CN113599040B

CN113599040B - Front-end rear-release mechanism of interventional stent conveyor, conveyor and use method

Info

Publication number: CN113599040B
Application number: CN202111091264.9A
Authority: CN
Inventors: 于学保; 许尚栋; 赵国行; 伍源; 付天翔; 刘冰; 崔跃
Original assignee: Beijing Youzhuo Zhenglian Medical Technology Co ltd
Current assignee: Beijing Youzhuo Zhenglian Medical Technology Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2024-03-08
Anticipated expiration: 2041-09-17
Also published as: CN113599040A

Abstract

A front-end and back-release mechanism of an interventional stent conveyor, the conveyor and a use method are provided, a movable claw capable of axially moving on a first limiting piece is arranged on a front-end assembly, and the movable claw is connected with a metal block of a rear-end assembly of the conveyor through wire drawing, so that a front-end and back-release function of the interventional stent is realized. And the rear end assembly realizes the positioning locking and axial movement of the release sleeve and the screw rod through the guide locking mechanism arranged on the release sleeve and the screw rod, so that the positioning locking and axial movement of the movable claw on the first limiting part are realized, the problem that the intervention bracket is released in advance caused by the advance unlocking of the movable claw can be avoided, and meanwhile, the problem that the intervention bracket cannot be released caused by the incapability of unlocking of the movable claw can be avoided. The guide locking mechanism is designed into a guide post and an L-shaped guide groove arranged on the outer surface of the screw rod, so that the front-end rear release mechanism is ensured to be safe in self-locking and quick in unlocking, and the safety, reliability and positioning accuracy of the conveyor are further improved.

Description

Front-end rear-release mechanism of interventional stent conveyor, conveyor and use method

Technical Field

The invention relates to the technical field of medical equipment, in particular to a front-end and rear-end release mechanism of an interventional stent conveyor, the conveyor and a using method.

Background

Aortic dissection is an acute aortic disease with serious illness, rapid progress and high mortality rate, and the incidence rate of the aortic dissection is about 5-20% of common people. For lesions limited in descending aorta, the clinical intervention operation of a covered stent is the current main treatment scheme, namely, the covered stent is pressed and held in a conveyor, is sent to a lesion part along a guide wire through a femoral incision access, and is withdrawn from an outer sheath tube of the conveyor, the stent is self-expanded and opened, a vessel wall is attached, and blood flow in an aortic dissection or tumor cavity is isolated, so that the treatment purpose is achieved. The whole operation process is carried out under the normal condition of the heart without stopping the jump and the blood circulation.

The aortic tectorial membrane stent system is a medical instrument designed for aortic endoluminal isolation and consists of an tectorial membrane stent and a conveyor. The design of the conveyor determines the release mode and the positioning accuracy of the stent, and has important influence on the operation hand feeling of operators and the accurate release of the stent.

And when the head 2-3 knots of the proximal end of the bracket are released, slow release is adopted to obtain the opportunity of position adjustment and accurate positioning. To avoid displacement of the stent under the impact of blood flow, the first section of the proximal end of the stent, i.e., the bare stent portion, is constrained to the front end of the conveyor. The accurate positioning of the bracket can be ensured only by controlling the position of the conveyor so that the conveyor does not move relative to the blood vessel. When the stent covered section is completely opened, a distal end mechanism of the outer part of the conveyor can be operated, a mechanism for restraining the bare stent is opened, stent release is completed, and the conveyor is withdrawn. The designed part of the conveyor which can realize the front end restraint and the external unlocking release of the bracket is called a front end and rear release mechanism.

The front-end rear release mechanism is at least of a double-layer structure, and is matched with other structures such as a middle tube, so that the front-end rear release mechanism is required to be tightly connected, and can move relatively smoothly, and when the front-end rear release mechanism is deformed through excessive bending angiogenesis, the rear release mechanism is prevented from being blocked relatively between matched parts and cannot be opened. The front-end rear release mechanism is typically composed of a rigid material that cannot bend, and should be as reduced in size as possible in the axial direction of the conveyor to avoid difficulties in navigating through a tortuous vessel. The rear release mechanism should also have a stable locking design to prevent premature unlocking during transport.

Disclosure of Invention

The invention provides a front-end and rear-end release mechanism of an interventional stent conveyor, the conveyor and a using method thereof. And the rear end assembly realizes the positioning locking and axial movement of the release sleeve and the screw rod through the guide locking mechanism arranged on the release sleeve and the screw rod, so that the positioning locking and axial movement of the movable claw on the first limiting part are realized, the problem that the intervention bracket is released in advance caused by the advance unlocking of the movable claw can be avoided, and meanwhile, the problem that the intervention bracket cannot be released caused by the incapability of unlocking of the movable claw can be avoided.

The technical scheme of the invention is as follows:

a front-end and back-release mechanism of an interventional stent conveyer, which comprises

The front end assembly comprises a first limiting piece, a movable claw sleeved on the first limiting piece and a second limiting piece, wherein a claw groove matched with the claw of the movable claw is formed in the first limiting piece, the proximal end of the first limiting piece is fixed on the guide head, and the axial sliding distance of the movable claw is limited in the length range of the first limiting piece through the second limiting piece at the distal end;

the rear end assembly comprises a metal block and a release sleeve, wherein the metal block is axially positioned in a metal block annular groove in the release sleeve and can only rotate in the metal block annular groove;

then releasing wire drawing, wherein one end of the wire drawing is fixed on the movable claw, and the other end of the wire drawing is fixed on the metal block;

the release sleeve is sleeved on the screw rod, and the positioning locking and the axial movement of the release sleeve and the screw rod are realized through the guide locking mechanism arranged between the release sleeve and the screw rod, so that the positioning locking and the axial movement of the moving claw on the first limiting piece are realized.

Preferably, the guide locking mechanism comprises a guide pillar and an L-shaped guide groove arranged on the outer surface of the screw, wherein the guide pillar comprises a positioning column and at least two elastic guide claws arranged at one end of the positioning column; the long support arm of the L-shaped guide groove is axially arranged along the screw rod and is in clearance fit with the elastic guide claw; the short support arm of the L-shaped guide groove is arranged along the circumferential direction of the screw rod and is in interference fit with the elastic guide claw; the short support arm is provided with a guide groove fixing hole in an extending mode, and the guide groove fixing hole is in clearance fit with the elastic guide claw.

Preferably, the upper end and the lower end of the metal block are positioning cambered surfaces which are in clearance fit with the inner cylindrical surface of the ring groove of the metal block; the metal block comprises a cutting groove extending from top to bottom through the axis of the cutting groove, and the cutting groove divides the metal block into two half parts which are connected at the lower end only; the wire drawing is fixed in a wire drawing hole in the cutting groove.

Preferably, the rear end assembly further comprises a holding sleeve sleeved and fixed on the outer surface of the screw, a locking indicator and an unlocking indicator are arranged on the outer surface of the distal end of the holding sleeve, and a position indicator for indicating the rotation position of the release sleeve is arranged on the outer surface of the proximal end of the corresponding release sleeve; the included angle between the locking indicator and the unlocking indicator is related to the circumferential length of the short support arm.

Preferably, the inner hole of the release sleeve comprises a first screw rod hole section, a metal block ring groove and a second screw rod Kong Duanhe luer taper joint hole section from the proximal end to the distal end in sequence; the first screw hole section and the second screw hole section are in sliding sleeve connection with a release sleeve shaft of the screw; the distal end of the screw rod is fixedly connected with the luer taper joint through a luer taper threaded shaft, and the luer taper joint hole section is in sliding sleeve joint with the outer side of the luer taper joint.

Preferably, the rear end assembly further comprises a middle pipe joint fixed in the screw rod, a middle pipe fixing hole for accommodating and fixing a middle pipe is formed in the middle pipe joint, a core pipe penetrates through a core pipe through hole of the middle pipe, and the middle pipe further comprises a wire drawing through hole which is parallel to the core pipe through hole; the axis positions of the metal blocks are provided with core tube holes and wire drawing holes corresponding to the core tube through holes and the wire drawing through holes; the two halves of the metal block are provided with wire drawing fastening screw holes for screwing the wire drawing fastening screws.

Preferably, the outer side surface of the middle pipe joint is symmetrically provided with limiting columns in a radial extending mode, and the limiting columns are provided with radial through holes; the radial through hole is a threaded hole with the axis perpendicular to the middle pipe joint, and the set screw is screwed into the radial through hole to lock the middle pipe; and a middle pipe joint limiting hole for fixing the limiting column is also formed in the screw.

Preferably, the first limiting piece sequentially comprises a threaded shaft, a front disc transition shaft, a rear disc and a claw shaft from the proximal end to the distal end, claw grooves matched with the claw bodies are formed in the front disc and the rear disc, and the length of the claw bodies is equal to the total length of the front disc, the transition shaft and the rear disc; the far end of the claw body is internally provided with a claw head in an extending way, a central hole of the claw head is sleeved on the claw shaft, and the total length of the claw body and the claw head is equal to the total length of the rear disc and the claw shaft; a wire drawing fixing hole is formed between the two claw bodies of the claw head; the claw shaft is provided with a sleeve ring shaft in an extending mode at the far end, wire drawing grooves are formed in the outer surfaces of the claw shaft and the sleeve ring shaft, and the second limiting piece is sleeved on the sleeve ring shaft.

Preferably, the length of the long arm is greater than the total length of the front plate and the transition shaft.

An interventional stent delivery device comprising the front-end rear release mechanism, further comprising:

the distal end of the guide head is fixed on a threaded shaft of a first limiting part of the front-end rear release mechanism;

the far end of the screw is sequentially provided with the holding sleeve shaft, the releasing sleeve shaft and the luer taper threaded shaft;

the proximal end of the sheath tube is in sliding sleeve connection with the guide head, and the distal end of the sheath tube is in sliding connection with the screw rod through a sheath tube joint;

the core tube, one end is fixed to the said guide head, another end is fixed to the luer taper;

the proximal end of the middle tube at least extends out of the proximal end of the screw rod, and the distal end of the middle tube is fixed on the screw rod through a middle tube joint; the axis department is equipped with the core tube through-hole that is used for wearing to establish the core tube, the outside of core tube through-hole is equipped with the wire drawing through-hole that is used for wearing to establish the wire drawing.

