Electrically controlled shape memory alloy controlled steering tubular and applications thereof

Abstract

The application discloses an electrically-controlled memory alloy controlled steering tubular member and application thereof, and relates to the technical field of medical treatment, in particular to an electrically-controlled memory alloy controlled steering tubular member and application thereof. The electrically-controlled memory alloy controlled steering tubular member comprises a catheter body and two electrodes, the catheter body comprises a memory alloy pipe, one end of one electrode is connected with the head end of the memory alloy pipe and the electrode is defined as a head electrode, one end of the other electrode is connected with the tail end of the memory alloy pipe and the electrode is defined as a tail electrode, the memory alloy pipe is a hollow pipe which is wound by a single strand or multiple strands of memory alloy wires, the hollow pipe is a hollow capillary tube similar to a spring pipe, the other end of the catheter body is directly or indirectly connected with a male connector, and the other ends of the two electrodes are simultaneously electrically connected with the male connector. The memory alloy pipe is powered, the temperature of the memory alloy pipe is switched between phase transition temperatures through electric heating, the controlled motion function is realized, and different requirements are met, for example, the electrically-controlled memory alloy controlled steering tubular member is applied to the fields of medical treatment, such as medical electrically-controlled catheters, guide wires and underground exploration, which need to be operated in narrow spaces.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of memory alloy controlled devices, and more particularly relates to an electrically controlled memory alloy controlled steering tubular member and application thereof. BACKGROUND

[0002] With the development of science and technology and the richness of application scenarios, people need to invent a guiding and delivering tool that can actively advance, be controlled to steer, and deliver other specific materials in a narrow and complex restricted space.

[0003] In order to understand the above concept, we can imagine the following several applications:

[0004] 1) In the field of minimally invasive and vascular intervention surgery, guide wires and catheters have been widely used as tools for guiding and delivering surgical materials. However, the existing guide wires and catheters are basically made of stainless steel wires, although the hardness, toughness and support of the guide wires and catheters can be optimized by changing the diameter, number of strands and structure of the steel wire, the disadvantage that the head end of the guide wire and catheter cannot be actively bent to match the structure of the human body organs cannot be changed. Therefore, the operation is highly dependent on the experience of senior doctors who twist and pull the external end of the guide wire and catheter to transmit the action to the head end of the guide wire and catheter in the body 1-2 meters away. The friction, motion lag and different degrees of tissue damage risk in this process are foreseeable;

[0005] 2) In the industrial and military fields, if it is necessary to view the internal conditions of complex machines or pipelines without disassembly, if there is a flexible long pipe structure with a head segment that can be controlled to steer like a snake, and if the head and the internal pipe are added with optical fiber lighting and imaging components, it will be more convenient to carry out maintenance work.

[0006] 3) Similar principles can be applied to underground exploration, marine engineering and other industries in areas where space is particularly narrow or personnel cannot reach. This should be a new technical solution with high controllability, high flexibility and low cost.

[0007] The key to realizing the above application scenarios is the flexible pipe head segment, which is the steerable structure that can be controlled to steer. This is the core of the present patent.

[0008] Current technical problems:

[0009] The existing controlled steering structure on the market is mostly of the cable type, that is, by alternately pulling the multiple cables that penetrate the pipe body, the head segment is bent and deformed. It has some limitations:

[0010] 1) Since the cable needs to be bent multiple times along with the pipe body in the working object, in addition to the conventional friction, the cable will also bear additional resistance when pulled, which will affect the feel and flexibility of the operation;

[0011] 2) In order to make the action of the pull cable to be transmitted to the head section of the tube body as much as possible, the middle and rear section of the tube body needs to have certain hardness to avoid its deformation under pulling. However, such hardness may affect the flexibility of the tube body to serpentine through, and on the other hand, the hardness being too high may exceed the bearing capacity of the working object. For example, most of the vascular interventional surgeries cannot use the pull cable type catheter;

[0012] 3) In order to ensure the strength and service life of the pull cable, the pull cable itself cannot be too thin, and the middle and rear section of the tube body needs to have certain strength to resist the deformation under pulling of the pull cable. The two are superimposed, and the tube body of the pull cable type controlled steering structure cannot be very thin, which limits its application in certain fields. SUMMARY

[0013] The technical problem solved by the present application is to provide an electrically controlled memory alloy controlled steering tubular member. By passing current through the memory alloy tube, the temperature of the memory alloy tube is switched between the phase transition temperature through electrothermal effect, realizing the controlled motion function, and further meeting different needs, such as being applied to medical electrically controlled catheters, guide wires, and underground exploration fields requiring operation in a narrow space.

