CN116271428A

CN116271428A - Bending control device and adjustable bent sheath tube

Info

Publication number: CN116271428A
Application number: CN202310492634.2A
Authority: CN
Inventors: 陈豪; 傅丹; 黄龙; 宋庆; 冯君
Original assignee: Xinhang Medical Technology Guangzhou Co ltd
Current assignee: Xinhang Medical Technology Guangzhou Co ltd
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-06-23
Anticipated expiration: 2043-05-05
Also published as: CN116271428B

Abstract

The invention relates to bending control of medical equipment, in particular to a bending control device and an adjustable bending sheath tube. The bending control device comprises a main body, a first traction unit and a second traction unit, wherein the first traction unit comprises a threaded rod and a sliding block, the sliding block is in threaded transmission connection with the threaded rod so as to convert rotation of the threaded rod into guiding movement of the sliding block, and the sliding block is used for driving the first traction wire to act so as to drive a first bending section of the controlled bending structure to bend; the second traction unit comprises a transmission input part and a traction wire driving part, the traction wire driving part is used for driving the second traction wire to act so as to drive a second bending section of the controlled bending structure to bend, a connection structure is arranged between the transmission input part and the sliding block, the sliding block has an independent stroke separated from the transmission input part, and the sliding block also has a combination stroke combined with the transmission input part through the connection structure so as to drive the second traction unit to act. The invention mainly solves the problem that the front bending section can not meet certain bending control requirements.

Description

Bending control device and adjustable bent sheath tube

Technical Field

The invention relates to bending control of medical equipment, in particular to a bending control device and an adjustable bending sheath tube.

Background

For interventional medical devices such as ablation catheters, endoscopes, sheaths (for providing access to the body for ablation catheters, endoscopes, etc.), etc., such interventional medical devices often require bend control during use. Such bending control is typically achieved by tightening and loosening the pull wires located in the leading bending section of the respective tube body. The traction wires can be arranged in pairs, and are respectively positioned at two opposite sides in the radial direction of the front end bending section, the traction wire at one side is tightened, the traction wire at the other side is loosened, and the front end bending section can bend towards the traction wire tightening side. The tightening and loosening of the traction wires is generally controlled by a bending control device.

At present, catheter ablation has become an important treatment mode of atrial fibrillation (atrial fibrillation, which is simply called atrial fibrillation, is the most common arrhythmia in clinic, the incidence rate of the atrial fibrillation gradually rises along with the increase of the age), and in the atrial fibrillation ablation process, an ablation catheter needs to be matched with a sheath tube for use to reach different parts of heart tissues. However, as shown in fig. 15, most of the current sheaths 200 can only achieve a single J-bend, and for some specific anatomical locations of the heart tissue 100, it is necessary to control the sheath 200 and the ablation catheter 300 (shown as a balloon catheter) to bend in different directions, respectively, so that the two are matched to form a specific bend shape to reach the target location of the ablation catheter 300.

However, in order to control the sheath 200 and the ablation catheter 300 to bend in different directions, an operator needs to simultaneously control the sheath 200 and the ablation catheter 300, and each instrument needs to be operated by a left hand or a right hand, which is complex to operate, long in guiding and positioning time and increases operation time and difficulty.

Disclosure of Invention

The invention mainly solves the technical problem that the front end bending section cannot meet certain bending control requirements.

In a first aspect, the present invention provides a bend control device.

A bend control device comprising:

a main body;

the first traction unit comprises a threaded rod and a sliding block, the threaded rod is rotatably assembled on the main body, and the sliding block is assembled on the main body along the axial direction of the threaded rod in a guiding way; the sliding block is in threaded transmission connection with the threaded rod so as to convert rotation of the threaded rod into guiding movement of the sliding block, and the sliding block is used for driving the first traction wire to act so as to drive the first bending section of the controlled bending structure to bend;

the second traction unit comprises a transmission input part and a traction wire driving part in transmission connection with the transmission input part, and the traction wire driving part is used for driving a second traction wire to act so as to drive a second bending section of the controlled bending structure to bend;

the sliding block is provided with an independent stroke separated from the transmission input piece in the guiding movement process, and is also provided with a combined stroke combined with the transmission input piece through the connection structure so as to drive the second traction unit to act.

