CN113893435A

CN113893435A - Medical catheter

Info

Publication number: CN113893435A
Application number: CN202111200084.XA
Authority: CN
Inventors: 吕怡然; 高洪亮; 周连海
Original assignee: Aike Medical Devices Beijing Co ltd
Current assignee: Aike Medical Devices Beijing Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-01-07

Abstract

The utility model discloses a medical catheter, medical catheter include body, toper buffer tube and adapting unit, and the body is connected to inside adapting unit toper portion, and toper buffer tube cup joints at body near-end and outside adapting unit toper portion, and wherein the body includes inlayer, intermediate level and skin, and the intermediate level includes at least one section whole laser engraving metal shaping layer. The medical catheter has the advantages of twisting control, bending resistance, knotting resistance, ovalization resistance, good pushing performance and reduced processing difficulty.

Description

Medical catheter

Technical Field

The disclosure relates to the field of medical instruments, in particular to a medical catheter.

Background

Intravascular devices such as catheters are often used in the medical field. Catheters are typically inserted into a patient's femoral artery, radial artery, carotid artery, or jugular vein and are passed through a patient's blood vessel to reach the heart, brain, or other target anatomy. Typically, a guidewire is first guided to the target anatomy, and one or more catheters are then passed over the guidewire and guided to the target anatomy. Once in place, the catheter may be used to deliver drugs, stents, embolic devices, radiopaque dyes, or other devices or substances for treating the patient in a desired manner. In other cases, the catheter and guidewire are delivered simultaneously toward the target anatomy while the guidewire is within the catheter, and then the guidewire is further delivered into the anatomy by translation within the catheter.

In many applications, the catheter needs to travel through a tortuous vessel to an anatomical site, which requires that the intravascular catheter have good pressure resistance, strong torque, pushability, strong resistance to bending, and timely responsiveness. One type of medical catheter of the prior art comprises a tubular body, a tapered buffer tube and a connecting part, wherein the tubular body is inscribed inside the taper of the connecting part and the tapered buffer tube is sleeved at the proximal end of the tubular body and outside the taper of the connecting part. The tapered buffer tube helps to avoid bending of the catheter at the junction of the tube body and the connecting member during use. The pipe body and the connecting part are fixed together in an adhesive mode. The conical buffer tube is fixed with the connecting part in an interference fit or bonding mode.

The tubular body generally comprises an inner layer, an intermediate layer and an outer layer. The inner layer and the outer layer of the conduit are generally made of polymer materials, and the middle layer is generally formed by winding metal wires. The catheter needs to have axial delivery capability to facilitate the catheter reaching the lesion along the vessel. While radial crush resistance is required. The metal wire braided layer increases the axial conduction and the radial anti extrusion performance of pipe, reduces the pipe chamber when the pipe is buckled. Typically, the catheter tube is designed such that the distal end of the catheter is relatively soft and the proximal end is relatively stiff. When the catheter is used as a passageway for other instruments to pass through, the catheter can be retracted backwards to provide support for the delivery instrument as the other instruments are advanced through the catheter. If the distal support force of the catheter is sufficient, the distal portion of the catheter will contact the vessel wall and, after support, the catheter will not retract further as other devices continue to advance through the catheter.

The torsional control of the catheter is also important in operation, and when the doctor rotates the proximal end during the operation of the catheter at the proximal end, the distal end of the catheter rotates in the same direction and angle in an ideal state. However, none of the existing catheters is practically feasible because the proximal end of the catheter is hard and the distal end is soft, and the catheter is braided or wound, which makes the force transmission poor, even the proximal operation often occurs and the distal end has no feedback. The prior art catheter has the following problems.

The metal wire braided intermediate layer catheter has better twisting control performance and is beneficial to transmitting force from the near end to the far end. However, because the metal wire weaving middle layer is formed by weaving a plurality of weaving wires, the force transmitted by a single wire can be dispersed by other wires, the force at the near end cannot be transmitted to the far end in time, and the problems of time delay and diameter increase exist. The metal wire wound middle layer conduit has poorer bending resistance than the braided conduit. But because no crossover is required, the outside diameter of the tube body is not further increased. The middle layer wound conduit has better anti-ovalization and poorer torsion control performance. The overall diameter of the middle layer of the metal braided and wound mixed catheter is increased, and the clinical application range is reduced.

