fig1 shows a patient 2 on a bed 4 with an endorobot 6 , which has an actuator 8 , shown only schematically in fig1 , a control unit 10 with a sensor 11 and a transmission wire 12 . the transmission wire 12 includes a transmit and receive coil , which generates an alternating electromagnetic field 14 and receives the alternating field 14 . the sensor 11 or control unit 10 measures the alternating field 14 . the control unit 10 may excite the alternating field 14 with one or more adjustable fixed or variable frequencies and may evaluate the receive signal received from the coil . fig2 shows the actuator 8 of the endorobot as depicted in fig1 . the actuator 8 includes three energy absorption elements in the form of heat elements 16 a - c . the heat elements 16 a - c may be connected to a function unit 18 a - c . the first heat element 16 a may absorb electromagnetic radiation 14 , for example , radio radiation , through induction from a first absorption frequency band . the first absorption frequency band corresponds to material 20 a of the heat element 16 a , for example , ferrite material , in such a way that the material 20 a can readily absorb the electromagnetic radiation 14 and can readily convert it into heat through remagnetization losses . the heat elements 16 b and 16 c may be embodied similar to the heat element 16 a . the heat elements 16 b and 16 c may comprise a slightly different material 20 b , 20 c , corresponding to a second or third absorption frequency band . the three absorption frequency bands are slightly different in their frequency position and do not overlap . each heat element 16 a - c leaves electromagnetic radiation from one of the adjacent frequency bands essentially unabsorbed . the three heat elements 16 a - c may be controlled by the control unit 10 separately through three different excitation frequencies . the three function units 18 a - c are fashioned fulfill their own function . fig3 shows four different actuators 22 a - d that include heat elements 24 a - d and function unit 26 a - d . in the actuator 22 a , the heat element 24 a and the function unit 26 a are arranged in layers on top of one another . in the actuator 22 b , the heat element 24 b includes many small elements in the function unit 26 b . actuator 22 c includes a heat element 24 c that is arranged inside the function unit 26 c . actuator 22 d includes a heat element 24 d that is arranged outside the function unit 26 d . the position of the heat elements 24 a - d in relation to their function units 26 a - d is determined by the function to be fulfilled by the function units 26 a - d . the actuators 8 , 22 a - d may cool the heat elements 16 a - c , 24 a - d . the heat elements 16 a - c , 24 a - d may be arranged on the outside in the actuator 8 , 22 a , 22 d and / or have a heat transfer unit that transfers heat from the heat element 16 a - c , 24 b , 24 c to outside the actuator 8 , 22 b , 22 c . the heat transfer unit may include a function unit 26 b , 26 c , which is provided for the transfer of heat . the thermal connection of the heat elements 16 a - c , 24 a - d to the surroundings of the actuator 8 , 22 a - d enables the heat elements 16 a - c , 24 a - d to cool rapidly after heating . the respective function units 18 a - c , 26 a - d may return rapidly to its initial status , for example , its starting position . fig4 to 12 show additional embodiments of actuators 28 , 36 , 60 , 72 , 84 , 98 . the mode of operation is analogous to that of the above - described actuators 8 , 22 a - d . fig4 shows one embodiment of an actuator 28 that includes a heat element 30 and a function unit 32 with two gripping arms 34 , which are shown on the left - hand side of fig4 in the open position and on the right - hand side of fig4 in the closed position . one or both of the two gripping arms 34 , which rest in the open position when a heat element is cold , include memory metal . when the heat element 30 is heated , heat is transferred from the heat element 30 to the gripping arms 34 . at a predetermined temperature , the gripping arms 34 move into the closed position and remain there for as long as their temperature lies above the predetermined temperature . the gripping arms 34 may be used to grip ( hold ) a piece of tissue . the gripping arms 34 may be used to separate the gripped tissue from other tissue . in one embodiment , as shown in fig5 , the actuator 36 includes a heat element 38 and a function unit 44 . the heat element 38 may include an expandable container 42 filled with liquid 40 . the function unit 44 may include a die . the heat element 38 and function unit 44 may be disposed in a housing 46 . the housing 46 may include a wall 48 and a floor 50 . when the heat element 38 is heated , the liquid 40 is heated through the direct absorption of electromagnetic radiation or through radiation - absorbing particles , for example , ferrite particles . the liquid 40 may include the radiation - absorbing particles . the boiling point of the liquid 40 may be around 45 ° c . the heat capacity of the liquid 40 may be low . the liquid 40 may boil even when a low amount of heat is transferred to the liquid 40 . the container 42 may fill with gas 52 and expand . the die executes a working movement by being forced out of the housing 46 . when cooled , the die travels back into the housing 46 again . alternatively , the floor 50 may include a heat element that transfers its heat to the liquid 40 . as shown in fig6 , a tripod 54 includes three actuators 36 . the tripod includes a base plate 56 and a working plate 58 . the heat elements 44 of the actuators 36 are set to different absorption frequency bands . the actuators 36 may be controlled independently of each other . the working plate 58 may be moved in three axes of freedom , for example , may be swiveled two - dimensionally and raised and lowered in the direction of displacement of the function units 44 . a tripod 54 may be used , for example , for moving a camera . in one embodiment , as shown in fig7 , an actuator 60 includes a heat element 62 and a function unit 64 having an outer skin . the heat element 62 includes an elastic material 66 , for example , a gel or an