Key circuit for medical electronic endoscope and medical electronic endoscope

Abstract

The utility model relates to a key circuit for a medical electronic endoscope and the medical electronic endoscope, and belongs to the technical field of medical devices. A transmitting end circuit of the key circuit is formed by a voltage division series resistance branch and a key branch, and a receiving end circuit of the key circuit is formed by a voltage comparison branch, so that the transmitting end circuit generates voltages with different amplitudes according to different key conduction combinations and transmits the voltages to the receiving end circuit through a single wire; and the receiving end circuit carries out key signal restoration on the received voltages with different amplitudes. By adopting a single wire for transmission, the wire cost can be reduced, the wire diameter is reduced, signal transmission is facilitated, the production process is simplified, meanwhile, under the condition that multi-key signal restoration is met, interference on high-speed signals of endoscope images is reduced, and the image quality and transmission stability of original signals of the medical electronic endoscope are improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a button circuit for a medical electronic endoscope and a medical electronic endoscope. Background Technology

[0002] To facilitate image information storage and medical operations, most existing medical electronic endoscopes are equipped with operation buttons. After medical personnel press different buttons, the operation instructions are transmitted to the back end via the transmission line corresponding to each button, enabling operations such as drug administration, image scaling, and issuing commands to other medical devices.

[0003] In other words, existing medical electronic endoscopes with buttons employ a multi-line control structure that transmits different button control information through different lines (or signal transmission ports). This results in numerous signal lines, and the electrical information transmitted across these lines is similar, differing only in the transmission route or port. This structure, with its numerous lines and similar electrical information, makes crosstalk between different transmission lines prone to occur, and the overall transmission line is more susceptible to external interference, ultimately reducing the reliability of the medical electronic endoscope.

[0004] Therefore, how to provide a more stable and reliable button-operated medical electronic endoscope is an urgent problem to be solved. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a button circuit for a medical electronic endoscope and a medical electronic endoscope, thereby solving the technical problem of insufficient reliability of existing button-type medical electronic endoscopes.

[0006] In a first aspect, this utility model provides a button circuit for a medical electronic endoscope, comprising: a voltage divider series resistor branch, a button branch, a single wire, and a voltage comparison branch.

[0007] The power supply terminal of the voltage divider series resistor branch is connected to the positive terminal of the power supply. The output terminal of the voltage divider series resistor branch is connected to the input terminal of the voltage comparison branch through the single wire. The input terminal of the voltage divider series resistor branch is connected to the output terminal of the button branch. The input terminal of the button branch is grounded.

[0008] Optionally, the button branch includes N buttons and N output terminals, and the nth output terminal of the button branch is connected to the input terminal of the button branch through the nth button. .

[0009] Optionally, the voltage divider series resistor branch includes N voltage divider resistors and N input terminals. All the voltage divider resistors are connected in series, and any two adjacent voltage divider resistors form a series node. The non-series node of the first voltage divider resistor is connected to the power supply terminal of the voltage divider series resistor branch. The N-1 series nodes and the non-series node of the Nth voltage divider resistor are respectively connected to different input terminals of the voltage divider series resistor branch. The first series node is connected to the output terminal of the voltage divider series resistor branch.

[0010] Optionally, to improve the stability and safety of the regulated voltage output of the voltage divider series resistor branch, the voltage divider series resistor branch further includes a ground terminal and an (N+1)th voltage divider resistor. The non-series node of the Nth voltage divider resistor is connected to the ground terminal of the voltage divider series resistor branch through the (N+1)th voltage divider resistor, and the ground terminal of the voltage divider series resistor branch is grounded.

[0011] Optionally, the voltage comparison branch includes N comparators, N reference voltage generation sub-branches, and N output terminals. The reference voltage output terminal of the nth reference voltage generation sub-branch is connected to the inverting input terminal of the nth comparator, the output terminal of the nth comparator is connected to the nth output terminal of the voltage comparison branch, and the non-inverting input terminals of all the comparators are connected to the input terminals of the voltage comparison branch.

