CN212016414U

CN212016414U - Simple adjustable bent catheter

Info

Publication number: CN212016414U
Application number: CN201922423206.6U
Authority: CN
Inventors: 蒋权杰; 黄桥; 张庭超
Original assignee: Hangzhou Weiqiang Medical Technology Co Ltd
Current assignee: Hangzhou Endonom Medtech Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-11-27
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a simple and convenient adjustable bent catheter, which comprises a catheter body and a handle component. The tube body comprises an adjustable bending section arranged at the far end of the tube body and a traction wire connected to the adjustable bending section; the handle assembly comprises a handle shell, a sliding mechanism arranged in the handle shell in an axial sliding manner, a driving mechanism connected with the sliding mechanism, and a locking structure arranged between the handle shell and the driving mechanism; the sliding mechanism comprises a sliding part connected to the proximal end of the traction wire, the driving mechanism comprises a transmission part connected to the sliding part and a driving part connected with the transmission part, the transmission part is driven to rotate by the rotation of the driving part so as to drive the sliding part to slide, and the locking structure elastically abuts against the driving part and acts synchronously with the driving part. When the driving piece rotates to any position and stops, the locking piece locks the driving piece instantly to keep the bending state of the adjustable bending section.

Description

Simple adjustable bent catheter

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a pipe that simple and convenient type is adjustable to bend.

Background

The percutaneous interventional technique has the advantages of small wound, quick recovery, less complication and the like in the aspect of treating congenital heart diseases such as atrial septal defect, ventricular septal defect, patent foramen ovale and the like and other cardiovascular diseases and the like. The catheter is used as a necessary auxiliary instrument for percutaneous interventional operation, mainly provides a channel for a guide wire, and the guide wire is guided into a target blood vessel by adjusting the distal end of the catheter to point to the entrance of the target blood vessel. The adjustable bending catheter can enable the distal end of the catheter to be bent at different angles by operating the handle so as to adapt to different physiological anatomical shapes. The adjustable bending catheter in the prior art realizes the free bending of the far end of the catheter body by controlling the handle. In the surgical procedure of selecting a target blood vessel, an operator usually needs to bend the distal end of the catheter tube repeatedly according to the structural form of the target blood vessel until the bending angle meets the physiological structural characteristics of the target blood vessel, then the bending angle of the distal end of the catheter tube is locked to keep the required bending state, and finally the guide wire is controlled at the proximal end of the handle to enable the guide wire to enter the target blood vessel along the tube. However, the handle of the existing bendable catheter is usually provided with a more complicated bending driving mechanism and a locking mechanism, which not only causes the handle to have longer length, larger volume and heavier weight, and is not beneficial to the long-time holding of a doctor, but also the bending and locking generally need two hands for cooperation operation, and the operation is inconvenient.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art, provide a simple structure, small in size, convenient operation's adjustable curved pipe.

In order to solve the technical problem, the utility model provides a simple and convenient adjustable bending catheter, which comprises a catheter body and a handle component connected with the near end of the catheter body; the tube body comprises an adjustable bending section arranged at the far end of the tube body and a traction wire connected to the adjustable bending section; the handle assembly comprises a handle shell, a sliding mechanism arranged in the handle shell in an axial sliding manner, a driving mechanism connected with the sliding mechanism, and a locking structure arranged between the handle shell and the driving mechanism; the sliding mechanism comprises a sliding part connected to the proximal end of the traction wire, the driving mechanism comprises a transmission part connected to the sliding part and a driving part connected with the transmission part, the transmission part is driven to rotate by the rotation of the driving part so as to drive the sliding part to slide, and the locking structure elastically abuts against the driving part and acts synchronously with the driving part.

