Ultrasonic medical probe disinfection device

Abstract

The invention discloses an ultrasonic medical probe disinfection device, which relates to the technical field of disinfection devices, and is characterized by comprising a clamping structure, a moving structure, a disinfection container and a control unit. The clamping structure is provided with an adjustable clamping arm, an elastic buffer layer and a pressure sensor, and ultrasonic probes of different sizes can be fixed in a self-adaptive mode; the moving structure drives a sliding rod to vertically move along a sliding rail through a stepping motor, so that accurate lifting of the probe is realized; the disinfection container is provided with a water inlet, a water outlet and a liquid level sensor, and is matched with the water tank and the electromagnetic valve to realize automatic liquid level maintenance and waste liquid discharge; the control unit integrates various sensors and a control panel, supports a user to set disinfection parameters and realizes full-process automatic control. The device has the advantages of being high in universality, convenient to operate, thorough in disinfection and the like, and is suitable for efficient disinfection of the ultrasonic probe in a medical environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disinfection devices, in particular to an ultrasonic medical probe disinfection device. BACKGROUND

[0002] The ultrasonic medical probe is an indispensable imaging tool in clinical diagnosis, which directly contacts the skin or mucosa of the patient during use and has become one of the important potential media for cross-infection in hospitals. Therefore, thorough and efficient disinfection of its surface after use is a key link in infection control. At present, the disinfection methods for ultrasonic probes mainly include two types: manual disinfection and simple equipment disinfection. Manual disinfection usually uses cotton balls or gauze dipped with disinfectant (such as ethanol, isopropanol, etc.) for wiping. Although this method is simple to operate, it has significant drawbacks: first, the disinfection effect is highly dependent on the responsibility and standardization of the operator, and the wiping force, path and time cannot be standardized, which can easily leave disinfection blind spots, resulting in incomplete disinfection; second, frequent mechanical wiping can easily damage the acoustic lens film on the surface of the probe, shortening the service life of the probe; third, during the peak period of diagnosis and treatment, the efficiency of manual disinfection is low, which is difficult to meet the needs of continuous use.

[0003] In order to solve the above problems, a medical ultrasonic probe convenient cleaning and disinfection device is disclosed in Chinese patent (patent publication number: CN119500670B), which includes a cleaning box, a fixed support column is vertically installed on the side of the cleaning box, a lifting frame is lifted and controlled on the fixed support column through a lifting mechanism, a rotating disc is arranged inside the lifting frame, a rotating drive mechanism is matched arranged on the rotating disc, a plurality of rotating support shafts are evenly distributed around the center of the rotating disc and arranged on the top of the rotating disc, the lower end of the rotating support shaft is rotatably connected with the rotating disc, a positioning and clamping structure is arranged on the rotating support shaft, a synchronous rotating mechanism is matched arranged between the rotating support shaft and the rotating disc, a filter screen is arranged at the bottom of the lifting frame, and an elastic vibration mechanism is matched arranged between the rotating disc and the filter screen.

[0004] The above-mentioned scheme can realize multi-angle cleaning of the ultrasonic probe, and has impact cleaning effect, high cleaning efficiency, and can effectively avoid incomplete cleaning problem, and can also perform vibration cleaning operation; but the cleaning and disinfection device still has some defects: first, the existing part of the ultrasonic probe disinfection device usually cannot be compatible with multiple types and sizes of ultrasonic probes for self-adaptive adjustment and disinfection, and it is difficult to meet the disinfection needs of different probes. SUMMARY

