A constant temperature exhaust recovery electric control device for T-tube contrast agent

Abstract

The utility model discloses a kind of constant-temperature exhaust recovery electric control device for T tube contrast medium. Including: constant-temperature controller, bubble detector, fluid driver, flow selector and emergency brake. Constant-temperature control is realized by negative temperature coefficient thermistor and double threshold relay;Bubble is detected and indicated by infrared photoelectric sensor;Peristaltic pump motor drives fluid;Injection, exhaust, recovery flow path switching is realized by operating button and reset relay control solenoid valve, and exhaust operation is automatically interlocked;Emergency brake, independent hardware over-temperature protector and pressure protector are connected in series in public power supply circuit.The device is integrated with pure hardware circuit to realize constant-temperature maintenance, bubble monitoring, fluid driving and flow selection, simplify operation, and improve reliability by multiple hardware safety redundancy.

Description

Technical Field

[0001] This utility model relates to the field of electrical control technology for medical auxiliary equipment, specifically an electrical control device for constant temperature exhaust recovery of contrast agents in T-tubes. Background Technology

[0002] In clinical T-tube contrast imaging, a temperature-controlled contrast agent needs to be injected into the patient. Before use, the contrast agent must be preheated to a suitable temperature and fully vented. Any remaining contrast agent after injection must be safely recovered. Currently, this procedure often relies on medical staff operating multiple separate devices or combinations of general-purpose instruments. For example, preheating is done using an independent water bath or heating plate, manual venting is performed, injection is administered using a standard syringe or peristaltic pump, and flow path switching is achieved by manually switching a three-way valve.

[0003] The existing operating methods described above have the following significant shortcomings: First, each step relies on manual coordination and judgment, resulting in cumbersome and inconsistent procedures that are prone to human error, impacting efficiency and safety. Second, there is a lack of integrated real-time bubble monitoring and indication, making bubble risk control dependent on operator experience and visual observation. More importantly, existing solutions typically lack systematic hardware safety redundancy design. For example, a malfunction such as relay contact sticking in the temperature control unit could lead to continuous heating; and without an independent overpressure protection mechanism, blockage in fluid lines could cause line rupture or patient injury. Furthermore, even with partially automated equipment, the core control logic largely relies on software programs, which carries the risk of unpredictable responses due to program malfunctions, crashes, or electromagnetic interference—a potential safety hazard in medical procedures requiring high reliability.

[0004] Therefore, there is a need for a dedicated control device that can deeply integrate constant temperature maintenance, bubble monitoring, fluid drive, flow path selection and multiple safety braking functions, and is implemented based on deterministic hardware circuitry, in order to improve the ease of operation, process reliability and intrinsic safety level of T-tube contrast agent processing. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a thermostatic exhaust recovery electronic control device for T-tube contrast agents, including a thermostatic controller, a bubble detector, a fluid actuator, a flow path selector, and an emergency brake. The thermostatic controller includes a temperature sensor and a first relay. The output terminal of the temperature sensor is connected to the coil of the first relay, and the contacts of the first relay are connected in series with a heating element. The signal output terminal of the bubble detector is connected to a status indicator component. The control input terminal of the fluid actuator is connected to a manual direction switch, and its power output terminal is connected to a peristaltic pump motor. The control input terminal of the flow path selector is connected to multiple manual selection buttons, and its output terminal is connected to a solenoid valve. The emergency brake is connected in series in the common power supply circuit of the fluid actuator and the flow path selector.

[0006] Preferably, the temperature sensor is a voltage divider circuit consisting of a negative temperature coefficient thermistor and a first fixed resistor connected in series; the first relay is a double threshold relay, and its coil is connected to the output terminal of the voltage divider circuit.

[0007] Preferably, it further includes a hardware over-temperature protector independent of the thermostat; the hardware over-temperature protector includes a comparison unit and an execution relay; the sampling terminal of the comparison unit is connected to the output terminal of the temperature sensor, the reference terminal is connected to a reference voltage, and its output terminal controls the coil of the execution relay through a switching unit; the normally closed contact of the execution relay is connected in series in the total power input circuit of the heating element.

[0008] Preferably, the comparison unit is a voltage comparator; the switching unit is a transistor; and the execution relay is a normally closed relay.

