CN115068054A

CN115068054A - Expander subassembly suitable for from expansion device

Info

Publication number: CN115068054A
Application number: CN202210573655.2A
Authority: CN
Inventors: 朱国庆; 周而辰; 石松林; 李志刚; 王国辉
Original assignee: Shanghai Weilang Medical Technology Co ltd
Current assignee: Shanghai Weilang Medical Technology Co ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-09-20
Anticipated expiration: 2042-05-24
Also published as: CN115068054B

Abstract

The invention provides an expander component suitable for a self-expansion device, which comprises a push rod, a knob, a shell and an expander, wherein the knob is rotatably connected to the near end of the shell; the expander is correspondingly connected with the push rod and extends out of the far end of the shell; the push rod is externally provided with a limiting bulge, the knob is internally provided with a guide track corresponding to the push rod, and the knob is rotated to enable the guide track and the limiting bulge to be mutually blocked after being staggered; set up spacing arch, rotate through the knob and carry out the stop to spacing arch to the expander can lock leading-in sheath and expander each other before getting into the human body, prevents to get into human back expander and takes place uncontrollable slip, avoids damaging the vascular wall at the operation in-process.

Description

Expander subassembly suitable for from expansion device

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an expander assembly suitable for a self-expansion device.

Background

Deep Venous Thrombosis (DVT) is a blood reflux disorder disease caused by abnormal coagulation, is a very dangerous disease, can cause femoral bruise and pulmonary embolism, even has serious consequences such as shock, venous gangrene and death, and particularly is pulmonary embolism which can enter pulmonary artery along blood flow when the thrombus falls off to cause pulmonary embolism, acute pulmonary embolism is often easy to misdiagnose and miss-diagnose, and the death rate is 20 to 30 percent. According to a series of studies, the use of a venous thrombectomy device is a timely and effective treatment method. The vein thrombus taking device is mainly characterized in that a channel is established through a catheter sheath and an expander, a thrombus taking catheter system is sent into a blood vessel, the thrombus taking system is unfolded, the thrombus taking catheter is dragged, coagulated blood clots are pulled out of the body, and residual thrombus is removed through a suction device. The existing clinical data show that compared with other thrombus taking modes, the vein thrombus taking device is easier to operate, shortens the operation time, has high treatment effectiveness, reduces the bleeding rate and reduces the pain degree of patients.

The existing vein thrombectomy device in the market needs to be matched with the dilator for use when being used clinically, is used for fixing the sheath and hiding the self-expansion device at the tail end of the sheath, and when vein thrombectomy is carried out, the dilator is easy to slide and influence the release of the self-expansion device after entering the human body, so that injury to the vascular wall is extremely easy to occur, and certain risk is brought to the operation.

Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

It is an object of the present invention to overcome the above-mentioned deficiencies of the prior art and to provide a dilator assembly suitable for use in a self-expanding device.

In order to achieve the above purpose, the invention provides the following technical scheme:

an expander assembly suitable for a self-expanding device comprises a push rod, a knob, a shell and an expander, wherein the knob is rotatably connected to the proximal end of the shell, the push rod penetrates through the knob and then extends into the shell, and the push rod is assembled in a sliding mode along the length direction of the shell;

the dilator is correspondingly connected with the push rod and extends out of the far end of the shell; the push rod is externally provided with a limiting bulge, the knob is internally provided with a guide rail corresponding to the push rod, and the knob is rotated to enable the guide rail and the limiting bulge to be mutually blocked after being staggered.

Preferably, the number of the limiting bulges is three, and a first limiting bulge, a second limiting bulge and a third limiting bulge are sequentially arranged from the far end to the near end of the push rod;

rotating the knob to enable the first limiting bulge and the second limiting bulge to be respectively blocked at two ends of the knob;

or, the knob is rotated to stop the first limiting bulge and the third limiting bulge between the far end of the shell and the guide track.

Preferably, the first limiting bulge and the third limiting bulge are positioned on the same generatrix of the cylinder corresponding to the pushing rod;

the first limiting protrusion and the second limiting protrusion are symmetrically distributed relative to the pushing rod.

Preferably, the two symmetrical sides of the guide rail are respectively provided with a sliding groove corresponding to the limiting protrusion.

