CN213158817U - Composite catheter assembly - Google Patents

Abstract

The utility model discloses a composite catheter assembly, which comprises a balloon catheter and a guide wire, wherein the guide wire is assembled in a central lumen of the balloon catheter and can move relative to the balloon catheter in the central lumen, and the movement of the guide wire is controlled by a guide wire control device at the tail end of the balloon catheter, wherein the guide wire control device comprises an angle knob, a pushing control assembly and a guide wire twister; the guide wire twister is used for locking the guide wire and controlling the guide wire to rotate around a shaft and advance or retreat; the axial advancing or retreating distance of the guide wire is controlled by the pushing control assembly and is shown by a first scale; the rotating angle of the guide wire can be controlled by an angle knob and is shown by a second scale; the guide wire is provided with a force sensing assembly, and the force sensing assembly is used for sensing and displaying the resistance borne by the front end of the guide wire in the advancing process of the guide wire. The utility model discloses make the operation of apparatus become simpler, operation operating time shortens, and makes the relative position control of sacculus pipe and seal wire more accurate.

Description

Composite catheter assembly

Technical Field

The utility model relates to the field of medical equipment, more specifically relates to a compound tubing assembly.

Background

Existing balloon dilation catheters often consist of a proximal hypotube, a catheter hub and a distal tip, a balloon, a visualization ring, an inner tube, an outer tube, side holes (guidewire ports), etc. The proximal catheter hub has a threaded luer fitting with a pressurizing port for pressurizing the balloon, as shown in fig. 1.

Existing balloon dilatation catheters are often used to reach the diseased site with the help of an elongated flexible guide wire; usually, the guide wire is operated to reach the lesion site by itself, and then the catheter is guided along the guide wire to reach the lesion site, which is complicated to operate, as shown in fig. 2.

Therefore, there is still a lack in the art of a composite catheter assembly for integrating a guide wire and a balloon catheter together, so that the operation of the instrument becomes simpler and the operation time of the operation becomes shorter.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound catheter subassembly, the utility model discloses a catheter subassembly is integrated balloon catheter and seal wire together, by many people before grip become now alone grip can, this design makes the operation of apparatus become simpler, and operation operating time shortens, and makes the relative position control of balloon catheter and seal wire more accurate.

The utility model provides a compound catheter assembly, specifically, this catheter assembly includes sacculus pipe and seal wire, the seal wire assemble in the central lumen of sacculus pipe, and can move for the sacculus pipe in the central lumen, the motion of seal wire is controlled through the seal wire controlling means of sacculus pipe end, wherein, the seal wire controlling means includes angle knob, propelling movement control assembly and seal wire twister; the guide wire twister is used for locking the guide wire and controlling the guide wire to rotate around a shaft and advance or retreat; the axial advancing or retreating distance of the guide wire is controlled by the pushing control assembly and is shown by a first scale; the rotating angle of the guide wire can be controlled through the angle knob and is shown through a second scale; the guide wire is provided with a force sensing assembly, and the force sensing assembly is used for sensing and displaying the resistance borne by the front end of the guide wire in the advancing process of the guide wire.

In another preferred embodiment, the force sensing assembly includes an outer coil, an inner guidewire core, a force sensing element, a force transmission line, and a pressure display device.

In another preferred embodiment, the outer spring coil is a hollow structure, and the guide wire inner core, the force sensing element and the force transmission line are disposed within the hollow lumen of the outer spring coil.

In another preferred embodiment, the guide wire inner core is of a long reducing structure, namely the outer diameter of the far section of the guide wire inner core is D1, the outer diameter of the middle section of the guide wire inner core is D2, and the outer diameter of the near section of the guide wire inner core is D3, wherein D2 is not less than D1 and not more than D3.

In another preferred embodiment, the outer diameters of the distal section and the proximal section of the guide wire inner core are constant, the intermediate section is a transition section, the outer diameter of the transition section is gradually changed, and the outer diameter of the intermediate section is gradually changed from D1 to D3 along the direction from the far to the near.

In another preferred embodiment, the force sensing element is disposed at the distal end of the guidewire inner core for sensing the resistance experienced by the guidewire during advancement thereof.

In another preferred example, one end of the force transmission line is connected with the force sensing element, and the other end of the force transmission line is connected with the pressure display device.

In another preferred example, the force transmission line extends out of the guide wire inner cavity at the tail part of the guide wire, extends outside the guide wire and is connected with the pressure display device.

