Telescopic sheath tube assembly with small inner diameter

Abstract

A telescopic sheath tube assembly with a small inner diameter, comprising a telescopic sheath tube (103302), different sections of the telescopic sheath tube being coaxially sleeved stage by stage, and the section with the largest diameter and the section with the smallest diameter being respectively fixed on corresponding external modules, such that the telescopic sheath tube is extended or shortened along with the change of the distance between the two external modules. Axial limitation of the telescopic sheath tube is realized by means of a first limiting structure provided on the outer side of a tube body of the telescopic sheath tube, so as to prevent the sections of the telescopic sheath tube from being completely separated. The first limiting structure is one of a pull rope structure, a limiting telescopic sheath tube, a pull rod structure, a connection rod structure and a corrugated tube structure, or is a combination thereof. Since the limiting structure of the telescopic sheath tube is located on the outer side of the tube body, the difference between the inner diameters of the different sections of the telescopic sheath tube can be very small, so that more sections can be provided under the condition of a limited maximum inner diameter, so as to enable the telescopic sheath tube to have a larger telescopic range, and ensure that interventional consumables do not bend inside the telescopic sheath tube, thereby achieving a straight-line guidance effect.

Description

[Corrected 11.02.2025 according to Rule 26] A telescopic sleeve assembly with a small inner diameter Technical Field

[0001] The present invention relates to the technical field of interventional robots, and in particular to a telescopic sleeve assembly with a thin inner diameter. Background Art

[0002] Vascular interventional procedures primarily include femoral / radial artery puncture, coordinated advancement of a guidewire and angiography catheter, digital subtraction angiography (DSA), coordinated advancement of a therapeutic guidewire and balloon catheter, and stent placement. The coordinated advancement of the guidewire, catheter, and balloon catheter is a time-consuming step in these procedures and requires X-ray image navigation. Currently, vascular interventional procedures are typically performed manually by surgeons. During the procedure, DSA emits X-rays, requiring surgeons to wear heavy lead aprons. This rapidly degrades surgeons' stamina, concentration, and stability, leading to decreased precision and a high risk of life-threatening accidents such as intimal damage and vascular perforation and rupture caused by improper thrust. Furthermore, prolonged wear of lead aprons can damage the surgeon's spine. Furthermore, the cumulative damage from long-term ionizing radiation exposure significantly increases the surgeon's risk of leukemia, cancer, and acute cataracts. Therefore, to ensure surgeons' health and surgical quality, research and development of interventional surgical robots is intensifying, and a growing number of robots are now being used in clinical practice.

[0003] The path of the catheter or guidewire during extracorporeal delivery is a significant factor hindering the operation of endovascular interventional surgical robots. During the process of the interventional surgical robot driving the catheter or guidewire for delivery, friction can easily cause the extracorporeal portion of the catheter or guidewire to bend and deform, preventing successful delivery.

[0004] Currently, some interventional surgical robots use a telescopic tube guidance system. The catheter passes through the telescopic tube, and the inner wall of the telescopic tube limits the catheter, which effectively prevents the catheter from bending and ensures smooth delivery. However, with this design, the telescopic tube still has a long length after being fully retracted, which reduces the effective length of the catheter. At the same time, existing technologies all set limits inside the telescopic tube (to prevent the different sections of the telescopic tube from being completely pulled out and separated). This results in a large difference in the outer diameter of the different sections of the telescopic tube. After the sections are connected step by step, the inner diameter of the section with the largest outer diameter of the telescopic tube is also very large. For interventional consumables, the inner diameter of the telescopic tube needs to be controlled within a reasonable range, otherwise the interventional consumables will easily bend inside the telescopic tube.

[0005] The prior art patent application number CN202322183919.6 discloses a vascular interventional surgical robot and a consumable anti-bending device thereof. The consumable anti-bending device includes a guide member and a forward member. A channel is formed inside the guide member, and an opening is provided on the outer periphery of the guide member. The forward member is used to maintain the orientation of the opening in a preset direction. Based on this invention, the interventional consumable moves along the extension direction of the channel under the constraint of the guide member to prevent the interventional consumable from bending. In addition, when the interventional consumable moves forward or backward, the interventional consumable can pass through the opening to detach from or get stuck in the channel, thereby reducing the restriction of the guide member on the movement distance of the interventional consumable and increasing the effective use length of the interventional consumable. In addition, during the movement of the interventional consumable, the forward member can maintain the orientation of the opening to ensure that the interventional consumable can smoothly enter the interior of the channel and ensure the delivery effect of the interventional consumable. The guide member of the prior art does not have a telescopic function. The guide member only constrains the interventional consumable, and an opening is provided on the guide member. The interventional consumable can pass through the opening to detach from or get stuck in the channel. This will cause the interventional consumable and the guide member to be at risk of detachment during use of the present invention, so that the guide member will not play its role. Therefore, it is necessary to improve the prior art so that the guide member has a telescopic function and a larger telescopic stroke, and has an internal channel that matches the outer diameter of the interventional consumable, so as to increase the effective use length of the interventional consumable.