[0009] Preferably, the bubble detector is a through-beam infrared photoelectric sensor; the status indication component is a series circuit of a light-emitting diode and a current-limiting resistor connected to the output terminal of the infrared photoelectric sensor receiver tube.

[0010] Preferably, the solenoid valve is a three-position five-way dual-control solenoid valve, which includes a first solenoid coil and a second solenoid coil.

[0011] Preferably, the manual direction switch includes an interlocked forward switch and a reverse switch; the plurality of manual selection buttons include an injection button, an exhaust button, and a recovery button.

[0012] Preferably, the flow path selector further includes a reset control circuit, which includes a reset relay. When the exhaust button is operated, the coil of the reset relay is energized. At least one pair of normally closed contacts of the reset relay are connected in series in the circuit between the injection button and the first electromagnetic coil of the solenoid valve, and in the circuit between the recovery button and the second electromagnetic coil of the solenoid valve.

[0013] Preferably, the emergency brake is a normally closed emergency stop button.

[0014] Preferably, it also includes a pressure protector, whose protection contacts are connected in series in the common power supply circuit.

[0015] The beneficial effects of this utility model are: 1. The operation is simple and integrated. It integrates constant temperature, bubble monitoring, fluid drive and flow path switching functions into one, and centrally controls it through manual switch, which simplifies the operation steps and improves the continuity and reliability of the process.

[0016] 2. The response is reliable and certain. The core control and protection functions are implemented using pure hardware circuits, eliminating the uncertainty risks of software systems and ensuring that the timing of all actions is accurate and the behavior is predictable.

[0017] 3. Sufficient safety redundancy: Through independent hardware over-temperature and over-pressure protection circuits, combined with manual emergency stop, a multi-layered hardware safety protection system is constructed, which can proactively intercept faults from the root and ensure safety. Attached Figure Description

[0018] Figure 1 This is a system architecture diagram of the present invention; Figure 2 A circuit diagram illustrating one embodiment of the constant temperature control, bubble detection, fluid drive, and flow path selection of this utility model; Figure 3 A circuit diagram of one embodiment of adding a hardware over-temperature redundant protection circuit to the constant temperature control part of this utility model. Figure 4 A circuit diagram of one embodiment of the present invention, which adds a pressure protection circuit to the fluid drive and flow path selection part.

[0019] Figure Labels RT1 is a negative temperature coefficient thermistor, K1 is the first relay, EH is a heating element, U2 is a through-beam infrared photoelectric sensor, R1 is the first fixed resistor, R2 is a current-limiting resistor, R3 is a current-limiting resistor, R4 is a current-limiting resistor, R5 is a pull-up resistor, R6 is a current-limiting resistor, R7 is the first voltage divider resistor, R8 is the second voltage divider resistor, D1 is a light-emitting diode, S1 is a forward switch, S2 is a reverse switch, M is a DC motor, SB1 is an injection button, SB2 is an exhaust button, SB3 is a retraction button, YV1 is the first electromagnetic coil, YV2 is the second electromagnetic coil, K3 is a reset relay, K3-1 is the first normally closed contact, K3-2 is the second normally closed contact, ES is an emergency stop button, U1A is a voltage comparator, Q1 is an NPN transistor, K2 is a normally closed relay, C1 is a filter capacitor, and KA1 is a pressure relay. Detailed Implementation

[0020] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0021] The features and performance of this utility model will be further described in detail below with reference to embodiments. Example 1 like Figure 1 As shown, a thermostatic exhaust recovery electronic control device for T-tube contrast agents includes a thermostat, a bubble detector, a fluid actuator, a flow path selector, and an emergency brake. The thermostat includes a temperature sensor and a first relay. The output of the temperature sensor is connected to the coil of the first relay, and the contacts of the first relay are connected in series with a heating element. The signal output of the bubble detector is connected to a status indicator. The control input of the fluid actuator is connected to a manual direction switch, and the power output is connected to a peristaltic pump motor. The control input of the flow path selector is connected to multiple manual selection buttons, and the output is connected to a solenoid valve. The emergency brake is connected in series in the common power supply circuit of the fluid actuator and the flow path selector.

