Micro catheter
By embedding the hyperbaric tube in the support section of the microcatheter, the problem of deformation of the support section during the bending process in the prior art is solved, and the position of the microcatheter in the blood vessel is stabilized and the effect of adapting to changes in the shape of the blood vessel is achieved.
Patent Information
- Application Number
- CN202421675307.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-16
AI Technical Summary
When the existing adjustable bend microcatheter is working, the microcatheter tube body will bend with the bend control of the head end, causing the position of the microcatheter in the blood vessel to change.
A micro-conduit is designed, and a hypotube with a certain supporting rigidity is embedded in the support section. When the curve is adjusted and bent at the distal end of the micro catheter, the hyperbar tube plays a supporting role on the support section of the catheter body to prevent the support section from deformation during the curve.
By inserting hyperbaric tubes, the support section of the microcatheter remains unchanged when the bent section is bent, avoiding the change in the position of the microcatheter in the blood vessel. At the same time, the flexibility of the hyperbaric tube allows the microcatheter to adapt to changes in the shape of the blood vessel.
Smart Images
Figure CN223009603U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a microcatheter. Background Art
[0002] Interventional therapy is a technology that realizes the diagnosis and treatment of diseases with minimal trauma. Generally, under the guidance of imaging (such as X-Ray, CT, US or MRI, etc.), a microcatheter is sent to the target position in the body to achieve local diagnosis and treatment of diseases, such as delivering implants or collecting biological information. In interventional diagnosis and treatment, quickly and safely delivering the microcatheter to the target organ is a key element for realizing interventional therapy. Microcatheters often need to precisely control the distal end (and tip) to pass through tortuous positions or perform precise spatial position determination. Therefore, adjustable-bend microcatheters have been widely used. An adjustable-bend microcatheter means that an adjustable-bend section is arranged at the distal end of the catheter body of the microcatheter. By manipulating the handle of the microcatheter to drive the traction wire connected to the adjustable-bend section to move axially, the distal end of the catheter body can be bent repeatedly at different angles until the bending angle conforms to the specific physiological structure characteristics of the human lumen. Then, the bending angle is locked, the distal end of the catheter body is aligned with the entrance of the target lumen (such as a certain blood vessel), and then diagnostic and / or therapeutic instruments are delivered to the target lumen through the catheter body. That is, an adjustable-bend microcatheter is a microcatheter with a remotely adjustable bend. Doctors can bend the distal end of the microcatheter to different angles in the patient's body through external adjustment operations to adapt to different anatomical structures.
[0003] However, when the currently used adjustable-bend microcatheter is working, the catheter body of the microcatheter will present an arcuate bend along with the bend control of the head end, causing the position of the microcatheter in the blood vessel to change. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a microcatheter in which the support section does not deform along with the adjustment of the bend section for the problems in the prior art.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A microcatheter includes a catheter body. The catheter body includes an adjustable-bend section arranged at the distal end and a support section sequentially connected to the proximal end of the adjustable-bend section at the distal end. The microcatheter further includes a hypotube embedded in the side wall of the support section. The hypotube extends along the length direction of the support section. A cutting slit is arranged on the hypotube. On the axial projection plane of the hypotube, the extending direction of the cutting slit faces the bending direction of the adjustable-bend section.
[0007] In some embodiments, the cutting slits include a first cutting slit and a second cutting slit respectively arranged on opposite sides of the sea wave tube, the first cutting slit and the second cutting slit both extend along the circumferential direction of the sea wave tube, and a plurality of the first cutting slits and the second cutting slits are arranged at intervals along the length extension direction of the sea wave tube, and the first cutting slit and the second cutting slit are staggered in the length extension direction of the sea wave tube.
[0008] In some embodiments, there is a gap between adjacent ends of the first cutting slit and the second cutting slit, and the gap is 0.06-0.1 mm.
[0009] In some embodiments, the hypotubes are symmetrically disposed on opposite sides of the support segment.
[0010] In some embodiments, the hypotube is made of nickel-titanium alloy material.
[0011] In some embodiments, a channel extending along the length direction of the catheter body is provided on the side wall of the catheter body, and the microcatheter also includes a traction wire for controlling the bending of the bending adjustment section. The traction wire is movably arranged in the channel, the distal end of the traction wire is fixedly arranged on the bending adjustment section, and the proximal end of the traction wire is arranged on the handle assembly after passing through the channel.