[0006] Summary of the Invention

[0007] In order to solve the above-mentioned existing technical problems, defects and unattainable technical requirements, the purpose of the present invention is to provide a telescopic sleeve assembly with a thin inner diameter. The telescopic sleeve can guide the interventional consumable to remain straight during the movement of the interventional consumable. By setting a limit on the outside rather than the inside of the telescopic tube, the outer diameter difference between different sections of the telescopic tube is minimized as much as possible, and the number of sections of the telescopic tube is increased as much as possible when the maximum outer diameter is limited. The length of the telescopic tube after being fully shortened is less than 150 mm, thereby increasing the effective use length of the interventional consumable and ensuring the transportation effect of the interventional consumable.

[0008] The technical solution adopted by the present invention to achieve its invention object is:

[0009] A telescopic sleeve assembly with a thin inner diameter includes a telescopic sleeve, wherein different sections of the telescopic sleeve are coaxially connected in stages; the section with the largest diameter and the section with the smallest diameter are respectively fixed to corresponding external modules, and the telescopic sleeve is stretched or shortened as the distance between the two external modules changes; the telescopic sleeve is axially limited by a first limiting structure provided on the outside of the tube body of the telescopic sleeve, thereby preventing different sections in the telescopic sleeve from completely separating.

[0010] Preferably, the first limiting structure is one or a combination of a pull rope structure, a limiting telescopic sleeve, a pull rod structure, a connecting rod structure, and a bellows structure. The outer diameters of the different sections of the telescopic sleeve decrease in size, the difference in outer diameters between adjacent sections of the telescopic sleeve is less than 0.8 mm, and the wall thickness of each section is less than 0.4 mm.

[0011] Preferably, each section or several sections of the telescopic sleeve are provided with a connecting portion, and except for the section with the largest diameter on the telescopic sleeve, the connecting portions of other sections on the telescopic sleeve are arranged at the head end of the section.

[0012] Preferably, when two adjacent sections of the telescopic sleeve gradually contract, the connecting parts of the two adjacent sections abut against each other, or the connecting part of the previous section abuts against the end face of the next section, thereby preventing the previous section of the telescopic sleeve from being completely inserted into the next section; the connecting part is a connecting block, and a first through hole is provided at the position where each section of the telescopic sleeve is connected to the connecting block, and a second through hole is provided on the connecting block, and a protrusion is provided on the inner side of the hole wall of the second through hole. When the second through hole of the connecting block cooperates with each section of the telescopic sleeve, the protrusion of the connecting block extends into the first through hole to achieve the limitation between this section of the telescopic sleeve and the corresponding connecting block, and an abutting part is provided on the protrusion, and the abutting part extends into the first through hole and abuts against the next section of the telescopic sleeve. The abutting part has a certain elasticity and can produce a friction damping effect with the next section of the telescopic sleeve, thereby achieving a sliding damping effect between different sections of the telescopic sleeve.

[0013] Preferably, when the telescopic sleeve adopts a pull rope structure or a bellows structure for limiting the position, a limiting pull rope or a limiting bellows is connected between the connecting parts of the two adjacent sections of the telescopic sleeve. While the two adjacent sections of the telescopic sleeve are gradually pulled apart, the limiting pull rope is also gradually straightened, or the wrinkled part of the limiting bellows is also gradually straightened. When the limiting pull rope is completely straightened, or the wrinkled part of the limiting bellows is completely straightened, the different sections in the telescopic sleeve can be prevented from completely separating.

[0014] Preferably, when the telescopic sleeve is limited by a position-limiting telescopic sleeve, the connecting portion is a connecting block, and a section of the position-limiting telescopic sleeve is provided on the connecting block of each section of the telescopic sleeve parallel to the axis of the telescopic sleeve. When the telescopic sleeves are sleeved step by step, the position-limiting telescopic sleeves are also sleeved step by step, and the position-limiting telescopic sleeves prevent different sections of the position-limiting telescopic sleeves from being completely separated by a second position-limiting structure.

[0015] Preferably, the diameters of different sections of the limiting telescopic sleeve decrease or increase in sequence; a third through hole is provided on the connecting block, and each section of the limiting telescopic sleeve correspondingly passes through the third through hole, wherein the second limiting structure is arranged between the segments of two adjacent limiting telescopic sleeves, and the second limiting structure includes a first limiting portion and a second limiting portion, and the interference cooperation between the first limiting portion and the second limiting portion can prevent the limiting telescopic tubes of different sections from being completely separated, thereby preventing the telescopic tubes of different sections from being completely separated; when the previous section of the limiting telescopic sleeve is inserted into the next section, the first limiting portion is arranged on the front end of the inner wall of the next section of the limiting telescopic sleeve, and the second limiting portion is arranged on the rear end of the outer wall of the previous section of the limiting telescopic sleeve, through the front and rear limiting action of the first limiting portion and the second limiting portion, the limiting telescopic sleeve slides back and forth in the third through hole of the connecting block, thereby limiting the movement of different sections of the telescopic sleeve.

