CN111374815A

CN111374815A - Conveyor

Info

Publication number: CN111374815A
Application number: CN201811641103.0A
Authority: CN
Inventors: 谢惠雄; 江巍; 周文峰
Original assignee: Shenzhen Xianjian Changtong Medical Co ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-07-07
Anticipated expiration: 2038-12-29
Also published as: CN111374815B

Abstract

The invention relates to a conveyor, which comprises an inner core pipe and a guide rod, wherein the inner core pipe penetrates through the guide rod, the conveyor also comprises a hollow fixed block sleeved on the inner core pipe and a hollow fixed sleeve connected with the near end of the guide rod, the near end of the inner core pipe penetrates out of the near end of the fixed sleeve through the fixed block, the fixed block is detachably connected with the fixed sleeve and can axially move relatively, and the fixed block moving relative to the fixed sleeve drives the inner core pipe to move towards the near end of the conveyor. The conveyor can solve the problem of early release of the implant, and does not influence the insertion of the guide wire from the proximal end of the conveyor.

Description

Conveyor

Technical Field

The invention relates to the technical field of interventional medical instruments, in particular to a conveyor for conveying and releasing implants such as stents and the like.

Background

At present, most of the inner core tubes used by the delivery devices are made of materials with higher rigidity, such as stainless steel tubes, and the like, so that the sheath tube part of the delivery device, especially the lumen stent loading part, becomes very hard, the compliance of the sheath tube part on the sheath tube becomes extremely poor when the delivery device passes through a bent blood vessel, and the risk of puncturing the arterial blood vessel by the distal end part of the delivery device exists. In order to solve the problem, an inner core tube made of a polymer material with relatively good flexibility can be adopted to replace an inner core tube made of a stainless steel tube, so that the compliance of the sheath tube at the position of a bent blood vessel is improved.

However, the inner core tube made of polymer tubing is stretched significantly when the sheath tube abuts against the TIP head, and at this time, since the position of the anchor is unchanged, the TIP head moves a distance towards the distal end along with the inner core tube and is separated from the anchor, the proximal end of the lumen stent falls off from the anchor, and the lumen stent and other implants are released in advance when the stent has not yet reached the ideal position, which affects the normal performance of the surgery and the success of the surgery.

Disclosure of Invention

Therefore, a new conveyor is needed to be provided for the problem that the conveyor can release the implant in advance due to the inner core tube made of the high polymer material.

The utility model provides a conveyer, includes inner core pipe and guide arm, the inner core pipe runs through the guide arm, the conveyer still is located including the cover hollow fixed block on the inner core pipe and with the hollow fixed cover that the guide arm near-end links to each other, the near-end warp of inner core pipe the fixed block is worn out the near-end of fixed cover, the fixed block with fixed cover can be dismantled to be connected and can carry out axial displacement relatively, and is relative fixed cover removes the fixed block drives the inner core pipe moves towards the conveyer near-end.

In one embodiment, the conveyor further comprises a hollow stopper, and when the stopper is positioned at the proximal end or inside the fixed block, the fixed block can drive the inner core tube to move towards the proximal end.

In one embodiment, the fixing block includes a central hole penetrating through distal and proximal ends of the fixing block, and the stopper has a maximum outer diameter greater than a proximal diameter and/or a distal diameter of the central hole.

In one embodiment, the maximum outer diameter of the stopper is greater than the distal diameter of the central bore and less than the proximal diameter of the central bore.

In one embodiment, the fixing block and the fixing sleeve are provided with threads, and the fixing block is connected with or separated from the fixing sleeve through the threads.

In one embodiment, the fixing block and the fixing sleeve are respectively provided with flexible sawteeth, and the fixing block is connected with the fixing sleeve through the sawteeth.

In one embodiment, a hollow fixing ring is arranged between the guide rod and the fixing sleeve, the fixing ring is connected with the proximal end of the guide rod, and the fixing block is accommodated in a cavity communicated with the fixing ring and the fixing sleeve.

In one embodiment, the proximal end of the fixed block and the distal end of the fixing sleeve are connected by a screw thread, and the fixed block moves axially toward the proximal end along the inner core tube when the fixing sleeve rotates circumferentially around the inner core tube.

