Single coil vapor ablation device needle exit module and medical device

Abstract

This utility model relates to the field of medical device technology, providing a needle outlet module and medical device for a single-coil steam ablation device. The needle outlet module includes a frame, a coil, a permanent magnet, and a puncture needle. The frame has a movable space and a puncture outlet connected to the movable space. The coil is wound around the frame and includes a first segment and a second segment connected in series. The first and second segments are spaced apart along the axial direction of the frame, with the first segment wound in the forward direction and the second segment wound in the reverse direction. The permanent magnet is movably disposed in the movable space. The puncture needle is disposed at the end of the permanent magnet facing the puncture outlet. The coil is adapted to be energized to drive the permanent magnet to move the puncture needle, causing the puncture needle to extend out of the puncture outlet or retract into the movable space. This utility model achieves bidirectional linear drive in a single-coil structure by using a two-segment coil with forward and reverse directions arranged axially spaced in cooperation with the permanent magnet. It has the advantages of compact structure, uniform magnetic field distribution, stable puncture movement, and precise depth control.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a needle delivery module and medical device for a single-coil steam ablation device. Background Technology

[0002] In the medical field, the technology of using the latent heat released by the phase change of steam to kill diseased tissues and cells is becoming a research hotspot, and corresponding steam ablation equipment is also receiving widespread attention. To reliably deliver steam to human tissues, in certain indications, a puncture needle carrying steam and capable of internal flow is required. This allows for targeted steam delivery by puncturing the diseased tissue, thereby improving treatment efficacy and reducing damage to normal tissues. Currently, the main puncture methods have the following technical limitations: While manual puncture is simple in structure, inexpensive, and allows for flexible puncture depth, it suffers from slow operation, intense patient pain, and uneven wounds, potentially leading to poor prognosis. Electromagnetic puncture methods, on the other hand, have drawbacks such as difficulty in immobilization, high structural strength requirements, and inflexible puncture depth adjustment. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes a needle-exit module for a single-coil steam ablation device, which has the advantages of compact structure, uniform magnetic field distribution, stable puncture movement, and precise depth control.

[0004] This utility model also proposes a medical device.

[0005] According to a first aspect embodiment of the present invention, the needle output module of the single-coil steam ablation device includes: The frame has an active space and a puncture exit communicating with the active space; A coil, the coil being wound around the frame body, the coil comprising a first segment and a second segment connected in series, the first segment and the second segment being spaced apart along the axial direction of the frame body, the first segment being wound in the forward direction and the second segment being wound in the reverse direction; A permanent magnet, which is movably disposed in the active space; A puncture needle is disposed at one end of the permanent magnet facing the puncture outlet. The coil is adapted to be energized to drive the permanent magnet to move the puncture needle, so that the puncture needle extends out of the puncture outlet or retracts into the movable space.

[0006] According to the embodiment of this utility model, the needle-exit module of the single-coil steam ablation device cooperates with a permanent magnet through a pair of positive and negative dual-segment coils arranged axially at intervals. It achieves bidirectional linear drive under the single-coil structure, which simplifies the device structure and optimizes the magnetic field distribution. It has the advantages of compact structure, uniform magnetic field distribution, stable puncture movement and precise depth control.

[0007] According to one embodiment of the present invention, the outer wall of the frame is provided with a first positioning groove and a second positioning groove, the first segment is wound in the first positioning groove, and the second segment is wound in the second positioning groove.

[0008] According to one embodiment of the present invention, the first segment and the second segment have the same number of turns.

[0009] According to one embodiment of the present invention, the lengths of the first segment and the second segment are defined as d, and the length of the permanent magnet is m, which satisfies m≥d>m / 2.

[0010] According to one embodiment of the present invention, a first blocking member is provided at one end of the frame, the first blocking member is provided at the puncture outlet, and the first blocking member is used to prevent the permanent magnet from extending out of the puncture outlet.

[0011] According to one embodiment of the present invention, a second blocking member is provided at the end of the frame away from the puncture outlet, and the second blocking member is located at the end of the coil away from the puncture outlet. The second blocking member is used to stop the end of the permanent magnet from being away from the puncture needle.