[0016] Preferably, when the telescopic sleeve is axially limited by a pull rod structure, the pull rod structure includes a guide rod, the connecting part is a connecting block, and a first guide hole is provided on the connecting block on each section of the telescopic sleeve. One end of the guide rod is connected to the connecting block on the previous section of the telescopic sleeve, and the other end of the guide rod passes through the first guide hole on the connecting block on this section of the telescopic sleeve, and adjacent guide rods are staggered and spaced apart in the circumferential direction of the telescopic sleeve, and all guide rods are arranged around the telescopic sleeve.

[0017] Preferably, a third limiting portion is fixedly provided at the end of the guide rod passing through the first guide hole, and the movement of different sections of the telescopic sleeve is limited by the guide rod sliding back and forth in the first guide hole of the connecting block. When two adjacent sections of the telescopic sleeve are gradually stretched to a certain extent, the third limiting portion abuts against the connecting block on the upper section of the telescopic sleeve, and the third limiting portion prevents the different sections of the telescopic sleeve from being completely separated. The connecting block of each section of the telescopic sleeve can prevent the different sections of the telescopic sleeve from being completely retracted.

[0018] Preferably, when the telescopic sleeve adopts a connecting rod structure for limiting, the connecting part is a connecting block, and a limiting connecting rod assembly is connected between the connecting blocks on the two adjacent sections of the telescopic sleeve. The limiting connecting rod assembly is composed of multiple connecting rods hinged to each other. As the two adjacent sections of the telescopic sleeve are gradually stretched, the multiple connecting rods of the limiting connecting rod assembly that are hinged to each other are also gradually straightened from the bent state. When the limiting connecting rod assembly is fully straightened or pulled to the limiting angle, the different sections in the telescopic sleeve can be prevented from completely separating; the limiting connecting rod assembly includes two first connecting rods and a second connecting rod that are hinged to each other, and the front end of the first connecting rod and the rear end of the second connecting rod are respectively hinged to the connecting blocks on the two adjacent sections of the telescopic sleeve.

[0019] Preferably, the telescopic sleeve has at least 5 sections, and the length of the longest section is less than 150 mm. When the telescopic sleeve is fully shortened, the total length is less than 150 mm. Beneficial effects

[0020] The different sections of the telescopic sleeve of the present invention are coaxially connected in stages, and the telescopic sleeve guides the interventional consumable to maintain a straight state to prevent the interventional consumable from bending. By setting a limit (one or a combination of a pull rope structure, a limit telescopic sleeve, a pull rod structure, a connecting rod structure, and a bellows) on the outside rather than the inside of the telescopic sleeve, the outer diameter difference between the different sections of the telescopic sleeve is minimized as much as possible. When the maximum outer diameter is limited, the number of sections of the telescopic sleeve is increased as much as possible, so that the length of the telescopic sleeve after being fully shortened is less than 150 mm, thereby increasing the effective use length of the interventional consumable and ensuring the transportation effect of the interventional consumable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of Example 1 when the telescopic sleeve adopts a pull rope structure for position limiting;

[0022] FIG2 is a schematic structural diagram of a limit rope connected between connecting blocks on two adjacent sections of Example 1;

[0023] FIG3 is a schematic structural diagram of Example 1 when the telescopic sleeve is limited by a limiting bellows;

[0024] FIG4 is a schematic structural diagram of the telescopic sleeve and the connecting block when the telescopic sleeve is fully retracted according to Example 1;

[0025] FIG5 is a schematic structural diagram of the telescopic sleeve and the connecting block of Example 1;

[0026] FIG6 is a schematic structural diagram of a connection block in Example 1;

[0027] FIG7 is a schematic structural diagram of Example 2 when the telescopic sleeve is limited by a position-limiting telescopic sleeve;

[0028] FIG8 is a front view of Example 2 when the telescopic sleeve is limited by a limiting telescopic sleeve;

[0029] FIG9 is an enlarged structural diagram of point H in FIG7 ;

[0030] FIG10 is a schematic structural diagram of Example 3 when the telescopic sleeve is axially limited by the pull rod structure;

[0031] FIG11 is a schematic structural diagram of the pull rod structure of Example 3;

[0032] FIG12 is a schematic structural diagram of Example 4 when the telescopic sleeve adopts a connecting rod structure to achieve axial limitation. Modes for Carrying Out the Invention

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection, or even a connection that can move relative to each other; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Example 1