In one technical scheme, the transmission input piece is a transmission rod rotationally assembled on the main body, the connection structure is a threaded transmission structure, the connection structure comprises a spiral tooth arranged on one of the sliding block and the transmission rod, and further comprises a spiral groove arranged on the other of the sliding block and the transmission rod, and the spiral tooth is in threaded transmission fit with the spiral groove.

In one technical scheme, the transmission input piece is a transmission rod rotationally assembled on the main body, the connection structure is in a cam form, and comprises a spiral guide groove arranged on one of the sliding block and the transmission rod and a guide pin arranged on the other of the sliding block and the transmission rod, and the guide pin is used for being in guide fit with the guide groove.

In one technical scheme, the second traction unit is arranged on one side, far away from the threaded rod, of the sliding block, and the sliding block is combined with the transmission input piece through the connection structure in the process of moving towards the second traction unit.

In one technical scheme, the bending control device comprises a reversing pulley, wherein the reversing pulley is rotatably assembled on the main body, and the rotation axis is perpendicular to the guiding movement direction of the sliding block; the reversing pulley is used for winding one of the first traction wires to realize reversing.

In one technical scheme, the traction wire driving piece is a rotating piece rotationally assembled on the main body, the traction wire driving piece is provided with end faces which are positioned on two sides of a rotation axis of the traction wire driving piece and are parallel to the guiding direction of the sliding block, the end faces are provided with convex parts, the convex parts are used for poking a second traction wire with fixed end parts when the traction wire driving piece rotates in a first direction so as to realize tensioning of the second traction wire, and the second traction wire is released when the traction wire driving piece rotates in the opposite direction so as to realize loosening of the second traction wire.

In one technical scheme, at least one pair of convex parts is arranged on the end face of the traction wire driving piece, and the two pairs of convex parts are positioned on two sides of the rotation center of the traction wire driving piece and used for the second traction wire to form an S-shaped winding.

In one technical scheme, the traction wire driving piece is provided with one part, the convex parts are provided with two pairs, and the two pairs of convex parts are used for respectively winding the two second traction wires.

In one technical scheme, a driving bevel gear is arranged on the transmission input piece, the traction wire driving piece is a driven bevel gear matched with the driving bevel gear, two driven bevel gears are arranged at two positions, and the two driven bevel gears are respectively used for driving one second traction wire; at least one driven bevel gear is movably arranged along the axial direction, and the driven bevel gear which is movably arranged along the axial direction is provided with a combination position meshed with the driving bevel gear and a disconnection position separated from the driving bevel gear on a movable path.

In a second aspect, the present invention provides an adjustable bend sheath.

An adjustable bend sheath comprising:

the pipe body is used for establishing a communication channel in the target body; the tube body comprises a front end bending section, wherein the front end bending section comprises a first bending section and a second bending section;

the first traction wire is used for driving the first bending section to bend, and the second traction wire is used for driving the second bending section to bend;

and a control handle, the control handle comprising: a main body;

The invention has the beneficial effects that:

according to the bending control device, the first traction unit can control the first bending section of the controlled bending structure to bend, the second traction unit can control the second bending section of the controlled bending structure to bend, and the sliding block of the first traction unit has an independent stroke and a combined stroke, so that the sliding block in the independent stroke can independently control the first traction unit to realize the first bending shape, and the sliding block in the combined stroke can control the second traction unit to bend and enable the first bending section and the second bending section to be combined to form the second bending shape, thereby enabling the controlled bending structure to realize more bending types and meeting more bending control demands; meanwhile, through the connection structure, the first traction unit and the second traction unit can be driven by the same driving part, and the operation is complicated due to the fact that the traction units are added.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an adjustable bend sheath of the present invention;

FIG. 2 is a schematic view of the internal structure of the control handle of the adjustable bend sheath of FIG. 1;