In one embodiment, the distal end surface of the fixing block is provided with at least one first opening.

In one embodiment, the distal end surface of the fixing sleeve is provided with more than two second openings, the proximal end of the guide rod is connected with more than two connecting rods, and the more than two connecting rods are respectively inserted into the more than two second openings correspondingly to connect the guide rod and the fixing sleeve.

In one embodiment, the distal end surface of the fixing ring is provided with more than two third openings, the proximal end of the guide rod is connected with more than two connecting rods, and the more than two connecting rods are respectively inserted into the more than two third openings correspondingly to connect the guide rod and the fixing ring.

Among the above-mentioned conveyer, the near-end at the guide arm is equipped with fixed cover, fixed cover can dismantle with the cavity fixed block of locating on the inner core pipe and be connected, the fixed block can carry out axial displacement along the inner core pipe to fixed cover relatively, and when the fixed block moved towards the near-end, can drive the inner core pipe and move towards the near-end of conveyer together, thereby can be taut along the axial of conveyer with the inner core pipe, avoid when sheath pipe butt TIP head because the inner core pipe is by axial stretch and make the near-end of official cavity support drop from the anchor, therefore can solve the official cavity support release problem in advance that current conveyer exists, ensure going on smoothly of operation.

Drawings

FIG. 1 is a schematic view of the overall appearance of a conveyor according to embodiment 1;

FIG. 2 is an enlarged view of the structure of part A in FIG. 1;

fig. 3 is a schematic view of the pouch of fig. 1;

fig. 4 is a cross-sectional view of the harness of fig. 3;

FIG. 5 is a schematic structural view of the fixing block of FIG. 2;

FIG. 6 is a cross-sectional view of the fixing block of FIG. 5;

FIG. 7 is a partial schematic structural view of a conveyor according to embodiment 1;

FIG. 8 is a schematic view of the stopper of FIG. 7;

FIG. 9 is another schematic view of the structure of the holding sleeve of the conveyor of embodiment 1;

fig. 10 is another structural schematic view of a fixing block of the conveyor of embodiment 1;

fig. 11 is a schematic structural view of the fixing sleeve in fig. 9 engaged with the fixing block in fig. 10;

FIG. 12 is an enlarged schematic view of the structure of part A of the conveyor of embodiment 2;

FIG. 13 is a schematic view of the retaining ring of FIG. 12;

FIG. 14 is a schematic structural view of the fixing block of FIG. 12;

fig. 15 is a schematic view of the pouch of fig. 12.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the field of interventional medical devices, the end of a medical device implanted in a human or animal body closer to an operator is generally referred to as the "proximal end", the end farther from the operator is referred to as the "distal end", and the "proximal end" and the "distal end" of any component of the medical device are defined according to this principle. "axial" generally refers to the length of the medical device as it is being delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines both "axial" and "radial" directions for any component of the medical device in accordance with this principle.

The technical solution of the present invention will be described in further detail with reference to specific examples.

Example 1

Embodiment 1 provides a conveyor 100, referring to fig. 1 and fig. 2, the conveyor 100 includes a hollow inner core tube 111, a hollow outer core tube 112, a hollow push rod 113, and a hollow sheath tube 114, which are sequentially sleeved from inside to outside, and further includes a fixed handle 115, a guide rod 116 (the guide rod 116 includes a guide rod end 117 at a proximal end thereof), and a sliding handle 118 sleeved on the guide rod 116, wherein the inner core tube 111 is made of a polymer material, for example, a polymer material such as a polyether block polyamide tube, a polyimide tube, etc., without limitation, and has better flexibility and greater deformability than the inner core tube 111 made of a metal tube, that is, the inner core tube 111 made of a polymer tube is more easily axially elongated. The distal end of the inner core tube 111 is connected to a hollow TIP 110, and the distal end of the outer core tube 112 is connected to a tie-down anchor 119. The lumen of the inner core tube 111 communicates with the lumen of the TIP head 110 to serve as a guide wire channel. The outer core tube 112 is sleeved outside the inner core tube 111 and can axially move relative to the inner core tube 111, and the fixing anchor 119 can axially move along with the outer core tube 112. The TIP head 110 is provided with a fixation anchor retaining groove, and the fixation anchor 119 is detachably connected in the fixation anchor retaining groove. The push rod 113 is sleeved outside the outer core tube 112 and is located between the outer core tube 112 and the sheath tube 114, and the sheath tube 114 is sleeved outside the push rod 113 and can move axially relative to the push rod 113. The fixed handle 115 is fixedly connected with the distal end of the guide rod 116, and the sliding handle 118 is sleeved on the guide rod 116 and can move axially along the guide rod 116. The proximal end of the push rod 113 is connected to the guide rod tip 117, the proximal end of the sheath 114 is fixed inside the sliding handle 118, and the sheath 114 is axially movable with the sliding handle 118.