[0012] According to one embodiment of the present invention, the permanent magnet is hollow.

[0013] According to one embodiment of the present invention, the end of the frame away from the puncture outlet is provided with an installation port that connects to the active space.

[0014] According to one embodiment of the present invention, the needle-out module of the single-coil steam ablation device further includes a first connecting pole and a second connecting pole. The first connecting pole is connected to one end of the coil, and the second connecting pole is connected to the other end of the coil. The first connecting pole and the second connecting pole are used to connect to the drive circuit.

[0015] According to a second aspect of the present invention, a medical device includes a device body and the aforementioned single-coil steam ablation device needle outlet module, wherein the single-coil steam ablation device needle outlet module is connected to the device body.

[0016] The medical device according to the present invention includes the above-mentioned single-coil steam ablation device needle delivery module, and therefore has all the technical effects of the above-mentioned single-coil steam ablation device needle delivery module, which will not be repeated here.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the needle output module of the single-coil steam ablation device provided in this embodiment of the utility model.

[0020] Figure 2 This is a schematic diagram of the frame provided in an embodiment of the present utility model.

[0021] Figure 3 This is a schematic diagram showing the positional relationship of the needle outlet module in the single-coil steam ablation device provided in this embodiment of the utility model.

[0022] Figure 4 This is a schematic diagram of a full-bridge drive circuit composed of NMOS transistors.

[0023] Figure 5 This is a topology diagram of the needle output module of the single-coil steam ablation device provided in this embodiment of the utility model.

[0024] Figure label: 1. Frame; 11. Activity space; 111. Puncture outlet; 112. Installation port; 12. First positioning groove; 13. Second positioning groove; 14. First blocking element; 15. Second blocking element; 2. Coil; 21. First section; 22. Second section; 3. Permanent magnet; 4. Puncture needle; 5. First connecting pole; 6. Second connecting pole. Detailed Implementation

[0025] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0026] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0028] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] Please refer to the reference. Figures 1 to 3 This application proposes a single-coil 2 steam ablation device needle delivery module, comprising: a frame 1, the frame 1 having an active space 11 and a puncture outlet 111 communicating with the active space 11; a coil 2, the coil 2 being wound around the frame 1, the coil 2 including a first segment 21 and a second segment 22 connected in series, the first segment 21 and the second segment 22 being spaced apart along the axial direction of the frame 1, the first segment 21 being wound in the forward direction and the second segment 22 being wound in the reverse direction; a permanent magnet 3, the permanent magnet 3 being movably disposed in the active space 11; and a puncture needle 4, the puncture needle 4 being disposed at the end of the permanent magnet 3 facing the puncture outlet 111, the coil 2 being adapted to be energized to drive the permanent magnet 3 to move the puncture needle 4, so that the puncture needle 4 extends out of the puncture outlet 111 or retracts into the active space 11.

[0031] The frame 1 is a rigid structure that supports the coil 2 and defines the movement path of the permanent magnet 3. It can be implemented using an injection-molded engineering plastic shell. Its internal movable space 11 and the puncture exit 111 form a linear guide channel, ensuring the permanent magnet 3 moves along a predetermined axial direction. The forward and reverse winding of the coil 2 refers to the two sections of wire being wound in opposite directions. This can be achieved using clockwise and counterclockwise winding processes, with series connection causing the current to generate magnetic fields in opposite directions in the two sections of coil 2. The permanent magnet 3 is movably positioned within the movable space 11, meaning a gap is maintained between the permanent magnet 3 and the frame 1. This can be achieved by using a cylindrical neodymium iron boron magnet with a polytetrafluoroethylene liner to achieve low-friction sliding. The connection between the puncture needle 4 and the permanent magnet 3 means that they are fixed by threads or adhesive.

