CN115414087A

CN115414087A - Dilator assembly

Info

Publication number: CN115414087A
Application number: CN202210573654.8A
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: 2022-12-02
Anticipated expiration: 2042-05-24
Also published as: CN115414087B

Abstract

The invention provides an expander assembly which comprises an expander, an introducing sheath tube and a self-expansion device, wherein the expander comprises an expander rod and an expander shell which are matched with each other, a track for the movement of the expander rod is arranged in the expander shell, the track extends along the length direction of the expander shell and is provided with a far end and a near end, the expander rod can be locked with the expander shell at the near end and the far end of the track, and the expander rod can move along the track after the locking is released; the proximal end of the dilator extends into the pusher shell and is fixedly connected with the pushing rod; the leading-in sheath tube is connected to the far end of the pusher shell through a sheath tube joint; the self-expansion device is fixed at the distal end of the guiding sheath and is hidden in the gap between the guiding sheath and the dilator. According to the dilator assembly, the dilator and the guiding sheath tube are mutually locked in the process of entering and exiting a human body, so that the dilator can be effectively prevented from uncontrollably sliding in the human body, and the risk of injury to the vascular wall is reduced.

Description

Dilator assembly

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an expander assembly.

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 thrombus removal catheter system is mainly used for establishing a passage through a catheter sheath and an expander, sending the thrombus removal catheter system into a blood vessel, unfolding the thrombus removal system, dragging the thrombus removal catheter, pulling out condensed blood clots out of the body, and removing residual thrombus 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 thrombus taking device on the market needs to be matched with a dilator for use in clinical use, and is used for fixing a sheath and hiding a self-expansion device at the tail end of the sheath. However, when vein thrombosis is performed (or other blockages are taken out from the body cavity of a patient), after the dilator enters the human body, the dilator is smaller than the guiding sheath, so that the dilator is easy to slide, the release of the self-expanding device is influenced, the vascular wall is easy to be injured, and certain risks are 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

The invention aims to provide a dilator assembly to solve the problem that the existing dilator is easy to slide in a human body because the outer diameter of the dilator is smaller than that of an introducing sheath.

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

a dilator assembly, the dilator assembly comprising:

the pushing device comprises a pushing rod and a pushing device shell which are matched, a track for the pushing rod to move is arranged in the pushing device shell, the track extends along the length direction of the pushing device shell and is provided with a far end and a near end, the pushing rod can be locked with the pushing device shell at the near end and the far end of the track, and the pushing rod can move along the track after being unlocked;

the proximal end of the dilator extends into the pusher shell and is fixedly connected to the pushing rod;

an introducer sheath connected to the distal end of the pusher housing by a sheath connector;

a self-expanding device secured to a distal end of the introducer sheath and concealed within a gap between the introducer sheath and the dilator.

Optionally, the push rod is locked with the pusher housing at both the proximal end and the distal end of the track by the mating of a boss and a catch.

Optionally, a locking boss is arranged at the distal end of the pushing rod, a locking clamping groove and an elastic shifting piece are arranged at the proximal end and the distal end of the rail, the locking clamping groove and the elastic shifting piece are respectively located at two sides of the rail, one side of the locking boss is in interference fit with the elastic shifting piece, and the other side of the locking boss is clamped in the locking clamping groove, so that the pushing rod is locked with the pusher shell;

and rotating the push rod to enable the locking boss to slide through the elastic shifting piece, unlocking the push rod and the pusher shell, and enabling the push rod to move along the track after unlocking.

Optionally, the locking boss sets up to two relatively, orbital near-end and distal end all are provided with two locking draw-in groove and two the elasticity plectrum, each one side of locking boss all with elasticity plectrum interference fit, the equal joint of opposite side in the locking draw-in groove, and two the locking draw-in groove is located the both sides of locking boss, two the elasticity plectrum is located the both sides of locking boss.

Optionally, an annular boss is arranged at the far end of the pushing rod, annular clamping grooves are arranged at the near end and the far end of the track, and the annular clamping grooves are coaxially arranged with the track and communicated with the track;

the annular boss is clamped and locked with the annular clamping groove, so that the pushing rod is locked with the pusher shell;

the pushing rod is pushed, so that the annular boss is separated from the annular clamping groove, the locking between the pushing rod and the pusher shell is released, and the pushing rod can move along the track after the locking is released.