FIG. 3 is an exploded view of the control handle of the adjustable bend sheath of FIG. 2;

fig. 4 is a schematic structural view of a diverting pulley;

FIG. 5 is an orthographic view of a slider in a control handle with the projection direction along the direction of the guided movement of the slider;

FIG. 6 is a perspective view of a drive knob;

FIG. 7 is a schematic view of a driving process of the driven bevel gear to the second traction wire;

FIG. 8 is a schematic diagram of the first traction unit and the second traction unit of FIG. 1 before being combined;

FIG. 9 is a schematic view of the first traction unit and the second traction unit of FIG. 1 after being combined, showing a cross-sectional view of the portion indicated by the straight arrow;

FIG. 10 is a comparison of different operating states of two driven bevel gears;

FIG. 11 is a schematic view of an adjustable bend sheath of the present invention;

FIG. 12 is a schematic view of another embodiment of an adjustable bend sheath of the present invention;

FIG. 13 is a schematic diagram illustrating the matching relationship between the slider and the driving rod in FIG. 12;

FIG. 14 is a schematic view of another embodiment of a traction wire drive;

fig. 15 is a schematic view of one use of the sheath and ablation catheter during atrial fibrillation ablation.

List of feature names corresponding to reference numerals in the figure:

10. a control handle; 11. a main body;

20. a tube body; 21. a first curved section; 22. a second curved section; 23. a fixing ring;

30. a first traction unit; 31. a threaded rod; 32. a plug-in column; 33. a fixing seat; 34. a slide block; 35. spiral teeth;

40. a driving part; 41. a plug hole;

50. a second traction unit; 51. a transmission input; 52. a spiral groove; 53. a drive bevel gear; 54. a driven bevel gear; 55. a convex portion;

61. a guide pin; 62. a guide groove;

71. a reversing pulley; 72. a fixing pin; 73. a sheath holder; 74. a hemostatic valve; 75. a sheath cap; 76. a three-way valve; 77. a hose; 78. a sheath;

81. a first traction wire; 82. a second traction wire;

100. heart tissue; 200. a sheath; 300. an ablation catheter.

Detailed Description

The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.

Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.

In the embodiment of the invention, by arranging the first traction unit 30 and the second traction unit 50, the bending control device can drive the first traction wire 81 and the second traction wire 82 respectively through the first traction unit 30 and the second traction unit 50, meanwhile, a connection structure is arranged between the sliding block 34 in the first traction unit 30 and the transmission input piece in the second traction unit 50, the connection structure can convert a part of the guiding stroke of the sliding block 34 into the action of the second transmission input piece so as to drive the second traction unit 50 to act, thus, the first bending section 21 of the controlled bending structure can be bent by the sliding block 34 in the first traction unit 30 only by independently controlling the rotation of the threaded rod 31, the second bending section 22 of the controlled bending structure can be bent by the connection structure, the bending form is richer, more bending forms can be realized, the bending control requirement can be better met, and meanwhile, only one part is required to be operated, and the first traction unit 30 and the second traction unit 50 are not required to be operated separately, so that the bending control device is convenient to use.

Embodiments of the adjustable bend sheath of the present invention:

