Abstract: Systems and processes for determining pressure settings for a percussive massage applicator are described. According to one embodiment, a method comprises obtaining an operational current measurement of the motor when the motor has a load. difference value is determined between the current measurement and the operational current measurement. The difference value is compared to two or more predetermined ranges of values that correspond to a pressure level of the percussive applicator. The pressure level may be provided as feedback to the user.

Abstract: Provided is a massage module and a massage device including same. The massage module may include: a procedure member including an upper finger member and a lower finger member cooperating with the upper finger member; and a cam driving part connected to the upper finger member so as to move the upper finger member in the vertical direction, so that the upper finger member and the lower finger member are away from or close to each other.

Abstract: Exemplary embodiments of massaging devices are disclosed herein. One exemplary embodiment includes a piston having a longitudinal axis, a massaging head connected to the piston, a motor located on a first side of the longitudinal axis and a handle located on a second side of the longitudinal axis. A drive mechanism for moving the piston and massage head is also included.

Abstract: Systems, devices, and methods are described herein that relate to massage devices with force control and feedback for providing pain relief and improved muscle recover to users. The massage devices can output mechanisms for applying a mechanical output to a muscle area of a user to treat a muscle condition, driving mechanisms for driving the movement of the output mechanisms, and sensors for measuring force and other properties associated with application of the mechanical output. The massage devices can be configured to adapt therapy being applied to a muscle area or provide users with feedback based on sensor measurements.

Abstract: A self-contained reciprocation mechanism is coupleable within an enclosure of a percussive massage device and is configured to receive an applicator head for stimulating a user's muscles. The self-contained reciprocation mechanism includes a spatial positioning bracket, a semi-cylindrical bracket, a piston, a motor, a crank, and a reciprocation linkage. The spatial positioning bracket is configured to receive the other interconnected components of the self-contained reciprocation mechanism and position said components relative to each other at close predetermined tolerances to assure that the interconnected components are properly positioned to provide consistent operating characteristics. The self-contained reciprocation mechanism is coupled within the enclosure using screws which extend through mounting tabs of the spatial positioning bracket.

Abstract: A vibration therapy device that includes a housing that includes a handle portion, a head portion and a module seat defined on the head portion, an electrical source, a motor positioned in the housing, a switch for activating the motor, a push rod assembly operatively connected to the motor and configured to reciprocate in response to activation of the motor, and a therapy module removably secured to the module seat. The distal end of the push rod assembly is configured to removably receive a reciprocating attachment thereon. The therapy module at least partially surrounds the distal end of the push rod assembly.

Abstract: A percussive massage device includes a self-lubricating cylinder extending along a longitudinal axis. A motor shaft rotates about a central axis perpendicular to the longitudinal axis. A crank coupled to the shaft includes a pivot offset from the central axis. A reciprocation linkage is coupled between the pivot and a piston that moves longitudinally within the cylinder. An applicator head coupled to a second end of the piston has an end exposed outside the cylinder for application to a person receiving treatment. An annular gasket positioned between the cylinder and the applicator head removes lubricant from an outer surface of the piston to inhibit the lubricant from reaching the applicator head.

Abstract: A percussive massage device includes an enclosure having a cylindrical bore that extends along a longitudinal axis. A motor has a rotatable shaft that rotates about a central axis perpendicular to the longitudinal axis. A crank coupled to the shaft includes a pivot, which is offset from the central axis of the shaft. A reciprocation linkage has a first end coupled to the pivot of the crank. A piston has a first end coupled to a second end of the reciprocation linkage. The piston is constrained to move within a cylinder along the longitudinal axis of the cylindrical bore. An applicator head has a first end coupled to a second end of the piston and has a second end exposed outside the cylindrical bore for application to a person receiving treatment. A motor controller measures current applied to the motor and displays a pressure indicator responsive to the measured current.

Abstract: A massage machine includes a seat unit on which a treatment subject person is configured to sit, a backrest unit configured to support a back of the person sitting on the seat unit, a base that is disposed in front of the backrest unit; and a treatment mechanism that is attached to the base configured to perform a massage on a shoulder of the person in a state where the person sits on the seat unit. The treatment mechanism includes a drive unit which includes an output shaft attached to the base and rotated by supplied power, and a treatment device configured to press the shoulder from above. In accordance with rotation of the output shaft, the treatment device oscillates in an upward/downward direction so as to perform the treatment on the shoulder.