Preferably, a limit baffle corresponding to the limit protrusion is arranged in the inner cavity of the housing, so that a stop station corresponding to the first limit protrusion and the third limit protrusion is formed with the guide rail.

Preferably, the middle part of the shell is provided with a sliding rail corresponding to the push rod.

Preferably, the outer wall of the guide track extends radially with positioning columns, the near end of the housing is provided with two clamping grooves corresponding to the positioning columns, and the two clamping grooves are distributed at intervals at a certain angle in the circumferential direction of the housing; after the positioning column is clamped in one of the clamping grooves, the pushing rod is opposite to the guide rail.

Preferably, two first bosses corresponding to the two clamping grooves are further arranged inside the shell, and second bosses corresponding to the first bosses are arranged outside the guide rail.

Preferably, the guide track is arranged in a guide pipe extending along the axial direction of the knob, and an arc-shaped surface corresponding to the outer wall of the guide pipe is arranged on the first boss.

Preferably, the proximal end of the housing is provided with a first interface, the knob is correspondingly sleeved outside the first interface, the outer wall of the first interface is provided with an annular bulge, and the inner wall of the knob is correspondingly provided with an annular bulge.

Preferably, the distal end of the shell is detachably connected with a sheath, and the sheath is correspondingly sleeved outside the dilator;

the distal end of the dilator is provided with a self-expansion device which moves with the dilator and is retracted into the sheath;

or the self-expansion device is separated from the sheath and expanded with the movement of the dilator.

Preferably, the distal end of shell is equipped with corresponding second interface, the sheath pipe passes through the corresponding cup joint of sheath pipe interface and is in the outside of second interface, the outer wall of second interface is equipped with annular protrusion, the correspondence of sheath pipe interface inner wall is equipped with annular protrusion.

Preferably, the main body of the housing comprises two halves, wherein one of the halves is provided with a plurality of positioning holes, and the other half is correspondingly provided with a plurality of positioning pins.

Preferably, the proximal end of the push rod is provided with a luer connector, and the outer wall of the push rod is provided with a handle close to the luer connector.

Has the advantages that: set up spacing arch, rotate through the knob and carry out the stop to spacing arch to the expander can lock leading-in sheath and expander each other before getting into the human body, prevents to get into human back expander and takes place uncontrollable slip, avoids damaging the vascular wall at the operation in-process.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:

FIG. 1 is a schematic structural view of a dilator assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of a push rod according to one embodiment of the present invention;

FIG. 3 is a simplified structural diagram of a knob according to one embodiment of the present invention;

FIG. 4 is a simplified structural diagram of a first stop protrusion and a third stop protrusion according to one embodiment of the present invention for locking a push rod;

FIG. 5 is a simplified structural diagram of a push rod locked by a first stop protrusion and a second stop protrusion according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of the distribution of card slots according to one embodiment of the present invention;

FIG. 7 is a schematic view of the construction of the lower case of one embodiment of the present invention;

FIG. 8 is a schematic structural view of an upper shell of one embodiment of the present invention;

FIG. 9 is an assembled schematic view of a dilator assembly according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of an enclosure according to an embodiment of the present invention.

In the figure: 1. a push rod; 2. a knob; 3. a housing; 4. a sheath tube interface; 5. a sheath tube; 6. a self-expanding device; 7. a dilator;

101. a first limit protrusion; 102. a second limit bulge; 103. a third limiting bulge; 104. a handle; 105. a luer fitting;

201. a conduit; 202. a second boss; 203. positioning columns, 204 and guide rails;