The utility model provides an among the simple and convenient type adjustable bent pipe, locking structure and driving piece synchronization action, locking structure can lock the driving piece in step, once the driving piece stops rotating, locking structure locks the driving piece immediately, because handle assembly just can realize the bending of the adjustable bending section of body and lock immediately through slider, driving medium, driving piece and locking structure, therefore, adjustable bent pipe's simple structure, only operate the driving piece and just can realize the bending and the locking of adjustable bending section synchronously, the simple operation, convenient to use need not to do in addition the locking operation action; in addition, because the handle assembly has a simple structure, the assembled handle assembly has small volume and light weight, and an operator can conveniently hold and operate the handle assembly by one hand.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of an embodiment of a simple adjustable conduit according to the present invention.

Fig. 2 is a perspective view of a portion of the tubular body of the catheter of fig. 1.

Fig. 3 is an exploded perspective view of the handle assembly of the steerable catheter of fig. 1.

Fig. 4 is a perspective view of the first housing of the handle assembly of fig. 3.

FIG. 5 is a perspective view of the transmission member of the handle assembly of FIG. 3 from a perspective.

Fig. 6 is a perspective view of the drive member of the handle assembly of fig. 3 from a perspective view.

Fig. 7 is a perspective view of the locking structure of the handle assembly of fig. 3.

Fig. 8 is a perspective view of the sliding mechanism of the handle assembly of fig. 3.

Fig. 9 is an assembled structural schematic view of the handle assembly of fig. 3.

FIG. 10 is a schematic view of the flexible bendable catheter of FIG. 1 with the second housing and the driving member removed.

FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG. 9.

Fig. 12 is a schematic structural view of another embodiment of a handle assembly of a simple adjustable bending catheter according to the present invention.

Fig. 13 is a perspective view of a drive member in the handle assembly of fig. 12.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

Furthermore, the following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. Directional phrases used in this disclosure, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the attached drawing figures and, thus, are used in a better and clearer sense to describe and understand the present invention rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the invention.

Orientation definition: for clarity of description, the end of the procedure that is closer to the operator will be referred to as the "proximal end" and the end that is further from the operator will be referred to as the "distal end". This definition is for convenience of presentation only and should not be construed as limiting the invention, with "axial" referring to the axial direction of the sheath.

Referring to fig. 1 to 3, the present invention provides an adjustable bending catheter 100, which includes a catheter body 20 and a handle assembly 50 disposed at a proximal end of the catheter body 20. The tube 20 includes an adjustable bending section 21 disposed at a distal end thereof and a pull wire 23 connected to the adjustable bending section 21, a proximal end of the tube 20 is disposed in the handle assembly 50, and a proximal end of the pull wire 23 extends into the handle assembly 50. The handle assembly 50 comprises a handle shell 51, a sliding mechanism 53 axially and slidably arranged in an inner cavity of the handle shell 51, a driving mechanism 55 for driving the sliding mechanism 53 to slide, and a locking structure 56 arranged between the handle shell 51 and the driving mechanism 55; the sliding mechanism 53 includes a sliding member 531 connected to an end of the pulling wire 23 away from the adjustable bending section 21, the driving mechanism 55 includes a transmission member 551 connected to the sliding member 531 and a driving member 553 for driving the transmission member 551 to rotate, the transmission member 551 and the sliding member 531 are engaged by a gear and a rack, the driving member 553 drives the transmission member 551 to rotate to drive the sliding member 531 to slide, so as to control the pulling wire 23 to move to adjust the bending state of the adjustable bending section 221, the locking structure 56 works synchronously with the driving member 553, and when the driving member 553 rotates to an arbitrary position and stops, that is, when the adjustable bending section 221 is adjusted to an arbitrary bending state, the driving member 553 is instantly locked to maintain the bending state of the adjustable bending section 221.

In this embodiment, the length of the handle assembly 50 along the axial direction is less than 10 cm, and the width of the handle assembly 50 along the direction perpendicular to the axial direction is less than 3 cm, so that the handle assembly can be conveniently held by a single hand of an operator; preferably, the handle assembly 50 has a length in the axial direction of less than 8 cm and the handle assembly 50 has a width perpendicular to the axial direction of less than 2.5 cm.