[0012] Optionally, to improve integration, the voltage comparison branch includes N comparators, a reference voltage generation sub-branch, and N output terminals. The reference voltage generation sub-branch includes N reference voltage output terminals. The nth reference voltage output terminal is connected to the inverting input terminal of the nth comparator, the output terminal of the nth comparator is connected to the nth output terminal of the voltage comparison branch, and the non-inverting input terminals of all the comparators are connected to the input terminals of the voltage comparison branch.

[0013] Optionally, the output of the voltage comparison branch is a TTL signal, and each TTL signal corresponds to a different button conduction state.

[0014] Optionally, to improve ease of operation, all the buttons are integrated into the same multi-touch button module.

[0015] Optionally, to improve maintenance economy, the single conductor is divided into two segments, which are connected through a mating port.

[0016] Secondly, this utility model also provides a medical electronic endoscope, including the button circuit for a medical electronic endoscope as described in any of the above claims, and further including a processing unit;

[0017] The output terminal of the voltage comparison branch is connected to the input terminal of the processing unit, and the number of output terminals of the voltage comparison branch is the same as the number of input terminals of the processing unit.

[0018] The above scheme has the following beneficial effects:

[0019] This invention discloses a button circuit for a medical electronic endoscope. The transmitting circuit comprises a voltage divider and series resistor branch and a button branch, while the receiving circuit comprises a voltage comparison branch. This allows the transmitting circuit to generate voltages of different amplitudes based on different button conduction combinations, which are then transmitted to the receiving circuit via a single wire. The receiving circuit then reconstructs the button signals from the received voltages. This button circuit uses voltage, a type of electrical signal resistant to external interference, to transmit button operation states, improving the stability of button-type medical electronic endoscopes. Furthermore, since the button circuit uses different voltage amplitudes to represent different button operation states, only a single wire is needed for transmission. Using a single wire reduces wire costs and diameter, facilitating signal transmission and simplifying the manufacturing process. Additionally, while satisfying the requirement of multi-button signal reconstruction, using a single wire also reduces interference with high-speed endoscopic image signals, improving the image quality and transmission stability of the original medical electronic endoscope signal. Attached Figure Description

[0020] Figure 1 This is a circuit structure diagram of a button circuit for a medical electronic endoscope provided in one embodiment of the present invention;

[0021] Figure 2 This is a flowchart of a button control process using a button circuit for a medical electronic endoscope, provided in one embodiment of the present invention.

[0022] The symbols are explained as follows:

[0023] 101. Voltage divider and series resistor branch; 102. Button branch; 103. Single wire; 104. Voltage comparison branch; 105. Processing unit. Detailed Implementation

[0024] To make the technical problems, technical solutions and beneficial effects solved by this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and embodiments.

[0025] It should be understood that the embodiments described below represent essential information to enable those skilled in the art to implement the embodiments and to illustrate the best mode of implementation. Upon reading the following description in conjunction with the accompanying drawings, those skilled in the art will understand the concepts of this disclosure and recognize the applications of these concepts not specifically mentioned herein. It should be understood that these concepts and applications fall within the scope of this disclosure and the appended claims.

[0026] It should also be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] It should also be understood that when a component is referred to as "connected" or "coupled" to another component, it can be directly connected or coupled to the other component, or there may be intermediate components. Conversely, when an element is referred to as "directly connected" or "directly coupled" to another element, there are no intermediate components.

[0028] It should also be understood that the terms “upper,” “lower,” “left,” “right,” “front,” “back,” “bottom,” “middle,” “center,” “top,” etc., may be used herein to describe various elements, indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing the present invention and to simplify 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, these elements should not be limited by these terms.

[0029] These terms are used only to distinguish one element from another. For example, a first element may be referred to as the “upper” element, and similarly, a second element may be referred to as the “upper” element depending on the relative orientation of these elements, without departing from the scope of this disclosure.

[0030] To be further understood, the terms “comprising,” “including,” “including,” and / or “include” as used herein specify the presence of the said feature, integer, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0031] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that the terms used herein should be interpreted as having the same meaning as they mean in the context of this specification and related art, and will not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0032] In one embodiment, a method such as Figure 1 The button circuit shown is for a medical electronic endoscope and includes a transmitter on the right and a receiver on the left.

[0033] The transmitting end is configured to generate voltages of different amplitudes when different buttons in the button circuit are turned on, and transmit them to the receiving end via a single wire 103. The receiving end is used to generate different control signals according to the different amplitudes of the received voltages.