Optionally, the annular boss is an elastic boss, the inner diameter of the annular clamping groove is matched with the outer diameter of the annular protrusion, an annular protrusion structure is arranged on the inner wall of the annular clamping groove, the inner diameter of the annular protrusion structure is smaller than the outer diameter of the annular boss, and the annular boss is clamped and locked in the annular clamping groove on one side of the annular protrusion structure, which faces away from the track, so that the push rod is locked with the pusher shell;

or, the ring-shaped clamping groove is a tapered groove, the inner diameter of the ring-shaped clamping groove at the near end of the track is gradually reduced from the far end to the near end, the inner diameter of the ring-shaped clamping groove at the far end of the track is gradually reduced from the near end to the far end, and the ring-shaped boss is clamped and locked at the small inner diameter of the ring-shaped clamping groove, so that the push rod is locked with the pusher shell.

Optionally, the pusher housing comprises a first housing and a second housing detachably connected, the first housing is provided with a first track inside, and a second track is arranged in the second shell, and the first track and the second track are enclosed to form a track.

Optionally, a positioning column is arranged in the first housing, a positioning hole is correspondingly arranged in the second housing, and the positioning column is inserted into the positioning hole.

Optionally, the proximal end of the introducing sheath is bonded and fixed to the inner wall of the sheath joint; and/or a connecting hole is formed in a knob of the sheath pipe joint, a connecting cylinder is arranged at the far end of the pusher shell, and the connecting cylinder is clamped and fixed in the connecting hole, so that the sheath pipe joint is connected with the pusher shell in a locking mode.

Optionally, the pushing rod is tubular, and the extending end of the expander is fixedly bonded to the inner wall of the pushing rod; and/or a luer connector is arranged at the proximal end of the push rod; the push rod is also provided with a handle.

Has the advantages that:

the dilator assembly comprises a pusher, a dilator, an introduction sheath and a self-expansion device, wherein the pusher comprises a pushing rod and a pusher shell, a track for the pushing rod to move is arranged in the pusher shell, the pushing rod can be locked with the pusher shell at the near end and the far end of the track, the pushing rod can move along the track after the locking is released, the near end of the dilator stretches into the pusher shell and is fixedly connected to the pushing rod, the introduction sheath is sleeved outside the dilator and is locked and connected to the far end of the pusher shell through a sheath joint, and the self-expansion device is fixed at the far end of the introduction sheath and is hidden in a gap between the introduction sheath and the dilator. Structural design like this, before the expander relied on the pusher to get into the human body, rely on push rod, pusher shell and sheath pipe to connect mutual locking at orbital near-end expander and leading-in sheath pipe, treat that the expander gets into human arrival assigned position after, the push rod is relieved and is locked to move along the track, when moving to orbital distal end, release from expanding unit, expander and leading-in sheath pipe are mutual locking once more this moment, adopt the pusher to extract it can outside the human body. Because the expander and leading-in sheath pipe all lock each other at the in-process of business turn over human, then can guarantee effectively that the expander can not take place uncontrollable slip in human to reduce the risk that the vascular wall received the injury.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary 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 view of a dilator assembly according to an embodiment of the present invention, shown released from an expansion device;

FIG. 2 is a schematic view of the push rod of FIG. 1;

FIG. 3 is a schematic view of the internal structure of a first housing of the presenter housing of FIG. 1;

FIG. 4 is a schematic view of the internal structure of a second housing of the presenter housing of FIG. 1;

FIG. 5 is a partial schematic structural view of the first housing of FIG. 3;

FIG. 6 is a partial structural view of the second housing of FIG. 3;

FIG. 7 is a schematic view of a locking connection between the sheath connector and the distal end of the pusher housing;

FIG. 8 is a schematic view of the dilator after insertion into the second housing of the pusher housing;

FIG. 9 is a schematic view of the pusher arm assembled with the proximal end of the pusher housing;

FIG. 10 is a schematic cross-sectional view of the pusher rod locked to the pusher housing;

FIG. 11 is a schematic view of the dilator assembly as it enters the body;

FIG. 12 is a schematic cross-sectional view of the pusher rod rotated 90 degrees and the pusher housing unlocked;

