Control system for venous intraluminal radio-frequency closure catheter

Abstract

Disclosed is a control system for a venous intraluminal radio-frequency closure catheter, relating to the technical field of medical instruments. The system comprises a main control unit, a communication module electrically connected to the main control unit, an impedance control module, a display screen, a button module, and an auxiliary power supply, wherein the button module is configured to acquire a key signal on a handle; the main control unit is configured to output, by means of the communication module, an impedance control signal to the impedance control module according to the key signal; the display screen is configured to display working states of multi-segment catheter coils; the auxiliary power supply is configured to supply power to the impedance control circuit, the communication module, the display screen, and the button module. The impedance control module controls the switching of the working impedance of the multi-segment catheter coils according to the control signal, thereby achieving the control of a venous intraluminal radio-frequency closure catheter. The control system for venous intraluminal radio-frequency closure catheter can achieve accurate switching control and a combination of the multi-segment catheter coils, meet clinical diversity requirements and diversification of operator techniques, and improve the effect of venous vessel closure.

Description

An intravenous radiofrequency closure catheter control system Technical Field

[0001] This manual relates to the field of medical device technology, and in particular to a control system for an intravenous radiofrequency closure catheter. Background Technology

[0002] The main treatments for varicose veins include laser therapy, radiofrequency ablation, microwave ablation, and electrocoagulation. Compared to earlier stripping methods, these procedures are less invasive, have fewer complications, and result in faster recovery. Additionally, there are currently procedures that treat varicose veins by injecting sclerosing agents into the target blood vessels. Among mainstream treatments, radiofrequency ablation is increasingly accepted by hospitals and patients for its safety and reliability. The principle of radiofrequency ablation is to use controlled radiofrequency energy to heat a heating element on a catheter, and then regulate the temperature through thermocouple feedback. Ultimately, the heat energy is applied to the treatment site, thus treating the varicose veins.

[0003] In radiofrequency ablation treatments, the treatment segment of the catheter is typically a hollow metal tube or a heating coil. For example, the existing technology CN221285889U provides an intravenous radiofrequency closure catheter, in which the entire coil heats up simultaneously when the treatment segment is working. However, with the increase in varicose vein patients, the diverse needs of clinical surgery have emerged. For instance, the excessive curvature of the patient's veins may prevent the catheter from completely adhering to the vessel, requiring local ablation. Also, the length of the vein may not be an integer multiple of the catheter coil length, resulting in some parts requiring repeated ablation. These new needs mean that only a small segment of the coil can be used for ablation, and the entire working segment cannot be used for ablation, otherwise, excessive ablation will damage the normal tissue surrounding the blood vessel. Summary of the Invention

[0004] To address the aforementioned shortcomings in the prior art, the present invention provides an intravenous radiofrequency closure catheter control system that solves the problem of inaccurate segmented control of intravenous radiofrequency closure catheters.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is: an intravenous radiofrequency closure catheter control system, comprising:

[0006] The system includes a main control unit, a communication module, an impedance control module, a display screen, a button module, and an auxiliary power supply, all electrically connected to the main control unit. The button module receives button signals from the handle. The main control unit outputs an impedance control signal to the impedance control module via the communication module based on the button signals. The display screen shows the operating status of the multi-segment catheter coil. The auxiliary power supply powers the impedance control circuit, the communication module, the display screen, and the button module. The impedance control module controls the switching of the multi-segment catheter coil's operating impedance based on the control signal, thereby controlling the intravenous radiofrequency closure catheter.

[0007] Furthermore, the impedance control module includes an impedance control circuit and a relay unit. The impedance control circuit is used to receive control signals from the main control unit and transmit them to the relay unit. The relay unit is used to switch the working impedance of the conduit coil based on the control signals.

[0008] Furthermore, the multi-segment conduit coil includes at least three coil impedances R1, R2, and R3, and the relay unit includes at least two relays RL1 and RL2.