Abstract: Under the control of a controller, a drive mechanism portion moves a massaging member and an ascent-descent mechanism moves up and down the massaging member together with the entire drive mechanism portion. During an ordinary kneading massage, the massaging member performs a relative motion to describe a reference locus in the shape of a closed curve. The controller controls to make the massaging member perform a relative reciprocating movement within a partial movement range corresponding to a partial segment of the reference locus and simultaneously controls to make the ascent-descent mechanism move the drive mechanism portion up and down. The relative reciprocating movement of the massaging member along the partial segment of the reference locus and the up-down movement of the entire drive mechanism portion are combined together to produce a new motion of the massaging member describing a locus different from the reference locus.

Abstract: A method for controlling stress includes (a) providing an individual with (i) stimulator devices, each having a wireless receiver, a selectively controllable tactile stimulator, a processor that processes digitally encoded instructions in received wireless signals and controls the operation of the tactile stimulator in response thereto and (ii) a programmable mobile device controller containing a memory component configured to hold application instructions for receiving input from the individual including the intensity and speed of stimulation through a graphical user interface, processor(s) for executing the application instructions, and a wireless relay for transmitting the digitally encoded instructions to the stimulator devices, (b) having the individual place the stimulator devices bilaterally on and in direct or indirect contact with the individual's body, (c) having the individual set the speed and intensity of the stimulation, and (d) causing the controller to store the individual's speed and intensit

Abstract: A percussion massager comprises a motor, a reciprocating assembly, a mallet, a power source, a housing, and a fixing frame. The motor, the reciprocating assembly and the power source are operably arranged in the housing. The motor comprises a main body and a first rotary shaft. Part of the mallet is not located in the housing. The first rotary shaft of the motor is operably mechanically connected with the reciprocating assembly. The reciprocating assembly is mechanically connected with the mallet. The fixing frame is installed in the housing. The main body of the motor and the reciprocating assembly are installed on the fixing frame. The main body of the motor and the reciprocating assembly are installed in the housing via the fixing frame only. When the motor is electrically connected with the power source, it rotates to drive the reciprocating assembly to reciprocate under the driving of the power source, thereby driving the mallet to make reciprocating linear motion for repeated striking.

Abstract: The present invention discloses a pressure generator and a massager. The pressure generator includes a shell defining a first opening and a receiving space, a movable member extending into the receiving space and a drive device driving the movable member to reciprocally move within the receiving space. A gap is defined between the movable member and the inner wall of the shell.

Abstract: A hand-held device for electrically powered skin treatment includes a housing which is adapted to be grasped by a hand of a user, a first outer electrode which is adapted to be in contact with the hand of the user when the device is held in the hand of the user for use, a second outer electrode disposed on a side of the housing where the second outer electrode is placeable on an area of skin to be treated, and an electrically operated vibrator where the electrically operated vibrator is fixed by a socket on a side wall of the housing and is adapted to vibrate the side wall together with the second outer electrode when operated so that during operation of the device, the device produces an intensified massaging effect on the area of skin to be treated.

Abstract: A system, device, and method for therapeutic deep tissue massage is disclosed. The therapeutic deep tissue massage device includes an apparatus for use in therapeutic massage applications in which forces are provided to an outer surface of a user's, whether human or animal, body and subcutaneously within the user's tissues.

Abstract: A preferred method to obtain a painless or near painless needle 8 penetration is disclosed to be in the following manner: Applying electric current using a TENS device in conjunction with physically stimulating the injection site at a frequency that is dependent on the frequency of the electric current applied to the injection site, followed by a needle 8 penetration into the skin 2.

Abstract: A massage system includes a massage head configured to contact a treatment region of a patient during a massage treatment procedure, a body having a handle, a connector having a first end and a second end, wherein the first end is releasable secured to the body and the second end is coupled to the massage head, a motor positioned within the body and configured to drive movement of the massage head relative to the body, and a platform configured to be placed against the patient during a massage treatment procedure. The platform defines an opening. The platform is positioned so that the massage head extends at least partially through the opening during movement of the massage head relative to the body, and the platform surrounds the massage head in at least one dimension during movement of the massage head relative to the body.