referring to fig. 1, the adjustable curved sheath includes a control handle 10, a tube 20, and two sets of traction wires (referring to fig. 2 and 9, one set of traction wires includes two first traction wires 81, and the other set of traction wires includes two second traction wires 82). The tube body 20 is used for establishing a communication channel in the target body, the proximal end of the tube body is connected to the control handle 10, the distal end of the tube body is provided with a front end bending section, the front end bending section comprises a first bending section 21 and a second bending section 22, and the first bending section 21 and the second bending section 22 can realize bending as shown in fig. 11. The distal end of the first bending section 21 and the distal end of the second bending section 22 both comprise a fixed ring 23, the symmetrical two sides of the fixed ring of the first bending section 21 are respectively fixedly connected with the distal ends of the two first traction wires 81, and the symmetrical two sides of the fixed ring of the second bending section 22 are respectively fixedly connected with the distal ends of the two second traction wires 82; a traction wire channel is arranged in the pipe wall of the pipe body 20, corresponding traction wires can pass through and are led into the control handle 10, the control handle 10 tightens the corresponding traction wires, and the corresponding first bending section 21 and/or the corresponding second bending section 22 can bend towards the traction wire tightening side. It should be noted that "proximal" and "distal" are commonly referred to in the medical field, and for an instrument such as a catheter or a sheath, reference is made to the double-headed arrow in fig. 1, where the proximal end is near the operator of the instrument and the distal end is far from the operator of the instrument. In addition, the control of the distal bending section by the pull wire is a typical control manner commonly used for such medical devices, and the core improvement of the present invention is not to be seen in how the pull wire controls the bending itself of the distal bending section, so the specific structure will not be described in detail herein, and the bending control means corresponding to the control handle 10 will be mainly described below.

The control handle 10 includes a main body 11, please refer to fig. 1 to 4, in an embodiment, the main body 11 may include two half-shells that are fastened and fixed to each other, and a rotating seat for rotating and assembling an inner corresponding rotating member, a guiding structure (such as a guiding rib) for guiding and assembling an inner corresponding guiding member, and a fixing structure for fixing and assembling an inner corresponding fixing member may be disposed on an inner wall of the half-shells. The rotating seat, the guiding structure, the fixing structure and the like can be all conventional structures in the art, and can be realized by a person skilled in the art without creative labor, and are not specifically described herein. The main body 11 is further provided with other accessories, for example, a sheath 78 for passing the sheath and preventing the sheath from being excessively bent and damaged is arranged at the distal end of the main body 11, a sheath seat 73, a hemostatic valve 74 and a sheath cover 75 are arranged at the proximal end of the main body 11, a hose 77 is further connected to the sheath seat 73, and a three-way valve 76 is connected to the other end of the hose 77. Such accessories may take on conventional configurations in the art and are not directly related to the core improvements of the present invention, and the specific configuration will not be described in detail herein.

In one embodiment, referring to fig. 2, 3 and 8 to 10, the first traction unit 30 includes a threaded rod 31 and a slider 34, the threaded rod 31 is rotatably mounted on the main body 11, so as to enable axial positioning, and the slider 34 is mounted on the main body 11 along the axial guide of the threaded rod 31; the slide 34 is in threaded connection with the threaded rod 31 in order to convert the rotation of the threaded rod 31 into a guiding movement of the slide 34. In a specific embodiment, the distal end of the main body 11 is rotatably sleeved with a driving component 40, the driving component 40 is a driving knob, the distal end surface of the threaded rod 31 is circumferentially provided with plug posts 32, the distal inner wall of the driving component 40 is provided with plug holes 41 (refer to fig. 6), and the plug posts 32 are plugged by the plug holes 41, so that the fixing and transmission connection between the driving component 40 and the threaded rod 31 can be realized.

