Microcatheter
By introducing a bend-adjusting section and a spiral support sleeve into the microcatheter, the problem of the microcatheter being difficult to pass through bifurcation lesions is solved, achieving the effect of flexible adjustment and convenient access to tortuous blood vessels.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU RAINMED INTELLIGENT TECH DEV LTD
- Filing Date
- 2025-04-17
- Publication Date
- 2026-04-28
AI Technical Summary
Existing microcatheters lack the ability to adjust their curvature, making it difficult to pass through bifurcation lesions or tortuous blood vessels, especially bifurcation lesions with large angles, and also making it difficult to guide the guidewire in.
A microcatheter was designed, including a tube body, a traction wire, and an adjusting handle. The tube body has a bending section, which consists of a matrix layer and a spiral support sleeve. The bending section is bent by pulling the traction wire with the adjusting handle. The bending section is lined with a spiral support sleeve to increase its toughness.
It enables directional adjustment of the curvature of the microcatheter, facilitating access to tortuous lesions or angled branch vessels, thus improving ease of use and flexibility.
Smart Images
Figure CN224166698U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and in particular to a microcatheter. Background Technology
[0002] A microcatheter is a relatively small, reinforced catheter, generally defined as one with a diameter of 0.70 to 1.30 mm. Microcatheters are primarily used, with the support of a guiding catheter, to deliver a finer catheter along a guidewire into the blood vessel, not just limited to the opening of large vessels. This provides greater support for the guidewire and facilitates guidewire replacement. With the increasing complexity of interventional lesions, the clinical application of microcatheters is becoming more widespread. However, current microcatheters lack bending capabilities and can only travel along the natural curvature of the vessel. For bifurcation lesions, especially those with large angles or tortuous vessels, microcatheters have difficulty passing through and guiding the guidewire is inconvenient. Utility Model Content
[0003] This application provides a microcatheter to solve the problem that microcatheters lack bending adjustment function and are inconvenient to use.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows:
[0005] The microcatheter provided in this embodiment includes: a tube body, a traction wire, and an adjusting handle; the tube body includes a bending section, the bending section includes a base layer and a spiral support sleeve, the base layer includes a plurality of rotating segments connected end to end in sequence, the axis of rotation of any two adjacent rotating segments is perpendicular to the extension direction of the bending section and is parallel to each other, the spiral support sleeve is sleeved in the base layer; the adjusting handle is connected to the end of the tube body away from the bending section, 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, the adjusting handle is used to pull the traction wire to bend the bending section.
[0006] In some embodiments, the spiral support sleeve is made of elastic wire that extends in a cylindrical spiral.
[0007] In some embodiments, the cross-sectional size of the elastic wire gradually decreases in the direction from the adjusting handle toward the tube body.
[0008] In some embodiments, the adjustment handle includes a housing, a knob, and a slider; the slider is slidably disposed within the housing, the knob is threadedly connected to the slider, and the traction wire is connected to the slider.
[0009] In some embodiments, the adjustment handle further includes a locking key, which is slidably connected to the housing. The locking key has a protrusion on the side facing the knob, and the knob has a plurality of grooves. When the protrusion is inserted into any one of the grooves, the locking key restricts the knob from rotating relative to the housing.
[0010] In some embodiments, in the extending direction of the bending section, one end of the rotary 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 rotary joint so that the two adjacent rotary joints are rotatably connected.
[0011] In some embodiments, the sidewall of the recess facing the protrusion is a first arc surface, and the sidewall of the protrusion facing the recess is a second arc surface. The second arc surface is fitted inside the first arc surface, and the second arc surface slides in conjunction with the first arc surface.
[0012] In some embodiments, the number of traction wires is two, and the two traction wires are respectively disposed on opposite sides of the tube body. The direction of the two traction wires is perpendicular to the rotation axis direction of the two adjacent rotating sections.
[0013] In some embodiments, the tube body further includes a straight section; the straight section is located on the side of the bending section opposite to the adjusting handle, the straight section is provided with a traction ring, and the traction wire is connected to the traction ring.
[0014] In some embodiments, the tube body further includes a torque control support section, which is disposed between the bending section and the adjusting handle.
