Interventional guiding catheter and interventional system
By designing controllable switch components on the interventional guide catheter, the problem of insufficient contrast agent shunt and support force caused by normal opening of the side hole is solved, and the effective use of contrast agent and the improvement of support performance are achieved, saving surgical time and medical costs.
Patent Information
- Application Number
- CN202422084550.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The normal opening of the side hole of the existing interventional guide catheter results in insufficient contrast medium shunt and support, affecting surgical results and increasing medical costs.
An interventional guide tube is designed, equipped with a switch assembly that can be optionally opened or closed, and the movement of the switch is controlled through the traction member to realize the switch of the side hole, ensuring that the contrast agent flows in a predetermined direction and improving support performance.
Reduce the use of contrast agent, improve the support performance of interventional guide catheters, save surgical time, reduce the use of therapeutic devices, and reduce patient pain and medical expenses.
Smart Images
Figure CN223208800U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and in particular to an interventional guiding catheter and an interventional system. Background Art
[0002] Percutaneous coronary intervention (PCI) is a commonly used treatment for coronary atherosclerosis. During PCI, a guiding catheter is first placed over a guidewire at the coronary artery ostium. The guidewire is then passed through the guiding catheter. Once the guidewire has passed the stenotic lesion, a balloon is inserted over the guidewire to dilate the local lesion. Finally, a stent is implanted and deployed to treat the lesion.
[0003] Due to differences in race, body shape and gender, the diameter of the coronary artery opening is different for each person. For individuals with smaller body shapes, the diameter of the coronary artery opening is usually less than 6F (1F≈0.33mm). This results in the outer wall of the guiding catheter being completely attached to the inner wall of the coronary artery after the guide catheter is placed or deeply inserted during PCI, resulting in no blood flow in the coronary artery and the disappearance of unilateral coronary blood supply in the target subject, thereby artificially causing acute myocardial ischemia due to blockage of the target subject's blood vessels. This phenomenon is life-threatening to the target subject. In order to avoid such situations, one approach is to radially open a side hole in the side wall of the supporting segment of the guiding catheter. The purpose of the side hole is mainly to ensure normal blood perfusion in the target subject's coronary artery and to prevent the deep insertion of the guiding catheter from artificially causing blockage of the target subject's coronary artery, thereby causing a pressure jump.
[0004] A side hole is opened on the guiding catheter. Although the guiding catheter with a side hole ensures normal blood perfusion of the target coronary artery, it also has the following disadvantages:
[0005] First, if a guiding catheter with a side hole structure directly opens a side hole radially on the side wall of the guiding catheter, the side hole is in a normally open state. During a PCI procedure, it is usually necessary to perform angiography through the lumen of the guiding catheter to observe the condition of the target object's blood vessels or the placement of the device. However, due to the existence of the side hole structure of the guiding catheter, the contrast agent will have different output ports at the distal end of the guiding catheter (it can flow out from the distal end of the guiding catheter or from the side hole). When a certain amount of contrast agent is injected from the proximal end of the guiding catheter, the guiding catheter with side holes has a contrast agent shunt problem compared to the guiding catheter of the same specification without side holes. The contrast agent does not flow out from the farthest end of the guiding catheter as set forth in the preset purpose. Therefore, in order to more clearly observe the condition of the target blood vessels of the target object, more contrast agent has to be used. However, excessive use of contrast agent will increase the burden on the target object's kidneys and other organs, thereby causing the risk of contrast agent damage.
[0006] Secondly, because side holes are typically located in the sidewalls of the guide catheter's support segment, the presence of these normally open side holes results in insufficient axial stiffness in this area, which in turn affects the guide catheter's support. Typically, the support strength of a guide catheter with normally open side holes is approximately 22% weaker than that of a similarly sized guide catheter without side holes. As a device that provides access for other therapeutic devices, the support of a guide catheter is a primary clinical requirement. Insufficient support directly impacts its ability to pass through, hindering the proper surgical procedure. When a guide catheter is bent due to a crown and has a device passing through its inner hole, the guide catheter's side holes may experience severe bending deformation or even flexion failure due to insufficient stiffness, rendering it unable to provide access for other devices and rendering it ineffective. This phenomenon necessitates intraoperative replacement of the guide catheter with stronger support. However, as a critical device providing access for other therapeutic devices, replacing the guide catheter during surgery requires the replacement of other devices, significantly increasing surgical time and costs.