Referring to fig. 3, 4 and 5, the distal end of the slider 34 is of a sleeve-shaped structure, and an inner wall is provided with an internal thread for forming a threaded transmission connection with the threaded rod 31; the cross section of the proximal end of the sliding block 34 is arc-shaped, and the inner wall is provided with spiral teeth 35, wherein the spiral teeth 35 are used for being connected with the second traction unit 50, so that the sliding block 34 can drive the second traction unit 50 to act. Specific connection structures will be described below. In order to realize the guiding assembly of the sliding block 34, two clamping grooves are formed in the bottom surface of the sliding block 34 and can be guided and clamped on the guiding ribs on the inner wall of the main body 11. Of course, the guide form of the slider 34 is not limited thereto, and for example, the guide may be implemented by using the outer wall of the sleeve-like structure. The sliding block 34 is provided with a fixing seat 33 for fixing the corresponding traction wire, the fixing seat 33 can be a steel sleeve for tightly holding and fixing the traction wire, and can also be in other forms, such as a set screw. The fixing base 33 can be used for fixedly connecting the proximal ends of the two first traction wires 81, wherein the proximal end of one first traction wire 81 extends along the guiding direction of the sliding block 34 and is fixed on the fixing base 33, and the proximal end of the other first traction wire 81 bypasses the reversing pulley 71 and is reversely fixed on the fixing base 33. Referring to fig. 4, the reversing pulley 71 is rotatably mounted on the inner wall of the main body 11 at a side near the proximal end of the travel end of the slider 34, and the rotation axis is perpendicular to the guiding movement direction of the slider 34. In one embodiment, the circumference of the diverting pulley 71 is provided with a U-shaped groove for the first traction wire 81 to embed in, preventing the first traction wire 81 from slipping off. The two first traction wires 81 are arranged in the above manner, when the sliding block 34 moves in a guiding manner, one first traction wire 81 can move in the same direction as the sliding block 34, and the other first traction wire 81 moves reversely through the reversing pulley 71, so that one elastic action of the two first traction wires 81 is realized, and further bending control of the first bending section 21 is realized. The first traction wire 81 and the second traction wire 82 can pass through grooves, holes and avoiding spaces arranged on the main body 11 and penetrate into the pipe body 20.

In one embodiment, the second traction unit 50 comprises a transmission input member 51 and a traction wire drive member in transmission connection with the transmission input member 51, the traction wire drive member being a rotating member having end surfaces located on both sides of its own axis of rotation and parallel to the guiding direction of the slider. In one embodiment, the traction wire drive is two driven bevel gears 54. The two driven bevel gears 54 are respectively used for driving a second traction wire 82 to act so as to drive the second bending section 22 of the controlled bending structure (the controlled bending structure in this embodiment is the front bending section of the bending sheath tube) to bend, and a specific implementation manner of driving the second traction wire 82 by the driven bevel gears 54 will be described below.

In a specific embodiment, the transmission input member 51 is a transmission rod rotatably mounted on the main body 11, the axial direction of which coincides with the axial direction of the threaded rod 31, and which may be, for example, coaxial with or parallel to the threaded rod 31; the proximal end of the drive input 51 is provided with a helical groove 52 for mating with the helical teeth 35 on the slider 34 to form a threaded drive. The distal end of the drive input member 51 is provided with a drive bevel gear 53, and a driven bevel gear 54 is rotatably fitted to the main body 11 and engaged with the drive bevel gear 53, the end face of the driven bevel gear 54 being parallel to the axis of the drive rod due to the crossed drive characteristic of the bevel gears.

In some other embodiments, the helical teeth 35 may be disposed on the transmission input member 51, where the outer circumferential surface of the rod body of the transmission input member 51 forms a convex structure, and the helical groove 52 is disposed on the slider 34, and the inner wall of the slider 34 forms a concave structure on the surface thereof. The transmission input piece 51 is in threaded transmission fit with the sliding block 34, so that guiding movement of the sliding block 34 can be converted into rotation of the transmission input piece 51, a connection structure is formed, the sliding block 34 can drive the second traction unit 50 to act on a corresponding stroke, and stable transmission can be realized. In a specific embodiment, the second traction unit 50 is disposed on a side of the slider 34 away from the threaded rod 31, the slider 34 has an independent stroke separated from the transmission input member 51 during the guiding movement, and the slider 34 continues to move in the proximal direction after moving in the proximal direction to the end of the independent stroke, i.e. moving towards the second traction unit 50, and then enters the coupling stroke, and can be coupled with the transmission input member 51 through the connection structure to drive the second traction unit 50 to act. The independent travel of the slider 34 enables the first curved section to form a degree of a first curved shape (in this embodiment, a J-shaped curved shape), and the combined travel of the slider 34 enables the second curved section to curve and the first curved section and the second curved section to combine to form a second curved shape (in this embodiment, an S-shaped curved shape). In the illustrated embodiment, after the sliding block 34 enters the coupling stroke, the sliding block 34 will drive the first traction wire 81 to act, and at the same time, the transmission input member 51 is coupled through the connection structure, and the driven bevel gear 54 will drive the second traction wire 82 to act.