[0015] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:
[0016] In the embodiments of this application, the base layer of the bending section includes a plurality of rotating sections that are connected end to end in sequence. One end of the traction wire is connected to the end of the tube away from the adjustment handle, and the other end is connected to the adjustment handle. Therefore, the bending section can be bent by pulling the traction wire by manipulating the adjustment handle.
[0017] Therefore, the microcatheter provided in this application embodiment can be oriented and its curvature adjusted as needed, allowing operators to flexibly adjust the direction of the microcatheter tip according to requirements. Thus, compared with related technologies' microcatheters that lack bending adjustment capabilities, the microcatheter provided in this application has the advantages of being easy to use and facilitating the guidance of the microcatheter and guidewire into tortuous lesions or angulated branch vessels.
[0018] Furthermore, the microcatheter provided in this application embodiment has a spiral support sleeve inside the bending section, which gives the bending section a certain degree of toughness. Thus, during the retraction of the traction wire, the bending section can switch from a large bending angle to a lower bending angle under the action of the spiral support sleeve, thereby improving the ease of use of the microcatheter.
[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of a microcatheter provided for an embodiment of this application, showing a microcatheter including a traction wire;
[0022] Figure 2 for Figure 1 A partial schematic diagram of the microcatheter is shown in the image;
[0023] Figure 3 A schematic diagram of a substrate layer provided for an embodiment of the application;
[0024] Figure 4 for Figure 3 A partial schematic diagram of the base layer and the spiral support sleeve is shown in the figure;
[0025] Figure 5 for Figure 3 The diagram shows a partial view of the base layer and the spiral support sleeve, which shows the case where part of the rotating joint is hidden;
[0026] Figure 6 A partial schematic diagram of a spiral support sleeve provided in the embodiment of the application;
[0027] Figure 7 A partial schematic diagram of a substrate layer provided for an embodiment of the application;
[0028] Figure 8 A partial schematic diagram of a substrate layer from another angle, provided for an embodiment of the application;
[0029] Figure 9 A partially exploded view of a matrix layer provided in the embodiment of the application;
[0030] Figure 10 A partial top view of a substrate layer provided for an embodiment of the application;
[0031] Figure 11 A schematic diagram of another microcatheter provided for an embodiment of this application shows a microcatheter comprising two traction wires;
[0032] Figure 12 for Figure 11 A partial schematic diagram of the microcatheter is shown in the image;
[0033] Figure 13 This is a partial schematic diagram of a microcatheter provided in an embodiment of this application, showing the location of the microcatheter's adjustment handle;
[0034] Figure 14 A schematic diagram illustrating the correspondence between the stroke difference of the two traction wires and the deflection angle of the bending section, provided for an embodiment of this application;
[0035] Figure 15 A table showing the correspondence between the bending angle, the traction wire stroke, and the rotation angle of the bending knob for a 5F microcatheter provided in this application embodiment;
[0036] Figure 16 A table showing the correspondence between the bending angle, the traction wire stroke, and the rotation angle of the bending knob for a 6F microcatheter provided in this application embodiment;
[0037] Figure 17 A table showing the correspondence between the bending angle, the traction wire stroke, and the rotation angle of the bending knob for a 7F microcatheter provided in this application embodiment;
[0038] Figure 18 This application provides a table showing the correspondence between the bending angle, the traction wire stroke, and the rotation angle of the bending knob for an 8F microcatheter.
[0039] Explanation of reference numerals in the attached figures:
[0040] 1-Microcatheter;
[0041] 100 - Pipe body; 110 - Bending section; 111 - Base layer; 1110 - Rotary joint; 1111 - Recessed part; 1112 - Protruding part; 112 - Spiral support sleeve;
[0042] 120 - Straight section; 121 - Traction ring;
[0043] 130 - Torque Control Support Section;
[0044] 200-traction wire;
[0045] 300 - Adjustment handle;
[0046] 310 - Housing;
[0047] 320 - Knob;
[0048] 330-slider;
[0049] 340 - Lock key. Detailed Implementation
[0050] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0052] Furthermore, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application specification may have been selected by the applicant at his or her own discretion, and their detailed meanings are explained in the relevant sections of this description.
