Microcatheter
By introducing a curved section and a spiral support sleeve into the microcatheter, the problem that the microcatheter cannot pass through complex blood vessels is solved, and flexible adjustment and convenient wire guidance effect is achieved.
Patent Information
- Application Number
- CN202510482058.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2025-07-11
AI Technical Summary
The existing microcatheters do not have the function of tuning, making them difficult to pass through bifurcation lesions or tortuous blood vessels, especially bifurcation lesions with large angles, and are not convenient to guide the guide wire into.
A micro-conduit is designed, including a tube body, a traction wire and an adjustment handle. The tuning section is provided in the tube body. The tuning section is composed of a base layer and a spiral support sleeve. The tuning section is bent by pulling the traction wire by adjusting the handle. The base layer is composed of multiple rotational sections, and the spiral support sleeve provides elastic support.
It realizes flexible adjustment of the microcatheter, can adjust the curvature as needed, facilitate entry into tortuated lesions or angular branched blood vessels, and improves the convenience of use and the guidance ability of the guidewire.
Smart Images
Figure CN120285404A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of medical devices, and particularly to a microcatheter. Background Art
[0002] A microcatheter is a relatively small-diameter reinforced catheter. Generally, a catheter with a diameter of 0.70 to 1.30 mm can be called a microcatheter. Microcatheters are mainly used to send a thinner microcatheter along a guide wire into a blood vessel with the support of a guiding catheter, not limited to the opening of large blood vessels, so as to provide greater support force for the guide wire and facilitate the replacement of the guide wire. With the continuous improvement of the complexity of current interventional treatment lesions, microcatheters are becoming more and more commonly used in clinics. However, current microcatheters do not have a bending adjustment function and can only travel along the natural curvature of blood vessels. For bifurcated lesions, especially those with a large angle or tortuous blood vessels, it is difficult for microcatheters to pass through and it is not convenient to guide the guide wire into them. Summary of the Invention
[0003] Embodiments of this application provide a microcatheter to solve the problem that microcatheters do not have a bending adjustment function and are not convenient to use.
[0004] To solve the above technical problems, this application is implemented as follows: The microcatheter provided by the embodiments of this application includes: a tube body, a traction wire, and an adjustment handle; the tube body includes a bending adjustment section, the bending adjustment section includes a base layer and a spiral support sleeve, the base layer includes a plurality of rotating sections that are sequentially connected end to end in a rotating manner, the rotation axes of any two adjacent rotating sections are perpendicular to the extension direction of the bending adjustment section and are all parallel to each other, and the spiral support sleeve is sleeved inside the base layer; the adjustment handle is connected to one end of the tube body away from the bending adjustment section, one end of the traction wire is connected to the end of the tube body facing away from the adjustment handle, and the other end is connected to the adjustment handle. The adjustment handle is used to pull the traction wire to bend the bending adjustment section.
[0005] In some embodiments, the outer wall of the spiral support sleeve abuts against the inner wall of the bending adjustment section.
[0006] In some embodiments, the spiral support sleeve is made of an elastic wire extending in a cylindrical spiral shape.
[0007] In some embodiments, in the direction from the adjustment handle to the tube body, the cross-sectional dimension of the elastic wire gradually decreases.
[0008] In some embodiments, the adjustment handle includes a housing, a knob, and a slider; the slider is slidably disposed inside the housing, the knob is threadedly connected to the slider, and the traction wire is connected to the slider.
[0009] In some embodiments, the adjusting handle further includes a locking key, which is slidably connected to the housing. A convex post is provided on the side of the locking key facing the knob, and the knob is provided with a plurality of grooves. When the convex post is inserted into any one of the grooves, the locking key restricts the rotation of the knob relative to the housing.
[0010] In some embodiments, in the extending direction of the bending section, one end of the rotating joint is provided with a recess, and the other end is provided with a protrusion. The protrusion is embedded in the recess of the adjacent rotating joint, so that two adjacent rotating joints are rotatably connected.
[0011] In some embodiments, the side wall of the recess facing the protrusion is a first arc surface, and the side wall of the protrusion facing the recess is a second arc surface. The second arc surface is sleeved in the first arc surface, and the second arc surface is slidably engaged with the first arc surface.
[0012] In some embodiments, the number of the traction wires is two. The two traction wires are respectively arranged on two opposite sides of the tube body, and the direction in which the two traction wires face each other is perpendicular to the axis direction of two adjacent rotating joints.
[0013] In some embodiments, the tube body further includes a straight section; the straight section is located on the side of the bending section away from the adjusting handle, and the straight section is provided with a traction ring, and the traction wire is connected to the traction ring.
