Laser surgical catheter

Abstract

This invention discloses a laser surgical catheter, comprising an outer sheath with a first opening, an inner sheath inserted within the outer sheath and movable along its axial direction, an optical fiber inserted within the inner sheath and movable along its axial direction, and at least two support claws. All support claws are spaced apart circumferentially along the inner sheath and connected to the side of the inner sheath near the first opening. Each support claw has a support protrusion, and all support protrusions together define a support channel. The diameter of the largest inscribed circle of the support channel is smaller than the diameter of the optical fiber. According to this invention, the optical fiber can push the support claws against the inner wall of the patient's catheter, fixing them relative to the patient's catheter wall. The support protrusions clamp the optical fiber, allowing the optical fiber to be precisely aligned with any obstruction. This reliably removes obstructions from the patient's catheter wall, reducing the risk of damage to the patient's catheter wall due to laser irradiation and improving the reliability of the laser surgical catheter.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a laser surgical catheter. Background Technology

[0002] Fallopian tube obstruction has become a major cause of infertility. Currently, laser-induced cavitation vacuolation therapy is a treatment option with significant advantages and effectiveness for fallopian tube obstruction. This method involves transmitting laser energy through optical fibers to the vicinity of the obstruction, inducing local cavitation. When the cavitation bubbles collapse, they generate strong shock waves and microjets, thereby removing the fallopian tube obstruction. Similar treatment methods have also been applied to the treatment of kidney stones and urinary stones, demonstrating their effectiveness.

[0003] However, because the fallopian tube is a long, narrow tubular muscular tissue with finely structured cilia on its walls, this method of treating fallopian tube obstruction can cause the internal cavity to narrow and twist due to the soft changes in the tissue structure. As a result, the laser energy may irradiate the surrounding tubal wall tissue, or the shock jet generated by cavitation bubbles may deviate from the lesion tissue. Therefore, a fixation device is needed to fix the optical fiber in the center of the fallopian tube and provide some support to the fallopian tube wall, thereby preventing damage to the fallopian tube wall when the cavitation bubbles collapse. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a laser surgical catheter that utilizes an optical fiber to push a supporting claw against the inner wall of the patient's catheter, thus fixing it relative to the patient's catheter wall. The optical fiber is held in place by a supporting protrusion, allowing for precise alignment of the optical fiber with any obstruction. This reliably removes obstructions from the patient's catheter wall, reduces the risk of damage to the patient's catheter wall caused by laser irradiation, and improves the reliability of the laser surgical catheter.

[0005] A laser surgical catheter according to an embodiment of the present invention includes: an outer sheath having a first channel, the first channel having a first opening at one end in the axial direction of the outer sheath; an inner sheath having a second channel and movably inserted into the first channel along the axial direction of the outer sheath; an optical fiber movably inserted into the second channel along the axial direction of the outer sheath; at least two support claws, all of the support claws being circumferentially spaced along the inner sheath and connected to the side of the inner sheath near the first opening, each support claw having a support protrusion on the side facing the second channel, all the support protrusions collectively defining a support channel, the diameter of the largest inscribed circle of the support channel being smaller than the diameter of the optical fiber, so that when the optical fiber passes through the support channel, it compresses the support claw to expand radially outward toward the inner sheath; wherein, the inner sheath is used to drive the support claws to extend out of the first channel and drive the support claws to retract into the first channel.

[0006] According to this invention, a laser surgical catheter is provided with multiple support claws spaced circumferentially along the inner sleeve. The support protrusions of the multiple support claws define a support channel with a diameter smaller than that of the optical fiber. When using the laser surgical catheter for laser-induced cavitation bubble treatment, when the front end of the laser surgical catheter reaches a preset position, the inner sleeve can be driven to move towards the first opening, pushing the support claws out of the first channel. Then, the optical fiber is pushed through the support channel. The optical fiber pushes the support claws to abut against the inner wall of the patient's catheter, fixing them relative to the patient's catheter wall. The support protrusions hold the optical fiber, allowing the optical fiber to be more accurately aligned with the obstruction. This reliably removes the obstruction from the patient's catheter wall, reduces the risk of damage to the patient's catheter wall caused by laser irradiation, and improves the reliability of the laser surgical catheter.