[0005] The purpose of the present application is to solve the above problems, and to provide an ultrasonic medical probe disinfection device to solve the problems of poor universality of the disinfection device in the prior art, inability to self-adaptively clamp probes of different sizes, lack of precise automatic immersion control, and lack of liquid level maintenance and waste liquid treatment functions.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows: an ultrasonic medical probe disinfection device, comprising a clamping structure, a moving structure, a disinfection container and a control unit; the clamping structure is used for fixing the ultrasonic medical probe and has an adjustable clamping arm, an elastic buffer layer and a pressure sensor, the elastic buffer layer is arranged on the inner side of the clamping arm; the moving structure is used for driving the clamping structure to move vertically and comprises an L-shaped fixed arm, a sliding rod, a stepping motor and a vertically arranged sliding rail, the stepping motor is fixed to the top of the disinfection container along the sliding rail, the sliding rod is connected with the stepping motor through a shaft coupling, one end of the fixed arm is connected with the sliding rod, and the other end is connected with the clamping structure; the disinfection container is used for containing disinfectant and is provided with a water inlet, a drain and a liquid level sensor, the water inlet is connected with a water tank, and an electromagnetic drain valve is arranged at the drain; the control unit is electrically connected with the pressure sensor of the clamping structure, the stepping motor of the moving structure, the liquid level sensor and the electromagnetic drain valve of the disinfection container respectively, is used for receiving the feedback signal of the sensor and controlling the action of each executing component, so as to realize the self-adaptive clamping of the probe, the precise immersion disinfection and the liquid level maintenance.

[0007] Further, the clamping structure further comprises a probe placing area, the probe placing area is a concave groove and is arranged at the bottom of the clamping structure, the surface of the concave groove is covered with soft anti-skid material, and a wire groove for fixing the power cord of the probe is reserved in the groove.

[0008] Further, the clamping arm of the clamping structure is integrated with an electromagnetic locker at the root, and the electromagnetic locker is electrically connected with the control unit; when the pressure sensor detects that the clamping force of the clamping arm on the probe reaches a preset threshold value, the control unit triggers the electromagnetic locker to be energized and attracted to lock the opening and closing state of the clamping arm.

[0009] Further, the fixed arm and the clamping structure are connected through a connecting shaft, the connecting shaft supports the quick disassembly of the clamping structure and the fixed arm, and allows the clamping structure to be adjusted by ±15° of the inclination angle around the connecting shaft.

[0010] Further, the clamping structure further comprises an adjusting knob, the adjusting knob is arranged at the top of the clamping structure and is connected with the clamping arm through a worm gear transmission structure; rotating the adjusting knob can drive the clamping arm to open and close in the horizontal direction, and the maximum opening and closing distance of the clamping arm is 80mm, so as to adapt to ultrasonic medical probes of different sizes.

[0011] Further, the water inlet of the disinfection container is provided with a water inlet valve, and the water inlet valve is electrically connected with the control unit; the water tank is fixed to the side of the disinfection container, and a liquid level sensor for monitoring the water storage capacity is arranged in the water tank; when the liquid level in the water tank is lower than a preset threshold value, the control unit triggers the water inlet valve to open to supplement the disinfectant.

[0012] Further, the surface of the stepper motor is provided with an infrared distance sensor, the emitting end of the infrared distance sensor faces downward and is located opposite the probe placement area of the clamping structure, and the infrared distance sensor is electrically connected with the control unit; the infrared distance sensor is used for detecting the vertical distance between the probe and the liquid level of the disinfectant in real time, and transmitting the distance signal to the control unit, and the control unit adjusts the rotating speed of the stepper motor according to the signal to control the immersion depth of the probe.

[0013] Further, the control unit further comprises a control panel, the control panel is fixed to the top of the water tank, and the control panel is integrated with a start button, a pause button, a mode selection button and a display screen; the disinfection time and the liquid level threshold of the disinfectant can be set through the control panel, and the'standard mode' or 'fast mode' disinfection mode can be selected.

[0014] Further, the stroke of the sliding rod covers the maximum depth of the disinfectant in the disinfecting container, when the control unit receives the disinfection start instruction, the stepper motor drives the sliding rod to move vertically downward along the slide rail to drive the probe to immerse into the disinfectant at a constant speed, when the disinfection is completed, the stepper motor reverses to drive the sliding rod to lift the probe to the initial position along the slide rail.

[0015] Further, the electromagnetic lock comprises a ring-shaped electromagnet and a ferro-nickel alloy lock tongue, when the electromagnetic lock is powered on, the ring-shaped electromagnet attracts the ferro-nickel alloy lock tongue, so that the lock tongue is embedded into the lock hole at the root of the clamping arm; when the disinfection is completed, the control unit triggers the electromagnetic lock to be powered off, and the ferro-nickel alloy lock tongue is retracted under the action of the spring to release the locking of the clamping arm.