The catheter in the metal wire intermediate layer still often appears twisting control nature, anti buckling, anti knot, push performance etc. not enough in the in-service use, often can appear the catheter because of the operation of near-end, makes it unable effective transmission to the catheter distal end, causes the catheter to use badly. Meanwhile, the process of metal weaving and winding the middle layer conduit is complicated in the processing process. After the metal wire is woven, the metal wire needs to be trimmed in order to be sleeved with the outer polymer tube, the metal wire is operated by hands, the operation difficulty is high, and the inner layer of the catheter is easy to damage. In addition, the catheter with the developing ring also needs to be sleeved in advance and fixed in advance in the assembling process of the catheter, and then the outer tube of the catheter is subjected to integral hot melting. However, the middle layer processed by laser engraving can weld the developing ring and the middle layer together in a welding mode, and then the inner layer, the middle layer and the outer layer can be subjected to hot melting splicing directly in a sleeving mode.

The present disclosure is directed to a novel medical catheter, which overcomes the drawbacks of the prior art, improves the twisting control, bending resistance, knotting resistance, ovalization resistance, pushing performance, etc. of catheters, and reduces the operation difficulty in the catheter processing.

Disclosure of Invention

The present disclosure is directed to a novel medical catheter wherein the intermediate layer includes at least one integral laser engraved shaped layer. The novel medical catheter solves the problems of the catheter in the prior art. The specific technical scheme of the disclosure is as follows:

one embodiment of the present disclosure provides a medical catheter comprising a tube body connected to inside of a taper portion of a connection part, a tapered buffer tube sleeved at a proximal end of the tube body and outside of the taper portion of the connection part, wherein the tube body comprises an inner layer, an intermediate layer and an outer layer, the intermediate layer comprising at least one section of an integral laser engraved metal molding layer, and a connection part.

According to one embodiment of the present invention, there is provided a medical catheter, wherein the at least one integral laser engraved metal formed layer comprises a plurality of radial beams and at least one axial beam, the plurality of radial beams being spaced apart along the axial direction, the at least one axial beam being adapted to connect the plurality of radial beams.

According to the medical catheter provided by the embodiment of the invention, at least one section of the integral hollow carving molding layer is positioned at the far end of the middle layer and can be bent and shaped in advance.

According to one embodiment of the present invention, there is provided a medical catheter, wherein at least one of the integral laser engraved metal layers is made of a shape memory alloy.

According to the medical catheter provided by the embodiment of the invention, the proximal end of the middle layer is woven by the metal wires and is in a net structure.

According to one embodiment of the present invention, a medical catheter is provided, wherein the proximal end of the intermediate layer is formed by winding a metal wire and has a spiral structure.

According to one embodiment of the present invention there is provided a medical catheter as described above wherein at least one integral laser engraved metal profiled layer is located proximal to the intermediate layer.

According to one embodiment of the present invention, a medical catheter is provided, wherein the distal end of the intermediate layer is formed by winding a metal wire and has a spiral structure.

According to one embodiment of the present invention, a medical catheter is provided, wherein the distal end of the intermediate layer is woven by a metal wire and has a net structure.

According to one embodiment of the present invention, there is provided a medical catheter wherein the intermediate layer comprises an inner intermediate layer and an outer intermediate layer, the inner intermediate layer being sandwiched between the inner and outer intermediate layers, the outer intermediate layer being sandwiched between the inner intermediate layer and the outer layer, the outer intermediate layer comprising at least one section of integrally laser engraved metal profiled layer.

According to the medical catheter provided by the embodiment of the invention, the inner middle layer is formed by winding the metal wire and has a spiral structure.

According to the medical catheter provided by the embodiment of the invention, the inner middle layer is woven by metal wires and has a net structure.

According to the medical catheter provided by the embodiment of the invention, at least one integral laser engraving metal molding layer is arranged on the inner middle layer bending part, and the bending degree of the inner middle layer bending part is consistent with that of a target blood vessel introduced by the medical catheter.

According to the medical catheter provided by the embodiment of the invention, the proximal end of the inner middle layer is woven by metal wires and is in a net structure, and the distal end of the inner middle layer is wound by the metal wires and is in a spiral structure.

According to one embodiment of the present invention, a medical catheter is provided, wherein the radial beam of the intermediate layer comprises a plurality of proximal radial beams and distal radial beams spaced apart from each other, and the beam width L1 of the proximal radial beams is not less than the beam width L2 of the distal radial beams.

According to the medical catheter provided by the above embodiment of the invention, the beam width L1 of the proximal radial beam has a width range of: 0.1mm < L1 < 50mm, and the width range of the beam width L2 of the far-end radial beam is as follows: l2 is more than 0.1mm and less than 50 mm.

There is provided in accordance with the above-described one embodiment of the present invention a medical catheter, wherein a gap D1 between the plurality of proximal radial beams is not less than a gap D2 between the plurality of distal radial beams.

According to one embodiment of the present invention, there is provided the medical catheter, wherein the gap D1 between the proximal radial beams is in the range of: 10 μm < D1 < 50mm, the gap D2 between the distal radial beams ranges: 10 μm < D1 < 50 mm.