[0053] Furthermore, this application is required to be understood not only through the actual terms used, but also through the meaning implied by each term.
[0054] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.
[0055] This application provides a microcatheter. (See reference...) Figures 1 to 13 The microcatheter 1 provided in this application embodiment includes: a tube body 100, a traction wire 200, and an adjusting handle 300. It should be noted that, in the embodiments of this application, the term "microcatheter" can be understood based on common knowledge in the art. For example, a microcatheter refers to a catheter with a diameter of 0.70 to 1.30 mm.
[0056] In an embodiment of this application, the pipe 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 segments 1110 connected end-to-end in sequence. The axis of rotation of any two adjacent rotating segments 1110 is perpendicular to the extension direction of the bending section 110 and is parallel to each other. The spiral support sleeve 112 is fitted inside the base layer 111.
[0057] The adjusting handle 300 is connected to the end of the tube body 100 away from the bending section 110. One end of the traction wire 200 is connected to the end of the tube body 100 away from the adjusting handle 300, and the other end is connected to the adjusting handle 300. The adjusting handle 300 is used to pull the traction wire 200 to bend the bending section 110.
[0058] by Figure 10 For example, the bending section 110 extends from left to right, and the axes of rotation of any two adjacent swivel joints 1110 extend in a direction perpendicular to the paper surface. Therefore, the axes of rotation of any two adjacent swivel joints 1110 are perpendicular to the extension direction of the bending section 110. (Combined with...) Figure 1 , Figure 2 and Figure 10 At the upper left corner of the bending section 110, under the pulling force from left to right, the left end of the bending section 110 will bend upwards. Furthermore, with one end of the traction wire 200 connected to the end of the tube 100 away from the adjusting handle 300 and the other end connected to the adjusting handle 300, the bending section 110 can be bent by pulling the traction wire 200 by manipulating the adjusting handle 300.
[0059] In this way, in the embodiments of this application, the base layer 111 of the bending section 110 includes a plurality of rotating sections 1110 connected end to end in sequence. 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. Therefore, the bending section 110 can be bent by pulling the traction wire 200 by manipulating the adjustment handle 300.
[0060] Therefore, the microcatheter 1 provided in this application embodiment can be oriented and its curvature adjusted as needed, allowing operators to flexibly adjust the direction of the end of the microcatheter 1 according to requirements. Thus, compared with microcatheters in related technologies that lack bending adjustment capabilities, the microcatheter 1 provided in this application has the advantages of being easy to use and facilitating the guidance of the microcatheter 1 and guidewire into tortuous lesions or angulated branch vessels.
[0061] Furthermore, the microcatheter 1 provided in this application embodiment has a spiral support sleeve 112 lining the bending section 110, which gives the bending section 110 a certain degree of toughness. Thus, during the retraction of the traction wire 200, the bending section 110 can switch from a large bending angle to a lower bending angle under the action of the spiral support sleeve 112, thereby improving the ease of use of the microcatheter 1.
[0062] In some embodiments, the outer wall of the spiral support sleeve 112 abuts against the inner wall of the bending section 110. In this way, the spiral support sleeve 112 directly supports the bending section 110, so as to provide elastic restoring force to the substrate layer 111 more directly.
[0063] Of course, in other embodiments, a partition sleeve may be provided 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 surfaces of the spiral support sleeve 112 and the base layer 111 that are in contact.
[0064] It should be noted that in some embodiments, both the spiral support sleeve 112 and the base layer 111 are made of metal. Since metal has good wear resistance, it is not necessary to provide a separator between the spiral support sleeve 112 and the base layer 111.
[0065] refer to Figure 6 In some embodiments, the spiral support sleeve 112 is made of an elastic filament extending in a cylindrical spiral. Exemplarily, the spiral support sleeve 112 is made of a metal wire extending in a cylindrical spiral. For example, a metal tube can be processed into the spiral support sleeve 112 by laser cutting.