When the sheath 114 axially moves towards the far end and is sleeved outside the outer core tube 112, an annular cavity is formed between the sheath 114 and the outer core tube 112, the compressed lumen stent is accommodated in the annular cavity, the bare stent at one end of the lumen stent is hooked on the fixed anchor 119, and the other end of the lumen stent abuts against the far end face of the push rod 113, so that the lumen stent is positioned between the fixed anchor 119 and the push rod 113 after being axially compressed. Since the stent-graft is entirely constrained in the sheath 114, the stent-graft and the transporter 100 can be kept in a relatively stationary state before reaching the lesion site, and when the transporter 100 loaded with the stent-graft reaches the lesion site, the release of the stent-graft is controlled by sliding the handle 118. The luminal stent can be released from the delivery device 100 when the sheath 114 is axially moved proximally to at least flush with the distal end of the push rod 113, while the end of the luminal stent having the bare stent remains constrained to the fixation anchor 119.

The near end of the guide rod end 117 is connected with two connecting rods 120, an outer core tube connecting piece 121 is sleeved on each connecting rod 120, the near end of the outer core tube 112 is connected to the outer core tube connecting piece 121, and the outer core tube connecting piece 121 is moved axially, so that the axial movement of the outer core tube 112 can be controlled. When the outer core tube coupler 121 is moved proximally, the anchor 119 is also moved proximally with the outer core tube 112, at which point the bare stent can be released from the anchor 119, thereby releasing the luminal stent completely.

In addition, referring to fig. 1 and fig. 2 together, the conveyor 100 further includes a hollow fixing block 130, a hollow stop member 140 and a hollow fixing sleeve 150 respectively sleeved on the inner core tube 111, the fixing sleeve 150 is connected to the proximal end of the guide rod end 117 through two connecting rods 120, the fixing block 130 is closer to the distal end than the fixing sleeve 150, the stop member 140 is located between the fixing block 130 and the fixing sleeve 150 and is used for preventing the fixing block 130 from moving towards the proximal end of the inner core tube 111 along the inner core tube 111, that is, when the fixing block 130 moves towards the proximal end along the inner core tube 111 and abuts against the stop member 140, the fixing block 130 drives the stop member 140 and the inner core tube 111 to move towards the proximal end together, and the fixing.

The proximal end of the inner core tube 111 protrudes from the proximal end of the hub 150 so that the guide wire can extend into the lumen of the inner core tube 111 through the proximal end of the hub 150, and the hub 150, which is open at the proximal end, has a strength so as not to be easily deformed, and thus, does not hinder the insertion of the guide wire from the proximal end of the hub 150. Referring to fig. 1, 3 and 4, the fixing sleeve 150 is tubular, and has two openings 151 at its distal end, and the two connecting rods 120 are inserted into the two openings 151, respectively, so as to connect the guide rod tip 117 and the fixing sleeve 150 together. Referring to fig. 2 again, the outer diameter of the fixing sleeve 150 is larger than the outer diameter of the fixing block 130, the diameter of the proximal opening of the fixing sleeve 150 is smaller than the diameter of the distal opening thereof, the diameter of the cavity of the fixing sleeve 150 is equal to the diameter of the distal opening thereof, and the diameter of the cavity of the fixing sleeve 150 is equal to the outer diameter of the fixing block 130, so that when the fixing sleeve 150 is connected with the fixing block 130, the cavity of the fixing sleeve 150 can accommodate and be connected with the fixing block 130. The inner wall of the fixing sleeve 150 is provided with internal threads, the outer wall of the fixing block 130 is provided with external threads, and the fixing block 130 is connected with or separated from the fixing sleeve 150 through threads. Further, a water injection pipe 152 is further provided at the proximal end of the fixing sleeve 150, the cavity of the water injection pipe 152 is communicated with the cavity of the fixing sleeve 150, and a liquid such as physiological saline can be injected into the cavity of the conveyor 100 through the proximal end of the water injection pipe 152, so as to clean the interior of the conveyor 100.