[0034] In practical operation, it is preferable to set up a voltage divider series resistor branch 101 and a button branch 102 at the transmitting end to generate voltages with different amplitudes when different buttons are turned on, and to set up a voltage comparison branch 104 at the receiving end to generate different control signals according to the different amplitudes of the received voltages. To ensure the generation of different amplitude voltages and different control signals, the power supply terminal of the voltage divider series resistor branch 101 is connected to the positive power supply, i.e., VCC. The output terminal of the voltage divider series resistor branch 101 is connected to the input terminal of the voltage comparison branch 104 through the single wire 103. The input terminal of the voltage divider series resistor branch 101 is connected to the output terminal of the button branch 102, and the input terminal of the button branch 102 is grounded.

[0035] like Figure 1 As shown, this embodiment uses a key branch 102 that includes 3 keys as an example for explanation.

[0036] Since button branch 102 includes three buttons (S1, S2, and S3), it also requires three output terminals. Each output terminal of button branch 102 is connected to its input terminal via a different button, and the input terminal of button branch 102 is grounded. The function of button branch 102 is to adjust the voltage amplitude at the output terminal of the voltage divider series branch (i.e., the input terminal of the voltage comparator branch 104) by activating different buttons. Therefore, to ensure that the voltage divider series resistor branch 101 can generate different voltage amplitudes depending on the activation status of different buttons in button branch 102, at least three voltage divider resistors must be installed in the voltage divider series resistor branch 101, the same number as the number of buttons.

[0037] Specifically, the voltage divider series resistor branch 101 includes three voltage divider resistors R1, R2, and R3, and three output terminals. These three resistors are connected in series, with any two adjacent resistors forming a series connection point. In other words, the connection point between any two adjacent voltage divider resistors is considered a series connection point. Therefore, the end of the first voltage divider resistor R1 furthest from the second voltage divider resistor R2, or the non-series connection point of the first voltage divider resistor R1, is designated as the... Figure 1The upper end of R1 is connected to the power supply terminal of the voltage divider series resistor branch 101. The end of the nth voltage divider resistor furthest from the input terminal of the voltage divider series resistor branch 101, that is, the lower end of the nth voltage divider resistor, or the nth series node, is connected to the nth input terminal of the voltage divider series branch. For example, the lower end of the first voltage divider resistor R1, that is, the first series node, is connected to the left side of the switch button S3. The connection point between the lower end of the voltage divider resistor R1 and the switch button S3, that is, the first series node, serves as the first input terminal of the voltage divider series branch. The lower end of the second voltage divider resistor R2, that is, the second series node, is connected to the left side of the switch button S2. The lower end of the voltage divider resistor R2, i.e., the connection point between the second series node and the switch button S2, is used as the second input terminal of the voltage divider series branch. As for the last voltage divider resistor R3, its lower end, i.e., the non-series node end of the third voltage divider resistor R3, is connected to the left side of the switch S1, and the connection point between the non-series node of the voltage divider resistor R3 and the switch button S1 is used as the third input terminal of the voltage divider series branch. The end of the first voltage divider resistor R1 that is away from the power supply terminal of the voltage divider series branch 101, i.e., the lower end of the voltage divider resistor R1 or the first series node, is connected to the output terminal of the voltage divider series branch 101.

[0038] Although Figure 1 The voltage divider series resistor branch 101 is also grounded through the fourth voltage divider resistor R4. However, in this embodiment, the voltage divider series resistor branch 101 does not include the voltage divider resistor R4 and has no grounding terminal. This branch structure, which is not grounded through the voltage divider resistor R4, does not affect the function of the voltage divider series resistor branch 101 generating different voltage amplitudes at the output terminal when different buttons are turned on.

[0039] Of course, in other embodiments, to improve the stability and safety of the regulated voltage output of the voltage divider series resistor branch 101, such as... Figure 1 The voltage divider series resistor branch 101 shown may also include a ground terminal and a fourth voltage divider resistor R4. The end of the third voltage divider resistor R3 that is away from the input terminal of the voltage divider series resistor branch 101, that is, the lower end of the voltage divider resistor R3 or the non-series node end of the voltage divider resistor R3, is connected to the ground terminal of the voltage divider series resistor branch 101 through the fourth voltage divider resistor R4. The ground terminal of the voltage divider series resistor branch 101 is grounded.

