Abstract:
Detection device with single-hand operation for locating a metallic foreign body which has penetrated or been implanted in a human or animal body. A coil system fitted in a sensor rod (10) is connected (19) to a measuring amplifier (14), the output signals of which can be evaluated in a measurement comparator (16) as a measure of the field influence caused by the foreign body.
Abstract:
When performing the method a sensor (1) is used with a coil (15) integrated in a coil circuit. In the coil circuit a magnetic field is generated so that mutual induction can develop between the coil circuit and the surroundings of the sensor (1). The magnetic field in the coil circuit is detected intermittently, and a developed mutual induction is detected as a change of the magnetic field. The position of the sensor is monitored on the basis of said intermittent detection of the magnetic field in the coil circuit. The change of the magnetic field in the coil circuit can be detected in several ways. If the magnetic field is varying, the change may for example be detected as a change of the peak value of the voltage across or the current intensity through the coil circuit or be detected as a phase shift of one of these parameters. The method is used especially to ensure that calibration of the sensor (1) is performed only when the sensor (1) is located in a related calibration chamber (24). The detectable mutual induction is developed between the coil circuit with the coil (15) and an aluminum cup (22) constituting the calibration chamber (24).
Abstract:
Improved methods of selectively localizing, imaging and/or treating tumors, which have a net negative charge, employ novel complexes having a net positive charge. The complexes contain a polylysine, a linking agent bound to less than all of the lysyl groups of the polylysine, and an imaging agent or a chemotherapeutic agent which is also bound to the linking agent.
Abstract:
A measurement probe (1) contains a self-adjusting oscillating circuit with a measurement coil (5) and a retroactive coil (6). The measurement coil forms part of an LC oscillating circuit. The oscillator is tuned so that the oscillation periodically ceases and is excited again only after a certain delay time. The measurement parameter is the (low) frequency of the oscillation periods. When the probe (1) approaches the metallic part, the oscillating circuit is damped. The resultant frequency shift of the oscillation periods is measured by an evaluation and indicated optically and/or acoustically or used for control purposes. A metallic object can thus be loacted rapidly and reliably by a probe of small dimensions.
Abstract:
This apparatus which shows the place of the temporary pacemaker electrodes or similar conductors put in the veins or arteries and moved to the heart, compares the signals coming from ECG (electrokardiogram) and ICG (intracardiac-electrocardiogram) or second ECG amplifiers in a logic circuit and indicates the results as ventricule or atrium with the twinkles of two different LEDs or in graphics on a screen.
Abstract:
The system is designed to locate or detect if in a surgical operation compresses or surgical instruments have been forgotten inside the patient. The system comprises the incorporation of a receiver in the compresses, said receiver being formed of a coil and a capacitor for generating an electric current induced when the receiver is subjected to the electromagnetic field created by an external emitter provided with means for setting in operation the receiver and with a coil connected to a capacitor, so that the self-induced current created in the receiver when stopping the electromagnetic field is detected by the emitter itself, thus generating in the emitter a current capable of activating a supply circuit for a light and/or acoustic signalling device which forms part of the emitter itself, to indicate, in the case of activation, the existence of the surgical compress inside the patient who has been operated.
Abstract:
A system (10) for externally locating a sensor in tissue, comprising an external probe including at least first and second electromagnetic output coils (12) with non-parallel longitudinal axes; and output coil (2) driver for alternately energizing the first and second output coils, for generating a time-varying magnetic field which penetrates the patient's skin (7); a sensor coil (30), having a longitudinal axis, for developing an induced electrical voltage in response to the time-varying magnetic field; a distance determinator, responsive to the induced voltage from the sensor coil (30), for determining from the induced voltage, the distance between the output coils (12) and the sensor coil (30), independently of the relative angle, in a horizontal plane, between the sensor coil (30) longitudinal axis, and the longitudinal axes of the output coils (12); and a direction determinator for determining and displaying the direction, in the horizontal plane, in which the sensor coil (30) longitudinal axis is pointing.
Abstract:
The present invention relates to a method and apparatus used to place a catheter (100) having a distal end (106) and a proximal end (102, 104) where the proximal end cannot be trimmed within a patient. The method and apparatus utilize a device operative in locating the tip of a catheter, which includes a detector assembly (200) having a detector (220) and a locator (240). The detector (220) of the detector assembly (200) is locked into position remote from the distal end (106) of the catheter (100) prior to inserting the catheter in the patient. The distal end of the catheter (100) is trimmed, as to define a trimmed distal end, the detector (220) is then unlocked and placed proximate the trimmed end. In the preferred embodiment the detector (220) is locked into place proximate the trimmed distal end and the catheter (100) is placed within the patient.
Abstract:
The invention is directed to a guide wire apparatus and a method for detecting the location of a guide wire within the body of a patient. The apparatus includes a guide wire with an internally-housed sensing member. The guide wire assembly is structured to provide the response, maneuverability and tactile feel comparable to conventional guide wire devices. The apparatus is useful in medical treatments and diagnoses such as angioplasty or catheterization procedures, for detecting obstructions within a blood vessel of a patient, and the like.
Abstract:
Apparatus for detecting a surgical implement (20) in human or animal tissue comprises a detector (8) responsive to the presence, within an interrogation zone (10), of a surgical implement (20) to which a marker (18) is secured. The marker (18) is adapted to produce identifying signal characteristics within a frequency band generated in the interrogation zone (10). Variations in the phase and/or direction of the interrogating field and changes in the electromagnetic coupling between markers (18) and receiver (25) optimize coupling therebetween.