Keying circuit, keying assembly and medical imaging device

Abstract

The utility model relates to a kind of keying circuit, key assembly and medical imaging equipment, wherein the keying circuit includes: at least one key switch and level conversion module;Key switch includes normally open contact and normally closed contact;Normally open contact is connected with external execution device, for responding to key operation, corresponding first signal is output to external execution device;Level conversion module is connected with normally closed contact and external execution device, for responding to key operation, corresponding second signal is output to external execution device;First signal and second signal jointly control the trigger of external execution device, solve the problem that functional key is easy to fail, cause the reliability and stability of device low, it is realized to reduce the risk of functional key failure, improve the reliability and stability of device.

Description

Technical Field

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

[0002] Currently, in many applications (such as motion, exposure, and fluoroscopy function buttons on medical devices), buttons with two normally open contacts are commonly used. The aim is to trigger signals through the synchronous action of the two contacts. However, because the two contacts are highly similar in physical structure and working principle, both contacts can easily fail simultaneously during use, resulting in complete loss of button functionality and severely reducing the reliability and stability of the device.

[0003] There is currently no effective solution to the problem that function buttons in related technologies are prone to failure, resulting in low device reliability and stability. Utility Model Content

[0004] Therefore, it is necessary to provide a button circuit, button assembly, and medical imaging device to address the problem that function buttons in the existing technology are prone to failure, resulting in low reliability and stability of the device.

[0005] In the first aspect, this utility model provides a button circuit, including: at least one button switch and a level conversion module; wherein, the button switch includes normally open contacts and normally closed contacts;

[0006] The normally open contact is connected to an external execution device and is used to output a corresponding first signal to the external execution device in response to a key operation.

[0007] The level conversion module is connected to the normally closed contact and the external execution device, and is used to output a corresponding second signal to the external execution device in response to the key operation;

[0008] The external execution device is triggered by the first signal and the second signal in concert.

[0009] In some embodiments, the level conversion module includes resistor R1, resistor R2, and a processing unit;

[0010] One end of resistor R1 is connected to the input voltage; the other end of resistor R1 is connected to the normally closed contact and one end of resistor R2.

[0011] One end of the resistor R2 is connected to the normally closed contact; the other end of the resistor R2 is connected to the processing unit.

[0012] In some embodiments, the resistance value of the resistor R1 is associated with the input voltage and the driving parameters of the processing unit.

[0013] In some of these embodiments, the processing unit is an optocoupler or a solid-state relay.

[0014] In some embodiments, there are multiple push-button switches, and the normally closed contacts of each push-button switch are connected in series to the level conversion module.

[0015] In some embodiments, the push-button switch is an exposure push-button switch, a perspective push-button switch, or a motion push-button switch.

[0016] In some embodiments, the push-button switch is a micro switch.

[0017] Secondly, the present invention provides a button assembly, which includes the button circuit described in any one of the first aspects above.

[0018] Thirdly, this utility model provides a medical imaging device, which includes the button assembly described in the second aspect above.

[0019] Fourthly, this utility model provides a digital subtraction angiography device, which includes the button assembly described in the second aspect above.

[0020] Compared with related technologies, the present invention provides a button circuit, button assembly, and medical imaging device. The button circuit includes at least one button switch and a level conversion module. The button switch includes a normally open contact and a normally closed contact. The normally open contact is connected to an external actuator and is used to output a corresponding first signal to the external actuator in response to a button operation. The level conversion module is connected to the normally closed contact and the external actuator and is used to output a corresponding second signal to the external actuator in response to a button operation. The first and second signals jointly control the triggering of the external actuator, solving the problem of easy failure of function buttons leading to low reliability and stability of the device. This reduces the risk of function button failure and improves the reliability and stability of the device.

[0021] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent. Attached Figure Description

[0022] Figure 1 This is a structural block diagram of a button circuit provided in one embodiment of this application;

[0023] Figure 2This is a schematic diagram of a button circuit provided in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the button circuit of a multi-function button provided in one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a multi-motion button circuit provided in one embodiment of this application;

[0026] Figure 5 This is a schematic diagram of a handbrake button provided in an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of a DSA vertical arm motion button provided in an embodiment of this application;

[0028] Figure 7 This is a schematic diagram of the motion button of a large flat panel detector for DSA provided in one embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the motion button of the DSA small flat panel detector provided in one embodiment of this application.