Abstract: A nosebleed-attenuating apparatus including a pressure applicator configured to engage with an external bodily surface proximate an area of nasal vascularization between a nose and an upper lip; and a pressure receiver coupled to the pressure applicator, the pressure receiver configured to receive pressure; whereby an amount of the pressure is transferred to the pressure applicator for application to the external bodily surface.

Abstract: A massage device having a body with two end sections attached to a center section. The center section of the body has a motor and a heating unit, and each end section has an eccentric weight that are connected to the motor such that vibrations generated by the motor are transferred to each eccentric weight. The massage device also has a control mechanism configured to adjust the vibration of the massage device, and a microcontroller connected to the control mechanism and the motor to control the operation of the motor. A storage unit for storing a message device is capable of sanitizing, heating, and charging the message device.

Abstract: A system for treating soft tissue of a patient. The system includes a treatment head and a computer portion. The treatment head includes a probe and an electrode operably coupled to the probe. The probe and electrode are configured to respectively deliver a mechanical force impulse and an electrical stimulation to the soft tissue when placed in operable contact with the soft tissue. The computer portion includes a CPU and is configured to coordinate the delivery of the mechanical force impulse and electrical stimulation relative to each other. The system is configured to sense a shockwave in the soft tissue of the patient, the shockwave resulting from the mechanical force impulse delivered to the soft tissue via the probe. The system is also configured to analyze a characteristic of the sensed shockwave and configure the electrical stimulation to be delivered to the soft tissue via the electrode based on the characteristic analysis of the sensed shockwave.

Abstract: A hand-held device for electrically powered skin treatment is disclosed. Current is passed into the skin from an external electric circuit via an electrode so that active ingredients of a cream applied earlier to the skin can better penetrate into the skin. To aid this effect, a cap of the device, which functions as an electrode, is provided with a vibrator so that the electrode vibrates on the skin, thus working the cream into the skin.

Abstract: A portable article for administrating therapy to a user includes a device positioned along the area of the body requiring therapy. At least one power pod is associated with the device and the power pod simultaneously applies a first force component perpendicular to the user's body surface and a second force component parallel to the user's body surface. An illustrative embodiment is a vest worn by the user during therapy.

Abstract: A mobile automatic massage apparatus which includes a base of an automatic guided vehicle and a few robotic arms attached above it. A 3D scanner on the pole behind the touch screen monitor takes images of the surrounding environment and guides the movement of the vehicle and positioning of the arms. The hands attached to the robotic arms perform the massage according to the programs of a central computer. This massage apparatus can perform similar professional massage provided by the physicians or therapists to improve the blood circulation of the patients and reduce the pain.

Abstract: Exemplary embodiments of massaging devices are disclosed herein. One exemplary embodiment includes a piston having a longitudinal axis, a massaging head connected to the piston, a motor located on a first side of the longitudinal axis and a handle located on a second side of the longitudinal axis. A drive mechanism for moving the piston and massage head is also included.

Abstract: A device (100) for measuring the amount of water in a subject's body includes a main body part (110) formed in a linear shape and an insertion part (120) extending in a curved shape from one end of the main body part (100). The insertion part (120) includes a tip side insertion part (120-2) having a tip surface (122) to which a sensor unit (121) is fixed and a base end side insertion part (120-1), wherein the sensor unit (121) is brought into contact with a body surface of a subject through a slide mechanism. A protective member (651) liquid-tightly covers the slide mechanism between the tip side insertion part (120-2) and a base end side insertion part (120-1). The protective member (651) smoothly connects the outer peripheral surface of the tip side insertion part (120-2) and the outer peripheral surface of the base end side insertion part (120-1).

Abstract: A preferred method to obtain painless or near painless needle 8 penetration is disclosed to be in the following manner: Applying electric current using a TENS device simultaneously with tapping the injection site for 30 to 60 seconds at a rate of about one strike per second, followed by a rapid needle 8 penetration into the skin 2.

Abstract: In a device for introducing shock waves into a living body by way of at least one element (4; 12; 14) which transmits the shock waves and upon which shock pulses act, wherein at least one spring member (2) is used for generating the shock waves, a tensioning device is associated with the spring member and allows for an abrupt release of the spring member while delivering a shock pulse.