elastomer . the elastic material 66 absorbs energy from an alternating electromagnetic field either of its own accord or with the aid of embedded particles . the elastic material 66 may include liquid bubbles 68 , the liquid of which evaporates when heated sufficiently and gas bubbles 70 form as a result to cause an expansion of the outer skin . as shown in the right side of fig7 , a vessel may be expanded , for example , by using gas bubbles 70 . in one embodiment , as shown in a sectional view of fig8 , an actuator 72 includes a function unit 74 for holding in a vessel 76 . the heat element 78 of the actuator 72 includes a mixture of an absorption liquid 80 that absorbs energy from an alternating electromagnetic field and a liquid 72 that evaporates . the function unit 74 like the heat element 78 is elastic and may be directed ( connected ) around the heat element 78 . a plurality of separate holding elements may form the function unit 74 . as shown in fig9 , the actuator 84 may expel a medically active liquid 86 from an inner cavity 88 into the surroundings 90 of the actuator 84 . the actuator 84 may include a liquid 92 that serves as a heat element . when heated , the liquid 92 evaporates to form a gas 94 . the gas 94 displaces a die 96 , which forces the liquid 86 out of the inner cavity 88 . as shown in fig1 and 11 , an actuator 98 is used for a targeted movement . the actuator 98 includes three separately controllable heat elements 100 a - c . the heat elements 100 a - c lie in an evaporable medium that is distributed between three chambers 102 a - c . the chambers 102 a - c are separated from one another in a gastight manner by two seals 104 . the chambers 102 a - c may be expanded separately by the evaporable medium . the two outer chambers 102 a , 102 c are held constant in their expansion in an axial direction by two holders 106 , for example , a screw directed through the heat element 100 a , 100 c . the central chamber 102 b is limited in its expansion perpendicular to the axial direction by retaining rings 110 . fig1 shows the actuator 98 in tension - relieved status , for example , with cool heat elements 100 a - c . fig1 shows the actuator 98 with evaporated medium and maximally expanded chambers 102 a - c . fig1 shows seven acts of movement of the actuator 98 through a vessel 112 . shown in tabular form on the right - hand side of fig1 are the frequencies f 1 , f 2 and f 3 with which the transmission medium 12 radiates the alternating electromagnetic field . the heat element 100 a absorbs radiation with the frequency f 1 , the heat element 100 b absorbs radiation with the frequency f 2 , and the heat element 100 c absorbs radiation with the frequency f 3 . the heat elements 100 a - c leave radiation with the other two frequencies f 1 , f 2 or f 3 essentially unabsorbed . in a first act , no alternating electromagnetic field radiates from the transmission medium . consequently , all three heat elements 100 a - c are cool . the medium is relieved of tension everywhere and the chambers 102 a - c are not expanded . in the second to the fourth acts , the transmission medium 12 radiates an alternating electromagnetic field with the frequency f 1 , then with f 2 and f 3 , and with all three frequencies f 1 , f 2 and f 3 . initially only the first heat element 102 a , then two heat elements 102 a , 102 b , and then all three heat elements 102 a - c are heated . the actuator 98 in the vessel 112 is tensioned , expanded and then doubly tensioned . in the fifth act , through switching off of the first frequency f 1 , the heat element 100 a emits its heat rapidly to the surroundings and cools down rapidly . the chamber 102 a is relieved of tension . in the sixth act , the chamber 102 a may be pulled by relieving tension of the second chamber 102 b to the third chamber 102 c . in the seventh act , the chamber 102 a is again expanded to double the tension in the vessel 112 . the movement process recommences with a fresh cycle from the second to the seventh acts . the cycle may be repeated for targeted movement through the vessel 112 . the movement may be controlled by the control unit 10 . movement through a curved vessel is also possible without problems . the control unit controls the heat elements 100 a - c using the frequency f 1 , f 2 , f 3 respectively assigned to the respective heat element 100 a - c . in one embodiment , the control unit 10 monitors behavior of the heat elements 16 a - c , 24 a - d , 30 , 38 , 62 , 78 , 100 a - c with the aid of the sensor 11 and / or the coil . the sensor 11 serves to determine the size of the heat element 16 a - c , 24 a - d , 30 , 38 , 62 , 78 , 100 a - c or volume of gas by ultrasound or x - ray radiation and / or to determine an energy absorption of the heat element 16 a - c , 24 a - d , 30 , 38 , 62 , 78 , 100 a - c via damping of the alternating field . the control unit 10 may vary a frequency of the alternating field and to determine an absorption depending on the frequency . this produces an absorption displacement from which the control unit 10 determines with the aid of previously determined empirical data a movement or size status of the heat elements 16 a - c , 24 a - d , 30 , 38 , 62 , 78 , 100 a - c . the sensor 11 may include a plurality of sensor elements . the plurality of sensor elements may monitor independently a plurality of heat elements 16 a - c , 24 a - d , 30 , 38 , 62 , 78 , 100 a - c . various embodiments described herein can be used alone or in combination with one another . the forgoing detailed description has described only a few of the many possible implementations of the present invention . for this reason , this detailed description is intended by way of illustration , and not by way of limitation . it is only the following claims , including all equivalents that are intended to define the scope of this invention .
a robotic endoscopy actuator is provided . the robotic endoscopy actuator includes a function means ; and an energy absorption element that is operable to absorb energy from an electromagnetic field . the energy absorption element includes a heat element . the function means is operable to fulfill a function using heat energy .