[0007] Therefore, in response to the above technical defects, it is necessary to develop an interventional guide catheter with a side hole that can be selectively opened or closed. On the one hand, the side hole can be selectively opened or closed based on surgical needs. On the other hand, it helps to improve the support performance of the interventional guide catheter when closing the side hole. Utility Model Content
[0008] The utility model provides an interventional guiding catheter and an interventional system, wherein the interventional guiding catheter is equipped with a switch component for controlling the opening or closing of the side hole. By controlling the opening or closing of the side hole, the interventional guiding catheter is opened when needed to provide blood perfusion of the target blood vessel to the target object; the side hole is closed when not needed to ensure that the contrast agent flows in a predetermined direction, reducing the amount of contrast agent used, and at the same time improving the supporting performance of the interventional guiding catheter at the side hole, avoiding the potential disadvantages brought by the side hole, thereby saving operation time, reducing the use of interventional guiding catheters and other treatment instruments, and reducing consumption ratio.
[0009] The utility model provides an interventional guiding catheter, comprising: a catheter body, a switch assembly and a traction member;
[0010] The catheter body is provided with a side hole, which passes through from the outer wall of the catheter body to the inner wall thereof; the switch assembly includes a switch member, which is arranged in the catheter body; the traction member is connected to the switch member, and the traction member is used to pull at least a part of the switch member to move relative to the catheter body to open or close the side hole. The above-mentioned interventional guide catheter can selectively open or close the side hole by pulling the switch member by the traction member. When needed, the side hole is opened to provide blood perfusion of the target blood vessel to the target object; when not needed, the side hole is closed to ensure that the contrast agent flows in a predetermined direction and reduce the amount of contrast agent used. When the side hole is closed, it also helps to improve the support performance of the interventional guide catheter at the side hole, avoid the potential disadvantages brought by the side hole, thereby saving operation time, reducing the use of interventional guide catheters and other treatment instruments, and reducing consumption ratio. While meeting clinical needs, it reduces patient pain and reduces medical expenses.
[0011] Optionally, the switch is built into the wall of the catheter body, and the axis of the switch crosses the axis of the side hole, thereby facilitating the pulling movement of the switch and the control of the opening and closing of the side hole.
[0012] Optionally, the switch assembly further includes a pipe fitting, which is embedded in and fixed in the tube wall of the catheter body, the pipe fitting and the side hole are arranged crosswise, and a switch hole connected to the side hole is provided through the tube body of the pipe fitting; the switch part is filled in the pipe fitting, and the switch part is pulled by the traction part to move along the axial direction of the pipe fitting to open or close the switch hole.
[0013] Optionally, the tubular fitting is a hypotube. Using a hypotube as a tubular fitting provides, on the one hand, a certain degree of rigidity, thereby providing the tubular fitting with good support performance, thereby facilitating the provision of a channel for the switch member to move, and serving to guide the switch member so that the switch member can move smoothly along the axial direction of the tubular fitting. On the other hand, the hypotube also has good bending properties, allowing the tubular fitting to adapt to the bending of the catheter body without affecting the flexibility of the catheter body. Furthermore, the tubular fitting provides a certain degree of rigidity compensation for the location of the side hole in the catheter body, thereby compensating for the structural defects of the interventional guidance catheter sidewall caused by the opening of the side hole in the catheter body, and improving the support performance of the catheter body.
[0014] Optionally, the switch member is an elastomer, the proximal end of the switch member is fixedly connected to the proximal end of the pipe, and the traction member is connected to the distal end of the switch member; the switch member closes the switch hole in a natural state, and the traction member pulls the distal end of the switch member toward its proximal end to compress and elastically deform, thereby opening the switch hole. The switch member is made of an elastomer, and the switch hole can be opened by only pulling the distal end of the switch member through the traction member. When the switch hole is closed, it is only necessary to release the traction force on the distal end of the switch member so that the distal end of the switch member naturally rebounds and resets. Therefore, the switch member made of an elastomer only requires the traction member to apply force in one direction, that is, the traction member uses a flexible traction wire to achieve traction drive of the switch member, which is also conducive to the integration of the traction member into the catheter body. Moreover, the switch member is made of an elastomer, which can fill the inner wall of the pipe to form a good sealing effect, while also not affecting the bending performance of the catheter body.
[0015] Optionally, the interventional guidance catheter further includes a driving member, which is disposed on the catheter body and can move relative to the catheter body, the distal end of the traction member is connected to the switch member, and the proximal end of the traction member is connected to the driving member.
[0016] Optionally, a traction channel is provided in the tube wall of the catheter body, and the proximal end of the traction member passes through the traction channel and is connected to the driving member.
[0017] Optionally, the catheter body includes an inner layer, a braided layer, and an outer layer, the braided layer being located between the inner layer and the outer layer, and the side hole penetrating the inner layer, the braided layer, and the outer layer. The composite layer ensures the structural strength and bending performance of the catheter, while also facilitating integration of a switch assembly within the catheter body.