[0014] To solve the above technical problems, one technical scheme adopted by the present application is that the present application provides an electrically controlled memory alloy controlled steering tubular member, which comprises a catheter body and two electrodes. The catheter body comprises a section of memory alloy tube. One end of one electrode is connected with the head end of the memory alloy tube, and the electrode is defined as a head electrode. One end of the other electrode is connected with the tail end of the memory alloy tube, and the electrode is defined as a tail electrode.

[0015] The memory alloy tube is a hollow tube wound by a single strand or multiple strands of memory alloy wire, and the hollow tube is a hollow capillary tube similar to a spring tube.

[0016] The other end of the catheter body is directly or indirectly connected with a male connector, and the other ends of the two electrodes are simultaneously electrically connected with the male connector.

[0017] Further, one end of the head electrode is connected with the head of the memory alloy tube, the other end of the electrode passes through the inside of the catheter body and extends out of the tail of the catheter body, one end of the tail electrode is connected with the tail of the memory alloy tube, and the other end of the tail electrode extends out.

[0018] Further, one end of the head electrode is wound into the hollow tube together with the memory alloy wire, and the other end of the head electrode is led out of the catheter body.

[0019] Alternatively, the head electrode is spirally wound on the outer surface of the catheter body.

[0020] Further, the tail of the memory alloy pipe is welded with a guide pipe made of stainless steel wire, and the male connector is located at the end of the guide pipe.

[0021] Further, the inside of the male connector is embedded with a conductive ring, one end of the electrode is electrically connected with the conductive ring, and one end of the male connector is fixedly connected with the tail end of the catheter body.

[0022] The female connector used in cooperation with the male connector comprises a socket body, a conductive spring ring with clamping force and a wire, and the inner circumferential surface of the socket body is provided with a looped groove, and the conductive spring ring is installed in the groove.

[0023] After the female connector is inserted into the male connector, the conductive spring ring is electrically connected with the conductive ring, and the conductive spring ring is connected with one end of the wire.

[0024] Further, the male connector is sleeved on the outer circumferential surface of the catheter body, and the outer surface of the male connector forms a limiting holding section facilitating the taking of the tubular member.

[0025] The application also provides an application of the electrically controlled memory alloy controlled steering tubular member as a medical electrically controlled catheter, both ends of the catheter body are open, and a channel is formed in the middle of the catheter body.

[0026] The inner wall surface of the catheter body is provided with an inner bushing, and the outer wall surface is provided with an outer bushing.

[0027] Further, the outer surface of the catheter body is covered with an inner layer, and the inner layer is a PTFE coating or a heat-shrinkable film.

[0028] The outer surface of the inner layer is covered with an outer layer, and the outer layer is a functional coating.

[0029] The application also provides an application of the electrically controlled memory alloy controlled steering tubular member as a medical electrically controlled guide wire, and the head of the memory alloy pipe is formed into a hemispherical melting head.

[0030] Further, the outer surface of the catheter body is covered with an inner layer, and the inner layer is a PTFE coating or a heat-shrinkable film.

[0031] The outer surface of the inner layer is covered with an outer layer, and the outer layer is a functional coating.

[0032] The application has the following beneficial effects:

[0033] The application realizes the controlled movement function by heating the memory alloy tube through electricity, and switching the temperature of the memory alloy tube between the phase transition temperature through electricity, thereby meeting different needs, such as being applied to medical electric control catheters, guide wires, and underground exploration, and the like, which need to be operated in a narrow space.