[0007] According to some embodiments of the present invention, the support claw includes a first support arm and a second support arm connected axially along the outer sleeve. The first support arm is connected between the second support arm and the inner sleeve. In a direction away from the inner sleeve, the first support arm extends radially inward toward the second channel, and the second support arm extends radially outward toward the second channel.

[0008] In some embodiments of this utility model, a portion of the support claw is disposed within the second channel and connected to the radial inner surface of the inner sleeve. The inner sleeve has a first movement position and a second movement position relative to the outer sleeve. In the first movement position, the entire support claw is retracted into the first channel. In the second movement position, the second support arm extends out of the first channel. The optical fiber has a third movement position and a fourth movement position relative to the inner sleeve. In the third movement position, the optical fiber is located on the side of the support protrusion closer to the inner sleeve. In the fourth movement position, the optical fiber passes through the support channel, and the head of the optical fiber is located on the side of the free end of the second support arm closer to the inner sleeve. The first support arm abuts against the radial inner surface of the inner sleeve.

[0009] In some embodiments of this utility model, the first support arm includes a limiting section and a first protruding section. The limiting section is connected between the inner sleeve and the first protruding section. The first protruding section is connected to the second support arm. In a direction away from the inner sleeve, the first protruding section extends radially inward toward the second channel. When the optical fiber is in the fourth movement position, the limiting section abuts against the radial inner surface of the inner sleeve, and the first protruding section extends out of the first channel.

[0010] According to some other embodiments of the present invention, the dimension of the first support arm in the radial direction of the inner sleeve gradually increases in the direction away from the inner sleeve.

[0011] According to some embodiments of the present invention, the second support arm includes a second protruding section and a support section. The second protruding section is connected between the support section and the first support arm. In a direction away from the inner sleeve, the second protruding section extends radially outward toward the second channel, and the support section extends axially along the outer sleeve.

[0012] According to some optional embodiments of the present invention, the inner sleeve includes a front end section and a main body section arranged axially and detachably connected, and the support claw is connected to the front end section.

[0013] According to some alternative embodiments of the present invention, in a direction away from the inner sleeve, all of the support claws are located outside the second channel and connected to the end face of the inner sleeve in its axial direction.

[0014] According to some alternative embodiments of the present invention, there are at least three support claws, and the triangle formed by connecting at least three support claws on the cross-section of the inner sleeve is an acute triangle.

[0015] According to some specific embodiments of this utility model, the support claw is a polytetrafluoroethylene part; or, the support claw is a stainless steel part.

[0016] According to some specific embodiments of this utility model, the outer sleeve is a polyvinyl chloride component.

[0017] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a laser surgical catheter according to some embodiments of the present invention, wherein the inner sheath is located in the second movement position and the optical fiber is located in the fourth movement position;

[0020] Figure 2 yes Figure 1 A schematic diagram of a laser surgical catheter, in which the inner sheath is located in the second movement position and the optical fiber is hidden;

[0021] Figure 3 yes Figure 1 A schematic diagram of a laser surgical catheter, in which the inner sheath is located in the first moving position and the optical fiber is hidden;

[0022] Figure 4 yes Figure 1 A schematic diagram of the structure when the inner sleeve is connected to the support claw;

[0023] Figure 5 yes Figure 1 A schematic diagram of the support claw structure.

[0024] Figure label:

[0025] 100. Laser surgical catheter;

[0026] 1. Outer tube; 11. First channel; 12. First opening;

[0027] 2. Inner sleeve; 21. Second channel;

[0028] 3. Support claw; 31. Support protrusion; 32. Support channel; 33. First support arm; 331. Limiting section; 332. First protrusion section; 34. Second support arm; 341. Second protrusion section; 342. Support section;