The utility model discloses an among the simple and convenient type adjustable bent pipe 100, locking structure 56 and driving piece 553 synchronous work, locking structure 56 can lock driving piece 553 in step, namely in case driving piece 553 stall, locking structure 56 locks driving piece 553 in time, because handle assembly 50 only can realize the crooked and instant locking of the adjustable bent section 21 of body 20 through slider 531, driving piece 551, driving piece 553 and locking structure 56, therefore, the structure of adjustable bent pipe 100 is simple, only operate driving piece 553 can realize the crooked and locking of adjustable bent section 21 in step, the simple operation, high durability and convenient use, need not to do in addition locking operation action; in addition, since the handle assembly 50 of the bendable catheter 100 has a simple structure, a small volume and a light weight after assembly, an operator can conveniently hold and operate the handle assembly 50 with one hand, and specifically, the handle assembly 50 is generally operated with the left hand, and the guide wire is operated with the right hand, which more conforms to the operation habit of the operator.

As shown in fig. 2, the tube body 20 has a delivery lumen 201 extending from the proximal end to the distal end and a tube wall 203 surrounding the delivery lumen 201. The tube 20 further comprises a main body section 22 connected between the handle housing 51 and the adjustable bending section 21, and an anchoring ring 25 is fixed in the tube wall 203 of the adjustable bending section 21. A traction wire cavity 205 is formed in the tube wall 203 along the axial direction, the far end of the traction wire cavity 205 extends to the anchoring ring 25, and the near end of the traction wire cavity 205 extends to the near end of the tube body 20 and penetrates through the outer circumferential surface of the tube body 20. The pull wire 23 is movably inserted into the pull wire cavity 205, the distal end of the pull wire 23 is fixedly connected to the anchoring ring 25, the proximal end of the pull wire 23 is led out from the tube wall 203 near the proximal end of the tube body 20 and then fixedly connected to the sliding member 531, and the sliding member 531 axially and proximally slides to drive the pull wire 23 to proximally slide so as to drive the adjustable bending section 21 to bend. The adjustable bending portion 21 has elasticity, and when the slider 531 slides axially and distally to release the pulling force on the pulling wire 23, the adjustable bending portion 21 can be elastically restored.

Referring to fig. 3 and fig. 4, the handle housing 51 includes a first housing 510 and a second housing 515 opposite to the first housing 510, and the sliding mechanism 53 and the driving mechanism 55 are disposed between the first housing 510 and the second housing 515. The first housing 510 is a rectangular frame, the first housing 510 includes a first substrate 511 and a sidewall 512 protruding from the peripheral edge of the first substrate 511, and the first substrate 511 and the sidewall 512 enclose a cavity for accommodating the sliding mechanism 53 and the driving mechanism 55. The middle part of the first substrate 511 is provided with a strip-shaped positioning block 513 protruding towards the cavity, the middle part of the positioning block 513 is provided with a rotating hole 5132, the bottom surface of the rotating hole 5132 is provided with a hemispherical concave part 5110, the transmission member 551 is rotatably inserted into the rotating hole 5132, and the axis of the rotating hole 5132 is perpendicular to the axial direction of the tube body 20. A guide groove 5130 is axially provided in the handle case 50, and the slider 531 is a rack bar slidably received in the guide groove 5130. Specifically, two opposite ends of one side of the positioning block 513 extend to the proximal end and the distal end along the axial direction respectively to form a guide bar 5134, the guide groove 5130 is defined by the positioning block 513, the two guide bars 5134 and the side wall 512 adjacent to the two guide bars 5134, the rotation hole 5132 is communicated with the guide groove 5130, and the guide groove 5130 extends from one end of the first housing 510 to the other opposite end. The proximal end of the proximal bar 5134 extends a stop bar 5136 towards the guide slot 5130, the stop bar 5136 serving to stop the slider 531 from exiting the guide slot 5130; the distal end of the distal guide bar 5134 is obliquely provided with a guide bar 5137, and the guide bar 5137 and the adjacent side wall 512 enclose a through groove 5138 communicated with the guide chute 5130, and the through groove 5138 is used for the traction wire 23 to pass through. Mounting holes 5139 are respectively formed in the two opposite sides of the rotating hole 5132 of the side face of the positioning block 513 departing from the first substrate 511. A plurality of clamping flow filters 5129 are arranged on the inner peripheral surface of the side wall 512 at intervals and protruding towards the inner cavity of the first shell 510, and a plurality of clamping blocks 5129 are arranged along the edge of the side wall 512.