[0009] Furthermore, the impedance control circuit includes: chip U5, resistors R14, R15, and R16, grounding capacitors C7, C8, and C9, relays RL1 and RL2; wherein, the first pin of chip U5 is connected to one end of resistor R14 and grounding capacitor C7, the second pin of chip U5 is connected to one end of resistor R15 and grounding capacitor C8, the fourth pin of chip U5 is connected to the main control unit, the ninth pin of chip U5 is grounded, the tenth pin of chip U5 is connected to one end of grounding capacitor C9 and resistor R16, the seventeenth pin of chip U5 is connected to relay RL2, the eighteenth pin of chip U5 is connected to relay RL1, the other ends of resistors R14 and R15 are both connected to the communication module, and the other end of resistor R16 is connected to the auxiliary power supply.

[0010] Furthermore, the relays RL1 and RL2 include: a coil of relay RL1, a normally open contact of relay RL1, a normally closed contact of relay RL1, a coil of relay RL2, a normally open contact of relay RL2, and a normally closed contact of relay RL2; wherein, the coil of relay RL1 is connected to the eighteenth pin of chip U5, the coil of relay RL2 is connected to the seventeenth pin of chip U5, one end of the coil impedance R1 is connected to the normally open contact of relay RL2, one end of the coil impedance R2 is connected to the normally open contact of relay RL1, one end of the coil impedance R3 is connected to the normally closed contact of relay RL1, and the other ends of the coil impedance R1, the other ends of the coil impedance R2, and the other ends of the coil impedance R3 are all connected to the common terminal RF1.

[0011] Furthermore, the communication module includes: chip U4, resistors R9, R10, R11, grounding resistor R12, R13, and grounding capacitor C3; wherein, the sixth pin of chip U4 is connected to one end of resistor R9 and the other end of resistor R14, the seventh pin of chip U4 is connected to the other end of resistor R9 and the other end of resistor R15, the first pin of chip U4 is connected to one end of resistor R10, the second and third pins of chip U4 are both connected to one end of resistor R11 and grounding resistor R12, the fourth pin of chip U4 is connected to one end of resistor R13, the fifth pin of chip U4 is grounded, the eighth pin of chip U4 is connected to the auxiliary power supply and grounding capacitor C3, the other end of resistor R10 is connected to the UART transmit port of the main control unit, the other end of resistor R11 is connected to the UART debug port of the main control unit, and the other end of resistor R13 is connected to the UART receive port of the main control unit.

[0012] Furthermore, the auxiliary power supply includes: chip U3, grounding capacitor C4, and grounding capacitor C5; wherein, the first pin of chip U3 is a +5V power supply terminal, and is connected to grounding capacitor C4 and the eighth pin of chip U4 respectively; the second and third pins of chip U3 are grounded; the fourth pin of chip U3 is connected to grounding capacitor C5; and the fifth pin of chip U3 is a 3V3 power supply terminal, and is connected to the other end of resistor R16, the display screen, and the button module respectively.

[0013] Furthermore, the display screen includes: chip U2, resistor R1, and grounding resistor R5; wherein, the second pin of chip U2 is connected to one end of resistor R1, the sixth pin of chip U2 and the other end of resistor R1 are both connected to the fifth pin of chip U3, the first and seventh pins of chip U2 are grounded, the third pin of chip U2 is connected to grounding resistor R5, the fourth pin of chip U2 is connected to the data port of the main control unit, and the fifth pin of chip U2 is connected to the clock port of the main control unit.

[0014] Furthermore, the button module includes: switch K1, grounding capacitor C6 and resistor R8; wherein, one end of resistor R8 is connected to the fifth pin of chip U3, the other end of resistor R8 is connected to one end of switch K1, grounding capacitor C6 is connected to the switch detection port of the main control unit, and the other end of switch K1 is grounded.

[0015] The beneficial effects of this invention are as follows: An intravenous radiofrequency closure catheter control system can realize accurate switching and combination control of multi-segment catheter coils, better ablate local and tortuous veins, prevent repeated and excessive heating that could burn surrounding normal tissues, meet diverse clinical needs and operator techniques, improve the effect of venous closure, and only require improvements to the handle catheter end without modifying the host hardware structure. It can be directly adapted to the original host and provides convenient and user-friendly interactive methods such as buttons and OLED displays. The circuit structure is simple, efficient, safe and reliable. Attached Figure Description