[0030] Reference numerals: 10, push-button switch; 20, level conversion module; 30, external actuator; 100, handbrake; 101, board assembly; 200, vertical arm; 201, first motion button; 300, large field-of-view flat panel detector; 301, second motion button; 400, small field-of-view flat panel detector; 401, third motion button. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Currently, in many applications (such as motion, exposure, and fluoroscopy function buttons on medical devices), buttons with two normally open contacts are commonly used. The aim is to trigger signals through the synchronous action of the two contacts. However, because the two contacts are highly similar in physical structure and working principle, both contacts can easily fail simultaneously during use, resulting in complete loss of button functionality and severely reducing the reliability and stability of the device.

[0033] Compared to existing technologies, the button circuit in this application includes at least one button switch and a level conversion module. The button switch includes a normally open contact and a normally closed contact. The normally open contact is connected to an external actuator and outputs a corresponding first signal to the external actuator in response to a button operation. The level conversion module is connected to the normally closed contact and the external actuator and outputs a corresponding second signal to the external actuator in response to a button operation. The first and second signals jointly control the triggering of the external actuator. Based on this, by introducing a pair of heterogeneous normally open and normally closed contacts, simultaneous failure of both contacts due to a single common fault is avoided. Furthermore, the level conversion module converts the state of the normally closed contact into a second signal that can be logically determined in conjunction with the first signal. This ensures that the external actuator can only be triggered based on a specific and effective combination of the two heterogeneous signals. This not only provides fault tolerance and prevents malfunctions but also further enhances robustness against contact failures. It solves the problem of easy failure of function buttons leading to low reliability and stability of the device, thereby reducing the risk of function button failure and improving the reliability and stability of the device.

[0034] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the present invention.

[0035] This utility model provides a button circuit. Figure 1 This is a structural block diagram of a button circuit according to an embodiment of the present invention. (Refer to...) Figure 1 As shown, the button circuit includes at least one button switch 10 and a level conversion module 20; wherein, the button switch 10 includes normally open contacts and normally closed contacts;

[0036] A normally open contact is connected to an external actuator 30 and is used to output a corresponding first signal to the external actuator 30 in response to a key operation.

[0037] The level conversion module 20 is connected to the normally closed contact and the external actuator 30, and is used to output a corresponding second signal to the external actuator 30 in response to the key operation.

[0038] The external execution device 30 is triggered by the coordinated action of the first and second signals.

[0039] It is understood that the external execution device 30 can be a medical imaging device, such as a digital subtraction angiography (DSA) device or a computed tomography (CT) device. Medical imaging devices typically trigger operations such as exposure, fluoroscopy, and motion via buttons. Alternatively, the external execution device 30 can also be other devices or equipment that require control via buttons, and this embodiment of the application does not limit this.

[0040] In this embodiment, the button circuit includes at least one button switch 10, which includes a normally open contact and a normally closed contact. When the button is pressed, the normally open contact closes and the normally closed button opens; when the button is released, the normally open contact opens and the normally closed button closes.

[0041] Since the normally open contact is connected to the external actuator 30, when the button is pressed, it outputs a first signal to the external actuator 30, which is a switch closure signal. Simultaneously, the button circuit also includes a level conversion module 20, which is connected to both the normally closed contact and the external actuator 30. When the button is pressed, the level conversion module 20 converts the normally closed contact signal to a new level and outputs a second signal to the external actuator 30, which is also a switch closure signal. Thus, the first and second signals work together to activate the external actuator 30, triggering it to perform a corresponding action or function, such as exposure, fluoroscopy, or motion in medical imaging equipment.

[0042] It should be noted that when the button is released, the normally open contact opens, and the first signal output to the external actuator 30 is a switch-off signal. Simultaneously, based on the closed state of the normally closed contact, the level conversion module 20 outputs a second signal to the external actuator 30, which is also a switch-off signal. Since both the first and second signals are switch-off signals, the external actuator 30 will not be triggered to perform any corresponding action or function.