In some other embodiments, the coupling between the slider 34 as the transmission output of the first traction unit 30 and the transmission input 51 of the second traction unit 50 may also be by other forms of interfacing structures. For example, referring to fig. 12 and 13, the docking structure is in the form of a cam, and includes a spiral guide groove 62 provided on the slider 34, and further includes a guide pin 61 provided on the other of the transmission levers, the guide pin 61 being for guiding engagement with the guide groove 62 to convert the guided movement of the slider 34 into rotation of the transmission input member 51. For another example, the guiding movement of the slider 34 may be converted into the rotation of the transmission input member 51 by a crank slider mechanism or a rack and pinion mechanism. In some other embodiments, the traction wire driving member of the second traction unit 50 may be in other forms, for example, when the guiding movement of the sliding block 34 is converted into the rotation of the transmission input member 51 by a rack-and-pinion mechanism, the traction wire driving member may correspondingly use a cylindrical gear, and in addition, the traction wire driving member may also use a disc, and the disc may implement the rotation by using other transmission structures on the rotating shaft. Of course, the second traction unit can also be replaced by other existing structural forms, so that the transmission input piece can be connected with the sliding block.

In one embodiment, the following implementation manner is adopted for driving the second traction wire 82 by the driven bevel gear 54: referring to fig. 4 and 7, the proximal end of the second traction wire 82 is fixed to the main body 11 of the control handle 10 by a fixing pin 72, and each end surface of the driven bevel gear 54 is provided with a protrusion 55, specifically, the protrusion 55 may have a cylindrical structure; the protruding portions 55 are arranged in pairs, and the protruding portions 55 are used for poking the second traction wire 82 with the fixed end when the driven bevel gear 54 rotates in the first direction to tension the second traction wire 82, and releasing the second traction wire 82 when the driven bevel gear 54 rotates in the opposite direction to relax the second traction wire 82. In one embodiment, the two protruding portions 55 on the end surface of the driven bevel gear 54 are located at two sides of the rotation center of the driven bevel gear 54, and are symmetrically arranged with respect to the rotation center of the driven bevel gear 54, so that the second traction wire 82 is wound in an S-shape. Since the convex portion 55 is provided on the end surface of the driven bevel gear 54 where the gear shaft is provided in the above-described embodiment, the second traction wire 82 is wound around the gear shaft at the same time, and the second traction wire 82 can slip along the outer peripheral surface of the gear shaft when the driven bevel gear 54 rotates. Of course, the second traction wire 82 can be formed in a more standard S-shape when the convex portion and the gear shaft are located at different side end surfaces of the driven bevel gear 54. In some other embodiments, the protrusion 55 on the end surface of the same driven bevel gear 54 may be provided only at one position, and the protrusion 55 may be pressed against the second traction wire 82 when the driven bevel gear 54 rotates in one direction, so that the second traction wire 82 is tightened, and the protrusion 55 may be separated from the second traction wire 82 when the driven bevel gear 54 rotates in the opposite direction, so that the second traction wire 82 is loosened. The second traction wire 82 is wound in an S-shape, which is advantageous in reducing the requirement for the rotation angle of the driven bevel gear 54. Referring to fig. 9, when the driving bevel gear 53 rotates, the rotation directions of the two driven bevel gears 54 are opposite, so that the winding modes of the two second traction wires 82 on the two driven bevel gears 54 are the same, and thus when the two driven bevel gears 54 rotate simultaneously, the two second traction wires 82 can realize tightness.