[0016] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0017] Figure 1 is a schematic diagram of a module of an intravenous radiofrequency closure catheter control system according to some embodiments of this specification;

[0018] Figure 2 is an exemplary schematic diagram of the three-section conduit coil impedance according to some embodiments of this specification;

[0019] Figure 3 is an exemplary schematic diagram of a three-section conduit coil impedance connection according to some embodiments of this specification;

[0020] Figure 4 is an exemplary schematic diagram of coil impedance selection access logic according to some embodiments of this specification;

[0021] Figure 5 is an exemplary schematic diagram of a coil impedance control circuit according to some embodiments of this specification;

[0022] Figure 6 is an exemplary schematic diagram of a communication module circuit according to some embodiments of this specification;

[0023] Figure 7 is an exemplary schematic diagram of an OLED display circuit according to some embodiments of this specification;

[0024] Figure 8 is an exemplary schematic diagram of an auxiliary power supply circuit according to some embodiments of this specification;

[0025] Figure 9 is an exemplary schematic diagram of a button circuit according to some embodiments of this specification. Detailed Implementation

[0026] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0027] Example

[0028] Figure 1 is a schematic diagram of a module of an intravenous radiofrequency closure catheter control system according to some embodiments of this specification.

[0029] As shown in Figure 1, in some embodiments, an endovenous radiofrequency closure catheter control system may include a main control unit, a communication module, an impedance control module, a display screen, a button module, and an auxiliary power supply electrically connected to the main control unit. The button module is used to acquire button signals from the handle. The main control unit is used to output impedance control signals to the impedance control module via the communication module based on the button signals. The display screen is used to display the operating status of the multi-segment catheter coil. The auxiliary power supply is used to power the impedance control circuit, the communication module, the display screen, and the button module. The impedance control module controls the switching of the operating impedance of the multi-segment catheter coil according to the control signals, thereby controlling the endovenous radiofrequency closure catheter.

[0030] In some embodiments, an intravenous radiofrequency closure catheter control system can be applied to the handle end.

[0031] The aforementioned multi-segment catheter coil includes at least three coil segments. Each coil segment (sub-coil) forms an independent impedance and can be combined. Each impedance is connected in parallel to the radio frequency energy transmission circuit, and current flows through it to generate heat. In this embodiment, the catheter treatment segment coil is divided into three independent sub-coils, and the corresponding impedances are represented by R1, R2, and R3, respectively, as shown in Figure 2. The actual length of each sub-coil segment can be set according to requirements. For example, a coil with a total length of 7 cm can be divided into three sub-coil impedances such as 1 cm, 2 cm, and 4 cm or 3 cm, 3 cm, and 1 cm. Then, the button module is used to select the sub-coil and the main control unit sends a control signal to the impedance control module. The impedance control module selects (or switches) at least one segment to be connected to the radio frequency circuit to form the working impedance according to the control signal. The connection relationship and combination logic are shown in Figures 3 and 4.

[0032] Specifically, the impedance control module includes an impedance control circuit and a relay unit. The impedance control circuit receives and processes the control signal from the main control unit and sends it to the relay unit. The relay unit performs corresponding actions according to the control signal, namely, connecting and / or switching the working impedance of the conduit sub-coil. The relay unit can use at least two relays RL1 and RL2 connected in parallel to the radio frequency circuit.

[0033] In some embodiments, as shown in FIG5, the impedance control circuit includes: chip U5, resistors R14, R15, and R16, grounding capacitors C7, C8, and C9, relays RL1 and RL2; wherein, the first pin of chip U5 is connected to one end of resistor R14 and grounding capacitor C7, the second pin of chip U5 is connected to one end of resistor R15 and grounding capacitor C8, the fourth pin of chip U5 is connected to the main control unit, the ninth pin of chip U5 is grounded, the tenth pin of chip U5 is connected to one end of grounding capacitor C9 and resistor R16, the seventeenth pin of chip U5 is connected to relay RL2, the eighteenth pin of chip U5 is connected to relay RL1, the other ends of resistors R14 and R15 are both connected to the communication module, and the other end of resistor R16 is connected to the auxiliary power supply.