[0018] Optionally, the inner layer is provided with a notch, and the notch passes through from the outer wall of the inner layer to the inner wall thereof; the notch is opposite to the side hole, and the switch assembly is arranged in the notch.
[0019] The present utility model also provides an intervention system, which includes the intervention guiding catheter described above.
[0020] To summarize, the interventional guidance catheter includes a catheter body, a switch assembly, and a traction member; a side hole is provided on the catheter body, and the side hole extends from the outer wall of the catheter body to its inner wall; the switch assembly includes a switch member, and the switch member is arranged on the catheter body; the traction member is connected to the switch member, and the traction member is used to pull at least a part of the switch member to move relative to the catheter body to open or close the side hole.
[0021] With this configuration, the interventional guide catheter can selectively open or close the side hole by pulling the switch member with the traction member. When needed, the side hole is opened to provide blood perfusion to the target blood vessel of the target patient; when not needed, the side hole is closed to ensure that the contrast agent flows in the predetermined direction, reducing the amount of contrast agent used. When the side hole is closed, it also helps to improve the support performance of the interventional guide catheter at the side hole, avoiding the potential disadvantages caused by the side hole, thereby saving surgical time, reducing the use of interventional guide catheters and other treatment instruments, and reducing consumption. While meeting clinical needs, it also reduces patient pain and medical expenses.
[0022] The aforementioned interventional guidance catheter controls the opening or closing of the side hole through a switch assembly. The switch assembly is composed of a hypotube fitting and an elastomeric switch element. The hypotube fitting has a certain degree of rigidity, which provides the fitting with good support performance, facilitating the movement of the switch element and guiding it, allowing it to move smoothly along the axial direction of the fitting. On the other hand, the hypotube also has good bending properties, allowing the fitting to adapt to the bending of the catheter body without affecting the flexibility of the catheter body. The fitting also provides a certain degree of rigidity compensation for the location of the side hole in the catheter body, thereby compensating for the structural defects of the interventional guidance catheter side wall caused by the opening of the side hole in the catheter body and improving the support performance of the catheter body. In addition, the switch element is made of an elastomer. The switch hole can be opened by simply pulling the distal end of the switch element with a traction member to compress it. To close the switch hole, the traction on the distal end of the switch element is simply released, allowing the distal end of the switch element to naturally rebound and reset. Therefore, an elastomeric switch requires only a unidirectional force from the pull member, meaning that the pull member can be driven by a flexible pull wire. This also facilitates the pull member's integration into the catheter body. Furthermore, the elastomeric switch member can completely fill the inner wall of the tube, creating a good seal without affecting the bending performance of the catheter body. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 Schematic diagram of the structure of an interventional guide catheter with a normally open side hole;
[0024] Figure 2 This is a schematic diagram of the crown structure of an interventional guiding catheter with a normally open side hole;
[0025] Figure 3 This is a schematic structural diagram of an interventional guiding catheter in some embodiments of the present invention, in which the side hole is in an open state;
[0026] Figure 4 This is a schematic structural diagram of an interventional guiding catheter in some embodiments of the present invention, in which the side hole is in a closed state;
[0027] Figure 5Schematic diagram of the structure of the inner layer of some embodiments of the present utility model;
[0028] Figure 6 Schematic diagram of the structure of the pipe fittings in some embodiments of the present invention Figure 1 ;
[0029] Figure 7 Schematic diagram of the structure of the pipe fittings in some embodiments of the present invention Figure 2 ;
[0030] Figure 8 This is a schematic structural diagram of an interventional guiding catheter according to some embodiments of the present invention;
[0031] Figure 9 This is a schematic diagram of the partial structure of an interventional guiding catheter according to some embodiments of the present invention.
[0032] In the attached figure:
[0033] 1-normally open side hole; 2-target blood vessel;
[0034] 10-catheter body; 101-side hole; 102-traction channel; 103-channel; 11-inner layer; 12-braided layer; 13-outer layer;
[0035] 20 - switch assembly; 21 - switch member; 22 - pipe fitting; 221 - switch hole; 2211 - first through hole; 2212 - second through hole; 222 - threading hole; 223 - lumen;
[0036] 30-traction piece;
[0037] 40- driving member;
[0038] 50-Connecting pipe. DETAILED DESCRIPTION
[0039] The following is a detailed description of the interventional system proposed by the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clarify the purpose of illustrating the embodiments of the present invention.