Preferably, the interventional stent conveyor further comprises a handle 400 capable of realizing quick and slow release, wherein the handle 400 comprises a handle shell and a screw sleeve in the handle shell, one end of the handle shell is provided with an axial extension part of the screw sleeve, and the axial extension part is provided with a cam ring quick and slow switching mechanism; the cam ring speed switching mechanism comprises a cam ring and a telescopic tooth plate; the telescopic tooth plate extends inward along the radial direction of the cam ring and is provided with a tooth body; the outer surface of the telescopic tooth plate is in contact connection with the concave-convex inner surface of the cam ring; the tooth bodies are positioned in the radial through holes of the screw rod sleeve and can extend out of the radial through holes to be in meshed connection with threads on the screw rod arranged in the screw rod sleeve so as to realize sliding type rapid movement and rotating type slow movement of the screw rod sleeve along the screw rod; the inner hole of the cam ring is symmetrically distributed with a pair of shallow arc grooves and a pair of deep arc grooves along the circumferential center to form the concave-convex inner surface; the tooth body is an inner trapezoidal thread matched with the trapezoidal thread of the screw rod; the difference between the radial groove depths of the shallow arc grooves and the deep arc grooves is not smaller than the tooth height; the screw sleeve sequentially comprises a first shaft section, a second shaft section, a positioning shoulder and a third shaft section; the outer diameters of the first shaft section, the second shaft section and the positioning shoulder are sequentially increased; the cam ring is in clearance fit with the second shaft section, and axial positioning is realized through the positioning shoulder and the clamping ring fixed on the first shaft section; the handle housing is secured to the third shaft section.

Preferably, the handle further comprises an arc-shaped cutting sleeve, wherein the arc-shaped cutting sleeve comprises a sheath sleeve positioning hole section, a screw positioning hole section and a button hole section, the inner diameters of which are sequentially increased, and two buttons are symmetrically arranged on the button hole section; one end of the button is connected with the wall of the screw positioning hole section, the other end of the button extends to the edge of the button hole section along the axial direction, a clamping hook is continuously arranged in an extending mode, and the clamping hook is clamped in a G-shaped groove of the clamping ring; a limiting block axially extends from the side of the guide hole of the cam ring, and an arc limiting groove is formed in the end face of the corresponding screw sleeve positioning shoulder; the limiting block slides in the arc-shaped limiting groove along with the rotation of the cam ring, and two limiting positions of the limiting block sliding in the arc-shaped limiting groove correspond to the outer surface of the telescopic tooth plate to be positioned at the bottom of the shallow arc-shaped groove and the bottom of the deep arc-shaped groove respectively; the telescopic dental plate comprises a dental plate and a reed, and a reed hole is formed in the center of the dental plate; the reed is an arc-shaped spring piece penetrating through the reed hole, the supporting leg of the reed faces inwards, and the arc-shaped bow top of the reed abuts against the top of the reed hole; the corresponding screw rod sleeve is provided with reed grooves which are crossed with the radial through holes in a crisscross manner; the reed groove is preferably a blind groove, and the supporting legs of the reed are pressed in the reed groove through the dental lamina and the cam ring; the outer surface of the cam ring is opposite to the position of the shallow arc-shaped groove, and an indicating position mark is arranged; a quick sliding movement mark and a slow rotating movement mark are arranged on the corresponding handle shell; the included angle between the shallow arc-shaped groove and the deep arc-shaped groove is 50 degrees, and the included angle between the two limit positions of the corresponding arc-shaped limiting groove is 50 degrees; the included angle between the fast sliding movement mark and the slow rotating movement mark is 50 degrees.

Preferably, the handle further comprises a sheath pipe joint, and a sheath pipe connecting section of the sheath pipe joint is used for fixing a sheath pipe through a sheath pipe lock nut; a guide plate is arranged on the outer peripheral surface of the sheath pipe joint; the guide plate is a near T-shaped guide plate, and a vertical section of the guide plate passes through a sheath pipe joint guide groove on the screw rod and moves in the sheath pipe joint guide groove so as to drive the sheath pipe to move along the axial direction; the horizontal section of the guide plate is clamped between the screw sleeve and the second handle; the sheath pipe joint is provided with a middle pipe through hole for accommodating the middle pipe along the axial direction; the tail end of the middle tube through hole is used for sealing and fixing the middle tube on the sheath tube joint through a sealing ring and a sealing screw sleeve.

The application method of the interventional stent conveyor with the front-end and rear-release mechanism is characterized by comprising the following steps of:

a bracket ring at the proximal end of the intervention bracket is fixed to the first limit transition shaft by the movable claw and the claw groove; the release sleeve is attached to the holding sleeve, the position mark of the release sleeve points to the locking indicator mark of the holding sleeve, the guide claw of the guide pillar is positioned in the guide groove fixing hole of the screw rod, and at the moment, the distance between the metal block and the movable claw is just equal to the length of the release wire drawing;

S502, holding the holding sleeve by a left hand, holding the releasing sleeve by a right hand, rotating the releasing sleeve to enable the position mark of the releasing sleeve to rotate from a locking indicator to an unlocking indicator of the holding sleeve 730, and at the moment, rotating the guide claw of the guide post from the guide groove fixing hole to the proximal end of the long support arm through the short support arm;

s503, withdrawing the release sleeve, wherein the guide claw of the guide post slides from the proximal end to the distal end of the long support arm, and simultaneously drives the metal block, the wire drawing and the moving claw to withdraw until the claw head of the moving claw moves to the proximal end of the second limiting piece and is further limited; the total length of the claw body and the claw head is equal to the total length of the rear disc and the claw shaft, and the claw body is completely separated from the transition shaft at the moment, so that the bracket ring clamped on the transition shaft is released, and the front end rear release process of the intervention bracket is completed.

The application method of the interventional stent conveyor with the front-end rear-release mechanism and the handle is characterized by comprising the following steps:

s1, in an initial state, a bracket ring at the proximal end of an intervention bracket is fixed to a transition shaft of the first limiting piece by the movable claw and the claw groove, and is integrally folded in a sheath tube, the proximal end of the sheath tube is sleeved on the guide head, and the movable claw is completely clamped in the claw groove;

The clamping hook of the arc clamping sleeve is hooked and locked with the G-shaped groove of the clamping ring, the triangular position mark on the cam ring points to the slow rotation moving mark S on the handle shell, the limiting block on the cam ring is positioned at the left end of the arc limiting groove of the screw sleeve, the top arcs of the two dental plates are positioned in the shallow arc groove of the cam ring, the dental plates are pressed down by the shallow arc groove and move downwards along the radial through hole on the screw sleeve, the reed supported in the reed groove is pressed down by the dental plates to be flattened, and the dental body is meshed with the trapezoidal threads on the screw;

the release sleeve is attached to the holding sleeve, the position mark of the release sleeve points to the locking indicator mark of the holding sleeve, the guide claw of the guide pillar is positioned in the guide groove fixing hole of the screw rod, and at the moment, the distance between the metal block and the movable claw is just equal to the length of the rear release wire drawing;

s2, sending the intervention stent to a designated position;

s3, in the slow release process, two buttons on the arc-shaped clamping sleeve are pressed down, the two clamping hooks are separated from the clamping ring to unlock, at the moment, the handle shell is rotated, the dental plate can do spiral motion in the trapezoidal threads of the screw rod, and the dental plate can drive the screw rod sleeve, the handle shell, the sheath pipe joint and the sheath pipe to slowly move along the axial direction of the screw rod, so that the slow release of the intervention support is realized and completed;

S4, in the quick release process, the cam ring is shifted to enable the cam ring to rotate to the triangular position mark pointing to the quick movement mark F; at the moment, a limiting block of the cam ring is positioned at the right end of an arc limiting groove of the screw sleeve, the two dental plates rotate to the position of a deep arc groove of the cam ring, and the two compressed reeds jack the two dental plates until the top arc of the dental plates is tangent with the arc top of the deep arc groove; at the moment, the dental lamina is disengaged from the screw rod, and the handle shell is quickly withdrawn along the screw rod, so that the screw rod sleeve, the sheath pipe joint and the sheath pipe can be driven to quickly move along the axial direction of the screw rod, thereby realizing and completing the quick release of the intervention bracket;

s5, in the front end rear release process, after the intervention stent is released quickly, only a stent ring at the left proximal end of the intervention stent is fixed to the transition shaft of the first limiting piece by the movable claw and the claw groove; the release sleeve is rotated to enable the position mark of the release sleeve to rotate from the locking indicator to the unlocking indicator of the holding sleeve, and meanwhile, the guide claw of the guide post rotates from the guide groove fixing hole to the proximal end of the long support arm through the short support arm; because the metal block is in clearance fit with the metal block ring groove of the release sleeve, the metal block cannot drive the wire drawing to rotate; then, the release sleeve is retracted, the guide claw of the guide post slides from the proximal end to the distal end of the long support arm, and simultaneously, the metal block, the wire drawing and the moving claw are driven to retract until the claw head of the moving claw moves to the proximal end of the second limiting piece and is further limited; the total length of the claw body and the claw head is equal to the total length of the rear disc and the claw shaft, and the claw body is completely separated from the transition shaft at the moment, so that a bracket ring clamped on the transition shaft is released, and the front end rear release process of the intervention bracket is completed;

S6, in the guide head locking stage, the cam ring is determined to be in a quick release position, the arc-shaped clamping sleeve is retracted, when the clamping hook inclined surface is in contact with the clamping ring, the clamping hook is extruded and bent downwards by the clamping ring until the clamping hook slides into the G-shaped groove of the clamping ring and is hooked and locked with the clamping ring again, and at the moment, the distal end of the guide head returns to the sheath tube and is locked;

and S7, withdrawing the whole conveyor.