[0066] In some embodiments, the cross-sectional dimension of the elastic wire gradually decreases in the direction from the adjusting handle 300 toward the tube 100. Figure 1 For example, the direction from the adjusting handle 300 towards the tube body 100 is from right to left. In the embodiments of this application, by gradually decreasing the cross-sectional size of the elastic wire in the direction from the adjusting handle 300 towards the tube body 100, the elastic restoring force of the spiral support sleeve 112 on the side closer to the adjusting handle 300 is greater than the elastic restoring force on the side of the spiral support sleeve 112 away from the adjusting handle 300. In this way, the side of the bending section 110 away from the adjusting handle 300 can be bent and deformed more easily under the pulling action of the traction wire 200.
[0067] refer to Figure 13In some embodiments, the adjusting handle 300 includes a housing 310, a knob 320, and a slider 330. The slider 330 is slidably disposed within the housing 310, the knob 320 is threadedly connected to the slider 330, and the traction wire 200 is connected to the slider 330. Thus, because 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, thereby pulling the traction wire 200 through the moving slider 330.
[0068] In some embodiments, the adjusting handle 300 further includes a locking key 340, which is slidably connected to the housing 310. The locking key 340 has a protrusion on the side facing the knob 320, and the knob 320 has multiple grooves. When the protrusion is inserted into any of the grooves, the locking key 340 restricts the rotation of the knob 320 relative to the housing 310. Thus, after the knob 320 is adjusted to a suitable angle, the protrusion of the locking key 340 can be inserted into the groove of the knob 320 by driving the locking key 340 toward the knob 320, thereby restricting the rotation of the knob 320 relative to the housing 310. This allows the bending section 110 to maintain a specific bending shape.
[0069] refer to Figures 7 to 10 In some embodiments, in the extending direction of the bending section 110, one end of the rotating joint 1110 is provided with a recess 1111 and the other end is provided with a protrusion 1112. The protrusion 1112 is embedded in the recess 1111 of the adjacent rotating joint 1110 so that the two adjacent rotating joints 1110 are rotatably connected.
[0070] In some embodiments, the sidewall of the recess 1111 facing the protrusion 1112 is a first arcuate surface, and the sidewall of the protrusion 1112 facing the recess 1111 is a second arcuate surface. The second arcuate surface is fitted inside the first arcuate surface, and the second arcuate surface and the first arcuate surface are in sliding engagement. In this way, two adjacent rotating joints 1110 can be rotatably connected by the sliding engagement of the second arcuate surface and the first arcuate surface.
[0071] refer to Figure 11 and Figure 12 In some embodiments, there are two traction wires 200, which are respectively located on opposite sides of the tube body 100. The opposing direction of the two traction wires 200 is perpendicular to the rotation axis direction of the two adjacent rotating sections 1110. In this way, by setting two traction wires 200, the bending section 110 can be bent and deformed in two different directions, thereby improving the bending flexibility of the microcatheter 1.
[0072] It should be noted that when there are two traction wires 200, there are also two sliders 330. One slider 330 is connected to the knob 320 via a left-hand thread, and the other slider 330 is connected to the knob 320 via a right-hand thread. This allows one slider 330 to slide relative to the housing 310 in the direction from the adjusting handle 300 toward the tube 100, while the other slider 330 slides relative to the housing 310 in the same direction. This results in one traction wire 200 pulling on the end of the tube 100, while the other traction wire 200 retracts.
[0073] 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 section 110 opposite to the adjusting handle 300, and the straight section 120 is provided with a traction ring 121, to which the traction wire 200 is connected. In this way, the bending section 110 can be bent and deformed by pulling the traction ring 121 with the traction wire 200.
[0074] In some embodiments, the straight section 120 further includes a developing ring. In some embodiments, a guide tip is provided at one end of the straight section 120 opposite to the bending section 110.
[0075] refer to Figure 1 In some embodiments, the tube body 100 further includes a torque control support section 130, which is located between the bending section 110 and the adjusting handle 300.
[0076] refer to Figure 14 This diagram illustrates the correspondence between the stroke difference of the two traction wires 200 and the deflection angle of the bending section 110. (Reference) Figure 14 The stroke difference L between the two traction wires 200 on both sides satisfies the following formula:
[0077] L=2π(Rr)(a / 360)=2πD(a / 360);
[0078] Where L is the travel difference of the two traction wires 200;
[0079] R is the bending radius of the outer traction wire;
[0080] r is the bending radius of the inner traction wire;
[0081] D is the distance between the outer traction wire and the inner traction wire;
[0082] 'a' represents the deflection angle of the curve section.