[0034] For example, when being used as a medical electric control catheter, the size of the current of the external device is controlled, the catheter is stretched in the blood vessel, and travels according to the required direction and angle, the hollow channel of the catheter is used to deliver medicine or medical equipment to the lesion, and the patient's pain and operation difficulty are reduced.

[0035] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and the content of the specification can be implemented, the following preferred embodiments of the application are described in detail with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic diagram of embodiment 1 of the application;

[0037] Figure 2 is a structural schematic diagram of embodiment 1 of the application;

[0038] Figure 3 is an appearance diagram of a male end connector of embodiment 1 of the application;

[0039] Figure 4 is an axial sectional view of a female end connector of embodiment 1 of the application;

[0040] Figure 5 is a structural schematic diagram of a catheter body of embodiment 2 of the application;

[0041] Figure 6 is a structural schematic diagram of embodiment 3 of the application (without a male end plug);

[0042] Figure 7 is an axial sectional schematic diagram of embodiment 3 of the application (without a male end plug);

[0043] Figure 8 is a movement state diagram of a medical electric control catheter of embodiment 3 of the application;

[0044] Figure 9 is an appearance diagram of embodiment 4 of the application;

[0045] Figure 10 is an axial sectional view of embodiment 4 of the application;

[0046] Figure 11 is one of movement state diagrams of embodiment 4 of the application;

[0047] Figure 12 This is the second motion state diagram of Embodiment 4 of the present invention;

[0048] Figure 13 This is the third motion state diagram of Embodiment 4 of the present invention. Detailed Implementation

[0049] The following specific embodiments illustrate the detailed implementation of the present invention. Those skilled in the art can easily understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented in other different ways, that is, different modifications and changes can be made without departing from the scope disclosed in the present invention.

[0050] Example 1: An electronically controlled shape memory alloy controlled steering tubular component, such as... Figures 1 to 4 As shown, the tubular component includes a conduit body and two electrodes. The conduit body includes a shape memory alloy tube 101, wherein one end of one electrode is connected to the head end of the shape memory alloy tube and is defined as the head electrode 1031; one end of the other electrode is connected to the tail end of the shape memory alloy tube and is defined as the tail electrode 1032.

[0051] The shape memory alloy tube is a hollow tube made of one or more strands of shape memory alloy wire wound together, and the hollow tube is a hollow capillary tube similar to a Bourdon tube.

[0052] The other end of the catheter body is directly or indirectly connected to the male connector 102, and the other ends of the two electrodes are simultaneously electrically connected to the male connector.

[0053] The following are three methods for electrode lead-out, but are not limited to these. The goal is to achieve electrode lead-out without interfering with the function of the tubular component. The main considerations are as follows:

[0054] Two electrodes are connected to the two ends of the memory alloy tube respectively, so that the current can flow through the memory alloy tube effectively, so that it can give full play to the electrothermal effect, heat evenly, and facilitate the overall movement of the memory alloy tube.

[0055] Except for the solder joints where the electrode wires are welded to the memory tube, all other parts of the wires must be insulated to prevent short circuits from affecting the heating effect or even burning out the wires.

[0056] For extremely thin catheter bodies, the electrode wires can be directly welded to the tube wall to serve as electrodes; for catheter bodies operating in a single motion mode, a stainless steel wire guide tube 105 can be used to replace the tail electrode (referring to the situation in Embodiment 2, such as...). Figure 5 (As shown).

[0057] The three methods for electrode extraction are as follows:

[0058] The first kind: two electrodes are defined as head electrode 1031 and tail electrode 1032, one end of the head electrode is connected with the head of the memory alloy pipe, the other end of the electrode passes through the inside of the catheter body and extends from the tail of the catheter body; one end of the tail electrode is connected with the tail of the memory alloy pipe, and the other end of the tail electrode extends out.

[0059] That is, the wire of the electrode is located inside the tubular body, which can better protect the electrode (including the wire) from external factors, but at the same time requires that the inside of the catheter body cannot have components that need to move frequently. For example: the head end of the electrically controlled memory tubular member is arranged with a camera, and only signal lines are arranged in the pipe, so that there is no mutual interference. For example, in embodiment 4, when the tubular member is used as a medical electrically controlled guide wire, no medicine or other instruments need to pass through the inside of the tubular member, so the first kind of electrode connection structure can be used;

[0060] The second kind: one end of the head electrode is wound together with the memory alloy wire to form the hollow pipe, and the other end of the electrode is led out of the catheter body.