301. an upper shell; 302. a lower case; 303. a guide plate; 304. a first boss; 305. a card slot; 306. an annular projection; 307. a limit baffle; 308. positioning the pin column; 309. a second interface; 310. a first interface; 311. and (7) positioning the holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" as used herein are intended to be broadly construed, and may include, for example, fixed connections and removable connections; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1-10, a dilator assembly suitable for a self-expanding device, in this embodiment, the dilator assembly uses one end of a dilator 7 extending into a blood vessel as a distal end and the other end as a proximal end, the dilator assembly includes a push rod 1, a knob 2, a housing 3 and a dilator 7, the knob 2 is rotatably connected to the proximal end of the housing 3, in one embodiment, the knob 2 is a cap-shaped body, and the knob 2 is correspondingly buckled on the proximal end of the housing 3, so as to realize the rotary connection; in one embodiment, the inner side of the cavity at the far end of the knob 2 is provided with an annular bulge, correspondingly, the outer wall at the near end of the shell 3 is also provided with an annular bulge, and the knob 2 is pressed towards the shell 3 by force, so that the bulge on the knob 2 slides over the bulge on the outer wall of the shell to form a rotary connection; in one embodiment, the inner side of the cavity at the far end of the knob 2 is provided with an annular bulge, correspondingly, the outer wall at the near end of the shell 3 is provided with an annular sliding groove, and the bulge on the knob can be pressed into the sliding groove to form a rotary connection; in one embodiment, the knob 2 is sleeved on the proximal end of the shell 3 in a damping rotating shaft manner to form a rotating connection; in one embodiment, the knob 2 is connected with the housing 3 through the internal and external thread matching with a small pitch, the small pitch is defined as that when the knob 2 is rotated by 90 degrees in the circumferential direction, the axial displacement is within an error allowable range, namely, the locking of the push rod 1 is not interfered; the rotary connection can also be other connection modes which can realize the same function. The push rod 1 penetrates through the knob 2 and then extends into the housing 3, and is slidably assembled along the length direction of the housing 3 so as to be displaced along the length direction of the housing 3, so as to drive the dilator 7 at the distal end to move, in one embodiment, the dilator 7 extends into the housing 3 from the distal end and is correspondingly connected with the push rod 1, in one embodiment, the dilator 7 is firstly connected with the push rod 1, and extends into the housing 3 from the proximal end; the far end of the push rod is provided with a mounting hole, the diameter of the mounting hole is larger than the outer diameter of the dilator 7, the near end of the dilator 7 is inserted into the mounting hole and is bonded or thermally fused by glue or adhesive tape or fixedly connected in other modes. The external portion of the push rod 1 is provided with a limiting protrusion, the interior of the knob 2 is provided with a guide rail 204 corresponding to the push rod 1, the guide rail 204 is matched with the push rod 1 and is provided with a sliding groove corresponding to the limiting protrusion, the knob 2 is rotated to enable the guide rail 204 and the limiting protrusion to generate a certain angle of deviation, the specific angle of deviation is not limited too much, and specifically, the guide rail 204 and the limiting protrusion are staggered or overlapped on the axial projection of the push rod 1 and then are blocked. Rotate through knob 2 and carry out the stop to spacing arch to expander 7 can lock leading-in sheath and expander 7 each other before getting into the human body, and expander 7 takes place uncontrollable slip after preventing to get into the human body, avoids damaging the vascular wall in the operation process.

In another optional embodiment, there are three limiting protrusions, and a first limiting protrusion 101, a second limiting protrusion 102 and a third limiting protrusion 103 are sequentially arranged along the distal end to the proximal end of the push rod 1;

in the process of inserting the dilator 7 into the blood vessel of the human body, the pushing rod 1 does not completely extend into the shell 3, and at the moment, the knob 2 is rotated, so that the first limiting bulge 101 and the second limiting bulge 102 are respectively blocked at two ends of the knob 2; or after the dilator 7 is inserted into the blood vessel of the human body, the push rod 1 is completely inserted into the shell 3, and at this time, the knob 2 is rotated, so that the first limiting bulge 101 and the third limiting bulge 103 are stopped between the distal end of the shell 3 and the guide track 204; the push rod 1 is thus locked during the operation, so that it is ensured that the dilator 7 cannot slide in the blood vessel.

