Catheters and medical devices

Abstract

The present invention discloses a catheter, comprising a tube body, wherein the tube body is a tapered tube, the tube body comprises an inner tube layer and an outer tube layer which are fixedly connected, the outer surface of the inner tube layer is fixedly connected to the inner surface of the outer tube layer, the inner tube layer is a soft layer, the tube body comprises an inner diameter variable section, a front annular skeleton is arranged in the inner tube layer of the inner diameter variable section, and the front annular skeleton can move in a radial direction toward the outer tube layer; the present invention also discloses a medical device, comprising the catheter as described above, which can improve the success rate of surgery.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a catheter and a medical device. Background Art

[0002] Acute ischemic stroke (AIS) usually occurs when an artery to the brain becomes blocked, which prevents fresh oxygenated blood from being delivered to the brain from the heart and lungs. These blockages are usually caused by a blood clot or embolus that gets stuck in an artery and blocks the artery that supplies an area of ​​brain tissue. If an artery is blocked, post-ischemic damage ensues, and brain cells may stop working. Furthermore, if the artery remains blocked for more than a few minutes, brain cells may die, which leads to permanent neurological deficits or death. Therefore, immediate treatment is critical.

[0003] Acute ischemic stroke is usually treated by extending a conical catheter through the femoral artery to the location of the embolus. The embolus may be located in the extracranial carotid artery, vertebral artery or intracranial artery. The embolus is removed from the artery through the conical catheter by suction technology or other means, thereby unblocking the artery. However, due to the small cross-sectional area of ​​the end of the conical catheter, when aspirating a larger diameter embolus, the embolus is likely to block the port of the conical catheter, resulting in failure of the operation. Summary of the invention

[0004] The purpose of the present invention is to provide a catheter and a medical device to solve the problems existing in the above-mentioned prior art and to improve the success rate of the operation.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a catheter, comprising a tube body, wherein the tube body is a tapered tube, the tube body comprises an inner tube layer and an outer tube layer which are fixedly connected, the outer surface of the inner tube layer is fixedly connected to the inner surface of the outer tube layer, the inner tube layer is a soft layer, the tube body comprises an inner diameter variable section, a front annular skeleton is arranged in the inner tube layer of the inner diameter variable section, and the front annular skeleton can move in a radial direction toward the outer tube layer.

[0007] Preferably, the tube body further includes a constant inner diameter section, one end of which is connected to the variable inner diameter section, a rear annular skeleton is provided in the constant inner diameter section, and the diameter of the tube body gradually increases from the variable inner diameter section to the constant inner diameter section.

[0008] Preferably, the front annular skeleton comprises a plurality of circular ring members, and the plurality of circular ring members are arranged side by side and spaced apart along the axial direction of the tube body, and the circular ring members comprise a plurality of unconnected arc segments, and the diameters of the plurality of circular ring members gradually increase in the direction approaching the constant inner diameter segment, and the distance between two adjacent circular ring members gradually decreases in the direction approaching the constant inner diameter segment, and the rear annular skeleton is a spiral metal wire, the axis of the spiral metal wire coincides with the axis of the tube body, the radius of the spiral metal wire gradually increases in the direction away from the variable inner diameter segment, and the pitch of the spiral metal wire gradually decreases in the direction away from the variable inner diameter segment.

[0009] Preferably, a plurality of annular grooves are arranged on the outer surface of the inner tube layer, the inner diameter of the annular grooves is the same as the inner diameter of the circular ring, each of the annular grooves accommodates one annular member, and the annular member is spaced apart from the outer tube layer.

[0010] Preferably, the arc segment is a semicircular ring, and the outer surface of the variable inner diameter segment is provided with a hydrophilic coating.

[0011] Preferably, the outer tube layer includes a plurality of fixedly connected outer tube segments along the axial direction of the tube body, and the hardness of the plurality of outer tube segments gradually increases along the direction from the variable inner diameter segment to the constant inner diameter segment.