[0029] 4. Optical fiber. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] The laser surgical catheter 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0032] Reference Figures 1-5 According to an embodiment of the present invention, the laser surgical catheter 100 includes: an outer sleeve 1, an inner sleeve 2, and a support claw 3. The outer sleeve 1 has a first channel 11, and one end of the first channel 11 in the axial direction has a first opening 12. The inner sleeve 2 has a second channel 21, and the inner sleeve 2 passes through the first channel 11. The inner sleeve 2 is movable along the axial direction of the outer sleeve 1, that is, the inner sleeve 2 can move relative to the outer sleeve 1 in its axial direction. In other words, the inner sleeve 2 and the outer sleeve 1 are clearance-fitted. The inner diameter of the outer sleeve 1 is larger than the outer diameter of the inner sleeve 2. Specifically, the difference between the inner diameter of the outer sleeve 1 and the outer diameter of the inner sleeve 2 is greater than or equal to 0.1 mm and less than or equal to 10 mm.

[0033] Reference Figure 1 The optical fiber 4 is inserted in the second channel 21 and is movable along the axial direction of the outer tube 1; for example, the device for laser-induced cavitation bubble treatment has a laser emitting device, and the end of the optical fiber 4 away from the first opening 12 is connected to the output port of the laser emitting device to guide the laser emitted by the laser emitting device to its end near the first opening 12.

[0034] Reference Figures 1-4 There are at least two support claws 3. For example, there can be two, three, four, five, six or more support claws 3. All support claws 3 are arranged at intervals along the circumference of the inner sleeve 2, that is, all support claws 3 are arranged in a ring and adjacent two are spaced apart in the arrangement direction. For example, all support claws 3 can be evenly spaced, that is, the distance between any two adjacent support claws 3 in the arrangement direction is the same.

[0035] All support claws 3 are connected to the side of the inner sleeve 2 near the first opening 12. For example, the support claws 3 can be connected to the inner sleeve 2 by rivets or bolts, or the support claws 3 can be integrally formed with the inner sleeve 2. For example, the support claws 3 can be connected to the end of the inner sleeve 2 near the first opening 12, or the support claws 3 can be partially disposed in the second channel 21 and connected to the radial inner surface of the inner sleeve 2.

[0036] Each support claw 3 has a support protrusion 31 on the side facing the second channel 21. All support protrusions 31 together define the support channel 32. The diameter of the largest inscribed circle of the support channel 32 is smaller than the diameter of the optical fiber 4, so that when the optical fiber 4 passes through the support channel 32, it squeezes the support claw 3 to expand radially outward toward the inner sleeve 2; that is, when the optical fiber 4 extends into the support channel 32, the optical fiber 4 and the support protrusion 31 stop in the radial direction of the inner sleeve 2.

[0037] The inner sleeve 2 is used to drive the support claw 3 to extend out of the first channel 11 and to drive the support claw 3 to retract into the first channel 11.

[0038] When the laser surgical catheter 100 reaches the preset position, the inner sheath 2 can be driven to move toward the first opening 12, pushing the support claw 3 out of the first channel 11. Then, the optical fiber 4 is pushed through the support channel 32, and the optical fiber 4 is used to squeeze the support claw 3 to expand radially outward toward the inner sheath 2, pushing the support claw 3 to stop against the inner wall of the patient's tube (wherein, the patient's tube wall can be the wall of the fallopian tube, the wall of the ureter, or the wall of a blood vessel), so as to fix the support claw 3 relative to the patient's tube wall. This allows the support claw 3 to play a certain protective role for the patient's tube wall, reducing the risk of damage to the patient's tube wall caused by the shock wave or microjets generated by the collapse of cavitation bubbles, improving the reliability of the laser surgical catheter 100, and improving the safety of laser-induced cavitation bubble treatment surgery.

[0039] Simultaneously, as the fiber 4 compresses the support claw 3 and expands radially outward toward the inner sleeve 2, the support protrusion 31 can clamp the fiber 4, allowing the head of the fiber 4 to be approximately located at the center of the support channel 32, the center of the multiple support claws 3, and the center of the patient's tube wall. This allows laser energy to be reliably transmitted to the vicinity of the obstruction through the fiber 4, enabling the shock wave or microjets generated by cavitation bubble collapse to act more precisely on the obstruction, thereby removing the obstruction, reducing the risk of damage to the patient's tube wall caused by the shock wave or microjets generated by cavitation bubble collapse, improving the reliability of the laser surgical catheter 100, and enhancing the safety of laser-induced cavitation bubble treatment surgery.