Compared with the prior art, the invention has the advantages that:

1. according to the front-end and rear-release mechanism of the interventional stent conveyor, the conveyor and the using method, the front-end assembly is provided with the movable claw capable of axially moving on the first limiting piece, and the movable claw is connected with the metal block of the rear-end assembly of the conveyor through wiredrawing, so that the front-end and rear-release function of the interventional stent is realized. And the rear end assembly realizes the positioning locking and axial movement of the release sleeve and the screw rod through the guide locking mechanism arranged on the release sleeve and the screw rod, so that the positioning locking and axial movement of the movable claw on the first limiting part are realized, the problem that the intervention bracket is released in advance caused by the advance unlocking of the movable claw can be avoided, and meanwhile, the problem that the intervention bracket cannot be released caused by the incapability of unlocking of the movable claw can be avoided.

2. According to the front-end and rear-release mechanism of the interventional stent conveyor, the conveyor and the using method, the guide locking mechanism is designed into the guide post and the L-shaped guide groove arranged on the outer surface of the screw rod, so that the front-end and rear-release mechanism is ensured to be safe in self-locking and quick in unlocking.

3. According to the front-end and rear-release mechanism of the interventional stent conveyor, the conveyor and the using method, the front-end assembly is opened in a wiredrawing design, so that the volume of a core tube part is reduced, the loading space of the stent is increased, and the diameter of an outer sheath tube of the conveyor is reduced.

4. According to the front-end and rear-release mechanism of the interventional stent conveyor, the conveyor and the using method, the handle is provided with the screw sleeve and the cam ring quick-slow switching mechanism arranged at the axial extension part of the screw sleeve, the cam ring quick-slow switching mechanism comprises the cam ring and the telescopic tooth plates, so that the stent is released slowly and quickly, the switching mode does not distinguish the circumferential direction of the handle, the operation is convenient, and more attention of a clinical operator is focused on an observation screen released by the stent.

5. According to the front-end and rear-end release mechanism of the intervention support conveyor, the conveyor and the using method, the triangular position mark on the cam ring points to the S of the handle shell, the limiting block on the cam ring is positioned at the left end of the arc-shaped limiting groove, the top arcs of the two dental plates are positioned in the shallow arc-shaped groove and are pressed down by the shallow arc-shaped groove, so that the dental bodies are meshed with the trapezoidal threads on the screw rod, the handle shell is rotated, the dental plates do spiral movement in the trapezoidal threads of the screw rod, and the screw rod sleeve, the sheath pipe joint and the sheath pipe are pushed to slowly move along the axial direction of the screw rod, so that the slow release of the intervention support is realized. After releasing in place, the cam ring is rotated by simply poking the cam ring, when the triangular position mark points to the quick movement mark F, the limiting block is positioned at the right end of the arc limiting groove, the two dental plates rotate to the deep arc groove position, and the two compressed reeds jack the two dental plates to be tangent with the arc top of the deep arc groove; the tooth plate is disengaged from the screw rod, the handle shell is quickly retracted along the screw rod, and the screw rod sleeve, the sheath pipe joint and the sheath pipe are driven to quickly move along the axial direction of the screw rod, so that the intervention support is quickly released. And no matter which release state is in, the reed can always push the dental lamina to the deep arc-shaped groove position or the shallow arc-shaped groove position, so that the dental lamina can not automatically compress the reed to enter into another arc section from one arc section, the cam ring is manually stirred, and the handle can not be automatically switched between the quick and slow release states, so that the whole handle is safe and reliable to use.

6. According to the front-end rear-release mechanism of the intervention support conveyor, the conveyor and the using method, after the intervention support is conveyed to the designated position, the clamping hooks are separated from the clamping rings and unlocked by pressing the two buttons on the arc-shaped clamping sleeve, so that the sheath tube and the guide head can be separated. After the intervention support is released, the arc-shaped clamping sleeve is retracted, so that the clamping hook clamping ring is hooked and locked again. At this time, the backward withdrawing and conveying system is free from causing the guide head and the backward releasing mechanism to separate from the sheath no matter which part of the handle is held by hand, no matter whether the handle is pulled backward or rotated backward, and further avoiding the backward releasing mechanism from scratching the vascular intima, and avoiding the size mutation and difficult operation when the sheath, the backward releasing mechanism and the guide head are withdrawn from the femoral incision in sequence.

Drawings

FIG. 1 (a) is a schematic three-dimensional structure of a front end assembly of a release mechanism behind the front end of an interventional stent transporter in a completely released state of the interventional stent, wherein a moving jaw moves to be completely separated from a transition shaft, that is, in the completely released state of the interventional stent;

FIG. 1 (b) is a schematic cross-sectional view of FIG. 1 (a) after axially half-sectioning;

FIG. 2 (a) is a schematic three-dimensional view of the front end assembly of the release mechanism of the present invention in an initial state after insertion into the front end of a stent delivery device;

FIG. 2 (b) is a schematic cross-sectional view of the structure of FIG. 2 (a) after being axially half-sectioned;

FIG. 3 is a schematic three-dimensional view of a first stop member of a release mechanism behind the front end of an interventional stent delivery device according to the present invention;

FIG. 4 is a schematic three-dimensional view of the moving jaw of the release mechanism behind the front end of the interventional stent delivery of the present invention;

FIG. 5 is a schematic view of the rear end assembly of the present invention in relation to the front end rear release mechanism of the stent delivery device;

FIG. 6 is a schematic diagram of a front view of a guide post of an interventional stent delivery device according to the present invention;

FIG. 7 is a schematic view of the structure of the screw of the interventional stent conveyor of the present invention;

FIG. 8 is a schematic diagram of the mating structure of the guide post and the L-shaped guide slot of the interventional stent conveyor of the present invention;

FIG. 9 is a schematic view of the structure of a metal block of an interventional stent transporter of the present invention;

FIG. 10 is a schematic view of the structure of the stent delivery gripping sleeve of the present invention;

FIG. 11 is a schematic view of the structure of the release sheath of the interventional stent delivery device of the present invention;

FIG. 12 is a schematic three-dimensional schematic view of a tube joint in an interventional stent delivery device and a schematic cross-sectional schematic view of a middle tube in front view according to the present invention;

FIG. 13 is a schematic view of the handle structure of the present invention;

FIG. 14 is a schematic view of the structure of the handle cam ring of the present invention;

FIG. 15 is a schematic three-dimensional view of a handle screw sleeve according to the present invention;

FIG. 16 is a schematic view of the structure of the handle telescoping dental plate of the present invention;

FIG. 17 is a schematic view of the handle arc ferrule of the present invention

FIG. 18 is a schematic view of the arcuate handle snap ring of the present invention;

FIG. 19 is a schematic cross-sectional view of 3 mating structures of the handle arc ferrule and snap ring of the present invention;

FIG. 20 is a schematic view of the handle sheath adapter of the present invention;

FIG. 21 is a schematic three-dimensional view of one embodiment of an interventional stent delivery device according to the present invention;

fig. 22 is a schematic view of the three states of the intervention stent transporter according to the present invention in use.

The reference numerals in the figures are:

100-a guide head, 2-an interventional stent,

200-front end components, 210-first limiting members, 211-threaded shafts, 212-front disks, (2121, 2141) -claw grooves, 213-transition shafts, 214-rear disks, 215-claw shafts, 216-collar shafts, 217-wire drawing grooves, 218-inner holes, 220-movable claws, 221-claw bodies, 222-claw heads, 223-central holes, 224-wire drawing fixing holes, 230-second limiting members,

300-the sheath tube,

400-handle, 410-handle housing, 420-screw sleeve, 421-first shaft section, 422-second shaft section, 423-locating shoulder, 424-third shaft section, 4221-radial through hole, 4222-reed slot, 4231-arc limit slot, 430-cam ring quick and slow switching mechanism, 431-cam ring, 431A-guide section, 431B-cam section, 4311-shallow arc slot, 4312-deep arc slot, 4313-triangular position mark, 432-telescoping dental plate, 4322-dental plate, 43221-reed hole, 4323-reed, 4321-dental body, 433-stopper, 440-sheath moving device, 441-sheath tube joint, 4411-sheath tube connecting section, 4412-transition section, 4413-guide plate, 4414-sealing hole, 442-sheath lock nut, 450-snap ring, 451-G type slot, 452-locating hole, 460-arc shape, 461-462-sheath locating hole section, 463-button hole section, 464-button, 465-480-snap ring, 490-sealing sleeve,

500-screw, 510-first positioning shaft, 511-sheath sleeve positioning hole, 520-button shoulder, 521-button slot, 530-trapezoidal thread shaft, 531-sheath tube joint guiding groove, 540-grip sleeve shaft, 541-middle tube joint limiting hole, 542-extension tube seat hole, 550-release sleeve shaft, 551-L guiding groove, 5511-long support arm, 5512-short support arm, 5513-guiding groove fixing hole, 552-metal block guiding groove, 560-luer taper thread shaft,

and (3) after 600-hours, releasing the wiredrawing,

700-back end assembly, 710-middle joint, 711-middle tube fixing hole, 712-radial through hole, 713-limit post, 714-extension tube socket, 720-set screw, 730-grip sleeve, 731-locking indicator, 732-unlocking indicator, 733-U-slot, 740-metal block, 741-core tube hole, 742-wire drawing hole, 743-wire drawing fastening screw hole, 744-cutting slot, 750-wire drawing fastening screw, 760-release sleeve, 761-first screw hole section, 762-metal block ring slot, 763-second screw hole section, 764-luer taper joint hole section, 765-bit indicator, 767-guide post hole,

780-guide post, 781-positioning post, 782-guide claw, 790-luer taper joint,

800-core tube, 900-middle tube, 901-core tube through hole, 902-wire drawing through hole.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to specific examples and comparative examples.