[0022] A temperature sensor converts the detected contrast agent temperature signal into an electrical signal and outputs it to the coil of the first relay. The opening and closing of the first relay contacts controls the operation of the heating element, thereby maintaining a constant contrast agent temperature. During contrast agent delivery, a bubble detector monitors the flow path in real time and provides visual cues of the presence or absence of bubbles through a status indicator. Operators can manually control the forward and reverse rotation of the peristaltic pump motor via a directional switch to perform injection or aspiration, and simultaneously control the solenoid valves via different manual selection buttons to switch the flow path to different functional states such as injection, venting, or recovery. An emergency brake, as a primary safety feature, can be manually triggered in any abnormal situation. By cutting off the common power supply to the fluid actuator and flow path selector, it immediately stops the peristaltic pump and solenoid valves.

[0023] The technical solution presented in this embodiment realizes an integrated and modular hardware control architecture. It integrates key functions in contrast agent pretreatment and infusion process control, such as temperature maintenance, bubble monitoring, flow direction and path selection, into a single dedicated hardware module, and establishes an independent manual emergency braking channel. This infrastructure provides a clear integration basis for more refined safety protection functions (such as over-temperature and over-pressure protection) in subsequent embodiments, offering a hardware-based solution for improving operational consistency and enhancing the reliability of manual control at the system level.

[0024] Example 2 Based on Example 1, this example provides a specific hardware implementation method.

[0025] like Figure 2 As shown, the temperature sensor consists of a voltage divider circuit formed by a negative temperature coefficient (NTC) thermistor RT1 and a first fixed resistor R1 connected in series, connected between a +5V power supply (VCC1) and ground. The voltage divider point is node A. The first relay K1 is a double threshold relay, and its coil is connected between node A and ground. One end of the heating element EH (such as an electric heating film) is connected to a +24V power supply (VCC2), and the other end is grounded through the normally open contact of the first relay K1.

[0026] The bubble detector uses a through-beam infrared photoelectric sensor U2. The anode of its emitter is connected to a +5V power supply (VCC1) via a current-limiting resistor R3, while the cathode is directly grounded. Its receiver is an NPN phototransistor, with its emitter directly grounded and its collector connected to the +5V power supply (VCC1) via a pull-up resistor R5. The collector of the receiver also serves as the signal output terminal, connected to circuit node D. The status indicator consists of a light-emitting diode (LED) D1 connected in series with a current-limiting resistor R4. The specific connection is as follows: the anode of LED D1 is connected to node D, the cathode of LED D1 is connected to one end of the current-limiting resistor R4, and the other end of the current-limiting resistor R4 is grounded.

[0027] The fluid actuator consists of a manual direction switch and a DC motor M. The manual direction switch comprises a mechanically interlocked forward switch S1 and a reverse switch S2. The common terminals of S1 and S2 are both connected to the common power supply node B of the device. The free terminal of S1 is connected to the forward control terminal of the DC motor M, and the free terminal of S2 is connected to the reverse control terminal of the motor M. The common terminal of the motor M is grounded. The DC motor M is a peristaltic pump motor.

[0028] The flow path selector consists of three manual selection buttons and a three-position five-way dual-control solenoid valve. The three-position five-way dual-control solenoid valve has a first solenoid coil YV1 and a second solenoid coil YV2, and has three operating positions: left, middle, and right, corresponding to injection, venting, and recovery flow path states, respectively. The three manual selection buttons include a parallel instantaneous injection button SB1, a venting button SB2, and a recovery button SB3. One end of the injection button SB1 is connected to a common power supply node B, and the other end is connected to one end of the first solenoid coil YV1. One end of the recovery button SB3 is connected to the common power supply node B, and the other end is connected to one end of the second solenoid coil YV2. The other ends of the first solenoid coil YV1 and the second solenoid coil YV2 are grounded together. The venting button SB2 is connected to a reset control circuit. The reset control circuit includes a reset relay K3, one end of the coil of which is connected to the common power supply node B, and the other end is connected to one end of the normally open contact of the venting button SB2, the other end of which is grounded. The reset relay K3 has a first normally closed contact K3-1 and a second normally closed contact K3-2. The first normally closed contact K3-1 is connected in series in the connection line between the injection button SB1 and the first electromagnetic coil YV1. The second normally closed contact K3-2 is connected in series in the connection line between the recharge button SB3 and the second electromagnetic coil YV2.

