Handle and medical catheter device

Abstract

According to the handle and the medical catheter device, when the bent shape of the far end of the catheter is controlled through the bending fixing structure and the friction resistance piece, the control force at the handle can be gradually increased along with the bending control angle when small-angle bending control is adjusted to large-angle bending control, and the control hand feeling of an operator is improved; the bending auxiliary part is arranged in the guide pipe, the bending control radius of the adjustable bending section of the guide pipe can be changed by controlling the bending auxiliary part to move, and therefore the bending control radius can be adjusted under the condition that the guide pipe is not replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a handle and a medical catheter device. Background Art

[0002] A radiofrequency ablation catheter is a medical device commonly used to treat heart diseases, especially arrhythmias. It creates a controllable lesion or scar tissue at the target tissue through the radiofrequency energy transmitted by the distal electrode to repair the electrical activity of the heart and restore the normal heart rhythm.

[0003] Radiofrequency ablation catheters are usually slender and flexible tubular devices that pass through blood vessels, such as the femoral artery or femoral vein, and then are guided to the heart. They have different lengths and functional designs to adapt to different clinical applications. The distal electrode is small in volume to be able to transmit energy to the greatest extent and damage the surrounding tissue to the least extent. The temperature sensor built into the ablation electrode can monitor the electrode temperature in real time. To improve the safety and maneuverability of radiofrequency ablation surgery, radiofrequency ablation catheters have added functions such as an internal cooling system, a pressure sensing system, and magnetic positioning.

[0004] Traditional radiofrequency ablation catheters rely on the operator to push and pull the handle knob and the core rod to drive the wire inside the catheter body through a certain stroke to form a specific bend at the distal end of the catheter. The bending control force intuitively felt by the operator includes not only the reaction force that needs to be overcome for the tubing itself to bend, but also the frictional force generated at the handle end to achieve a fixed bend. For traditional radiofrequency ablation catheters to keep the catheter bend unchanged during the operation when achieving the maximum angle of bending control, the frictional force at the handle is often set to be greater than the reaction force of the tubing when adjusting the bendable section to the maximum angle, and the frictional force at the handle does not decrease as the bending angle decreases, which will lead to a heavy feeling in catheter manipulation and thus negative feedback from the operator.

[0005] There may be differences between the preoperative CTA (CT Angiography) results and the intraoperative angiography results, and there is a risk of misusing the catheter bend. This situation will lead to catheter replacement during the operation, greatly increasing the surgical cost. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a handle and a medical catheter device to solve one or more problems existing in the prior art.

[0007] To solve the above problems, the utility model provides a handle for controlling the bend of the distal end of the catheter. The handle includes: a bending control knob, a core rod, a housing, a fixed bending structure, and a frictional resistance structure;

[0008] The bending control push button is used to be fixed to the proximal end of the catheter. The distal end of the core rod is fixedly connected to the proximal end of the bending control push button. The proximal end of the core rod extends into the housing, and the core rod is connected to the distal end of the catheter through a wire. The bending control push button drives the core rod to drive the wire to move by moving relative to the housing, so as to change the bending of the distal end of the catheter.

[0009] The fixed bending structure is fixed to the proximal end of the housing and is arranged outside the core rod. The friction resistance structure is arranged between the fixed bending structure and the core rod. The friction resistance structure can undergo elastic deformation, and the elastic deformation amount of the friction resistance structure changes as relative movement occurs between the fixed bending structure and the core rod, so that different magnitudes of frictional forces can be generated between the friction resistance structure and the fixed bending structure and the core rod.

[0010] Optionally, in the handle, the fixed bending structure includes a first fixed bending structure, and the friction resistance structure includes a first friction resistance member. The first fixed bending structure is sleeved outside the core rod, and there is a gap between the first fixed bending structure and the core rod. The gap gradually decreases as the core rod moves away from the housing, so that the elastic deformation amount of the first friction resistance member gradually increases, thereby making the frictional force between the first friction resistance member and the first fixed bending structure and the core rod gradually increase.

[0011] Optionally, in the handle, the core rod has a tapered section, and the first fixed bending structure is sleeved outside the tapered section. The outer diameter of the tapered section gradually decreases from the proximal end to the distal end.