[0012] In some embodiments, the channels are symmetrically arranged on opposite sides of the catheter body, and the traction wires are correspondingly fixedly arranged on opposite sides of the bending adjustment section and respectively passed through the channels on the corresponding sides.
[0013] In some embodiments, the hypotubes are symmetrically disposed on opposite sides of the support segment, and the hypotubes and the channels are spaced 90 degrees apart in the circumferential direction of the catheter body.
[0014] In some embodiments, the microcatheter also includes a developing piece, which is a ring-shaped structure. The bending section includes an inner tube and an outer tube sleeved outside the inner tube. The developing piece is embedded between the inner tube and the outer tube, and the traction wire is fixedly arranged on the outer peripheral surface of the developing piece.
[0015] In some embodiments, the catheter body further comprises a transition section disposed at the distal end, the proximal end of the transition section is sequentially connected to the distal end of the bending section, and the distal end of the transition section has an arc chamfer;
[0016] The catheter body also includes a connecting section arranged at the proximal end, the connecting section is connected to the handle assembly, and the distal end of the connecting section is sequentially connected to the proximal end of the supporting section.
[0017] Due to the application of the above technical solution, the microcatheter of the utility model has the following advantages compared with the prior art: the microcatheter of the utility model has a hypotube with a certain support rigidity embedded in the support section, and when the bending section at the distal end of the microcatheter is bent, the hypotube plays a supporting role for the support section of the catheter body, thereby avoiding the problem that the support section also deforms and presents an arch shape when the bending section is bent, so that the position of the support section in the blood vessel will not change. At the same time, the hypotube also has a certain degree of flexibility, so that the support section of the catheter body of the microcatheter has a bending effect during the transportation process, and can adapt to the changes in the shape of the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a three-dimensional schematic diagram of the microcatheter of this embodiment (without the handle assembly);
[0019] Figure 2 is a front view schematic diagram of the microcatheter of this embodiment (without the handle assembly);
[0020] Figure 3 for Figure 2 A schematic cross-sectional view along line AA;
[0021] Figure 4 for Figure 3 A partial enlarged schematic diagram in the middle;
[0022] Figure 5 for Figure 2 The schematic cross-sectional view along line BB;
[0023] Figure 6 for Figure 2 A schematic cross-sectional view along line CC;
[0024] Figure 7 Schematic top view of the microcatheter of this embodiment (without the handle assembly);
[0025] Figure 8 for Figure 7 A schematic cross-sectional view along line AA;
[0026] Figure 9 for Figure 8 A partial enlarged schematic diagram in the middle;
[0027] Figure 10 is a three-dimensional schematic diagram of a hypotube of this embodiment;
[0028] Figure 11 is a front view schematic diagram of the hypotube of this embodiment;
[0029] Figure 12 For attachment Figure 11 A partial enlarged schematic diagram in the middle.
[0030] Wherein: 1. Bending section; 11. Inner tube; 12. Outer tube; 2. Support section; 3. Transition section; 4. Connection section; 5. Corrugated tube; 51. First cutting seam; 52. Second cutting seam; 6. Traction wire; 7. Channel; 8. Imaging element. Detailed implementation manner
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. For example, Figure 8 in the figure, the left side direction in the figure is "left", the right side direction is "right", the upper side direction is "upper", the lower side direction is "lower", and the direction perpendicular to the paper surface in the figure is "front" and "rear". This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0033] Unless otherwise specified, the proximal end and the distal end mentioned in the present utility model have the same meaning in terms of orientation, that is, in the use state, the distal end is the end far from the operator, and the proximal end is the end close to the operator. The operator controls the microcatheter at the proximal end.
[0034] The microcatheter of this embodiment includes a catheter body, a traction assembly, and a handle assembly (not shown in the figure).
[0035] As Figures 1 - 3 and Figure 8 shown, the catheter body includes a bending section 1, a support section 2, a transition section 3, and a connection section 4. Along the length extension direction of the catheter body, the transition section 3, the bending section 1, the support section 2, and the connection section 4 are arranged in sequence from the distal end to the proximal end, that is, the distal end of the bending section 1 is sequentially connected to the proximal end of the transition section 3, the distal end of the support section 2 is sequentially connected to the proximal end of the bending section 1, and the distal end of the connection section 4 is sequentially connected to the proximal end of the support section 2.