[0043] Therefore, the button circuit design provided in this application adopts a mechanism of normally open-normally closed heterogeneous contact combination and level conversion module 20 working together, fundamentally avoiding the risk of simultaneous failure due to contact homogenization. Furthermore, the external execution device 30 only performs actions based on a specific logic combination of the first signal and the converted second signal, achieving proactive fault tolerance for single contact failures, significantly reducing the probability of function button failure, and improving the reliability and stability of the device.

[0044] In some embodiments, the level conversion module 20 includes resistors R1 and R2 and a processing unit;

[0045] One end of resistor R1 is connected to the input voltage; the other end of resistor R1 is connected to the normally closed contact and one end of resistor R2.

[0046] One end of resistor R2 is connected to a normally closed contact; the other end of resistor R2 is connected to the processing unit.

[0047] Understandably, when the button is released, the normally closed contact is closed, and its branch is in a closed state. At this time, the connection point of resistors R1 and R2 is at a low level, thus the input to the processing unit is at a low level. The processing unit converts and processes the input signal, and the second signal output to the external execution device 30 is a switch open signal.

[0048] When the button is pressed, the normally closed contact opens, and its branch is in an open-circuit state. At this time, the connection point of resistors R1 and R2 is at a high level, thus the input of the processing unit is at a high level. The processing unit converts and processes the input signal and outputs a second signal to the external execution device 30 to ensure effective and stable signal transmission.

[0049] For example, refer to Figure 2 As shown, one end of the normally closed contact of the push-button switch (K1) is grounded, and the other end is connected to resistor R1. The level conversion module 20 also includes a transient voltage suppressor (TVS), with TVS1, TVS2, and the processing unit (U1) all grounded. TVS1 is connected to the junction of resistors R1 and R2 to clamp the junction voltage within a safe range when the circuit generates transient high voltage, preventing excessive voltage from damaging the input pins of U1 (such as the optocoupler input). TVS2 is connected to the output of U1 and then grounded, responsible for overvoltage protection of the U1 output, thereby improving the reliability of the circuit.

[0050] Thus, the level conversion module 20, composed of resistors R1 and R2 and a processing unit, accurately converts the closed / open state of the normally closed contact into the corresponding second signal, realizing reliable state identification and providing a stable input for subsequent collaborative logic discrimination of the two signals.

[0051] In some of these embodiments, the resistance value of resistor R1 is associated with the input voltage and the driving parameters of the processing unit.

[0052] Understandably, one end of resistor R1 is connected to the input voltage VCC, and the input voltage determines the range of the voltage difference across resistor R1. When the input voltage is high, a larger value resistor R1 is needed to limit the loop current and prevent excessive current; when the input voltage is low, a smaller value resistor R1 is needed to ensure sufficient driving capability.

[0053] Meanwhile, the input terminal of the processing unit has specific current drive requirements. If the resistance value of resistor R1 is too large, the input current will be lower than the minimum drive current of the processing unit, causing the signal recognition of the processing unit to fail; if the resistance value of resistor R1 is too small, the input current may exceed the maximum current allowed by the processing unit, which may damage the device.

[0054] For example, refer to Figure 3 As shown, the processing unit is an optocoupler of model HSSR-61A06-2. The VCC supply voltage range is 3-35V. The specific models of TVS1 and TVS2 (such as SMBJ24CA, SMBJ28CA, etc.) need to be selected according to the VCC supply voltage. The operating current of HSSR-61A06-2 is 7-12mA, the maximum input voltage of HSSR-61A06-2 is 1.7V, and the resistance value of resistor R2 in the circuit is set to 100Ω. Based on the operating current requirements of the optocoupler, the value of resistor R1 must satisfy the following formula:

[0055]

[0056] Therefore, by reasonably selecting the resistance value of resistor R1 based on the input voltage and the driving parameters of the processing unit, the circuit can be made to work stably, thereby ensuring the normal functioning of the entire button circuit.

[0057] In some of these embodiments, the processing unit is an optocoupler or a solid-state relay.

[0058] Specifically, when the processing unit uses an optocoupler, it typically contains a light-emitting diode and a photosensitive receiver. When the button is released, the normally closed contact closes, pulling the node between resistors R1 and R2 down to near ground potential, and the second signal output by the optocoupler is a switch-off signal; when the button is pressed, the normally closed contact opens, generating a valid trigger signal at the output of the optocoupler.