[0012] Optionally, in the handle, the included angle a between the generatrix of the tapered section and the axis is 0.02° - 15°, and the tapered travel of the tapered section is 3 mm - 150 mm.

[0013] Optionally, in the handle, the core rod has a tapered sliding groove extending in a direction parallel to the axis.

[0014] The fixed bending structure includes a second fixed bending structure and a second friction resistance member. A part of the second fixed bending structure extends into the tapered sliding groove and is movably arranged along the extending direction of the tapered sliding groove. The second friction resistance member is arranged in the tapered sliding groove and moves as the second fixed bending structure moves.

[0015] The depth of the tapered sliding groove gradually decreases from the distal end to the proximal end, so that when the second fixed bending structure moves toward the proximal end or the core rod moves away from the housing, the elastic deformation amount of the second friction resistance member gradually increases, thereby making the frictional force between the second friction resistance member and the second fixed bending structure and the core rod gradually increase.

[0016] The present utility model further provides a medical catheter device, comprising: a catheter and a handle as described in any one of the preceding items;

[0017] The catheter includes a main body section, an adjustable bending section, and a head section. The main body section, the adjustable bending section, and the head section are connected in sequence from proximal to distal. The bending control knob is fixed to the proximal end of the main body section, and the core rod is connected to the adjustable bending section through a wire.

[0018] Optionally, in the medical catheter device, it further includes: a bending auxiliary member,

[0019] The bending auxiliary member extends from inside the handle through the main body section and into the adjustable bending section. The bending auxiliary member is axially movably arranged, and by moving, its length inside the adjustable bending section is changed to change the controllable bending length of the adjustable bending section.

[0020] Optionally, in the medical catheter device, both the main body section and the adjustable bending section include an inner tube and an outer tube sleeved on the inner tube. There is a space between the outer tube and the inner tube, and the bending auxiliary member is arranged around the inner tube in the space between the inner tube and the outer tube.

[0021] Optionally, in the medical catheter device, the bending auxiliary member is a single - cavity tubular structure or a braided tube structure that can provide support for the main body section.

[0022] Optionally, in the medical catheter device, the outer side wall of the inner tube, the inner side wall of the outer tube, and / or the inner and outer surfaces of the bending auxiliary member have lubricating coatings.

[0023] Optionally, in the medical catheter device, a wire cavity for the wire to pass through and a bending auxiliary member cavity for the bending auxiliary member to pass through are provided inside both the main body section and the adjustable bending section. The bending auxiliary member cavity and the wire cavity are located on opposite sides of the axis, and the axis is the axis of the main body section and the adjustable bending section.

[0024] Optionally, in the medical catheter device, the bending auxiliary member is a tubular member, and the inner cavity of the tubular member forms a channel for the wire to pass through.

[0025] Optionally, in the medical catheter device, the tubular member is a metal tube, a coiled tube, a hypotube, or a braided tube.

[0026] Optionally, in the medical catheter device, the bending auxiliary member is provided with a position adjustment track whose length is consistent with its own stroke;

[0027] The handle further includes a bent adjusting gear, which cooperates with the position adjusting track and drives the bent auxiliary member to move axially by rotation. The core rod includes a distal segment having a gear groove, and the bent adjusting gear is arranged in the gear groove in cooperation with the position adjusting track.

[0028] In summary, when the handle provided by the present utility model uses the fixed bending structure and the friction resistance member to control the bending of the distal end of the catheter, it can achieve that the control force at the handle gradually increases with the increase of the bending angle when adjusting from a small-angle bending to a large-angle bending, improving the operator's handling feel.