In another optional embodiment, the first limiting protrusion 101 and the third limiting protrusion 103 are located on the same generatrix of the corresponding cylinder of the pushing rod 1, that is, the central axes of the first limiting protrusion 101 and the third limiting protrusion 103 intersect with and are perpendicular to the same generatrix. Therefore, in the axial projection of the push rod 1, the first limiting bulge 101 and the third limiting bulge 103 are mutually overlapped; first spacing arch 101 and second spacing arch 102 are about push rod 1 symmetric distribution, and the symmetric distribution means, second spacing arch 102 is located push rod 1 and is relative one side with first spacing arch 101, and mirror symmetry in the traditional sense is not, in other words, second spacing arch 102 is not on the same horizontal plane with the axis of first spacing arch 101. The two symmetrical sides of the guide rail 204 are respectively provided with a sliding groove corresponding to the limiting protrusion, so that the limiting protrusion is matched with the axial projection profile of the push rod 1, and after the knob 2 rotates, the limiting protrusion is staggered with the sliding groove, so that the push rod 1 is limited.

In another optional embodiment, a limiting baffle 307 corresponding to the limiting protrusion is disposed in the inner cavity of the housing 3, the limiting baffle 307 is a distal end of the inner cavity of the housing 3, a through hole corresponding to the pushing rod 1 is disposed in the middle of the limiting baffle 307, and the limiting protrusion is blocked at the limiting baffle 307 to form a blocking station corresponding to the first limiting protrusion 101 and the third limiting protrusion 103 with the guide rail 204, and the length of the blocking station is adapted to the distance between the first limiting protrusion 101 and the third limiting protrusion 103 away from each other, so as to limit the pushing rod 1.

In another optional embodiment, the limiting protrusion is a boss arranged on the outer wall of the pushing rod 1, the boss extends out along the radial direction of the pushing rod 1, two surfaces corresponding to the far end and the near end are flat surfaces perpendicular to the axial direction of the pushing rod 1, and the middle part of the shell 3 is provided with a sliding rail corresponding to the pushing rod 1. The track is connected with the guide track 204 of the pusher knob 2 to ensure that the pushing rod 1 passes through smoothly, and the first limiting bulge 101 at the far end of the pushing rod 1 is blocked by the limiting baffle 307 when reaching the end point of the sliding rail. The slide rail and the adaptation of push rod 1, have and correspond spacing bellied spout to this after push rod 1 inserts shell 3, inject push rod 1's angle, avoid operation in-process push rod 1 to take place relative rotation.

In this embodiment, two guide parts are respectively located the opposite both sides in shell 3 inner chamber to form the slide rail, and every guide part includes two parallel distribution's deflector 303, and the clearance between two deflectors 303 and spacing protruding looks adaptation. The surface of the guide plate 303 corresponding to the outer wall of the push rod 1 is an arc-shaped surface, so that the push rod 1 is limited to shake in the using process.

In another optional embodiment, the positioning posts 203 extend out of the outer wall of the guide rail 204 along the radial direction thereof, the proximal end of the housing 3 is provided with two slots 305 corresponding to the positioning posts 203, the two slots 305 are distributed at certain angular intervals in the circumferential direction of the housing 3, that is, the two slots 305 are distributed on the same cross section of the housing 3, the positions of the two slots 305 on the cross section form a certain included angle with a connecting line of the axis, the specific included angle is not limited, after the positioning posts 203 are clamped in one of the slots 305, the push rod 1 faces the guide rail 204, at this time, the limit protrusions are opposite to the sliding grooves on both sides of the guide rail 204 to release the blocking, so that the push rod 1 can be pushed along the guide rail 204, and after the positioning posts 203 are switched and clamped in the other slot 305, the limit protrusions are staggered with the sliding grooves on both sides of the guide rail 204 to generate the blocking. Preferably, the angle of the two slots 305 in the circumferential direction of the housing 3 is 90 degrees, and the opening directions of the two slots 305 are opposite, so that the positioning column 203 is switched in the two slots 305 along with the rotation of the knob.

In this embodiment, the slot 305 is an elastic member, a positioning station corresponding to the positioning column 203 is disposed on the slot 305, the opening side of the slot 305 is a horn-shaped opening corresponding to the positioning station, and the minimum opening of the horn-shaped opening is slightly smaller than the outer diameter of the positioning column 203.

In this embodiment, the latching groove 305 extends parallel to a tangent of the inner cavity of the housing 3, so that the latching pin can be smoothly latched during rotation of the knob 2.