[0061] If it is desired that the inner and outer layers of the electrically controlled memory tubular member are particularly smooth and extremely thin, the wire of the electrode with an insulating layer can be wound together with the memory alloy wire to form a hollow pipe, and the wire of the electrode and the memory alloy wire are fused together by laser welding at a place where the electrode needs to be led out, to form a conductive loop. More preferably, for medical intervention purposes, a platinum-tungsten developing wire can also be wound together.

[0062] The third kind: the head electrode 1031 is spirally wound on the outer surface of the tubular member, as shown in Figure 5 The tail end of the catheter body is also welded with a guide pipe 105 in this figure, which is described in detail in embodiment 2, the tail electrode 1032 is connected with the tail of the memory alloy pipe and directly passes through the guide pipe and extends out from the other end;

[0063] This can form an unobstructed channel in the middle of the electrically controlled memory tubular member, which is convenient for delivering goods or liquid. When the wire of the electrode is located on the outer layer, a thin and elastic polymer protective layer needs to be formed on the outside of the electrode by using heat shrinkage, dipping or extrusion process. More preferably, in order to save the material of the electrode, the pitch of the electrode winding is relatively large.

[0064] In this embodiment, a conductive ring 1021 is embedded in the inside of the male connector 102, one end of the electrode is electrically connected with the conductive ring, and one end of the male connector is fixedly connected with the tail end of the catheter body.

[0065] The female connector 104, which is used in cooperation with the male connector, includes a socket body 1041 (e.g., made of injection molding material), a conductive spring ring 1042 with clamping force, and a wire 1043, an inner circumferential surface of the socket body is provided with a groove in a circle, and the conductive spring ring is installed in the groove;

[0066] After the female connector is inserted into the male connector, the conductive spring ring is electrically connected with the conductive ring, and one end of the wire is connected with the conductive spring ring. The other end of the wire extends to the other device connector.

[0067] The male connector is sleeved on the outer circumferential surface of the catheter body, and an outer surface of the male connector forms a limiting holding section 1022 for facilitating the taking of the tubular member. In the embodiment, a tail portion of the limiting holding section is further provided with a ring of bosses 1023 for limiting.

[0068] The above male connector can realize three performance indicators of structural connection, stable conduction, and no reduction of inner diameter passage after connection, and the specific performance is as follows:

[0069] 1) The male connector and the counterpart (the female connector) connected therewith adopt a plug-in connection mode, so that the structural connection is realized, and the target of no reduction of the inner diameter passage is ensured;

[0070] 2) The male connector includes a high-molecular sleeve with high strength, and a stamping conductive ring with a specific shape (for connection and conduction with the electrode), which can be connected with the end of the catheter body (or the end of the guide tube, which is the structure of the embodiment 2) by ultrasonic welding.

[0071] 1. The electrically controlled memory alloy controlled steering tubular member (referred to as electrically controlled tubular member) needs to normally play a guiding role, and the core lies in the structure and performance of the memory alloy tube;

[0072] 1) The single or multi-strand nickel-titanium memory alloy wire with different diameters is wound into a tubular shape, which will bring different softness, toughness, strength, and steering force, and the specific parameters are set according to the application scene;

[0073] 2) After the phase change temperature adjustment process, the memory alloy tube will have the performance of mutual transformation between austenite and martensite within a specific phase change temperature range (generally a temperature difference of 5-20℃);

[0074] 3) After the steering function training process, the memory alloy tube will have the performance of multiple motion modes (such as planar rotation, axial extension or torsion around the axis) when austenite and martensite phase change

[0075] 4) To achieve the superposition of multiple motion modes, multiple different single motion mode memory alloy pipes can be butt-welded in series, and electrodes and wires are arranged respectively. For example, two memory alloy pipes for plane rotation and axial torsion are butt-welded, and rotation or torsion is realized by controlling different wire loops and current sizes (different currents result in different temperatures), or rotation is realized at the same time as torsion.