[0032] Specifically, when coil 2 is energized, the first section 21 wound in the forward direction and the second section 22 wound in the reverse direction generate magnetic fields in opposite directions, forming an alternating magnetic field polarity distribution along the axial direction. Under the influence of the gradient magnetic field, the permanent magnet 3 experiences axial thrust, causing the puncture needle 4 to move in the direction of decreasing magnetic field strength. By switching the current direction, the order of magnetic field polarity between the two sections of coil 2 can be changed, causing the permanent magnet 3 to move in the opposite direction. Because the two sections of coil 2 are axially spaced, their magnetic field area matches the length of the permanent magnet 3. When the permanent magnet 3 moves to the end of coil 2, the magnetic field strength rapidly decays, forming a braking force, achieving precise positioning without mechanical obstruction. The extension and retraction of the puncture needle 4 are accomplished by switching a single current direction, and the movement path is defined by the movable space 11 of the frame 1.

[0033] like Figure 2 As shown, this application further proposes that the outer wall of the frame 1 is provided with a first positioning groove 12 and a second positioning groove 13, the first segment 21 is wound in the first positioning groove 12, and the second segment 22 is wound in the second positioning groove 13.

[0034] The first positioning groove 12 refers to the groove structure axially spaced on the outer wall of the frame 1, which can be formed by machining or injection molding, and is used to define the starting position of the forward-winding coil 2 segment. The second positioning groove 13 refers to the groove structure distributed at intervals with the first positioning groove 12, which can be formed by the same process, and is used to fix the ending position of the reverse-winding coil 2 segment. The depth and width of the positioning groove can be adjusted according to the diameter of the coil 2 to ensure that the coil 2 does not undergo lateral displacement after being embedded.

[0035] Specifically, during the winding of coil 2, the first segment 21 of coil 2 is guided into the first positioning groove 12 and completed in the forward winding along the groove's direction; the second segment 22 of coil 2 starts from the second positioning groove 13 and is completed in the reverse winding in the opposite direction. During the winding process of coil 2, the operator only needs to press the wire into the corresponding groove to complete the positioning, without relying on external measuring tools. The direction of the superimposed magnetic field formed in this way coincides with the axis of motion of the permanent magnet 3, avoiding the dispersion of magnetic field components caused by the offset of coil 2.

[0036] This application further proposes that the number of turns in the first segment 21 and the second segment 22 are the same.

[0037] The fact that the first segment 21 and the second segment 22 have the same number of turns means that the first segment 21 coil 2, which is wound in the forward direction, and the second segment 22 coil 2, which is wound in the reverse direction, maintain the same number of turns during winding. This can be achieved using precision winding technology or automated winding equipment to ensure that the physical parameters of the two coil segments are consistent. By setting the same number of turns, the magnetic field strength generated by the forward and reverse segments when energized can be balanced, thereby eliminating the magnetic field gradient caused by the difference in the axial distribution of the coils 2.

[0038] Specifically, when coil 2 is energized, the first section 21 wound in the forward direction and the second section 22 wound in the reverse direction have the same number of turns but opposite winding directions, resulting in magnetic fields with opposite polarities but symmetrical strengths. This symmetry ensures that the electromagnetic driving force experienced by the permanent magnet 3 within the active space 11 is evenly distributed along the axial direction, avoiding fluctuations in driving force caused by differences in magnetic field strength. Consequently, the trajectory of the permanent magnet 3 becomes more linear, improving the stability of the extension or retraction of the puncture needle 4 and providing a foundation for precise control of puncture depth and rapid braking.

[0039] like Figure 3 As shown, this application further proposes to define the length of the first segment 21 and the second segment 22 as d, and the length of the permanent magnet 3 as m, which satisfies m≥d>m / 2.

[0040] Wherein, the length d of the first segment 21 and the second segment 22 refers to the total coverage area of ​​the forward and reverse winding portions of the coil 2 extending along the axial direction of the frame 1. Specifically, it can be achieved by adjusting the distribution density or axial spacing of the coil 2 windings. This parameter is designed to be related to the travel distance of the permanent magnet 3. Wherein, the length m of the permanent magnet 3 refers to the axial dimension of the effective magnetization area of ​​the permanent magnet 3 within the movable space 11 of the frame 1. Specifically, it can be achieved by selecting different specifications of permanent magnet 3 materials or adjusting its assembly position. This parameter is configured to match the range of the magnetic field generated by the coil 2.