[0012] Preferably, a circular soft head is fixedly provided on the end of the tube body away from the constant inner diameter section, and the edges of the circular soft head are rounded. The circular soft head is used to prevent the end of the tube body from damaging the blood vessel. A developing tracer marker ring is provided on the variable inner diameter section at a position away from the constant inner diameter section and located between the outer tube layer and the inner tube layer.

[0013] Preferably, it also includes a tube seat and a protective tube, wherein the tube seat is fixedly connected and communicated with the end of the tube body away from the variable inner diameter section, the tube seat is used to communicate with an external component, and the protective tube is sleeved at the connection between the tube seat and the tube body.

[0014] Preferably, the length of the tube body is 100-150 cm, the wall thickness of the tube body is 0.2-0.4 mm, the maximum inner diameter of the tube body is 1.6-2 mm, and the minimum inner diameter of the tube body is 1.3-1.7 mm.

[0015] The present invention also provides a medical device, comprising the catheter as described above.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention provides a catheter and a medical device, wherein a tube body comprises an inner tube layer and an outer tube layer, wherein the outer tube layer can maintain its shape when the tube body is compressed in a blood vessel, and can also prevent the tube body from expanding in the blood vessel and damaging the blood vessel, and a front annular skeleton is arranged in an inner diameter variable section, and the front annular skeleton can move in a radial direction toward the outer tube layer, so that when the thinnest end of the inner diameter variable section contacts and aspirates a thrombus, the soft layer can not only provide sufficient anti-deformation ability for the tube body, but also expand the soft layer, thereby preventing the catheter and the catheter port from being blocked due to excessive thrombus volume, and improving the success rate of the operation.

[0018] Furthermore, the arrangement of the inner diameter constant section and the rear annular skeleton can simplify the production process of the pipe body and further improve the deformation resistance of the pipe body.

[0019] Furthermore, the front annular skeleton includes a plurality of circular ring members, and the circular ring members include a plurality of circular arc segments, with a simple structure and low cost; the diameters of the plurality of circular ring members gradually increase along the direction approaching the constant inner diameter segment, and the distance between two adjacent circular ring members gradually decreases along the direction approaching the constant inner diameter segment, which can improve the radial deformation resistance and axial deformation resistance of the tube body; the rear annular skeleton is a spiral metal wire, with a simple structure, which can simultaneously improve the radial deformation resistance and axial deformation resistance of the tube body, the radius of the spiral metal wire gradually increases along the direction away from the variable inner diameter segment, and the pitch of the spiral metal wire gradually decreases along the direction away from the variable inner diameter segment, which can further simultaneously improve the radial deformation resistance and axial deformation resistance of the tube body.

[0020] Furthermore, the annular member is disposed in the annular groove and is spaced apart from the outer tube layer, which can facilitate the outward expansion of the annular member and improve the permeability of the thrombus.

[0021] Furthermore, the arc segment is a semicircular ring with a simple structure, which is convenient for the production of the tube body; the provision of the hydrophilic coating can facilitate the insertion of the tube body into human blood vessels and improve the permeability of blood clots in the tube body.

[0022] Furthermore, the hardness of the plurality of outer tube sections is gradually increased from the variable inner diameter section to the constant inner diameter section, which can improve the axial deformation resistance of the tube body.

[0023] Furthermore, the provision of the circular soft head can prevent the tube body from scratching and piercing the blood vessel during insertion; the provision of the developing indicator marking ring facilitates observation of the specific position of the end of the tube body in the human body.

[0024] Furthermore, the provision of the tube holder facilitates the connection between the tube body and the external components; the provision of the protective tube can protect the connection between the tube body and the tube holder and prevent it from being bent and damaged.

