Abstract: Medical device and secure control system (1) comprising a wearable medical device (2) and a medical device controller (4), the medical device controller (4) comprising a communications module (17) including at least a short range wireless communications capability for communication with a consumer electronic device (12) including any one or more of a smartphone, a personal computer, a smartwatch and a computer tablet, the medical device controller (4) further comprising a memory (14) storing a computer program and encryption keys configured to establish an encrypted communication with the consumer electronics device, and a processor (15) configured to execute the computer program, the medical device controller (4) and the medical device (2) storing each at least one journal (16) for exchange of journal entries between the medical device controller (4) and the consumer electronic device and between the medical device controller (4) and the medical device (2), the journal entries comprising user identification,

Abstract: Method of operating a medical device and secure control system (1) comprising a medical device (2) and a medical device controller (4), the medical device controller comprising a communications module (17) including at least a short range wireless communications capability for communication with one or a plurality of consumer electronic devices (12) including any one of a smartphone, a personal computer, a smartwatch and a computer tablet, wherein each of the medical device (2) and the medical device controller (4) comprises a memory storing one or a plurality of journals (16) for exchange of journal entries between the medical device controller (4) and the medical device (2), and between said medical device controller (4) and said one or a plurality of consumer electronic devices, the at least one journal (16) stored in the medical device controller (4), the consumer electronic device (12), and the medical device (2), said at least one journal comprising past instructions exchanged between the medical device

Abstract: The generator for a piezoelectric motor is also suitable for powering a high power LED for a dental polymerisation lamp via a rectifier, and comprises two transformers each including a primary winding and a secondary winding and four switches controlled by an ultrasonic reference oscillator, two switches being arranged to alternately connect the secondary windings of the two transformers to the piezoelectric load, and the other two switches being arranged to alternately connect the two primary windings to a voltage supply so that during the positive alternation, the primary winding of one of the transformers is charged with energy whereas the secondary winding of the other transformer is discharged into the piezoelectric load, and so that during the negative alternation, the secondary winding of the first transformer discharges the energy thereof whereas the primary winding of the first transformer is charged.

Abstract: The generator for a piezoelectric motor is also suitable for powering a high power LED for a dental polymerisation lamp via a rectifier, and comprises two transformers each including a primary winding and a secondary winding and four switches controlled by an ultrasonic reference oscillator, two switches being arranged to alternately connect the secondary windings of the two transformers to the piezoelectric load, and the other two switches being arranged to alternately connect the two primary windings to a voltage supply so that during the positive alternation, the primary winding of one of the transformers is charged with energy whereas the secondary winding of the other transformer is discharged into the piezoelectric load, and so that during the negative alternation, the secondary winding of the first transformer discharges the energy thereof whereas the primary winding of the first transformer is charged.

Abstract: The generator for a piezoelectric transducer, in particular for a piezoelectric motor for medical or dental applications, comprising two transformers (11A, 11B) each including a primary winding (L1) and a secondary winding (L2), and four switches (19A, 19B, 21A, 21B) driven by an ultrasonic frequency oscillator, two of said four switches (21A, 21B) being designed to connect alternately the secondary of each transformer to the piezoelectric load (5), and the two other switches (19A, 19B) being designed to connect alternately the two primary windings to a power supply (17) so that during a first half cycle, called “the positive half cycle” the primary winding of one of said two transformers is charged with power, while the secondary winding of the other transformer discharges power to the piezoelectric load, and so that during a second half cycle, called “the negative half cycle” the secondary winding of said one transformer discharges power to the piezoelectric load, while the primary winding of the other tran

Abstract: The generator for a piezoelectric transducer, in particular for a piezoelectric motor for medical or dental applications, comprising two transformers (11A, 11B) each including a primary winding (L1) and a secondary winding (L2), and four switches (19A, 19B, 21A, 21B) driven by an ultrasonic frequency oscillator, two of said four switches (21A, 21B) being designed to connect alternately the secondary of each transformer to the piezoelectric load (5), and the two other switches (19A, 19B) being designed to connect alternately the two primary windings to a power supply (17) so that during a first half cycle, called “the positive half cycle” the primary winding of one of said two transformers is charged with power, while the secondary winding of the other transformer discharges power to the piezoelectric load, and so that during a second half cycle, called “the negative half cycle” the secondary winding of said one transformer discharges power to the piezoelectric load, while the primary winding of the other tran

Abstract: In a surgical instrument for the mechanical removal of bone cement (2), comprising a longitudinal housing (4) with a cylinder (6) in which a piston element can be reciprocated by a drive means (14), wherein the piston element on the distal end (18) of the cylinder (6) exerts an impact on a chisel tool supported axially in the housing (4), it is provided that the piston element (10) comprises a projectile (10) adapted to be accelerated to a high final speed and inducing a shock wave into the chisel tool comprising a metallic shock wave transmission probe (22), the probe tip (26) of the chisel tool transmitting the shock wave to the bone cement (2) at a low movement amplitude of the probe tip (26).

Abstract: An ejection apparatus for the high pressure ejection of a liquid. The apparatus has the following elements: (a) a pressure chamber for containing the liquid; (b) an ejection opening communicating between an outside and an inside of the pressure chamber; (c) a working piston displaceable in the pressure chamber from a first position at a beginning of a working stroke to second position at an end of the working stroke, having (1) a first end defining a first volume within the pressure chamber when the working piston is at the first position and displacing a second volume, less than the first volume, when the working piston moves from the first position to the second position, and (2) having a second end distal from the first end; and (d) a drive for driving the working piston including (1) an impact member for elastically impacting the second end of the working piston to cause the working piston from the first to the second position and (2) means for accelerating the impact member to impact the working piston.