Abstract: The present invention relates to a device, system and a method for extracorporeal Shockwave treatment and in particular, to such a device, system and method in which a Shockwave is produced by a high pressure ballistic device utilizing a regulated high pressure energy source for generating an initial ballistic collision producing an initial Shockwave and an electromagnetic solenoid as reloading apparatus facilitating the formation of subsequent and/or successive Shockwaves.

Abstract: A therapeutic device includes a power unit for cyclically moving a therapeutic head unit at a frequency selected to cause compression wave energy to propagate through body tissue to a target scar tissue structure. The therapeutic head unit includes a plurality of differently shaped therapeutic heads to be pressed against the body surface.

Abstract: In the tapping device for producing beautiful skin, a Head contacts with skin. A Tapping mechanism pats the skin facing the Head with a Pad. The Tapping mechanism is equipped with the Pad at one end, and has a Shaft from which the Head projects and rolls back by piston actions. A Biasing member biases the Shaft toward one side of the piston actions. A Wire rod empowers the Shaft towards the direction resisting the biasing power of the Biasing member when tension is provided. An Actuator provides tension intermittently in a Wire rod, the tension of the wire rod and biasing of the bias member providing piston actions.

Abstract: A spring action medical device includes a spring that may propel a hammer component in a distal direction when the spring is released from a loaded state. When propelled forward by the spring, the hammer component makes contact with a distal tip of the medical device. The distal tip may then transfer a force to an external object, such as an occlusion in a body lumen.

Abstract: An external stylus provides an impulse to correct mal-alignments of the Atlas (C1). The placement and direction of the impulse is guided by the analysis of a plurality precisely placed or acquired tomographic images, preferably MRI images.

Abstract: Disclosed is a skin massage device, the proposed idea capable of a skin massage device of scrubbing a skin applied with a massage cream, then giving physical stimulus on the skin at a massage thus helping the relaxation of muscles and activating metabolism to serve an elastic, healthy skin, characterized in that an operation device 15 to reciprocally translate a beating member 21 back and forth is installed at a rotating shaft 14 of a drive motor 15 to which an electric energy of a battery 100 is selectively supplied/blocked according to change of on/off of a rotary switch 12, comprised of the beating member 21 inflicting physical stimulus while interworking with the operation device 15.

Abstract: A battery pack with massage function includes a case, a battery cell, an electrical connector, a switch, a moving body, and an electrical actuator assembly. The case has an accommodation space and a through hole communicating the accommodation space. The battery cell is disposed in the accommodation space. The electrical connector is disposed on a surface of the case and is electrically connected to the battery cell. The electrical connector is used for connecting with an electrical receiver of an electronic device for supplying electrical power from the battery cell to the electronic device. The switch is electrically connected to the battery cell to be selectively switched to a close-circuit-state or an open-circuit-state. The moving body is capable of moving reciprocally via the through hole. The electrical actuator assembly is connected to the battery pack via the switch to generate a driving force to move the moving body reciprocally.

Abstract: A housing has padded front and rear panels. The panels are coupled along their upper peripheries leaving their lower peripheries unattached constituting an opening. A container is removably positioned within the housing. The container has interior and exterior faces and upper, lower and side faces. A coupling is provided between the lower face and an adjacent lower edge of the interior face. The coupling is pivotable. In this manner the interior face is allowed to pivot. Operational components are provided within the container. The components include a rotatable drive shaft with a plurality of fingers, a motor for rotating the drive shaft and a follower with a ramp shaped face. The follower is adapted to be cyclically contacted by the rotating fingers to pivot the interior face against the front panel. In this manner the system will provide infant patting to the back of a wearer of the system.

Abstract: According to some embodiments, a microdermabrasion device for treating skin comprises a handpiece assembly having a distal end and a proximal end. The handpiece assembly includes at least one delivery conduit and at least one waste conduit. The microdermabrasion device additionally comprises a tip configured to be positioned along the distal end of the handpiece assembly, wherein the tip is adapted to contact skin surface. In several embodiments, the tip comprises a lip, a first opening in fluid communication with the fluid delivery conduit and a second opening in fluid communication with the waste conduit. In one embodiment, the device includes one or more abrasive elements positioned along a distal end of the tip, wherein the abrasive elements are configured to selectively remove skin as the tip is moved relative to a skin surface. In some embodiments, the delivery conduit is configured to selectively deliver at least one time-release material to the skin surface being treated.