[0029] The emergency brake uses a normally closed emergency stop button ES. The DC +24V power supply (VCC2) passes through the emergency stop button ES to form the common power supply node B, thereby powering the fluid actuator (motor M) and the flow path selector (solenoid valve YV).

[0030] After the system is powered on, the thermostat starts working: temperature sensors (RT1, R1) monitor the temperature in real time and convert it into voltage at node A. When the temperature is lower than the set value, causing the voltage at node A to be higher than the activation threshold of the first relay K1, the K1 coil is energized, its normally open contact closes, and the heating element EH is energized to heat; when the temperature rises to the point where the voltage at node A is lower than the release threshold of K1, the K1 coil is de-energized, the contact opens, and EH stops heating, thus achieving automatic temperature control.

[0031] During fluid transfer, the bubble detector continuously monitors the flow path: when there are no bubbles, the infrared light shines directly on the sensor U2 receiver tube, the node D is at a low level, and the indicator light D1 is off; when a bubble passes through and blocks the infrared light, the U2 receiver tube is cut off, the node D is pulled up to a high level, D1 lights up, and a visual alarm is issued.

[0032] During operation, the user selects the direction of motor M by manually switching the direction: pressing S1 connects the power supply to node B, which is the forward rotation end of the motor, driving the peristaltic pump to inject the contrast agent; pressing S2 connects the reverse rotation end, which drives the pump to perform suction.

[0033] At the same time, select the flow path using the flow path selection button: When the injection button SB1 is pressed, the power supply of node B is sent to the first electromagnetic coil YV1 through SB1 and the first normally closed contact K3-1 of the reset relay K3. YV1 is energized and drives the three-position five-way dual-control solenoid valve to switch to the left position, realizing the opening of the injection flow path. When the recycling button SB3 is pressed, the power supply of node B is sent to the second electromagnetic coil YV2 through SB3 and the second normally closed contact K3-2 of the reset relay K3. YV2 is energized and drives the valve to switch to the right position, realizing the opening of the recycling flow path. When the exhaust button SB2 is pressed, the power supply of node B is sent to the coil of the reset relay K3 through SB2. K3 is energized and its first normally closed contact K3-1 and second normally closed contact K3-2 open simultaneously, thereby cutting off the power supply circuit of the first electromagnetic coil YV1 and the second electromagnetic coil YV2. The valve core is reset to the neutral position under the action of the internal spring, realizing the conduction of the exhaust flow path.

[0034] In the event of any emergency during the process, pressing the emergency stop button ES will immediately cut off the power supply to the common power supply node B, causing the motor M and solenoid valve YV to lose power simultaneously, the peristaltic pump to stop running, the flow path switching to be interrupted, and the system to enter a braking state.

[0035] This embodiment provides a specific pure hardware circuit scheme to materialize the system architecture of Embodiment 1. It demonstrates how to construct a dedicated device with automatic temperature control, real-time bubble monitoring and indication, and manual fluid drive and flow path selection functions using discrete components (such as thermistors, dual-threshold relays, infrared sensors, mechanical switches, and emergency stop buttons) and basic analog / logic circuits. This implementation eliminates dependence on general-purpose processors and system software, making the response delay of core control functions deterministic and the behavior predictable. Therefore, it provides a feasible fundamental technical path from the hardware level to improve the operational reliability and timing controllability of the contrast agent processing stage in T-tube angiography.

[0036] Example 3 Based on Example 2, this example adds a hardware over-temperature protector independent of the thermostat as a redundant safety backup.