[0025] Furthermore, the length of the tube body is 100-150 cm, the wall thickness of the tube body is 0.2-0.4 mm, the maximum inner diameter of the tube body is 1.6-2 mm, and the minimum inner diameter of the tube body is 1.3-1.7 mm. Tubes of this size have the best thrombus permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a catheter provided in Example 1;

[0028] Figure 2 A schematic diagram of the structure of the tube body provided in Example 1;

[0029] Figure 3 A schematic cross-sectional structural diagram of a variable inner diameter section of a catheter provided in Example 1;

[0030] In the figure: 1-tube body, 2-outer tube layer, 3-inner tube layer, 4-inner diameter variable section, 5-inner diameter constant section, 6-circular ring member, 7-arc section, 8-circular ring soft head, 9-development tracer marking ring, 10-protective tube, 11-tube seat. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a catheter and a medical device to solve the problems existing in the prior art and improve the success rate of surgery.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Embodiment 1

[0035] This embodiment provides a catheter, such as Figures 1 to 3As shown, in this embodiment, the catheter includes a tube body 1, which is a tapered tube. The tube body 1 includes an inner tube layer 3 and an outer tube layer 2 that are fixedly connected. The outer surface of the inner tube layer 3 is fixedly connected to the inner surface of the outer tube layer 2. The inner tube layer 3 is a soft layer. The inner tube layer 3 can be made of super soft materials: PTFE, PFA, PA, TPU, PU and other polymer materials. The tube body 1 includes an inner diameter variable section 4. A front annular skeleton is arranged in the inner tube layer 3 of the inner diameter variable section 4. The front annular skeleton is close to the outer surface of the inner tube layer 3. The front annular skeleton can move in a radial direction close to the outer tube layer 2. The tube body 1 includes the inner tube layer 3 and the outer tube layer 2. The outer tube layer 2 can remain unchanged when the tube body 1 is compressed in the blood vessel. It can also prevent the tube body 1 from expanding in the blood vessel and damaging the blood vessel. A front annular skeleton is arranged in the inner diameter variable section 4, and the front annular skeleton can move along its radial direction toward the outer tube layer 2, so that the thinnest end of the inner diameter variable section 4 can not only provide sufficient deformation resistance for the tube body 1 during contact and suction of the thrombus, but also enable the soft layer to expand, thereby preventing the catheter and the catheter port from being blocked due to excessive thrombus volume, thereby improving the success rate of the operation. A metal braided reinforcement layer can also be arranged between the inner tube layer 3 and the outer tube layer 2. The metal braided reinforcement layer can be made of stainless steel or nickel-titanium wire, tungsten wire, nylon wire, aramid wire, PEEK wire, LCP wire and other materials, and can also be used in combination.

[0036] The tube body 1 also includes a constant inner diameter section 5, one end of which is connected to the variable inner diameter section 4, and a rear annular skeleton is arranged in the constant inner diameter section 5. The diameter of the tube body 1 gradually increases from the variable inner diameter section 4 to the constant inner diameter section 5. The arrangement of the constant inner diameter section 5 and the rear annular skeleton can simplify the production process of the tube body 1 and further improve the deformation resistance of the tube body 1.

[0037] The front annular skeleton includes a plurality of circular ring members 6, which are arranged side by side and spaced apart along the axis direction of the tube body 1. The circular ring members include a plurality of unconnected arc segments 7, which have a simple structure and low cost. The diameters of the plurality of circular ring members 6 gradually increase along the direction approaching the constant inner diameter segment 5, and the distance between two adjacent circular ring members 6 gradually decreases along the direction approaching the constant inner diameter segment 5, which can improve the radial deformation resistance and axial deformation resistance of the tube body 1. The rear annular skeleton is a spiral metal wire, and the cross section of the spiral metal wire is circular, oblate or other shapes, etc. The spiral metal wire can be formed by a single metal wire or by a plurality of A plurality of metal wires are paralleled to form the spiral metal wire, the axis of which coincides with the axis of the tube body 1, and the structure is simple. The radial and axial deformation resistance capabilities of the tube body 1 can be improved simultaneously. The radius of the spiral metal wire gradually increases in the direction away from the variable inner diameter section 4, and the pitch of the spiral metal wire gradually decreases in the direction away from the variable inner diameter section 4, which can further improve the radial and axial deformation resistance capabilities of the tube body 1 simultaneously. The diameter and pitch of the spiral metal wire can also remain the same. The material of the spiral metal wire is stainless steel or nickel-titanium wire, tungsten wire, nylon wire, aramid wire, PEEK wire, LCP wire or other materials.