According to the medical catheter provided by the embodiment of the invention, the diameter OD1 of the proximal radial beam is not smaller than the diameter OD2 of the distal radial beam.

According to the medical catheter provided by the embodiment of the invention, the diameter OD1 of the proximal radial beam ranges from: OD1 is more than or equal to 0.35mm and less than or equal to 27mm, and the diameter OD2 of the distal radial beam ranges from: OD1 is more than or equal to 0.35mm and less than or equal to 27 mm.

The medical catheter provided according to the above one embodiment of the present invention, wherein the axial beams include a proximal axial beam L3 and a distal axial beam L4, the proximal axial beam L3 is used to connect a plurality of proximal radial beams, and the distal axial beam L4 is used to connect a plurality of distal radial beams.

According to the medical catheter provided by the embodiment of the invention, the total length of the proximal axial beam L3 is 500 mm-1000 mm.

According to the medical catheter provided by the embodiment of the invention, the total length L4 of the distal axial beam L4 is 500 mm-800 mm.

According to the medical catheter provided by the above embodiment of the present invention, the number N1 of the radial beams is calculated by formula 1: n1 ═ L3-L1)/(L1+ D1) + L4/(D2+ L2).

According to one embodiment of the present invention, a medical catheter is provided, wherein the axial beam proximal arc length L5 is not less than the axial beam distal arc length L6.

According to the medical catheter provided by the embodiment of the invention, the ratio of the axial beam proximal arc length L5 to the axial beam distal arc length L6 is in the range of: L5/L6 is more than or equal to 1 and less than or equal to 30: 1.

According to one embodiment of the present invention, there is provided a medical catheter, wherein the axial beam proximal arc length L5 is in the range of: l5 is more than or equal to 10 mu m and less than pi multiplied by OD1, and the range of the far-end arc length L6 of the axial beam is as follows: l6 is more than or equal to 10 mu m and less than pi multiplied by OD 1.

According to the medical catheter provided by the above one embodiment of the present invention, the number of axial beams N2 of the proximal axial beam L3 and the number of beams N3 of the distal axial beam L4 are in the range of: n3 is more than or equal to 1 and less than or equal to N2 and less than or equal to 50.

According to the medical catheter provided by the embodiment of the invention, the winding number N4 is in the range as follows: n4 is more than or equal to 0 and less than or equal to N1-1, and the number of winding turns refers to the total number of turns of the axial beam winding the pipe body from the near end of the catheter to the far end of the catheter.

According to one embodiment of the present invention, there is provided the medical catheter, wherein the metal wire is a round wire or a flat wire.

According to the medical catheter provided by the embodiment of the invention, the metal wire is made of nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, stainless steel or composite alloy.

According to the medical catheter provided by the above one embodiment of the present invention, the intermediate layer is engraved on the cylindrical metal tube according to the design pattern by laser.

According to the medical catheter provided by the above one embodiment of the present invention, the intermediate layer is engraved on the metal plate according to the design pattern by laser, and the engraved metal plate forms the cylindrical metal tube by welding.

According to the medical catheter provided by the above one embodiment of the present invention, the cylindrical metal tube and the metal plate are made of nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, stainless steel, or composite alloy.

According to the medical catheter provided by the embodiment of the invention, the medical catheter further comprises a developing ring, the developing ring is welded with at least one section of integral laser engraving layer, and the inner layer, the middle layer and the outer layer are directly sleeved and then subjected to hot melting splicing.

The medical catheter according to the above-described embodiment of the present disclosure has the following technical effects. 1) According to the medical catheter provided by the embodiment of the disclosure, the bending resistance and the anti-twisting performance of the catheter are enhanced and the supporting performance of the catheter is improved due to the fact that the intermediate layer is formed by integrally carving the metal forming layer through laser. 2) According to the medical catheter provided by the above embodiment of the present disclosure, since the intermediate layer adopts the integral laser engraved metal molding layer, the integrated design is beneficial for designers to carry out different pattern designs according to requirements, and breaks through the conventional weaving and winding manner. 3) According to the medical catheter provided by the above embodiment of the present disclosure, since the intermediate layer is formed by integrally laser-engraving the metal molding layer, the stress can be easily diffused. 4) According to the medical catheter provided by the above embodiment of the present disclosure, since the intermediate layer adopts the integral laser-engraved metal molding layer, which includes the axial beam and the radial beam, the axial beam increases the conduction of the axial force of the catheter, which facilitates the transmission of the force of the proximal end of the catheter to the distal end of the catheter; the radial beam can keep the catheter in a lumen, and the radial pressure resistance of the catheter is improved. 5) According to the medical catheter provided by the above embodiment of the present disclosure, the middle layer processed by laser engraving may be welded to the developing ring and the middle layer by welding, and then the inner layer, the middle layer, and the outer layer are directly subjected to hot-melt splicing by sleeving. The developing ring does not need to be sleeved and fixed in advance, so that the workload is reduced, and the overall performance is improved.

