Water injection control structure for high-frequency electrotome and water injection type high-frequency electrotome

Abstract

The utility model relates to the technical field of medical instruments, and provides a water injection control structure for a high-frequency electrotome and a water injection type high-frequency electrotome. The water injection control structure comprises an inductive switch used for controlling a water pump motor to be powered on, and the control end of the inductive switch is connected with the output end of a signal processing circuit; the input end of the signal processing circuit is connected with the coil, and the coil is wound on the periphery of an electrotome coagulation cutting cable; the signal processing circuit controls the on-off of the inductive switch according to the induced voltage generated by the coil. And mutual exclusion of a high-frequency electrotome coagulation cutting function and a water injection function can be realized.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a water injection control structure for a high-frequency electrosurgical unit and a water injection type high-frequency electrosurgical unit. Background Technology

[0002] A high-frequency electrosurgical unit (HFEMU) is an electrosurgical instrument that replaces mechanical scalpels for tissue cutting. It heats tissue by generating a high-frequency, high-voltage current at the tip of its effective electrode, achieving tissue separation and coagulation, thus achieving cutting and hemostasis. During use, a suitable neutral electrode plate is required. This plate is attached to a muscle-rich area of ​​the patient, guiding the current collected within the body back to the HFEMU and other instruments, forming a complete high-frequency circuit. This disperses the current during high-frequency surgery, reducing the risk of current concentration, safely collecting and delivering the current to the outside of the body, and protecting the patient's safety.

[0003] The procedure for endoscopic mucosal resection involves injecting a medical fluid (such as saline) submucosally to elevate the lesion, thereby separating the mucosal layer from the muscle layer. The lesion is then removed using a high-frequency electrosurgical unit. See Chinese Utility Model Patent CN221786594U, filed August 22, 2024, published October 1, 2024, which describes a water-injection high-frequency electrosurgical unit. This unit has a tubular electrode, with its proximal end connected to a water pump outlet via an inlet tube. Both the inlet tube and the water pump are located within the handle of the electrosurgical unit. The water pump inlet is connected to a liquid storage bag externally placed within the unit. The distal end of the electrode serves as the cutting and coagulation section. This water-injection high-frequency electrosurgical unit can perform both tissue cutting and coagulation, as well as medical fluid injection. This means that only one instrument is needed to perform both medical fluid injection and lesion cutting and coagulation in endoscopic mucosal resection, reducing surgical costs and simplifying the procedure.

[0004] However, to ensure the safe and stable operation of water-injection high-frequency electrosurgical units (HFEMs), the coagulation and water injection functions are mutually exclusive and can only be performed independently. That is, when the HFEM electrode is cutting or coagulating tissue, water cannot be sprayed from the electrode. Therefore, there is an urgent need to provide an improved water-injection HFEM that allows for the mutually exclusive use of the coagulation and water injection functions. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a water injection control structure for high-frequency electrosurgical units and a water injection type high-frequency electrosurgical unit, which can realize the mutually exclusive use of the high-frequency electrosurgical unit's coagulation cutting function and water injection function.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] In a first aspect, this utility model provides a water injection control structure for a high-frequency electrosurgical unit, including an inductive switch for controlling the power supply of a water pump motor. The control terminal of the inductive switch is connected to the output terminal of a signal processing circuit, and the input terminal of the signal processing circuit is connected to a coil. The coil is wound around the outer periphery of the electrosurgical unit's cutting cable. The signal processing circuit controls the opening and closing of the inductive switch according to the induced voltage generated by the coil.

[0010] Optionally, the water injection control structure for the high-frequency electrosurgical unit also includes a user switch for controlling the power supply to the water pump, wherein the user switch is connected in series with the inductive switch.

[0011] Optionally, the signal processing circuit includes a comparator, the inverting input of which is connected to a coil via a rectifier circuit, the non-inverting input of which is connected to a reference circuit for providing a reference voltage, and the output of which is connected to the control terminal of the inductive switch.

