is a partial structural diagram of the locking mechanism when the conveying system of the present invention is in an unlocked state.

[0041] Figure 13 It is a partial structural diagram of the locking mechanism when the conveying system of the present invention is in a locked state. DETAILED DESCRIPTION

[0042] The technical solution of the present invention and the advantages thereof are further described in detail below with reference to the accompanying drawings and specific embodiments. Components in the accompanying drawings are not necessarily drawn to scale, and the focus is on illustrating the concept of the present invention.

[0043] In various specific embodiments of the present invention, well-known structures or materials involved therein are not described in detail. In addition, those skilled in the art should understand that the following various embodiments are only for illustration and are not intended to limit the scope of protection of the present invention.

[0044] Before describing the specific embodiments of the present invention in detail, the terms involved in the present invention are explained as follows:

[0045] “Proximal end” refers to the end closer to the operator, and “distal end” refers to the end farther from the operator.

[0046] Example 1

[0047] like Figure 1 、 Figure 2 and Figure 3 As shown, a delivery system with a locking mechanism includes an outer sheath 1 and a handle 2 fixedly connected to the proximal portion of the outer sheath 1, the handle 2 includes a locking mechanism 3 and a driving mechanism 4, the locking mechanism 3 includes a front shell 31 and a locking component 32 assembled to the front shell 31, the driving mechanism 4 includes a knob 41, a screw 42, a slider 43 and a slide rail 44, and the rotation of the knob 41 can drive the driving mechanism 4 to realize the release function of the delivery system, as shown in FIG. Figure 6 As shown, a positioning hole 411 is provided on the distal end surface of the knob 41 , and the locking component 32 is connected in cooperation with the positioning hole 411 to realize the locking function of the delivery system.

[0048] like Figure 3 As shown, a slot 312 is provided on the front housing 31, and the locking member 32 is assembled in the slot 312. The length L of the slot 312 defines the moving range of the locking member 32. The handle 2 further includes a rear housing 21, and the knob 41 is provided between the front housing 31 and the rear housing 21, with the distal end surface of the knob 41 in contact with the proximal end surface of the front housing 31. Figure 5 As shown, a through hole 311 is provided on the proximal end surface of the front shell 31 , and the positions of the through hole 311 and the positioning hole 411 correspond to each other along the axial direction of the handle 2 .

[0049] like Figure 4a-4d As shown, the locking component 32 includes a handheld movable member 321 and a positioning pin 322 fixedly connected to the handheld movable member 321. The movement of the handheld movable member 321 can drive the positioning pin 322 to pass through the through hole 311 and the positioning hole 411, thereby achieving the locking of the knob 41. That is, the locking component 32 is connected in cooperation with the positioning hole 411 to achieve the locking function of the conveying system. In one embodiment, the positioning pin is fixedly connected to the bottom of the handheld movable member. In a more preferred embodiment, the positioning pin is "L"-shaped, and a bottom hole is provided in the middle of the handheld movable member. A straight section of the "L"-shaped structure of the positioning pin is fixed in the bottom hole, and another straight section of the "L"-shaped structure of the positioning pin is used to be inserted into the positioning hole to achieve the locking function of the conveying system.

[0050] like Figure 2 and Figure 3 As shown, the driving mechanism 4 includes a knob 41, a screw 42, a slider 43 and a slide rail 44, and the screw 42 is assembled in the rear shell 21, and the distal end of the screw 42 is fixedly connected to the knob 41 and rotates synchronously with the knob 41, and an internal thread is provided on the screw 42; the slide rail 44 is arranged in the rear shell 21, and the proximal end of the slide rail 44 is fixedly connected to the rear shell 21, and the distal end of the slide rail 44 is fixedly connected to the front shell 31 through the connecting shaft 5, and the slider 43 is sleeved on the slide rail 44, and an external thread is provided on the slider 43, and the external thread cooperates with the internal thread, and the proximal end of the outer sheath tube 1 passes through the hole 51 set on the connecting shaft 5 and is fixedly connected to the slider 43. When the knob 41 is rotated to drive the screw 42 to rotate, the slider 43 moves along the axis of the handle on the slide rail 44, thereby driving the outer sheath tube 1 to move.

[0051] In one embodiment, an inner tube assembly 6 is disposed within the outer sheath 1 , and a proximal end of the inner tube assembly 6 passes through the handle 2 and is fixedly connected to a Luer connector 7 .

[0052] In one embodiment, a stress diffusion tube is provided at the connection between the distal end of the front shell 31 and the outer sheath tube 1 .