[0034] A telescopic sleeve assembly with a thin inner diameter includes a telescopic sleeve 103302, wherein different sections of the telescopic sleeve 103302 are coaxially connected in stages; the section with the largest diameter and the section with the smallest diameter can be fixed on the corresponding external modules respectively, and the telescopic sleeve 103302 is lengthened or shortened as the distance between the two external modules changes. The section with the largest diameter of the telescopic sleeve is installed on the external module at the front end, and the section with the smallest diameter of the telescopic sleeve is installed on the external module at the rear end. When the interventional consumables are delivered, the external module at the rear end moves forward, so that the section with the smaller diameter of the telescopic sleeve moves forward and is inserted into the section with the larger diameter of the telescopic sleeve.

[0035] The telescopic sleeve 103302 is axially restrained by a first retaining structure located on the outside of the tube, preventing the different sections of the telescopic sleeve 103302 from completely disengaging. The first retaining structure can be one or a combination of a pull rope structure, a restraining telescopic sleeve, a pull rod structure, a connecting rod structure, or a bellows structure. The outer diameters of the different sections of the telescopic sleeve 103302 decrease in size. The difference in outer diameter between adjacent sections of the telescopic sleeve 103302 is less than 0.8 mm, and the wall thickness of each section is less than 0.4 mm. Each section or sections of the telescopic sleeve 103302 are equipped with a connecting portion. Except for the section with the largest diameter, the connecting portion of each section is located at the head end of that section.

[0036] When the two adjacent sections of the telescopic sleeve 103302 gradually shrink, the connecting parts of the two adjacent sections abut against each other, or the connecting part of the previous section abuts against the end face of the next section, thereby preventing the previous section of the telescopic sleeve 103302 from being completely inserted into the next section; the connecting part is a connecting block 103302001, and the part where each section of the telescopic sleeve 103302 is connected to the connecting block is provided with a first through hole, and the connecting block is provided with a second through hole, and the inner side of the hole wall of the second through hole is provided with a protrusion, when the second through hole of the connecting block cooperates with each section of the telescopic sleeve 103302, the protrusion of the connecting block extends into the first through hole, thereby realizing the limitation between this section of the telescopic sleeve 103302 and the corresponding connecting block, and the protrusion is provided with an abutting part, which extends into the first through hole and abuts against the next section of the telescopic sleeve 103302, and the abutting part has a certain elasticity and can abut against the telescopic sleeve 103302. The next section produces a friction damping effect, thereby achieving a sliding damping effect between different sections of the telescopic sleeve 103302.

[0037] When the telescopic sleeve 103302 adopts a pull rope structure for limiting the position, a limit pull rope is connected between the connecting parts of the two adjacent sections of the telescopic sleeve 103302. As the two adjacent sections of the telescopic sleeve 103302 are gradually pulled apart, the limit pull rope is also gradually straightened. When the limit pull rope is completely straightened, the different sections in the telescopic sleeve can be prevented from completely separating.

[0038] The telescopic sleeve is provided with at least 5 sections, and the length of the longest section is less than 150 mm. When the telescopic sleeve is fully shortened, the total length is less than 150 mm.

[0039] Specifically, as shown in Figures 1 and 6, the connecting portion is a connecting block 103302001, which includes a left connecting block 103302002 and a right connecting block 103302003. The left connecting block 103302002 and the right connecting block 103302003 are connected and fixed by glue, screws or buckles. The installation is convenient and quick. During the installation process, the left connecting block 103302002 and the right connecting block 103302003 only need to be attached to the outside of the telescopic sleeve 103302 and fixedly connected. In this embodiment, the left connecting block 103302002 and the right connecting block 103302003 are fixed by buckle clamping. Each section of the telescopic sleeve 103302 is provided with a first through hole 103302004 along its radial direction. The connecting block 103302001 A second through hole 103302005 is provided in the axial direction (formed after the left connecting block 103302002 and the right connecting block 103302003 are closed), and a protrusion 103302006 is provided on the inner side of the hole wall of the second through hole 103302005. The protrusion 103302006 is embedded in the first through hole 103302004 provided on different sections of the telescopic sleeve 103302, so as to realize reliable limiting of different sections of the connecting block 103302001 and the telescopic sleeve 103302. The protrusion 103302006 is provided with an abutting portion (not shown in the figure, which is a silicone plug or a rubber plug), which extends into the first through hole 103302004 and abuts against the next section of the telescopic sleeve 103302. The abutting portion has a certain elasticity and can abut against the telescopic sleeve 103302. The next section produces a friction damping effect, thereby achieving a sliding damping effect between different sections of the telescopic sleeve 103302, avoiding arbitrary rotation between different sections of the telescopic sleeve 103302, resulting in circumferential direction disorder and causing the limit rope 103304 to be spirally entangled. The telescopic sleeve assembly adopts a telescopic sleeve 103302 with different sections. At least one pull wire group is arranged on the side of the telescopic sleeve 103302. When there are two or more pull wire groups, each pull wire group is arranged in an array around the telescopic sleeve 103302. Each pull wire group is provided with one or more limiting pull ropes 103304. The end of each section of the telescopic sleeve 103302 is fixedly connected with a connecting block 103302001. The limiting pull rope 103304 is located between two adjacent connecting blocks 103302001. The front and rear ends of the limiting pull rope 103304 are respectively fixedly connected to the corresponding connecting blocks 103302001. The tensioning of the limiting pull rope 103304 prevents the telescopic sleeves 103302 of different sections from being completely detached. Furthermore, the connecting block 103302001 fixedly connected to the head end of each telescopic sleeve 103302 can be used to prevent different sections from being completely retracted.The different sections of the telescopic sleeve 103302 are between completely disengaged and completely retracted.