[0029] In addition, in the medical catheter device provided by the present utility model, by arranging a bent auxiliary member in the catheter and controlling the movement of the bent auxiliary member, the bending radius of the adjustable bending section of the catheter can be changed, so that the adjustment of the bending radius can be achieved without replacing the catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Those of ordinary skill in the art will understand that the provided drawings are used to better understand the present utility model and do not constitute any limitation to the scope of the present utility model, where:

[0031] Figure 1 is an overall structural schematic diagram of a medical catheter in an embodiment of the present utility model;

[0032] Figure 2 is a comparison schematic diagram of different bending radii of the medical catheter in an embodiment of the present utility model;

[0033] Figure 3 is a first setting method schematic diagram of the bent auxiliary member in an embodiment of the present utility model;

[0034] Figure 4 is a second setting method schematic diagram of the bent auxiliary member in an embodiment of the present utility model;

[0035] Figure 5 is a third setting method schematic diagram of the bent auxiliary member in an embodiment of the present utility model;

[0036] Figure 6 is a structural schematic diagram of the core rod in an embodiment of the present utility model;

[0037] Figure 7 is a structural schematic diagram of the core rod in the application of a conventional bending catheter product in an embodiment of the present utility model;

[0038] Figure 8 is another structural schematic diagram of the core rod in the application of a conventional bending catheter product in an embodiment of the present utility model;

[0039] The descriptions of the reference numerals in each drawing are as follows:

[0040] 1 - Adjustable bending section, 101 - First inner tube, 102 - First outer tube, 2 - Pull wire, 301 - Bending auxiliary part cavity

[0041] 302 - Bending auxiliary part, 303 - Position adjustment track, 4 - Main body section, 401 - Second inner tube, 402 - Second outer tube, 5 - Handle, 6 - Head section, 501 - Bending control push button, 502 - Core rod, 503 - Adjusting gear, 5041 - First fixed bending structure, 5042 - First friction resistance part, 505 - Pull wire fixing part, 506 - Outer shell, 507 - Reinforcing ring, 50201 - Outer thread, 50202 - Distal section, 50203 - Gear groove, 50204 - Gradual change section, 50205 - Slide groove, 50206 - Proximal section, 50801 - Second friction resistance part, 50802 - Second fixed bending structure Specific embodiments

[0042] The following further elaborates on the present utility model in detail with reference to the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non - precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model. In addition, the structures shown in the accompanying drawings are often part of the actual structures. Particularly, the accompanying drawings need to show different focuses and sometimes use different scales. It should also be understood that unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish each component, element, step, etc. in the specification, rather than to represent the logical relationship or sequential relationship between each component, element, step, etc. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features

[0043] In this application document, "proximal" and "distal" are the relative orientations, relative positions, and directions of elements or actions relative to each other from the perspective of a doctor using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" generally refers to the end of the medical device that is closer to the doctor during normal operation, while "distal" generally refers to the end that first enters the patient's body

[0044] Please refer to Figure 1 and Figure 8 , an embodiment of the present utility model provides a handle 5 for controlling the bending of the distal end of a catheter. The handle 5 includes: a bending control push button 501, a core rod 502, an outer shell 506, a fixed bending structure, and a friction resistance structure

[0045] The bending control push button 501 is used to be fixed to the proximal end of the catheter. The distal end of the core rod 502 is fixedly connected to the proximal end of the bending control push button 501. The proximal end of the core rod 502 extends into the housing 506, and the core rod 502 is connected to the distal end of the catheter through the wire 2. The bending control push button 501 drives the core rod 502 to drive the wire 2 to move by moving relative to the housing 506, so as to change the bending of the distal end of the catheter. The bending control push button 501 is the directly stressed component when the handle 5 is applied to the catheter. During use, the bending control push button 501 remains relatively stationary with respect to the catheter. By driving the core rod 502 away from the housing 506, the wire 2 is pulled to bend the adjustable bending section 1 accordingly.

[0046] The fixed bending structure is fixed to the proximal end of the housing 506 and is disposed outside the core rod 502. The friction resistance structure is disposed between the fixed bending structure and the core rod 502. The friction resistance structure can undergo elastic deformation, and the elastic deformation amount of the friction resistance structure changes as relative movement occurs between the fixed bending structure and the core rod 502, so that different magnitudes of frictional forces can be generated between the friction resistance structure and the fixed bending structure and the core rod 502.