In another preferred embodiment, the guide wire twister comprises a first part and a second part, the first part and the second part are connected through threads, and when the first part and the second part are assembled, the first part is compressed and pressed on the second part, so that the second part is deformed and the guide wire is clamped.

In another preferred embodiment, in the unassembled condition of the first and second sections, the width of the narrowest part of the cone inside the first section is L1, and the width of the narrowest part of the outwardly convex cone of the second section is L2, wherein L1 < L2.

It should be noted that the narrowest part of the cone inside the first portion is the smallest inner diameter part of the first portion, and the narrowest part of the outward convex cone of the second portion is the smallest inner diameter part of the second portion.

In another preferred example, an angle between the conical generatrix in the first part and the guide wire is alpha, and an angle between the convex conical generatrix in the second part and the guide wire is beta, wherein alpha < beta.

In another preferred embodiment, the angle knob is of a hollow structure, the angle knob is partially arranged around the proximal end of the holding handle of the balloon catheter, a plurality of angle fixing limiting grooves are circumferentially arranged on the inner side wall of the angle knob, an angle fixing limiting pin is arranged in the area of the holding handle opposite to the angle knob, and the angle fixing limiting pin can slide in and slide out of the angle fixing limiting grooves under the action of the elastic piece.

In another preferred embodiment, the angle fixing and limiting grooves are circumferentially and uniformly distributed, and the angle between every two adjacent angle fixing and limiting grooves is 5-120 degrees; preferably, 10 ° -90 °; more preferably, 20 to 60.

In another preferred embodiment, the elastic member is a spring.

In a further preferred embodiment, the angularly fixed limit pin is inserted into a radial bore of the grip handle, in which radial bore the angularly fixed limit pin can be moved radially by the spring.

In another preferred embodiment, the angle-fixing limit pin comprises a wide section and a narrow section, a first boss is formed at the joint of the wide section and the narrow section, the spring is sleeved outside the narrow section, the radial hole is provided with a second boss, and the spring is arranged between the first boss and the second boss.

In another preferred embodiment, the narrow section of the angle fixing limiting pin is radially fixed by the second boss, and the wide section of the angle fixing limiting pin is radially fixed by the radial hole.

In another preferred embodiment, when the angle knob rotates, the angle fixing limiting groove moves to the angle fixing limiting pin, the angle fixing limiting pin enters the angle fixing limiting groove, and the angle fixing limiting pin clamps the angle knob to stop rotating; and then the angle fixing limiting pin is withdrawn from the angle fixing limiting groove after increasing the force, the angle knob continues to rotate, the angle fixing limiting pin is not in the angle fixing limiting groove, and the angle fixing limiting pin does not block the rotation of the angle knob.

In another preferred example, the pushing control assembly comprises a first gear, a second gear, a third round wheel and a fourth round wheel;

the first gear and the second gear are gears with the same specification, are respectively arranged at two ends of the first scale and are connected through a chain, and an axial pointer is arranged on the chain and is used for indicating the advancing or retreating distance of the guide wire;

the second gear and the third round wheel are arranged concentrically, and the radius of the third round wheel is 2-10 times that of the second gear; preferably, 3-8 times; more preferably, 4 to 6 times;

the fourth round wheel and the third round wheel are arranged oppositely and form a conveying wheel set, the guide wire is conveyed between the third round wheel and the fourth round wheel, and the conveying length of the guide wire is consistent with the rotating length of the outer ring of the fourth round wheel and the outer ring of the third round wheel.

In another preferred example, static friction exists between the guide wire and the conveying wheel set.

In another preferred embodiment, the first gear, the second gear, the third round wheel and the fourth round wheel are all fixed with the angle knob into a whole.

In another preferred embodiment, the catheter assembly surface is coated with a coating.

In another preferred embodiment, the coating is a silicone oil coating or a hydrophilic coating.

In another preferred embodiment, the coating contains a drug.

In another preferred example, the first scale and/or the second scale are/is displayed in a digital display mode through a display screen.

In another preferred example, the first scale and/or the second scale are displayed by means of a mechanical pointer.

In another preferred example, the axial moving distance of the guide wire relative to the balloon catheter is 0-50 cm; more preferably, 0-40 cm; most preferably 0-30 cm.