[0038] A plurality of annular grooves are arranged on the outer surface of the inner tube layer 3, the inner diameter of the annular grooves is the same as the inner diameter of the circular ring, and each annular groove accommodates an annular member 6, and the annular member 6 is spaced apart from the outer tube layer 2, which can facilitate the outward expansion of the annular member 6 and improve the permeability of the blood clot.

[0039] The arc segment 7 is a semicircular ring with a simple structure, which is convenient for the production of the tube body 1. The outer surface of the variable inner diameter segment 4 is provided with a hydrophilic coating, which can facilitate the insertion of the tube body 1 into the human blood vessel and improve the passability of blood clots in the tube body 1.

[0040] The outer tube layer 2 includes several fixedly connected outer tube segments along the axial direction of the tube body 1. The hardness of the multiple outer tube segments gradually increases from the variable inner diameter segment 4 to the constant inner diameter segment 5, which can improve the axial deformation resistance of the tube body 1 and provide corresponding pushing, supporting, stability, flexibility, and anti-bending properties for the movement of the tube body 1 in the blood vessel, so that the catheter can reach the lesion site quickly, accurately and easily. The multiple outer layer segments can be used in combination with several other polymer materials such as TPU, PEBAX, PU, ​​PA, etc. with increasing hardness.

[0041] A circular soft head 8 is fixedly provided on the end of the tube body 1 away from the constant inner diameter section 5, and the edges of the circular soft head 8 are rounded. The circular soft head 8 is used to prevent the end of the tube body 1 from damaging the blood vessel. The setting of the circular soft head 8 can prevent the tube body 1 from scratching and piercing the blood vessel during the insertion of the blood vessel. A developing tracer marker ring 9 is provided on the variable inner diameter section 4 away from the constant inner diameter section 5 and between the outer tube layer 2 and the inner tube layer 3, which is convenient for observing the specific position of the end of the tube body 1 in the human body. The developing tracer marker ring 9 can be circular or C-shaped. The material of the developing tracer marker ring 9 can be platinum-iridium alloy, platinum, gold, tungsten and other materials that can be developed.

[0042] It also includes a tube seat 11 and a protective tube 10. The tube seat 11 is fixedly connected and communicated with the end of the tube body 1 away from the variable inner diameter section 4. The tube seat 11 is used to communicate with external components. The external components can be a catheter guide wire, an extension tube, a rotary hemostatic valve, etc. The protective tube 10 is sleeved on the connection between the tube seat 11 and the tube body 1, which can protect the connection between the tube body 1 and the tube seat 11 and prevent it from being bent and damaged.

[0043] The length of the tube body 1 is 100-150 cm, preferably 130 cm, the wall thickness of the tube body 1 is 0.2-0.4 mm, preferably 0.3 mm, the maximum inner diameter of the tube body 1 is 1.6-2 mm, preferably 1.8 mm, and the minimum inner diameter of the tube body 1 is 1.3-1.7 mm, preferably 1.5 mm. The tube body 1 of this size has the best thrombus permeability.