[0012] Optionally, the rectifier circuit includes a first resistor, a second resistor, and a rectifier bridge; the first input terminal of the rectifier bridge is connected to the first end of the coil, the second input terminal of the rectifier bridge is connected to the second end of the coil, the first end of the first resistor is connected to the first end of the coil, and the second end of the first resistor is connected to the second end of the coil; the positive terminal of the rectifier bridge is connected to the first end of the second resistor, the negative terminal of the rectifier bridge is connected to the second end of the second resistor, and the inverting input terminal of the comparator is connected to the positive terminal of the rectifier bridge.

[0013] Optionally, the rectifier circuit also includes a Zener diode; the Zener diode and the second resistor are connected in parallel between the positive and negative terminals of the rectifier bridge.

[0014] Optionally, the negative terminal of the rectifier bridge can be grounded.

[0015] Optionally, the reference circuit includes a reference voltage source, which is grounded through a third resistor and a fourth resistor connected in series, and the inverting input of the comparator is connected between the third resistor and the fourth resistor.

[0016] Optionally, the water injection control structure for the high-frequency electrosurgical unit also includes a fifth resistor, the first end of which is connected to a reference voltage source, and the second end of which is connected to the output of a comparator.

[0017] Optionally, the positive power supply terminal of the comparator is connected to a reference voltage source, and the negative power supply terminal of the comparator is grounded.

[0018] Secondly, this utility model provides a water-injection type high-frequency electrosurgical unit, including a water pump, a tubular electrode, and a water injection control structure for high-frequency electrosurgical unit as described above. The proximal end of the electrode is connected to the outlet of the water pump, and the motor of the water pump is connected to the water pump voltage source through an inductive switch.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this utility model are:

[0021] The present invention provides a water injection control structure and a water-injection type high-frequency electrosurgical unit. When the electrosurgical unit is in the coagulation cutting mode, the coagulation cutting cable is energized, and the induced voltage of the coil wound around the coagulation cutting cable has a certain amplitude. When the electrosurgical unit is not in the coagulation cutting mode, the coagulation cutting cable is not energized, and the induced voltage amplitude of the coil wound around the coagulation cutting cable is zero. Then, the signal processing circuit controls the opening and closing of the inductive switch according to the induced voltage generated by the coil, which can realize the mutually exclusive use of the coagulation cutting function and the water injection function of the high-frequency electrosurgical unit. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a water injection control structure for a high-frequency electrosurgical unit according to Embodiment 1;

[0023] Figure 2 This is a schematic diagram of a water injection control structure for a high-frequency electrosurgical unit according to Embodiment 2.

[0024] Explanation of reference numerals in the attached figures

[0025] SW1: Induction switch; SW2: User switch;

[0026] U1: Comparator;

[0027] R1: First resistor; R2: Second resistor; R3: Third resistor; R4: Fourth resistor; R5: Fifth resistor;

[0028] D1: Rectifier bridge;

[0029] ZD1: Zener diode;

[0030] L: coil;

[0031] I: Condensed cable;

[0032] M: Water pump motor;

[0033] Vcc1: Reference voltage source;

[0034] Vcc2: Water pump voltage source. Detailed Implementation

[0035] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, "near" refers to the side closer to the operator, and "far" refers to the side closer to the patient.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a water injection control structure for a high-frequency electrosurgical unit, including an inductive switch SW1 for controlling the energization of a water pump motor M. The control terminal of the inductive switch SW1 is connected to the output terminal of a signal processing circuit, and the input terminal of the signal processing circuit is connected to a coil L. The coil L is wound around the outer periphery of the electrosurgical cutting cable I. The signal processing circuit controls the opening and closing of the inductive switch SW1 according to the induced voltage generated by the coil L.

[0038] The coagulation cable I is used to supply power to the electrodes of the high-frequency electrosurgical unit. With this water injection control structure, when the electrosurgical unit is in coagulation mode, the coagulation cable I is energized, and the induced voltage in coil L has a certain amplitude. When the electrosurgical unit is not in coagulation mode, the coagulation cable I is not energized, and the induced voltage amplitude in coil L is zero. The signal processing circuit then controls the opening and closing of the inductive switch SW1 based on the induced voltage generated by coil L, enabling the mutually exclusive use of the high-frequency electrosurgical unit's coagulation and water injection functions.