[0040] As shown in Figure 2, in order to allow for sufficient expansion and compression between different sections of the telescopic sleeve 103302, all the limiting pull ropes 103304 extending from the connecting block 103302001 are perpendicular to the axis of the telescopic sleeve 103302. The limiting pull ropes 103304 can also be replaced by a chain structure. The diameters of different sections of the telescopic sleeve 103302 decrease from front to back. The end of the section of the telescopic sleeve 103302 with the largest diameter is provided with a first connecting block a 10330201, and the end of the limiting pull rope 103304 corresponding to the section of the telescopic sleeve 103302 is fixedly connected to the first connecting block a 10330201, and the first connecting block a 10330201 is locked to the telescopic sleeve locking mechanism of the external module. The end of the section of the telescopic sleeve 103302 with the smallest diameter is provided with a first connecting block b10330202, and the end of the limiting pull rope 103304 corresponding to the section of the telescopic sleeve 103302 is fixedly connected to the first connecting block b10330202, and the first connecting block b10330202 is locked to the telescopic sleeve locking mechanism of the external module.

[0041] As an alternative, when the first limiting structure is a pull rope structure, each section or several sections of the telescopic sleeve 103302 are provided with a protrusion on the outside of the tube body (the protrusion replaces the connecting block), and the protrusion can also achieve axial limitation. At the same time, the limiting pull rope 103304 is connected between the protrusions of two adjacent sections to prevent different sections in the telescopic sleeve 103302 from completely separating.

[0042] As an alternative, as shown in Figure 3, when the telescopic sleeve 103302 adopts a bellows structure for limiting the position, the limiting bellows 10330401 is connected between the connecting parts of the two adjacent sections of the telescopic sleeve 103302. While the two adjacent sections of the telescopic sleeve 103302 are gradually stretched, the folded parts of the limiting bellows 10330401 are also gradually straightened. When the folded parts of the limiting bellows 10330401 are completely straightened, the different sections in the telescopic sleeve can be prevented from completely separating. When the front section of the telescopic sleeve is gradually inserted into the back section, the limiting bellows 10330401 is also gradually folded. Example 2

[0043] The parts of this embodiment that are the same in structure as embodiment 1 are not described in detail. The difference is that when the telescopic sleeve is limited by a position-limiting telescopic sleeve, the connecting portion is a connecting block, and a section of the position-limiting telescopic sleeve is provided on the connecting block of each section of the telescopic sleeve parallel to the axis of the telescopic sleeve. When the telescopic sleeves are sleeved step by step, the position-limiting telescopic sleeves are also sleeved step by step, and the position-limiting telescopic sleeves prevent different sections of the position-limiting telescopic sleeves from being completely separated by a second position-limiting structure.

[0044] The diameters of the different sections of the position-limiting telescopic sleeve decrease or increase in sequence; a third through hole is provided on the connecting block, and each section of the position-limiting telescopic sleeve correspondingly passes through the third through hole, wherein a second position-limiting structure is provided between two adjacent sections of the position-limiting telescopic sleeve, and the second position-limiting structure includes a first position-limiting portion and a second position-limiting portion. The first position-limiting portion and the second position-limiting portion interfere with each other to prevent the position-limiting telescopic sleeves of different sections from completely separating, thereby preventing the telescopic sleeves of different sections from completely separating;

[0045] When the front section of the limiting telescopic sleeve is inserted into the rear section, the first limiting portion is arranged on the front end of the inner wall of the rear section of the limiting telescopic sleeve, and the second limiting portion is arranged on the rear end of the outer wall of the front section of the limiting telescopic sleeve. Through the front and rear limiting action of the first limiting portion and the second limiting portion, the limiting telescopic sleeve slides back and forth in the third through hole of the connecting block, thereby limiting the movement of different sections of the telescopic sleeve.