Drawings

Other features, objects and advantages of the disclosure will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a cross-sectional view of a medical catheter of the prior art.

Fig. 2 shows a front view of an intermediate layer of a medical catheter according to a first embodiment of the disclosure.

Fig. 3 shows a schematic axial beam winding state diagram of a medical catheter intermediate layer according to a first embodiment of the disclosure.

Fig. 4 is a schematic view showing a non-winding state of an axial beam of an intermediate layer of a medical catheter according to a first embodiment of the present disclosure.

Fig. 5 shows a schematic view of a portion of the intermediate layer of a medical catheter according to a second embodiment of the present disclosure.

Fig. 6 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a third embodiment of the present disclosure.

Fig. 7 shows a schematic view of a portion of the intermediate layer of a medical catheter according to a fourth embodiment of the present disclosure.

Fig. 8 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a fifth embodiment of the present disclosure.

Fig. 9 shows a schematic view of a portion of the intermediate layer of a medical catheter according to a sixth embodiment of the present disclosure.

Fig. 10 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a seventh embodiment of the present disclosure.

Fig. 11 shows a schematic view of a portion of an intermediate layer of a medical catheter according to an eighth embodiment of the present disclosure.

Fig. 12 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a ninth embodiment of the disclosure.

Fig. 13 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a tenth embodiment of the present disclosure.

Fig. 14 shows a schematic view of a medical catheter inserted into a target blood vessel according to a ninth embodiment of the present disclosure.

Reference numerals and parts lists

Detailed Description

The following description of the embodiments of the present disclosure will be provided in conjunction with the accompanying drawings and examples, and those skilled in the art can easily understand the technical problems and technical solutions solved by the present disclosure and the technical effects produced thereby through the contents described in the present specification. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. In addition, for convenience of description, only portions related to the related invention are shown in the drawings.

It should be noted that the structures, proportions, and dimensions shown in the drawings and described in the specification are for the understanding and reading of the present disclosure, and are not intended to limit the conditions under which the present disclosure can be implemented, so they are not technically significant, and any modifications of the structures, changes in the proportions and adjustments of the dimensions should be made without affecting the efficacy and attainment of the same.

The use of words such as "first," "second," "the," and the like in this disclosure is not to be construed as limiting in number and may refer to the singular or the plural. The present disclosure is directed to the terms "comprising," "including," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. References in the present disclosure to "connected," "coupled," and the like are not to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Reference to "a plurality" in this disclosure means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference throughout this disclosure to the terms "first," "second," "third," and the like, merely distinguish between similar objects and do not represent a particular ordering for the objects.

Fig. 1 shows a cross-sectional view of a medical catheter of the prior art. Fig. 2 shows a front view of an intermediate layer of a medical catheter according to a first embodiment of the disclosure. Fig. 3 shows a schematic axial beam winding state diagram of a medical catheter intermediate layer according to a first embodiment of the disclosure. Fig. 4 is a schematic view showing a non-winding state of an axial beam of an intermediate layer of a medical catheter according to a first embodiment of the present disclosure. As shown in fig. 1, a medical catheter 1 of the prior art includes a tube body 10, a tapered buffer tube 11, and a connecting member 12, the tube body 10 being connected to the inside of a tapered section 120 of the connecting member 11, the tapered buffer tube 11 being sleeved at the tube body proximal end 100 and outside of the tapered section 120 of the connecting member. As shown in fig. 2-4, a medical catheter according to a first embodiment of the present disclosure is constructed identically to the medical catheter of the prior art as described above. A difference between a medical catheter of a first embodiment of the present disclosure and the prior art is: the pipe body 10 comprises an inner layer, an intermediate layer and an outer layer, wherein the intermediate layer comprises a plurality of radial beams 101 and axial beams 102 which are integrally formed through hollow carving, the radial beams 101 are arranged at intervals along the axial direction, and the axial beams 102 are used for connecting the radial beams 101.

A medical catheter according to one embodiment of the present disclosure, wherein the radial beam 10 comprises a plurality of spaced proximal radial beams 1011 and distal radial beams 1012, the beam width L1 of the proximal radial beams being no less than the beam width L2 of the distal radial beams.

A medical catheter according to an embodiment of the present disclosure, wherein the beam width L1 of the proximal radial beam 1011 has a width in the range of: 0.1mm < L1 < 50mm, the beam width L2 of the distal radial beam 1012 has a width range of: l2 is more than 0.1mm and less than 50 mm.

A medical catheter in accordance with an embodiment of the present disclosure, wherein a gap D1 between the plurality of proximal radial beams is not less than a gap D2 between the plurality of distal radial beams.