[0083] It should be noted that the above example uses two traction wires 200 for illustration to facilitate understanding by those skilled in the art of the calculation principle regarding the relationship between the stroke 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 used. When there is only one traction wire 200, the stroke L of the traction wire 200 satisfies the following formula:
[0084] L1=2π(R1-r1)(a1 / 360)=2πD1(a1 / 360);
[0085] Where L1 is the stroke of the traction wire 200;
[0086] R1 is the bending radius of the centerline of the bending section;
[0087] r1 is the bending radius of the inner traction wire;
[0088] D1 is the distance between the inner traction wire and the center line of the bending section;
[0089] a1 is the deflection angle of the curve section.
[0090] Furthermore, the inventors of this application have also provided microcatheters 1 of different sizes and specifications, along with the corresponding relationships between bending angles, traction wire strokes, and bending knob rotation angles, for reference by those skilled in the art. Figures 15 to 18 The table shows the corresponding relationships between the bending angle, traction wire stroke, and bending knob rotation angle for microcatheter 1 in 5F, 6F, 7F, and 8F specifications.
[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0092] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the embodiments of this application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A microcatheter (1), characterized in that, include: Tube body (100), traction wire (200) and adjusting 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 sections (1110) connected end to end in sequence, the axis of rotation of any two adjacent rotating sections (1110) is perpendicular to the extension direction of the bending section (110) and parallel to each other, and the spiral support sleeve (112) is sleeved in the base layer (111); The adjusting handle (300) is connected to the end of the tube (100) away from the bending section (110). One end of the traction wire (200) is connected to the end of the tube (100) away from the adjusting handle (300), and the other end is connected to the adjusting handle (300). The adjusting handle (300) is used to pull the traction wire (200) to bend the bending section (110).
2. The microcatheter (1) according to claim 1, characterized in that, The spiral support sleeve (112) is made of elastic wire that extends in a cylindrical spiral.
3. The microcatheter (1) according to claim 2, characterized in that, The cross-sectional size of the elastic wire gradually decreases in the direction from the adjusting handle (300) toward the tube (100).
4. 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 disposed in the housing (310), the knob (320) is threadedly connected to the slider (330), and the traction wire (200) is connected to the slider (330).
5. The microcatheter (1) according to claim 4, characterized in that, The adjustment handle (300) also includes a locking key (340), which is slidably connected to the housing (310). The locking key (340) has a protrusion on the side facing the knob (320), and the knob (320) has multiple grooves. When the protrusion is inserted into any of the grooves, the locking key (340) restricts the knob (320) from rotating relative to the housing (310).
6. The microcatheter (1) according to claim 1, characterized in that, In the extension direction of the bending section (110), one end of the rotating joint (1110) is provided with a recess (1111) and the other end is provided with a protrusion (1112). The protrusion (1112) is embedded in the recess (1111) of the adjacent rotating joint (1110) so that the two adjacent rotating joints (1110) are rotatably connected.
7. The microcatheter (1) according to claim 6, characterized in that, The sidewall of the recessed portion (1111) facing the protrusion (1112) is a first arc surface, and the sidewall of the protrusion (1112) facing the recessed portion (1111) is a second arc surface. The second arc surface is fitted inside the first arc surface, and the second arc surface slides in conjunction with the first arc surface.
8. The microcatheter (1) according to claim 1, characterized in that, The number of traction wires (200) is two, and the two traction wires (200) are respectively located on 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 sections (1110).
9. The microcatheter (1) according to claim 1, characterized in that, The tube body (100) also includes a straight section (120); the straight section (120) is located on the side of the bending section (110) away from the adjusting handle (300), and the straight section (120) is provided with a traction ring (121), and the traction wire (200) is connected to the traction ring (121).
10. The microcatheter (1) according to claim 1, characterized in that, The tube body (100) also includes a torque control support section (130), which is located between the bending section (110) and the adjusting handle (300).