[0040] It should be understood that, in order to avoid the optical fiber 4 extending too far out of the support channel 32 and losing the support of the support protrusion 31, the distance between the head of the optical fiber 4 and the position where the support protrusion 31 abuts against the optical fiber 4 should be relatively short. For example, after pushing the head of the optical fiber 4 through the support channel 32, it is not necessary to continue pushing, or only push the optical fiber 4 a small distance. However, in order to ensure that the laser energy transmitted through the optical fiber 4 can reliably remove the obstruction, the head of the optical fiber 4 should be pushed as close to the obstruction as possible, that is, as far away from the position where the support protrusion 31 abuts against the optical fiber 4 as possible. Therefore, when actually pushing the optical fiber 4, the head of the optical fiber 4 can be pushed to a position roughly flush with the end of the support claw 3 away from the inner sleeve light, so as to ensure that the head of the optical fiber 4 can be reliably located in the center of the tube wall, and at the same time, ensure that the laser energy transmitted through the optical fiber 4 can reliably remove the obstruction.

[0041] For example, to prevent the laser surgical catheter 100 from scratching the patient's tube wall, the edges of the outer tube 1, inner tube 2 and support claw 3 can be rounded. Specifically, the end face of the support claw 3 away from the inner tube 2 in the axial direction of the outer tube 1 can be formed into a sphere, and its diameter can be set to be greater than or equal to 1 mm and less than or equal to 20 mm.

[0042] For example, when selecting materials, a softer material can be chosen to make the outer tube 1 to reduce the risk of the outer tube 1 scratching the patient's tube wall. Specifically, the outer tube 1 can be made of polyvinyl chloride.

[0043] According to the laser surgical catheter 100 of this utility model, multiple support claws 3 are arranged at circumferential intervals along the inner sleeve 2, and the support protrusions 31 of the multiple support claws 3 define a support channel 32 with a diameter smaller than that of the optical fiber 4. When using the laser surgical catheter 100 for laser-induced cavitation bubble treatment, when the front end of the laser surgical catheter 100 reaches the preset position, the inner sleeve 2 can be driven to move toward the first opening 12, pushing the support claws 3 out of the first channel 11, and then pushing the optical fiber 4 through the support channel 32. The optical fiber 4 pushes the support claws 3 to stop against the inner wall of the patient's tube wall to fix them relative to the patient's tube wall, and the support protrusions 31 clamp the optical fiber 4 so that the optical fiber 4 can be more accurately aligned with the obstruction, thereby reliably removing the obstruction in the patient's tube wall, reducing the risk of damage to the patient's tube wall caused by laser irradiation, and improving the reliability of the laser surgical catheter 100.

[0044] Reference Figures 2-5According to some embodiments of the present invention, the support claw 3 includes a first support arm 33 and a second support arm 34. In the axial direction of the outer sleeve 1, the first support arm 33 connects the second support arm 34 to the inner sleeve 2. In the direction away from the inner sleeve 2, the first support arm 33 extends radially inward toward the second channel 21, and the second support arm 34 extends radially outward toward the second channel 21. That is, the first support arm 33 and the second support arm 34 extend in opposite directions radially toward the second channel 21, forming an angled structure with a protrusion toward the radially inward side of the second channel 21. The support protrusion 31 includes a portion of the first support arm 33 and a portion of the second support arm 34.

[0045] By setting the first support arm 33 to extend radially inward toward the second channel 21 in a direction away from the inner sleeve 2, the first support arm 33 can guide the optical fiber 4 when the optical fiber moves from the third movement position to the fourth movement position, so that the optical fiber 4 can reliably pass into the support channel 32 along the guide of the first support arm 33.

[0046] By setting the second support arm 34 to extend radially outward toward the second channel 21 in a direction away from the inner sleeve 2, when the support claw 3 is retracted into the first channel 11, the tube wall at the first opening 12 of the outer sleeve 1 can slide relative to the second support claw 3, gradually squeezing the second support arm 34 toward the radial inward of the second channel 21, so that the second support arm 34 can be reliably retracted into the first channel 11.