Referring to fig. 5 and 6, the fixing block 130 is tubular and includes a central hole 131 penetrating the distal end and the proximal end of the fixing block 130, and the diameter of the central hole 131 is slightly larger than the outer diameter of the inner core tube 111. Further, the distal end surface of the fixing block 130 is provided with at least one opening 132 for allowing an operator to rotate the fixing block 130 by means of some auxiliary tools, thereby coupling or decoupling the fixing block 130 to or from the fixing sleeve 150.

Referring to fig. 7 and 8, the stopper 140 is fixed to the inner core tube 111, and the cross section thereof may be in a regular shape such as a circle, a square, a triangle, a polygon, or an irregular shape. The maximum outer diameter of the stopper 140 is larger than the proximal end diameter and/or the distal end diameter of the central hole 131 as long as the stopper 140 does not pass through at least one end of the fixing block 130, thereby preventing the fixing block 130 from moving toward the proximal end of the core tube 111 along the core tube 111, and thus, when the fixing block 130 moves toward the proximal end along the core tube 111 and abuts against the stopper 140, the fixing block 130 will bring the stopper 140 and the core tube 111 together to move toward the proximal end. In this embodiment, the maximum outer diameter of the stopper 140 is larger than the proximal end diameter of the central bore 131. In another embodiment, the maximum outer diameter of the stopper 140 is greater than the distal diameter of the central bore 131 and less than the proximal diameter of the central bore 131, and the stopper 140 may be located inside the fixation block 130 when the fixation block 130 is coupled with the fixation sleeve 150.

The stop member 140 may be formed from a small section of rigid material with a large inner diameter and a moderate thickness (e.g., stainless steel tubing) or a soft material with a moderate hardness (e.g., polyether block polyamide tubing), and may be secured to the inner core tube 111 by gluing or the like. Further, in order to improve the stability of the stopper 140 during the use process, a section of polyether block polyamide tube with low melting point and flexible material with large inner diameter and moderate thickness can be welded to the inner core tube 111 by melting. In addition, when the inner core tube 111 is manufactured, a step is directly arranged on the inner core tube 111 to serve as the stop member 140, so that the stability of the stop member 140 can be ensured, and the attractiveness and the convenience of assembly of the inner core tube 111 can be improved.

When the fixing block 130 is coupled to the fixing sleeve 150, the fixing block 130 is rotated to move toward the proximal end, and the stopper 140 cannot slide out from the inside of the fixing block 130 toward the distal end because the outer diameter of the stopper 140 is larger than the distal end diameter of the central hole 131 of the fixing block 130, at this time, the fixing block 130 drives the stopper 140 to move toward the proximal end until the fixing block 130 is finally fixed to the fixing sleeve 150. Because the stop piece 140 is fixed on the inner core tube 111, the inner core tube 111 moves towards the proximal end for a certain distance along with the fixing block 130, so that the inner core tube 111 can be axially tensioned, and the problem that when the sheath tube abuts against the TIP head 110, the bare stent falls off from the fixed anchor 119 due to the fact that the inner core tube 111 is axially stretched, so that the lumen stent is released in advance is avoided, and smooth operation can be ensured. It can be understood that the fixing block 130 may be moved distally when the fixing block 130 is rotated reversely, so as to reduce the degree of tension of the inner core tube 111, thereby conveniently adjusting the degree of tension of the inner core tube 111 to meet different clinical requirements.

In another embodiment, referring to fig. 9 to 11, the fixing block 130 and the fixing sleeve 150 are respectively provided with flexible saw teeth, and the fixing block 130 is connected with the fixing sleeve 150 through the saw teeth. It can be understood that the thread in embodiment 1 is replaced by a sawtooth, and the structural features of the fixing block 130 and the fixing sleeve 150 adopting the sawtooth connection mode are the same as those of the fixing block 130 and the fixing sleeve 150 adopting the thread connection mode in embodiment 1, and are not described again here.