The proximal end refers to the end near the tip of the guide head 100, the distal end refers to the end far away from the tip of the guide head 100, and the inner refers to the side near the axis and the outer refers to the side far away from the axis.

Example 1

1-2, the front-end back release mechanism of the interventional stent conveyer comprises a front-end assembly 200, and comprises a first limiting piece 210, a movable claw 220 sleeved on the first limiting piece 210 and a second limiting piece 230, wherein claw grooves (2121, 2141) matched with claw bodies 221 of the movable claw 220 are formed in the first limiting piece 210, the proximal end of an interventional stent is fixed to the first limiting piece 210 through the cooperation of the movable claw 220 and the claw grooves (2031, 2041), the proximal end of the first limiting piece 210 is fixed to a guide head 100, the distal end of the first limiting piece is limited in the length range of the first limiting piece 210 through the axial sliding of the movable claw 220 through the second limiting piece 230, and meanwhile, the proximal end of the interventional stent can be released when the movable claw 220 moves.

As shown in fig. 3, from the proximal end to the distal end, the first limiting member 210 sequentially includes a threaded shaft 211, a front disc 212, a transition shaft 213, a rear disc 214, and a claw shaft 215, claw grooves (2031, 2041) matched with the claw body 221 are formed on the front disc 212 and the rear disc 214, and an inner hole 218 for passing the core tube 800 is formed at the axial center position of the first limiting member 210. A plurality of bracket rings inserted into the proximal end of the bracket are penetrated through the claw body 221 and then fixed at the transition shaft 213, and the length L1 of the claw body 221 is equal to the total length of the front disc 212, the transition shaft 213 and the rear disc 214; as shown in fig. 4, a distal end of the claw body 221 extends inward to form a claw head 222, a central hole 223 of the claw head 222 is sleeved on the claw shaft 215, and a total length L2 of the claw body 221 and the claw head 222 is equal to a total length of the rear disc 214 and the claw shaft 215; a wire drawing fixing hole 224 is arranged between the two claw bodies 221 of the claw head 222, the wire drawing 600 is fixed in the wire drawing fixing hole 224 in a welding mode, specifically, the diameter of the wire drawing 600 is the same as that of the wire drawing fixing hole 224 of the claw head 222, and is preferably 0.2-0.4 mm; as shown in fig. 1 (b), the proximal end of the wire drawing has a straight hook bent to 90 degrees with a length of 1-2 mm, and the straight hook is inserted into the wire drawing fixing hole 224 and welded and fixed with the claw head 222; the distal end of the claw shaft 215 is extended to be provided with a collar shaft 216, the outer surfaces of the claw shaft 215 and the collar shaft 216 are provided with a wiredrawing groove 217, and the second limiting piece 230 is sleeved on the collar shaft 216. The wire drawing 600 adjacent to the straight hook is embedded into the wire drawing groove 217 of the first limiting piece 210, the wire drawing 600 is in clearance fit with the wire drawing groove 217, and the wire drawing 600 freely slides in the wire drawing groove 217. After the wire drawing 600 passes through the wire drawing through hole 902 (see the schematic cross-sectional view of the middle tube in fig. 12 (b)) of the middle tube 900, it is fixed in the wire drawing hole 742 (see the schematic cross-sectional view of the middle tube in fig. 12 (b)) of the metal block 740 at the distal end. The second limiting member 230 is preferably a collar fixedly sleeved on the collar shaft 216, and the collar is preferably a tapered metal ring, the thickness of which is the same as the length of the collar shaft 216, and the collar 230 and the collar shaft 216 are welded together. The collar 230 retains the wire drawing 600 within the wire drawing groove 217 so that the wire drawing start 600 can be smoothly drawn and fed under the guide of the wire drawing groove 217.

The front end assembly 200 designed above is completely of a rigid metal structure, can not deform in a bent blood vessel, can not change the matching performance among parts, and can drive the movable claw 220 to easily move on the claw shaft of the first limiting member 210 when the distal end of the wire drawing 600 is drawn anytime, and the wire drawing 600 is driven. The front end assembly 200 is ensured to be smoothly opened in the abnormally bent blood vessel, so that the bare end (proximal end) of the interventional stent is smoothly released and opened.

Meanwhile, the front end assembly 200 only needs to be assembled with a single-layer core tube 800, so that the cross-sectional size of the core tube 800 can be reduced, the loading space of the stent in the sheath 300 can be increased, the outer diameter of the sheath 300 can be reduced by assembling the stent with the same specification, and the size of the conveying system is smaller. The material of the front end component 200 is preferably PEEK, 304L stainless steel or 316L stainless steel.

The front-end rear release mechanism further includes a rear end assembly 700, the rear end assembly 700 including a metal block 740 and a release sleeve 760, the metal block 740 being axially positioned within a block ring groove 762 within the release sleeve 760 and being rotatable only within the block ring groove 762; the release sleeve 760 is sleeved on the screw 500, and the positioning locking and the axial movement of the release sleeve 760 and the screw 500 are realized through a guide locking mechanism arranged on the release sleeve 760 and the screw 500. The moving claw 220 and the metal block 740 are connected through the wire drawing 600, and further, the positioning locking and the axial movement of the moving claw 220 on the first limiting member 210 can be realized by moving the positioning locking and the axial movement of the rear end release sleeve 760. Fig. 5 (a) is a schematic three-dimensional structure of the rear end assembly in a locked state, fig. 5 (b) is a schematic structure of the rear end assembly in a locked state after the screw, the release sleeve and the holding sleeve are partially cut away, fig. 5 (c) is a schematic front sectional structure of the rear end assembly in a locked state after the screw, the release sleeve and the holding sleeve are partially cut away, and fig. 5 (d) is a schematic front sectional structure of the rear end assembly in an opened state after the rear end assembly is partially cut away.

Preferably, the guide locking mechanism comprises a guide post 780 and an L-shaped guide groove 551 provided on the outer surface of the screw 500, wherein the guide post 780 comprises a positioning post 781 and at least two elastic guide claws 782 provided at one end of the positioning post 781 as shown in fig. 6; preferably, as shown in fig. 6 (a), the two elastic guide claws 782 are opened at the lower ends thereof in a free state, and have a total width D1. As shown in fig. 6 (b), after being pressed in operation, the lower ends of the two guide claws are gathered together, and the total width is D2, D1> D2. The guide post 780 is cylindrical-fitted in the guide post hole 767 shown in fig. 7 perpendicular to the release sleeve 760, and two elastic guide claws 782 on the guide post 780 are inserted into L-shaped guide grooves 551 on the release sleeve shaft 550 of the screw 500. The opening direction of the elastic guide claw 782 is parallel to the axial direction of the release sleeve 760.

Fig. 7 (a) is a schematic view of a front view of the screw; FIG. 7 (b) is a schematic view of the structure of the screw in section C-C; fig. 7 (c) is a schematic view of the structure of the screw rod which is rotated counterclockwise (seen from the distal end) to expose the L-shaped guide groove, and fig. 7 (d) is a schematic view of the cross-sectional structure of the screw rod A-A. The short arm 5512 of the L-shaped guide groove 551 is provided with a guide groove fixing hole 5513. Specifically, as shown in the schematic diagram of the matching structure of the guide post and the long arm 5511 of the L-shaped guide groove in fig. 8 (a), the long arm 5511 of the L-shaped guide groove 551 is an elastic guide claw release section, and is axially disposed along the screw 500, and is in clearance fit with the elastic guide claw 782, so that the elastic guide claw 782 is in a free state here, and the release sleeve 760 can easily move along the axial direction along with the guide post 780.

The short arm 5512 of the L-shaped guide groove 551 is an elastic guide claw locking section, and is disposed along the circumferential direction of the screw 500 and is in interference fit with the elastic guide claw 782, so that the elastic guide claw 782 is in a pressed state; specifically, referring to fig. 8 (b) which shows a schematic structure of the cooperation between the guide post and the short arm 5512, the total width of the elastic guide claw 782 is reduced from D1 to D2, and the release sleeve 760 is rotated counterclockwise (from the distal end to the proximal end) by force, so that the elastic guide claw 782 can reach the guide slot fixing hole 5513 through the short arm 5512.

The guide slot securing holes 5513 preferably achieve a clearance fit with the resilient guide pawls 782; specifically, referring to the schematic diagram of the cooperation structure between the guide post and the guide slot fixing hole 5513 in fig. 8 (c), when the elastic guide claws 782 are located in the guide slot fixing hole 5513, the two elastic guide claws 782 are elastically opened to form a width D1 by themselves, so that 780 is fixed at the position of the guide slot fixing hole 5513, and cannot automatically enter the long support arm 5511 through the short support arm 5512. This provides for safe locking of the release sleeve 760 and ease of operation so that the front and rear release mechanisms do not open unexpectedly.

Preferably, the slot of the L-shaped guiding slot 551 is trapezoidal, and the slot bottom width of the elastic guiding pawl releasing section is equal to the aperture of the guiding slot fixing hole 5513 and is greater than the slot bottom width of the elastic guiding pawl locking section. The length of the long arm 5511 is preferably greater than the total length of the front plate 212 and the transition shaft 213.

Preferably, the upper and lower ends of the metal block 740 are positioning cambered surfaces, in particular, a front view of the metal block 740 shown in fig. 9 (a) and an end view of the proximal end of the metal block 740 shown in fig. 9 (b), where the positioning cambered surfaces are in clearance fit with the inner cylindrical surface of the metal block ring groove 762; allowing the metal block 740 to freely rotate within the block ring groove 762. The metal block 740 includes a cutting groove 744 extending from top to bottom through its axis (the cutting groove 744 is perpendicular to the end face of the release sleeve 760), the cutting groove 744 dividing the metal block 740 into two halves connected only at the lower end; the wire drawing 600 is fixed in the wire drawing hole 742 in the cutting groove 744, and the wire drawing hole 742 is tightly fitted with the wire drawing 600. The metal block 740 is preferably formed by processing a stainless steel material such as SUS304, SUS304L, SUS or SUS 316L.