[0040] In the present invention, "proximal end" and "distal end" refer to the relative orientation, position, and direction of components or actions relative to each other from the perspective of an operator using the product. Although "proximal end" and "distal end" are not restrictive, "proximal end" generally refers to the end of the product that is closest to the operator during normal operation, while "distal end" generally refers to the end that first enters the body of the target object.
[0041] As used in this utility model, the singular forms "a", "an", and "the" include plural referents. The term "or" is generally used to include the meaning of "and / or", the term "several" is generally used to include the meaning of "at least one", and the term "at least two" is generally used to include the meaning of "two or more". In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. In addition, as used in this utility model, "mounted", "connected", "connected", and one element "disposed" on another element should be understood broadly and generally only indicate a connection, coupling, mating, or transmission relationship between the two elements, and the connection, coupling, mating, or transmission between the two elements can be direct or indirect through an intermediate element. It should not be understood to indicate or imply a spatial positional relationship between the two elements, that is, one element can be in any orientation such as inside, outside, above, below, or to the side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used with respect to the exemplary embodiments as they are shown in the figures, with the upward or upper direction being toward the top of the corresponding figure, and the downward or lower direction being toward the bottom of the corresponding figure.
[0042] like Figure 1 As shown, in order to ensure normal blood perfusion of the target object's lesioned coronary artery, a group of normally open side holes 1 are opened on the existing guiding catheter, and the normally open side holes 1 are generally located on one side of the guiding catheter.
[0043] Combine Figure 2 As shown, during a PCI interventional procedure, after the guide catheter is crowned, contrast agent is injected through the guide catheter and is expected to flow out of the distal end of the guide catheter into the target vessel 2, facilitating clear observation of the target vessel 2 of the target patient. However, due to the presence of a permanently open side hole 1 at the distal end of the guide catheter, some contrast agent is diverted at the distal end, preventing the contrast agent from being fully injected into the target vessel 2 as expected, thus affecting the operator's angiographic observation of the target vessel 2. Therefore, the operator typically injects more contrast agent to mitigate the effect of contrast agent diversion from the permanently open side hole 1, which can lead to unclear observation of the target vessel 2. The location of the side hole 1 on the guide catheter is equivalent to an axial structural defect, significantly reducing axial stiffness. When the guide catheter is bent due to crowning and a device is passed through the inner hole, the lack of stiffness at the opening of the hole can cause the guide catheter to severely bend or even kink, leading to failure.
[0044] Please refer to Figure 3 and Figure 4 As shown, this embodiment provides an interventional guiding catheter, comprising: a catheter body 10 , a switch assembly 20 and a traction member 30 .
[0045] The catheter body 10 is provided with a side hole 101 , which passes through from the outer wall of the catheter body 10 to the inner wall thereof.
[0046] The switch assembly 20 includes a switch member 21, which is arranged in the catheter body 10; the traction member 30 is connected to the switch member 21, and the traction member 30 is used to pull at least a portion of the switch member 21 to move relative to the catheter body 10 to open or close the side hole 101.
[0047] In this embodiment, since the catheter body 10 is a flexible structure and needs to be inserted into a blood vessel, the pulling member 30 is arranged along the catheter body 10 . The pulling member 30 uses a metal wire to pull the switch member 21 .
[0048] When the side hole 101 is closed, the contrast agent injected into the catheter body 10 can flow out through the distal end of the catheter body 10, achieving the purpose of precise guidance. When the side hole 101 is opened, the blood in the blood vessel can flow through the side hole 101 into the lumen of the catheter body 10, and then flow through the distal end of the catheter body 10 to the target blood vessel, achieving the purpose of providing blood perfusion to the target blood vessel.
[0049] The above-mentioned interventional guide catheter can selectively open or close the side hole 101 by pulling the switch member 21 with the pulling member 30. When needed, the side hole 101 is opened to provide blood perfusion to the target blood vessel of the target object; when not needed, the side hole 101 is closed to ensure that the contrast agent flows in a predetermined direction, reducing the amount of contrast agent used. When the side hole 101 is closed, it also helps to improve the support performance of the interventional guide catheter at the side hole 101, avoiding the potential disadvantages caused by the side hole 101, thereby saving surgical time, reducing the use of interventional guide catheters and other treatment instruments, and reducing consumption. While meeting clinical needs, it also reduces patient pain and reduces medical expenses.
[0050] Please refer to Figure 3 and Figure 4 As shown, the catheter body 10 is a circular tube structure with a composite layer structure. Specifically, from the inside out, the catheter body 10 comprises an inner layer 11, a braided layer 12, and an outer layer 13. Since the side hole 101 penetrates the tube wall of the catheter body 10, the side hole 101 actually penetrates the inner layer 11, the braided layer 12, and the outer layer 13.