[0046] Specifically, as shown in Figures 7 to 9, the telescopic sleeve assembly adopts a telescopic sleeve 103302 with different sections. At least one group of limiting telescopic sleeves 103303 is set on the side of the telescopic sleeve 103302. The axial direction of each group of limiting telescopic sleeves 103303 is parallel to the axial direction of the telescopic sleeve 103302. The limiting telescopic sleeve 103303 is formed by mutually socketing segments that become thicker or thinner step by step. The end of each section of the telescopic sleeve 103302 is fixedly connected with a connecting block 103302001. The connecting block 103302001 is provided with a guide hole. Different sections of the limiting telescopic sleeve 103303 are correspondingly passed through and fixed in different guide holes. A limiting structure is provided between the segments of two adjacent limiting telescopic sleeves 103303. When the limiting telescopic sleeve 103303 When the segment located on the front side is sleeved on the segment located on the rear side, a first limiting portion 103303001 is provided on the rear end inner wall of the limiting telescopic sleeve 103303 located on the front side, and a second limiting portion 103303002 is provided on the front end outer wall of the limiting telescopic sleeve 103303 located on the rear side. The limiting telescopic sleeve 103303 slides back and forth in the guide hole of the connecting block 103302001 to limit the movement of the telescopic sleeves 103302 of different sections. The interference cooperation between the first limiting portion 103303001 and the second limiting portion 103303002 can prevent the limiting telescopic sleeves 103303 of different sections from completely detaching, thereby preventing the telescopic sleeves 103302 of different sections from completely detaching. The connection blocks 103302001 fixedly connected to the ends of each telescopic sleeve 103302 can be used to prevent the different sections from being completely retracted. The different sections of the telescopic sleeve 103302 are between completely disengaged and completely retracted.

[0047] Since the limiting structures of the telescopic sleeve 103302 are all on the outside of its tube body, there is no need to make a limiting mechanism inside the tube body of the telescopic sleeve 103302. Therefore, the inner diameter difference between different sections of the telescopic sleeve 103302 can be very small. Preferably, the outer diameter difference between two adjacent sections in the telescopic sleeve is less than 0.8mm, and the wall thickness of each section is less than 0.4mm. In this way, more levels can be set when the maximum inner diameter is limited, so that the telescopic sleeve 103302 has a larger telescopic stroke. Because an inner diameter that is too large will cause the interventional consumables to bend inside it, which is not conducive to a linear guiding effect.

[0048] The diameters of different sections of the telescopic sleeve 103302 decrease from front to back. The end of the section of the telescopic sleeve 103302 with the largest diameter is provided with a first connecting block a10330201, and the first connecting block a 10330201 is locked on the telescopic sleeve locking mechanism of the external module located at the front side of the interventional consumables delivery direction. The end of the section of the telescopic sleeve 103302 with the smallest diameter is provided with a first connecting block b 10330202, and the first connecting block b10330202 is locked on the telescopic sleeve locking mechanism of the external module located at the back side of the interventional consumables delivery direction.

[0049] The diameters of the different sections of the position-limiting telescopic sleeves 103303 decrease or increase (preferably decrease) from front to back. The ends of the position-limiting telescopic sleeves 103303 at the front and rear ends are respectively fixed to the first connecting block a 10330201 or the first connecting block b 10330202. Multiple groups of the position-limiting telescopic sleeves 103303 can also be provided and arranged circumferentially around the telescopic sleeve 103302. Example 3

[0050] The parts of this embodiment that are the same as those in embodiment 1 are not described in detail. The difference is that when the telescopic sleeve is axially limited by a pull rod structure, the pull rod structure includes a guide rod, and the connecting portion is a connecting block. A first guide hole is provided on the connecting block on each section of the telescopic sleeve, and one end of the guide rod is connected to the connecting block on the previous section of the telescopic sleeve, and the other end of the guide rod passes through the first guide hole on the connecting block on this section of the telescopic sleeve, and adjacent guide rods are staggered and spaced apart in the circumferential direction of the telescopic sleeve, and all guide rods are arranged around the telescopic sleeve.

[0051] The end of the guide rod passing through the first guide hole is fixedly provided with a third limiting portion, and the guide rod slides back and forth in the first guide hole of the connecting block to limit the movement of different sections of the telescopic sleeve. When the telescopic sleeve is extended or retracted, the segment behind the telescopic sleeve is contracted and inserted into the adjacent front section of the telescopic sleeve, and gradually extends and retracts from back to front. When the telescopic sleeve is stretched, when the two adjacent sections of the telescopic sleeve are gradually stretched to a certain extent, the third limiting portion abuts against the connecting block on the upper section of the telescopic sleeve, and the different sections of the telescopic sleeve are prevented from being completely separated by the third limiting portion. The connecting block of each section of the telescopic sleeve can prevent the different sections of the telescopic sleeve from being completely retracted.