In another preferred embodiment, the guide wire is rotated around the shaft clockwise or counterclockwise by an angle ranging from 0 to 180 °; more preferably, 0-120 °; most preferably 0-90.

The utility model discloses a main advantage includes:

(a) the operation is simpler;

(b) the operation time is shortened;

(c) the advancing speed and the advancing force of the guide wire can be effectively controlled through the force sensing assembly, and blood vessels or normal tissues are prevented from being damaged;

(d) the advancing distance and the rotating angle of the guide wire can be shown through the first scale and the second scale, so that the relative position control of the balloon catheter and the guide wire is more accurate;

(e) the structure of the duct assembly is simplified, the length of the product is reduced, and materials are saved.

It is understood that within the scope of the present invention, the above-mentioned technical features of the present invention and those specifically described below (e.g. in the examples) can be combined with each other to constitute new or preferred technical solutions. Not to be reiterated herein, but to the extent of space.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only 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 structural view of a balloon catheter of the prior art (with the balloon in a rolled-up state);

FIG. 2 is a schematic view of a prior art guidewire assembled with a balloon catheter;

fig. 3 is a schematic structural view of a balloon catheter in an example of the invention;

fig. 4 is a schematic view of the rear end of the unitary structure of the guidewire and balloon catheter in one example of the invention;

FIG. 5 is a cross-sectional view of FIG. 4;

fig. 6 is a cross-sectional view of a guidewire twister in one example of the invention;

FIG. 7 is a schematic view of a catheter assembly coated with a coating according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a guide wire according to an example of the present invention;

FIG. 9 is a cross-sectional view of FIG. 8;

fig. 10 is a schematic view of the inner tip of a guidewire according to an example of the present invention;

fig. 11 is a schematic view of the assembly of a guide wire and a guide wire twister according to an embodiment of the present invention;

fig. 12 is a schematic structural view of a plurality of angle fixing limiting grooves in the angle knob according to an embodiment of the present invention;

fig. 13 is a schematic structural view of an angle fixing limit pin according to an embodiment of the present invention;

FIG. 14 is a schematic view of the combination of the fixed angle limit slot of FIG. 12 and the fixed angle limit pin of FIG. 13;

FIG. 15 is a schematic view of the angularly fixed limit pin of FIG. 13 slid into the angularly fixed limit slot of FIG. 12;

FIG. 16 is a schematic view of a pusher control assembly (conveyor set engaged) according to another embodiment of the present invention;

fig. 17 is a schematic diagram of a push control assembly (with the conveyor wheel groups separated) according to another embodiment of the present invention;

fig. 18 is a schematic view of a fourth round wheel according to another embodiment of the present invention;

fig. 19 is a schematic view of the assembly of the first gear, the second gear and the third gear according to another embodiment of the present invention;

fig. 20 is a schematic view of the overall structure of a catheter assembly according to an example of the present invention;

fig. 21 is a schematic view of the assembly of a guide wire and a guide wire twister according to an embodiment of the present invention.

In the drawings, the designations are as follows:

1-balloon catheters;

2-guide wire;

3-holding the handle;

4-angle knob;

5-angle baseline;

6-first scale;

7-second scale;

8-a guide wire twister;

9-the first part;

10-a second part;

11-a coating region;

12-outer layer spring ring;

13-a guide wire inner core;

14-a force sensing element;

15-a force transmission line;

16-angle fixing limit groove;

17-angle fixing limit pin;

18-a spring;

19-a first gear;

20-a second gear;

21-a third round wheel;

22-a fourth circular wheel;

23-connecting rod outer sleeves;

24-a connecting rod spring;

25-connecting the inner rod of the rod;

26-a chain;

27-axial pointer.

Detailed Description

The inventor is through extensive and intensive research, through a large amount of screens, a compound tubing assembly has been developed for the first time, the utility model discloses a tubing assembly integrates sacculus pipe and seal wire together, specifically, there is a region of gripping at the afterbody of novel sacculus pipe, there is a cylindric chamber way in the inside in this region of gripping, novel seal wire gets into simultaneously with sacculus pipe when entering the human body, because there is the region of gripping, gripping that can be better during the operation for many people grip by before become present alone grip can, this design makes the operation of apparatus become simpler, operation operating time shortens greatly, and makes the relative position control of sacculus pipe and seal wire more accurate, accomplished on this basis the utility model discloses a catheter assembly.

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, the drawings are schematic and, thus, the present invention is not limited to the size or scale of the schematic.