[0076] Embodiment 2: An electrically controlled memory alloy controlled steering tubular, similar to Embodiment 1, except that, as shown in Figure 5 The tail of the memory alloy pipe 101 is welded with a guide pipe 105 made of stainless steel wire, and the male end connector is located at the end of the guide pipe. For example, the length of the memory alloy pipe is 5 mm, and the length of the guide pipe is 45 mm.

[0077] Since the strength of the stainless steel wire is better than that of the memory alloy wire, this structure can provide the strength and support of the electrically controlled memory pipe at a relatively low cost, and conduct the power of the whole pipe to move forward and backward. Especially when the length of the tubular is relatively long, the advantage of this structure is more obvious. The head of the tubular is still a hollow pipe formed by memory alloy wire, which plays a role of being electrically controlled and steering, and the rear guide pipe plays the role of strengthening and supporting as described above.

[0078] Embodiment 3: The application of the electrically controlled memory alloy controlled steering tubular as a medical electrically controlled catheter, similar to Embodiment 1 and Embodiment 2, except that, as shown in Figure 1 、 Figure 6 and Figure 7 The two ends of the catheter body (in the figure, the catheter body is taken as an example including only the memory alloy pipe 101, of course, a guide pipe can also be butt-welded) are open; the middle of the catheter body forms a channel 1011; the channel can be used to deliver minimally invasive surgical instruments and drugs, etc.

[0079] The inner wall surface of the catheter body is provided with an inner sleeve 301, and the outer wall surface is provided with an outer sleeve 302.

[0080] The outer surface of the catheter body is covered with an inner layer 303, which is a PTFE coating or a heat-shrinkable film;

[0081] The outer surface of the inner layer is covered with an outer layer 304, which is a functional coating.

[0082] The inner layer mainly plays the roles of insulation, isolation of metal from human tissue contact, increase of toughness, etc.; and the outer layer plays the roles of reduction of friction, protection of the inner wall of the blood vessel, and enhancement of passability, etc. To ensure the smoothness of the medical electrically controlled catheter in the blood vessel intervention, protect the blood vessel, and exclude the influence of bioelectricity on the blood vessel, etc.

[0083] In this embodiment, the inner sleeve and the outer sleeve are respectively a layer of high polymer material such as TPU, PTFE or Pebax;

[0084] The thickness of the inner sleeve and the outer sleeve is respectively 0.015-0.40 mm. The function of the inner sleeve is to facilitate the smooth passing of drugs and the like into the required position through the catheter. If the inner sleeve is not contained, the drugs may react with the shape memory alloy wire by chemical action, and the instrument may be poked into the seam of the pipe wall, which will increase the operation risk.

[0085] In this embodiment, the catheter body is provided with a developing mark 305. The above developing mark can be a developing ring welded on the outside of the guide wire body, or can be replaced by a platinum-tungsten developing wire. Together with the electrode and the shape memory alloy wire, it is wound into a shape memory alloy tube, further improving integration and miniaturization.

[0086] In this embodiment, the wire diameter of the shape memory alloy wire is 0.05-0.25 mm, and the tube diameter of the catheter body is 1.0-5.0 mm.

[0087] In this embodiment, the shape memory alloy wire is an electrically controlled shape memory alloy wire with a temperature of 37.5-42℃.

[0088] The medical electrically controlled catheter greatly reduces the control temperature. The control temperature is reduced from the original 45-60℃ to 37.5-42℃. This temperature range is basically consistent with the body temperature of the human body, and there is no risk of changes and damage to proteins and other components in the blood caused by high temperature.

[0089] Since the catheter body and the electrode of the medical electrically controlled catheter are covered between the inner sleeve and the outer sleeve made of high polymer material, there is no direct contact with the human body, so there is no need to worry about the influence of the micro-current on the human body, and the biocompatibility and safety of the catheter.