FIG. 13 is a schematic view of a pusher according to another embodiment of the present invention;

FIG. 14 is a schematic cross-sectional view of the pusher of FIG. 13;

FIG. 15 is a schematic view of the locking arrangement of the push rod to the proximal end of the pusher housing of FIG. 13;

FIG. 16 is an enlarged view of a portion of the structure of FIG. 15;

FIG. 17 is a schematic view of the locking arrangement of the pusher bar to the distal end of the pusher housing of FIG. 13;

FIG. 18 is an enlarged view of a portion of the structure of FIG. 17;

FIG. 19 is a cross-sectional view of the pusher rod of FIG. 13 locked to the distal end of the pusher housing.

Reference numbers in the figures: 1-a push rod; 11 a-locking boss; 11 b-an annular boss; 12-luer fitting; 13-a handle; 2-pusher housing; 21-a first housing; 211-positioning holes; 212-a first track; 22-a second housing; 221-positioning columns; 222-a second track; 23 a-locking card slot; 23 b-a ring slot; 231-annular raised structures; 24-an elastic pick; 25-a connecting cylinder; 3-a dilator; 4-introducing a sheath; 5-sheath joint; 51-a knob; 511-connecting hole; 6-self-expanding device.

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.

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

The invention provides a dilator assembly, aiming at the problem that a dilator is easy to slide in a human body due to the fact that the outer diameter of the dilator is smaller than that of an introducing sheath in the prior art.

As shown in fig. 1, in an embodiment of the present invention, the dilator assembly includes a pusher, a dilator 3, an introducing sheath 4, and a self-expanding device 6, the pusher includes a pushing rod 1 and a pusher housing 2, a track for the pushing rod 1 to move is provided in the pusher housing 2, the track extends along a length direction of the pusher housing 2, the pushing rod 1 is lockable with the pusher housing 2 at a proximal end and a distal end of the track, and the pushing rod 1 is movable along the track after unlocking, the proximal end of the dilator 3 extends into the pusher housing 2 and is fixedly connected to the pushing rod 1, the introducing sheath 4 is sleeved outside the dilator 3 and is locked and connected to the distal end of the pusher housing 2 by a sheath joint 5, and the self-expanding device 6 is fixed at the distal end of the introducing sheath 4 and is hidden in a gap between the introducing sheath 4 and the dilator 3. Structural design like this, before expander 3 relied on the pusher to get into the human body, expander 3 relied on push rod 1, pusher shell 2 and sheath coupling 5 and the mutual locking of sheath pipe at orbital near-end, can prevent effectively like this to get into the human back expander 3 and take place uncontrollable slip to reduce the risk that the vascular wall received the injury. Treat that expander 3 gets into human arrival assigned position after, the locking is removed to push rod 1 to along the track removal, when removing orbital distal end, release from expansion device 6, expander 3 and sheath pipe are locked each other this moment, and the in-process that extracts the human body at the expander like this can prevent that expander 3 from taking place uncontrollable slip, thereby reduces the risk that the vascular wall received the injury. And then, the human body is pulled out by adopting a pusher.

It should be noted that, in the present invention, the proximal end is the end close to the operator, and the distal end is the end far from the operator. The push rod 1 can be locked with the pusher housing 2 at both the proximal end and the distal end of the track, and its locking position can be at the proximal end of the track, the distal end, the side of the track near the proximal end face, the side of the track near the distal end face, or other reasonable and effective positions, which are not limited herein, and are within the scope of the present invention.

The locking mode of the pushing rod 1 and the pusher housing 2 of the invention can be a snap locking mode, a locking mode by adopting a fastener or other reasonable and effective modes, and is not limited herein and is within the protection scope of the invention.

In the optional embodiment of the invention, the pushing rod 1 is locked with the pusher housing 2 at the near end and the far end of the track through the matching of the boss and the clamping groove, the mode is simple to operate, and effective locking can be realized.