[0051] The material of the inner layer 11 can be a blend of one or more of polyurethane (TPU), polypropylene (pebax), polytetrachloroethylene (PTFE), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and nylon. Figure 5 As shown, the inner layer 11 is a circular tube structure. A traction channel 102 is provided in the inner wall of the inner layer 11 along the axial direction of the inner layer 11. The traction channel 102 is a circular channel for the traction member 30 to pass through. The lumen of the inner layer 11 serves as a channel 103 for the passage of instruments, and the channel 103 also serves as the inner lumen of the catheter body 10.
[0052] The braided layer 12 is woven from stainless steel wire. Of course, the braided layer 12 can be made of a corresponding material based on its usage requirements. The arrangement of the braided layer 12 ensures good support for the catheter body 10 while also ensuring the bending performance of the catheter body 10.
[0053] The material of the outer layer 13 can be a blend of one or more of polyurethane (TPU), polypropylene (pebax), polytetrachloroethylene (PTFE), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and nylon.
[0054] The braided layer 12 is wrapped by the inner layer 11 and the outer layer 13 to ensure the smoothness of the inner wall and the outer wall of the catheter body 10 and improve the passing performance of the catheter body 10 .
[0055] The catheter body 10 is made of a composite layer to ensure the structural strength and bending performance of the catheter, while also facilitating the integration of a switch assembly into the catheter body.
[0056] Please continue to refer to Figure 3 and Figure 4 As shown, the switch assembly 20 further includes a pipe 22 .
[0057] The inner layer 11 is provided with a notch, which extends from the outer wall of the inner layer 11 to its inner wall; the notch is arranged radially opposite to the side hole 101, and the switch assembly 20 is arranged in the notch. Specifically, the pipe 22 is built into the notch and can be fixed to the inner layer 11 by welding. The length and inner and outer diameter specifications of the pipe 22 are determined based on actual use requirements, and the notch is opened to adapt to the size of the pipe 22. The pipe 22 is arranged along the axial direction of the catheter body 10, and the side hole 101 is opened along the radial direction of the catheter body 10. Therefore, the axis of the pipe 22 is arranged crosswise with the axis of the side hole 101. The cross-arrangement makes it easier for the traction member 30 to pull the switch member to move, thereby facilitating the control of the opening and closing of the side hole 101.
[0058] During the manufacturing process of the interventional guide catheter, the tube 22 can be first installed in the notch, and then holes can be punched through the inner layer 11, the braided layer 12, the outer layer 13, and the tube 22 by laser or physical cutting. During this punching process, the side hole 101 on the catheter body 10 and the switch hole 221 on the tube 22 are naturally formed.
[0059] Please combine Figure 3 、 Figure 4 as well as Figure 6 As shown, the pipe body of the pipe fitting 22 is provided with a switch hole 221 connected to the side hole 101. It should be noted that the pipe body penetration here is different from the pipe wall penetration, wherein the pipe wall penetration refers to the opening penetrating the side wall of one side of the pipe fitting 22, while the pipe body penetration refers to the opening penetrating the pipe body of the pipe fitting 22. In terms of the specific structure, it means that the pipe fitting 22 is provided with through holes on both sides opposite to each other in the radial direction, and the pair of openings constitute the switch hole 221. Figure 6 and Figure 7 As shown, a switch hole 221 is opened in the radial direction on the pipe 22. Figure 7 As shown, a first through hole 2211 is provided on one side of the pipe fitting 22 along the radial direction, and a second through hole 2212 is provided on the other side along the radial direction. The first through hole 2211 and the second through hole 2212 are opposite to each other along the radial direction and constitute a switch hole 221, so that the tube body surface of the pipe fitting 22 passes through the switch hole 221 along one side of its radial direction to the other side.
[0060] Combine Figure 3 and Figure 4 As shown, the switch hole 221 and the side hole 101 are arranged opposite each other, so that the side hole 101 can be connected with the inner cavity of the tube 22 through the switch hole 221, and the side hole 101 can be connected with the inner cavity of the inner layer 11 after passing through the switch hole 221.
[0061] The switch member 21 is inserted into the tube 22. When the switch member 21 moves to a position corresponding to the switch hole 221, the switch hole 221 is closed. When the switch member 21 moves out of alignment with the switch hole 221, the switch hole 221 is opened. Therefore, the switch member 21 is pulled by the pulling member 30 to move along the axial direction of the tube 22, thereby opening or closing the switch hole 221.