[0047] In an alternative embodiment, please specifically refer to Figure 1 , the fixed bending structure includes a first fixed bending structure 5041, and the friction resistance structure includes a first friction resistance member 5042. The first fixed bending structure 5041 is sleeved outside the core rod 502. There is a gap between the first fixed bending structure 5041 and the core rod 502, and the gap gradually decreases as the core rod 502 moves away from the housing 506, so that the elastic deformation amount of the first friction resistance member 5042 gradually increases, thereby making the frictional force between the first friction resistance member 5042 and the first fixed bending structure 5041 and the core rod 502 gradually increase. Preferably, as Figure 7 shown, the core rod 502 has a tapered section 50204, and the first fixed bending structure 5041 is sleeved outside the tapered section 50204, and the outer diameter of the tapered section 50204 gradually decreases from the proximal end to the distal end.

[0048] The first friction resistance member 5042 can be a silicone rubber ring or other materials that can generate friction resistance. The sum of the frictional forces between the first friction resistance member 5042, the core rod 502, and the first fixed bending structure 5041 should be greater than or equal to the reaction force required to overcome when controlling the bending of the stretching wire 2. During the bending control process, when the bending angle is larger, the reaction force required to overcome is greater. That is, when the core rod 502 moves to the maximum displacement relative to the outer shell 506, the frictional force between the silicone rubber ring, the core rod 502, and the first fixed bending structure 5041 should be greater than or equal to the bending reaction force at this time. Thus, the tapered section 50204 of the core rod 502 is set to gradually decrease in diameter from the proximal end to the distal end, presenting a frustum shape. When the bending angle is small, the gap between the core rod 502 and the first fixed bending structure 5041 is large, the extrusion degree of the silicone rubber ring is small, and the frictional force between the three is small. When the bending angle is large, the gap between the core rod 502 and the first fixed bending structure 5041 tightens, the extrusion degree of the silicone rubber ring increases, and the frictional force between the three increases. The tapered section 50204 of the core rod 502 can achieve reducing the unnecessary additional frictional force when reaching a small bend while ensuring the stable maintenance of the maximum bending angle, further improving the operating feel of the operator. By adjusting the wire diameter of the silicone rubber ring or the tightness of the fit between the first fixed bending structure 5041 and the threaded part at the distal end of the outer shell 506, the bending force of the handle 5 can be further adjusted. According to different application scenarios of the catheter, products with different diameters and hardnesses can be provided with core rods 502 and silicone rubber rings with different diameter tapering degrees and strokes (lengths) to achieve modular efficiency improvement for the controllability of the handle 5. According to different catheter diameters and bending angle requirements, the angle a between the generatrix (refer to the longitudinal outer edge line shown in Figure 6 and Figure 7 ) of the tapered section 50204 and the axis can be set to 0.02 - 15°, the tapering stroke of the tapered section 50204 can be set to 3 - 150 mm according to different bends, and the wire diameter of the silicone rubber ring can be set to 0.5 - 5.0 mm according to the fixed bending force requirement of the minimum bend.

[0049] In another alternative embodiment, please refer specifically to Figure 8, the core rod 502 is provided with a tapered sliding groove 50205 extending in a direction parallel to the axis; the fixed bending structure includes a second fixed bending structure 50802 and a second friction resistance member 50801. A part of the second fixed bending structure 50802 extends into the tapered sliding groove 50205 and is movably arranged along the extending direction of the tapered sliding groove 50205. The second friction resistance member 50801 is arranged in the tapered sliding groove 50205 and moves along with the movement of the second fixed bending structure 50802. The depth of the tapered sliding groove 50205 gradually decreases from the distal end to the proximal end, so that when the second fixed bending structure 50802 moves towards the proximal end or the core rod 502 moves away from the housing 506, the elastic deformation amount of the second friction resistance member 50801 gradually increases, thereby making the frictional force between the second friction resistance member 50801 and the second fixed bending structure 50802 and the core rod 502 gradually increase.

[0050] Figure 8 The direction indicated by the arrow in the figure is the direction in which the second fixed bending structure 50802 moves relative to the core rod 502 during bending control. The depth of the tapered sliding groove 50205 gradually decreases along this direction, providing a gradually increasing pressure for the second friction resistance member 50801, thereby gradually increasing the friction force within the handle 5 and providing a tapered bending control force. The depth of the tapered sliding groove 50205, the height and shape of the second friction resistance member 50801 can be determined according to the bending control force requirements. The greater the deformation of the second friction resistance member 50801 when it is squeezed, the greater the friction force provided by the handle 5. The second friction resistance member 50801 can be made of materials with good elasticity such as silicone rubber, fluororubber, and polyurethane.