It is to be noted that in the claims and the description of the present patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.

Example 1

As shown in fig. 3 and 4, the composite catheter assembly of the present embodiment integrates the balloon catheter 1 and the guide wire 2 together, so that the relative position control of the two is more precise, and the movement of the guide wire 2 is controlled by a guide wire 2 control device at the end of the balloon catheter 1, wherein the guide wire 2 control device comprises an angle knob 4, a pushing control assembly and a guide wire twister 8. The guide wire twister 8 is used for locking the guide wire 2 and controlling the guide wire 2 to rotate around a shaft and advance or retreat. The axial displacement may be indicated by a first scale 6 on the grip handle 3; the pivoting angle can be indicated by means of a second scale 7 on the angle knob 4.

As shown in fig. 4-6, the guide wire 2 is disposed in the central lumen of the balloon catheter 1 and is movable in the central lumen relative to the balloon catheter 1, and a guide wire twister 8 is provided at the proximal end of the guide wire 2, the guide wire twister 8 allowing the guide wire 2 to be better held and maneuvered by movement, and the guide wire 2 is steered to move axially or rotate axially around the guide wire 2. The guide wire twister 8 is a locking structure that is tightened by internal thread assembly to deform and thereby clamp the guide wire 2. Fig. 6 shows a state where the guide wire 2 is tightened by the guide wire twister 8, and fig. 11 and 21 show a state where the guide wire 2 is not tightened by the guide wire twister 8. The guide wire twister 8 comprises a first part 9 and a second part 10, wherein the wall thickness of the first part 9 is thick and is not easy to deform; the head end wall thickness of the convex cone of the second part 10 is thin and is easy to deform, and the wall thickness is thicker and is not easy to deform. The two parts are connected through screw threads, the second part 10 of the guide wire twister 8 at the connection part is inserted into the inner cavity of the first part 9 of the guide wire twister 8, and the two parts are screwed after the connection so that the inserted part of the second part 10 is deformed and compressed, thereby pressing and clamping the guide wire 2.

As shown in figure 21, in the unassembled condition of the first and second sections 9, 10, the width at the narrowest part of the cone inside the first section 9 is L1, the width at the narrowest part of the outwardly convex cone of the second section 10 is L2, and the width L2 is greater than the width L1. Wherein, the narrowest part of the cone inside the first part 9 refers to the position where the inner diameter of the first part 9 is the smallest, and the narrowest part of the convex cone of the second part 10 refers to the position where the inner diameter of the second part 10 is the smallest. When the front part and the rear part of the guide wire twister 8 are sleeved on the guide wire 2 and the two parts are screwed tightly through threads, because the width L2 is greater than the width L1, and the wall thickness of the head end of the outer convex cone at the rear part of the guide wire twister 8 is thinner and easy to deform, the head end of the outer convex cone at the rear part of the guide wire twister 8 is extruded to deform towards the side of the guide wire 2 so as to lock the guide wire 2. Preferably, as shown in fig. 11, the conical generatrix inside the first portion 9 forms an angle α with the guide wire 2, and the convex conical generatrix of the second portion 10 forms an angle β with the guide wire 2, where α < β.

The guide wire twister 8 and the angle knob 4 are assembled together, the guide wire 2 is controlled to rotate through the guide wire twister 8, so that the angle knob 4 is driven to rotate, and the rotating angle of the guide wire 2 can be known by reading the second scale 7 marked on the angle knob 4. Of course, based on the integral structure of the two, the guide wire 2 can be rotated by controlling the angle knob 4 arranged on the holding handle 3, and then the guide wire twister 8 is driven to rotate.

The angle knob 4 is a hollow structure, is sleeved outside the holding handle 3 of the balloon catheter 1, and is provided with corresponding angle scales (second scales 7) near the proximal end thereof to display the rotating angle degrees of the guide wire 2, as shown in fig. 4. When the angle knob 4 is rotated, the angle knob can be rotated not only within an expected rotation range, for example, the angle can be rotated by 0-180 degrees clockwise or counterclockwise; preferably, 0-120 °; more preferably, 0 to 90. An angle base line 5 is provided on the grip handle 3, and the angle base line 5 is used for indicating the rotation angle of the angle knob 4.