[0041] Specifically, by limiting the ratio between the total length of coil 2 and the length of permanent magnet 3, the magnetic field generated by coil 2 can completely cover the effective magnetization area of ​​permanent magnet 3. When the length of coil 2 is controlled to be more than half the length of permanent magnet 3, it ensures that the magnetic field covers at least the middle area of ​​the permanent magnet 3's movement, avoiding attenuation of driving force at the end of the movement due to insufficient magnetic field coverage. At the same time, the length of coil 2 does not exceed the limit of the length of permanent magnet 3 to prevent the magnetic field from exceeding the actual movement path of permanent magnet 3, causing energy loss or magnetic field interference.

[0042] This application further proposes a technical solution of setting a first blocking member 14 at the puncture outlet 111 end of the frame 1, which is used to limit the movement stroke of the permanent magnet 3.

[0043] The first blocking element 14 at one end of the frame 1 refers to the rigid limiting structure set at the end of the path of the puncture needle 4. Specifically, it can be achieved by using an annular flange or a limiting buckle. This structure generates mechanical interference by contacting the permanent magnet 3. This arrangement ensures that the permanent magnet 3 is immediately blocked when it moves to the preset limit position.

[0044] Specifically, when the coil 2 is energized and drives the permanent magnet 3 to move toward the puncture outlet 111, the permanent magnet 3 drives the puncture needle 4 to extend outward. When the puncture needle 4 reaches its maximum designed stroke, the front end of the permanent magnet 3 makes rigid contact with the first blocking member 14, and the kinetic energy of the movement is completely absorbed by the mechanical blocking structure.

[0045] This application further proposes to provide a second blocking member 15 at the end of the frame 1 away from the puncture outlet 111. The second blocking member 15 is located at the end of the coil 2 away from the puncture outlet 111 and is used to stop the permanent magnet 3 from the end away from the puncture needle 4.

[0046] The second blocking element 15 refers to a physical limiting structure installed at the end of the frame 1 and perpendicular to the direction of movement of the permanent magnet 3. It can be implemented using an annular flange or an elastic pad, and its function is to form a rigid contact surface during the retraction of the permanent magnet 3. The end of the coil 2 furthest from the puncture outlet 111 refers to the end region of the coil 2 winding. This can be achieved by limiting the axial distance between the winding termination position of the coil 2 and the second blocking element 15, ensuring that the permanent magnet 3 completes its trajectory within the magnetic field's range.

[0047] Specifically, when coil 2 is de-energized or a reverse current is applied, permanent magnet 3 moves away from the puncture exit 111 under the action of the reverse magnetic field or inertia. At this time, the end of permanent magnet 3 away from the puncture needle 4 comes into contact with the second blocking member 15, forming a mechanical limit. This limiting action, together with the reverse magnetic field generated by coil 2, forms a synergistic braking, stopping the retraction of permanent magnet 3 at a predetermined position. Since the second blocking member 15 is located on the outer side of the end of coil 2, permanent magnet 3 remains within the effective magnetic field coverage area of ​​coil 2 throughout its movement, avoiding the risk of demagnetization due to separation from the magnetic field.

[0048] This application further proposes a hollow structure for the permanent magnet 3. The hollow structure refers to the formation of a cavity structure within the permanent magnet 3, which can be achieved using through holes or blind holes with cylindrical, rectangular, or polygonal cross-sections. The cavity extends along the direction of movement of the permanent magnet 3. The hollow structure reduces the volume of the permanent magnet 3 material, lowering its overall mass, thereby reducing motion inertia and improving the driving response speed. Specifically, when the hollow permanent magnet 3 accelerates or decelerates under the magnetic field generated by the energized coil 2, the energy required for its motion state change is reduced due to the reduced mass. When the current direction of the coil 2 changes, the hollow permanent magnet 3, due to its reduced inertia, can more quickly stop its original motion trend and respond in the opposite direction to the new magnetic field direction.

[0049] This application further proposes to provide an installation port 112 that connects to the active space 11 at the end of the frame 1 away from the puncture outlet 111, and the diameter of the installation port 112 is larger than that of the puncture outlet 111.