Preferably, the back end assembly 700 further includes a grip sleeve 730 that is sleeved and fixed to the outer surface of the screw 500, and the grip sleeve 730 is preferably a cylindrical collar as shown in fig. 10. A locking indicator 731 and an unlocking indicator 732 are arranged at the distal end of the outer surface of the holding sleeve 730, and a bit 765 for indicating the rotation position of the release sleeve is arranged at the proximal end of the outer surface of the corresponding release sleeve 760; the angle between the locking indicator 731 and the unlocking indicator 732 is related to the circumferential length of the short leg 5512 of the L-shaped guide groove 551, preferably an acute angle, more preferably 40 °. The grip 730 is preferably made of ABS, PE, PVC or the like. The extension socket 714 of the middle tube joint 710, which is exposed out of the screw 500, is inserted into the U-shaped groove 733 of the grip sleeve 730 to be positioned.

Preferably, fig. 11 (a) is a three-dimensional schematic structural view of the release sleeve 760, fig. 11 (b) is a schematic sectional front view of the release sleeve 760, and the release sleeve 760 is a cylindrical sleeve, and the inner bore of the cylindrical sleeve sequentially comprises a first screw hole section 761, a metal block ring groove 762, a second screw hole section 763 and a luer taper joint hole section 764 from the proximal end to the distal end; the first 761 and second 763 screw bore sections are clearance fit over the release sleeve shaft 550 of the screw 500 such that the release sleeve 760 is slidable over the release sleeve shaft 550 of the screw 500. The inner diameter of the metal block ring groove 762 is larger than the inner diameters of the first screw hole section 761 and the second screw hole section 763, and can be used for limiting the metal block 740, so that the metal block 740 can only relatively move in the metal block ring groove 762 and cannot axially move relative to the release sleeve 760.

The distal end of the screw 500 is fixedly connected with the luer taper joint 790 through the luer taper threaded shaft 560, and the luer taper joint hole section 764 is in clearance fit and sleeved on the outer side of the luer taper joint 790 for accommodating the luer taper joint 790. The distal end of the core tube 800 is secured to the luer taper fitting 790 and the proximal end is secured to the guide head 100. The release sleeve 760 is preferably made of a plastic such as ABS, PE, PVC.

Preferably, the rear end assembly 700 further includes a middle pipe joint 710 fixed in the screw 500, as shown in fig. 12 (a), a middle pipe fixing hole 711 for receiving and fixing the middle pipe 900 is provided in the middle pipe joint 710, the core pipe 800 is inserted into the core pipe through hole 901 of the middle pipe 900, and the middle pipe 900 further includes a drawing through hole 902 disposed in parallel with the core pipe through hole 901. Referring to fig. 9, corresponding to the core tube through hole 901 and the wire drawing through hole 902, a core tube hole 741 and the wire drawing hole 742 are provided at the axial position of the metal block 740; the two halves of the metal block 740 are provided with a wire drawing fastening screw hole 743 for screwing the wire drawing fastening screw 750, the wire drawing fastening screw hole 743 is perpendicular to the cutting groove 744, the wire drawing fastening screw hole 743 on the half of the metal block 740 is a counter bore, the wire drawing fastening screw hole 743 on the other half of the metal block 740 is a screw hole, and the wire drawing fastening screw 750 is screwed to clamp the wire drawing 600 by the wire drawing hole 742.

The outer side surface of the middle pipe joint 710 is symmetrically provided with limiting columns 713 along the radial extension, and the limiting columns 713 are provided with radial through holes 712; the radial through hole 712 is a threaded hole with an axis perpendicular to the middle pipe joint 710, and the set screw 720 is screwed into the radial through hole 712 to lock the middle pipe 900; the screw 500 is further provided therein with a middle pipe joint limiting hole 541 for fixing the limiting column 713. The center pipe joint 710, the center pipe 900 and the screw 500 are fixed together by fixing the stopper posts 713 into the center pipe joint stopper holes 541.

Example 2

A handle capable of realizing quick and slow release of an intervention support, as shown in fig. 13, comprises a handle housing 410 and a screw sleeve 420 fixed in the handle housing 410, wherein one end (the proximal end in fig. 13) of the handle housing 410 is provided with an axial extension part of the screw sleeve 420, and the axial extension part is provided with a cam ring quick and slow switching mechanism 430. Wherein FIG. 13 (a) is a schematic view of the handle structure of the present invention; FIG. 13 (b) is a schematic cross-sectional view of the handle of the present invention in a rotated, slowly moving state; FIG. 13 (c) is a schematic cross-sectional view of the handle of the present invention in a sliding, quick-travel condition;

the cam ring speed switching mechanism 430 includes a cam ring 431 and a telescopic tooth plate 432. The cam ring 431 is journaled to the screw sleeve 420 with a clearance fit therebetween. Along the radial direction of the cam ring 431, the telescopic tooth plate 432 extends inward with the tooth 4321. The teeth 4321 are preferably internal trapezoidal threads that mate with trapezoidal threads of the screw.

The outer surface of the telescopic tooth plate 432 is in contact connection with the concave-convex inner surface of the cam ring 431; the tooth 4321 is located in the radial through hole 4221 of the screw sleeve 420, and can extend out of the radial through hole 4221 to be engaged with threads on the screw 500 disposed in the screw sleeve 420, so as to realize sliding fast movement and rotating slow movement of the screw sleeve 420 along the screw 500.

The screw 500 of the transporter is provided with a sheath 300 therein, the screw 500 is provided with a sheath guide groove 531, and a guide plate 4413 of the sheath moving device 440 fixedly connected to the distal end of the sheath 300 passes through the sheath guide groove 531 to connect the sheath 300 to the handle housing 410 and the screw cover 420. The guide plate 4413 is in clearance fit with the sheath tube joint guide groove 531.

The cam ring speed switching mechanism 430 cooperates with the screw 500 of the conveyor such that the concave-convex inner surface of the cam ring 431 presses down the tooth 4321 to protrude from the inside of the radial through hole 4221 and is engaged with the threads on the screw 500. By rotating the handle housing 410, the screw sleeve 420 rotates to drive the sheath tube moving device 440 connected with the screw sleeve to move slowly along the screw 500, so as to realize slow release of the intervention stent.

After the slow release process of the intervention support is completed, the cam ring 431 is rotated by a small amplitude (for example, 50 degrees), so that the concave-convex inner surface of the cam ring 431 rebounds the tooth 4321 into the radial through hole 4221 and is separated from the thread on the screw rod 500, and then the handle shell 410 is directly pulled to the distal end rapidly, and the screw rod sleeve 420, the sheath moving device 440 and the sheath 300 slide along the sheath pipe joint guide groove 531 of the screw rod 500 to the distal end rapidly.

Since the concave-convex inner surface of the cam ring 431 has a limiting function on the outer surface of the telescopic tooth plate 432, as shown in fig. 14 (a), an end surface structure of one embodiment of the cam ring is shown in the design, a smooth transition surface between two limiting positions of the concave-convex inner surface of the cam ring 431 can be designed, and an operator can apply a certain torque to rotate the cam ring 431. Both sides of the concave-convex inner surface of the cam ring 431 are designed as vertical groove surfaces so that the operator cannot rotate the cam ring 431 out of the range no matter how much torque is applied. Therefore, when the operator operates, the operator does not need to visually confirm the position of the handle, and the operator can directly realize the fast and slow switching by trying to rotate, so that the operator can not interfere with the observation of the image screen.

Preferably, the cam ring speed switching mechanism 430 includes two pairs of telescopic lugs 432 symmetrically distributed on both sides of the screw. The radial through holes 4221 of the corresponding screw sleeve 420 are also symmetrically designed to be two, so that the rotary slow movement is smoother and smoother.

Unlike the above-described examples, a schematic structural view of another embodiment of the cam ring is shown in fig. 14 (b-d), in which fig. 14 (b) is a schematic structural view of the end face of the cam ring; FIG. 14 (c) is a schematic three-dimensional structure of the cam ring; FIG. 14 (d) is a schematic cross-sectional view of the cam ring; the inner hole of the cam ring 431 is symmetrically distributed with a pair of shallow arc grooves 4311 and a pair of deep arc grooves 4312 along the circumferential center, so as to form the concave-convex inner surface. The radial groove depth of the shallow arc groove 4311 is R1, the radial groove depth of the deep arc groove 4312 is R2, and the difference between the radial groove depths of the shallow arc groove 4311 and the deep arc groove 4312 is not less than the height of the tooth 4321, namely, R2-R1 is not less than the height of the tooth 4321. Preferably R2-r1=the height of the tooth 4321.

Preferably, the shallow arc grooves 4311 and the deep arc grooves 4312 extend in the axial direction at an angle of 50 °, i.e., an angle by which the cam ring 431 can rotate is 50 °.

Preferably, the cam ring 431 is a cylindrical ring, and a plurality of protrusions are uniformly distributed on the outer cylindrical surface of the cam ring 431, so that the thumb can conveniently stir the cam ring 431 to rotate; and a triangular position mark 4313 corresponding to the shallow arc groove 4311 is arranged on the outer cylindrical surface and used for indicating the position of the cam ring 431 after rotation, and a fast moving mark F and a slow rotating moving mark S are arranged on the corresponding handle shell 410. The angle between the fast moving flag F and the slow rotating flag S is also 50 °.