[0062] Please refer to Figure 5As shown, in this embodiment, the pipe 22 is a circular tube structure, and the pipe 22 adopts a hypotube, such as nickel-titanium alloy or stainless steel. The hypotube is spirally cut, and its cutting pitch can be designed according to the rigidity and elasticity requirements of the interventional guide catheter. The pipe 22 adopts a hypotube. On the one hand, it has a certain rigidity, so that the pipe 22 has better supporting performance, which is conducive to providing a channel for the switch 21 to move, and is used to form a guiding effect for the switch 21, so that the switch 21 can move smoothly along the axial direction of the pipe 22. On the other hand, the hypotube also has good bending performance, so that the pipe 22 can bend and deform with the bending adaptability of the catheter body 10 without affecting the flexibility of the catheter body 10; and the pipe 22 provides a certain rigidity compensation for the position where the side hole of the catheter body 10 is opened, thereby compensating for the side wall structural defects of the interventional guide catheter caused by the opening of the hole at the position where the side hole of the catheter body 10 is opened, thereby improving the support performance of the catheter body 10. The catheter body 10 adopts the above-mentioned switch assembly 20 with the tube 22, which can realize the selective opening and closing of the side hole, thereby providing blood perfusion to the target blood vessel of the target object without reducing the support of the interventional guidance catheter.
[0063] In other alternative embodiments, the pipe fitting 22 may be a conventional pipeline structure, and the pipe fitting 22 may be made of a material with a certain degree of rigidity and flexibility. The specific structure and material used for the pipe fitting 22 may be adaptively selected based on actual usage requirements.
[0064] In this embodiment, the switch member 21 is made of an elastic body. The length of the switch member 21 should be set to ensure that the switch member 21 fills the lumen of the tube member 22, and the outer diameter of the switch member 21 should be set to ensure that the switch member 21 is tightly fitted with the inner wall of the lumen of the tube member 22. The switch member 21 can be made of silicone or other known elastic materials. Figure 6 and Figure 7 As shown, a threading hole 222 is reserved at the proximal end of the tube 22, and the diameter of the threading hole 222 is smaller than the inner diameter of the lumen 223 of the tube 22. Therefore, the switch 21 is filled in the lumen 223 of the tube 22, and the proximal end of the switch 21 abuts against the proximal end of the tube 22, thereby securing the proximal end of the switch 21 relative to the tube 22. The pulling member 30 passes through the threading hole 222 and is connected to the distal end of the switch 21 by gluing or welding.
[0065] Combine Figure 3As shown, when the pulling member 30 pulls the distal end of the switch member 21 toward its proximal end, compressing and elastically deforming it, the switch member 21 and the side hole 101 are offset along the axial direction of the catheter body 10, thereby opening the switch hole 221. When the switch hole 221 is opened, since the switch hole 221 is connected to the side hole 101, it means that the side hole 101 is also opened. When the side hole 101 is opened, the inside and outside of the catheter body 10 are connected through the side hole 101. Blood can enter the inner lumen of the catheter body 10 through the side hole 101 and flow into the target blood vessel at the distal end of the catheter body 10, establishing a blood supply channel for the target blood vessel, thereby achieving the purpose of providing blood perfusion to the target blood vessel of the target subject.
[0066] Combine Figure 4 As shown, when the traction force of the traction member 30 is released, the distal end of the switch member 21 in its natural state rebounds and resets, placing the switch member 21 in its naturally extended state. The switch member 21 overlaps with the side hole 101 and closes the switch hole 221. When the switch hole 221 is closed, the side hole 101 is also closed. When the side hole 101 is closed, when contrast agent is injected into the catheter body 10, the contrast agent does not leak out of the side hole 101 but is injected entirely through the distal end of the catheter body 10 into the target blood vessel of the target patient, achieving clear imaging.
[0067] In this embodiment, the switch member 21 is constructed of an elastomer. The switch hole 221 can be opened by simply compressing the distal end of the switch member 21 with the pull member 30. To close the switch hole 221, the pull force applied to the distal end of the switch member 21 is released, allowing the distal end of the switch member 21 to naturally rebound and reset. Therefore, the elastomer switch member 21 only requires unidirectional force from the pull member 30, i.e., the pull member 30 utilizes a flexible pull wire to achieve traction and drive of the switch member 21. This also facilitates the integration of the pull member 30 into the catheter body 10. Furthermore, the elastomer construction of the switch member 21 does not affect the bending performance of the catheter body 10.
[0068] In this embodiment, the switch assembly 20 is integrated into the inner layer 11. In other alternative embodiments, the switch assembly 20 may be disposed in other layers, such as in the outer layer 13 or even in the braided layer 12.