In another optional embodiment, two first bosses 304 corresponding to the two slots 305 are further disposed inside the housing 3, the two first bosses 304 are respectively close to the two slots 305 and are consistent with the two slots 305 in terms of the interval angle, a second boss 202 corresponding to the first boss 304 is disposed on the outer wall of the guide rail 204, the first boss 304 stops the second boss 202 during the rotation of the knob 2, and when the positioning column 203 is switched between the two slots 305, the second boss 202 is switched between the two first bosses 304, so as to limit the rotation angle of the knob 2.

In the embodiment, the outer wall of the knob 2 is provided with anti-skid projections.

In another optional embodiment, the guide track 204 is disposed in the guide tube 201 extending axially along the knob 2, the guide tube 201 and the knob 2 are integrally formed, the guide track 204 is disposed inside the guide tube 201, and the first boss 304 is provided with an arc-shaped surface corresponding to an outer wall of the guide tube 201, so that the guide tube 201 is limited by the first boss 304, and the guide tube 201 is prevented from shifting during rotation.

In another optional embodiment, the proximal end of the housing 3 is provided with a first interface 310, the knob 2 is correspondingly sleeved outside the first interface 310, the outer wall of the first interface 310 is provided with an annular protrusion 306, and the inner wall of the knob 2 is correspondingly provided with an annular protrusion 306. The knob 2 is buckled with the first interface 310 along the length direction of the shell 3, and after the annular bulge 306 of the knob 2 passes through, the annular bulge 306 on the first interface 310 is limited, so that the knob 2 is prevented from easily falling off when rotating.

In this embodiment, an annular groove corresponding to the annular protrusion 306 on the outer wall of the first connector 310 may also be provided on the inner wall of the knob 2, so as to achieve the limit.

In another alternative embodiment, the distal end of the housing 3 is detachably connected with a sheath tube 5, the sheath tube 5 is correspondingly sleeved outside the dilator 7, a certain gap is formed between the inner wall of the sheath tube 5 and the dilator 7, the distal end of the dilator 7 is provided with a self-expanding device 6, the self-expanding device 6 is moved along with the dilator 7 and is received in the sheath tube 5, specifically, when the dilator 7 is inserted into a blood vessel of a human body, the knob 2 is rotated to stop the first limiting protrusion 101 and the second limiting protrusion 102 at two ends of the knob 2, the self-expanding device 6 is located inside the sheath tube 5, so as to receive the self-expanding device 6.

Or the self-expanding device 6 is separated from the sheath 5 and expanded with the movement of the dilator 7, specifically, after the dilator 7 is inserted into the human blood vessel, when the knob 2 is rotated to stop the first limit bulge 101 and the third limit bulge 103 between the distal end of the housing 3 and the guide track 204, the self-expanding device 6 is positioned outside the sheath 5 and automatically expands, the self-expanding device 6 hidden in the sheath 5 is released from the dilator 7, and the self-expanding device 6 can prevent the distal embolism caused by thrombus fragments generated in the operation process.

Although the self-expanding device 6 is shown as a tapered catheter, this shape is not a limitation of the present invention, and the self-expanding device 6 may be a reducer catheter having a non-uniform diameter after delivery, particularly a catheter having a maximum diameter at the distal end, such as a tapered catheter, a flared catheter, etc., without limitation to the shape of the self-expanding device 6.

In another optional embodiment, the distal end of the housing 3 is provided with a corresponding second interface 309, the sheath 5 is correspondingly sleeved outside the second interface 309 through the sheath interface 4, the outer wall of the second interface 309 is provided with an annular protrusion 306, the inner wall of the second interface 309 is correspondingly provided with an annular protrusion 306, the sheath interface 4 is fastened to the first interface 310 along the length direction of the housing 3, after the annular protrusion 306 of the sheath interface 4 passes through, the annular protrusion 306 on the second interface 309 is limited, and it is ensured that the knob 2 cannot easily fall off when rotating.

In this embodiment, the inner wall of the sheath interface 4 may also be an annular groove corresponding to the annular protrusion 306 on the outer wall of the second interface 309, so as to achieve the limiting.