[0051] In this embodiment, the core rod may further include a distal section 50202, and the distal part of the distal section 50202 can be designed to have an outer ring thread 50201 so as to be able to be threadedly connected with the bending control push button 501.

[0052] In some other alternative embodiments, the fixed bending structure may simultaneously include a combined structure of a first fixed bending structure 5041 and a first friction resistance member 5042, and a combined structure of a second fixed bending structure 50802 and a second friction resistance member 50801, and the two combined structures are used in cooperation for bending control. At this time, please refer to Figure 7 , the core rod 502 includes a distal section 50202 for setting the outer ring thread 50201, a tapered section 50204, and a proximal section 50206 for setting the tapered sliding groove 50205.

[0053] In addition, the handle 5 may further include a wire fixing component 505 and other components disposed within the housing 506, such as a reinforcing ring 507 provided at the proximal end of the housing 506. The wire fixing component 505 may be a fixed pulley, and the proximal end of the wire 2 is fixed to the core rod 502 after passing around the fixed pulley.

[0054] In addition, as Figure 1 shown, an embodiment of the present utility model further provides a medical catheter device, which includes: a handle 5, a main body section 4, an adjustable bending section 1, a head section 6, and a bending auxiliary member 302;

[0055] The handle 5, the main body section 4, the adjustable bending section 1, and the head section 6 are connected in sequence from the proximal end to the distal end; the handle 5 is connected to the adjustable bending section 1 through a wire 2, and the bending of the adjustable bending section 1 is changed by controlling the movement of the wire 2;

[0056] The bending auxiliary member 302 extends from within the handle 5 through the main body section 4 and extends into the adjustable bending section 1. The bending auxiliary member 302 is axially movably disposed, and the controllable bending length of the adjustable bending section 1 is changed by changing its own length within the adjustable bending section 1 through movement.

[0057] For the medical catheter device provided by the embodiment of the present utility model, as Figure 2 shown, when the bending auxiliary member 302 is adjusted distally, the controllable bending length of the adjustable bending section 1 can be gradually reduced, thereby gradually reducing the bending control radius of the adjustable bending section 1. When the bending auxiliary member 302 is adjusted proximally, the controllable bending length of the adjustable bending section 1 can be gradually increased, thereby gradually increasing the bending control radius of the adjustable bending section 1. In this way, the adjustment of the bending control radius can be achieved without replacing the catheter.

[0058] The medical catheter device provided by this embodiment may be a radiofrequency ablation catheter or other electrophysiological mapping catheters. When it is a radiofrequency ablation catheter, a plurality of ablation electrodes may be provided on the head section 6. When it is a mapping catheter, a mapping sensor, such as a temperature sensor, etc., may be provided on the head section 6. Alternatively, the medical catheter device provided by this embodiment is a catheter device integrating ablation and mapping, and ablation electrodes and other mapping electrodes may be simultaneously provided on the head section 6.

[0059] Furthermore, both the main body section 4 and the adjustable bending section 1 include an inner tube and an outer tube sleeved on the inner tube. The outer tube and the inner tube are spaced apart. The bending auxiliary member 302 is axially movably disposed within the spaced space between the inner tube and the outer tube, that is, this spaced space serves as a bending auxiliary cavity 301 for the bending auxiliary member 302 to pass through. And preferably, the outer side wall of the inner tube, the inner side wall of the outer tube, and / or the inner and outer surfaces of the bending auxiliary member 302 have lubricating coatings.