[0036] The bending section 1 can be bent to different degrees under the traction of the traction assembly, so as to conform to the specific physiological structure characteristics of the human blood vessel.
[0037] The support segment 2 plays a major supporting role. The support segment 2 has a certain degree of flexibility, thus having a certain bending effect, so that the microcatheter can adapt to the shape changes of the blood vessels in the body during transportation. At the same time, the support segment 2 also needs to have a certain degree of rigidity, so that when the bending adjustment segment 1 is bent under the traction of the traction component, the support segment 2 can maintain its shape without changing, thereby not changing its position in the blood vessel.
[0038] like Figures 1 - 3 and Figure 8 As shown, the distal end of the transition section 3 has an arc-shaped chamfer, so that when the microcatheter enters the human blood vessel, the damage to the human blood vessel can be reduced.
[0039] The connecting section 4 is arranged in the handle assembly to realize the connection between the catheter body and the handle assembly.
[0040] In order to improve the rigidity of the support section 2 and thus improve its anti-bending performance so that the support section 2 maintains its shape when the bending adjustment section 1 is bent, a hypotube 5 is embedded in the side wall of the support section 2, and the hypotube 5 extends along the length direction of the support section 2. Figures 5 - 8 shown.
[0041] The hypotube 5 is provided with a cutting slit, and on the axial projection surface of the hypotube 5, the extending direction of the cutting slit is toward the bending direction of the bending adjustment section 1, so that after the hypotube 5 is provided in the support section 2, the bending adjustment section 1 can still bend to different degrees under the pulling of the traction assembly, that is, the setting of the hypotube 5 will not affect the bending performance of the bending adjustment section 1. Figure 8 and Figure 9 As shown, the cutting seam extends in the left-right direction, and the bending section 1 bends to the left or right under the pulling of the traction assembly, but does not bend forward or backward. When the bending section 1 needs to bend forward or backward, the microcatheter needs to be twisted 90° as a whole.
[0042] Specifically, Figures 10 - 12 As shown, the cutting slits include a first cutting slit 51 and a second cutting slit 52 , which are respectively arranged on opposite sides of the hypotube 5 , and both extend in the circumferential direction of the hypotube 5 .
[0043] On opposite sides of the hypotube 5 , a plurality of first cutting slits 51 and second cutting slits 52 are arranged at intervals along the length extension direction of the hypotube 5 , and the first cutting slits 51 and second cutting slits 52 are staggered along the length extension direction of the hypotube 5 .
[0044] like Figures 10 - 12 As shown, there is a gap between the adjacent ends of the first cutting slit 51 and the second cutting slit 52, and the gap value L is 0.06-0.1 mm, and preferably the gap value L is 0.08 mm.
[0045] The design of the cutting seam on the sea wave tube 5 makes the support section 2 have a certain flexibility, and at the same time has a certain rigidity in the direction perpendicular to the cutting seam, so that after the sea wave tube 5 is embedded in the side wall of the support section 2, the support section 2 can maintain its original bending performance while improving its anti-bending performance.
[0046] In this embodiment, the hypotubes 5 are symmetrically arranged on two opposite sides of the support section 2 .
[0047] The hypotube 5 is made of nickel-titanium alloy material, and the cutting seam is cut and formed by laser cutting technology.
[0048] like Figures 3 - 7 As shown, the traction assembly includes a traction wire 6, and a channel 7 extending along the length direction of the catheter body is provided on the side wall of the catheter body, and the two ends of the channel 7 respectively penetrate the distal end of the support section 2 and the proximal end of the connecting section 4, and the traction wire 6 is movably arranged in the channel 7, and the distal end of the traction wire 6 is fixedly arranged on the bending adjustment section 1, and the proximal end of the traction wire 6 is arranged on the handle assembly through the channel 7. By operating the handle assembly, when the traction wire 6 moves in the channel 7, the bending adjustment section 1 is bent, and the moving distance of the traction wire 6 in the channel 7 can be controlled by the handle assembly according to the need of the bending angle.
[0049] The channels 7 are symmetrically arranged on opposite sides of the catheter body, and the traction wires 6 are correspondingly fixedly arranged on opposite sides of the bending adjustment section 1, and are respectively passed through the channels 7 on the corresponding sides. That is, the microcatheter has a bidirectional bending function, specifically, when the traction wire 6 on one side is manipulated to move by the handle assembly, the bending adjustment section 1 can be controlled to bend to the side of the fixed position of the traction wire 6, and the traction wire 6 on the other side can be manipulated to make the bending adjustment section 1 straighten. Conversely, when the traction wire 6 on the other side is manipulated to move by the handle assembly, the bending adjustment section 1 can be controlled to bend to the side of the fixed position of the traction wire 6, and the traction wire 6 on one side can be manipulated to make the bending adjustment section 1 straighten.