[0044] Embodiment 2

[0045] This embodiment provides a medical device, such as Figures 1 to 3 As shown, in this embodiment, the medical device includes the catheter in the first embodiment, and the tube body 1 includes an inner tube layer 3 and an outer tube layer 2. The outer tube layer 2 can keep the tube body 1 unchanged when it is compressed in the blood vessel, and can also prevent the tube body 1 from expanding in the blood vessel and damaging the blood vessel. A front annular skeleton is arranged in the variable inner diameter section 4, and the front annular skeleton can move in the radial direction toward the outer tube layer 2, so that when the thinnest end of the variable inner diameter section 4 contacts and aspirates the thrombus, the soft layer can not only provide sufficient anti-deformation ability for the tube body 1, but also expand the soft layer to prevent the catheter and the catheter port from being blocked due to excessive thrombus volume, thereby improving the success rate of the operation.

[0046] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A catheter, characterized in that: include: A tube body, wherein the tube body is a tapered tube, and the tube body comprises an inner tube layer and an outer tube layer which are fixedly connected, wherein the outer surface of the inner tube layer is fixedly connected to the inner surface of the outer tube layer, and the inner tube layer is a soft layer, and the tube body comprises a variable inner diameter section, wherein a front annular skeleton is arranged in the inner tube layer of the variable inner diameter section, and the front annular skeleton can move in a radial direction toward the outer tube layer, and the front annular skeleton comprises a plurality of circular rings, wherein the plurality of circular rings are arranged side by side and spaced apart along the axis direction of the tube body, and the circular rings comprise a plurality of unconnected arc segments; A plurality of annular grooves are arranged on the outer surface of the inner tube layer, the inner diameter of the annular grooves is the same as the inner diameter of the annular member, each of the annular grooves accommodates one annular member, and the annular member is spaced apart from the outer tube layer.

2. The catheter according to claim 1, characterized in that: The tube body also includes a constant inner diameter section, one end of which is connected to the variable inner diameter section, a rear annular skeleton is arranged in the constant inner diameter section, and the diameter of the tube body gradually increases from the variable inner diameter section to the constant inner diameter section.

3. The catheter according to claim 2, characterized in that: The diameters of the multiple circular ring members gradually increase along the direction approaching the constant inner diameter section, and the distance between two adjacent circular ring members gradually decreases along the direction approaching the constant inner diameter section. The rear annular skeleton is a spiral metal wire, the axis of the spiral metal wire coincides with the axis of the tube body, the radius of the spiral metal wire gradually increases along the direction away from the variable inner diameter section, and the pitch of the spiral metal wire gradually decreases along the direction away from the variable inner diameter section.

4. The catheter according to claim 1, characterized in that: The arc segment is a semicircular ring, and the outer surface of the variable inner diameter segment is provided with a hydrophilic coating.

5. The catheter according to claim 2, characterized in that: The outer tube layer includes a plurality of fixedly connected outer tube segments along the axial direction of the tube body, and the hardness of the plurality of outer tube segments gradually increases from the variable inner diameter segment to the constant inner diameter segment.

6. The catheter according to claim 2, characterized in that: A circular soft head is fixedly provided on the end of the tube body away from the constant inner diameter section, and the edges of the circular soft head are rounded. The circular soft head is used to prevent the end of the tube body from damaging the blood vessel. A developing tracer marker ring is provided on the variable inner diameter section at a position away from the constant inner diameter section and between the outer tube layer and the inner tube layer.

7. The catheter according to claim 1, characterized in that: It also includes a tube seat and a protective tube. The tube seat is fixedly connected and communicated with the end of the tube body away from the variable inner diameter section. The tube seat is used to communicate with external components. The protective tube is sleeved at the connection between the tube seat and the tube body.

8. The catheter according to claim 1, characterized in that: The length of the tube body is 100-150 cm, the wall thickness of the tube body is 0.2-0.4 mm, the maximum inner diameter of the tube body is 1.6-2 mm, and the minimum inner diameter of the tube body is 1.3-1.7 mm.

9. A medical device, characterized in that: Comprising a catheter as described in any one of claims 1 to 8.

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