[0060] Specifically, the adjustable bending section 1 includes a first inner tube 101 and a first outer tube 102 sleeved on the first inner tube 101. The first inner tube 101 can use a lining braided layer, a single-cavity or multi-cavity structure without a braided layer according to performance requirements. The internal cavity of the first inner tube 101 is for wires, cold saline, etc. to pass through. The first outer tube 102 is set as a single-cavity structure. According to different application scenarios, the first outer tube 102 can selectively embed structures such as braided wires and springs in the pipe material to enhance the support. There is a clear dimensional difference between the outer diameter of the first inner tube 101 and the inner diameter of the first outer tube 102 to ensure that there is a spaced space between the first inner tube 101 and the first outer tube 102 as the bending auxiliary part cavity 301. Lubricating coatings made of materials such as PTFE are provided on the outer wall of the first inner tube 101 and the inner wall of the first outer tube 102 to reduce the surface friction, ensuring that the bending auxiliary part 302 can be smoothly pushed and withdrawn in the bending auxiliary part cavity 301. The length of the adjustable bending section 1 can be set with a minimum controllable bending length (when applied to small-diameter blood vessels such as the renal artery, the minimum controllable bending length can be set to 10 - 30 mm; when applied to organs with a larger space such as the heart, the minimum controllable bending length can be set to 30 - 55 mm) and a maximum controllable bending length (which can be set to 30 - 150 mm) according to different application scenarios. The difference between the maximum controllable bending length and the minimum controllable bending length is set as the adjustable stroke of the bending auxiliary part 302. The minimum controllable bending length is the length between the distal end of the adjustable bending section 1 and the most distal end of the stroke of the bending auxiliary part 302. The spaced space between the first inner tube 101 and the first outer tube 102 is eliminated by welding or other means to block the bending auxiliary part cavity 301 and limit the most distal end of the stroke of the bending auxiliary part 302.

[0061] The main body section 4 includes a second inner tube 401 and a second outer tube 402 sleeved on the second inner tube 401. The second inner tube 401 is connected to the first inner tube 101 by means such as gluing and hot melt welding to limit the bending auxiliary member 302 and isolate internal pipelines, brine pipes and other structures at the same time. Meanwhile, the second inner tube 401 can adopt structures such as inner lining braided wires and winding springs to enhance the main body support. The proximal end of the second inner tube 401 extends to the proximal end of the bending auxiliary member 302 to ensure that the internal structure of the second inner tube 401 will not be damaged when the bending auxiliary member 302 is moved. The second outer tube 402 is a single cavity tube made of polymer material, and braided wires and winding spring structures can be added according to application requirements. The distal end is connected to the first outer tube 102, and the proximal end is fixed to the handle 5. In addition to providing a certain support for the catheter, it also provides radial limitation for the bending auxiliary member 302. When the bending auxiliary member 302 is removed, the axial support of the composite pipe of the main body section 4 should be similar to that of the composite pipe of the adjustable bending section 1 and cannot be less than the latter, that is, the support of the non-controlled bending area during catheter bending is mainly provided by the bending auxiliary member 302. The bending auxiliary member 302 penetrates the main body section 4 of the catheter. No matter how the bending auxiliary member 302 is moved, it is necessary to ensure that the main body section 4 is lined with the bending auxiliary member 302.

[0062] When the bending auxiliary member 302 moves towards the distal end of the catheter (moves forward), the interval space between the inner tube and the outer tube of the adjustable bending section 1 is gradually occupied by the bending auxiliary member 302. The proximal section where the interval space is occupied by the bending auxiliary member 302 forms an obvious hardness difference from the distal cavity section without the bending auxiliary member 302 lined. When the catheter is bent, the adjustable bending section 1 is shortened to the area from the distal end of the bending auxiliary member 302 to the distal end of the catheter, realizing the bending from large to small; when the bending auxiliary member 302 moves towards the proximal end of the catheter (moves backward), the cavity section between the inner tube and the outer tube of the adjustable bending section 1 increases, and the length of the controllable bending section of the adjustable bending section 1 increases accordingly, and the bending becomes larger.

[0063] The bending auxiliary member 302 is made of a metal material with relatively high rigidity (such as medical stainless steel, nitinol alloy, etc.) or a polymer material (such as polyimide, etc.), and can be a single cavity tube structure or a braided tube structure. Its interior, through part of the first inner tube 101 and the whole of the second inner tube 401, provides sufficient support and stress dispersion for the catheter. Lubricating coatings (such as silicone oil, PTFE film) are added to the inner surface and outer surface of the bending auxiliary member 302 to ensure that it can move smoothly in the bending auxiliary member cavity 301.