[0050] The mounting port 112 refers to the opening structure located at the end of the frame 1 and communicating with the movable space 11. Specifically, it can be implemented using an annular flared opening or a stepped hole structure, providing an assembly channel for the permanent magnet 3 and the puncture needle 4. The diameter difference refers to the fact that the inner diameter of the mounting port 112 is larger than the inner diameter of the puncture outlet 111. Specifically, it can be implemented using a stepped hole diameter change or a tapered transition structure, facilitating the insertion of the permanent magnet 3 into the movable space 11 from the mounting port 112 side, while limiting the guiding accuracy of the puncture outlet 111.

[0051] Specifically, the permanent magnet 3 and the puncture needle 4 move axially into the movable space 11 through the mounting port 112. The diameter of the mounting port 112 is larger than that of the puncture outlet 111, so that the permanent magnet 3 does not interfere with the puncture outlet 111 during assembly, thereby reducing the requirements for assembly accuracy. The smaller diameter of the puncture outlet 111 can constrain the movement path of the puncture needle 4, while the larger diameter of the mounting port 112 allows the permanent magnet 3 to be directly inserted axially during assembly, avoiding difficulties in disassembly and assembly due to space limitations. The movable space 11 is connected to the outside through the mounting port 112, allowing the permanent magnet 3 and the puncture needle 4 to be directly removed during maintenance without disassembling other components.

[0052] Please refer to the reference. Figures 3 to 5 This application further proposes that the needle-out module of the single coil 2 steam ablation device also includes a first connecting pole 5 and a second connecting pole 6. The first connecting pole 5 is connected to one end of the coil 2, and the second connecting pole 6 is connected to the other end of the coil 2. The first connecting pole 5 and the second connecting pole 6 are used to connect the drive circuit.

[0053] The first connecting pole 5 is a conductive component that forms an electrical connection with one end of the coil 2. It can be implemented using a metal contact or conductive terminal and is used to transmit the positive or negative signal from the driving circuit to the coil 2. The second connecting pole 6 is a conductive component that forms an electrical connection with the other end of the coil 2. It can also be implemented using a metal contact or conductive terminal and is used to transmit the negative or positive signal from the driving circuit to the coil 2. By independently setting the first connecting pole 5 and the second connecting pole 6, a closed loop is formed between the coil 2 and the driving circuit, making the current direction controllable.

[0054] Specifically, the drive circuit inputs current in different directions to the coil 2 through the first connecting pole 5 and the second connecting pole 6, causing the polarity of the magnetic field generated by the coil 2 to switch. When the drive circuit controls the current to flow from the first connecting pole 5 to the second connecting pole 6, the coil 2 generates a magnetic field in the first direction, driving the permanent magnet 3 to move the puncture needle 4 towards the puncture exit 111; when the drive circuit reverses the current direction, the coil 2 generates a magnetic field opposite to the first direction, driving the permanent magnet 3 to move the puncture needle 4 back to the active space 11. Through the rapid switching of the current direction, the movement direction and speed of the puncture needle 4 can be precisely controlled, thereby achieving rapid braking during puncture and flexibly adjusting the puncture depth.

[0055] Through the above technical solution, this application realizes rapid switching and precise control of the movement direction of the puncture needle 4, solves the problems of low braking efficiency and insufficient flexibility of puncture depth in the electromagnetic puncture module, and simplifies the connection structure between the coil 2 and the drive circuit, thereby improving the system reliability.

[0056] For example, assuming the initial state, a current in the appropriate direction is supplied to the coil 2 at the first segment 21 position of the permanent magnet 3, causing the coil 2 of the first segment 21 to generate a magnetic field in the appropriate direction. This magnetic field acts on the left magnetic pole of the permanent magnet 3, generating a force that pushes the permanent magnet 3 to move to the right. At this time, since the magnetic field at the second segment 22 is opposite to the magnetic field at the first segment 21, and the right magnetic pole of the permanent magnet 3 is opposite to the left magnetic pole, the second segment 22 also applies a pulling force to the permanent magnet 3 to move to the right. Finally, it hits the right-side blocking component, completing one movement.

[0057] It should be noted that a driving circuit for coil 2 is required to control its energization. Common driving circuits for coil 2 often use electronic switches for control, such as relays, MOSFETs, transistors, and IGBTs. For driving circuits that need to change the direction of current, a full-bridge circuit is often used. This full-bridge circuit can be constructed using MOSFETs or transistors, or it can be constructed using a single-pole double-throw relay; the principle is the same for both.