It will be appreciated that in other embodiments, the above-mentioned conveyor 100 may not be provided with the stop member 140, but the fixing block 130 may be fixed to the proximal end of the inner core tube 111 by means of an adhesive or a hot melt, so that the fixing block 130 can still drive the inner core tube 111 to move towards the proximal end, so as to tighten the inner core tube 111, making it difficult to be axially stretched, thereby avoiding the problem of premature release of the lumen stent.

Example 2

The same parts of the conveyor of embodiment 2 as those of the conveyor 100 of embodiment 1 are not described again, but the difference between them is mainly that, in embodiment 2, referring to fig. 12, a hollow fixing ring 260 is disposed between the proximal end of the guide rod tip and the distal end of the fixing sleeve 250, the fixing ring 260 is sleeved on the inner core tube 211, the fixing ring 260 is connected to the proximal end of the guide rod tip, the fixing block 230 is accommodated in a cavity where the fixing ring 260 and the fixing sleeve 250 are communicated, the proximal end of the fixing block 230 is connected to the distal end of the fixing sleeve 250 through a thread, and when the fixing sleeve 250 rotates circumferentially around the inner core tube 211, the fixing block 230 moves axially towards the proximal end along the inner.

Referring to fig. 12 and 13, the fixing ring 260 is hollow, the inner core tube 211 can penetrate through the circular cavity of the fixing ring 260, two openings 261 are formed on the distal end surface of the fixing ring 260, and the two connecting rods 220 on the end of the guide rod are inserted into the two openings 261, respectively, so as to connect the end of the guide rod and the fixing ring 260 together. The cavity diameter of the fixing ring 260 is larger than the outer diameter of the fixing block 230, so that the fixing block 230 can be accommodated in the cavity of the fixing ring 260. Referring to fig. 14, the fixing block 230 is a cylindrical tube including a central hole 231 penetrating through the proximal and distal ends thereof, and the diameter of the central hole 231 is slightly larger than the outer diameter of the inner core tube 211. The outer wall of the fixing block 230 is provided with threads. Referring to fig. 15, the fixing sheath 250 is hollow and has two open ends, the inner wall is provided with threads, the diameter of the proximal opening of the fixing sheath 250 is smaller than the diameter of the distal opening but larger than the outer diameter of the inner core tube 211, and the diameter of the cavity of the fixing sheath 250 is equal to the diameter of the distal opening thereof, so that the cavity of the fixing sheath 250 can accommodate the fixing block 230 and be in threaded connection therewith.

Referring to fig. 12 again, in the initial position, the fixing ring 260 is adjacent to the fixing sleeve 250 and the cavity is communicated, most of the fixing block 230 is located in the cavity of the fixing ring 260, and a small portion of the fixing block 230 located at the proximal end is in threaded connection with the fixing sleeve 250. The fixing sleeve 250 is rotated in the circumferential direction to move the fixing block 230 toward the proximal end, and the stopper 240 located at the proximal end of the fixing block 230 cannot slide out from the proximal end of the fixing block 230 toward the distal end because the outer diameter of the stopper 240 is larger than the proximal diameter of the central hole 231 of the fixing block 230, and at this time, the fixing block 230 drives the stopper 240 to move toward the proximal end. Because the stop member 240 is fixed on the inner core tube 211, the inner core tube 211 can move towards the proximal end for a certain distance along with the fixing block 230, so that the inner core tube 211 which can be elongated in the axial direction can be tensioned, the bare stent of the lumen stent is difficult to be separated from the fixing anchor, the lumen stent can be ensured not to be released in advance, and the smooth operation can be ensured. It can be understood that the fixing sleeve 250 is rotated in the opposite direction to drive the fixing block 230 to move towards the distal end, so as to reduce the degree of tightening the inner core tube 211, thereby conveniently adjusting the degree of tightening the inner core tube 211 to meet different clinical requirements.