[0037] like Figure 3As shown, the protector includes a voltage comparator U1A as a comparison unit. Its non-inverting input (sampling terminal) is directly connected to the output node A of the temperature sensor to monitor the same temperature. Its inverting input (reference terminal) is connected to a fixed reference voltage generated by a precision voltage reference source, which is a TL431 type reference source. Specifically, the current-limiting resistor R6 is connected to a +5V power supply (VCC1) at one end and to the cathode of the TL431 at the other end. The anode of the TL431 is directly connected to the common ground (GND) of the circuit. A first voltage divider resistor R7 is connected to the cathode of the TL431 at one end and to the reference terminal of the TL431 at the other end. A second voltage divider resistor R8 is connected to the reference terminal of the TL431 at one end and to the common ground (GND) of the circuit at the other end. A filter capacitor C1 is connected to the reference terminal of the TL431 at one end and to the common ground (GND) of the circuit at the other end. The cathode of the TL431 also serves as the reference voltage output terminal, connected to the inverting input (i.e., the reference terminal) of the voltage comparator U1A. The output of voltage comparator U1A drives a normally closed relay K2, which acts as an execution relay, through an NPN transistor Q1, which serves as a switching unit. Specifically, the output of U1A is connected to the base of Q1 via a current-limiting resistor R2. The emitter of Q1 is grounded, and its collector is connected to one end of the K2 coil. The other end of the K2 coil is connected to a +5V power supply (VCC1). The normally closed contact of the normally closed relay K2 serves as the final execution output and is connected in series in the total power input circuit of the heating element EH. Specifically, based on the connection relationship described in Example 2, the terminal of the heating element EH originally connected to the +24V power supply (VCC2) is changed to be connected to one end of the normally closed contact of K2, while the other end of the normally closed contact of K2 is connected to the +24V power supply (VCC2).

[0038] When the system is operating normally, the voltage at node A (corresponding to the controlled temperature) is lower than the safety limit threshold set by the reference voltage. At this time, the voltage comparator U1A outputs a low level, the transistor Q1 is cut off, the coil of the relay K2 is not energized, its normally closed contact remains closed, the power supply path of the heating element EH is not affected, and the thermostat independently performs the normal thermostat control function.

[0039] When a fault occurs in the thermostat (such as the first relay K1 contact sticking and failing to disconnect), causing a runaway temperature rise, the voltage at node A increases accordingly. Once this voltage exceeds the safety limit threshold set by the hardware over-temperature protector, the output of voltage comparator U1A immediately flips to a high level, driving transistor Q1 to saturate and conduct. This energizes the coil of relay K2, forcibly opening its normally closed contact, thus physically and completely cutting off the total power supply (VCC2) to the heating element EH, regardless of the state of the first relay K1. This protection action is hardware-based, final, and not automatically reset (reset after manual troubleshooting), thus achieving independent over-temperature protection.

[0040] The hardware over-temperature protector described in this embodiment provides a parallel and independent pure hardware safety monitoring and execution link for the constant temperature control function. By sampling the same temperature signal but using independent comparison benchmarks and actuators, it constructs a hardware barrier against potential failures of the constant temperature controller (such as contact adhesion). Its design ensures that even in the extreme case of unexpected failure of the core temperature control logic, the system can still completely cut off the heating power before the temperature exceeds the safe upper limit through deterministic hardware action, thereby controlling the over-temperature risk at the hardware level. The introduction of this redundant safety mechanism aims to alleviate the reliability limitations that a single control system may bring from a design perspective, providing a concrete hardware implementation scheme for improving the thermal safety margin of the entire device in continuous operation scenarios.

[0041] Example 4 This embodiment, based on the system connection relationship shown in any of the above embodiments, further adds a pressure protection function based on electrical signals to prevent the risk of excessive pressure in the fluid pipeline.

[0042] like Figure 4 As shown, the circuit architecture of the electronic control device of this utility model includes a pressure protector. This protector has a pressure status signal input terminal, which in this embodiment is specifically a pressure relay (KA1) serving as a shut-off actuator. The pressure relay KA1 is an independent pressure switch with a preset operating threshold. In use, its pressure sensing portion must be fluidly connected to the contrast agent delivery pipeline so that it can output a corresponding on / off electrical signal (i.e., the open / closed state of its normally closed contacts) based on whether the pipeline pressure exceeds the limit.

[0043] From the circuit connection perspective, the pressure status signal input terminal (i.e., the normally closed contact of KA1) is connected in series to the power supply main circuit of the electronic control device. Specifically, it is connected between the output terminal of the +24V power supply (VCC2) that powers the fluid actuator and the flow path selector, and the input terminal of the emergency brake (normally closed emergency stop button ES). This means that the power supply path of the peristaltic pump motor M and the three-way solenoid valve YV is simultaneously controlled by the parallel connection of the manual emergency stop button ES and the pressure status signal (KA1).