[0016] Compared with the prior art, the beneficial effects of the present application are: the clamping structure of the present application can drive the clamping arm to realize horizontal opening and closing with a maximum interval of 80mm through the top adjusting knob and the worm gear transmission structure, and can adaptively fix ultrasonic probes of different models and sizes; meanwhile, the inside of the clamping arm is provided with a silica gel elastic buffer layer, and the bottom concave probe placement area is covered with soft anti-skid material, which not only avoids damage to the acoustic lens film of the probe caused by manual mechanical wiping, but also prevents the probe from being scratched during clamping; and the pressure sensor and the electromagnetic lock are linked, and the clamping arm is automatically locked when the clamping force meets the standard, solving the problem of unstable manual fixing and the lack of self-adaptive locking in existing devices.

[0017] The stepper motor of the moving structure drives the sliding rod to move vertically along the slide rail through the shaft coupling, and the infrared distance sensor on the surface of the stepper motor detects the distance between the probe and the liquid level and the liquid level sensor of the disinfecting container in real time, and the control unit can dynamically adjust the rotating speed of the motor to ensure that the probe is completely immersed and the immersion depth meets the set requirements, completely avoiding the disinfection blind area; meanwhile, the fixed arm and the clamping structure are supported by the connecting shaft to adjust the inclination angle of ±15°, which can adapt to the liquid inlet angle requirements of different disinfection scenes.

[0018] The water tank connected with the disinfection container of the application is provided with a liquid level sensor, when the disinfection liquid level is lower than the threshold value, the control unit automatically triggers the water inlet valve to add water, ensuring the stability of the liquid level during the whole disinfection process; after the disinfection is completed, the electromagnetic drain valve at the bottom of the container is automatically opened to drain the waste liquid, without manual intervention; and the control unit integrates the control panel, supports the selection of "standard mode" and "fast mode", and the parameter setting of disinfection time, liquid level threshold and the like, realizes the full-process automation from probe clamping, accurate immersion to waste liquid discharge, greatly shortens the single disinfection time, and is especially suitable for continuous use during the peak period of diagnosis and treatment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure schematic diagram in the embodiment of the application;

[0020] Figure 2 is the front view structure schematic diagram in the embodiment of the application;

[0021] Figure 3 is the top view structure schematic diagram in the embodiment of the application;

[0022] Figure 4 is the connection schematic diagram of the clamping structure and the moving mechanism in the embodiment of the application;

[0023] Figure 5 is the enlarged schematic diagram of the clamping structure in the embodiment of the application;

[0024] Figure 6 is the overall device working flow chart in the embodiment of the application.

[0025] In the figure: 1, clamping structure; 101, adjustment knob; 102, clamping arm; 103, electromagnetic locker; 104, probe placement area; 105, connecting shaft; 2, moving structure; 201, fixed arm; 202, sliding rod; 203, stepping motor; 204, sliding rail; 3, disinfection container; 301, water inlet; 302, drain outlet; 303, liquid level sensor; 4, control unit; 5, water tank; 6, infrared distance measuring sensor. DETAILED DESCRIPTION

[0026] In order to enable the personnel in the art to better understand the present application scheme, the technical scheme of the present application will be further described in detail below in combination with the embodiments of the present application and the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below in combination with the embodiments.

[0028] Example: Figures 1-5 As shown, an ultrasound medical probe disinfection device includes a clamping structure 1, a moving structure 2, a disinfection container 3, and a control unit 4.