The inner cylindrical surface of the cam ring 431 is divided into a guide section 431A and a cam section 431B, the guide section is a complete inner cylindrical surface, and the guide section is in clearance fit with the cam column on the screw sleeve 420; the centers of the shallow arc-shaped groove 4311 and the deep arc-shaped groove 4312 are symmetrically distributed on the cam section, and a smooth transition surface between the shallow arc-shaped groove 4311 and the deep arc-shaped groove 4312 is directly a cylindrical surface with the same diameter as the guide section.

Preferably, a stopper 433 is extended axially at a side of the guide hole of the cam ring 431 for further limiting a position range of rotation of the cam ring 431; an arc-shaped limiting groove 4231 is arranged on the end face of the positioning shoulder 423 of the corresponding screw sleeve 420; the stopper 433 slides in the arc-shaped limiting groove 4231 along with the rotation of the cam ring 431, and two limit positions (4321 a,4321 b) of the stopper 433 sliding in the arc-shaped limiting groove 4231 are respectively positioned at the bottom of the shallow arc-shaped groove 4311 and at the bottom of the deep arc-shaped groove 4312 corresponding to the outer surfaces of the telescopic tooth plates 432. That is, the included angle between the two extreme positions of the arc-shaped limiting groove 4231 is 50 °.

Preferably, as shown in fig. 15, the screw sleeve 420 includes, in order, a first shaft section 421, a second shaft section 422, a positioning shoulder 423, and a third shaft section 424; the outer diameters of the first shaft section 421, the second shaft section 422 and the positioning shoulder 423 rise in order; the cam ring 431 is in clearance fit with the second shaft section 422, and the cam ring 431 is arranged between the positioning shoulder 423 and the clamping ring 450 and realizes axial positioning through the positioning shoulder 423 and the clamping ring 450; the snap ring 450 is secured to the first shaft section 421 and the handle housing 410 is secured to the third shaft section 424.

Preferably, the retractable dental plate 432 includes a dental plate 4322 and a reed 4323, as shown in fig. 16 (a) which is a three-dimensional schematic view of the dental plate; a reed hole 43221 is arranged at the center of the dental plate 4322; fig. 16 (b) shows a three-dimensional structure schematic diagram of a reed 4323, fig. 16 (c) shows a three-dimensional structure schematic diagram of a telescopic dental plate 432, the reed 4323 is an arcuate spring piece penetrating into a reed hole 43221, a supporting leg 4323A of the reed 4323 faces inwards, and an arcuate top of the reed 4323 abuts against a top of the reed hole 43221; a reed groove 4222 is arranged on the corresponding screw sleeve 420 in a crisscross manner with the radial through hole 4221; the reed grooves 4222 are preferably blind grooves, and the legs 43231 of the reed 4323 are pressed into the reed grooves 4222 by the tooth plate 4322 and the cam ring 431. The outer surface of the retractable dental plate 432 is an arc-shaped top surface 4322A of the dental plate 4322, and the arc of the arc-shaped top surface is smaller than the arc of the deep arc-shaped groove 4312.

Preferably, the tooth plate 4322 and the cam ring 431 are made of PEEK material and/or POM material with good self-lubricating property, and the reed 4323 is made of 0Cr17Ni7Al stainless steel or TINI memory alloy with good elasticity. The materials of the rest parts of the handle comprise ABS, PE, PVC and other plastic materials.

Preferably, the handle for realizing quick and slow release of the intervention support further comprises an arc-shaped clamping sleeve 460, particularly shown in fig. 17, wherein fig. 17 (a) is a three-dimensional structure schematic diagram of the arc-shaped clamping sleeve; FIG. 17 (b) is a schematic cross-sectional view of an arcuate ferrule and a partially enlarged view; the arc-shaped cutting sleeve 460 is an arc-shaped sleeve with a small proximal end and a large distal end. The arc-shaped cutting sleeve 460 comprises a sheath sleeve positioning hole section 461, a screw positioning hole section 462 and a button hole section 463 with the inner diameter sequentially increased, and two buttons 464 are symmetrically arranged on the button hole section 463; one end of the button 464 is connected with the wall of the screw positioning hole 462, the other end extends to the edge of the button hole 463 in the axial direction, a hook 465 is further extended, and the hook 465 is clamped in the G-shaped groove 451 of the clamp ring 450. The height of the hook 465 is H1 and the length of the hook is W1.

Preferably, as shown in fig. 18, the inner hole of the snap ring 450 is a positioning hole 452, and is in interference fit with the first shaft section 421 of the screw sleeve 420. Wherein, fig. 18 (a) is a three-dimensional structure schematic diagram of an arc-shaped snap ring; fig. 18 (b) is a schematic cross-sectional structure of the present arc-shaped snap ring. The height of the opening of the G-shaped groove is H2, and the width of the inside of the clamping groove is W2. Wherein H2> H1, W2> W1. As shown in fig. 19, fig. 19 (a) is a schematic diagram showing a locked state of the hook 465 and the snap ring 450 when the button 464 is not stressed. Fig. 19 (b) is a schematic diagram showing the state that the hook 465 is unlocked from the clasp 450 when the button 464 is pressed. Fig. 19 (c) is a schematic view showing a state in which the hook 465 is disengaged from the snap ring 450 when the button 464 is not stressed.

The button 464 and the clamping hook 465 of the arc-shaped clamping sleeve 460 enable the arc-shaped clamping sleeve 460 to be locked with the handle shell 410 through the clamping ring 450, so that the locking function of the handle is realized, no matter the cam ring 431 rotates to a quick release state or a slow release state, no matter the cam ring 431 rotates or the handle shell 410 is pulled back, the arc-shaped clamping sleeve 460 and the clamping ring 450 cannot be separated, vibration in the transportation process and mistaken touch to the handle in the use process are guaranteed, the support film covering section cannot be released in advance, and the use safety of products is guaranteed.

Preferably, the proximal outer diameter of the handle housing 410, the outer diameter of the locating shoulder 423, the distal outer diameter of the cam ring 431, the proximal outer diameter of the cam ring 431, the outer diameter of the snap ring 450, and the distal outer diameter of the arcuate collar 460 are all equal, so that the overall handle appearance is round and attractive, and easy to grasp.

Preferably, the sheath moving device 440 includes a sheath connector 441, and the sheath connector 441 is divided into a sheath connecting section 4411 and a transition section 4412 as shown in a front view of a handle sheath connector in fig. 20 (b); the distal end of the sheath 300 is fixedly connected to the sheath connecting section 4411 through the sheath locking nut 442; the outer peripheral surface of the far end of the transition section 4412 is provided with a guide plate 4413, and the inner hole of the far end of the transition section 4412 is provided with a sealing hole 4414; the end face structure of the sheath tube joint of the guide plate 4413 is shown in fig. 20 (a), which is a near-T-shaped guide plate, the vertical section of the guide plate 4413 passes through the sheath tube joint guide groove 531 of the screw 500 and moves in the sheath tube joint guide groove 531 to drive the sheath tube 300 to move axially; the horizontal section of the guide plate 4413 is clamped between the screw sleeve 420 and the handle shell; the transition section 4412 is provided with a middle pipe through hole in the axial direction for accommodating the middle pipe 900; the end of the middle tube through hole is sealed and fixed on the sheath tube joint 441 through a sealing ring 480 and a sealing screw sleeve 490.

When the handle is specifically used, the handle is in an initial state: the arc-shaped clamping sleeve 460 is buckled with the clamping ring 450, the triangular position mark 4313 on the cam ring 431 points to the S of the handle shell 410, at this time, the limiting block 433 on the cam ring 431 is positioned at the left end of the arc-shaped limiting groove 4231 of the screw sleeve 420, the top arcs of the two dental plates 4322 are positioned in the shallow arc-shaped groove 4311 of the cam ring 431, the dental plates 4322 are pressed down by the shallow arc-shaped groove 4311 and move down along the radial through hole 4221 on the screw sleeve 420, the reed 4323 supported in the reed groove 4222 is pressed down by the dental plates 4322 to be flattened, and the dental bodies 4321 are meshed with the trapezoidal threads on the screw 500.

After the intervention support is sent to the designated position, two buttons 464 on the arc-shaped clamping sleeve 460 are pressed down, the two clamping hooks 465 are separated from the clamping ring 450 to unlock, at the moment, the handle shell 410 is rotated, the dental plate 4322 can do spiral motion in the trapezoidal threads of the screw 500, and the dental plate 4322 can drive the screw sleeve 420, the handle shell 410, the sheath pipe joint 441 and the sheath pipe 300 to slowly move along the axial direction of the screw 500, so that the slow release of the intervention support is realized.

When the intervention stent is slowly released in place, it is necessary to switch to quick release and toggle cam ring 431 clockwise (as viewed from the proximal end to the distal end) to rotate cam ring 431 50 degrees, the triangular index 4313 of cam ring 431 pointing to the quick movement flag F. At this time, the limiting block 433 of the cam ring 431 is located at the right end of the arc limiting groove 4231 of the screw sleeve 420, the two tooth plates 4322 rotate to the deep arc groove 4312 of the cam ring 431, and the two pressed reeds 4323 jack the two tooth plates 4322 until the top arc of the tooth plates 4322 is tangent to the arc top of the deep arc groove 4312; at this time, the dental plate 4322 is disengaged from the screw 500, and the handle housing 410 is quickly retracted along the screw 500, so that the screw sleeve 420, the sheath connector 441 and the sheath 300 can be driven to axially and quickly move along the screw 500, thereby realizing quick release of the intervention stent.

According to the handle for realizing the rapid release of the intervention support, the rapid switching of the rapid release state can be realized by touching the bulges on the periphery of the cam ring 431 with the thumb and then poking the cam ring 431, and no visual observation is needed during operation. In any release state, the reed 4323 always pushes the dental plate 4322 to the deep arc groove 4312 or the shallow arc groove 4311 of the cam ring 431, so that the dental plate 4322 does not automatically compress the reed 4323 from one arc section to the other arc section, the cam ring 431 is manually stirred, and the handle is not automatically switched between quick and slow release states, so that the whole handle is safe and reliable to use.