The angle knob 4 can be rotated to a certain angle and then fixed when rotating at a certain angle, as shown in fig. 12-15, the inner circle of the cross section of the angle knob 4 is provided with a plurality of angle fixing limiting grooves 16, the angle fixing limiting grooves 16 are circumferentially and uniformly distributed, and the angle between every two adjacent angle fixing limiting grooves 16 is 5-120 degrees; preferably, 10 ° -90 °; more preferably, 20 to 60. The holding handle 3 (overlapping the angle knob 4) has an angle fixing stopper 17, the angle fixing stopper 17 is embedded in a radial hole of the holding handle 3, and the radial hole of the holding handle 3 is in the overlapping area with the angle knob 4. There is also a spring 18 in the radial bore, the spring 18 allowing the angularly fixed stop pin 17 to move radially within the radial bore. The angle fixing limiting pin 17 comprises a wide section and a narrow section, the joint of the wide section and the narrow section forms a first boss, the spring 18 is sleeved outside the narrow section, a second boss is arranged in the radial hole, and the spring 18 is arranged between the first boss and the second boss. The narrow section of the angle fixing limiting pin 17 is radially fixed through the second boss, and the wide section of the angle fixing limiting pin 17 is radially fixed through the radial hole.

When the angle knob 4 rotates under the external pressure, the angle fixing limiting groove 16 moves to the angle fixing limiting pin 17, the angle fixing limiting pin 17 enters the angle fixing limiting groove 16, namely, the angle fixing limiting pin 17 moves away from the circle center in the radial direction, and the angle fixing limiting pin 17 clamps the angle knob 4 to stop rotating; and then the angle fixing limiting pin 17 is withdrawn from the angle fixing limiting groove 16 after increasing the force, the angle knob 4 continues to rotate, namely the angle fixing limiting pin 17 moves towards the circle center in the radial direction, the angle fixing limiting pin 17 is not in the angle fixing limiting groove 16, and the angle fixing limiting pin 17 does not block the rotation of the angle knob 4. Fig. 12 shows a case where the angle between the adjacent angle fixing and restricting grooves 16 is 30 °.

As shown in fig. 8-10, the guide wire 2 is provided with a force sensing assembly for sensing and displaying the resistance experienced by the leading end of the guide wire 2 during its advancement. The force sensing assembly includes an outer coil 12, a guidewire core 13, a force sensing element 14, a force transmission line 15, and a pressure display device (not shown). The outer spring ring 12 is of a hollow structure, the guide wire inner core 13, the force sensing element 14 and the force transmission line 15 are arranged in the hollow cavity of the outer spring ring 12, one end of the force transmission line 15 is connected with the force sensing element 14, the other end of the force transmission line 15 extends out of the inner cavity of the guide wire 2 at the tail part of the guide wire 2 and extends outside the guide wire 2 to be connected with a pressure display device. The assembled profile of the force sensing element 14 and the guide wire inner core 13 is smaller than the inner lumen diameter of the outer coil 12 of the guide wire 2.

The front end of the guide wire 2 (namely the far end of the guide wire 2) is provided with a front section force value induction area of the guide wire 2, and the front section force value induction area of the guide wire 2 is provided with a force induction element 14. Preferably, the force sensing element 14 is housed in a small section of the guidewire inner core 13, preferably in the rounded head of the guidewire 2.

When the seal wire 2 moves ahead in the blood vessel, can touch the barriers such as the blood vessel wall and thus produce a resistance to the seal wire 2 advance, force sensing element 14 senses this resistance and measures the power value of this resistance when producing the resistance, transmits the resistance that force sensing element 14 sensed through force transmission line 15 for the pressure display device outside the seal wire 2 body.

The resistance met by the guide wire 2 can be displayed in a display screen digital display mode, and the force sensing element 14 on the guide wire 2 can sense the force and reach the display screen through the conducting wire and display the force; the display of the resistance force may also be a mechanical force value display, where when there is resistance force on the guide wire 2, the mechanical pointer moves to display the force on the guide wire 2.

The guide wire inner core 13 is of a reducing structure, the outer diameter of the guide wire inner core 13 at the far end of the guide wire 2 is smaller, and the outer diameter of the guide wire inner core 13 is larger as the guide wire inner core is closer to the near end of the guide wire 2. The guide wire 2 can be divided into three parts, namely a front section (namely a far section), a middle section (a transition section) and a rear section (namely a near section), namely the outer diameter of the far section of the guide wire inner core 13 is D1, the outer diameter of the middle section is D2, and the outer diameter of the near section is D3, wherein D1 is not less than D2 and not more than D3. The anterior segment guide wire inner core 13 is a region with a smaller outer diameter, and the outer diameter of the region is constant; the middle section guide wire inner core 13 is a diameter gradual change area which is a transition section and gradually changes the diameter of the front section into the rear section; the rear section guide wire inner core 13 is a region with a larger outer diameter, the outer diameter of the region is also constant, and the outer diameter of the region is close to the inner diameter of the inner cavity of the outer spring ring 12 of the guide wire 2.