As shown in fig. 2 to 12, in an embodiment of the present invention, a distal end of the push rod 1 is provided with a locking boss 11a, a proximal end and a distal end of the rail are both provided with a locking slot 23a and an elastic pick 24, the locking slot 23a and the elastic pick 24 are respectively located at two sides of the rail, one side of the locking boss 11a is in interference fit with the elastic pick 24, and the other side is clamped in the locking slot 23a, so that the push rod 1 is locked with the pusher housing 2; the pushing rod 1 is rotated to enable the locking boss 11a to slide through the elastic shifting piece 24, the locking between the pushing rod 1 and the pusher shell 2 is released, and the pushing rod 1 can move along the track after the locking is released.

In this embodiment, push rod 1 is the pipe form, and its distal end outer wall is provided with locking boss 11a, and locking boss 11 a's surface is the arcwall face, and the track is circular track, and its internal diameter slightly is greater than push rod 1's external diameter to in the steady removal of push rod 1 in the track, can not take place when guaranteeing effectively that push rod 1 and expander 3 back-and-forth movement rock about, in order to avoid damaging the vascular wall. The size of locking draw-in groove 23a is slightly greater than the size of locking boss 11a to carry out effectual locking to locking boss 11a, when push rod 1 and pusher shell 2 lock, one side and the elasticity plectrum 24 interference fit of locking boss 11a, the opposite side joint is in locking draw-in groove 23a, can guarantee effectively like this and lock the steadiness. Further, by rotating the push lever 1 toward one side of the elastic pusher piece 24, the locking boss 11a can slide the elastic pusher piece 24 to release the locking, and after the locking is released, the push lever 1 can move forward in the track to convey the stent 3 and the self-expanding device 6. Of course, after the lock is released, the elastic paddle 24 can be automatically reset due to its own elasticity. When the pushing rod 1 moves to the far end of the track, the pushing rod 1 is rotated again, so that the pushing rod 1 slides through the corresponding elastic shifting piece 24 and is clamped into the corresponding locking clamping groove 23a, and at the moment, the pushing rod 1 is locked with the pusher shell 2 again.

It should be noted that, in order to ensure the locking firmness of the push rod 1, the push rod 1 and the locking boss 11a are of an integral structure.

Further, as shown in fig. 10 and 12, two locking bosses 11a are oppositely arranged, the two locking bosses 11a are oppositely arranged, and the axes thereof are in the same straight line (the straight line passes through the axial center of the push rod 1); the near end and the far end of the track are provided with two locking clamping grooves 23a and two elastic shifting pieces 24, one side of each locking boss 11a is in interference fit with the elastic shifting piece 24, the other side of each locking boss is clamped in the locking clamping groove 23a, the two locking clamping grooves 23a are located on two sides of the locking boss 11a, and the two elastic shifting pieces 24 are located on two sides of the locking boss 11 a. That is, along the circumference of the pusher housing 2, the two locking slots 23a and the two elastic shifting pieces 24 are distributed in a staggered manner at intervals, so that unlocking can be realized by rotating the pushing rod 1 to slide over the elastic shifting pieces 24, and the pushing rod 1 can move along the track after rotating by 90 degrees from a locking state.

As shown in fig. 3 to 6, in the embodiment of the present invention, the pusher housing 2 is a split structure, and includes a first housing 21 and a second housing 22 that are detachably connected, a first rail 212 is disposed in the first housing 21, that is, a first limit bracket (not labeled) is disposed in the first housing 21, the first limit bracket forms an arc-shaped first rail 212, and correspondingly, a second limit bracket (not labeled) is disposed in the second housing 22, the second limit bracket forms an arc-shaped second rail 222, and after the first housing 21 and the second housing 22 are assembled, the first rail 212 and the second rail 222 can be enclosed to form a circular rail.

The first limiting bracket is further provided with two locking clamping grooves 23a, the two locking clamping grooves 23a are located at the far end and the near end of the same side of the first rail 212 respectively, the first limiting bracket is further provided with two first installation spaces (not marked) corresponding to the two locking clamping grooves 23a, and the two first installation spaces are respectively provided with one elastic shifting piece 24, that is, the two elastic shifting pieces 24 are located at the far end and the near end of the other side of the first rail 212.