[0014] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects: In the embodiments of the present application, the matrix layer of the bending section includes a plurality of rotating joints that are sequentially connected end to end in a rotating manner. One end of the traction wire is connected to the end of the tube body away from the adjusting handle, and the other end is connected to the adjusting handle. Therefore, the bending section can be bent by manipulating the adjusting handle to pull the traction wire.
[0015] It can be seen from this that the microcatheter provided by the embodiments of the present application can be adjusted in curvature directionally according to requirements, so that the operator can flexibly adjust the direction of the end of the microcatheter according to requirements. Therefore, compared with the microcatheters without bending function in the related art, the microcatheter provided by the present application has the advantages of being easy to use and facilitating the guiding of the microcatheter and the guide wire into tortuous lesions or angled branch blood vessels.
[0016] In addition, the bending adjustment section of the microcatheter provided in the embodiments of the present application is lined with a spiral support sleeve. In this way, the bending adjustment section has a certain toughness. Therefore, during the process of retracting the traction wire, the bending adjustment section can better switch from a large bending angle to a small bending angle under the action of the spiral support sleeve. Thus, the usability of the microcatheter can be better improved.
[0017] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0019] Figure 1 Schematic diagram of a microcatheter provided in an embodiment of the present application, showing a case where the microcatheter includes a traction wire; Figure 2 For Figure 1 Partial schematic diagram of the microcatheter shown in Figure 3 Schematic diagram of a matrix layer provided in an embodiment of the application; Figure 4 For Figure 3 Partial schematic diagram of the matrix layer and the spiral support sleeve shown in Figure 5 For Figure 3 Partial schematic diagram of the matrix layer and the spiral support sleeve shown in , showing a case where part of the rotating joint is hidden; Figure 6 Partial schematic diagram of a spiral support sleeve provided in an embodiment of the application; Figure 7 Partial schematic diagram of a matrix layer provided in an embodiment of the application; Figure 8 Another partial schematic diagram of a matrix layer provided in an embodiment of the application from another angle; Figure 9 Partial exploded schematic diagram of a matrix layer provided in an embodiment of the application; Figure 10 Partial top view of a matrix layer provided in an embodiment of the application; Figure 11 Schematic diagram of another microcatheter provided in an embodiment of the present application, showing a case where the microcatheter includes two traction wires; Figure 12 is Figure 11 a partial schematic view of the microcatheter shown in Figure 13 a partial schematic view of a microcatheter provided by an embodiment of the present application, which shows the part where the adjustment handle of the microcatheter is located; Figure 14 a schematic diagram showing the corresponding relationship between the travel difference of the two-sided traction wires and the deflection angle of the bending section provided by an embodiment of the present application; Figure 15 a table showing the corresponding relationship between the bending angle, the travel of the traction wire, and the rotation angle of the bending knob for a 5F microcatheter provided by an embodiment of the present application; Figure 16 a table showing the corresponding relationship between the bending angle, the travel of the traction wire, and the rotation angle of the bending knob for a 6F microcatheter provided by an embodiment of the present application; Figure 17 a table showing the corresponding relationship between the bending angle, the travel of the traction wire, and the rotation angle of the bending knob for a 7F microcatheter provided by an embodiment of the present application; Figure 18 a table showing the corresponding relationship between the bending angle, the travel of the traction wire, and the rotation angle of the bending knob for an 8F microcatheter provided by an embodiment of the present application.
[0020] Description of the reference numerals: 1 - microcatheter; 100 - tube body; 110 - bending section; 111 - matrix layer; 1110 - rotating joint; 1111 - recessed part; 1112 - protruding part; 112 - spiral support sleeve; 120 - straight section; 121 - traction ring; 130 - torsion control support section; 200 - traction wire; 300 - adjustment handle; 310 - housing; 320 - knob; 330 - slider; 340 - locking key. Detailed implementation manners
[0021] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.
[0022] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.
[0023] In addition, although the terms used in the present application are selected from well-known and commonly used terms, some of the terms mentioned in the description of the present application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein.
[0024] In addition, it is required to understand the present application not only through the actual terms used, but also through the meaning implied by each term.
[0025] The following will describe in detail the technical solutions provided by each embodiment of the present application with reference to the accompanying drawings.
[0026] An embodiment of the present application provides a microcatheter. Referring to Figures 1 to 13 , the microcatheter 1 provided by the embodiment of the present application includes: a tube body 100, a traction wire 200, and an adjustment handle 300. It should be noted that in the embodiments of the present application, "microcatheter" can be understood based on the common general knowledge in the art. Exemplarily, a microcatheter refers to a catheter with a diameter of 0.70 to 1.30 millimeters.