In one embodiment, referring to fig. 10, the driven bevel gear 54 is movably disposed in an axial direction, and the driven bevel gear 54 movably disposed in the axial direction has a coupling position to be coupled with the drive bevel gear 53 and a decoupling position to be separated from the drive bevel gear 53 on a moving path. In one embodiment, axial movement of the driven bevel gear 54 may be accomplished by a spring button that is pressed once, the driven bevel gear 54 is moved to the engaged position and held, and the spring button is pressed once again, the driven bevel gear 54 is moved to the disengaged position and held. The spring button is a relatively mature structure which is applied at present, and the gear shaft of the driven bevel gear 54 is used as a pressing movable part of the spring button, and will not be described in detail here. Of course, the axial movement of the driven bevel gear 54 may be achieved by other means, for example, the driven bevel gear 54 is rotatably assembled to a gear mounting seat, and then the gear mounting seat is movably assembled to the main body 11 along the axial direction of the driven bevel gear 54, and after the gear mounting seat is adjusted in place, the gear mounting seat is fixed by means of locking by clasping, locking by a set screw, or the like.

When the drive member 40 is rotated in the forward direction, the slider 34 of the first traction unit 30 is moved proximally, and the first bending section 21 of the sheath is bent towards the first side under the control of a first traction wire 81 (see fig. 11); the knob is continuously rotated clockwise, after the sliding block 34 is meshed with the transmission input piece 51 of the second traction unit 50, the driving bevel gear 53 is driven to rotate, the two driven bevel gears 54 are further driven to rotate, the two second traction wires 82 corresponding to the two driven bevel gears 54 are respectively loosened and tightened, the second bending section 22 of the head end of the traction sheath tube is reversely bent towards the second side, and the head end of the sheath tube forms an S-shaped bending shape which can be changed along with the rotation stroke of the driving knob. The first traction unit 30 and the second traction unit 50 have the following driving sequence according to the rotational stroke of the driving part 40: first traction unit 30→first traction unit 30+second traction unit 50.

Conversely, when the drive member 40 is rotated in the opposite direction, the slider 34 of the first traction unit 30 moves distally, the second traction unit 50 controls the second traction wire 82 to reset, and the second curved section 22 of the sheath resumes its flatness; the drive knob continues to rotate in the opposite direction, the slide 34 is disengaged from the transmission input 51 of the second traction unit 50, and the first curved section 21 of the sheath is then restored to a flat state; the driving knob continues to rotate reversely, and the sliding block 34 of the first traction unit 30 drives the first bending section 21 to bend reversely to the other side in a J shape.

It should be noted that, the above "forward rotation" and "reverse rotation" refer to two opposite rotation directions, and do not refer to a direction as a forward direction or a reverse direction, and any direction may be defined as a forward direction. If the rotational travel of the drive knob corresponds only to an independent travel of the slider 34, i.e. until the slider 34 is engaged with the drive input 51, the sheath tip may form a degree of J-bend shape towards the first side or the second side by means of the first bend section 21; if the rotational travel of the drive knob corresponds to the independent and combined travel of the slider 34, the sheath tip may form an S-shaped bend to the first side by virtue of the first and

second bending sections

21, 22.

If two second traction wires 82 are wound around the driven bevel gears 54 in opposite manner, when the two driven bevel gears 54 are simultaneously rotated, the two second traction wires 82 can be simultaneously loosened or tightened, and at this time, one driven bevel gear 54 can be moved to a side away from the transmission input member 51, i.e., to the disengaged position, and the corresponding driven bevel gear 54 is disconnected from the drive bevel gear 53 and the transmission input member 51, so that the transmission connection of only one driven bevel gear 54 remains. This arrangement allows for selective adjustment of the bending direction of the second bending section 22 of the sheath tip. When both driven bevel gears 54 move to a side away from the transmission input member 51, i.e., to the disengaged position, both driven bevel gears 54 are disconnected from the drive bevel gear 53 and the transmission rod, and the direction of the first curved section 21 can be independently controlled. In addition, in some other embodiments, the first bending section 21 and the second bending section 22 may also be controlled by bending only one traction wire, respectively, in which case the first bending section 21 and the second bending section 22 are reset by elastic structure when the traction wires are relaxed.

In some other embodiments, the proximal end of the second traction wire 82 may also be directly secured to the gear shaft of the driven bevel gear 54, with the unwinding length of the second traction wire 82 being varied by virtue of the winding of the gear shaft to effect the tightening of the second traction wire 82.