[0069] In this embodiment, the switch member 21 is made of an elastomer. During the traction process of the traction member 30, the distal end of the switch member 21 moves while the proximal end remains stationary, that is, the switch member 21 partially moves. In other alternative embodiments, the switch member 21 can also be made of a rigid member. Its switching principle is consistent with the switching principle of the above-mentioned elastomer. The difference is that the switch member 21 needs to be driven in both directions to make it move as a whole. In this case, an elastic member can be added near the proximal end of the tube 22, and the traction member 30 can be used to pull the switch member 21 toward the proximal side. When the traction force of the traction member 30 is released, the elastic force of the elastic member drives the switch member 21 to move in the reverse direction.
[0070] In this embodiment, the switch assembly 20 is arranged along the axial direction of the catheter body 10, and the side hole 101 is opened along the radial direction of the catheter body 10. The switch assembly 20 and the side hole 101 form a cross structure, and the switch member 21 moves in a direction perpendicular to the side hole 101 to control the opening or closing of the side hole 101. In other alternative embodiments, the switch assembly 20 is arranged along the circumferential direction of the catheter body 10, that is, the switch member 21 moves along the circumferential direction of the catheter body 10 to control the opening or closing of the side hole 101. In this case, the switch assembly 20 and the side hole 101 also form an approximately cross structure. In other alternative embodiments, the switch assembly 20 can be arranged along the opening direction of the side hole 101, that is, the switch member 21 moves along the opening direction of the side hole 101 to open or close the side hole 101. For example, when the switch member 21 moves toward the side hole, a portion of it is inserted into the side hole 101, closing the side hole 101. When the switch member 21 moves away from the side hole, the switch member 21 is pulled out of the side hole 101 to open the side hole 101. In this case, the switch member 21 needs to be driven in both directions. The traction member 30 pulls the switch member 21 to move unilaterally. At the same time, an elastic member can be provided. When the traction force of the traction member 30 is released, the elastic force of the elastic member drives the switch member 21 to return to the opposite direction.
[0071] Combine Figure 3 、 Figure 4 As shown, in this embodiment, the side hole 101 is a circular hole, and there are two side holes 101, which are arranged along the axial direction of the catheter body 10. Figure 6 As shown, the pipe 22 is also adaptively provided with two sets of switch holes 221, which are respectively opposite and connected to the two side holes 101. In other alternative embodiments, the shape, number, and arrangement of the side holes 101 can be adaptively adjusted based on actual usage requirements. Similarly, the shape, number, and arrangement of the switch holes 221 can also be adaptively changed with the side holes 101.
[0072] In this embodiment, the switch assembly 20 is composed of a switch member 21 and a tube member 22. In other alternative embodiments, the switch assembly 20 may include only the switch member 21. For example, the switch member 21 is directly embedded in the inner layer 11, and the traction member 30 is used to pull and drive the switch member 21.
[0073] Furthermore, the interventional guidance catheter also includes a driving member 40, which is arranged on the catheter body 10 and can move relative to the catheter body 10. The distal end of the traction member 30 is connected to the switch member 21, and the proximal end of the traction member 30 is connected to the driving member 40.
[0074] Please refer to Figure 8 As shown, the driving member 40 is in a sleeve structure, and the proximal end of the catheter body 10 is also connected to a connecting tube 50. A portion of the driving member 40 is sleeved on the distal end of the catheter body 10, and the other portion is sleeved on the proximal end of the connecting tube 50. The traction member 30 passes through the traction channel 102 to the outside of the proximal end of the catheter body 10 and passes through the through hole in the connecting tube 50 to be connected to the driving member 40. The traction member 30 and the driving member 40 can be connected by welding or bonding. When the driving member 40 moves relative to the connecting tube 50, the driving member 40 will tighten or loosen the traction member 30. When the traction member 30 is subjected to axial tension, the traction member 30 tightens the distal end of the switch member 21, causing it to compress and deform, thereby causing the switch member 21 to be relatively misaligned with the switch hole 221, thereby achieving the purpose of opening the side hole 101. When the side hole 101 wants to be closed, the driving member 40 moves axially relative to the connecting tube 50, loosening the traction member 30, and releasing the tension at the distal end of the switch member 21, causing it to naturally rebound and reset until it fills the inside of the tube 22, thereby blocking the side hole 101.
[0075] refer to Figure 9 As shown, the driver 40 has an internal thread that engages with the connecting tube 50. When the driver 40 rotates on the connecting tube 50, it rotates and moves axially relative to the catheter body 10. Therefore, the driver 40 can tighten or loosen the pulling member 30, thereby pulling the switch member 21 relative to the catheter body 10 through the pulling member 30.