After the intervention support is released, the cam ring 431 is ensured to be in a quick release position, the arc-shaped clamping sleeve 460 is retracted, when the inclined surface of the clamping hook is contacted with the clamping ring, the clamping hook is extruded and bent downwards by the clamping ring until the clamping hook 465 slides into the G-shaped groove 451 of the clamping ring 450 to be hooked and locked again with the clamping ring 450. At this time, no matter which part of the handle is held by the hand during the back-out conveying system, no matter the back-out is carried out by the straight pulling or the rotating back-out, the guide head and the back-out mechanism are not led to be separated from the sheath 300, and further, the size mutation and the difficult operation when the sheath, the back-out mechanism and the guide head are withdrawn from the femoral incision in sequence are avoided.

Example 3

An interventional stent delivery device comprising the front-end rear release mechanism of embodiment 1, as shown in fig. 21, further comprising:

the distal end of the guide head 100 is fixed on the threaded shaft 211 of the first limiting member 210 of the front-end rear release mechanism;

the distal end of the screw 500 is provided with the holding sleeve shaft 540, the release sleeve shaft 550 and the luer taper threaded shaft 560 in sequence;

sheath 300, the proximal end is slidably sleeved on the guide head 100, and the distal end is slidably connected to the screw 500 through a sheath connector 441;

a core tube 800 having one end fixed to the guide head 100 and the other end fixed to a luer taper 790;

a middle tube 900, the proximal end of which extends at least beyond the proximal end of the screw 500, and the distal end of which is fixed to the screw 500 by a middle tube joint; the axis is provided with a core tube through hole 901 for penetrating the core tube 800, and the outer side of the core tube through hole 901 is provided with a wire drawing through hole 902 for penetrating the wire drawing 600.

The using method of the intervention stent conveyor comprises the following steps:

s501, the stent ring of the interventional stent, which is only left at the proximal end, is fixed by the moving jaw 220 and jaw grooves (2031, 2041) to the transition shaft 213 of the first stop 210; see in particular the schematic view of the mating structure of the intervention stent fully pushed out of the sheath 300 of fig. 22 (b). At this time, the release sleeve 760 is attached to the holding sleeve 730, the position indicator 765 of the release sleeve 760 points to the locking indicator 731 of the holding sleeve 730, the guide claw 782 of the guide post 780 is located in the guide slot fixing hole 5513 of the screw 500, and at this time, the distance between the metal block 740 and the moving claw 220 is just equal to the length of the post-release wire drawing 600;

S502, holding the holding sleeve 730 by a left hand, holding the releasing sleeve 760 by a right hand, rotating the releasing sleeve 760 to enable the position indicator 765 to rotate from the locking indicator 731 to the unlocking indicator 732 of the holding sleeve 730, and at this time, the guide claw 782 of the guide post 780 rotates from the guide slot fixing hole 5513 to the proximal end of the long support arm 5511 through the short support arm 5512; because the metal block 740 is in clearance fit with the metal block ring groove 762 of the release sleeve 760, the metal block 740 does not rotate the wire drawing 600.

S503, withdrawing the release sleeve 760, wherein the guide claw 782 of the guide post 780 slides from the proximal end to the distal end of the long support arm 5511, and simultaneously, drives the metal block 740, the wire drawing 600 and the moving claw 220 to withdraw until the claw head 222 of the moving claw 220 moves to the proximal end of the second limiting member 230 to be limited; since the total length of the pawl 221 and the pawl head 222 is equal to the total length of the rear disc 214 and the pawl shaft 215, the pawl 221 is completely separated from the transition shaft 213, and then the bracket ring clamped to the transition shaft 213 is released, so as to complete the front-end back-release process of the intervention bracket, specifically, see the schematic diagram of the completely released cooperation structure of the intervention bracket in fig. 22 (c).

Example 4

Unlike the above-described embodiments, the interventional stent transporter of the present embodiment, including the guide head 100, the sheath 300, the screw 500, and the handle 400 of embodiment 2, can achieve rapid and slow release of an interventional stent.

The interventional stent conveyor of the embodiment is used as follows:

s301, in the slow release process, the intervention support is sent to a designated position to enable the intervention support to be in a completely tightened state, at the moment, see a matched structure schematic diagram of the intervention support in which the intervention support is constrained by the sheath 300 in FIG. 22 (a), then two buttons 464 on an arc-shaped clamping sleeve 460 are pressed down, two clamping hooks 465 are separated from the clamping ring 450 to unlock, at the moment, the handle shell 410 is rotated, a dental plate 4322 can do spiral motion in trapezoidal threads of the screw 500, and the dental plate 4322 can drive the screw sleeve 420, the handle shell 410, the sheath connector 441 and the sheath 300 to slowly move along the axial direction of the screw 500, so that slow release of the intervention support is realized and completed;

s401, in the quick release process, the cam ring 431 is shifted, so that the cam ring 431 rotates until the triangular position mark 4313 points to the quick movement mark F; at this time, the limiting block 433 of the cam ring 431 is located at the right end of the arc limiting groove 4231 of the screw sleeve 420, the two tooth plates 4322 rotate to the deep arc groove 4312 of the cam ring 431, and the two pressed reeds 4323 jack the two tooth plates 4322 until the top arc of the tooth plates 4322 is tangent to the arc top of the deep arc groove 4312; at this time, the dental plate 4322 is disengaged from the screw 500, and the handle housing 410 is quickly retracted along the screw 500, so that the screw sleeve 420, the sheath connector 441 and the sheath 300 can be driven to axially and quickly move along the screw 500, thereby realizing and completing the quick release of the interventional stent. After the quick release, the interventional stent is pushed completely out of the sheath 300 as shown in fig. 22 (b).

Example 5

Unlike the above-described embodiments, the interventional stent delivery device of the present embodiment includes a guide head 100, a sheath 300, a screw 500, the front-end rear release mechanism in embodiment 1, and the handle 400 described in embodiment 2.

The application method of the interventional stent conveyor in the embodiment comprises the following steps:

s1, in an initial state, a bracket ring at the proximal end of an intervening bracket is fixed to a transition shaft 213 of the first limiting member 210 by the movable claw 220 and claw grooves (2031, 2041) and is integrally folded and arranged in the sheath 300, the proximal end of the sheath 300 is sleeved on the guide head 100, and the movable claw 220 is completely clamped in the claw groove 2031;

the hook 465 of the arc-shaped clamping sleeve 460 is hooked and locked with the G-shaped groove 451 of the clamping ring 450 (see fig. 19 a), the triangular position mark 4313 on the cam ring 431 points to the slow rotation moving mark S on the handle shell 410, the limiting block 433 on the cam ring 431 is positioned at the left end of the arc-shaped limiting groove 4231 of the screw sleeve 420, the top arcs of the two tooth plates 4322 are positioned in the shallow arc-shaped groove 4311 of the cam ring 431, the tooth plates 4322 are pressed down by the shallow arc-shaped groove 4311 and move down along the radial through hole 4221 on the screw sleeve 420, the reed 4323 supported in the reed groove 4222 is pressed down by the tooth plates 4322, and the tooth body 4321 is meshed with the trapezoid threads on the screw 500;

The release sleeve 760 is attached to the holding sleeve 730, the position mark 765 of the release sleeve 760 points to the locking indicator 731 of the holding sleeve 730, the guide claw 782 of the guide post 780 is located in the guide groove fixing hole 5513 of the screw 500, and at this time, the distance between the metal block 740 and the moving claw 220 is just equal to the length of the rear release wire drawing 600;

s2, sending the intervention stent to a designated position;

s3, in the slow release process, two buttons 464 on the arc-shaped clamping sleeve 460 are pressed down, then the two clamping hooks 465 are separated from the clamping ring 450 to unlock, at the moment, the handle shell 410 is rotated, the dental plate 4322 can do spiral motion in the trapezoidal threads of the screw 500, and the dental plate 4322 can drive the screw sleeve 420, the handle shell 410, the sheath pipe joint 441 and the sheath pipe 300 to slowly move along the axial direction of the screw 500, so that the slow release of the intervention support is realized and completed;

s4, in the quick release process, the cam ring 431 is shifted, so that the cam ring 431 rotates until the triangular position mark 4313 points to the quick movement mark F; at this time, the limiting block 433 of the cam ring 431 is located at the right end of the arc limiting groove 4231 of the screw sleeve 420, the two tooth plates 4322 rotate to the deep arc groove 4312 of the cam ring 431, and the two pressed reeds 4323 jack the two tooth plates 4322 until the top arc of the tooth plates 4322 is tangent to the arc top of the deep arc groove 4312; at this time, the dental plate 4322 is disengaged from the screw 500, and the handle housing 410 is quickly retracted along the screw 500, so that the screw sleeve 420, the sheath tube connector 441 and the sheath tube 300 can be driven to axially and quickly move along the screw 500, thereby realizing and completing the quick release of the interventional stent;

S5, in the front end and rear release process, after the rapid release of the intervention stent, only the stent ring at the left proximal end of the intervention stent is fixed to the transition shaft 213 of the first limiting member 210 by the movable claw 220 and the claw grooves (2031, 2041); rotating the release sleeve 760 to rotate the position indicator 765 from the locking indicator 731 to the unlocking indicator 732 of the grip sleeve 730, and simultaneously, rotating the guide claw 782 of the guide post 780 from the guide slot fixing hole 5513 to the proximal end of the long arm 5511 via the short arm 5512; because the metal block 740 is in clearance fit with the metal block ring groove 762 of the release sleeve 760, the metal block 740 does not drive the wire drawing 600 to rotate; then, the release sleeve 760 is retracted, the guide claw 782 of the guide post 780 slides from the proximal end to the distal end of the long support arm 5511, and simultaneously, the metal block 740, the wire drawing 600 and the moving claw 220 are driven to be retracted until the claw head 222 of the moving claw 220 moves to the proximal end of the second limiting member 230 and is further limited; since the total length of the pawl 221 and the pawl head 222 is equal to the total length of the rear disc 214 and the pawl shaft 215, the pawl 221 is completely separated from the transition shaft 213, so as to release the bracket ring clamped on the transition shaft 213, and complete the front-end rear-release process of the intervention bracket;

S6, in the locking stage of the guide head 100, the cam ring 431 is determined to be in a quick release position, the arc-shaped clamping sleeve 460 is retracted, when the clamping hook inclined surface is in contact with the clamping ring, the clamping hook is extruded and bent downwards by the clamping ring until the clamping hook 465 slides into the G-shaped groove 451 of the clamping ring 450 to be hooked and locked again with the clamping ring 450, and at the moment, the distal end of the guide head 100 returns to the sheath 300 and is locked.