[0027] In the embodiment of the present application, the tube body 100 includes a bending adjustment section 110. The bending adjustment section 110 includes a base layer 111 and a spiral support sleeve 112. The base layer 111 includes a plurality of rotating joints 1110 that are sequentially rotatably connected end to end. The rotation axes of any two adjacent rotating joints 1110 are perpendicular to the extending direction of the bending adjustment section 110 and are parallel to each other, and the spiral support sleeve 112 is sleeved inside the base layer 111.
[0028] The adjustment handle 300 is connected to one end of the tube body 100 away from the bending adjustment section 110. One end of the traction wire 200 is connected to the end of the tube body 100 facing away from the adjustment handle 300, and the other end is connected to the adjustment handle 300. The adjustment handle 300 is used to pull the traction wire 200 to bend the bending adjustment section 110.
[0029] Taking Figure 10 as an example, the bending adjustment section 110 extends in the left-to-right direction, and the rotation axes of any two adjacent rotating joints 1110 all extend in a direction perpendicular to the paper surface. Therefore, the rotation axes of any two adjacent rotating joints 1110 are perpendicular to the extending direction of the bending adjustment section 110. Combining Figure 1 , Figure 2 and Figure 10, when the upper left corner of the bending section 110 is pulled from left to right, the left end of the bending section 110 will bend upward. Furthermore, when one end of the traction wire 200 is connected to the end of the tube 100 away from the adjustment handle 300 and the other end is connected to the adjustment handle 300, the bending section 110 can be bent by operating the adjustment handle 300 to pull the traction wire 200.
[0030] In this way, in an embodiment of the present application, the base layer 111 of the bending adjustment section 110 includes a plurality of rotating joints 1110 that are sequentially connected end to end, one end of the traction wire 200 is connected to the end of the tube body 100 that is away from the adjusting handle 300, and the other end is connected to the adjusting handle 300. Therefore, the bending adjustment section 110 can be bent by operating the adjusting handle 300 to pull the traction wire 200.
[0031] It can be seen that the microcatheter 1 provided in the embodiment of the present application can adjust its curvature according to the requirements, so that the operator can flexibly adjust the direction of the end of the microcatheter 1 according to the requirements. Therefore, compared with the microcatheter without the bending adjustment function in the related art, the microcatheter 1 provided in the embodiment of the present application has the advantages of being easy to use and easy to guide the microcatheter 1 and the guidewire into tortuous lesions or angled branch vessels.
[0032] In addition, the bending adjustment section 110 of the microcatheter 1 provided in the embodiment of the present application is lined with a spiral support sleeve 112, so that the bending adjustment section 110 has a certain toughness. Therefore, during the playback of the traction wire 200, the bending adjustment section 110 can be better switched from a large bending angle to a lower bending angle under the action of the spiral support sleeve 112, thereby better improving the ease of use of the microcatheter 1.
[0033] In some embodiments, the outer wall of the spiral support sleeve 112 abuts against the inner wall of the bending adjustment section 110. In this way, the spiral support sleeve 112 directly supports the bending adjustment section 110 to provide elastic restoring force to the base layer 111 more directly.
[0034] Of course, in other embodiments, a separation sleeve may be sandwiched between the spiral support sleeve 112 and the base layer 111 to prevent the spiral support sleeve 112 from directly contacting the base layer 111, thereby avoiding possible wear on the contact surface of the spiral support sleeve 112 and the base layer 111.
[0035] It should be noted that, in some embodiments, the spiral support sleeve 112 and the base layer 111 are both made of metal materials. Since metal materials have good wear resistance, a separation sleeve may not be provided between the spiral support sleeve 112 and the base layer 111 .
[0036] refer to Figure 6, in some embodiments, the spiral support sleeve 112 is made of elastic wires extending in a cylindrical spiral shape. Exemplarily, the spiral support sleeve 112 is made of metal wires extending in a cylindrical spiral shape. For example, a metal pipe can be processed into the spiral support sleeve 112 by means of laser cutting.
[0037] In some embodiments, in the direction from the adjusting handle 300 towards the tube body 100, the cross-sectional dimension of the elastic wire gradually decreases. For Figure 1 example, the direction from the adjusting handle 300 towards the tube body 100 is the direction from right to left. In the embodiments of the present application, by means of the cross-sectional dimension of the elastic wire gradually decreasing in the direction from the adjusting handle 300 towards the tube body 100, the elastic restoring force on the side of the spiral support sleeve 112 close to the adjusting handle 300 can be made greater than the elastic restoring force on the side of the spiral support sleeve 112 away from the adjusting handle 300. In this way, it can be made that on the side of the bending section 110 away from the adjusting handle 300, it is easier to bend and deform under the pulling action of the pulling wire 200.