[0090] The working principle and working process are as follows:

[0091] The principle of the medical electrically controlled catheter is to cleverly use the characteristic that the shape memory alloy changes its shape in a memory manner when it undergoes a phase change reaction accompanied by temperature change. By increasing the single or multi-strand shape memory alloy wire implanted in the interlayer between the inner sleeve and the outer sleeve of the head section of the medical electrically controlled catheter, a catheter is wound. When the electrode is electrified, the shape memory alloy tube changes in temperature due to the electric heating reaction, thereby triggering the phase change reaction, so that the head section of the catheter presents different shapes and bending radii, meeting the requirement of controlled bending of the catheter head section as needed during the operation process.

[0092] The control logic of the medical electrically controlled catheter is to adjust different voltage and current, so that the head section of the catheter changes in different temperatures, and the head section of the catheter will show different shapes and motion behaviors under different temperatures according to the pre-setting. For example, it makes 360° reciprocating bending in a two-dimensional plane, as shown in Figure 8 The temperature of the electrically controlled catheter is higher and higher from left to right.

[0093] Compared with the pure mechanical transmission mode of the traditional catheter, the control of the electrically controlled medical catheter directly acts on the head section of the catheter in an electronic manner, which is more accurate and fast, and is not affected by the length of the catheter. In theory, it can support remote surgery beyond ten thousand miles with the help of surgical robots.

[0094] Embodiment 4: The application of the electrically controlled memory alloy controlled turning tubular member as a medical electrically controlled guide wire, which is similar to the structure of Embodiment 1 and Embodiment 2, except that as shown in Figure 9 and Figure 10 The head of the memory alloy tube forms a semi-spherical melting head 401. The melting head can be formed by welding one end of the memory alloy tube.

[0095] The guide wire is a common and essential consumable for vascular intervention, and its basic function is to pass through the winding blood vessels and organs of the human body between the blood vessel entrance and the patient's lesion site by using its small and flexible characteristics. The guide wire is more to establish a channel so that the subsequent medical catheter and minimally invasive surgical instruments can reach the lesion site along the channel.

[0096] The smooth semi-spherical melting head formed at the head of the catheter body reduces the resistance and friction of the medical electrically controlled guide wire in the blood vessel.

[0097] In this embodiment, the wire diameter of the memory alloy wire is 0.05-0.25mm, and the tube diameter of the catheter body is 0.3-4.0mm. The outer diameter of the thinnest medical electrically controlled guide wire can be made to 0.30mm, which meets the needs of the current most delicate neurointerventional surgery.

[0098] In this embodiment, the main material of the memory alloy wire is nickel-titanium alloy, which has excellent biocompatibility and safety.

[0099] In this embodiment, preferably, the outer surface of the memory alloy tube is covered with an inner layer 303, and the inner layer is a PTFE coating or a heat-shrinkable film.

[0100] The outer surface of the inner layer is covered with an outer layer 304, and the outer layer is a functional coating. The materials and functions of the inner layer and the outer layer are similar to those of Embodiment 3.

[0101] The function and function of the developing marker 305 are also similar to those of Embodiment 3.

[0102] In the embodiment, preferably, the memory alloy wire is a memory alloy wire with an electrically controlled temperature of 37.5-42 DEG C.

[0103] The operation temperature of the medical electrically controlled guide wire in the embodiment is lowered from the original 45-60 DEG C to 37.5-42 DEG C. This temperature range is basically consistent with the body temperature of human beings, and there is no risk of change and damage of proteins and other components in blood caused by high temperature. The medical electrically controlled guide wire can realize 360 DEG plane bending, 720 DEG axial rotation and more than 20% stretching and contracting within a temperature range of 5 DEG C, and the fastest response speed is within 0.3 seconds. It is very sensitive and can be used in a large scale with small materials.

[0104] The voltage of the micro medical electrically controlled guide wire in the embodiment is below 2V, and the current is 0.005-0.05A, which has little effect on the bioelectric field of human beings.

[0105] The principle of the medical electrically controlled guide wire is to skillfully use the characteristics of the memory alloy that the shape changes back and forth when the phase change reaction occurs with the change of temperature. By implanting electrodes in the head section of the medical electrically controlled guide wire, the guide wire becomes part of the circuit. When the electrodes are powered on, the guide wire changes in temperature due to the electrothermal reaction, and then triggers the phase change reaction, so that the head section of the guide wire presents different shapes and bending radii, meeting the requirements of the head section of the guide wire bending as needed during the operation.