[0039] Preferably, the signal processing circuit includes a comparator U1. The inverting input of comparator U1 is connected to coil L via a rectifier circuit, the non-inverting input of comparator U1 is connected to a reference circuit for providing a reference voltage, and the output of comparator U1 is connected to the control terminal of inductive switch SW1. Thus, the inverting input of comparator U1 receives an induced voltage, and the non-inverting input receives a reference voltage. When the electrosurgical unit is in coagulation cutting mode, the induced voltage in coil L has a certain amplitude, and comparator U1 outputs a low level. When the electrosurgical unit is not in coagulation cutting mode, the amplitude of the induced voltage in coil L is zero, and comparator U1 outputs a high level. The output of comparator U1 is connected to the control terminal of inductive switch SW1, allowing control of the inductive switch SW1's opening and closing based on the output level of comparator U1. Specifically, when comparator U1 outputs a low level, inductive switch SW1 is open, and the water pump stops working; when comparator U1 outputs a high level, inductive switch SW1 is closed, and the water pump operates. This simple structure enables the mutually exclusive use of the high-frequency electrosurgical unit's coagulation cutting and water injection functions.

[0040] Preferably, the rectifier circuit includes a first resistor R1, a second resistor R2, and a rectifier bridge D1. The first input terminal of the rectifier bridge D1 is connected to the first end of the coil L, and the second input terminal of the rectifier bridge D1 is connected to the second end of the coil L. The first end of the first resistor R1 is connected to the first end of the coil L, and the second end of the first resistor R1 is connected to the second end of the coil L. The positive terminal of the rectifier bridge D1 is connected to the first end of the second resistor R2, and the negative terminal of the rectifier bridge D1 is connected to the second end of the second resistor R2. The inverting input terminal of the comparator U1 is connected to the positive terminal of the rectifier bridge D1. Thus, by connecting the rectifier bridge D1 in parallel with the resistors, a filtering function is achieved, making the DC voltage output by the rectifier bridge D1 more stable and smooth.

[0041] More preferably, the rectifier circuit further includes a Zener diode ZD1; the Zener diode ZD1 and the second resistor R2 are connected in parallel between the positive and negative terminals of the rectifier bridge D1. This ensures that the amplitude of the DC voltage output by the rectifier bridge D1 is within a safe and reasonable range.

[0042] Furthermore, the negative terminal of rectifier bridge D1 is grounded.

[0043] Preferably, the reference circuit includes a reference voltage source Vcc1, which is grounded through a third resistor R3 and a fourth resistor R4 connected in series. The inverting input of the comparator U1 is connected between the third resistor R3 and the fourth resistor R4. Thus, the reference voltage is obtained by voltage division through the third resistor R3 and the fourth resistor R4.

[0044] Preferably, the water injection control structure further includes a fifth resistor R5. The first end of the fifth resistor R5 is connected to the reference voltage source Vcc1, and the second end of the fifth resistor R5 is connected to the output terminal of comparator U1. In this way, the fifth resistor R5 provides a pull-up effect and current limiting protection for the output of comparator U1, which is beneficial to the output accuracy and stability of comparator U1.

[0045] Furthermore, the positive power supply terminal of comparator U1 is connected to the reference voltage source Vcc1, and the negative power supply terminal of comparator U1 is grounded. In this way, power is supplied to comparator U1.

[0046] Example 2

[0047] like Figure 2 As shown, this embodiment provides a water injection control structure for a high-frequency electrosurgical unit. The main difference from Embodiment 1 is that it also includes a user switch SW2 for controlling the power supply of the water pump. The user switch SW2 is connected in series with the induction switch SW1. The user switch SW2 is a switch that is controlled to open and close by the user pressing or contacting it.

[0048] Thus, when the electrosurgical unit is in the coagulation cutting mode, the coagulation cutting cable I is energized, and the induced voltage of the coil L has a certain amplitude. The signal processing circuit controls the inductive switch SW1 to open based on the induced voltage generated by the coil L. Even if the user controls the user switch SW2 to close, the electrosurgical unit cannot perform water injection, further ensuring the safety of the high-frequency electrosurgical unit. When the electrosurgical unit is not in the coagulation cutting mode, the coagulation cutting cable I is not energized, and the induced voltage amplitude of the coil L is zero. The signal processing circuit controls the inductive switch SW1 to close based on the induced voltage generated by the coil L. At this time, the electrosurgical unit still cannot perform water injection. Only when the user controls the user switch SW2 to close can the electrosurgical unit perform water injection.