[0047] Meanwhile, the first support arm 33 and the second support arm 34 are set to extend in opposite directions in the radial direction of the second channel 21, so that the first support arm 33 and the second support arm 34 form an angle gap in the direction away from the second channel 21, so that the support claw 3 has a certain deformation space, which facilitates the clamping of the optical fiber 4 by the support claw 3 when the optical fiber 4 passes through the support channel 32. The structure is simple and reliable.

[0048] Reference Figures 1-4 In some embodiments of this utility model, a portion of the support claw 3 is disposed within the second channel 21, and the support claw 3 is connected to the radial inner surface of the inner sleeve 2. The inner sleeve 2 has a first moving position and a second moving position relative to the outer sleeve 1, as shown in the figure. Figure 3 In the first movement position, the support claw 3 is fully retracted into the first channel 11; refer to Figure 1 and Figure 2 In the second movement position, the second support arm 34 extends out of the first channel 11; for example, in the second movement position, the first support arm 33 may not extend out of the first channel 11, or the first support arm 33 may only extend partially out of the first channel 11.

[0049] Reference Figure 1 The optical fiber 4 has a third movement position and a fourth movement position relative to the inner sleeve 2. In the third movement position, the optical fiber 4 is located on the side of the support protrusion 31 near the inner sleeve 2. In the fourth movement position, the optical fiber 4 passes through the support channel 32, and the head of the optical fiber 4 is located on the side of the free end of the second support arm 34 near the inner sleeve 2. The first support arm 33 abuts against the radial inner surface of the inner sleeve 2; that is, the part of the first support arm 33 located in the second channel 21 abuts against the inner surface of the inner sleeve 2, that is, the first support arm 33 abuts against the inner wall of the second channel 21.

[0050] It should be explained that the free end of the second support arm 34 refers to the end of the second support arm 34 that is not connected to the first support arm 33 in the axial direction of the outer sleeve 1, that is, the end of the second support arm 34 that is away from the first support arm 33 in the axial direction of the outer sleeve 1. The head of the optical fiber 4 refers to the end of the optical fiber 4 that is close to the first opening 12 in its axial direction when in the third movement position.

[0051] By setting the first support arm 33 to abut against the radial inner surface of the inner sleeve 2 when the optical fiber 4 passes through the support channel 32, the inner sleeve 2 can limit the first support arm 33. When the first support arm 33 abuts against the radial inner surface of the inner sleeve 2, the support claw 3 can expand only the second support arm 34 towards the radial outer side of the first channel 11, making the calculation of the distance the second support arm 34 expands outward in the radial direction of the first channel 11 simpler.

[0052] Specifically, the distance of the first support arm 33 extending in the axial direction of the outer tube 1 is L1, the distance of the second support arm 34 extending in the axial direction of the outer tube 1 is L2, the difference between the diameter of the largest inscribed circle of the support channel 32 and the diameter of the optical fiber 4 is Δx, and in the fourth movement position, the distance by which the second support arm 34 expands outward in the radial direction of the first channel 11 is ΔL, where ΔL=Δx(L1+L2) / L1.

[0053] Furthermore, by setting the first support arm 33 to abut against the radial inner surface of the inner sleeve 2 when the optical fiber 4 passes through the support channel 32, and the second support arm 34 abutting against the patient's tube wall, the second support arm 34 can be mutually limited with the inner sleeve 2 through the first support arm 33, so that the laser surgical catheter 100 is reliably fixed relative to the patient's tube wall.

[0054] Optionally, the support claws 3 can all be located inside and outside the second channel 21, and the support claws 3 are connected to the end face of the inner tube 2 in its axial direction. So that when the second support arm 34 abuts against the patient's tube wall, the second support arm 34, through the first support arm 33, mutually limits the outer tube 1. By using the outer tube 1 to limit the inner tube 2, the laser surgical catheter 100 is reliably fixed relative to the patient's tube wall.