[0034] Furthermore, the relays RL1 and RL2 include: a coil of relay RL1, a normally open contact of relay RL1, a normally closed contact of relay RL1, a coil of relay RL2, a normally open contact of relay RL2, and a normally closed contact of relay RL2; wherein, the coil of relay RL1 is connected to the eighteenth pin of chip U5, the coil of relay RL2 is connected to the seventeenth pin of chip U5, one end RF-2A of the coil impedance R1 is connected to the normally open contact of relay RL2, one end RF-2B of the coil impedance R2 is connected to the normally open contact of relay RL1, one end RF-2C of the coil impedance R3 is connected to the normally closed contact of relay RL1, and the other ends of the coil impedance R1, the other ends of the coil impedance R2, and the other ends of the coil impedance R3 are all connected to the common terminal RF1.

[0035] In some embodiments, the communication module includes: chip U4, resistors R9, R10, R11, grounding resistor R12, R13, and grounding capacitor C3; wherein, the sixth pin of chip U4 is connected to one end of resistor R9 and the other end of resistor R14, the seventh pin of chip U4 is connected to the other end of resistor R9 and the other end of resistor R15, the first pin of chip U4 is connected to one end of resistor R10, the second and third pins of chip U4 are both connected to one end of resistor R11 and grounding resistor R12, the fourth pin of chip U4 is connected to one end of resistor R13, the fifth pin of chip U4 is grounded, the eighth pin of chip U4 is connected to the auxiliary power supply and grounding capacitor C3, the other end of resistor R10 is connected to the UART transmit port of the main control unit, the other end of resistor R11 is connected to the UART debug port of the main control unit, and the other end of resistor R13 is connected to the UART receive port of the main control unit.

[0036] As shown in Figure 8, the auxiliary power supply includes: chip U3, grounding capacitor C4, and grounding capacitor C5; wherein, the first pin of chip U3 is a +5V power supply terminal, and is connected to grounding capacitor C4 and the eighth pin of chip U4 respectively; the second and third pins of chip U3 are grounded; the fourth pin of chip U3 is connected to grounding capacitor C5; and the fifth pin of chip U3 is a 3V3 power supply terminal, and is connected to the other end of resistor R16, the display screen, and the button module respectively.

[0037] As shown in Figure 7, the display circuit includes: chip U2, resistor R1 and grounding resistor R5; wherein, the second pin of chip U2 is connected to one end of resistor R1, the sixth pin of chip U2 and the other end of resistor R1 are both connected to the fifth pin of chip U3, the first and seventh pins of chip U2 are grounded, the third pin of chip U2 is connected to grounding resistor R5, the fourth pin of chip U2 is connected to the data port of the main control unit, and the fifth pin of chip U2 is connected to the clock port of the main control unit.

[0038] As shown in Figure 9, the button module includes: switch K1, grounding capacitor C6 and resistor R8; wherein, one end of resistor R8 is connected to the fifth pin of chip U3, the other end of resistor R8 is connected to one end of switch K1, grounding capacitor C6 is connected to the switch detection port of the main control unit, and the other end of switch K1 is grounded.

[0039] The circuit connections are as follows: One end of the R1 segment coil impedance is connected to the normally open contact of relay RL2 through the RF-2A port; one end of the R2 and R3 segment coil impedances are connected to the normally open and normally closed contacts of relay RL1 through the RF-2B and RF-2C ports, respectively; the other ends of the R1, R2, and R3 segment coil impedances are connected to the common port of RF1; relays RL1 and RL2 are connected to the impedance control circuit through the RxBC and RxAC ports, respectively; and the impedance control circuit is connected to the A and B terminals of the communication module through the EN_2AC and EN_2BC interfaces. The communication module and the main control unit transmit control signals through the UART interface. RF2 is a fixed port of the relay. RF2 and RF1 are connected to the two poles of the host RF generator module through wires to form an RF energy transmission loop, as shown in Figures 2, 3, 4, 5 and 6. The figure is only shown as an example to show that RF-2C is used as a normally closed port so that R3 does not need to be selected by the button. The RF-2A and RF-2B ports are normally open, so that R1 and R2 can be selected by the button. If it is necessary to set the button to select R3, another relay can be added and connected to RF-2C.