And S7, withdrawing the whole conveyor.

It should be noted that the above-described embodiments provide a more complete understanding of the present invention to those skilled in the art, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that the present invention may be modified or equivalent, and in all cases, all modifications and changes may be made without departing from the spirit and scope of the present invention, which is intended to be covered by the scope of the present invention.

Claims

1. A front-end and rear-end release mechanism of an interventional stent conveyor, which is characterized by comprising

2. The front-end rear release mechanism of an interventional stent conveyor according to claim 1, wherein the guide locking mechanism comprises a guide post and an L-shaped guide groove arranged on the outer surface of the screw, the guide post comprises a positioning post and at least two elastic guide claws arranged at one end of the positioning post; the long support arm of the L-shaped guide groove is axially arranged along the screw rod and is in clearance fit with the elastic guide claw; the short support arm of the L-shaped guide groove is arranged along the circumferential direction of the screw rod and is in interference fit with the elastic guide claw; the short support arm is provided with a guide groove fixing hole in an extending mode, and the guide groove fixing hole is in clearance fit with the elastic guide claw.

3. The front-end and rear-end release mechanism of an interventional stent conveyor according to claim 2, wherein the upper end and the lower end of the metal block are positioning cambered surfaces which are in clearance fit with the inner cylindrical surface of the ring groove of the metal block; the metal block comprises a cutting groove extending from top to bottom through the axis of the cutting groove, and the cutting groove divides the metal block into two half parts which are connected at the lower end only; the wire drawing is fixed in a wire drawing hole in the cutting groove.

4. The front-end and rear-release mechanism of an interventional stent conveyor according to claim 3, wherein the rear-end assembly further comprises a holding sleeve sleeved and fixed on the outer surface of the screw, a locking indicator and an unlocking indicator are arranged on the outer surface of the distal end of the holding sleeve, and a position indicator for indicating the rotation position of the release sleeve is arranged on the outer surface of the proximal end of the corresponding release sleeve; the included angle between the locking indicator and the unlocking indicator is related to the circumferential length of the short support arm.

5. The front-end and rear release mechanism of the interventional stent delivery device of claim 4, wherein the inner bore of the release sleeve comprises, in order from the proximal end to the distal end, a first screw bore section, a metal block ring groove, a second screw Kong Duanhe luer taper connector bore section; the first screw hole section and the second screw hole section are in sliding sleeve connection with a release sleeve shaft of the screw; the distal end of the screw rod is fixedly connected with the luer taper joint through a luer taper threaded shaft, and the luer taper joint hole section is in sliding sleeve joint with the outer side of the luer taper joint.

6. The front-end rear release mechanism of the intervention stent conveyer according to claim 3, wherein the rear end assembly further comprises a middle pipe joint fixed in the screw, a middle pipe fixing hole for accommodating and fixing a middle pipe is arranged in the middle pipe joint, a core pipe is arranged in a core pipe through hole of the middle pipe in a penetrating way, and a wire drawing through hole which is arranged in parallel with the core pipe through hole is further arranged in the middle pipe; the axis positions of the metal blocks are provided with core tube holes and wire drawing holes corresponding to the core tube through holes and the wire drawing through holes; the two halves of the metal block are provided with wire drawing fastening screw holes for screwing the wire drawing fastening screws.

7. The front-end and rear-release mechanism of an interventional stent conveyor according to claim 6, wherein the outer side surface of the middle pipe joint is symmetrically provided with limiting columns along radial extension, and the limiting columns are provided with radial through holes; the radial through hole is a threaded hole with the axis perpendicular to the middle pipe joint, and the set screw is screwed into the radial through hole to lock the middle pipe; and a middle pipe joint limiting hole for fixing the limiting column is also formed in the screw.

8. The front-end and rear-release mechanism of the interventional stent conveyor according to claim 2, wherein the first limiting piece comprises a threaded shaft, a front disc, a transition shaft, a rear disc and a claw shaft in sequence from the proximal end to the distal end, claw grooves matched with the claws are formed in the front disc and the rear disc, and the length of the claw body is equal to the total length of the front disc, the transition shaft and the rear disc; the far end of the claw body is internally provided with a claw head in an extending way, a central hole of the claw head is sleeved on the claw shaft, and the total length of the claw body and the claw head is equal to the total length of the rear disc and the claw shaft; a wire drawing fixing hole is formed between the two claw bodies of the claw head; the claw shaft is provided with a sleeve ring shaft in an extending mode at the far end, wire drawing grooves are formed in the outer surfaces of the claw shaft and the sleeve ring shaft, and the second limiting piece is sleeved on the sleeve ring shaft.

9. The front-end posterior release mechanism of an interventional stent delivery device of claim 8, wherein the length of the long arms is greater than the total length of the front tray and transition shaft.

10. An interventional stent delivery device comprising the front end rear release mechanism of any one of claims 1-9, further comprising:

11. The interventional stent delivery device of claim 10, further comprising a handle capable of effecting quick and slow release, the handle comprising a handle housing and a screw sleeve within the handle housing, one end of the handle housing having an axial extension of the screw sleeve, the axial extension having a cam ring quick and slow switching mechanism disposed thereon; the cam ring speed switching mechanism comprises a cam ring and a telescopic tooth plate; the telescopic tooth plate extends inward along the radial direction of the cam ring and is provided with a tooth body; the outer surface of the telescopic tooth plate is in contact connection with the concave-convex inner surface of the cam ring; the tooth bodies are positioned in the radial through holes of the screw rod sleeve and can extend out of the radial through holes to be in meshed connection with threads on the screw rod arranged in the screw rod sleeve so as to realize sliding type rapid movement and rotating type slow movement of the screw rod sleeve along the screw rod; the inner hole of the cam ring is symmetrically distributed with a pair of shallow arc grooves and a pair of deep arc grooves along the circumferential center to form the concave-convex inner surface; the tooth body is an inner trapezoidal thread matched with the trapezoidal thread of the screw rod; the difference between the radial groove depths of the shallow arc grooves and the deep arc grooves is not smaller than the tooth height; the screw sleeve sequentially comprises a first shaft section, a second shaft section, a positioning shoulder and a third shaft section; the outer diameters of the first shaft section, the second shaft section and the positioning shoulder are sequentially increased; the cam ring is in clearance fit with the second shaft section, and axial positioning is realized through the positioning shoulder and the clamping ring fixed on the first shaft section; the handle housing is secured to the third shaft section.

12. The interventional stent delivery device of claim 11, wherein the handle further comprises an arc-shaped cutting ferrule comprising a sheath sleeve locating hole section, a screw locating hole section and a button hole section with sequentially increasing inner diameters, wherein two buttons are symmetrically arranged on the button hole section; one end of the button is connected with the wall of the screw positioning hole section, the other end of the button extends to the edge of the button hole section along the axial direction, a clamping hook is continuously arranged in an extending mode, and the clamping hook is clamped in a G-shaped groove of the clamping ring; a limiting block axially extends from the side of the guide hole of the cam ring, and an arc limiting groove is formed in the end face of the corresponding screw sleeve positioning shoulder; the limiting block slides in the arc-shaped limiting groove along with the rotation of the cam ring, and two limiting positions of the limiting block sliding in the arc-shaped limiting groove correspond to the outer surface of the telescopic tooth plate to be positioned at the bottom of the shallow arc-shaped groove and the bottom of the deep arc-shaped groove respectively; the telescopic dental plate comprises a dental plate and a reed, and a reed hole is formed in the center of the dental plate; the reed is an arc-shaped spring piece penetrating through the reed hole, the supporting leg of the reed faces inwards, and the arc-shaped bow top of the reed abuts against the top of the reed hole; the corresponding screw rod sleeve is provided with reed grooves which are crossed with the radial through holes in a crisscross manner; the reed groove is a blind groove, and the supporting legs of the reed are pressed in the reed groove through the dental lamina and the cam ring; the outer surface of the cam ring is opposite to the position of the shallow arc-shaped groove, and an indicating position mark is arranged; a fast moving sign F and a slow rotating moving sign S are arranged on the corresponding handle shell; the included angle between the shallow arc-shaped groove and the deep arc-shaped groove is 50 degrees, and the included angle between the two limit positions of the corresponding arc-shaped limiting groove is 50 degrees; the included angle between the fast moving mark and the slow rotating mark is 50 degrees.

13. The interventional stent delivery device of claim 10 or 11, wherein the handle further comprises a sheath connector, a sheath connecting section of the sheath connector securing a sheath by a sheath lock nut; a guide plate is arranged on the outer peripheral surface of the sheath pipe joint; the guide plate is a near T-shaped guide plate, and a vertical section of the guide plate passes through a sheath pipe joint guide groove on the screw rod and moves in the sheath pipe joint guide groove so as to drive the sheath pipe to move along the axial direction; the horizontal section of the guide plate is clamped between the screw sleeve and the handle shell; the sheath pipe joint is provided with a middle pipe through hole for accommodating the middle pipe along the axial direction; the tail end of the middle tube through hole is used for sealing and fixing the middle tube on the sheath tube joint through a sealing ring and a sealing screw sleeve.