The sidewall 512 of the distal end of the first housing 510 defines a distal snap interface 5121, and the sidewall 512 of the proximal end of the first housing 510 defines a proximal snap interface 5124. A far-end supporting piece 5122 is arranged in the inner cavity of the first shell 510 and close to the far-end card interface 5121, a far-end clamping groove 5123 is formed between the side wall 512 at the far end of the first shell 510 and the far-end supporting piece 5122, a through hole is axially formed in the far-end supporting piece 5122, and the through hole of the far-end supporting piece 5122 is aligned with the far-end card interface 5121. Two near-end supporting pieces 5125 which are spaced from each other are arranged in the inner cavity of the first shell 510 and are adjacent to the near-end clamping interface 5124, a near-end clamping groove 5126 is defined between the two near-end supporting pieces 5125, and through holes are axially formed in the two near-end supporting pieces 5125 and aligned with the near-end clamping interface 5124. The inner cavity of the first housing 510 is provided with a plurality of middle support pieces 5127 at one side departing from the sliding guide groove 5130, the middle support pieces 5127 are arranged at intervals along the axial direction, and each middle support piece 5127 is provided with a through hole along the axial direction. Two opposite side walls of the first housing 510 in the width direction are respectively provided with a concave portion 5112, the two concave portions 5112 are located at two opposite sides of the positioning block 513, and each concave portion 5112 is provided with a through groove 5114 communicating with the inner cavity of the first housing 510.

As shown in fig. 3, the external shape of the second casing 515 is similar to that of the first casing, and specifically, the second casing 515 includes a second substrate 516 and a sidewall 518 protruding from the peripheral edge of the second substrate 516. A sidewall 518 at the distal end of second housing 515 defines a distal clip interface 5181 and sidewall 518 at the proximal end of second housing 515 defines a proximal clip interface (not labeled). Two opposite side walls 518 of the second housing 515 in the width direction are respectively provided with a concave portion 5182, the two concave portions 5182 respectively correspond to the two concave portions 5112 of the first housing 510, and each concave portion 5182 is provided with a through groove 5184 penetrating through the inner cavity of the second housing 515. The inner surface of the second base plate 516 is protruded with a guide ring 5185, and the axis of the guide ring 5185 is collinear with the axis of the rotary hole 5132. A plurality of clamping pieces 5187 are convexly arranged on the side surface of the side wall 518 departing from the second substrate 516, and the plurality of clamping pieces 5187 are correspondingly clamped with the plurality of clamping blocks 5129 of the first shell 510 one by one. In order to reduce the weight of the handle assembly 50, the first and

second housings

510 and 515 are preferably made of a hard injection molding material.

Referring to fig. 3 and 5, the transmission member 551 includes a positioning rod 5512 connected to the driving member 553, and a transmission gear 5514 disposed at one end of the positioning rod 5512. The positioning rod 5512 is kidney-shaped in cross-section to facilitate connection of the transmission 551 to the drive member 553. In other embodiments, the cross-section of the positioning rod 5512 may be a non-circular shape such as a rectangle or a polygon. A hemispherical convex hull 5515 is convexly arranged in the middle of the end face of the transmission gear 5514, which is far away from the positioning rod 5512.