[0040] Similarly, since button branch 102 includes 3 buttons, to ensure that voltage comparison branch 104 can generate new and different voltage levels when different buttons are turned on, when all switches are off, it is necessary to... Figure 1As shown, the voltage comparison branch 104 includes at least three comparators OP1, OP2, and OP3, and three output terminals GPIOA, GPIOB, and GPIOC. The non-inverting input of each comparator is connected to the input of the voltage comparison branch 104. The outputs of each comparator are connected to different outputs of the voltage comparison branch 104; that is, the output of the first comparator OP1 is connected to GPIOA, the output of the second comparator OP2 is connected to GPIOB, and the output of the third comparator OP3 is connected to GPIOC. Simultaneously, the inverting inputs of each comparator are connected to different reference voltages. It is easy to understand that the outputs of the voltage comparison branch are TTL signals, and each TTL signal corresponds to a different button's on / off state.

[0041] Regarding the reference voltage connected to the inverting input of each comparator, this embodiment, for example... Figure 1 As shown, to improve the convenience of the reference voltage adjustment arrangement, it is preferable to set up a reference voltage generation sub-branch with the same number of comparators to provide reference voltages for each comparator. Specifically, a first reference voltage generation sub-branch is formed by connecting resistors R5 and R6 in series between the positive power supply terminal VCC and the ground terminal, and the connection point between resistors R5 and R6 is used as the reference voltage output terminal of this reference voltage generation sub-branch, outputting reference voltage V1; a second reference voltage generation sub-branch is formed by connecting resistors R7 and R8 in series between the positive power supply terminal VCC and the ground terminal, and the connection point between resistors R7 and R8 is used as the reference voltage output terminal of this reference voltage generation sub-branch, outputting reference voltage V2; a third reference voltage generation sub-branch is formed by connecting resistors R9 and R10 in series between the positive power supply terminal VCC and the ground terminal, and the connection point between resistors R9 and R10 is used as the reference voltage output terminal of this reference voltage generation sub-branch, outputting reference voltage V3. It is easy to understand that the reference voltages V1, V2, and V3 are all different, and their specific values ​​need to be determined based on the voltage amplitude output by the voltage divider series resistor branch 101 when different switch buttons are turned on.

[0042] In other embodiments, to improve the integration of the voltage comparison branch 104, a single reference voltage generation sub-branch can generate reference voltages V1, V2, and V3 respectively. The structure of this single reference voltage generation sub-branch can be similar to that of the voltage divider series resistor branch 101, consisting of a number of voltage divider resistors, no less than the number of comparators, connected in series between the positive terminal of the power supply and the ground terminal, with different reference voltage output terminals led out between different adjacent resistors. To improve the ease of operation for medical personnel, in actual operation, it is preferable to integrate all buttons onto the same multi-contact button module. Specifically, in this embodiment, it can be as follows: Figure 1 as well as Figure 2 As shown, the button module is set as a left-right rotation self-reset switch with button. The left-right rotation self-reset switch with button is an integrated switch. Left rotation, right rotation and pressing get three state signals. The left rotation, right rotation and pressing respectively activate buttons S1, S2 and S3.

[0043] Furthermore, to improve the maintenance economy of the button circuit in this embodiment, the single wire 103 is configured as two segments, which are connected through a mating port. This allows for easy replacement of only the damaged part when either the transmitting or receiving end fails, without replacing the entire button circuit structure. The single wire can be one of a multi-strand transmission line, while other transmission lines can serve as image signal transmission lines and power lines for medical electronic endoscopes. Preferably, the single wire in this embodiment is a coaxial cable.

[0044] Based on the specific structure of the button circuit in this embodiment, the formula for calculating the voltage output value at the output terminal of the voltage divider series resistor branch 101 is as follows:

[0045] No operation: V = VCC / (R1+R2+R3+R4) * (R2+R3+R4), denoted as Va;

[0046] When the button is pressed, S3 is active: V = 0, marked as Vb;

[0047] When the button is rotated left, S2 is active: V = VCC / (R1+R2) * R2, marked as Vc;

[0048] When the button is rotated to the right, S1 is active: V = VCC / (R1+R2+R3) * (R2+R3), marked as Vd.