A medical catheter according to an embodiment of the present disclosure, wherein the gap D1 between the proximal radial beams ranges from: 10 μm < D1 < 50mm, the gap D2 between the distal radial beams ranges: 10 μm < D1 < 50 m.

A medical catheter according to an embodiment of the present disclosure, wherein a diameter OD1 of the proximal radial beam is not less than a diameter OD2 of the distal radial beam.

A medical catheter according to an embodiment of the present disclosure, wherein the diameter OD1 of the proximal radial beam ranges from: OD1 is more than or equal to 0.35mm and less than or equal to 27mm, and the diameter OD2 of the distal radial beam ranges from: OD1 is more than or equal to 0.35mm and less than or equal to 27 mm.

A medical catheter according to an embodiment of the present disclosure, wherein the axial beam 10 comprises a proximal axial beam L3 and a distal axial beam L4, the proximal axial beam L3 for connecting the plurality of proximal radial beams 1011 and the distal axial beam L4 for connecting the plurality of distal radial beams 1012.

A medical catheter according to one embodiment of the present disclosure, wherein the total length of the proximal axial beam L3 is between 500mm and 1000 mm.

A medical catheter according to an embodiment of the present disclosure, wherein the distal axial beam L4 has an overall length L4 between 500mm and 800 mm.

A medical catheter according to an embodiment of the present disclosure, wherein the number of radial beams N1 is calculated by formula 1: n1 ═ L3-L1)/(L1+ D1) + L4/(D2+ L2).

A medical catheter according to an embodiment of the present disclosure, wherein the axial beam proximal arc length L5 is not less than the axial beam distal arc length L6.

A medical catheter according to an embodiment of the present disclosure, wherein the axial beam proximal arc length L5 and the axial beam distal arc length L6 are in a ratio range of: L5/L6 is more than or equal to 1 and less than or equal to 30: 1.

A medical catheter according to one embodiment of the present disclosure, wherein the axial beam proximal arc length L5 ranges from: l5 is more than or equal to 10 mu m and less than pi multiplied by OD1, and the range of the far-end arc length L6 of the axial beam is as follows: l6 is more than or equal to 10 mu m and less than pi multiplied by OD 1.

The medical catheter according to one embodiment of the present disclosure, wherein the number of axial beams N2 of the proximal axial beam L3 and the number of beams N3 of the distal axial beam L4 are in the range of: n3 is more than or equal to 1 and less than or equal to N2 and less than or equal to 50.

A medical catheter according to one embodiment of the present disclosure, wherein the number of turns N4 ranges from: n4 is more than or equal to 0 and less than or equal to N1-1. Winding number of turns: it is meant that the axial beam is wound around the tube body a total number of turns starting from the proximal end of the catheter to the distal end of the catheter. The proximal end of the catheter is the end adjacent to the catheter attachment component and the distal end of the catheter is the end distal to the catheter attachment component.

A medical catheter according to an embodiment of the present disclosure, wherein the catheter inner and outer layers are one or more of a block polyetheramide containing barium sulfate, a block polyetheramide containing bismuth oxide, a polyurethane containing barium sulfate, and a polyurethane containing bismuth oxide. The outer surface of the catheter has smoother appearance and hand feeling, and the blood vessel is fully protected from generating thrombus, interlayer and the like. The inner surface is extremely smooth, thereby facilitating the smooth passing of instruments and reducing the adsorption of contrast agents or other medicaments on the inner wall.

According to one embodiment of the present disclosure, the intermediate layer is engraved by laser on the cylindrical metal tube according to a design pattern.

The medical catheter according to one embodiment of the present disclosure, wherein the intermediate layer is engraved on the metal plate according to a design pattern by a laser, and the metal plate engraved with the design pattern forms a cylindrical metal tube by welding.

A medical catheter according to one embodiment of the present disclosure, wherein the cylindrical metal tube and the metal plate are made of nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, stainless steel, composite alloy.

According to the medical catheter of one embodiment of the disclosure, because the intermediate layer adopts the integral laser-engraved metal forming layer, force is easier to transfer from the proximal end of the catheter to the distal end of the catheter, and the following performance of the distal end of the catheter is timely.

According to the medical catheter disclosed by the embodiment of the disclosure, the middle layer adopts the integral laser-engraved metal forming layer, so that the bending resistance and the anti-twisting performance of the catheter are enhanced, and the supporting performance of the catheter is improved.

According to the medical catheter disclosed by the embodiment of the disclosure, as the middle layer adopts the integral laser engraving metal forming layer, the integrated design is beneficial to a designer to carry out different pattern designs according to requirements, and the conventional weaving and winding mode is broken.