Referring to fig. 3 and fig. 6, the driving member 553 is a wheel rotatably connected to the handle casing 51, an axis of the wheel is perpendicular to an axial direction of the tube 20, and a portion of the wheel is exposed out of the handle casing 51 to facilitate the rotation of the finger striking driving member 553. The driving member 553 has a fixing hole 5532 formed in a middle portion thereof in an axial direction. In this embodiment, the fixing hole 5532 is a waist-shaped hole corresponding to the positioning rod 5512. In other embodiments, the fixing hole 5532 may have a non-circular shape such as a rectangle, a polygon, or the like. The side surface of the driving member 553 facing the rotating hole 5132 is provided with at least one circle of positioning holes 5534 around the axis of the rotating hole 5532, and the edge of each positioning hole 5534 is rounded. The driving member 553 and the handle housing 51 are connected to the guide ring 5185 through an annular groove 5537, and the axes of the annular groove 5537, the guide ring 5185 and the driving member 553 are collinear. In this embodiment, a protrusion 5536 is disposed on the other side surface of the driving element 553 opposite to the positioning hole 5534, the fixing hole 5532 penetrates through the protrusion 5536, the protrusion 5536 is disposed with the annular groove 5537 therein, the axis of the annular groove 5537 is collinear with the axis of the driving element 553, and the guide ring 5185 is rotatably received in the annular groove 5537. The driving member 553 has a plurality of anti-slip teeth 5538 formed on an outer circumferential surface thereof in a circumferential direction thereof to facilitate rotation of the driving member 553 by finger operation.

In this embodiment, the driving member 551 and the driving member 553 are preferably made of hard injection molding material such as ABS/PC, etc. to reduce weight.

In other embodiments, a guide ring may be disposed on the driving member 553, and an annular groove may be formed on the inner surface of the handle housing 51 corresponding to the guide ring, so that the guide ring of the driving member 553 is rotatably received in the annular groove of the handle housing 51.

In other embodiments, the transmission member 551 and the driving member 553 may be an integral structure, i.e., the transmission member 551 is protruded on a side of the driving member 553 facing the rotation hole 5132.

In other embodiments, the driving member 551 and the driving member 553 can be fixed by screwing, gluing or welding.

In other embodiments, the outer peripheral surface of the driving member 553 may be provided with anti-slip patterns or roughened.

Referring to fig. 3 and 8, in the present embodiment, the sliding member 531 is a sliding rack slidably received in the sliding groove 5130 of the first housing 510, and the sliding rack is engaged with the transmission gear 5514 of the transmission member 551. Specifically, the sliding member 531 includes a strip-shaped sliding block 5310, one side of the sliding block 5310 is provided with a row of teeth 5312 along the length direction thereof, the other side of the sliding block 5310 away from the row of teeth 5312 is provided with a wire take-up groove 5314 and a connecting hole 5315, the wire take-up groove 5314 extends along the length direction of the sliding block 5310 and penetrates through two opposite end faces of the sliding block 5310; the connecting hole 5315 is located in the middle of the sliding block 5310, and the connecting hole 5315 is communicated with the wire take-up groove 5314. The sliding mechanism 53 further includes a connecting block 533 which can be snapped into the connecting hole 5315, the proximal end of the pull wire 23 is inserted into the wire receiving groove 5314 and fixed to the connecting block 533, and the connecting block 533 is inserted into the connecting hole 5315, thereby connecting the proximal end of the pull wire 23 to the slider 531. The slider 531 and the connecting block 533 may be made of a hard injection molding material or a metal material such as stainless steel, and in this embodiment, the hard injection molding material is preferable to reduce the weight.

Referring to fig. 3 and 7, the handle assembly 50 further includes a locking structure 56 disposed between the handle housing 51 and the driving member 553, wherein the locking structure 56 is used for locking the driving member 553 immediately after the driving member 553 stops rotating to any position. Specifically, the locking structure 56 includes at least one elastic element 562 and a positioning portion 564 disposed at an end of the elastic element 562, and the elastic element 562 elastically pushes the positioning portion 564, so that the positioning portion 564 abuts against the driving element 553. In this embodiment, the elastic element 562 is disposed in the handle housing 51, and the elastic element 562 can elastically push the positioning portion 564, so that the positioning portion 564 is snapped into any positioning hole 5534 of the driving element 553. Specifically, the elastic member 562 may be a spring extending in a direction parallel to the axial direction of the driving member 553. The positioning portion 564 is a spherical clamping bead fixedly connected to one end of the spring. Preferably, the number of the elastic members 562 and the positioning portions 564 is two, the two elastic members 562 are respectively installed in the two first installation holes 5139 of the first housing 510, and the two positioning portions 564 can be respectively snapped into the two corresponding positioning holes 5534 of the driving member 553, so as to lock the driving member 553 more reliably. Further, the centers of the two elastic pieces 562 are point-symmetrical with respect to the center of the driving piece 553 to balance the locking force.