The guide wire 2 is replaceable and can be replaced by the guide wire 2 with different hardness according to the requirement. Such as softer durometer, moderately harder durometer, etc. When the guide wire 2 needs to be replaced, the guide wire twister 8 at the tail part of the catheter seat is in a unscrewing state, then the guide wire 2 is taken out and replaced by the guide wire 2 with required hardness, and then the replaced guide wire 2 is axially moved or axially rotated or locked according to the requirement.

As shown in fig. 7, the composite catheter assembly of the present embodiment may be coated with a coating layer to form a coated region. The coated region 11 in this embodiment is the region outside the catheter hub. The coating may also be applied over the entire area. The coating can be silicone oil or a hydrophilic coating, so that the friction coefficient of the outer tube is reduced, the resistance is reduced, the friction force is small when the outer tube is in contact with the human body cavity, the trafficability of the catheter is enhanced, and the injury of the catheter to the human body cavity tissue (such as mucosa, blood vessel inner wall and the like) is reduced. The coating may also be a drug, such as paclitaxel or rapamycin, which is released from the catheter and absorbed by the blood vessel to reduce restenosis of the vessel lumen after dilation. The coating may also be coated with a pharmaceutical heparin to prevent clotting.

The guide wire 2 can perform linear motion (advance and retreat) along the axial direction, and the moving distance of the guide wire 2 relative to the balloon catheter 1 is 0-50cm during the linear motion; preferably, 0-40 cm; more preferably, 0-30 cm. This linear movement is controlled by a push control assembly, which in this embodiment is a guide wire twister 8, and the distance of axial advancement or retraction of the guide wire 2 is indicated by a first scale 6, as shown in fig. 4.

Example 2

The composite catheter assembly of the present embodiment is similar to embodiment 1, except that the distance that the guide wire 2 can be axially advanced or retracted can be proportionally shown by the push control assembly, for example, the guide wire 2 is axially advanced or retracted by 1 meter, and the scale value on the first scale 6 is advanced or retracted by 20 cm. As shown in fig. 16-20, the push control assembly of the present embodiment includes a first gear 19, a second gear 20, a third circular wheel 21, and a fourth circular wheel 22. The first gear 19 and the second gear 20 are gears with the same specification, are respectively arranged at two ends of the first scale 6, and are connected through a chain 26 (or a toothed belt, etc.), and an axial pointer 27 is arranged on the chain 26 and is used for indicating the distance of the guide wire 2 moving forward or backward. The second gear 20 and the third round gear 21 are concentrically arranged, and the radius of the third round gear 21 is 2-10 times of that of the second gear 20; preferably, 3-8 times; more preferably, 4 to 6 times. The fourth round wheel 22 and the third round wheel 21 are arranged oppositely and form a conveying wheel set, the guide wire 2 is conveyed between the third round wheel 21 and the fourth round wheel 22, and the conveying length of the guide wire 2 is consistent with the rotating length of the outer rings of the fourth round wheel 22 and the third round wheel 21. The first gear 19, the second gear 20, the third round wheel 21 and the fourth round wheel 22 are all fixed with the angle knob 4 into a whole.

The first gear 19 is connected with the second gear 20 through a gear connecting rod, two gears (the first gear 19 and the second gear 20) connected with the gear connecting rod are connected with the gear connecting rod through pins which are fixed on the gear connecting rod, the two gears (the first gear 19 and the second gear 20) can rotate around the pins, the chain 26 is in a tensioning state due to the support of the gear connecting rod, and the gear connecting rod is fixed on the angle knob 4 through pins or screws and the like; an axial pointer 27 (or a displacement ring and the like) is fixed on the chain 26, and the chain 26 drives the axial pointer 27 to move; the axial pointer 27 is located eccentrically in the inner cavity of the grip handle 3, together with the chain 26, the gear connection rod, etc.

