Medical device with shutdown function and method for triggering a shutdown signal therefor

Abstract

Medical device, comprising a control device (401), a motion sensor (402) with which a movement value can be determined, a position sensor (404) with which an angular position in space can be detected, a time measuring device (406) with which a time period can be determined, wherein the control device (401) is designed such that a switch-off signal can be generated if during the entire period the movement value falls below a threshold value and at the same time the position sensor (404) detects an inclination angle (207) relative to a storage plane which lies within a defined storage angle range, wherein the storage plane is a plane perpendicular to a vertical direction, wherein the amount of the defined storage angle range has a value between 5° and 10°.

Description

[0001] The invention relates to a medical device with a shutdown function and a method for triggering a shutdown signal for the medical device. A medical device is an electronic device used during an examination or surgery on a patient.

[0002] DE 10 2009 043 652 A1 discloses an endoscopic instrument with at least one component that heats up during operation of the instrument, with means for automatically detecting the use or non-use of the instrument and with a control which, when the instrument is not in use, controls the at least one component that heats up during operation of the instrument at a reduced power or switches it off and, when the instrument is in use, controls the at least one component that heats up during operation of the instrument at the power intended for use or switches it on.

[0003] EP 2 664 271 A1 discloses a video endoscope, with a light guide that can be supplied with illumination light from a light source, with an image recording system that has a lens system and an electrically supplied video chip, and with an acceleration sensor that detects movement or non-movement of the video endoscope and that, in the event of non-movement of the video endoscope, puts the light source and / or the electrical supply of the video chip at least into a low-energy standby mode, characterized in that a time measuring device is provided which, in the event of detected non-movement of the video endoscope, enables a switch to standby mode only after a specific measured period of time.

[0004] DE 10 2012 009 749 A1 discloses a method for switching a video endoscope on or off, characterized in that the acceleration sensor switches on the light source or the video signal after it registers a movement of the video scope, or switches off the light source or the video signal after it no longer registers any movement.

[0005] WO 2009 / 130 666 A1 discloses a laryngoscope comprising a handle, a light source carried by the handle, power supply means for supplying electrical energy to the light source, a blade carried by the handle and extending generally transversely to the handle, switch means operable to control the power supply to the light source, and actuating means for actuating the switch means, wherein the actuating means comprises sensor means for operatively detecting a body in a predetermined proximity thereto, whereupon the actuating means is operable to automatically actuate the switch means.

[0006] DE 10 2009 017 811 A1 discloses a device with a supply unit and an activation unit controlling the same, in particular a dental or medical camera, characterized in that it has a sensing unit which responds to an environmental parameter, that it comprises evaluation means which are supplied with the output signal of the sensing unit and then provide an output signal when the output signal of the sensing unit fulfills a predetermined criterion, and that the output signal of the evaluation means is connected to a control input of the supply unit.

[0007] In a surgical situation, medical devices may be used multiple times for a limited period of time and not needed between these periods. While the user, such as a surgeon, naturally activates a medical device or a function on that medical device before use, they sometimes forget to turn it off after use. It may happen that the device remains switched on when it is put down again.

[0008] This causes the medical device to heat up and consumes a lot of energy. It may be necessary to provide cooling measures for the device. If the medical device includes a light source, the light energy from the light, if directed at one location for an extended period, can cause thermal stress or damage to the illuminated area. For example, high light output can burn holes in sterile cloths, compromising the sterility of the device or, in the worst case, leading to a fire. If the device is powered by a battery or accumulator, its operating life will also be adversely reduced.

[0009] It is therefore an object of the invention to provide a medical device and a method which has improved energy management and which overcomes the above-mentioned disadvantages.

[0010] This object is achieved by a medical device having the features of independent claim 1. Advantageous developments of the invention are described in the subclaims. The object is further achieved by a method according to claim 9.

[0011] According to the invention, a medical device comprises a control device, a motion sensor with which a motion value can be determined, a position sensor with which an angular position in space can be detected, and a time measuring device with which a time period can be determined. The control device is designed such that a shutdown signal can be generated if the motion value falls below a threshold value during the entire time period and, at the same time, the position sensor detects an angle of inclination relative to a support plane that lies within a defined support angle range, wherein the support plane is a plane perpendicular to a vertical direction and wherein the absolute value of the defined support angle range has a value between 5° and 10°.