[0055] Reference Figures 2-5 In some embodiments of this utility model, the first support arm 33 includes a limiting section 331 and a first protruding section 332. The limiting section 331 is connected between the inner sleeve 2 and the first protruding section 332. The first protruding section 332 is connected to the second support arm 34. In the direction away from the inner sleeve 2, the first protruding section 332 extends radially inward toward the second channel 21.

[0056] When the optical fiber 4 is in the fourth moving position, the limiting segment 331 abuts against the radial inner surface of the outer tube 1, that is, the surface of the limiting segment 331 away from the second channel 21 abuts against the radial inner surface of the outer tube 1, and the first protruding segment 332 extends out of the first channel 11.

[0057] By setting the first protruding section 332 to extend out of the first channel 11, the first protruding section 332 can have a large deformation space, which allows the second support arm 34 to have a large expansion space in the radial direction of the outer sleeve 1, so that the second support arm 34 can reliably abut against the patient's tube wall, thereby improving the reliability of the laser surgical catheter 100.

[0058] Reference Figure 5 According to some other embodiments of the present invention, the dimension of the first support arm 33 in the radial direction of the inner sleeve 2 gradually increases in the direction away from the inner sleeve 2. That is, in the axial direction of the outer sleeve 1, the end of the first support arm 33 connected to the inner sleeve 2 has the smallest dimension in the radial direction of the inner sleeve 2. This facilitates the relative rotation of the first support arm 33 relative to the inner sleeve 2. When the first support arm 33 abuts against the radial inner surface of the outer sleeve 1, this allows the surface of the first support arm 33 toward the second channel 21 to extend radially inward toward the second channel 21 in the direction away from the inner sleeve 2, guiding the movement of the optical fiber 4 from the third movement position to the fourth movement position, thus realizing the guiding role of the support claw 3 on the movement of the optical fiber 4.

[0059] Reference Figures 2-5According to some embodiments of the present invention, the second support arm 34 includes a second protruding section 341 and a support section 342. The second protruding section 341 is connected between the support section 342 and the first support arm 33. In the direction away from the inner sleeve 2, the second protruding section 341 extends radially outward toward the second channel 21, and the support section 342 extends axially along the outer sleeve 1. For example, the first protruding section 332 and the second protruding section 341 together constitute the support protrusion 31 of the support claw 3.

[0060] This allows the surface of the support section 342, which is radially away from the first channel 11, to be roughly parallel to the patient's tube wall, resulting in a larger contact area between the support section 342 and the patient's tube wall. This reliably achieves the purpose of fixing the support claw 3 relative to the patient's tube wall, thereby improving the reliability of the laser surgical catheter 100.

[0061] Reference Figures 1-4 According to some alternative embodiments of the present invention, there are at least three support claws 3, and the triangle formed by connecting at least three support claws 3 on the cross-section of the inner sleeve 2 is an acute triangle. This makes the clamping of the optical fiber 4 by the multiple support claws 3 more reliable, so that the optical fiber 4 can be reliably fixed relative to the outer sleeve 1 under the clamping of the support claws 3, thereby improving the reliability of the laser surgical catheter 100.

[0062] According to some specific embodiments of this utility model, the support claw 3 is made of polytetrafluoroethylene; this allows the support claw 3 to have a certain degree of self-lubrication, enabling the support claw 3 to reliably extend and retract into the first channel 11, reducing the damage to the patient's tube wall caused by the support claw 3, and improving the safety of laser-induced cavitation bubble treatment surgery.

[0063] According to some specific embodiments of this utility model, the support claw 3 is made of stainless steel. This allows the support claw 3 to have high structural strength, enabling it to protect the patient's tube wall and effectively reduce or avoid the risk of damage to the patient's tube wall caused by shock waves or microjets generated by cavitation bubble collapse, thereby improving the reliability of the laser surgical catheter 100. For example, when using the laser surgical catheter 100 to treat a patient's kidney stones, the support claw 3 can be made of stainless steel so that it can withstand the impact energy generated by cavitation bubble collapse.

[0064] According to some optional embodiments of the present invention, the inner sleeve 2 includes a front end section and a main body section, which are arranged along the axial direction of the inner sleeve 2. The front end section and the main body section are detachably connected, and the support claw 3 is connected to the front end section. For example, the front end section and the main body section can be connected by a snap-fit ​​or by a threaded connection.