[0106] The control logic of the medical electrically controlled guide wire is to adjust different voltage and current, so that the head section of the guide wire changes in temperature, and the head section of the guide wire presents different shapes and motion behaviors according to the pre-set at different temperatures. For example, the guide wire makes 360 DEG reciprocating bending in a two-dimensional plane, as shown in Figure 11 from left to right, indicating that the electrically controlled temperature increases; or makes rotating or stretching and contracting along the central axis of the guide wire, as shown in Figure 12 from left to right, indicating that the electrically controlled temperature increases; or makes rotating and stretching and contracting at the same time, as shown in Figure 13 .

[0107] The above only describes the embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structure or direct or indirect application in other related technical fields based on the content of the specification and drawings of the present application is also included in the patent protection range of the present application.

Claims

1. An electrically controlled memory alloy controlled steering tubular, characterized in that: the tubular comprises a catheter body and two electrodes, the catheter body comprising a section of memory alloy tube, one end of one electrode being connected to the head end of the memory alloy tube and defining the electrode as a head electrode, one end of the other electrode being connected to the tail end of the memory alloy tube and defining the electrode as a tail electrode; the memory alloy tube is a hollow tube wound from a single or multiple strands of memory alloy wire, the hollow tube being a hollow capillary tube similar to a spring tube; the other end of the catheter body is directly or indirectly connected to a male connector, the inside of the male connector being embedded with a conductive ring, the other end of the two electrodes being electrically connected to the conductive ring, one end of the male connector being fixedly connected to the tail end of the catheter body; a female connector used in conjunction with the male connector comprises a socket body, a conductive spring ring with clamping force, and a wire, the inner circumferential surface of the socket body being provided with a circumferential groove, the conductive spring ring being installed in the groove; after the female connector is inserted into the male connector, the conductive spring ring is electrically connected to the conductive ring, and the conductive spring ring is connected to one end of the wire; the male connector is sleeved on the outer circumferential surface of the catheter body, and the outer surface of the male connector forms a limiting holding section for easy holding of the tubular.

2. The electrically controlled memory alloy controlled steering tubular according to claim 1, characterized in that: one end of the head electrode is connected to the head of the memory alloy tube, the other end of the head electrode passing through the inside of the catheter body and extending out of the tail of the catheter body; one end of the tail electrode is connected to the tail of the memory alloy tube, and the other end of the tail electrode extends out.

3. The electrically controlled memory alloy controlled steering tubular according to claim 1, characterized in that: one end of the head electrode is wound into the hollow tube at the same time as the memory alloy wire, and the other end of the head electrode is led out of the catheter body; or the head electrode is spirally wound on the outer surface of the catheter body.

4. The electrically controlled memory alloy controlled steering tubular according to claim 1, characterized in that: a guide tube made of a section of stainless steel wire is welded to the tail of the memory alloy tube, and the male connector is located at the end of the guide tube.

5. The electrically controlled memory alloy controlled steering tubular according to any one of claims 1 to 4, characterized in that: both ends of the catheter body are open; a channel is formed in the middle of the catheter body; an inner bushing is provided on the inner wall surface of the catheter body, and an outer bushing is provided on the outer wall surface.

6. The electrically controlled memory alloy controlled steering tubular according to claim 5, characterized in that: an inner layer is covered on the outer surface of the catheter body, the inner layer being a PTFE coating or a heat-shrinkable film; an outer layer is covered on the outer surface of the inner layer, the outer layer being a functional coating.

7. The electrically controlled memory alloy controlled steering tubular according to any one of claims 1 to 4, characterized in that: the head of the memory alloy tube forms a semi-spherical melt head.

8. The electrically controlled memory alloy controlled steering tubular according to claim 7, characterized in that: An outer surface of the catheter body is covered with an inner layer, which is a PTFE coating or a heat shrink film; An outer surface of the inner layer is covered with an outer layer, which is a functional coating.

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