[0012] The medical device comprises a control device, a motion sensor, a position sensor, and a time-measuring device. The motion sensor is designed to detect a movement of the device and generate an electronically analyzable movement value that can be evaluated by the control device. A movement is characterized, for example, by a change in position and / or angle of the device in space. A movement can be uniform or involve acceleration. A movement can be detected even if it is very slight.

[0013] The position sensor can determine an angular position in space. The position sensor does not determine an absolute position in space; rather, the position sensor is designed to determine a relative angle of inclination with respect to a reference plane. If the position sensor determines an angular position parallel to or in this reference plane, the angular deviation relative to the reference plane is zero. An angle relative to this reference plane is referred to as the angle of inclination. The angle of inclination defines a second plane that is perpendicular to the reference plane. The angle of inclination relative to the reference plane is transmitted to the control device. The reference plane is defined as a plane in which the medical device can be placed. This reference plane is therefore referred to as the placement plane in this application.The angle of inclination determined by the position sensor is independent of the position in space at which the storage plane is defined, since the angle of inclination is identical for all planes parallel to this storage plane.

[0014] The medical device further comprises a time measurement device with which a time period can be measured. A time period is a period of time or a period of time with a start time and an end time.

[0015] In order for the control device to generate a shutdown signal, the following two conditions must be met continuously throughout the entire time period: The movement value falls below a threshold value and at the same time the position sensor detects an inclination angle with respect to a storage plane that lies within a defined storage angle range.

[0016] The automatic activation of a shutdown signal only occurs when a combination of motion detection and tilt angle detection, for example, a placement position on a shelf, is continuously detected by the motion sensor and the position sensor over a specific period of time. A shutdown signal is therefore only activated when the device is placed in a defined placement position and is not moved for the specified period of time.

[0017] During use, it must be ensured that the medical device remains switched on. The medical device is in use when it is being moved, especially when being held by a hand. This means that the motion sensor detects a movement value that exceeds a threshold. The medical device remains switched on.

[0018] If the medical device is not moved or is only moved slightly for a long period of time, for example if it is attached to a holder or if it is held in a certain position for a long time by a user during an operation, it is possible that no movement is detected and the determined movement value falls below the threshold value for a specified minimum period of time.

[0019] However, since the medical device is not in a storage position, the device is oriented in an angular range that lies outside the defined storage angle range. Since it is arranged at an inclination angle that deviates from a storage position, the position sensor detects an inclination angle relative to the storage plane that lies outside a defined storage angle range. Thus, the second condition mentioned above is not met, and the medical device remains switched on.

[0020] Detection of the tilt angle thus ensures that the medical device cannot be accidentally deactivated. Even if the medical device is put down for a short period of time that is shorter than the specified time period, for example, if it is put down and picked up again shortly afterwards, the device remains switched on.

[0021] Defining a placement angle range enables reliable generation of the shutdown signal, even if the medical device is positioned at an angle on the placement plane, for example, if it is placed with a corner or edge resting on another object. Likewise, the placement plane can be positioned at a specific angle relative to a horizontal plane. The placement plane can be any plane in space. The placement plane and the placement angle range can be defined by the medical device manufacturer and / or by the user.

[0022] The threshold value ensures that very small movements, such as vibrations on a storage surface, are not detected as movement and prevent the activation of a shutdown signal.

[0023] In this way, a shutdown signal is reliably generated if the medical device is to be put down for a period longer than the defined time period. The shutdown signal causes the medical device to shut down. This shutdown advantageously reduces energy consumption. The device generates no heat, and any light source is switched off. The service life and lifespan of the medical device are extended.

[0024] In one embodiment of the invention, the storage plane is a plane perpendicular to a vertical direction.

[0025] A plumb line is a vector in the direction of gravitational acceleration and points toward the Earth's center. This plumb line can therefore be easily determined using a position sensor. A support plane perpendicular to this plumb line forms a horizontal plane parallel to the Earth's surface. If the support plane is aligned horizontally, a medical device can be safely stored.

[0026] In one embodiment of the invention, the amount of the defined offset angle range has a value between 0° and 10°.

[0027] When the medical device is placed on a storage level, the device can tilt and assume various angular positions that still form a storage position. The storage level can also be slightly angled. A storage angle range between 0° and 10° allows a storage position to be reliably detected and a shutdown signal to be generated.

[0028] In one embodiment of the invention, the amount of the defined offset angle range has a value between 0° and 5°.

[0029] A very tight tolerance for the defined storage angle range is advantageous when the medical device is stored in a dedicated device.