In the conveyor 100 of embodiment 1, since the fixed block 130 has a small volume and the distal end portion of the fixed block 130 is positioned between the two connection rods 120, it is inconvenient for the operator to rotate the fixed block 130 to tighten the inner core tube 111. Compared with the conveyor 100 of the embodiment 1, the conveyor of the embodiment 2 drives the fixing block 230 to move towards the proximal end by rotating the fixing sleeve 250, so as to tighten the inner core tube 211, and the fixing sleeve 250 is located at the proximal end of the conveyor and is not blocked by components such as the connecting rod 220, so that the control operation is convenient, the use of an operator is convenient, the use difficulty of the conveyor is reduced, and the operation time can be saved.

Further, an annular slide groove may be disposed on the proximal end surface of the fixing ring 260, and a slider protruding toward the distal end may be disposed on the distal end surface of the fixing ring 250, and when the fixing ring 250 abuts against the fixing ring 260, the slider is at least partially received in the slide groove and causes the fixing ring 260 to be engaged with the fixing ring 250, and may move in the slide groove along the circumferential direction of the fixing ring 260. The concrete shape of the chute is not limited as long as the chute comprises an annular groove, the shape of the slide block is not limited as long as the far end of the slide block extends into the chute and the fixing ring 260 is clamped with the fixing sleeve 250, so that the fixing sleeve 250 cannot fall off from the conveyor when rotating in the circumferential direction. It is understood that the sliding slot may be disposed on the distal end surface of the fixing sheath 250, and the slider may be disposed on the proximal end surface of the fixing loop 260, and the slider may be at least partially received in the sliding slot to allow the fixing loop 260 to be engaged with the fixing sheath 250 and move in the sliding slot along the circumferential direction of the fixing sheath 250.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a conveyer, includes inner core pipe and guide arm, the inner core pipe runs through the guide arm, its characterized in that, the conveyer still including the cover locate hollow fixed block on the inner core pipe and with the hollow fixed cover that the guide arm near-end links to each other, the near-end warp of inner core pipe the fixed block is worn out the near-end of fixed cover, the fixed block with fixed cover can be dismantled to be connected and can carry out axial displacement relatively, and is relative fixed cover removal the fixed block drives the inner core pipe is towards the conveyer near-end removal.

2. The conveyor according to claim 1, further comprising a hollow stop, said stop being adapted to move said inner core tube proximally when said stop is located at or within a proximal end of said fixed block.

3. Conveyor according to claim 2, characterized in that the fixed block comprises a central hole through the distal and proximal ends of the fixed block, the maximum outer diameter of the stop being greater than the proximal and/or distal diameter of the central hole.

4. A conveyor according to claim 3, characterized in that the maximum outer diameter of said stop is greater than the distal diameter of said central hole and less than the proximal diameter of said central hole.

5. The conveyor according to claim 1, characterized in that said fixing block and said fixing sleeve are provided with threads, said fixing block being connected to or separated from said fixing sleeve by means of threads.

6. The conveyor according to claim 1, characterized in that said fixed block and said fixed sleeve are provided with flexible saw teeth, said fixed block and said fixed sleeve being connected by saw teeth.

7. The conveyor according to claim 1, characterized in that a hollow fixing ring is provided between said guide rod and said fixing sleeve, said fixing ring being connected to said proximal end of said guide rod, said fixing block being housed in a cavity communicating said fixing ring and said fixing sleeve.

8. The conveyor of claim 7 wherein the proximal end of said anchor block and the distal end of said retaining sleeve are threadably connected, said anchor block axially moving proximally along said inner core tube as said retaining sleeve circumferentially rotates about said inner core tube.

9. A conveyor apparatus according to claim 1, wherein the fixing block is provided with at least one first opening on a distal end face thereof.

10. The conveyor according to claim 1, wherein said distal end surface of said fixed sleeve is provided with more than two second openings, said guide rod is connected to said proximal end thereof with more than two connecting rods, and said more than two connecting rods are respectively inserted into said more than two second openings to connect said guide rod and said fixed sleeve.

11. The conveyor according to claim 7, wherein the distal end surface of the fixing ring is provided with more than two third openings, the proximal end of the guide rod is connected with more than two connecting rods, and the more than two connecting rods are respectively inserted into the more than two third openings to connect the guide rod and the fixing ring.