Correspondingly, the second limiting bracket is further formed with two locking slots 23a, the two locking slots 23a are respectively located at the far end and the near end of the same side of the second rail 222, the second limiting bracket is further formed with two second installation spaces (not labeled) corresponding to the two locking slots 23a, and the two second installation spaces are respectively provided with one elastic shifting piece 24, that is, the two elastic shifting pieces 24 are located at the far end and the near end of the other side of the second rail 222. After the first housing 21 and the second housing 22 are closed, the locking slot 23a in the first housing 21 corresponds to the elastic shifting piece 24 in the second housing 22, and the elastic shifting piece 24 in the first housing 21 corresponds to the locking slot 23a in the second housing 22 (as shown in the structure of fig. 10), so as to ensure that the push rod 1 can be effectively locked, and unlocking can be achieved by rotating the push rod 1.

It should be noted that, in order to ensure the locking stability of the pushing rod 1 and the pusher housing 2, the first limiting bracket, the elastic pulling piece 24 and the first housing 21 are integrated, and the second limiting bracket, the elastic pulling piece 24 and the second housing 22 are integrated.

The detachable connection of the first housing 21 and the second housing 22 may be a snap connection, a screw connection or other reasonable and effective connection, which is not limited herein and falls within the protection scope of the present invention.

In an alternative embodiment of the present invention, a positioning column 221 is disposed in the first housing 21, a positioning hole 211 is correspondingly disposed in the second housing 22, and the positioning column 221 is inserted into the positioning hole 211 to achieve detachable connection between the first housing 21 and the second housing 22. Specifically, two rows of fixing columns are arranged on two sides of the first rail 212 in the first housing 21, each fixing column is provided with a positioning hole 211, and correspondingly, two rows of positioning columns 221 are arranged on two sides of the second rail 222 in the second housing 22, so that the first housing 21 and the second housing 22 can be detachably connected by inserting and fixing the positioning columns 221 into the corresponding positioning holes 211 correspondingly, and the connection is firm.

In the embodiment of the invention, the proximal end of the leading-in sheath 4 is bonded and fixed on the inner wall of the sheath joint 5, and the mode has simple operation and firmer connection.

As shown in fig. 7, a connection hole 511 is provided in the knob 51 of the sheath connector 5, a connection barrel 25 is provided at the distal end of the pusher housing 2, the connection barrel 25 is substantially cylindrical, and the connection barrel 25 is fixed in the connection hole 511 by clipping, so that the sheath connector 5 is locked with the pusher housing 2.

In the embodiment of the invention, the push rod 1 is in a circular tube shape, the extending end of the expander 3 is bonded and fixed on the inner wall of the push rod 1 through glue, so that the push rod 1 and the expander 3 are fixedly connected, and the connection mode is firm and simple to operate.

In the embodiment of the present invention, as shown in fig. 2, the proximal end of the push rod 1 is provided with a luer 12, and the luer 12 is a connector having a groove or a protrusion to facilitate connection with a syringe for injecting liquid during operation, and can effectively prevent leakage.

Further, a handle 13 is arranged on the push rod 1, and the handle 13 is arranged to facilitate movement or selection of the push rod 1.

As shown in fig. 7 to 9, when assembling the dilator assembly, the proximal end of the introducing sheath 4 is inserted into the sheath connector 5, and is bonded with glue, the distal end of the dilator 3 is inserted into the knob 51 of the sheath connector 5 until it exceeds the distal self-expanding device 6 of the introducing sheath 4, so that the self-expanding device 6 is hidden in the distal gap of the dilator 3, the dilator 3 is inserted into the second housing 22 of the pusher housing 2, and is inserted into the inner space of the distal end of the push rod 1 after a proper amount of glue is applied to the proximal end of the dilator 3, and is fixed, and after the fixation is completed, the locking boss 11a at the distal end of the push rod 1 is placed into the second track 222, the proximal elastic pick 24 and the locking slot 23a in the second housing 22 of the pusher housing 2, as shown in fig. 9; next, aligning a positioning hole 211 in the first shell of the pusher housing 2 with a positioning post 221 in the second shell to insert, at this time, the elastic poking pieces 24 in the first shell and the second shell are in interference fit with one side of the locking boss 11a of the push rod 1, the other side of the locking boss 11a is located in the corresponding locking clamping groove 23a, at this time, the push rod 1 cannot move back and forth, and the push rod 1 and the pusher housing 2 are in a locking state, as shown in fig. 10; then, the connecting tube 25 at the distal end of the pusher housing 2 is inserted into the connecting hole 511 in the knob 51 of the sheath joint 5 with a force of 10-15N, so that the pusher housing 2 and the sheath joint 5 are kept locked, and at this time, the sheath joint 5, the dilator 3, the pusher housing 2, and the push rod 1 are all in a locked state, and the assembly is completed, as shown in fig. 11.