[0030] In one embodiment, the medical device is an endoscope.

[0031] An endoscope is a handheld medical device that can be used in various positions. A motion sensor and / or a position sensor can advantageously be integrated into an endoscope. An endoscope can include an illumination device with a light source. The light source can advantageously be switched off by the switch-off signal to reduce light exposure. Switching off reduces energy consumption and potential heat generation. The service life and lifespan of the medical device are extended.

[0032] In one embodiment of the invention, the time period is between 30 seconds and 60 seconds.

[0033] This advantageously prevents premature shutdown during a short storage time of less than 30 seconds, for example, if the medical device is picked up again after this short storage time. If the shutdown signal is triggered after a period of between 30 and 60 seconds, unnecessary energy consumption is significantly reduced. This time period is optimal for surgical use.

[0034] In one embodiment of the invention, the time period is between 30 seconds and 40 seconds.

[0035] Energy management can be further optimized by setting a time interval of between 30 and 40 seconds, extending the availability of the medical device.

[0036] In one embodiment of the invention, the motion sensor and the position sensor are formed by a single three-axis gyro sensor.

[0037] Advantageously, the three-axis gyro sensor can simultaneously detect the motion value and the tilt angle. This allows a single sensor to function as both the motion sensor and the position sensor. Gyro sensors can be very small and are inexpensive.

[0038] In one embodiment, the medical device has an image acquisition system and the movement value can be determined by analyzing the images provided by the image acquisition system.

[0039] An image acquisition system can capture images in chronological order. From these images, a movement value can be derived in the control system, for example, using image processing software. This advantageously allows a movement value to be generated that is independent of a vertical direction. The image acquisition system thus functions as a motion sensor. The position sensor does not need to be used to determine a movement value.

[0040] In one embodiment of the invention, the medical device comprises a metal sensor or a Hall sensor.

[0041] A metal sensor can advantageously detect a metallic storage surface. A Hall sensor can advantageously detect a storage position that has magnetic properties or includes a magnet. The detection of a storage position can thus be specified.

[0042] In one embodiment of the invention, the power supply is wireless and comprises a battery or accumulator.

[0043] The operating time of battery- or accumulator-powered medical devices can be significantly extended if they are deactivated by a shutdown signal when not in use. Changing the power source, which can unnecessarily extend the duration of an operation, is avoided. A longer battery or accumulator lifespan also reduces environmental impact and operating costs.

[0044] In one embodiment, a stand-by mode can be activated after the shutdown signal is triggered.

[0045] In standby mode, the medical device can be reactivated very quickly. The position sensor can be used advantageously to detect when the device is being reactivated, for example, if the tilt angle is outside the tilt angle range.

[0046] In one embodiment, a complete shutdown of the medical device can be effected after the shutdown signal has been triggered.

[0047] A complete shutdown results in the greatest possible energy savings, as there is no quiescent current. Accidental restart, for example, due to an impact on the device that can be detected by the motion sensor, is avoided.

[0048] Likewise, there is no unwanted activation if the device is moved on the storage device and then placed again in another location.

[0049] In one embodiment, reactivation of the medical device is only possible via a reactivation control element.

[0050] This advantageously prevents unwanted reactivation. The device is only switched on again when a user picks up the medical device and presses the reactivation control element, such as a power button.

[0051] According to the invention, a method for triggering a shutdown signal for a medical device with a control device, a motion sensor, a position sensor and a time measuring device comprises the following steps: a. Determining a movement value using the motion sensor b. Comparison of the movement value with a threshold value c. Determining an angle of inclination relative to a support plane by the position sensor, wherein the support plane is a plane perpendicular to a plumb line d. Comparison of the inclination angle with a defined angle range e. Determine a time period f. Triggering the shutdown signal if the movement value falls below the threshold value during the entire time period and at the same time the inclination angle is within the offset angle range, whereby the amount of the defined offset angle range has a value between 5° and 10°.

[0052] The method according to the invention generates a shutdown signal for an electronic medical device comprising a control device, a motion sensor, a position sensor, and a time-measuring device. A shutdown signal is only activated when a movement value continuously falls below a threshold value during the entire time period and, at the same time, an inclination angle relative to a storage plane lies within the storage angle range. The shutdown signal is activated after the time period has elapsed, if the device is placed in a defined storage position and is not moved during the time period.