According to the medical catheter of one embodiment of the disclosure, the intermediate layer is the metal molding layer which is integrally laser-engraved, so that the stress can be conveniently diffused.

According to the medical catheter of one embodiment of the disclosure, the intermediate layer adopts the integral laser engraving metal forming layer which comprises the axial beam and the radial beam, the axial beam increases the conduction of the axial force of the catheter, and the force of the proximal end of the catheter is conveniently transmitted to the distal end of the catheter; the radial beam can keep the catheter in a lumen, and the radial pressure resistance of the catheter is improved.

Fig. 5 shows a schematic view of a portion of the intermediate layer of a medical catheter according to a second embodiment of the present disclosure. The second embodiment differs from the first embodiment in that: the intermediate layer proximal end 1011a is an integral laser engraved metal formed layer and the intermediate layer distal end 1012a is formed by wire winding and is in a helical configuration.

Fig. 6 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a third embodiment of the present disclosure. This third embodiment differs from the first embodiment in that the intermediate layer proximal end 1011b is a unitary laser engraved metal formed layer and the intermediate layer distal end 1012b is woven from wire in a mesh-like configuration.

Fig. 7 shows a schematic view of a portion of the intermediate layer of a medical catheter according to a fourth embodiment of the present disclosure. The fourth embodiment differs from the first embodiment in that: the middle layer proximal end 1011c is woven from wire and is in a mesh configuration, and the middle layer distal end 1012c is an integral laser engraved metal shaped layer. The intermediate layer distal end 1012c is formed of a shape memory alloy. The intermediate layer distal end 1012c is curved and may be subjected to a shaping process.

Fig. 8 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a fifth embodiment of the present disclosure. The fifth embodiment differs from the first embodiment in that: the intermediate layer proximal end 1011d is formed by winding a metal wire and is in a helical configuration, and the intermediate layer distal end 1012d is an integral laser engraved metal formed layer. The intermediate layer distal end 1012d is formed of a shape memory alloy. The intermediate layer distal end 1012d is curved and may be subjected to a shaping process.

The near-end of the catheter of the fourth embodiment and the fifth embodiment of the present disclosure is a metal wire winding layer or a metal wire weaving layer, the far-end of the catheter adopts the shape memory alloy integral laser engraving metal forming layer, the head ends 1013c and 1013d of the catheter can be pre-shaped and shaped without high-temperature shaping after the catheter body is formed, the surface of the catheter cannot be damaged due to high-temperature shaping operation, and the holding capacity of the head end of the catheter formed by high-temperature shaping after the conventional catheter is formed is unstable. The catheter head end of the utility model is shaped after the engraving of the shape memory alloy, the curvature of the catheter head end is stable, and the angle of the catheter head end is more accurate and controllable.

Fig. 9 shows a schematic view of a portion of the intermediate layer of a medical catheter according to a sixth embodiment of the present disclosure. The sixth embodiment differs from the first embodiment in that: the middle layer comprises an inner metal wire woven layer 1011e and an outer integral laser engraved metal forming layer 1012e, the inner metal wire woven layer 1011e is sandwiched between the inner layer of the catheter and the outer integral laser engraved metal forming layer 1012e, and the outer integral laser engraved metal forming layer 1012e is sandwiched between the inner metal wire woven layer 1011e and the outer layer of the catheter.

Fig. 10 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a seventh embodiment of the present disclosure. The seventh embodiment differs from the first embodiment in that: the middle layer comprises an inner metal wire winding layer 1011f and an outer integral laser engraved metal forming layer 1012f, the inner metal wire winding layer 1011f is sandwiched between the inner layer of the catheter and the outer integral laser engraved metal forming layer 1012f, and the outer integral laser engraved metal forming layer 1012f is sandwiched between the inner metal wire winding layer 1011f and the outer layer of the catheter.

Fig. 11 shows a schematic view of a portion of an intermediate layer of a medical catheter according to an eighth embodiment of the present disclosure. The eighth embodiment differs from the first embodiment in that: the intermediate level includes inboard wire winding layer 1011g and the whole laser sculpture metal shaping layer 1012g in outside, and inboard wire winding layer 1011g presss from both sides between pipe inner layer and the whole laser sculpture metal shaping layer 1012g in outside, and the whole laser sculpture metal shaping layer 1012g in outside presss from both sides between inboard wire winding layer 1011g and the pipe outer layer, and the whole laser sculpture metal shaping layer 1012g in outside is located the curved portion in inboard intermediate level.

Fig. 12 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a ninth embodiment of the disclosure. The ninth embodiment differs from the first embodiment in that: the intermediate level includes inboard wire weaving layer 1011h and the whole laser engraving metal shaping layer 1012h in outside, and inboard wire weaving layer 1011h presss from both sides between pipe inner layer and the whole laser engraving metal in outside becomes the layer type 1012h, and the whole laser engraving metal shaping layer 1012h in outside presss from both sides between inboard wire weaving layer 1011h and pipe outer, and the whole laser engraving metal in outside becomes the layer 1012h and is located the curved part in inboard intermediate level.