[0052] Specifically, as shown in Figures 10 and 11, the head end of each section of the telescopic sleeve 103302 is fixedly connected to a connecting block 103302001, and a guide hole is provided on the connecting block 103302001. A guide rod 1033020011 passes through the guide hole. One end of the guide rod is connected to or abuts against the connecting block on one section of the telescopic sleeve 103302, and the other end 1033020011 of the guide rod passes through the guide hole of the connecting block 103302001 on another adjacent section of the telescopic sleeve 103302. A limiting portion 1033020012 is fixedly provided at the end of the guide rod 1033020011 that passes through the guide hole. By sliding the guide rod 1033020011 back and forth in the guide hole of the connecting block 103302001, the telescopic sleeves 103302 of different sections can be adjusted. The telescopic sleeve 103302 is limited in its movement, with the stopper 1033020012 preventing the different sections of the telescopic sleeve 103302 from completely disengaging. Furthermore, the connecting block 103302001 fixedly connected to the head end of each section prevents the sections from completely retracting. The different sections of the telescopic sleeve 103302 are positioned between completely disengaged and completely retracted. Because the stopper structures of the telescopic sleeve 103302 are all located outside the tube body, there is no need for a stopper within the tube body. Therefore, the difference in inner diameter between the different sections of the telescopic sleeve 103302 can be very small. Preferably, the difference in outer diameter between adjacent sections of the telescopic sleeve is less than 0.8 mm, and the wall thickness of each section is less than 0.4 mm. This allows for more stages to be provided even when the maximum inner diameter is limited (because an excessively large inner diameter can cause the interventional consumable to bend within it, hindering linear guidance). This allows for a greater telescopic travel of the telescopic sleeve 103302. Example 4

[0053] The structures of this embodiment are the same as those of embodiment 1 and will not be described in detail. The differences are as follows:

[0054] As shown in Figure 12, when the telescopic sleeve adopts a connecting rod structure for position limiting, the connecting part is a connecting block, and a limiting connecting rod assembly is connected between the connecting blocks 103302001 on the two adjacent sections of the telescopic sleeve 103302. The limiting connecting rod assembly is composed of multiple connecting rods hinged to each other. As the two adjacent sections of the telescopic sleeve are gradually stretched, the multiple hinged connecting rods of the limiting connecting rod assembly are also gradually straightened from the bent state. When the limiting connecting rod assembly is fully straightened or stretched to the limiting angle (in this case, an angle limiting structure must be added to the limiting connecting rod assembly), the different sections in the telescopic sleeve can be prevented from completely separating. The limiting connecting rod assembly includes two mutually hinged first connecting rods 10330501 and second connecting rods 10330502, and the front end of the first connecting rod and the rear end of the second connecting rod are respectively hinged to the connecting blocks 103302001 on the two adjacent sections of the telescopic sleeve.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0056] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A telescopic sleeve assembly with a thin inner diameter, characterized by: The invention comprises a telescopic sleeve, wherein different sections of the telescopic sleeve are coaxially connected step by step; the section with the largest diameter and the section with the smallest diameter can be fixed on corresponding external modules respectively, and the telescopic sleeve is stretched or shortened as the distance between the two external modules changes; the telescopic sleeve is axially limited by a first limiting structure arranged on the outside of the tube body of the telescopic sleeve, thereby preventing different sections in the telescopic sleeve from being completely separated.

2. The telescopic sleeve assembly with a thin inner diameter according to claim 1, characterized in that: The first limiting structure is one or a combination of a pull rope structure, a limiting telescopic sleeve, a pull rod structure, a connecting rod structure, and a bellows structure; the outer diameters of different sections of the telescopic sleeve decrease successively, and the difference in outer diameters between two adjacent sections in the telescopic sleeve is less than 0.8 mm, and the wall thickness of each section is less than 0.4 mm.

3. The telescopic sleeve assembly with a thin inner diameter according to claim 1, characterized in that: Each section or several sections of the telescopic sleeve are provided with a connecting portion. Except for the section with the largest diameter on the telescopic sleeve, the connecting portions of the other sections on the telescopic sleeve are arranged at the head end of the section.

4. The telescopic sleeve assembly with a thin inner diameter according to claim 3, characterized in that: When two adjacent sections of the telescopic sleeve gradually shrink, the connecting parts of the two adjacent sections abut against each other, or the connecting part of the previous section abuts against the end face of the next section, thereby preventing the previous section of the telescopic sleeve from being completely inserted into the next section; the connecting part is a connecting block, and a first through hole is provided at the position where each section of the telescopic sleeve is connected to the connecting block, and a second through hole is provided on the connecting block, and a protrusion is provided on the inner side of the hole wall of the second through hole. When the second through hole of the connecting block cooperates with each section of the telescopic sleeve, the protrusion of the connecting block extends into the first through hole to achieve the limitation between this section of the telescopic sleeve and the corresponding connecting block, and an abutting part is provided on the protrusion, and the abutting part extends into the first through hole and abuts against the next section of the telescopic sleeve. The abutting part has a certain elasticity and can produce a friction damping effect with the next section of the telescopic sleeve, thereby achieving a sliding damping effect between different sections of the telescopic sleeve.