[0050] In this embodiment, the hypotube 5 and the channel 7 are arranged 90 degrees apart in the circumferential direction. Figure 6 and Figure 7 shown.
[0051] The microcatheter further includes a developing member 8, which is disposed on the bending section 1 and is used for X-ray development marking to display the bending direction and degree of the bending section 1. The developing member 8 is generally an annular structure, but is not limited thereto, and may also be a sheet structure. The developing member 8 may be pressed or pasted on the outer circumferential surface of the bending section 1, or may be integrated into the tube wall of the bending section 1.
[0052] The material of the developing member 8 may be, but is not limited to, platinum, iridium, tantalum, noble metal alloys, and the like.
[0053] In this embodiment, ifFigures 3 - 5 As shown, the developing member 8 is of an annular structure. The bending adjustment section 1 includes an inner tube 11 and an outer tube 12 sleeved outside the inner tube 11. The developing member 8 is embedded between the inner tube 11 and the outer tube 12. The traction wire 6 is fixedly arranged on the outer circumferential surface of the developing member 8 by welding.
[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It should not be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims
1. A microcatheter, comprising a catheter body, wherein the catheter body comprises a bending adjustment section arranged at a distal end and a support section whose distal end is sequentially connected to the proximal end of the bending adjustment section, characterized in that: The microcatheter also includes a hypotube embedded in the side wall of the support section, the hypotube extends along the length direction of the support section, a cutting slit is provided on the hypotube, and on the axial projection surface of the hypotube, the extending direction of the cutting slit is toward the bending direction of the bending adjustment section.
2. The microcatheter according to claim 1, characterized in that: The cutting slits include a first cutting slit and a second cutting slit respectively arranged on opposite sides of the hypotube, the first cutting slit and the second cutting slit both extend along the circumferential direction of the hypotube, a plurality of the first cutting slits and the second cutting slits are arranged at intervals along the length extension direction of the hypotube, and the first cutting slit and the second cutting slit are staggered in the length extension direction of the hypotube.
3. The microcatheter according to claim 2, characterized in that: There is a gap between adjacent ends of the first cutting slit and the second cutting slit, and the gap is 0.06-0.1 mm.
4. The microcatheter according to claim 1, characterized in that: The hypotubes are symmetrically arranged on opposite sides of the supporting section.
5. The microcatheter according to claim 1, characterized in that: The hypotube is made of nickel-titanium alloy material.
6. The microcatheter according to claim 1, characterized in that: A channel extending along the length direction of the catheter body is provided on the side wall of the catheter body. The microcatheter also includes a traction wire for controlling the bending of the bending adjustment section. The traction wire is movably arranged in the channel, the distal end of the traction wire is fixedly arranged on the bending adjustment section, and the proximal end of the traction wire passes through the channel and is arranged on the handle assembly.
7. The microcatheter according to claim 6, characterized in that: The channels are symmetrically arranged on two opposite sides of the catheter body, and the traction wires are correspondingly fixedly arranged on two opposite sides of the bending adjustment section and respectively penetrated in the channels on the corresponding sides.
8. The microcatheter according to claim 7, characterized in that: The hypotubes are symmetrically arranged on opposite sides of the support section, and the hypotubes and the channels are arranged 90 degrees apart in the circumferential direction of the catheter body.
9. The microcatheter according to claim 6, characterized in that: The microcatheter also includes a developing piece, which is an annular structure. The bending section includes an inner tube and an outer tube sleeved outside the inner tube. The developing piece is embedded between the inner tube and the outer tube, and the traction wire is fixedly arranged on the outer peripheral surface of the developing piece.
10. The microcatheter according to claim 1, characterized in that: The catheter body further comprises a transition section arranged at the distal end, the proximal end of the transition section is sequentially connected with the distal end of the bending section, and the distal end of the transition section has an arc chamfer; The catheter body also includes a connecting section arranged at the proximal end, the connecting section is connected to the handle assembly, and the distal end of the connecting section is sequentially connected to the proximal end of the supporting section.