[0044] Within the normal operating pressure range of the device, the external pipeline pressure does not exceed the limit, the normally closed contact of KA1 remains closed, the pressure status signal input terminal is in the conducting state, and the power supply VCC2 is unobstructed.

[0045] When the fluid pipeline pressure rises abnormally and exceeds the set threshold of KA1, the electrical signal from the external pressure sensing component changes—the normally closed contact of KA1 is forcibly opened due to mechanical action. This control effect is equivalent to triggering an emergency brake, forcibly cutting off all power to the peristaltic pump motor (M) and the flow path selection solenoid valve (YV), causing all active fluid operations to stop immediately.

[0046] This embodiment, by integrating the pressure relay (KA1), adds an independent and direct overpressure safety barrier to the device at the pure hardware level. Those skilled in the art will understand that other hardware equivalents (e.g., circuits using a pressure switch or a combination of a pressure sensor and a relay) that achieve the same "pressure sensing-circuit shutdown" protection function are also within the scope of this invention. This further improves the device's multi-layered safety protection system.

[0047] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A thermostatic exhaust recovery electronic control device for T-tube contrast agents, characterized in that, The device includes a thermostat, a bubble detector, a fluid actuator, a flow path selector, and an emergency brake. The thermostat includes a temperature sensor and a first relay (K1). The output of the temperature sensor is connected to the coil of the first relay (K1), and the contacts of the first relay (K1) are connected in series with a heating element (EH). The signal output of the bubble detector is connected to a status indicator. The control input of the fluid actuator is connected to a manual direction switch, and its power output is connected to a peristaltic pump motor. The control input of the flow path selector is connected to multiple manual selection buttons, and its output is connected to a solenoid valve. The emergency brake is connected in series in the common power supply circuit of the fluid actuator and the flow path selector.

2. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 1, characterized in that, The temperature sensor is a voltage divider circuit consisting of a negative temperature coefficient thermistor (RT1) and a first fixed resistor (R1) connected in series; the first relay (K1) is a double threshold relay, and its coil is connected to the output terminal of the voltage divider circuit.

3. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 2, characterized in that, It also includes a hardware over-temperature protector that is independent of the thermostat; The hardware over-temperature protector includes a comparison unit and an execution relay; the sampling terminal of the comparison unit is connected to the output terminal of the temperature sensor, the reference terminal is connected to a reference voltage, and its output terminal controls the coil of the execution relay through a switching unit; the normally closed contact of the execution relay is connected in series in the total power input circuit of the heating element.

4. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 3, characterized in that, The comparison unit is a voltage comparator (U1A); the switching unit is a transistor (Q1); and the execution relay is a normally closed relay (K2).

5. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 1, characterized in that, The bubble detector is a through-beam infrared photoelectric sensor (U2); the status indication component is a series circuit of a light-emitting diode and a current-limiting resistor connected to the output terminal of the infrared photoelectric sensor receiver tube.

6. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 1, characterized in that, The solenoid valve is a three-position five-way dual-control solenoid valve, which includes a first solenoid coil and a second solenoid coil.

7. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 6, characterized in that, The manual direction switch includes an interlocked forward switch (S1) and a reverse switch (S2); the plurality of manual selection buttons include an injection button (SB1), an exhaust button (SB2), and a regeneration button (SB3).

8. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 7, characterized in that, The flow path selector also includes a reset control circuit, which includes a reset relay (K3). When the exhaust button (SB2) is operated, the coil of the reset relay (K3) is energized. At least one pair of normally closed contacts (K3-1, K3-2) of the reset relay (K3) are respectively connected in series in the circuit between the injection button (SB1) and the first electromagnetic coil (YV1) of the solenoid valve, and in the circuit between the recovery button (SB3) and the second electromagnetic coil (YV2) of the solenoid valve.

9. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 1, characterized in that, The emergency brake is a normally closed emergency stop button (ES).

10. The isothermal exhaust recovery electronic control device for T-tube contrast agents according to claim 1, characterized in that, It also includes a pressure protector, whose protective contacts are connected in series in the common power supply circuit.

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