[0053] In this way, a shutdown signal is reliably generated if the medical device is put down for a period longer than the defined time period. The shutdown signal causes the medical device to shut down. This shutdown advantageously reduces energy consumption. The device generates no heat, and any light source is switched off. The service life and lifespan of the medical device are extended.

[0054] Further advantages and features of the invention are explained with reference to the following drawings, in which: Fig. 1 an endoscope lying on a shelf in a lateral-horizontal position; Fig. 2 the endoscope according to Fig. 1, lying sideways on a shelf in a tilted position; Fig. 3 a program flow chart for controlling the switch-off function of the endoscope; Fig. 4 a block diagram of a medical device.

[0055] The Fig. Figure 1 shows an endoscope lying on a tray in a lateral-horizontal position. An endoscope is an example of a medical device.

[0056] An endoscope 100 comprises a handpiece 101 and a probe 102. Gripping surfaces 104 are attached to the outside of the handpiece 101. A control device, an image recording device, a lighting device, a position and motion sensor, a time measurement device, and an interface for data transmission are arranged inside the handpiece 101. The endoscope can be coupled to a monitor or a surgical microscope with a cable or wirelessly via a transceiver unit. The endoscope can further comprise an energy storage device for a mains-independent power supply, for example, a battery or a rechargeable accumulator or a very large-capacity capacitor. The control device is, for example, a microcontroller.

[0057] The probe 102 is arranged on the head portion of the handpiece 101. The probe 102 is a long, thin tube that can be inserted into a tissue area. The probe 102 comprises a first light guide for illuminating a tissue area and a second light guide that is guided to the image recording device. An optical system (not shown) can be arranged at the distal end 103 of the probe 102. A transition element to the handpiece 101 is arranged at the proximal end 106 of the probe 102.

[0058] The endoscope 100 is hermetically sealed. However, when used during surgery, the endoscope 100 can also be protected by a sterile protective film, known as a drape.

[0059] The endoscope 100 rests with a side surface 105 on a storage plane, a sterile table 110. The sterile table 110 is a storage surface on which medical tools and devices are provided during an operation. The storage plane forms a horizontal XY plane. The sterile table 110 can be covered with a sterile drape (not shown) during an operation. The endoscope 100 rests with its entire side surface 105 flat on the sterile table 110. The probe 102 is located at a parallel distance to the sterile table 110 over its entire length. The flat position of the endoscope 100 on the sterile table 110 is indicated by an auxiliary line 120. The auxiliary line 120 defines a straight line on the surface of the sterile table 110 in the XY plane. The probe 102 is arranged parallel to the auxiliary line 120.

[0060] The Fig. 2 shows the endoscope 100 according to Fig. 1, which lies on a shelf in a tilted position. The reference numerals are increased by 100. The Fig. The endoscope 100 shown in Figure 1 lies with its side surface 105 flat on the sterile table 110. A Fig. The endoscope 200 shown in Figure 2 differs from the one shown in Fig. 1 shown endoscope 100 in that the endoscope 200 lies tilted sideways on a sterile table 210.

[0061] In this case, a distal end 203 of a probe 202 touches the sterile table 210. An auxiliary line 220 defines a straight line on the surface of the sterile table 210 in an XY plane. A first point of the auxiliary line is formed by the point of contact of the distal end 203 of the probe 202 with the sterile table 210. A second point of the auxiliary line is defined by the perpendicular projection of a proximal end 206 of the probe 202 onto the sterile table 210. In this case, an angle of inclination 207 is formed between the auxiliary line 220 and the probe 202 in a plane perpendicular to the XY plane. The angle of inclination 207 is small and can have an amount of up to 10°, for example, an amount between 5° and 10°.

[0062] In the Fig. 1 and Fig. In the situations shown in Figure 2, the endoscope 100, 200 is in place and not moved. Therefore, the motion sensor detects a movement value that falls below a threshold. Fig. 1, the position sensor determines an angle of inclination of 0° relative to a storage plane formed by the sterile table 110. In Fig. 2, the position sensor detects an inclination angle 207 of 5° relative to the storage plane, the sterile table 110. Since in both cases the movement value continuously falls below a threshold value throughout the entire time period and, at the same time, the position sensor detects an inclination angle relative to the storage plane that lies within a defined storage angle range of 0° to 10°, a shutdown signal is generated. This shutdown signal causes the endoscope 100, 200 to be completely shut down.