Fig. 13 shows a schematic view of a portion of an intermediate layer of a medical catheter according to a tenth embodiment of the present disclosure. The tenth embodiment differs from the first embodiment in that: the middle layer comprises a near-end inner metal wire braided layer 1011k, a far-end inner metal wire winding layer 1011m and an outer whole laser engraving metal forming layer 1012k, the adjacent near-end inner metal wire braided layer 1011k and the far-end inner metal wire winding layer 1011m are clamped between the inner layer and the outer whole laser engraving metal forming layer 1012k, the outer whole laser engraving metal forming layer 1012k is clamped between the adjacent near-end inner metal wire braided layer 1011k and the far-end inner metal wire winding layer 1011m and the outer layer, and the outer whole laser engraving metal forming layer 1012k is positioned above the bending section parts of the adjacent near-end inner metal wire braided layer 1011k and the far-end inner metal wire winding layer 1011 m.

Fig. 14 shows a schematic view of a medical catheter inserted into a target blood vessel according to a ninth embodiment of the present disclosure. When the catheter is used for providing access for other instruments in a bent blood vessel and advancing the other instruments, the catheter body is subjected to backward force for providing support for the other instruments, and the catheter is retracted towards the near end, so that the head end of the catheter is separated from the expected target position of the blood vessel. The curvature of the outer integral laser engraving metal molding layer in the medical catheter of the ninth embodiment is matched with the curvature of the target blood vessel 2 guided into the catheter and is placed at the position, and the medical catheter is beneficial to providing support for the target blood vessel 2.

The metal wire in the above embodiments of the present disclosure may be a round wire or a flat wire. The metal wire is made of nickel-titanium alloy, cobalt-chromium alloy, platinum-tungsten alloy, stainless steel and composite alloy.

The medical catheter also comprises a developing ring, the developing ring is welded with the whole laser engraving forming layer, and the inner layer, the middle layer and the outer layer are directly sleeved and then subjected to hot melting splicing. The developing ring does not need to be sleeved and fixed in advance, so that the workload is reduced, and the overall performance is improved.

While the present disclosure has been described and illustrated with reference to particular embodiments thereof, such description and illustration are not intended to limit the present disclosure. It will be clearly understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present disclosure as defined by the appended claims. The illustrations may not be drawn to scale. There may be a difference between the technical reproduction in the present disclosure and the actual device due to variables in the manufacturing process and the like. There may be other embodiments of the disclosure that are not specifically illustrated. The specification and drawings are to be regarded in an illustrative rather than a restrictive sense. Modifications may be made to adapt a particular situation, material, composition of matter, method, or process to the objective, spirit and scope of the present disclosure. All such modifications are intended to be within the scope of the claims appended hereto. Although the methods disclosed herein have been described with reference to particular operations performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present disclosure.

Claims

1. The utility model provides a medical catheter, medical catheter includes body, toper buffer tube and adapting unit, and the body is connected to inside adapting unit toper portion, and toper buffer tube cup joints at body near-end and outside adapting unit toper portion, its characterized in that, and the body includes inlayer, intermediate level and skin, and the intermediate level includes at least one section whole laser engraving metal shaping layer.

2. The medical catheter of claim 1, wherein the at least one integral laser engraved metal pattern comprises a plurality of radial beams spaced apart along the axial direction and at least one axial beam connecting the plurality of radial beams.

3. The medical catheter of claim 2, wherein at least one integral openwork sculpted layer is distal to the intermediate layer and is capable of being pre-curved and shaped.

4. The medical catheter of claim 3, wherein at least one of the monolithic laser engraved metal shaped layers is formed of a shape memory alloy.

5. A medical catheter according to claim 3, wherein the proximal end of the intermediate layer is woven from wire in a mesh configuration.

6. A medical catheter according to claim 3, wherein the proximal end of the intermediate layer is formed by winding a wire in a helical configuration.

7. The medical catheter of claim 2, wherein at least one integral laser engraved metal forming layer is located proximal to the intermediate layer.

8. The medical catheter of claim 7, wherein the distal end of the intermediate layer is formed by winding a wire in a helical configuration.

9. The medical catheter of claim 7, wherein the intermediate layer is braided at its distal end with a mesh structure.

10. The medical catheter of claim 2, wherein the intermediate layer comprises an inner intermediate layer and an outer intermediate layer, the inner intermediate layer being sandwiched between the inner and outer intermediate layers, the outer intermediate layer comprising at least one integral laser engraved metal profiled layer.