5. The telescopic sleeve assembly with a thin inner diameter according to claim 3, characterized in that: When the telescopic sleeve adopts a pull rope structure or a bellows structure for limiting the position, a limit pull rope or a limit bellows is connected between the connecting parts of the two adjacent sections of the telescopic sleeve. As the two adjacent sections of the telescopic sleeve are gradually pulled apart, the limit pull rope is also gradually straightened, or the wrinkled part of the limit bellows is also gradually straightened. When the limit pull rope is completely straightened, or the wrinkled part of the limit bellows is completely straightened, the different sections in the telescopic sleeve can be prevented from completely separating.

6. The telescopic sleeve assembly with a thin inner diameter according to claim 3, characterized in that: When the telescopic sleeve is limited by a position-limiting telescopic sleeve, the connecting portion is a connecting block, and a section of the position-limiting telescopic sleeve is provided on the connecting block of each section of the telescopic sleeve parallel to the axis of the telescopic sleeve. When the telescopic sleeves are sleeved step by step, the position-limiting telescopic sleeves are also sleeved step by step, and the position-limiting telescopic sleeves are prevented from completely separating different sections of the position-limiting telescopic sleeves by a second position-limiting structure.

7. The telescopic sleeve assembly with a thin inner diameter according to claim 6, characterized in that: The diameters of the different sections of the position-limiting telescopic sleeve decrease or increase in sequence; a third through hole is provided on the connecting block, and each section of the position-limiting telescopic sleeve correspondingly passes through the third through hole, wherein a second position-limiting structure is provided between two adjacent sections of the position-limiting telescopic sleeve, and the second position-limiting structure includes a first position-limiting portion and a second position-limiting portion. The first position-limiting portion and the second position-limiting portion interfere with each other to prevent the position-limiting telescopic sleeves of different sections from completely separating, thereby preventing the telescopic sleeves of different sections from completely separating; When the front section of the limiting telescopic sleeve is inserted into the rear section, the first limiting portion is arranged on the front end of the inner wall of the rear section of the limiting telescopic sleeve, and the second limiting portion is arranged on the rear end of the outer wall of the front section of the limiting telescopic sleeve. The movement of different sections of the telescopic sleeve is limited by the front and rear limiting action of the first limiting portion and the second limiting portion.

8. The telescopic sleeve assembly with a thin inner diameter according to claim 3, characterized in that: When the telescopic sleeve is axially limited by the pull rod structure, the pull rod structure includes a guide rod, the connecting part is a connecting block, and a first guide hole is provided on the connecting block on each section of the telescopic sleeve. One end of the guide rod is connected to the connecting block on the previous section of the telescopic sleeve, and the other end of the guide rod passes through the first guide hole on the connecting block on this section of the telescopic sleeve, and adjacent guide rods are staggered and arranged at intervals in the circumferential direction of the telescopic sleeve, and all guide rods are arranged around the telescopic sleeve.

9. The telescopic sleeve assembly with a thin inner diameter according to claim 8, characterized in that: The end of the guide rod passing through the first guide hole is fixedly provided with a third limiting portion. The guide rod slides back and forth in the first guide hole of the connecting block to limit the movement of different sections of the telescopic sleeve. When two adjacent sections of the telescopic sleeve are gradually extended to a certain extent, the third limiting portion abuts against the connecting block on the upper section of the telescopic sleeve. The third limiting portion prevents the different sections of the telescopic sleeve from being completely separated. The connecting block of each section of the telescopic sleeve can prevent the different sections of the telescopic sleeve from being completely retracted.

10. The telescopic sleeve assembly with a thin inner diameter according to claim 3, characterized in that: When the telescopic sleeve adopts a connecting rod structure for limiting, the connecting part is a connecting block, and a limiting connecting rod assembly is connected between the connecting blocks on the two adjacent sections of the telescopic sleeve. The limiting connecting rod assembly is composed of multiple connecting rods hinged to each other. As the two adjacent sections of the telescopic sleeve are gradually stretched, the multiple connecting rods of the limiting connecting rod assembly that are hinged to each other are also gradually straightened from the bent state. When the limiting connecting rod assembly is completely straightened or pulled to the limiting angle, the different sections in the telescopic sleeve can be prevented from completely separating. The limiting connecting rod assembly includes two first connecting rods and a second connecting rod that are hinged to each other, and the front end of the first connecting rod and the rear end of the second connecting rod are respectively hinged to the connecting blocks on the two adjacent sections of the telescopic sleeve.

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