In other embodiments, the resilient member 562 and the positioning portion 564 of the locking structure 56 can be an integral structure, for example, the locking structure 56 can be a spring ball plunger, which can be mounted on the handle housing 51 or the driving member 553, and the ball of the spring ball plunger can elastically abut against the driving member 553 or the handle housing 51; when the spring ball plunger is mounted on the handle housing 51, the ball elastically pushes against the positioning hole 5534 of the driving member 553, so as to lock the driving member 553 instantly; when the spring ball plunger is mounted on the driving member 553, a circle of positioning holes are formed on the handle housing 51, and accordingly, the ball of the spring ball plunger elastically pushes into the positioning hole 5534 of the handle housing 51 to lock the driving member 553 instantly.

In other embodiments, the locking structure 56 may also include a locking rod with a smooth spherical end and made of plastic and a spring fixedly connected to the locking rod.

As shown in fig. 3 and 9-11, the handle assembly 50 further includes a buffer head 57 and a luer connector 58, the buffer head 57 is disposed at the distal end between the first casing 510 and the second casing 515, and the luer connector 58 is disposed at the proximal end between the first casing 510 and the second casing 515. Specifically, a through hole 570 is axially formed in the buffer head 57, a clamping block 572 is convexly arranged on the near side of the near end of the buffer head 57 at the periphery of the through hole 570, and a circle of clamping groove 574 is formed in the outer peripheral surface of the clamping block 572; the luer connector 58 comprises a circular tube 580, a positioning ring 581 is disposed at the middle of the outer peripheral surface of the circular tube 580, and two positioning pieces 583 are disposed at intervals at the distal end of the outer peripheral surface of the circular tube 580.

Referring to fig. 1 to 11, when the adjustable bendable catheter 100 is assembled, the clamping block 572 of the buffering head 57 is clamped into the distal clamping groove 5123 of the first housing 510, the edge of the distal clamping interface 5121 is clamped into the clamping groove 574 of the buffering head 57, and the through hole 570 is aligned with the through hole of the distal supporting piece 5122; the proximal end of the tube body 20 is connected to the round tube 580 of the luer connector 58 after sequentially passing through the through hole 570 of the buffer head 57, the through hole of the support piece 5122 and the through hole of the middle support piece 5127; the positioning piece 583 of the luer 58 close to the positioning ring 581 is clamped into the proximal clamping groove 5126 of the first housing 510, the round tube 580 is clamped into the through hole of the proximal clamping groove 5126 and the proximal clamping port 5124, and the positioning ring 581 abuts against the side wall 512. The proximal end of the traction wire 23 is extended into the sliding groove 5130 through the through groove 5138 of the first housing 510, the proximal end of the traction wire 23 is passed through the wire retracting groove 5314 and fixed to the connecting block 533, and the connecting block 533 is inserted into the connecting hole 5315 of the slider 531. The slider 531 is accommodated in the slide groove 5130 of the first housing 510 such that the teeth 5312 of the slider 531 face the rotation hole 5132. The positioning rod 5512 of the transmission member 551 is clamped in the fixing hole 5532 of the driving member 553, the two locking structures 56 are respectively installed in the two installation holes 5139 of the first shell 510, the transmission gear 5514 of the transmission member 551 is inserted into the rotating hole 5132 of the first shell 510, the convex hull 5515 is rotatably accommodated in the concave part 5110, the transmission gear 5514 is meshed with the teeth 5312 of the sliding member 531, and the two positioning parts 564 are respectively abutted into the two corresponding positioning holes 5534, and because the edge of each positioning hole 5534 is chamfered, the positioning parts 564 can be prevented from being blocked when being separated from the corresponding positioning holes 5534. The second casing 515 is covered on the first casing 510, so that the guide ring 5185 is inserted into the annular groove 5537, the edge of the distal end clip interface 5181 of the second casing 515 is clipped into the clip groove 574 of the buffer head 57, and the circular tube 580 is clipped in the space enclosed by the proximal end clip interface 5124 of the first casing 510 and the proximal end clip interface of the second casing 515. The plurality of snap fasteners 5129 are respectively snapped into snap holes of corresponding snap tabs 5187. At this time, the driving mechanism 55, the sliding mechanism 53 and the locking mechanism 56 are accommodated between the first casing 510 and the second casing 515, and a space surrounded by the through groove 5114 of the first casing 510 and the through groove 5184 of the second casing 515 extends from both sides of the driving member 553 in the width direction. Therefore, the opposite sides of the driving element 553 are respectively accommodated in the area enclosed by the recess 5112 of the first housing 510 and the recess 5182 of the second housing 515, which can reduce the width of the handle assembly 50 along the direction perpendicular to the axial direction, save space, and facilitate the holding with one hand of the operator.