[0040] In some embodiments, the main control unit may be a microcontroller such as the GD32F330 chip, which is electrically connected to the communication module, display screen, button module and impedance control module in this embodiment through its corresponding pin ports.

[0041] In some embodiments, as shown in Table 1, the main control unit may include a UART transmit port, a UART debug port, a UART receive port, a data port, a clock port, and a switch detection port; wherein, the UART transmit port is connected to the other end of resistor R10, the UART debug port is connected to the other end of resistor R11, the UART receive port is connected to the other end of resistor R13, the data port is connected to the fourth pin of chip U2, the clock port is connected to the fifth pin of chip U2, and the switch detection port is connected to the other end of resistor R8, one end of switch K1, and grounding capacitor C6.

[0042] Table 1. Connection Relationship of Main Control Unit

[0043] The entire system works as follows: By connecting the catheter to the main unit, the catheter tip is inserted into the lower limb vein under ultrasound guidance. Medical personnel determine the catheter sub-coil to use based on the location, length, and curvature of the vein to be closed. They can select only one segment or multiple segments simultaneously. For example, if the vein to be closed is 4 cm long, only the R3=4 cm segment coil can be selected, or two segments, R3=1 cm and R2=3 cm, can be selected. Similarly, if the vein to be closed is 7 cm long, R3, R2, and R1 segments can be selected simultaneously. If the vein to be closed is 8 cm long, the R3=4 cm segment coil can be used for two consecutive ablation cycles.

[0044] Then, press the corresponding button on the handle according to the selected sub-coil (corresponding buttons can be set on the handle for each sub-coil, and the button circuits of each button can be connected in parallel). The main control unit detects the button signal and analyzes the sub-coil information to be connected or switched. Then, it sends the control signal corresponding to the sub-coil information to the impedance control module through the UART interface of the communication module.

[0045] The impedance control module controls the relay to connect / disconnect the corresponding sub-coil to the radio frequency energy transmission circuit according to the control signal. It also sends the working status of each sub-coil impedance to the main control unit and displays it on the OLED screen. Then, the treatment program is started on the host connected to the catheter cable to perform ablation treatment. It can accurately switch and control the sub-coil according to actual needs and combine them into working coils of different lengths. For example, it can perform local ablation at the excessively tortuous part of the vein, or when a small part is left after using the whole coil for ablation and the whole coil cannot be used, one or more sub-coil segments can be selected and attached to the tortuous or remaining part for local heating. This can better ablate the veins in the local or tortuous parts, prevent repeated or excessive heating in the local or tortuous parts and burn the surrounding normal tissue, and improve the closure effect of the veins.

[0046] In some embodiments of this specification, an intravenous radiofrequency closure catheter control system is provided, which can realize accurate switching control and combination of multi-segment catheter coils, meet the diverse clinical needs and operator techniques, improve the effect of venous closure, and only requires modification at the catheter end without modifying the host hardware structure. It can be directly adapted to the original host and provides convenient and user-friendly interaction methods such as buttons and OLED displays. The circuit structure is simple, efficient, safe and reliable.

Claims

1. A control system for an endovenous radiofrequency closure catheter, characterized in that, include: The system includes a main control unit, a communication module, an impedance control module, a display screen, a button module, and an auxiliary power supply, all electrically connected to the main control unit. The button module receives button signals from the handle. The main control unit outputs an impedance control signal to the impedance control module via the communication module based on the button signals. The display screen shows the operating status of the multi-segment catheter coil. The auxiliary power supply powers the impedance control circuit, the communication module, the display screen, and the button module. The impedance control module controls the switching of the multi-segment catheter coil's operating impedance based on the control signal, thereby controlling the intravenous radiofrequency closure catheter.

2. The intravenous radiofrequency closure catheter control system according to claim 1, characterized in that, The impedance control module includes an impedance control circuit and a relay unit. The impedance control circuit is used to receive control signals from the main control unit and transmit them to the relay unit. The relay unit is used to switch the working impedance of the conduit coil based on the control signals.

3. The intravenous radiofrequency closure catheter control system according to claim 2, characterized in that, The multi-segment conduit coil includes at least three coil impedances R1, R2 and R3, and the relay unit includes at least two relays RL1 and RL2.