In another alternative embodiment, the main body of the housing 3 comprises two halves, specifically an upper shell 301 and a lower shell 302, wherein the upper shell 301 is provided with a plurality of positioning holes 311, and the lower shell 302 is provided with a plurality of positioning pins 308. When epitheca 301 and inferior valve 302 lock, carry on spacingly through locating hole 311 and locating pin post 308, in addition, sheath pipe interface 4 and knob 2 can also be banded to the both ends of shell 3, further guarantee shell 3's structural stability. In one embodiment, the positioning holes are symmetrically distributed on two sides of the upper shell 301 that are symmetrical with respect to the slide rail, so as to connect the upper shell 301 and the lower shell 302 after being matched with the corresponding positioning pins 308, and the number of the positioning holes 311 or the positioning pins 308 may be 4, 6, or 8.

In the present embodiment, two card slots 305 are respectively located on the upper case 301 and the lower case 302, and two first bosses 304 are respectively located on the upper case 301 and the lower case 302.

In another alternative embodiment, the proximal end of the push rod 1 is provided with a luer 105, the outer wall of the push rod 1 is provided with a handle 104 near the luer 105, wherein the luer 105 is used for injecting medicine liquid or preventing blood leakage during operation, and the handle 104 facilitates the operation of the push rod 1 to move back and forth integrally.

In another alternative embodiment, the dilator 7 is inserted into the distal end of the push rod 1, and the dilator 7 and the push rod 1 are connected by glue.

During assembly, glue is uniformly coated on the near end of the dilator 7 and is inserted into an inner hole of about 3-5cm at the far end of the push rod 1, after fixation, the push rod 1 and the dilator 7 are inserted into the guide track 204 in the middle of the knob 2 until the handle 104 at the near end of the push rod 1 is close to the pusher knob 2; inserting the 6 positioning holes 311 of the upper shell 301 tightly corresponding to the 6 positioning posts 203 of the lower shell 302, inserting the distal end of the dilator 7 into the slide rail in the middle of the assembled shell 3 until the first interface 310 at the proximal end of the shell 3 enters the inside of the knob 2, the annular protrusion 306 of the knob 2 contacts with the annular protrusion 306 at the first interface 310, pressing the knob 2 with 10-15N of force to make the annular protrusion 306 of the knob 2 slide over the annular protrusion 306 at the first interface 310, connecting the self-expanding device 6 to the distal end of the sheath 5 corresponding to the dilator 7, firmly connecting the proximal end of the sheath 5 and the sheath joint, inserting the distal end of the dilator 7 from the sheath interface 4 until the sheath 5 extends out, inserting the second interface 309 at the distal end of the shell 3 into the inner hole of the sheath interface 4, because the inner hole size is slightly smaller than the outer diameter of the second interface 309, pressing the inner hole of the second interface 309 into the inner hole of the sheath interface 4 with 10-15N of force, the shell 3 and the sheath tube interface 4 are locked with each other, the pushing rod 1 is moved backwards to enable the self-expansion device 6 to be hidden in a gap between the sheath tube 5 and the dilator 7, the knob is rotated by 90 degrees by 10-15N force, the positioning column 203 enters the clamping groove 305 in the lower shell 302, the first limiting protrusion 101 and the second limiting protrusion 102 are respectively blocked at two ends of the knob 2 and cannot move forwards and backwards, the sliding rail limits the first limiting protrusion 101 arranged in the sliding rail at the moment, the pushing rod 1 is guaranteed not to shake left and right, and the dilator 7 is prevented from damaging a blood vessel wall or mucosa due to the fact that the pushing rod 1 shakes left and right in the operation process.