[0049] At this point, the voltage relationship is: Vb <Vc<Vd<Va。

[0050] The calculation formulas for each reference voltage value in voltage comparison branch 104 are as follows:

[0051] V1 = VCC / (R5+R6) * R6;

[0052] V2 = VCC / (R7+R8) * R8;

[0053] V3 = VCC / (R9+R10) * R10.

[0054] It is easy to understand that in order to ensure that four level states are successfully output by the voltage comparison branch 104 in the four states of the key module not being pressed, pressed, rotated left, and rotated right to be used as four control signals respectively, the above voltage relationships should be set as: Vb < V1 < Vc < V2 < Vd < V3 < Va.

[0055] For the sake of easy understanding, the working principle of the present invention will be introduced below by taking Figure 2 actual examples:

[0056] First, set VCC to 5V, R1 = 1kΩ, R2 = 510Ω, R3 = 1.5kΩ, R1 = 47kΩ. Then, according to the above calculation formula, it can be known that at this time Va = 3.24V, Vb = 0V, Vc = 1.11V, Vd = 2.21V.

[0057] In addition, set R5 = 4.7kΩ, R6 = 2.26kΩ, R7 = 5.1kΩ, R8 = 680kΩ, R9 = 1kΩ, R10 = 1.2kΩ. Then, according to the above calculation formula, it can be known that at this time V1 = 1.62V, V2 = 0.58V, V3 = 2.74V.

[0058] After the operator connects the single wire 103 between the sending end and the receiving end through the docking port, when the operator rotates the key module to the left, the sending end outputs Vc [1.11V]. At this time, the voltage relationship is V2 [0.58V] < Vc [1.11V] < V1 [1.62V] < V3 [2.74V]. Then, each comparator in the voltage comparison branch 104 outputs GPIOA = low level, GPIOB = high level, GPIOC = low level;

[0059] When the operator rotates the key module to the right, the sending end outputs Vd [2.21V]. At this time, the voltage relationship is V2 [0.58V] < V1 [1.62V] < Vd [2.21V] < V3 [2.74V]. Then, each comparator in the voltage comparison branch 104 outputs GPIOA = high level, GPIOB = high level, GPIOC = low level;

[0060] When the operator presses the key module, the sending end outputs Vb [0V]. At this time, the voltage relationship is Vb [0V] < V2 [0.58V] < V1 [1.62V] < V3 [2.74V]. Then, each comparator in the voltage comparison branch 104 outputs GPIOA = low level, GPIOB = low level, GPIOC = low level;

[0061] When the operator does not operate the key module, the sending end outputs Va[3.24V]. At this time, the voltage relationship is V2[0.58V]<V1[1.62V]<V3[2.74V]<Va[3.24V]. Then, for each comparator in the voltage comparison branch 104, the outputs are GPIOA = high level, GPIOB = high level, and GPIOC = high level.

[0062] Finally, the high and low level relationship of the comparator outputs in the voltage comparison branch 104 as shown in Table 1 below can be obtained.

[0063] Table 1 High and low level relationship of comparator outputs

[0064] As Figure 2 shown, in this embodiment, the control signals corresponding to pressing, left rotation, and right rotation of the key module are respectively used to control the start / stop flow rate, decrease flow rate, and increase flow rate of the peristaltic pump. Based on this, there is: left rotation to decrease the flow rate, on the one hand, the decreased adjustment value is displayed on the display, and on the other hand, the speed of the peristaltic pump (the power for perfusion flow rate) decreases, and the right rotation is vice versa. The start / stop flow rate switches to start and stop the peristaltic pump, thereby starting and closing the perfusion flow rate.

[0065] Corresponding to the above embodiment, in another embodiment, a medical electronic endoscope is provided. The medical electronic endoscope includes the key circuit for the medical electronic endoscope in the foregoing embodiment, and also includes a processing unit 105 as Figure 1 shown. The input end of the processing unit 105 is connected to the output end of the voltage comparison branch 104. Since the output end of the voltage comparison branch outputs a TTL signal, and each TTL signal output corresponds to a different key conduction state, in order to ensure that the processing unit 105 accurately identifies the high and low level states output by each comparator in the voltage comparison branch 104, preferably, the number of output ends of the voltage comparison branch 104 is set to be the same as the number of input ends of the processing unit 105. Specifically, still taking the voltage comparison branch 104 in the above embodiment including 3 output ends GPIOA, GPIOB, and GPIOC as an example, it is preferably set that the input ends of the processing unit 105 are also 3, and each input end is respectively connected to one of the 3 output ends of the voltage comparison branch 104.