In use of the adjustable bend catheter 100, the operator grasps the handle assembly 50 with one hand and inserts the guidewire through the barrel 580 of the luer fitting 58 and into the delivery lumen 201 of the body 20 with the other hand until the guidewire is moved into position, typically by grasping and manipulating the handle assembly 50 with the left hand and manipulating the guidewire with the right hand; the driving member 553 is operated by one hand to rotate, the elastic member 562 is forced to elastically deform to separate the positioning portion 564 from the corresponding positioning hole 5534, and the driving member 553 drives the transmission member 551 to rotate; since the transmission gear 5514 is engaged with the teeth 5312 of the sliding member 531, the transmission gear 5514 of the transmission member 551 drives the sliding member 531 to slide in the sliding slot 5130, so as to drive the traction wire 23 connected to the sliding member 531 to move axially, and further bend the adjustable bending section 21, when the adjustable bending section 21 is adjusted to be bent to a suitable state, the rotation of the driving member 553 is stopped, and the elastic member 562 is restored to deform to push the positioning portion 564 to be clamped into the corresponding positioning hole 5534. Since the positioning hole 5534 and the positioning portion 564 form a static friction force under the action of the elastic member 562 to prevent the driving member 55 and the driving member 551 from rotating, the driving member 553 can be reliably locked instantly, so that the sliding member 531 is kept at a desired position to complete the locking of the desired bending state of the adjustable bending section 21 of the tube 20. It can be seen that, when the driving member 553 rotates to any position, the locking structure 56 can lock the driving member 553 at the position in real time, and only one hand is needed to rotate the driving member 553, and no locking operation is needed, so that the pipe body 20 can be bent and locked in real time, and the operation is convenient. The handle assembly 50 has a simple and compact structure and is easy to assemble, and the sizes of all parts can be made into smaller sizes, so that the length of the whole handle assembly 50 is reduced, the volume is reduced, the weight is reduced, and the handle assembly is convenient for a doctor to hold and operate by one hand. In addition, due to the reduction of the length of the handle assembly 50, the length of the traction wire 23 corresponding to the position in the handle shell 51 is correspondingly reduced, the length proportion entering the human body is increased, and the utilization rate of the traction wire 23 is improved.

It will be appreciated that when the driver 553 is rotated in a single hand reverse direction, the adjustable bend section 21 will gradually return to its initial, i.e., straightened, position.

In other embodiments, the driving member 553 can be disposed near the proximal end of the handle housing 51 to facilitate left-handed grasping and manipulation of the handle assembly 50 by an operator and manipulation of the guidewire by the right hand, thereby facilitating better compliance with operator's operating habits and reducing operating time.