[0049] The remaining contents are the same as in Example 1, and will not be repeated here.

[0050] Example 3

[0051] This embodiment provides a water-injection type high-frequency electrosurgical unit, which includes a water pump, a tubular electrode, and a water injection control structure for the high-frequency electrosurgical unit as described in Embodiment 1 or Embodiment 2. The distal end of the electrode is used as a coagulation cutting section, and the proximal end of the electrode is connected to the outlet of the water pump. The motor of the water pump is connected to the water pump voltage source Vcc2 through an inductive switch SW1.

[0052] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0054] In this 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 indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "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.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A water injection control structure for a high frequency electrosurgical knife, characterized by, It includes an inductive switch (SW1) for controlling the power supply of a water pump motor (M). The control terminal of the inductive switch (SW1) is connected to the output terminal of a signal processing circuit, and the input terminal of the signal processing circuit is connected to a coil (L). The coil (L) is wound around the outer periphery of an electric cutting cable (I). The signal processing circuit controls the opening and closing of the inductive switch (SW1) according to the induced voltage generated by the coil (L).

2. The water injection control structure for a high-frequency electrotome according to claim 1, wherein It also includes a user switch (SW2) for controlling the power supply to the water pump, which is connected in series with the inductive switch (SW1).

3. The water injection control structure for a high-frequency electrotome according to claim 1, wherein The signal processing circuit includes a comparator (U1), the inverting input of which is connected to the coil (L) through a rectifier circuit, the non-inverting input of which is connected to a reference circuit for providing a reference voltage, and the output of which is connected to the control terminal of the inductive switch (SW1).

4. The water injection control structure for a high-frequency electrotome according to claim 3, characterized by The rectifier circuit includes a first resistor (R1), a second resistor (R2), and a rectifier bridge (D1); The first input terminal of the rectifier bridge (D1) is connected to the first terminal of the coil (L), the second input terminal of the rectifier bridge (D1) is connected to the second terminal of the coil (L), the first terminal of the first resistor (R1) is connected to the first terminal of the coil (L), and the second terminal of the first resistor (R1) is connected to the second terminal of the coil (L). The positive terminal of the rectifier bridge (D1) is connected to the first terminal of the second resistor (R2), the negative terminal of the rectifier bridge (D1) is connected to the second terminal of the second resistor (R2), and the inverting input terminal of the comparator (U1) is connected to the positive terminal of the rectifier bridge (D1).

5. The water injection control structure for a high-frequency electrotome according to claim 4, characterized by The rectifier circuit also includes a Zener diode (ZD1); the Zener diode (ZD1) and the second resistor (R2) are connected in parallel between the positive and negative terminals of the rectifier bridge (D1).

6. The water injection control structure for a high-frequency electrotome according to claim 4 or 5, characterized by The negative terminal of the rectifier bridge (D1) is grounded.

7. The water injection control structure for a high-frequency electrotome according to claim 3, characterized by The reference circuit includes a reference voltage source (Vcc1), which is grounded through a third resistor (R3) and a fourth resistor (R4) connected in series. The inverting input of the comparator (U1) is connected between the third resistor (R3) and the fourth resistor (R4).

8. The water injection control structure for a high-frequency electrotome according to claim 7, characterized by It also includes a fifth resistor (R5), the first end of which is connected to the reference voltage source (Vcc1), and the second end of which is connected to the output of the comparator (U1).

9. The water injection control structure for a high-frequency electrotome according to claim 7, characterized by The positive power supply terminal of comparator (U1) is connected to the reference voltage source (Vcc1), and the negative power supply terminal of comparator (U1) is grounded.

10. A water-jet high-frequency electrotome characterized by comprising: The device includes a water pump, a tubular electrode, and a water injection control structure for a high-frequency electrosurgical unit as described in any one of claims 1 to 9. The proximal end of the electrode is connected to the outlet of the water pump, and the motor of the water pump is connected to the water pump voltage source (Vcc2) via an inductive switch (SW1).

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