[0076] In other alternative embodiments, the driving member 40 may be axially slidably engaged with the connecting tube 50 to tighten or loosen the pulling member 30. Alternatively, the driving member 40 may be rotationally engaged with the connecting tube 50 in a single degree of freedom to tighten or loosen the pulling member 30. The engagement method between the driving member 40 and the connecting tube 50 may be adaptively adjusted based on actual usage requirements.
[0077] In this embodiment, a connecting tube 50 is provided. The connecting tube 50 is a hard tube that provides a foundation for the installation of the driver 40. In other alternative embodiments, the driver 40 can also be directly installed at the distal end of the catheter body 10 and form an axial sliding fit with the catheter body 10.
[0078] This embodiment also provides an interventional system, which includes the interventional guide catheter described above. Furthermore, the interventional system also includes components such as a balloon dilatation interventional guide catheter and a balloon. The specific structure of the interventional system remains consistent with the prior art and will not be further described here.
[0079] To summarize, the interventional guidance catheter includes a catheter body, a switch assembly, and a traction member; a side hole is provided on the catheter body, and the side hole extends from the outer wall of the catheter body to its inner wall; the switch assembly includes a switch member, and the switch member is arranged on the catheter body; the traction member is connected to the switch member, and the traction member is used to pull at least a part of the switch member to move relative to the catheter body to open or close the side hole.
[0080] With this configuration, the interventional guide catheter can selectively open or close the side hole by pulling the switch member with the traction member. When needed, the side hole is opened to provide blood perfusion to the target blood vessel of the target patient; when not needed, the side hole is closed to ensure that the contrast agent flows in the predetermined direction, reducing the amount of contrast agent used. When the side hole is closed, it also helps to improve the support performance of the interventional guide catheter at the side hole, avoiding the potential disadvantages caused by the side hole, thereby saving surgical time, reducing the use of interventional guide catheters and other treatment instruments, and reducing consumption. While meeting clinical needs, it also reduces patient pain and medical expenses.
[0081] The above description is only a description of the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.
Claims
1. An interventional guide catheter, characterized in that: include: Catheter body, switch assembly and traction member; The catheter body is provided with a side hole, which passes through the outer wall of the catheter body to the inner wall thereof; The switch assembly includes a switch member, and the switch member is arranged in the catheter body; The pulling member is connected to the switch member, and is used to pull at least a portion of the switch member to move relative to the catheter body to open or close the side hole.
2. The interventional guiding catheter according to claim 1, wherein: The switch component is built into the tube wall of the catheter body, and the axis of the switch component is arranged to intersect with the axis of the side hole.
3. The interventional guiding catheter according to claim 1 or 2, characterized in that: The switch assembly further includes a pipe fitting, which is embedded in and fixed in the wall of the catheter body, the pipe fitting and the side hole are arranged crosswise, and a switch hole communicating with the side hole is provided through the pipe body of the pipe fitting; The switch member is filled in the tube member, and the switch member is pulled by the pulling member to move along the axial direction of the tube member to open or close the switch hole.
4. The interventional guiding catheter according to claim 3, wherein: The pipe fitting is a hypotube.
5. The interventional guiding catheter according to claim 3, wherein: The switch member is an elastic body, the proximal end of the switch member is fixedly connected to the proximal end of the tube member, and the pulling member is connected to the distal end of the switch member; The switch member closes the switch hole in a natural state, and opens the switch hole when the pulling member pulls the distal end of the switch member toward the proximal end thereof to compress and elastically deform.
6. The interventional guiding catheter according to claim 1, wherein: The interventional guiding catheter further includes a driving member, which is disposed on the catheter body and can move relative to the catheter body. The distal end of the pulling member is connected to the switch member, and the proximal end of the pulling member is connected to the driving member.
7. The interventional guiding catheter according to claim 6, wherein: A traction channel is provided in the tube wall of the catheter body, and the proximal end of the traction member passes through the traction channel and is connected to the driving member.
8. The interventional guiding catheter according to claim 1, wherein: The catheter body includes an inner layer, a braided layer and an outer layer, the braided layer is located between the inner layer and the outer layer, and the side hole penetrates the inner layer, the braided layer and the outer layer.
9. The interventional guiding catheter according to claim 8, wherein: The inner layer is provided with a notch, and the notch passes through the outer wall of the inner layer to the inner wall thereof; The notch is directly opposite to the side hole, and the switch assembly is arranged in the notch.
10. An interventional system, characterized in that: include: The interventional system comprises the interventional guiding catheter according to any one of claims 1 to 9.