During operation, in the process of inserting the dilator assembly into a blood vessel of a human body, the dilator 3 is always kept in a locking state with the guiding sheath 4 by virtue of the push rod 1, the pusher housing 2 and the sheath joint 5, so that the injury of a blood vessel wall in the process of entering the dilator 3 into the human body and the operation obstacle caused by the injury are avoided, after the distal end of the dilator 3 enters the human body and reaches a designated position, the handle 1390 degree of the push rod 1 is rotated anticlockwise by 10-15N of force, the locking boss 11a at the distal end of the push rod 1 slides over the corresponding elastic poking piece 24 to enter a track, and at the moment, the push rod 1, the dilator 3 and the pusher housing 2 are unlocked, as shown in fig. 12; the pusher rod 1 is pushed forward until the distal end of the track, releasing the self-expanding device 6, as shown in fig. 1, and the self-expanding device 6 prevents thrombus fragments from being generated during the operation and causing the distal embolism. After the self-expansion device 6 is released, the handle 1390 degree of the pushing rod 1 is rotated clockwise by 10-15N force, the locking lug boss 11a at the far end of the pushing rod 1 slides through the corresponding elastic shifting piece 24 and enters the corresponding locking clamping groove 23a, and the pushing rod 1 cannot move and is locked again; finally, the pusher housing 2 is forcibly pulled out of the knob 51 of the sheath connector 5, and the dilator 3 and pusher are removed.

In another embodiment of the present invention, the structure of the pusher is as shown in fig. 13 to 19, in this embodiment, the distal end of the pushing rod 1 is provided with an annular boss 11b, the proximal end and the distal end of the rail are both provided with an annular slot 23b, and the annular slot 23b is coaxially arranged with the rail and is communicated with the rail; the annular boss 11b is clamped and locked with the annular clamping groove 23b, so that the pushing rod 1 is locked with the pusher shell 2; the pushing rod 1 is pushed by force, the annular boss 11b can be separated from the annular clamping groove 23b, locking between the pushing rod 1 and the pusher shell 2 is further released, and the pushing rod 1 can move along the rail after the locking is released.

In this embodiment, the pusher housing 2 is cylindrical, the inner track is substantially circular, the pushing rod 1 is tubular, the annular boss 11b is a circular boss, the annular clamping groove 23b is an annular clamping groove 23b, and the two are clamped and locked with each other.

The mode of clamping and locking the annular boss 11b and the annular clamping groove 23b can be as follows: the internal diameter of ring groove 23b and the external diameter looks adaptation of annular boss 11b, and ring groove 23 b's inner wall is provided with the annular arch, the internal diameter of annular protruding structure 231 slightly is less than the external diameter of annular boss 11b, annular boss 11b sets up to the elasticity boss, annular boss 11b can the joint lock in annular protruding structure 231 one side ring groove 23b of track dorsad like this, and annular boss 11b butt in the side of annular protruding structure 231, as shown in fig. 15 to 19 in order to realize the locking of propelling movement pole 1 and pusher shell 2, and because annular boss 11b sets up to the elasticity boss, then with power promote propelling movement pole 1 alright make annular boss 11b pass and break away from annular protruding structure 231, in order to realize removing the locking. Naturally, in order to ensure that the pushing rod 1 passes through the annular protrusion 231 more smoothly, the annular protrusion 231 may have a gradual shape with a smaller inner diameter at a middle position and larger positions at two sides.

Of course, the snap locking mode can also be as follows: annular slot 23b is the gradual change groove, and the internal diameter of the annular slot 23b of near-end reduces to the near-end by the distal end promptly gradually, and the internal diameter of the annular slot 23b of distal end reduces to the distal end by the near-end gradually, and at orbital near-end and distal end like this, annular boss 11b all the joint is fixed in annular slot 23 b's little internal diameter department (promptly with annular boss 11 b's external diameter looks adaptation department) to realize the locking of the two joint, and can remove annular boss 11 b's locking through the big internal diameter removal of push rod 1 towards annular slot 23 b. In addition, the clamping locking mode can also be as follows: the size of ring-shaped clamping groove 23b is matched with that of ring-shaped boss 11b, so that ring-shaped boss 11b can be clamped and locked in ring-shaped clamping groove 23b, and the locking can be released by forcibly pushing ring-shaped boss 11 b.