[0059] Similarly, if the processing unit uses a solid-state relay, the implementation principle is similar to that of an optocoupler, in order to accurately convert the output to the second signal corresponding to the button state and ensure the effective and stable transmission of the signal.

[0060] In some embodiments, there are multiple push-button switches 10, and the normally closed contacts of each push-button switch 10 are connected in series to the level conversion module 20.

[0061] Specifically, when there are multiple push-button switches 10, the normally closed contacts of each push-button switch 10 are connected in series. One end of this series circuit is connected to the input terminal of the level conversion module 20, and the other end is grounded.

[0062] When none of the buttons are pressed, the normally closed contacts of all the button switches 10 remain closed, the series circuit is conductive, and the connection point of resistors R1 and R2 is at a low level. At this time, the second signal output by the level conversion module 20 to the external actuator 30 is a switch open signal.

[0063] When any one or more buttons are pressed, the normally closed contact of that button opens. Since the normally closed contacts are connected in series, the opening of a single contact makes the entire series circuit open, and the connection point of resistors R1 and R2 changes to a high level. At this time, the second signal output by the level conversion module 20 to the external execution device 30 is a switch closing signal.

[0064] It should be noted that each button switch 10 can be a different function button. For example, refer to... Figure 3 As shown, the button circuit includes both an exposure button switch (K1) and a perspective button switch (K2). The first signal of the exposure button switch is a primary trigger signal (Expose), and the second signal is a secondary trigger signal (SumRel). Similarly, the first signal of the perspective button switch is a primary trigger signal (Fluoro), and the second signal is a secondary trigger signal (SumRel). (Refer to...) Figure 4 As shown, the button circuit also includes multiple motion button switches (K1 to Kn), with the first signal being a function trigger signal and the second signal being a Deadman (DM) trigger signal to control the movement of different device structures. It should be understood that the above combination is merely an example and not a limitation.

[0065] Furthermore, since the normally open contacts of each button switch 10 are independently connected to the external actuator 30, the independent function triggering of each button is isolated from each other and does not interfere with each other.

[0066] Through this embodiment, multiple button switches 10 can be flexibly configured according to the specific needs of different application scenarios. Multiple functions can be triggered and processed in parallel in a single circuit, which not only ensures the independence and integrity of each function control, but also provides flexible multi-tasking operation capabilities.

[0067] In some embodiments, the push-button switch 10 is an exposure push-button switch, a perspective push-button switch, or a motion push-button switch.

[0068] Specifically, the normally open contacts of each button switch 10 are independently connected to the corresponding functional unit of the external execution device 30. Among them, the normally open contact of the exposure button switch is connected to the exposure control unit to trigger the exposure function of the imaging device; the normally open contact of the fluoroscopy button switch is connected to the fluoroscopy control unit to turn the real-time fluoroscopy function on and off; and the normally open contact of the motion button switch is connected to the motion control unit to control the movement of the equipment structure such as the bed or frame.

[0069] It should be noted that the first and second signals together constitute the triggering logic, and their specific functions vary depending on the button type. For exposure and perspective buttons, the first signal is a primary trigger signal, and the second signal is a secondary trigger signal. For motion buttons, the first signal is a functional trigger signal, and the second signal is usually a Deadman trigger signal to ensure that the device only continues to move when the button is continuously pressed, and stops moving once the button is released.

[0070] Taking a specific application scenario of DSA equipment as an example, the exposure button switch is used to trigger the acquisition of the contrast sequence, the fluoroscopy button switch controls low-dose real-time imaging, and the motion button switch is responsible for adjusting the angle of the C-arm and the position of the bed, etc.

[0071] This embodiment satisfies the medical device's need for multi-functional independent operation while ensuring the flexibility and reliability of rapid switching between multiple imaging modes in complex scenarios, thereby significantly improving operational efficiency and user experience.

[0072] In some of these embodiments, the push-button switch 10 is a micro switch.

[0073] It is understood that a micro switch is a switching element with a small actuation stroke and clear tactile feedback. Its operating force range is typically controlled between 0.5N and 2.5N, which is significantly lower than the operating force requirements of conventional mechanical switches. In the specific implementation of this embodiment, the normally open contact of the micro switch is connected to the signal input terminal of the external actuator 30, while its normally closed contact is connected to the level conversion module 20.