[0038] Reference Figure 13 , in some embodiments, the adjusting handle 300 includes a housing 310, a knob 320 and a slider 330. The slider 330 is slidably disposed in the housing 310, the knob 320 is threadedly connected to the slider 330, and the pulling wire 200 is connected to the slider 330. In this way, since the knob 320 is threadedly connected to the slider 330, when the knob 320 is rotated, the slider 330 will move relative to the housing 310, and further, the pulling wire 200 can be pulled by the moving slider 330.
[0039] In some embodiments, the adjusting handle 300 further includes a locking key 340, and the locking key 340 is slidably and cooperatively connected to the housing 310. A convex column is provided on the side of the locking key 340 facing the knob 320, and a plurality of grooves are provided on the knob 320. When the convex column is inserted into any one of the grooves, the locking key 340 restricts the rotation of the knob 320 relative to the housing 310. In this way, after the knob 320 is adjusted to a suitable angle, by driving the locking key 340 to move towards the knob 320, the convex column of the locking key 340 can be inserted into the groove of the knob 320, so that the rotation of the knob 320 relative to the housing 310 can be restricted. Furthermore, the bending section 110 can be maintained in a specific bending shape.
[0040] Reference Figures 7 to 10 , in some embodiments, in the extending direction of the bending section 110, a concave portion 1111 is provided at one end of the rotating joint 1110, and a convex portion 1112 is provided at the other end. The convex portion 1112 is embedded in the concave portion 1111 of the adjacent rotating joint 1110 to rotatably connect the adjacent two rotating joints 1110.
[0041] In some embodiments, the side wall of the recessed portion 1111 facing the raised portion 1112 is a first arc surface, and the side wall of the raised portion 1112 facing the recessed portion 1111 is a second arc surface, the second arc surface is sleeved in the first arc surface, and the second arc surface and the first arc surface are slidably matched. In this way, the two adjacent rotating joints 1110 can be rotatably connected by the sliding match between the second arc surface and the first arc surface.
[0042] refer to Figure 11 and Figure 12 In some embodiments, the number of the traction wires 200 is two, and the two traction wires 200 are respectively arranged on two opposite sides of the tube body 100. The relative directions of the two traction wires 200 are perpendicular to the rotation axis directions of the two adjacent rotating joints 1110. In this way, by providing two traction wires 200, the bending section 110 can be bent and deformed in two different directions respectively, so as to improve the bending flexibility of the microcatheter 1.
[0043] It should be noted that, when there are two traction wires 200, there are two sliders 330. One of the sliders 330 is connected to the knob 320 via a left-handed thread, and the other slider 330 is connected to the knob 320 via a right-handed thread. In this way, when the knob 320 is turned, one slider 330 slides relative to the housing 310 in the direction from the adjustment handle 300 toward the tubular body 100, and the other slider 330 slides relative to the housing 310 in the direction from the tubular body 100 toward the adjustment handle 300. Then, one traction wire 200 pulls the end of the tubular body 100, and the other traction wire 200 is played back.
[0044] refer to Figure 1 and Figure 2 In some embodiments, the tube body 100 further includes a straight section 120. The straight section 120 is located on the side of the bending adjustment section 110 away from the adjustment handle 300. The straight section 120 is provided with a traction ring 121, and the traction wire 200 is connected to the traction ring 121. In this way, the bending adjustment section 110 can be bent and deformed by pulling the traction ring 121 with the traction wire 200.
[0045] In some embodiments, the straight section 120 further includes a developing ring. In some embodiments, a guiding soft head is disposed at one end of the straight section 120 away from the bending section 110 .
[0046] refer to Figure 1 In some embodiments, the tube body 100 further includes a twist control support section 130 , and the twist control support section 130 is disposed between the bending adjustment section 110 and the adjustment handle 300 .
[0047] refer to Figure 14 , which shows a schematic diagram of the corresponding relationship between the travel difference of the traction wires 200 on both sides and the deflection angle of the bending adjustment section 110.Figure 14 , the travel difference L between the two traction wires 200 satisfies the following formula: L = 2π(R - r)(a / 360) = 2πD(a / 360); where L is the travel difference between the two traction wires 200; R is the bending radius of the outer traction wire; r is the bending radius of the inner traction wire; D is the distance between the outer traction wire and the inner traction wire; a is the deflection angle of the bending section.