[0053] The conveying system of the present invention does not rely on friction to lock the driving mechanism 3, but locks the knob 41 by inserting the positioning pin 322 into the limiting hole 411. Figure 7a-7dAs shown, when there is no need to release, the through hole provided on the proximal end surface of the front housing 31 corresponds to the positioning hole provided on the distal end surface of the knob 41 along the axial position of the handle 2. Therefore, when the handheld movable member 321 is pushed along the slot 312, the handheld movable member 321 drives the positioning pin 322 to move, first passing through the through hole and then entering the positioning hole, as shown in FIG. Figure 7a-7e As shown, the length of the positioning pin displacement can be controlled by the length L of the slot 321, thereby controlling the locking depth. In this way, when there is no need to release, the knob can be completely locked to prevent the outer sheath from moving unexpectedly due to the rotation of the knob; Figure 8a-8e As shown, the locking / unlocking process only requires pulling the handheld movable member 321 of the locking component once, and moving the handheld movable member 321 toward the distal end along the slot 312. The handheld movable member 321 drives the positioning pin 322 to move, withdraw from the positioning hole, and then return to the front shell. This process does not require continuous pressing, making the control more convenient and the number of cyclic locking / unlocking times higher and more reliable.

[0054] Example 2

[0055] The difference between this embodiment and the first embodiment is that: Figure 11a-Figure 11c As shown, in order to prevent the locking part from accidentally sliding in the unlocking / locking state, a first limiting groove 323 and a second limiting groove 324 are provided on the side of the handheld movable part 321. A limiting member 313 is provided in the front housing 31, as shown in FIG. Figure 10a and Figure 10b As shown, the limiting member 313 is composed of a shell 3131, a spring 3132 disposed in the shell 3131, and a limiting bead 3133 fixedly connected to one end of the spring. When the spring 3132 is not subjected to external force, the limiting bead 3133 is ejected by the spring 3132. When the spring 3132 is squeezed by external force, the limiting bead 3133 retracts into the shell. Figure 13 As shown, when the locking component moves toward the proximal end, the limiting bead 3133 of the limiting member 313 is inserted into the first limiting groove 323, the positioning pin 322 extends out of the through hole 311 of the front shell 32 and is inserted into the positioning hole 411, and the driving mechanism 32 is locked; Figure 12 As shown, when the locking component moves toward the distal end, the limiting bead 3133 of the limiting member 313 is locked into the second limiting groove 324, the positioning pin 322 is retracted into the front housing 31, and the driving mechanism 32 is unlocked.

[0056] In a preferred embodiment, a first limiting groove 323 and a second limiting groove 324 are respectively provided on two side surfaces of the hand-held movable member 321, and two limiting members 313 are provided in the front shell 32, and the two limiting members 313 are respectively provided corresponding to the two side surfaces. When the locking member moves toward the distal end, the limiting bead 3133 of the limiting member 313 located on one side of the hand-held movable member 321 is snapped into the second limiting groove 324 on the corresponding side, the positioning pin 322 is retracted into the front shell 32, and the driving mechanism is unlocked; when the locking member moves toward the proximal end, the limiting bead 3133 of the limiting member 313 located on the other side of the hand-held movable member is snapped into the first limiting groove 323 on the corresponding side, the positioning pin 322 extends out of the through hole 322 of the front shell 32 and is inserted into the positioning hole 411, and the driving mechanism 32 is locked. Of course, those skilled in the art can adopt other limiting methods to further limit the release position and locking position of the locking component to prevent accidental movement of the locking component, provide two-level locking protection for the conveying system, and make the operation of the conveying system safer and more reliable.

[0057] Example 3

[0058] The difference between this embodiment and the first embodiment is that: Figure 9a and Figure 9b As shown, in one embodiment, a plurality of positioning holes 411 with the same aperture are equidistantly provided on the distal end surface of the knob 41 along the circumferential direction. The advantage is that the positioning is more accurate. When the doctor operates the handle to release the stent, the stent release can be paused at any time according to the patient's condition. The knob position can be aligned with the positioning pin without excessive adjustment to lock the stent release state. In a preferred embodiment, the pitch of the external thread and the internal thread and the number of positioning holes of the knob are adjustable. By adjusting the pitch of the above-mentioned thread and the number of positioning holes, higher control accuracy can be achieved. For example, a marking corresponding to the positioning hole is provided on the outer surface of the knob. When the pitch P is set to 10 mm and the number of positioning holes is set to 20, the angle corresponding to each marking line rotated by the knob is 10÷360°×20°≈0.56 (mm). When the doctor needs to operate the delivery system to release a certain distance, the knob marking can be used for precise positioning. When the release needs to be paused, it is only necessary to turn the handheld moving part to insert the positioning pin into the positioning hole, and then other operations such as patient observation or contrast agent injection can be carried out without affecting the release state of the stent.