[0063] In Fig. 1 and Fig. 2, the storage level of the sterile table 110, 210 is formed. The sterile table is arranged horizontally. The storage level can also be formed by a storage device or holding device, in which the storage level is defined by a vertical plane or a plane arranged obliquely in space. The storage level can be adjusted by the user of the medical device or the endoscope 100, 200 according to Fig. 1 and Fig. 2. For this purpose, the control device can be coupled to a user interface, for example, a GUI. Advantageously, a storage level or storage device can also be detected in combination using an additional Hall or metal sensor (not shown). If the endoscope 100, 200 is to be used during an operation at an inclination angle that lies within the defined storage angle range, the function for generating the shutdown signal can also be deactivated, for example, using the GUI.

[0064] In the Fig. 3 shows a program flow chart 300 for controlling the switch-off signal of the endoscope.

[0065] The endoscope is switched on 302 in a first step, for example by pressing a power button. In a subsequent first decision step A, designated by reference numeral 304, a check is made to determine whether the endoscope can be registered in a device network. The device network comprises a visualization device and may also comprise a surgical microscope, a navigation system, or other devices. If the endoscope is not registered in a device network, this check is repeated. This check is repeated until a first time period t1 has elapsed. The expiration of the first time period t1 is checked in a second decision step 308. The first time period t1 is 30 seconds. After the first time period t1 has elapsed, the endoscope is switched off 324 in a final step. This function is a protective function.The goal is to ensure that a receiver is available that can receive the endoscope's data. If no receiver is found, unnecessary power consumption should be avoided.

[0066] If the endoscope finds a receiver in a device network in the first decision step A 304, a third decision step B, designated by reference numeral 312, checks whether the "permanently on" function is activated. If this "permanently on" function is activated, the endoscope remains switched on until the endoscope is switched off by the user. The "permanently on" function is activated when the endoscope is used in an angular position in which an inclination angle lies within the defined tilt angle range. The "permanently on" function can be used to prevent the triggering of a shutdown signal.

[0067] If the "Permanent On" function is deactivated or will be deactivated, the program proceeds to the fourth decision step C, designated by reference numeral 316. In the fourth decision step C 316, the parameters of the position and movement data are evaluated. If the endoscope is moved or an inclination angle relative to a storage plane is detected that is not within a defined storage angle range, the program returns to the third decision step B 312. The endoscope remains activated.

[0068] In the fourth decision step C 316, the parameters of the position and movement data are checked. If the movement value falls below a threshold value and at the same time the position sensor detects an inclination angle relative to a storage plane that lies within a defined storage angle range, i.e. that the endoscope has been stored in a preset storage position, then in a fifth decision step 320 it is checked whether a second time period t2 has already elapsed. The second time period t2 is 30 seconds. If the check of the parameters of the position and movement data reveals a change within the second time period t2, for example if the endoscope is moved, i.e. the movement value exceeds a threshold value, or is recorded again by a user, i.e.If the angle of inclination detected relative to a placement plane is no longer within the defined placement angle range, the program returns to the third decision step. The endoscope remains activated.

[0069] If the second time period t2 has elapsed in the fifth decision step without the check of the parameters of the position and movement data in the fourth decision step C 316 resulting in a change, ie that the endoscope was placed in a preset storage position, then in a final step a switch-off signal is triggered and the endoscope is switched off 324.

[0070] During shutdown 324, the endoscope is not placed into standby or sleep mode, but is completely shut down. It is also conceivable that the user is informed by a warning message before shutdown that the device is about to shut down. The endoscope can only be activated by switching it on again 302, for example, by pressing the power button.

[0071] In this example, the first time period t1 and the second time period t2 are each 30 seconds. The first time period t1 and the second time period t2 can also have different values ​​and can be defined as longer or shorter. For example, the first time period t1 and the second time period t2 can also be 40 seconds, 50 seconds, 60 seconds, or any value in between.

[0072] The preset storage position relative to the storage plane can be defined by a lateral position. The lateral storage position includes an angular range, the magnitude of which is, for example, between 0° and 10°. This angular range is larger if the endoscope can tilt in a storage position or if the storage surface is not flat or is arranged at an angle in space. The angular range is smaller if the preset storage position is achieved by placing the endoscope in a holder that promotes a preset storage position of the endoscope through a specific shape. The preset storage position can advantageously be set using software.