Referring to fig. 12 and 13, another embodiment of the adjustable bending conduit according to the present invention is similar to the above embodiment, except that: the position of the locking structure 56a in the handle housing 51 and the position of the positioning hole 5534a on the driver 553a are different from the above-described embodiments;

specifically, the driving member 553a is also a wheel, an outer circumferential wall of the wheel is circumferentially provided with at least a plurality of positioning holes 5534a wound into a circle, the elastic member 562a of the locking structure 56a is a spring disposed in the handle housing 51, and an extending direction of the spring is perpendicular to an axial direction of the driving member 553 a; the elastic piece 562a elastically pushes the positioning part 564a to be snapped into any one of the positioning holes 5534 a. Preferably, two opposite locking structures 56a are disposed in the handle housing 51, and the elastic elements 562a of the two locking structures 56a respectively elastically push the positioning portions 564a to be clamped into the corresponding positioning holes 5534a, so as to achieve instant and reliable locking of the driving element 553a, thereby completing locking of the bending state of the adjustable bending section 21 of the pipe body 20.

The above is an implementation manner of the embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principles of the embodiments of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. A simple adjustable bending catheter is characterized by comprising a catheter body and a handle assembly connected with the proximal end of the catheter body;

the tube body comprises an adjustable bending section arranged at the far end of the tube body and a traction wire connected to the adjustable bending section;

the handle assembly comprises a handle shell, a sliding mechanism arranged in the handle shell in an axial sliding manner, a driving mechanism connected with the sliding mechanism, and a locking structure arranged between the handle shell and the driving mechanism; the sliding mechanism comprises a sliding part connected to the proximal end of the traction wire, the driving mechanism comprises a transmission part connected to the sliding part and a driving part connected with the transmission part, the transmission part is driven to rotate by the rotation of the driving part so as to drive the sliding part to slide, and the locking structure elastically abuts against the driving part and acts synchronously with the driving part.

2. The catheter of claim 1, wherein the locking structure comprises at least one elastic member and a positioning portion disposed at an end of the elastic member, and the elastic member elastically pushes the positioning portion to make the positioning portion abut against the driving member.

3. The simple adjustable curved catheter according to claim 2, wherein a plurality of positioning holes are formed in one side surface of the driving member around the axis of the driving member, the elastic member is disposed on the handle housing, and the elastic member elastically pushes the positioning portion to be inserted into any one of the positioning holes.

4. The easy and convenient adjustable bendable catheter according to claim 2, wherein the peripheral wall of the driving member is circumferentially provided with at least one circle of a plurality of positioning holes, the elastic member is disposed on the handle housing, and the elastic member elastically pushes the positioning portion to be clamped into any of the positioning holes.

5. The catheter of any one of claims 1 to 4, wherein a guide slot is axially formed in the handle housing, the sliding member is a sliding rack slidably received in the guide slot, and the transmission member comprises a transmission gear engaged with the sliding rack.

6. The catheter of claim 5, wherein the driving member is a wheel rotatably connected to the handle housing, an axial direction of the wheel is perpendicular to an axial direction of the catheter body, and a portion of the wheel is exposed out of the handle housing.

7. The catheter of claim 6, wherein the handle shell has through grooves on opposite sides in the width direction thereof for communicating with the inner cavity of the handle shell, and a portion of the wheel disc passes through the through grooves and is exposed out of the handle shell.

8. The catheter of claim 7, wherein the handle housing is provided with a recess on each of two widthwise opposite sides thereof, and each of the through grooves communicates with the corresponding recess.

9. The simple adjustable-bending catheter according to claim 5, wherein the driving member has a fixing hole along an axial direction thereof, the transmission member further comprises a positioning rod, the positioning rod is adapted to be engaged with the fixing hole, so that the driving member and the transmission member rotate synchronously, and the transmission gear is disposed at an end of the positioning rod.

10. The easy adjustable bending catheter according to claim 1, wherein the handle housing has a length of less than 10 cm and a width of less than 3 cm.