Abstract: A massage appliance capable of synchronous kneading and tapping includes: a power-driven vertically-moving device, including an outer portion having therein a sliding channel, and a vertically-moving rack disposed alongside the sliding channel; a device capable of synchronous kneading and tapping, including a housing portion having therein a power source for driving a first transmission device whereby a second transmission device is driven to drive a rotational inclined surface structure for driving an oscillating arm to oscillate laterally; an oscillating arm coupled to a massage head support, two infrared lamp plates and two massage heads, causing the massage heads to perform kneading-based massage, the first transmission device driving a third transmission device, whereas the third transmission device driving an eccentric cam, wherein an eccentric spindle is connected to a lever weight to pull the massage head support to perform tapping, thereby allowing the two massage heads to perform tapping-based massa

Abstract: Methods to control the delivery of CPR to a patient through a mechanical CPR device are described. The method generally allows for a gradual increase in the frequency of CPR cycles. The gradual increase can be regulated by protocols programmed within the CPR device such as intermittently starting and stopping the delivery of CPR, accelerating the delivery of CPR, stepping up the CPR frequency, increasing the force of CPR, and adjusting the ratio of compression and decompression in a CPR cycle. Combinations of each of these forms may also be used to control the delivery of CPR. This manner of gradually accelerating artificial blood flow during the first minutes of mechanical CPR delivery can serve to lessen the potential for ischemia/reperfusion injury in the patient who receives mechanical CPR treatment.

Abstract: An airway clearance combines a force multiplying percussor and a self-applicator assembly. The percussor has an anvil, a hammer, a coil, and a pulse generator. The anvil has a force receiving surface and a force delivering surface. The hammer also has a force-receiving surface and a force-delivering surface, and is attached to the anvil such that the hammer's force delivering surface and the anvil's force receiving surface are mechanically free to come together or move apart. When energized with an electrical current, the coil forces the hammer's force delivering surface and the anvil's force receiving surface to separate. The pulse generator supplies pulses of electrical current to the coil.

Abstract: A vibratory attachment interface enabling transmission of oscillations generated by an oscillation source upon an external human body surface. The interface comprises a first contact node and a second contact node slideably mounted alongside the first contact node, wherein the contact nodes are each sized and shaped to enable seating within a human rib-space, and whereby upon forced engagement of the first contact node within a first rib-space, the second contact node automatically slides and conforms to the contour of a second differing rib-space thereby optimally nestling within the second rib-space. The attachment interface is for use in contoured application to preferably the anatomic left sternal border, third and fourth intercostal space, such as to enable and ensure an optimized vibratory transmission pathway from the chest wall to the base of the heart and coronary arteries thereupon.

Abstract: An apparatus for exerting force on a subject tissue includes a linear motor for generating a force according to a predetermined force profile incorporating at least one motion control parameter. The linear motor is directly coupled to a motor output member to drivingly produce linear motion of the motor output member under direction of a motor controller executing the predetermined force profile. A tissue-contacting member is connected to the motor output member for directly proportional linear motion therewith. A load cell provides load cell feedback to the motor controller. The motor controller adjusts the motion of the motor output member responsive to the load cell feedback to substantially conform the motion to the predetermined force profile. The linear motor moves the tissue-contacting member to contact the subject tissue according to the predetermined force profile and responsively initiate a subject reaction to the exerted force.

Abstract: A patting mechanism includes a support base for support a user, a driving device mounted to the support base and having a pushing unit, and a patting device having a rod pivotally connected with the support base, a patting member fixedly connected with the rod, and an elastic member connected between the support base and the rod. Thus, the rod is pushed to a preloaded position when the pushing unit is activated, and the rod is pulled by the elastic member to a patting position when the pushing unit is stopped working, such that the patting member is driven by the rod to pat on the user's back muscle repeatedly to relieve muscle soreness or help the user spit out phlegm.

Abstract: A chiropractic adjusting instrument comprising a housing; thrust nose piece an impact head to contact a body, a preload switch plunger; a dampening spring; a solenoid having a core; a preload spring; a recoil spring; an electronic pulse system operatively connected to a power source to provide alternating current for energizing the solenoid to impart impulse energy from the core to the thrust nose piece which is reproducible and independent of the power source; and a trigger system for triggering the electronic pulse system comprising a switch activated by the preload switch plunger. Preferably, the chiropractic adjusting instrument includes one or more of the following: an intelligent universal AC power converter; optimized force-time waveform; pulse mode operation; a sensing device having a sense output and a suite of electromechanical components designed to promote reproducible dynamic force impulses and safe operation.