[0064] In this embodiment, the curved auxiliary member 302 is provided with a position adjustment track 303 consistent with its movement stroke, and accordingly, the handle 5 may also include a curved adjustment gear 503, which cooperates with the position adjustment track 303 to control the axial forward and backward movement of the curved auxiliary member 302 by rotation. Further, the distal end section 50202 of the core rod 502 may also have a gear groove 50203, and the curved adjustment gear 503 is arranged in the gear groove 50203 in cooperation with the position adjustment track 303.

[0065] In some other embodiments, the curved adjustment gear 503 may also be replaced by other mechanical structures. For example, the curved auxiliary member 302 may be driven directly by a sliding member moving in a direction parallel to the axial direction of the curved auxiliary member 302. The sliding member is directly mechanically connected to the curved auxiliary member 302, and the handle 5 is provided with a through groove for the sliding member to move.

[0066] See also Figure 4 In some other embodiments, the main body section 4 and the adjustable bend section 1 are both provided with a wire drawing cavity for the wire drawing 2 to pass through and a bend auxiliary component cavity 301 for the bend auxiliary component 302 to pass through. The bend auxiliary component cavity 301 and the wire drawing cavity are located on opposite sides of an axis, and the axis is the axis of the main body section 4 and the adjustable bend section 1. That is, a separate channel can be provided at the opposite side of the wire drawing 2 inside the catheter for the bend auxiliary component 302 to pass through. At this time, the bend auxiliary component 302 can be set as a solid metal rod or a braided structure according to the support requirements of the pipe. The adjustable bend section 1 and the main body section 4 can both be set as a single-layer pipe. At the same time, the adjustable bend section 1 and the main body section 4 can be set to have similar support. The support of the catheter during bending is mainly provided by the bend auxiliary component 302.

[0067] See also Figure 5 In some other embodiments, the bending auxiliary member 302 may also be a tubular member, and the inner cavity of the tubular member constitutes a channel for the pull wire 2 to pass through. It is preferred to use a metal tube as the bending auxiliary member 302, and a winding tube, a hypotube, or a braided structure member may also be selected, and this application does not limit this. In this embodiment, the bending auxiliary member 302 increases the bending control capability while ensuring the support of the main body and saving the internal space of the tube.

[0068] It can be seen from the above description that the handle 5 provided in the embodiment of the utility model can be applied to the catheter with the bending auxiliary member 302 provided in this embodiment, and can also be applied to conventional catheter products with bending control requirements.

[0069] In summary, when the handle provided by the embodiment of the present utility model uses the fixed bending structure and the friction resistance member to control the bending of the distal end of the catheter, the control force at the handle can gradually increase with the bending angle when adjusting from a small-angle bending to a large-angle bending, improving the operator's handling feel. In addition, for the medical catheter device provided by the embodiment of the present utility model, by arranging a bending auxiliary member in the catheter and controlling the movement of the bending auxiliary member, the bending radius of the adjustable bending section of the catheter can be changed, so that the adjustment of the bending radius can be achieved without replacing the catheter.

[0070] The above description is only a description of the preferred embodiments of the present utility model and does not limit the scope of the present utility model in any way. Any changes and modifications made by those of ordinary skill in the field of the present utility model according to the above disclosure shall fall within the protection scope of the claims.

Claims

1. A handle for controlling the distal end bend of a catheter, characterized in that: The handle comprises: a bending control button, a core rod, a shell, a bending fixing structure and a friction resistance structure; The bending control button is used to be fixed to the proximal end of the catheter, the distal end of the core rod is fixedly connected to the proximal end of the bending control button, the proximal end of the core rod extends into the shell, and the core rod is connected to the distal end of the catheter through a pull wire, and the bending control button drives the core rod to drive the pull wire to move by moving relative to the shell, thereby changing the bending shape of the distal end of the catheter; The fixed bending structure is fixed at the proximal end of the shell and is arranged outside the core rod. The friction resistance structure is arranged between the fixed bending structure and the core rod. The friction resistance structure can undergo elastic deformation, and the elastic deformation amount of the friction resistance structure changes with the relative movement between the fixed bending structure and the core rod, so that the friction resistance structure can generate friction forces of different magnitudes between the fixed bending structure and the core rod.