[0065] This design allows the front end section and support claw 3 to be replaced as a whole, making the material of support claw 3 replaceable. For example, when treating a patient's kidney stones, the front end section of support claw 3, which is made of stainless steel, can be connected to the main body section. When treating a patient's fallopian tube obstruction, the front end section of support claw 3, which is made of PTFE, can be connected to the main body section.

[0066] In the description of this utility model, it should be understood that relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A laser surgical catheter, characterized by, include: The outer tube has a first channel, and the first channel has a first opening at one end of the outer tube in the axial direction; The inner sleeve has a second channel and is movably inserted into the first channel along the axial direction of the outer sleeve; An optical fiber is movably inserted into the second channel along the axial direction of the outer sheath; At least two support claws are provided, all of which are circumferentially spaced along the inner sleeve and connected to the side of the inner sleeve near the first opening. Each support claw has a support protrusion on the side facing the second channel. All the support protrusions together define a support channel. The diameter of the largest inscribed circle of the support channel is smaller than the diameter of the optical fiber, so that when the optical fiber passes through the support channel, it squeezes the support claw to expand radially outward toward the inner sleeve. The inner sleeve is used to drive the support claw to extend out of the first channel and to drive the support claw to retract into the first channel.

2. The laser surgical catheter according to claim 1, characterized in that, The support claw includes a first support arm and a second support arm connected axially along the outer sleeve. The first support arm is connected between the second support arm and the inner sleeve. In a direction away from the inner sleeve, the first support arm extends radially inward toward the second channel, and the second support arm extends radially outward toward the second channel.

3. The laser surgical catheter according to claim 2, characterized in that, A portion of the support claw is disposed within the second channel and connected to the radial inner surface of the inner sleeve. The inner sleeve has a first movement position and a second movement position relative to the outer sleeve. In the first movement position, the entire support claw is retracted into the first channel. In the second movement position, the second support arm extends out of the first channel; The optical fiber has a third movement position and a fourth movement position relative to the inner sleeve. In the third movement position, the optical fiber is located on the side of the support protrusion close to the inner sleeve. In the fourth movement position, the optical fiber passes through the support channel, and the head of the optical fiber is located on the side of the free end of the second support arm close to the inner sleeve. The first support arm abuts against the radial inner surface of the inner sleeve.

4. The laser surgical catheter according to claim 3, characterized in that, The first support arm includes a limiting section and a first protruding section. The limiting section is connected between the inner sleeve and the first protruding section. The first protruding section is connected to the second support arm. In a direction away from the inner sleeve, the first protruding section extends radially inward toward the second channel. When the optical fiber is in the fourth moving position, the limiting segment abuts against the radial inner surface of the inner sleeve, and the first protruding segment extends out of the first channel.

5. The laser surgical catheter according to claim 2, characterized in that, In the direction away from the inner sleeve, the dimension of the first support arm gradually increases in the radial direction of the inner sleeve.

6. The laser surgical catheter according to claim 2, characterized in that, The second support arm includes a second protruding section and a support section. The second protruding section is connected between the support section and the first support arm. In a direction away from the inner sleeve, the second protruding section extends radially outward toward the second channel. The support section extends axially along the outer sleeve.

7. The laser surgical catheter according to any one of claims 1-6, characterized in that, The inner sleeve includes a front end section and a main body section that are detachably connected and arranged along its axial direction, and the support claw is connected to the front end section.

8. The laser surgical catheter according to any one of claims 1-6, characterized in that, All of the support claws are located outside the second channel and connected to the axial end face of the inner sleeve.

9. The laser surgical catheter according to any one of claims 1-6, characterized in that, There are at least three support claws, and on the cross-section of the inner sleeve, the triangle formed by connecting at least three support claws is an acute triangle. Alternatively, the support claw may be made of polytetrafluoroethylene (PTFE). Alternatively, the support claw may be made of stainless steel.

10. The laser surgical catheter according to any one of claims 1-6, characterized in that, The outer sleeve is made of polyvinyl chloride.

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