In some other embodiments, the traction wire driving member may be replaced by other forms, for example, only one driven bevel gear 54 is provided, please refer to fig. 14, two pairs of protrusions 55 are provided on the end surface of the driven bevel gear 54, and two pairs of protrusions 55 are provided for respectively winding two second traction wires 82. One of the second traction wires 82 is shown by a solid line and the other second traction wire 82 is shown by a two-dot chain line. In this winding manner, although individual control cannot be achieved by moving the driven bevel gear 54, the number of parts can be reduced, and the structure is simpler.

Through setting up first traction unit 30 and second traction unit 50 that separate each other to set up the structure of plugging into between the slider 34 of first traction unit 30 and the transmission input piece 51 of second traction unit 50, can rely on first traction unit 30 to realize the control to first bending section 21, can rely on second traction unit 50 to realize the control to second bending section 22 again, thereby realize more crooked forms, satisfy more crooked control demands, convenient operation, and the sheath pipe also obtains guaranteeing easily with the location axiality between the pipe that passes through.

An embodiment of the bending control device of the present invention:

the structure of the bending control device is the same as that of the bending control device (i.e., the control handle 10) in any of the above-described embodiments of the adjustable bending sheath, and will not be described again here. It should be noted that in some other embodiments, the bending control device may be used with other types of instruments other than a sheath, such as an endoscope.

The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.

Claims

1. A bending control device, comprising:

a main body;

2. The flexure control apparatus of claim 1 wherein the drive input is a drive rod rotatably mounted to the body, the interface structure is a threaded drive structure, the interface structure includes a helical tooth disposed on one of the slider and the drive rod, and further includes a helical groove disposed on the other of the slider and the drive rod, the helical tooth being in threaded drive engagement with the helical groove.

3. A bending control device according to claim 1, wherein the drive input is a drive rod rotatably mounted to the body, the docking structure being in the form of a cam, the docking structure including a helical guide slot provided on one of the slider and the drive rod, and a guide pin provided on the other of the slider and the drive rod, the guide pin being for guided engagement with the guide slot.

4. A bending control device according to any one of claims 1 to 3, wherein the second traction unit is provided on a side of the slider remote from the threaded rod, the slider being coupled to the drive input by the docking structure during movement of the slider towards the second traction unit.

5. A bending control device according to any one of claims 1 to 3, wherein the bending control device comprises a diverting pulley rotatably mounted on the body with its axis of rotation perpendicular to the direction of guiding movement of the slider; the reversing pulley is used for winding one of the first traction wires to realize reversing.

6. A bending control device according to any one of claims 1 to 3, wherein the traction wire drive member is a rotating member rotatably mounted on the main body, the traction wire drive member having end surfaces on both sides of its own rotation axis and parallel to the guiding direction of the slider, the end surfaces being provided with protrusions for pulling a second traction wire with its end fixed to achieve tensioning of the second traction wire when the traction wire drive member is rotated in a first direction and releasing the second traction wire to achieve releasing of the second traction wire when the traction wire drive member is rotated in a reverse direction.

7. The bending control device according to claim 6, wherein at least one pair of protrusions is provided on an end surface of the traction wire driving member, and the pair of protrusions are located on both sides of a rotation center of the traction wire driving member, so that the second traction wire is wound in an S-shape.

8. The bending control device according to claim 7, wherein the traction wire driving member is provided with one portion, the protruding portions are provided with two pairs, and the two pairs of protruding portions are provided for respectively winding the two second traction wires.

9. The bending control device according to claim 6, wherein the drive bevel gear is provided on the transmission input member, the traction wire driving member is a driven bevel gear which is adapted to the drive bevel gear, the driven bevel gear is provided with two parts, and the two parts of the driven bevel gear are respectively used for driving one of the second traction wires; at least one driven bevel gear is movably arranged along the axial direction, and the driven bevel gear which is movably arranged along the axial direction is provided with a combination position meshed with the driving bevel gear and a disconnection position separated from the driving bevel gear on a movable path.

10. An adjustable bend sheath comprising:

and a control handle which is the bending control device according to any one of claims 1 to 9.