[0073] The endoscope should be completely switched off to ensure that a possible quiescent current does not further reduce the service life of the endoscope. However, if the quiescent current is so small that it only insignificantly reduces the service life of the power supply or has a minimal impact on the overall energy balance, it is also conceivable to switch to standby mode instead of a complete shutdown. In this standby mode, the endoscope could also be reactivated, for example, by the position sensor if it detects a position other than the storage position.

[0074] The Fig. 4 shows a block diagram of a medical device.

[0075] The medical device 400 comprises a control device 401, a motion sensor 402, a position sensor 404, a time measurement device 406, an illumination device 408, an image recording device 410, and an interface 412. The motion sensor 402 is connected to the control device 401 via a first line 403. The position sensor 404 is connected to the control device 401 via a second line 405. The time measurement device 406 is connected to the control device 401 via a third line 407. The time measurement device 406 can also be formed by a software timer in the control device 401.

[0076] The control device 401 can control the lighting device 408 via a fourth line 409. The image recording device 410 is connected to the control device 401 via a fifth line 411. The interface 412 is connected to the control device 401 via a sixth line 413.

[0077] The control device 401 is, for example, a microcontroller. A switch (not shown) for switching on the medical device can be connected to the control device 401.

[0078] The motion sensor 402 and the position sensor 404 can also be formed by a single three-axis gyro sensor. The image recording device 410 is, for example, a camera. The medical device is coupled to a visualization device, for example, a monitor or a data input of a surgical microscope, via an interface 412. A manual control switch, a foot switch, or a GUI can also be coupled to the control device 401 via the interface 412. It is conceivable that the medical device 400 can also be controllable via a surgical microscope. The interface 412 can also have a bidirectional transmitting and receiving unit. In this example, the medical device is powered by a battery (not shown). The medical device 400 can be an endoscope. List of reference symbols 100, 200 endoscope 101, 201 handpiece 102, 202 probe 103, 203 Distal end of the probe 104, 204 grip surfaces 105, 205 side surface 106, 206 Proximal end of the probe 110, 210 Sterile table 207 inclination angle 120, 220 auxiliary line 300 Program flow chart 302 Switch on 304 First decision step A 308 Second decision step 312 Third decision step B 316 Fourth decision step C 320 Fifth decision step 324 shutdown 400 Medical Device 401 Control device 402 Motion Sensor 403 First line 404 Position sensor 405 Second line 406 Timekeeping device 407 Third Line 408 Lighting device 409 Fourth Line 410 Image recording device 411 Fifth Line 412 interface 413 Sixth Line

Claims

[1] Medical device comprising a control device (401), a motion sensor (402) with which a movement value can be determined, a position sensor (404) with which an angular position in space can be detected, a time measuring device (406) with which a time period can be determined, wherein the control device (401) is designed such that a switch-off signal can be generated if during the entire period the movement value falls below a threshold value and at the same time the position sensor (404) detects an inclination angle (207) relative to a storage plane which lies within a defined storage angle range, wherein the storage plane is a plane perpendicular to a vertical direction, wherein the amount of the defined storage angle range has a value between 5° and 10°. [2] Medical device according to the preceding claim, wherein the medical device is an endoscope (100, 200). [3] Medical device according to one of the preceding claims, wherein the time period is between 30 seconds and 60 seconds. [4] Medical device according to one of the preceding claims, wherein the motion sensor (402) and the position sensor (404) are formed by a single three-axis gyro sensor. [5] Medical device according to one of claims 1 to 3, wherein the medical device has an image acquisition system and the movement value can be determined by an analysis of the images provided by the image acquisition system. [6] Medical device according to one of the preceding claims, comprising a metal sensor or a Hall sensor. [7] Medical device according to one of the preceding claims, with a wireless power supply comprising a battery or an accumulator. [8] Medical device according to one of the preceding claims, wherein a complete shutdown of the medical device can be effected after the shutdown signal has been triggered. [9] Method for triggering a shutdown signal for a medical device with a control device (401), a motion sensor (402), a position sensor (404) and a time measuring device (406), comprising the following steps: a. Determining a movement value by the motion sensor (402) b. Comparison of the movement value with a threshold value c. Determining an angle of inclination (207) relative to a storage plane by the position sensor (404), wherein the storage plane is a plane perpendicular to a vertical direction d. Comparison of the inclination angle (207) with a defined angle range e. Determine a time period f. Triggering the switch-off signal if the movement value falls below the threshold value during the entire time period and at the same time the inclination angle (207) lies within the offset angle range, the amount of the defined offset angle range having a value between 5° and 10°.

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