The fourth round wheel 22 is connected with the angle knob 4 through a connecting rod; the connecting rod comprises a connecting rod outer sleeve 23, a connecting rod spring 24 and a connecting rod inner rod 25.

The connecting rod is relatively unfixed with the angle knob 4, and the fourth round wheel 22 is also relatively unfixed with the connecting rod. The connecting rod is connected with the angle knob 4 through a pin, the pin is fixed on the connecting rod, and the connecting rod can rotate around the pin. The connecting rod is connected to the fourth circular wheel 22 by means of another pin, which is fixed to the fourth circular wheel 22, and around which the connecting rod can rotate.

A gap is formed between the connecting rod outer sleeve 23 and the connecting rod inner rod 25, the connecting rod spring 24 is embedded in the gap, and the connecting rod spring 24 is always in a compressed state. When no other external force is applied, the compressed connecting rod spring 24 has reverse elastic force to make the fourth round wheel 22 tightly attached to the third round wheel 21. When the external force is applied, the fourth round wheel 22 continues to move downwards, so that the two round wheels (the third round wheel 21 and the fourth round wheel 22) of the conveying wheel set are separated.

As mentioned above, the fourth circular wheel 22 is connected to the angle knob 4, the gear connecting rod is fixed to the angle knob 4, the first gear 19 and the second gear 20 are also connected to the gear connecting rod and sleeved with the chain 26, and the chain 26 is fixed with the axial pointer 27. The fourth circular wheel 22, the gear connecting rod, the first gear 19, the second gear 20, the chain 26, the axial pointer 27, the third gear and the angle knob 4 are all integrated and can rotate along with the rotation of the angle knob 4.

As shown in fig. 19, the third round wheel 21 and the fourth round wheel 22 are rotatable, and when the third round wheel 21 rotates clockwise, the chain 26 is moved, and the chain 26 drives the axial pointer 27 to move to the right. Rotating the third circular wheel 21 causes the axial pointer 27 to be in the position of the "0" scale of the position scale of the guide wire 2.

The two round wheels (the third round wheel 21 and the fourth round wheel 22) of the conveying wheel set can be separated under the action of external force, and the guide wire 2 enters the holding handle 3 from the middle of the two separated round wheels in a separated state, reaches the inner cavity of the catheter and finally extends out of the head end of the balloon catheter 1; when the guide wire 2 extends out of the head end of the balloon catheter 1 to the required length, the external force is removed, the two round wheels are tightly attached, the guide wire 2 is clamped, the position where the guide wire 2 is clamped by the two round wheels is the original position of the guide wire 2, and the scale of the position of the guide wire 2 shows '0'. Preferably, the outer lane of two circle wheels adopts materials such as silica gel (if adopt structures such as silica gel cover) to reach the effect of increase frictional force, make the distance of advance of seal wire 2 and the turning distance of third circle wheel 21 (or fourth circle wheel 22) equal, can not take place to skid etc. thereby influence the display accuracy of second scale 7, this kind of design also can not cause the damage of seal wire 2 because the extrusion force is too big simultaneously. The third round wheel 21 is rotated clockwise to drive the guide wire 2 to advance, the second gear 20 drives the chain 26 to move, the chain 26 drives the axial pointer 27 to move, and the scale value of the axial pointer 27 pointing to the second scale 7 (i.e. the scale of the position of the guide wire 2) is the moving distance of the guide wire 2. In another preferred embodiment, the grip handle 3 is a transparent injection-molded part, the surface of the transparent grip handle 3 is provided with the opaque second scale 7, and the inner axial pointer 27 is also opaque, so that the operator can more clearly observe the advancing distance of the guide wire 2.

The conveying wheel group drives the guide wire 2 to move, and the arc lengths corresponding to the rotation of the third round wheel 21 and the fourth round wheel 22 are equal to the moving distance of the guide wire 2. As described above, the radius of the third circular gear 21 is multiplied by the radius of the second gear 20. The second gear 20 follows the third circular wheel 21, the first gear 19 and the second gear 20 drive the chain 26 to move, and the chain 26 drives the axial pointer 27 to move. The distance of advance or retreat of the guide wire 2 is multiplied by the distance of advance or retreat of the axial pointer 27 and is equal to the ratio of the radius of the third circular wheel 21 to the radius of the second circular wheel 20. The scale value of the second scale 7 is a value obtained by multiplying the real movement distance of the axial pointer 27 by the radius ratio of the third circular wheel 21 to the second gear 20, that is, the real movement distance of the guide wire 2.