[0066] It is easy to understand that a medical electronic endoscope usually also includes a camera module, an operation handle, an image signal transmission line, etc. However, these structures are well known to those skilled in the art, so they will not be described in detail; and, the principle and effect of the key circuit for the medical electronic endoscope in this medical electronic endoscope have been fully introduced in the foregoing embodiment, so they will not be described in this embodiment either.

[0067] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A button circuit for a medical electronic endoscope, characterized in that, include: Voltage divider series resistor branch, button branch, single wire and voltage comparison branch; The power supply terminal of the voltage divider series resistor branch is connected to the positive terminal of the power supply. The output terminal of the voltage divider series resistor branch is connected to the input terminal of the voltage comparison branch through the single wire. The input terminal of the voltage divider series resistor branch is connected to the output terminal of the button branch. The input terminal of the button branch is grounded.

2. The keypad circuit for a medical electronic endoscope according to claim 1, characterized in that, The button branch includes N buttons and N output terminals. The nth output terminal of the button branch is connected to the input terminal of the button branch through the nth button. .

3. The keypad circuit for a medical electronic endoscope according to claim 2, characterized in that, The voltage divider series resistor branch includes N voltage divider resistors and N input terminals. All the voltage divider resistors are connected in series, and any two adjacent voltage divider resistors form a series node. The non-series node of the first voltage divider resistor is connected to the power supply terminal of the voltage divider series resistor branch. The N-1 series nodes and the non-series node of the Nth voltage divider resistor are respectively connected to different input terminals of the voltage divider series resistor branch. The first series node is connected to the output terminal of the voltage divider series resistor branch.

4. The button circuit for a medical electronic endoscope according to claim 3, characterized in that, The voltage divider series resistor branch also includes a ground terminal and an N+1th voltage divider resistor. The non-series node of the Nth voltage divider resistor is connected to the ground terminal of the voltage divider series resistor branch through the N+1th voltage divider resistor, and the ground terminal of the voltage divider series resistor branch is grounded.

5. The key circuit for a medical electronic endoscope according to claim 3 or 4, characterized in that, The voltage comparison branch includes N comparators, N reference voltage generation sub-branches, and N output terminals. The reference voltage output terminal of the nth reference voltage generation sub-branch is connected to the inverting input terminal of the nth comparator, the output terminal of the nth comparator is connected to the nth output terminal of the voltage comparison branch, and the non-inverting input terminals of all the comparators are connected to the input terminals of the voltage comparison branch.

6. The keypad circuit for a medical electronic endoscope according to claim 3 or 4, characterized in that, The voltage comparison branch includes N comparators, a reference voltage generation sub-branch, and N output terminals. The reference voltage generation sub-branch includes N reference voltage output terminals. The nth reference voltage output terminal is connected to the inverting input terminal of the nth comparator. The output terminal of the nth comparator is connected to the nth output terminal of the voltage comparison branch. The non-inverting input terminals of all the comparators are connected to the input terminals of the voltage comparison branch.

7. The keypad circuit for a medical electronic endoscope according to claim 1, characterized in that, The output of the voltage comparison branch is a TTL signal, and each TTL signal corresponds to a different button conduction state.

8. The button circuit for a medical electronic endoscope according to claim 2, characterized in that, All the buttons mentioned are integrated into the same multi-touch button module.

9. The button circuit for a medical electronic endoscope according to claim 1, characterized in that, The single conductor consists of two segments, which are connected by a docking port.

10. A medical electronic endoscope, characterized in that, The device includes a button circuit for a medical electronic endoscope as described in any one of claims 1 to 9, and further includes a processing unit; The output terminal of the voltage comparison branch is connected to the input terminal of the processing unit, and the number of output terminals of the voltage comparison branch is the same as the number of input terminals of the processing unit.

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