[0048] It should be noted that in the above example, two traction wires 200 are set for the convenience of those skilled in the art to understand the calculation principle of the corresponding relationship between the travel difference of the traction wire 200 and the deflection angle of the bending section 110. Similarly, in some embodiments, only one traction wire 200 may be set. In the case where there is one traction wire 200, the travel L of the traction wire 200 satisfies the following formula: L1 = 2π(R1 - r1)(a1 / 360) = 2πD1(a1 / 360); where L1 is the travel of the traction wire 200; R1 is the bending radius of the center line of the bending section; r1 is the bending radius of the inner traction wire; D1 is the distance between the inner traction wire and the center line of the bending section; a1 is the deflection angle of the bending section.
[0049] In addition, the inventors of the present application also provide the corresponding relationships between the bending angle, the travel of the traction wire, and the rotation angle of the bending knob for microcatheters 1 of different size specifications for reference by those skilled in the art. Among them, Figures 15 to 18 , are the corresponding relationship tables of the bending angle, the travel of the traction wire, and the rotation angle of the bending knob for the microcatheters 1 of 5F specification, 6F specification, 7F specification, and 8F specification respectively.
[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.
[0051] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the embodiments of the present application. The scope of the embodiments of the present application is defined by the appended claims and their equivalents.
Claims
1. A microcatheter (1), characterized in that, Comprising: A tube body (100), a traction wire (200) and an adjustment handle (300); The tube body (100) includes a bending section (110), the bending section (110) includes a base layer (111) and a spiral support sleeve (112), the base layer (111) includes a plurality of rotating joints (1110) that are sequentially connected end to end in a rotating manner, the rotating shafts of any two adjacent rotating joints (1110) are perpendicular to the extending direction of the bending section (110) and are all parallel to each other, and the spiral support sleeve (112) is sleeved inside the base layer (111); The adjustment handle (300) is connected to one end of the tube body (100) far from the bending section (110), one end of the traction wire (200) is connected to the end of the tube body (100) facing away from the adjustment handle (300), and the other end is connected to the adjustment handle (300). The adjustment handle (300) is used to pull the traction wire (200) so that the bending section (110) bends.
2. The microcatheter (1) according to claim 1, characterized in that, The outer wall of the spiral support sleeve (112) abuts against the inner wall of the bending section (110).
3. The microcatheter (1) according to claim 1, characterized in that, The spiral support sleeve (112) is made of an elastic wire extending in a cylindrical spiral manner.
4. The microcatheter (1) according to claim 3, characterized in that, In the direction from the adjustment handle (300) towards the tube body (100), the cross-sectional dimension of the elastic wire gradually decreases.
5. The microcatheter (1) according to claim 1, characterized in that, The adjustment handle (300) includes a housing (310), a knob (320) and a slider (330); the slider (330) is slidably arranged inside the housing (310), the knob (320) is threadedly connected to the slider (330), and the traction wire (200) is connected to the slider (330).
6. The microcatheter (1) according to claim 5, characterized in that, The adjustment handle (300) further includes a locking key (340), the locking key (340) is slidably and cooperatively connected to the housing (310), a convex column is provided on one side of the locking key (340) facing the knob (320), and the knob (320) is provided with a plurality of grooves. When the convex column is inserted into any one of the grooves, the locking key (340) restricts the knob (320) from rotating relative to the housing (310).
7. The microcatheter (1) according to claim 1, characterized in that, In the extending direction of the bending section (110), one end of the rotating joint (1110) is provided with a recessed portion (1111), and the other end is provided with a protruding portion (1112). The protruding portion (1112) is embedded in the recessed portion (1111) of the adjacent rotating joint (1110) so that the two adjacent rotating joints (1110) are rotatably connected.
8. The microcatheter (1) according to claim 7, characterized in that, The side wall of the recessed portion (1111) facing the protruding portion (1112) is a first arc surface, the side wall of the protruding portion (1112) facing the recessed portion (1111) is a second arc surface, the second arc surface is sleeved inside the first arc surface, and the second arc surface is slidably engaged with the first arc surface.
9. The microcatheter (1) according to claim 1, characterized in that, The number of the traction wires (200) is two, and the two traction wires (200) are respectively arranged on two opposite sides of the tube body (100). The direction in which the two traction wires (200) face each other is perpendicular to the axis directions of two adjacent rotating joints (1110).
10. The microcatheter (1) according to claim 1, characterized in that, The tube body (100) further includes a straight section (120); the straight section (120) is located on a side of the bending section (110) away from the adjusting handle (300). A traction ring (121) is arranged on the straight section (120), and the traction wire (200) is connected to the traction ring (121).