During operation, when the dilator 7 assembly is inserted into a blood vessel of a human body, the first limiting protrusion 101 and the second limiting protrusion 102 of the dilator 7 are always kept in a locked state, so that the situation that the dilator 7 damages the blood vessel wall and causes an obstacle to the operation in the process of entering the human body is avoided, after the distal end of the dilator 7 reaches a designated position, the knob 2 is reversely rotated by 10-15N force, so that the positioning column 203 is unlocked from the clamping groove 305 of the lower shell 302 and enters the clamping groove 305 of the upper shell 301, the stop of the push rod 1 is released, the first boss 304 and the second boss 202 can avoid the excessive rotation of the knob 2, the push rod 1 is limited by the slide rail and cannot shake left and right when the knob 2 rotates and advances, the push rod 1 moves forwards to the farthest end of the slide rail and is stopped by the limiting baffle 307, at the moment, the hidden self-expansion device 6 is released from the dilator 7, and after the self-expansion device 6 is completely released, and rotating the pusher knob by 10-15N for 90 degrees again to unlock the positioning column 203 from the clamping groove 305 of the upper shell 301, so as to enter the clamping groove 305 of the lower shell 302, wherein the first limit bulge 101 is stopped at the limit baffle 307, the third limit bulge 103 is stopped at the end part of the guide tube 201, the limit baffle 307 prevents the push rod 1 from moving forwards, the guide tube 201 prevents the push rod 1 from moving backwards, the push rod 1 and the dilator 7 are locked, then holding the pusher shell 3, pulling out the shell 3 from the sheath tube interface 4 by 10-15N, and thus taking out the dilator 7 to continue the next operation. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.

The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.

Claims

1. An expander component suitable for a self-expansion device, which comprises a push rod, a knob, a shell and an expander and is characterized in that,

the knob is rotatably connected to the near end of the shell, and the push rod penetrates through the knob and then extends into the shell and is assembled in a sliding mode along the length direction of the shell;

2. The dilator assembly suitable for a self-expanding device according to claim 1, wherein there are three limiting protrusions, a first limiting protrusion, a second limiting protrusion and a third limiting protrusion in sequence from the distal end to the proximal end of the push rod;

3. The dilator assembly adapted for use with a self-expanding device according to claim 2, wherein the first and third limiting protrusions are located on the same generatrix of the corresponding cylinders of the push rod;

4. An expander assembly suitable for use in a self-expanding device as claimed in claim 3, in which the mutually symmetrical sides of the guide track are provided with respective runners corresponding to the stop lugs.

5. An expander assembly suitable for use in a self-expanding device according to claim 2, wherein the inner cavity of the housing is provided with a stop corresponding to the stop protrusion to form a stop station with the guide track corresponding to the first stop protrusion and the third stop protrusion.

6. An expander assembly suitable for use in a self-expanding device according to claim 2, in which the housing is provided with a slide track in the middle thereof corresponding to the push rod.

7. The expander assembly suitable for a self-expanding device as claimed in claim 1, wherein the outer wall of the guide track has positioning posts extending radially therefrom, and the proximal end of the housing has two slots corresponding to the positioning posts, the two slots being angularly spaced around the circumference of the housing; after the positioning column is clamped in one of the clamping grooves, the pushing rod is opposite to the guide rail.

8. An expander assembly suitable for use in a self-expanding device according to claim 7, in which the housing further comprises two first projections corresponding to the two slots, respectively, and the guide track further comprises second projections corresponding to the first projections on the exterior thereof.

9. A dilator assembly according to claim 8, wherein said guide track is arranged in a conduit extending axially along said knob, said first boss being provided with an arcuate surface corresponding to an outer wall of said conduit.

10. The dilator assembly suitable for a self-expanding device according to claim 1, wherein the proximal end of the housing is provided with a first port, the knob is sleeved on the outside of the first port, the outer wall of the first port is provided with an annular protrusion, and the inner wall of the knob is provided with an annular protrusion.

11. The dilator assembly adapted for use with a self-expanding device according to claim 1, wherein a sheath is removably attached to a distal end of said sheath, said sheath being correspondingly sleeved over an exterior of said dilator;

12. The dilator assembly suitable for a self-expanding device according to claim 11, wherein the distal end of the housing is provided with a corresponding second port, the sheath is sleeved outside the second port through the sheath port, an outer wall of the second port is provided with an annular protrusion, and an inner wall of the sheath port is provided with the annular protrusion.

13. A dilator assembly according to claim 1 wherein the body of the housing comprises two halves, one of the halves having a plurality of locating holes and the other of the halves having a corresponding plurality of locating pins.

14. A dilator assembly adapted for use in a self-expanding device according to claim 1, wherein the proximal end of the push rod is provided with a luer fitting and the outer wall of the push rod is provided with a handle adjacent the luer fitting.