11. The medical catheter of claim 10, wherein the inner intermediate layer is formed by winding a metal wire in a helical configuration.

12. The medical catheter of claim 10, wherein the inner intermediate layer is woven from wire in a mesh configuration.

13. The medical catheter of claim 10, wherein at least one integral laser engraved metal formed layer is located on the inner intermediate layer curved portion having a curvature that is consistent with a curvature of a target vessel into which the medical catheter is introduced.

14. The medical catheter of claim 10, wherein the proximal end of the inner intermediate layer is woven from wire in a mesh configuration and the distal end of the inner intermediate layer is wound from wire in a helical configuration.

15. The medical catheter of claim 2, wherein the radial beams of the intermediate layer comprise a plurality of spaced proximal radial beams and distal radial beams, the proximal radial beams having a beam width L1 that is no less than the beam width L2 of the distal radial beams.

16. The medical catheter of claim 15, wherein the beam width L1 of the proximal radial beam has a width in the range of: 0.1mm < L1 < 50mm, and the width range of the beam width L2 of the far-end radial beam is as follows: l2 is more than 0.1mm and less than 50 mm.

17. The medical catheter of claim 16, wherein a gap D1 between the plurality of proximal radial beams is not less than a gap D2 between the plurality of distal radial beams.

18. The medical catheter of claim 17, wherein the gap D1 between the proximal radial beams is in the range of: 10 μm < D1 < 50mm, the gap D2 between the distal radial beams ranges: 10 μm < D1 < 50 mm.

19. The medical catheter of claim 18, wherein a diameter OD1 of the proximal radial beam is not less than a diameter OD2 of the distal radial beam.

20. The medical catheter of claim 19, wherein the diameter OD1 of the proximal radial beam ranges from: OD1 is more than or equal to 0.35mm and less than or equal to 27mm, and the diameter OD2 of the distal radial beam ranges from: OD1 is more than or equal to 0.35mm and less than or equal to 27 mm.

21. The medical catheter of claim 20, wherein the axial beams comprise a proximal axial beam L3 and a distal axial beam L4, the proximal axial beam L3 for connecting a plurality of proximal radial beams and the distal axial beam L4 for connecting a plurality of distal radial beams.

22. The medical catheter of claim 21, wherein the total length of the proximal axial beam L3 is between 500mm and 1000 mm.

23. The medical catheter of claim 22, wherein the distal axial beam L4 has an overall length L4 of between 500mm and 800 mm.

24. The medical catheter of claim 23, wherein the number of radial beams N1 is calculated by equation 1: n1 ═ L3-L1)/(L1+ D1) + L4/(D2+ L2).

25. The medical catheter of claim 24, wherein the axial beam proximal arc length L5 is not less than the axial beam distal arc length L6.

26. The medical catheter of claim 25, wherein the axial beam proximal arc length L5 and the axial beam distal arc length L6 are in a ratio range of: L5/L6 is more than or equal to 1 and less than or equal to 30: 1.

27. The medical catheter of claim 26, wherein the axial beam proximal arc length L5 ranges from: l5 is more than or equal to 10 mu m and less than pi multiplied by OD1, and the range of the far-end arc length L6 of the axial beam is as follows: l6 is more than or equal to 10 mu m and less than pi multiplied by OD 1.

28. The medical catheter of claim 27, wherein the number of axial beams N2 for the proximal axial beam L3 and the number of beams N3 for the distal axial beam L4 range from: n3 is more than or equal to 1 and less than or equal to N2 and less than or equal to 50.

29. The medical catheter of claim 28, wherein the number of turns N4 is in the range of: n4 is more than or equal to 0 and less than or equal to N1-1, and the number of winding turns refers to the total number of turns of the axial beam winding the pipe body from the near end of the catheter to the far end of the catheter.

30. A medical catheter according to claim 8 or 9, wherein the wire is a round wire or a flat wire.

31. A medical catheter according to claim 8 or 9, wherein the wire is made of nitinol, cobalt chrome, platinum tungsten, stainless steel, or a composite alloy.

32. The medical catheter of claim 1, wherein the intermediate layer is laser engraved on the cylindrical metal tube according to a design pattern.

33. The medical catheter as set forth in claim 1, wherein the intermediate layer is engraved on the metal plate by laser according to a design pattern, and the engraved metal plate is formed into a cylindrical metal tube by welding.

34. A medical catheter according to claim 32 or 33, wherein the cylindrical metal tube and the metal plate are made of nickel titanium alloy, cobalt chromium alloy, platinum tungsten alloy, stainless steel, composite alloys.

35. The medical catheter of claim 1, further comprising a development ring, wherein the development ring is welded to the at least one integral laser engraved layer, and the inner layer, the intermediate layer, and the outer layer are directly sleeved and then thermally fused.