For example, if the diameter of the third circular wheel 21 is 5 times the diameter of the second gear 20, the moving distance of the pointer is 1/5 times the real moving distance of the guide wire 2, and the second scale 7 is marked as a scale value for enlarging the moving distance value of the pointer by 5 times, the second scale 7 indicates the scale value of the real moving distance of the guide wire 2. Therefore, the length of the holding handle 3 can be made shorter while the holding handle 3 indicates the axial displacement of the guide wire 2, the length of a product is reduced, and the product is convenient to operate.

During operation, the conveying wheel set can clamp the guide wire 2 in a tightly attached state, the angle knob 4 is rotated, the angle knob 4 drives the conveying wheel set to rotate, and the two tightly attached round wheels drive the guide wire 2 clamped by the round wheels to rotate. Therefore, the rotation angle knob 4 finally drives the guide wire 2 to rotate, and the rotation angle of the angle knob 4 is the rotation angle of the guide wire 2.

All documents mentioned in this application are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

Claims (10)

1. A composite catheter assembly comprising a balloon catheter and a guide wire assembled in a central lumen of the balloon catheter and movable therein relative to the balloon catheter, the movement of the guide wire being controlled by a guide wire control device at a tip of the balloon catheter,

the guide wire control device comprises an angle knob, a pushing control assembly and a guide wire twister;

the guide wire twister is used for locking the guide wire and controlling the guide wire to rotate around a shaft and advance or retreat;

the axial advancing or retreating distance of the guide wire is controlled by the pushing control assembly and is shown by a first scale;

the rotating angle of the guide wire can be controlled through the angle knob and is shown through a second scale;

the guide wire is provided with a force sensing assembly, and the force sensing assembly is used for sensing and displaying the resistance borne by the front end of the guide wire in the advancing process of the guide wire.

2. The catheter assembly of claim 1, wherein the force sensing assembly comprises an outer coil, an inner guidewire core, a force sensing element, a force transmission line, and a pressure display device.

3. The catheter assembly of claim 2, wherein the force sensing element is disposed at a distal end of the guidewire inner core for sensing resistance experienced by a leading end of the guidewire during advancement thereof.

4. The catheter assembly of claim 1, wherein the guidewire twister comprises a first portion and a second portion, the first portion and the second portion being threadably connected, wherein upon assembly of the first portion and the second portion, the first portion compresses the second portion causing the second portion to deform and grip the guidewire.

5. The catheter assembly of claim 4, wherein the width of the narrowest part of the cone inside the first part is L1 and the width of the narrowest part of the outer convex cone of the second part is L2, wherein L1 < L2, in the unassembled condition of the first part and the second part.

6. The catheter assembly of claim 1, wherein the angle knob is a hollow structure, the angle knob is partially disposed around a proximal end of a grip handle of the balloon catheter, a plurality of angle fixing limiting grooves are circumferentially disposed on an inner side wall of the angle knob, and an angle fixing limiting pin is disposed on a region of the grip handle opposite to the angle knob, and the angle fixing limiting pin can slide in and out of the angle fixing limiting grooves under the action of the elastic member.

7. The catheter assembly of claim 6, wherein the angularly fixed retention slots are circumferentially evenly distributed, and the angle between adjacent angularly fixed retention slots is between 5 ° and 120 °.

8. The catheter assembly of claim 1, wherein the advancement control assembly comprises a first gear, a second gear, a third circular wheel, and a fourth circular wheel;

the first gear and the second gear are gears with the same specification, are respectively arranged at two ends of the first scale and are connected through a chain, and an axial pointer is arranged on the chain and is used for indicating the advancing or retreating distance of the guide wire;

the second gear and the third round wheel are arranged concentrically, and the radius of the third round wheel is 2-10 times that of the second gear;

the fourth round wheel and the third round wheel are arranged oppositely and form a conveying wheel set, the guide wire is conveyed between the third round wheel and the fourth round wheel, and the conveying length of the guide wire is consistent with the rotating length of the outer ring of the fourth round wheel and the outer ring of the third round wheel.

9. The catheter assembly of claim 8, wherein the first gear, the second gear, the third circular wheel, and the fourth circular wheel are each integrally fixed with the angle knob.

10. The catheter assembly of claim 1, wherein the catheter assembly surface is coated with a coating.

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