2. The handle according to claim 1, characterized in that: The fixed bending structure includes a first fixed bending structure, and the friction resistance structure includes a first friction resistance member; the first fixed bending structure is sleeved outside the core rod, and there is a gap between the first fixed bending structure and the core rod, and the gap gradually decreases as the core rod moves away from the outer shell, so that the elastic deformation of the first friction resistance member gradually increases, thereby making the friction force between the first friction resistance member and the first fixed bending structure and the core rod gradually increase.

3. The handle according to claim 2, characterized in that: The core rod has a gradient section, the first fixed bending structure is sleeved outside the gradient section, and the outer diameter of the gradient section gradually decreases from the proximal end to the distal end.

4. The handle according to claim 3, characterized in that: The angle a between the generatrix of the gradient section and the axis is 0.02°-15°, and the gradient stroke of the gradient section is 3mm-150mm.

5. The handle according to claim 1 or 2, characterized in that: The core rod has a gradual sliding groove extending in a direction parallel to the axis; The fixed bending structure comprises a second fixed bending structure and a second friction resistance member, a portion of the second fixed bending structure extends into the gradual sliding groove and is movably arranged along the extension direction of the gradual sliding groove, and the second friction resistance member is arranged in the gradual sliding groove and moves with the movement of the second fixed bending structure; The depth of the gradual sliding groove gradually decreases from the distal end to the proximal end, so that when the second fixed bending structure moves toward the proximal end or the core rod moves in the direction away from the outer shell, the elastic deformation of the second friction resistance member gradually increases, thereby causing the friction force between the second friction resistance member and the second fixed bending structure and the core rod to gradually increase.

6. A medical catheter device, characterized in that: include: A catheter and a handle as claimed in any one of claims 1 to 5; The catheter comprises a main body section, an adjustable bend section and a head section, wherein the main body section, the adjustable bend section and the head section are sequentially connected from the proximal end to the distal end, the bend control button is fixed to the proximal end of the main body section, and the core rod is connected to the adjustable bend section via a pull wire.

7. The medical catheter device according to claim 6, characterized in that Also includes: Bending aids, The bending auxiliary piece extends from the handle to pass through the main body section and extends into the adjustable bending section. The bending auxiliary piece is movably arranged along the axial direction, and changes its own length in the adjustable bending section by movement to change the controllable bending length of the adjustable bending section.

8. The medical catheter device according to claim 7, characterized in that The main body section and the adjustable bending section both include an inner tube and an outer tube sleeved on the inner tube, the outer tube and the inner tube are spaced apart, and the bending auxiliary component is arranged around the inner tube in the space between the inner tube and the outer tube.

9. The medical catheter device according to claim 8, characterized in that The curved auxiliary member is a single-lumen tubular structure or a braided tube structure that can provide support for the main body segment.

10. The medical catheter device according to claim 8, wherein: The outer side wall of the inner tube, the inner side wall of the outer tube and / or the inner and outer surfaces of the bending auxiliary member have a lubricating coating.

11. The medical catheter device according to claim 7, wherein: The main body section and the adjustable bend section are both provided with a wire pulling cavity for the wire to pass through and a bent auxiliary piece cavity for the bent auxiliary piece to pass through. The bent auxiliary piece cavity and the wire pulling cavity are located on opposite sides of an axis, and the axis is the axis of the main body section and the adjustable bend section.

12. The medical catheter device of claim 7, wherein: The curved auxiliary member is a tubular member, and the inner cavity of the tubular member constitutes a channel for the pull wire to pass through.

13. The medical catheter device of claim 12, wherein: The tubular member is a metal tube, a winding tube, a hypotube or a braided tube.

14. The medical catheter device of claim 7, wherein: The curved auxiliary member is provided with a position adjustment track having a length consistent with its own stroke; The handle also includes a curved adjustment gear, which cooperates with the position adjustment track and drives the curved auxiliary part to move axially by rotating. The core rod includes a distal section, and the distal section has a gear groove. The curved adjustment gear is arranged in the gear groove to cooperate with the position adjustment track.

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