[0058] like Figure 4 The diagram shows a full-bridge driver circuit constructed from NMOS transistors. Q1 and Q4 are simultaneously controlled by one control port, while Q2 and Q3 are simultaneously controlled by another control port. At any given moment, Q1 and Q4 are either simultaneously turned on or simultaneously turned off, and Q2 and Q3 are also simultaneously turned on or simultaneously turned off. Q1 through Q4 can be turned off simultaneously, but cannot be turned on simultaneously. VCC is the positive terminal of the power supply, and the opposite terminal in the diagram is the negative terminal. The power supply provides sufficient voltage and power.

[0059] When control port 1 controls Q1 and Q4 to conduct, control port 2 controls Q2 and Q3 to turn off. Current flows from VCC through Q1 into one end of coil 2, assuming it flows into the first connecting pole 5, then flows out from the second connecting pole 6, and then flows into the negative terminal of the power supply from Q4, completing the flow of the entire circuit.

[0060] When control port 1 turns off Q1 and Q4, control port 2 turns on Q2 and Q3. Current flows from VCC through Q3 into the second connecting pole 6 of coil 2, then flows out from the first connecting pole 5, and then flows into the negative terminal of the power supply from Q2, completing the flow of the entire circuit.

[0061] When control port 1 and control port 2 simultaneously turn off the four MOSFETs, no current flows through coil 2, the stator remains stationary, and the puncture needle 4 remains stationary.

[0062] Therefore, the current magnitude and direction of coil 2 can be varied by controlling only two control ports to complete the needle advance and retraction function. Each function has a braking sequence, requiring no manual control and possessing high reliability.

[0063] At the same time, since the electromagnet has two coils 2 operating at all times, its acceleration and deceleration are very rapid, resulting in a faster puncture speed and reduced pain for the patient.

[0064] This component is modular, controlled by a microcontroller, and uses a bus structure for communication. Needle insertion and exit are controllable, and the driving force is adjustable, all controlled via the bus.

[0065] like Figure 5As shown, the most direct way to increase the driving force is to increase the current of coil 2. However, the current is limited by the winding resistance: too few turns result in too little driving force; too many turns result in too much winding resistance, which reduces the current and also reduces the driving force. Therefore, from the perspective of increasing the driving force, it is necessary to ensure a large number of turns while increasing the operating voltage. However, for systemic considerations, there is often only one input voltage. Therefore, to increase the adaptability of the module itself, the driving section is boosted.

[0066] The boost circuit is used to increase the module's supply voltage to increase the driving force. The enable terminal of the boost circuit is controlled by the control system, and the boost circuit only operates when the enable terminal level is active. To avoid unnecessary resource waste, the boost circuit remains inactive when the input / output pins are idle.

[0067] The diode D1 connected in parallel with the boost module is a feedforward diode, which improves the response time of the module: when the output of the boost circuit has not yet been established, the current supplies power to the full bridge from the diode, which magnetizes the coil 2 in advance. Since the coil 2 exhibits inductive characteristics, magnetization takes time. When the magnetization is almost complete, the output of the boost circuit also reaches a stable state. At this time, the cathode voltage of diode D1 is higher than that of the anode, the diode is cut off, and the boost circuit takes over the power supply of the H bridge.

[0068] The H-bridge circuit is an abstract representation of the aforementioned full-bridge drive circuit. This part of the circuit controls the current direction in coil 2. It also changes the driving force by controlling the conduction time; to a certain extent, the longer the conduction time, the greater the driving force.

[0069] The control system consists of two parts: an MCU for logic operations and processing, and a bus driver. The bus driver translates the signals on the bus into voltage levels that the MCU can accept. The MCU then decodes the signals to obtain the meaning of the instructions and controls the H-bridge accordingly. The current of the H-bridge is fed back to the MCU in real time to ensure the stability of the entire system.

[0070] This application further proposes a medical device, including a device body and a single-coil 2 steam ablation device needle outlet module, wherein the single-coil 2 steam ablation device needle outlet module is connected to the device body.