[0029] The clamping structure 1 is used to fix the ultrasound medical probe and has an adjustable clamping arm 102 and an electromagnetic locking function. The clamping structure 1 is the core fixing component, consisting of an adjustment knob 101, a clamping arm 102, a connecting shaft 105, an electromagnetic lock 103, the probe clamping structure 1, and a probe placement area 104. It is connected to the fixing arm 201 of the moving structure 2 via the connecting shaft 105. The adjustment knob 101 is located at the top of the clamping structure 1; manual rotation drives the clamping arm 102 to open and close, allowing for the installation of probes of different sizes. The inner side of the 02 is provided with an elastic buffer layer, which is preferably silicone in this embodiment to avoid scratching the probe. An electromagnetic lock 103 is integrated at its root. After being clamped in place, it is locked by electromagnetic attraction to prevent it from falling off. The probe placement area 104 is a concave groove located at the bottom of the clamping structure 1. The surface is covered with soft anti-slip material. A wire groove is reserved in the groove for fixing the probe power cord. The two ends of the connecting shaft 105 are respectively connected to the fixed arm 201 and the clamping arm 102 of the moving structure 2, which supports quick disassembly and ±15° tilt angle fine adjustment, making it easy to pick up and put down the probe.

[0030] The moving structure 2 achieves precise vertical movement of the probe via a stepper motor 203 and a slide rail 204. The moving structure 2 consists of a fixed arm 201, a sliding rod 202, a stepper motor 203, and a slide rail 204, responsible for driving the probe to move precisely up and down. The fixed arm 201 is an L-shaped frame structure; one horizontal section is connected to the sliding rod 202 via bolts, and the other horizontal section is detachably connected to the clamping structure 1 via a connecting shaft 105. The stepper motor 203 slides vertically along the slide rail 204, fixed to the top reinforcing rib of the disinfection container 3. The stepper motor 203 is sleeved on the sliding rod 202; upon receiving control commands, it drives the sliding rod 202 to move up and down along the slide rail 204. The inner wall of the sliding rod 202 is connected to the output shaft of the stepper motor 203 via a coupling, and its stroke covers the depth of the disinfectant solution, thereby immersing or lifting the probe into or out of the disinfectant solution.

[0031] The disinfection container 3 is used for containing disinfectant liquid, has a water inlet 301, a water outlet 302 and a liquid level monitoring function; the disinfection container 3 is a lower part of the main body structure of the device, comprising a disinfectant liquid storage cavity, a water inlet and outlet system and a liquid level / distance detection unit. The container body is a square container with an open top, the bottom is provided with a water outlet 302 connected with an electromagnetic drain valve, the side wall is provided with a water inlet 301 connected with a water supply pipe of the water tank 5, the water tank 5 is located on the side of the container, and a liquid level sensor 303 is built-in to monitor the water storage capacity, so as to ensure sufficient disinfectant liquid. The top of the container is reserved for installation at the connection with the fixed arm 201, and the slide rail 204 and the stepping motor 203 are fixed thereon; the surface of the stepping motor 203 is mounted with an infrared distance measuring sensor 6, the emitting end of which faces downward and is opposite to the probe placement area 104, which is used for real-time detection of the vertical distance between the probe and the liquid surface.

[0032] The control unit 4 integrates infrared distance measurement, pressure feedback and liquid level sensor 303 to realize automatic control; the control and interaction system is composed of a control panel, an electromagnetic locking controller and a sensor network to realize full-process automatic control. The control panel is located on the top of the water tank 5 and integrates operation buttons such as start, pause and mode selection and a display screen, and users can set parameters such as disinfection time and liquid level threshold through the control panel; the electromagnetic lock 103 is located at the bottom of the clamping arm 102, and the inside of the clamping arm 102 is embedded with a pressure sensing element triggered by the control unit 4 according to the pressure sensor feedback - when the clamping force reaches the standard, the electromagnet is energized to attract the lock tongue to lock the clamping arm 102; the sensor network includes:

[0033] ①The infrared distance measuring sensor 6 feeds back the distance between the probe and the liquid surface in real time, which assists the stepping motor 203 to adjust the lifting speed;

[0034] ②The liquid level sensor 303 monitors the liquid level of the disinfectant liquid, and triggers the water inlet valve of the water tank 5 to supplement water when the liquid level is below the threshold;

[0035] ③The pressure sensor transmits clamping force data to the control unit 4 in real time to ensure stable clamping force. Each sensor is connected with the control unit 4 through a line to form a closed loop control link, which ensures the accuracy and safety of the disinfection process.