4. The intravenous radiofrequency closure catheter control system according to claim 3, characterized in that, The impedance control circuit includes: chip U5, resistors R14, R15, and R16, grounding capacitors C7, C8, and C9, relays RL1 and RL2; wherein, the first pin of chip U5 is connected to one end of resistor R14 and grounding capacitor C7, the second pin of chip U5 is connected to one end of resistor R15 and grounding capacitor C8, the fourth pin of chip U5 is connected to the main control unit, the ninth pin of chip U5 is grounded, the tenth pin of chip U5 is connected to one end of grounding capacitor C9 and resistor R16, the seventeenth pin of chip U5 is connected to relay RL2, the eighteenth pin of chip U5 is connected to relay RL1, the other ends of resistors R14 and R15 are both connected to the communication module, and the other end of resistor R16 is connected to the auxiliary power supply.

5. The intravenous radiofrequency closure catheter control system according to claim 4, characterized in that, The relays RL1 and RL2 each include: a coil of relay RL1, a normally open contact of relay RL1, a normally closed contact of relay RL1, a coil of relay RL2, a normally open contact of relay RL2, and a normally closed contact of relay RL2; wherein, the coil of relay RL1 is connected to the eighteenth pin of chip U5, the coil of relay RL2 is connected to the seventeenth pin of chip U5, one end of the coil impedance R1 is connected to the normally open contact of relay RL2, one end of the coil impedance R2 is connected to the normally open contact of relay RL1, one end of the coil impedance R3 is connected to the normally closed contact of relay RL1, and the other ends of the coil impedance R1, the other ends of the coil impedance R2, and the other ends of the coil impedance R3 are all connected to the common terminal RF1.

6. The intravenous radiofrequency closure catheter control system according to claim 5, characterized in that, The communication module includes: chip U4, resistors R9, R10, R11, grounding resistor R12, R13, and grounding capacitor C3; wherein, the sixth pin of chip U4 is connected to one end of resistor R9 and the other end of resistor R14, the seventh pin of chip U4 is connected to the other end of resistor R9 and the other end of resistor R15, the first pin of chip U4 is connected to one end of resistor R10, the second and third pins of chip U4 are both connected to one end of resistor R11 and grounding resistor R12, the fourth pin of chip U4 is connected to one end of resistor R13, the fifth pin of chip U4 is grounded, the eighth pin of chip U4 is connected to the auxiliary power supply and grounding capacitor C3, the other end of resistor R10 is connected to the UART transmit port of the main control unit, the other end of resistor R11 is connected to the UART debug port of the main control unit, and the other end of resistor R13 is connected to the UART receive port of the main control unit.

7. The intravenous radiofrequency closure catheter control system according to claim 6, characterized in that, The auxiliary power supply includes: chip U3, grounding capacitor C4, and grounding capacitor C5; wherein, the first pin of chip U3 is a +5V power supply terminal, and is connected to grounding capacitor C4 and the eighth pin of chip U4 respectively; the second and third pins of chip U3 are grounded; the fourth pin of chip U3 is connected to grounding capacitor C5; and the fifth pin of chip U3 is a 3V3 power supply terminal, and is connected to the other end of resistor R16, the display screen, and the button module respectively.

8. The intravenous radiofrequency closure catheter control system according to claim 7, characterized in that, The display screen includes: chip U2, resistor R1 and grounding resistor R5; wherein, the second pin of chip U2 is connected to one end of resistor R1, the sixth pin of chip U2 and the other end of resistor R1 are both connected to the fifth pin of chip U3, the first and seventh pins of chip U2 are grounded, the third pin of chip U2 is connected to grounding resistor R5, the fourth pin of chip U2 is connected to the data port of the main control unit, and the fifth pin of chip U2 is connected to the clock port of the main control unit.

9. The intravenous radiofrequency closure catheter control system according to claim 8, characterized in that, The button module includes: switch K1, grounding capacitor C6 and resistor R8; wherein, one end of resistor R8 is connected to the fifth pin of chip U3, the other end of resistor R8 is connected to one end of switch K1, grounding capacitor C6 is connected to the switch detection port of the main control unit, and the other end of switch K1 is grounded.

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