[0071] The main body of the equipment refers to the core components of the medical device, including the control unit and energy supply. Specifically, it can be implemented using an embedded controller and a rechargeable battery to provide drive current and control signals to the needle delivery module. The single-coil 2 steam ablation device needle delivery module is a puncture execution unit integrating an electromagnetic drive structure. Specifically, it achieves bidirectional displacement control by forming a gradient magnetic field through segmented winding of coil 2, combined with the linkage design of permanent magnet 3 and puncture needle 4. The connection between the two refers to the coupling of the mechanical and electrical interfaces, which can be achieved using a snap-fit ​​fixing structure and conductive contacts to ensure modular assembly / disassembly and reliable signal transmission.

[0072] Specifically, the main body of the device drives coil 2 within the needle delivery module to generate a magnetic field by outputting an adjustable current. The direction of the magnetic field changes with the direction of the current, thereby driving permanent magnet 3 to reciprocate within the movable space 11. Permanent magnet 3 drives puncture needle 4 to move axially. By controlling the duration and intensity of the current pulses, the extension length and retraction position of puncture needle 4 can be precisely adjusted. The modular connection design of the main body of the device and the needle delivery module allows for independent maintenance or replacement of the needle delivery unit while maintaining the compactness of the overall structure. The gradient magnetic field generated by the segmented winding of coil 2 further optimizes the magnetic field distribution, causing permanent magnet 3 to experience a gradual magnetic force during movement, thereby achieving smooth acceleration and rapid braking of puncture needle 4.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. A needle-out module for a single-coil steam ablation device, characterized in that, include: The frame has an active space and a puncture exit communicating with the active space; A coil, the coil being wound around the frame body, the coil comprising a first segment and a second segment connected in series, the first segment and the second segment being spaced apart along the axial direction of the frame body, the first segment being wound in the forward direction and the second segment being wound in the reverse direction; A permanent magnet, which is movably disposed in the active space; A puncture needle is disposed at one end of the permanent magnet facing the puncture outlet. The coil is adapted to be energized to drive the permanent magnet to move the puncture needle, so that the puncture needle extends out of the puncture outlet or retracts into the movable space.

2. The needle outlet module of the single-coil steam ablation device according to claim 1, characterized in that, The outer wall of the frame is provided with a first positioning groove and a second positioning groove, the first section is wound in the first positioning groove, and the second section is wound in the second positioning groove.

3. The needle outlet module of the single-coil steam ablation device according to claim 1, characterized in that, The first segment and the second segment have the same number of turns.

4. The needle outlet module of the single-coil steam ablation device according to claim 1, characterized in that, The lengths of the first segment and the second segment are defined as d, and the length of the permanent magnet is m, which satisfies m≥d>m / 2.

5. The needle outlet module of the single-coil steam ablation device according to claim 1, characterized in that, One end of the frame is provided with a first blocking member, which is located at the puncture outlet and is used to prevent the permanent magnet from extending out of the puncture outlet.

6. The needle outlet module of the single-coil steam ablation device according to claim 5, characterized in that, The frame is provided with a second blocking member at the end away from the puncture outlet, and the second blocking member is located at the end of the coil away from the puncture outlet. The second blocking member is used to stop the permanent magnet from moving away from the puncture needle.

7. The needle outlet module of the single-coil steam ablation device according to claim 1, characterized in that, The permanent magnet is hollow.

8. The needle outlet module of the single-coil steam ablation device according to claim 1, characterized in that, The end of the frame away from the puncture exit is provided with an installation port that connects to the active space.

9. The needle-out module of the single-coil steam ablation device according to any one of claims 1 to 8, characterized in that, The needle-out module of the single-coil steam ablation device further includes a first connecting pole and a second connecting pole. The first connecting pole is connected to one end of the coil, and the second connecting pole is connected to the other end of the coil. The first connecting pole and the second connecting pole are used to connect to the drive circuit.

10. A medical device, characterized in that, The device includes a main body and a single-coil steam ablation device needle outlet module as described in any one of claims 1 to 9, wherein the single-coil steam ablation device needle outlet module is connected to the main body of the device.

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