Before use, the push rod 1 is pulled to the annular clamping groove 23b at the proximal end of the pusher shell 2 with a force of 10-15N, and the annular boss 11b at the distal end of the push rod 1 is pulled into the annular clamping groove 23b to be locked, as shown in fig. 15 and 16; the pushing rod 1 is pushed to make the annular boss 11b separate from the annular clamping groove 23b, the locking is released, and the pushing rod enters the track to move forwards until the annular boss 11b enters the annular clamping groove 23b at the far end of the pusher housing 2 and is locked again, as shown in fig. 17 to 19.

It should be noted that the pusher housing 2 of this embodiment may be a separate structure, and the connection manner of the separate structure may refer to the pusher housing 2 of the above embodiment, and in addition, the assembly of the dilator 3, the introducing sheath 4, and the self-expanding device 6 of this embodiment may refer to the above embodiment, and details thereof are not repeated.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dilator assembly, comprising:

the proximal end of the dilator extends into the pusher housing and is fixedly connected to the push rod;

the guiding sheath tube is connected to the far end of the pusher shell through a sheath tube joint;

2. The dilator assembly of claim 1, wherein the push rod is locked with the pusher housing at both the proximal and distal ends of the track by a fit of a boss and a catch.

3. The dilator assembly of claim 2, wherein a distal end of the push rod is provided with a locking boss, a proximal end and a distal end of the track are provided with a locking slot and an elastic pick, the locking slot and the elastic pick are respectively located at two sides of the track, one side of the locking boss is in interference fit with the elastic pick, and the other side is clamped in the locking slot, so that the push rod is locked with the pusher housing;

4. The dilator assembly of claim 3, wherein the two locking bosses are oppositely arranged, the two locking slots and the two elastic shifting pieces are respectively arranged at the near end and the far end of the track, one side of each locking boss is in interference fit with the elastic shifting piece, the other side of each locking boss is clamped in the locking slot, the two locking slots are positioned at two sides of the locking boss, and the two elastic shifting pieces are positioned at two sides of the locking boss.

5. The dilator assembly of claim 2, wherein the distal end of the push rod is provided with an annular boss, the proximal end and the distal end of the track are each provided with an annular groove, and the annular grooves are coaxially arranged with the track and are communicated with the track;

6. The expander assembly of claim 5, wherein the annular boss is an elastic boss, an inner diameter of the annular clamping groove is matched with an outer diameter of the annular protrusion, an inner wall of the annular clamping groove is provided with an annular protrusion structure, the inner diameter of the annular protrusion structure is smaller than the outer diameter of the annular boss, and the annular boss is clamped and locked in the annular clamping groove at one side of the annular protrusion structure, which faces away from the track, so that the push rod is locked with the pusher housing;

7. The dilator assembly of claim 1, wherein the pusher housing comprises a first housing and a second housing that are removably coupled, the first housing having a first track disposed therein, the second housing having a second track disposed therein, the first track and the second track enclosing to form a track.

8. The dilator assembly of claim 7, wherein a positioning post is disposed in the first housing, and a positioning hole is correspondingly disposed in the second housing, and the positioning post is inserted into the positioning hole.

9. The dilator assembly of any one of claims 1-8, wherein a proximal end of the introducer sheath is adhesively secured to an inner wall of the sheath connector;

and/or a connecting hole is formed in a knob of the sheath pipe joint, a connecting cylinder is arranged at the far end of the pusher shell, and the connecting cylinder is clamped and fixed in the connecting hole, so that the sheath pipe joint is connected with the pusher shell in a locking mode.

10. The dilator assembly of any one of claims 1 to 8, wherein the push rod is tubular, and the protruding end of the dilator is adhesively secured to the inner wall of the push rod;

and/or a luer connector is arranged at the proximal end of the push rod; the push rod is also provided with a handle.