[0036] Workflow: The user first removes the independent probe clamping structure through the connecting shaft, which is hinged to the fixed arm through the connecting shaft, supporting rapid separation for operation. After removal, the user rotates the adjustment knob to drive the clamping arm pair of openable and closable structures to expand horizontally through the worm gear drive until the opening distance is adapted to the size of the probe to be disinfected (the maximum openable and closable distance is 80mm). Then place the probe in the concave probe placement area at the bottom of the clamping structure, which is covered with soft anti-slip material, and the groove wall wire groove is used to fix the probe power cord to avoid pulling during subsequent operation. After the probe is placed in position, the elastic buffer layer inside the clamping arm automatically adheres to the surface of the probe, and when the clamping force reaches the threshold value detected by the built-in pressure sensor, the control unit triggers the electromagnetic lock to be energized. The ring-shaped electromagnet attracts the iron-nickel alloy lock tongue embedded in the lock hole at the root of the clamping arm, completing mechanical locking and ensuring that the probe does not fall off during movement. Finally, the user re-installs the locked clamping structure to the fixed arm through the connecting shaft, and at this time the fixed arm supports horizontal fine adjustment of the clamping structure through the connecting shaft to adapt to the liquid inlet angle requirements of different disinfection scenarios.

[0037] The user selects "standard mode" or "fast mode" disinfection mode through the right control panel and starts the program, and the control unit drives the stepper motor to operate. The motor output shaft drives the built-in screw rod to rotate through the shaft coupling, driving the sliding rod to move vertically downward along the straight slide rail, and bringing the probe to immerse uniformly into the disinfectant in the disinfectant container. During the falling process, the infrared distance measuring sensor at the top of the container monitors the vertical distance between the probe and the liquid surface in real time, and cooperates with the liquid level data feedback by the liquid level sensor on the inner wall of the container. The control unit adjusts the rotation speed of the stepper motor to ensure that the probe is completely immersed and the immersion depth meets the set requirements. After disinfection is completed, the stepper motor operates in reverse to drive the sliding rod to lift the probe to the initial position. At this time, the control unit triggers the electromagnetic lock to be de-energized, and the lock tongue is retracted under the action of the spring. The user can take out the disinfected probe from the probe placement area by rotating the adjustment knob or directly removing the clamping structure. If the liquid level is lower than the threshold value during disinfection, the control unit will trigger the water inlet valve of the water tank to supplement water at the same time to ensure the stability of the liquid level; after disinfection is completed, the electromagnetic drain valve at the center drain outlet at the bottom of the container is opened to drain the waste liquid, completing the single disinfection process.

[0038] The above specific embodiments are only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An ultrasonic medical probe disinfecting device, characterized by: The application relates to a medical ultrasonic probe automatic disinfection device, which comprises a clamping structure (1), a moving structure (2), a disinfection container (3) and a control unit (4); the clamping structure (1) is used for fixing an ultrasonic medical probe and is provided with an adjustable clamping arm (102), an elastic buffer layer and a pressure sensor, the elastic buffer layer is arranged on the inner side of the clamping arm (102); the moving structure (2) is used for driving the clamping structure (1) to move vertically and comprises an L-shaped fixing arm (201), a sliding rod (202), a stepping motor (203) and a vertically arranged sliding rail (204), the stepping motor (203) is fixed to the top of the disinfection container (3) along the sliding rail (204), the sliding rod (202) is connected with the stepping motor (203) through a shaft coupling, one end of the fixing arm (201) is connected with the sliding rod (202), and the other end is connected with the clamping structure (1); the disinfection container (3) is used for containing disinfectant and is provided with a water inlet (301), a drainage outlet (302) and a liquid level sensor (303), the water inlet (301) is connected with a water tank (5), and an electromagnetic drainage valve is arranged at the drainage outlet (302); the control unit (4) is electrically connected with the pressure sensor of the clamping structure (1), the stepping motor (203) of the moving structure (2), the liquid level sensor (303) of the disinfection container (3) and the electromagnetic drainage valve, respectively, is used for receiving sensor feedback signals and controlling the actions of various executing components, so that the self-adaptive clamping of the probe, the accurate immersion disinfection of the probe and the liquid level maintenance are realized.

2. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The clamping structure (1) further comprises a probe placing area (104), the probe placing area (104) is a concave groove and is arranged at the bottom of the clamping structure (1), the surface of the concave groove is covered with soft anti-skid material, and a wire groove for fixing a probe power cord is reserved in the groove.

3. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: An electromagnetic locker (103) is integrated at the root of the clamping arm (102) of the clamping structure (1), and the electromagnetic locker (103) is electrically connected with the control unit (4); when the pressure sensor detects that the clamping force of the clamping arm (102) on the probe reaches a preset threshold value, the control unit (4) triggers the electromagnetic locker (103) to be energized and attracted, so as to lock the opening and closing state of the clamping arm (102).

4. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The fixing arm (201) is connected with the clamping structure (1) through a connecting shaft (105), the connecting shaft (105) supports the quick disassembly of the clamping structure (1) and the fixing arm (201), and allows the clamping structure (1) to be adjusted by a tilt angle of + / -15 degrees around the connecting shaft (105).

5. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The clamping structure (1) further comprises an adjusting knob (101), the adjusting knob (101) is arranged at the top of the clamping structure (1) and is connected with the clamping arm (102) through a worm gear transmission structure; rotating the adjusting knob (101) can drive the clamping arm (102) to open and close along the horizontal direction, and the maximum opening and closing distance of the clamping arm (102) is 80mm, so as to adapt to ultrasonic medical probes of different sizes.

6. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The water inlet (301) of the disinfection container (3) is provided with a water inlet valve, and the water inlet valve is electrically connected with the control unit (4); the water tank (5) is fixed to the side of the disinfection container (3), and the water tank (5) is provided with a liquid level sensor (303) for monitoring the storage amount of water; when the liquid level in the water tank (5) is lower than a preset threshold, the control unit (4) triggers the water inlet valve to open to supplement the disinfectant.

7. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The surface of the stepping motor (203) is provided with an infrared distance sensor (6), the emitting end of the infrared distance sensor (6) faces downward and is placed opposite to the probe placement area (104) of the clamping structure (1), and the infrared distance sensor (6) is electrically connected with the control unit (4); the infrared distance sensor (6) is used for detecting the vertical distance between the probe and the liquid level of the disinfectant in real time, and transmitting the distance signal to the control unit (4); the control unit (4) adjusts the rotating speed of the stepping motor (203) according to the signal to control the immersion depth of the probe.

8. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The control unit (4) further comprises a control panel, the control panel is fixed to the top of the water tank (5), and the control panel is integrated with a start button, a pause button, a mode selection button and a display screen; the disinfection time and the disinfectant liquid level threshold can be set through the control panel, and two disinfection modes of "standard mode" and "fast mode" can be selected.

9. The ultrasonic medical probe disinfecting apparatus as claimed in claim 1, characterized in that: The stroke of the sliding rod (202) covers the maximum depth of the disinfectant in the disinfection container (3); when the control unit (4) receives a disinfection start instruction, the stepping motor (203) drives the sliding rod (202) to move vertically downward along the slide rail (204) to drive the probe to immerse into the disinfectant at a constant speed; when the disinfection is completed, the stepping motor (203) reverses to drive the sliding rod (202) to lift the probe to the initial position along the slide rail (204).

10. The ultrasonic medical probe disinfecting apparatus as claimed in claim 3, characterized in that: The electromagnetic lock (103) comprises a ring-shaped electromagnet and a ferro-nickel alloy lock tongue; when the electromagnetic lock (103) is powered on, the ring-shaped electromagnet attracts the ferro-nickel alloy lock tongue, so that the lock tongue is embedded into the lock hole at the root of the clamping arm (102); when the disinfection is completed, the control unit (4) triggers the electromagnetic lock (103) to be powered off, and the ferro-nickel alloy lock tongue is retracted under the action of the spring to release the locking of the clamping arm (102).

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