[0059] In one embodiment, Figure 11a-Figure 11cAs shown, a table-shaped protrusion 3211 is provided at the top of the handheld movable member 321. The table-shaped protrusion 3211 extends out of the slot 312 and is located outside the front housing 31 to facilitate the doctor's pushing of the handheld movable member 321. The positioning pin 322 is fixedly connected to the bottom of the handheld movable member 321. In a preferred embodiment, a conical protrusion 3212 is provided at the distal end of the table-shaped protrusion 3211 of the handheld movable member 321 to increase the pushing force. In a preferred embodiment, a striped protrusion 3213 is provided on the upper surface of the table-shaped protrusion 3211 of the handheld movable member 321 to increase the friction force.

[0060] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A delivery system with a locking mechanism, comprising an outer sheath and a handle fixedly connected to the proximal end of the outer sheath, characterized in that: The handle includes a locking mechanism and a driving mechanism, the locking mechanism including a front shell and a locking component assembled to the front shell, the driving mechanism including a knob, a screw, a slider and a slide rail, the rotation of the knob can drive the driving mechanism to realize the release function of the conveying system, a positioning hole is provided on the distal end surface of the knob, the handle also includes a rear shell, the knob is arranged between the front shell and the rear shell, the distal end surface of the knob is abutted against the proximal end surface of the front shell, and a through hole is provided on the proximal end surface of the front shell, the position of the through hole and the positioning hole corresponds to the axial direction of the handle, the locking component includes a handheld movable part and a positioning pin, the positioning pin is fixedly connected to the handheld movable part, the movement of the handheld movable part can drive the positioning pin to pass through the through hole and the positioning hole, and the locking component cooperates with the positioning hole to realize the release function of the conveying system. The locking function of the conveying system is that a slot is provided on the front shell, and the locking component is assembled in the slot, and the length of the slot limits the moving range of the locking component, and the screw is assembled in the rear shell, and the distal end of the screw is fixedly connected to the knob and rotates synchronously with the knob, and an internal thread is provided on the screw; the slide rail is provided in the rear shell, and the proximal end of the slide rail is fixedly connected to the rear shell, and the distal end of the slide rail is fixedly connected to the front shell through a connecting shaft, and the slider is sleeved on the slide rail, and an external thread is provided on the slider, and the external thread cooperates with the internal thread, and the proximal end of the outer sheath tube is fixedly connected to the slider through the hole provided on the connecting shaft, and when the knob is rotated to drive the screw to rotate, the slider moves along the axis of the handle on the slide rail, thereby driving the outer sheath tube to move.

2. The conveying system with a locking mechanism according to claim 1, characterized in that: A plurality of positioning holes with the same aperture are equidistantly arranged on the distal end surface of the knob along the circumferential direction. When the delivery system is in a locked state, the position of the through hole corresponds to that of at least one of the positioning holes along the axial direction of the handle.

3. The conveying system with a locking mechanism according to claim 1, characterized in that: The positioning pin is fixedly connected to the bottom of the handheld moving member.

4. The conveying system with a locking mechanism according to claim 3, characterized in that: The positioning pin is "L"-shaped, and a bottom hole is provided in the middle of the handheld movable part. A straight section of the "L"-shaped structure of the positioning pin is fixed in the bottom hole, and the other straight section of the "L"-shaped structure of the positioning pin is used to be inserted into the positioning hole to realize the locking function of the conveying system.

5. The conveying system with a locking mechanism according to claim 1, characterized in that: A first limiting groove and a second limiting groove are provided on the side of the handheld movable member, and a limiting member is provided in the front shell, which consists of a shell, a spring provided in the shell and a limiting bead fixedly connected to one end of the spring. When the locking member moves toward the distal end, the limiting bead of the limiting member is inserted into the first limiting groove, the positioning pin is retracted into the front shell, and the driving mechanism is unlocked; when the locking member moves toward the proximal end, the limiting bead of the limiting member is inserted into the second limiting groove, the positioning pin extends out of the through hole of the front shell and is inserted into the positioning hole, and the driving mechanism is locked.

6. The conveying system with a locking mechanism according to claim 1, characterized in that: A first limiting groove and a second limiting groove are respectively provided on two side surfaces of the hand-held movable member, and two limiting members are provided in the front shell, and the two limiting members are respectively provided corresponding to the two side surfaces, and the limiting member is composed of a shell, a spring provided in the shell and a limiting bead fixedly connected to one end of the spring. When the locking member moves toward the distal end, the limiting bead of the limiting member on one side of the hand-held movable member is snapped into the first limiting groove on the same side, the positioning pin is retracted into the front shell, and the driving mechanism is unlocked; when the locking member moves toward the proximal end, the limiting bead of the limiting member on the other side of the hand-held movable member is snapped into the second limiting groove on the same side, the positioning pin extends out of the through hole of the front shell and is inserted into the positioning hole, and the driving mechanism is locked.

7. The conveying system with a locking mechanism according to claim 1, characterized in that: The pitch of the external thread and the internal thread and the number of the positioning holes of the knob can be adjusted.

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