[0074] Taking the control lever of medical imaging equipment as an example, refer to Figure 5 As shown, the control button for the handbrake adopts a micro switch design integrated into the board component 101, which allows users to easily and accurately control the exposure, perspective, and motion functions of the equipment during long-term operation, thereby improving the comfort of operation and ensuring the accurate transmission of control commands.

[0075] This embodiment demonstrates that using microswitches in buttons significantly reduces the pressure required for operation while ensuring reliable signal triggering. This not only improves the human-computer interaction experience but is also particularly suitable for applications requiring frequent operation or precise control (such as medical devices). The characteristics of microswitches effectively alleviate operator finger fatigue, improving comfort and operational efficiency during extended work periods. This helps reduce the probability of unexpected signal termination and the duration and probability of button press circuit output jitter, thereby enhancing the stability of button operation.

[0076] This embodiment also provides a button assembly, which includes any of the button circuits described above.

[0077] The button circuit has been described in the above embodiments and will not be repeated here.

[0078] This embodiment also provides a medical imaging device, which includes the aforementioned button assembly.

[0079] This embodiment also provides a digital subtraction angiography device, which includes the button components described above.

[0080] Reference Figure 5 As shown, the DSA device is equipped with a handbrake 100, which integrates multiple function buttons, including an exposure button, a perspective button, and a motion button. The circuitry of each button is implemented based on the architecture described in this application, which includes normally open contacts, normally closed contacts, and a level conversion module 20, ensuring that each function can be triggered independently and in parallel.

[0081] In this way, by highly integrating multiple key control functions into a single handbrake, the convenience and efficiency of medical imaging equipment in complex operations are significantly improved.

[0082] Reference Figures 6-8 As shown, the buttons are used for motion control of the DSA device. Specifically, a first motion button 201 is provided on the vertical arm 200 of the DSA device to directly control the lifting or rotating movement of the vertical arm 200; a second motion button 301 is provided on the large field-of-view flat panel detector 300 of the DSA device to control the movement or positioning of the flat panel detector; and a third motion button 401 is provided on the small field-of-view flat panel detector 400 of the DSA device to control the precise positioning movement of the small field-of-view flat panel detector 400.

[0083] In this way, by integrating the control buttons onto each motion actuator, the operator no longer needs to frequently travel between the control console and the equipment. When adjusting the position of the vertical arm 200 or the flat panel detector, the operator can perform the operation nearby and instantly, which significantly improves the efficiency and accuracy of equipment placement and positioning, while simplifying the operation process.

[0084] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0085] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0086] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0087] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A button circuit, characterized in that, include: At least one push-button switch and a level conversion module; wherein the push-button switch includes a normally open contact and a normally closed contact; The normally open contact is connected to an external execution device and is used to output a corresponding first signal to the external execution device in response to a key operation. The level conversion module is connected to the normally closed contact and the external execution device, and is used to output a corresponding second signal to the external execution device in response to the key operation; the external execution device is triggered by the first signal and the second signal.

2. The button circuit according to claim 1, characterized in that, The level conversion module includes resistor R1, resistor R2, and a processing unit; One end of resistor R1 is connected to the input voltage; the other end of resistor R1 is connected to the normally closed contact and one end of resistor R2. One end of the resistor R2 is connected to the normally closed contact; the other end of the resistor R2 is connected to the processing unit.

3. The button circuit according to claim 2, characterized in that, The resistance value of the resistor R1 is associated with the input voltage and the driving parameters of the processing unit.

4. The key circuit according to any one of claim 2 or claim 3, characterized in that, The processing unit is an optocoupler or a solid-state relay.

5. The button circuit according to claim 1, characterized in that, There are multiple push-button switches, and the normally closed contacts of each push-button switch are connected in series to the level conversion module.

6. The button circuit according to claim 1, characterized in that, The button switch is an exposure button switch, a perspective button switch, or a motion button switch.

7. The button circuit according to claim 1, characterized in that, The push-button switch is a micro switch.

8. A button assembly, characterized in that, The button assembly includes a button circuit as described in any one of claims 1 to 7.

9. A medical imaging device, characterized in that, The medical imaging device includes the button assembly as described in claim 8.

10. A digital subtraction angiography device, characterized in that, The digital subtraction angiography device includes the button assembly as described in claim 8.

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