Abstract: A handle and trigger activating a battery powered motor moving a mechanical plunger in a linear motion range. The plunger is placed against a patient's muscle, fascia, tendon, or ligament and is subjected to the repetitive mechanical plunger motion resulting in a deep massage. Plungers of differing shapes, sizes, contours, textures, and hardness may be used and are readily changed. The speed of the device is controlled by the trigger so that if more speed is desired, a user simply depresses the trigger further. Operational modes include: the device set to 30 seconds on the highest power setting, 30 seconds on a middle power setting; the device set to 20 seconds on the highest power setting, 20 seconds on a middle power setting; and the device set to 10 seconds on the highest power setting, 10 seconds on a middle power setting.

Abstract: A percussive massager is provided with a housing, a cushion, a percussive drive unit having a massage head with four spaced apart massage nodes, and a cover surrounding the massager. The nodes diametrically extend outwardly or upwardly from the exterior cushion surface to effect a rhythmic percussion to a user. The cover has at least two apertures through which the nodes protrude, and a flap extending over at least two of the massage nodes. The flap has a fastener to allow for removal of the flap from the cover. A percussive massager is also provided with a motor housing, a motor with a rotary output shaft, an elongated flexible rocker arm pivotally connected to the motor housing, and a massage node connected to an end region of the rocker arm. The flexible rocker arm deflects to provide compliance when the node contacts a massage surface.

Abstract: A rotating & tapping type massage device comprises: a base, a drive motor, a drive gear assembly, a driven member, a push member, a driven shaft and a massage member. The drive motor rotates the drive gear assembly, the drive gear assembly rotates the driven member, and then the drive member pushes the push member when rotating. The driven member is provided with skew teeth to be engaged with skew concaves formed on the push member. When the driven member rotates in different directions, it can selectively cause rotation or repeated up and down displacement of the push member, and meanwhile, the push member drives the driven shaft to move and makes the massage member disposed on the driven shaft rotate or move up and down repeatedly, so that the massage member can selectively massage in a rotation or tapping manner.

Abstract: An airway clearance combines a force multiplying percussor and a self-applicator assembly. The percussor has an anvil, a hammer, a coil, and a pulse generator. The anvil has a force receiving surface and a force delivering surface. The hammer also has a force-receiving surface and a force-delivering surface, and is attached to the anvil such that the hammer's force delivering surface and the anvil's force receiving surface are mechanically free to come together or move apart. When energized with an electrical current, the coil forces the hammer's force delivering surface and the anvil's force receiving surface to separate. The pulse generator supplies pulses of electrical current to the coil.

Abstract: The physical therapy tools, systems, kits and methods described herein may be used to apply gentle, passive and progressive amounts of pressure (including numerous repetitions of small movements) to achieve therapeutic mobilization of a spinal joint. The tools described herein may include a plurality of pads and actuators, where the pressure within each actuator is controlled so that a continuously varying pressure may be applied to mimic the pressure applied by human hands. These tools may also include a controller and one or more user inputs. The physical therapy tools may be operated at different operating modes (e.g., continuously varying pressure modes, step-pulse high frequency modes, step-pulse low frequency modes) for treating a subject's spine, and may be part of a system or kit. Methods of treating a subject using these physical therapy tools are also described herein.

Abstract: Methods to control the delivery of CPR to a patient through a mechanical CPR device are described. The method generally allows for a gradual increase in the frequency of CPR cycles. The gradual increase can be regulated by protocols programmed within the CPR device such as intermittently starting and stopping the delivery of CPR, accelerating the delivery of CPR, stepping up the CPR frequency, increasing the force of CPR, and adjusting the ratio of compression and decompression in a CPR cycle. Combinations of each of these forms may also be used to control the delivery of CPR. This manner of gradually accelerating artificial blood flow during the first minutes of mechanical CPR delivery can serve to lessen the potential for ischemia/reperfusion injury in the patient who receives mechanical CPR treatment.

Abstract: The invention relates to a shockwave apparatus for treating a human or animal body, the pneumatic drive of which comprises a motor-driven compressor. According to the invention, the rotation rate of the motor is controlled in order to set a certain compressor pressure.