Abstract:
A method for rinsing a field of inspection or operation during an endoscopic procedure includes filling a proximal portion of a conduit with a fluid quantity defining a slug of liquid and accelerating the slug of liquid using gas which is fed into the conduit upstream of the fluid quantity, so as to have the slug of liquid discharged from the conduit at a high speed.
Abstract:
A self-cutting trocar pin is provided near its distal end with active cutting tools, operated manually or motor driven. Therefore, the force which is normally needed to insert the trocar into a body is greatly reduced, and the insertion can be done under control to avoid the risk of injury during penetration of the abdominal wall. A gas flow sensor indicates opto acoustically, in connection with an opening near the distal end of the trocar pin, the penetration of the abdominal wall. The cutting tool of the trocar pin maybe, for example, a disc shaped blade, a chain knife, or manually operated straight blades.
Abstract:
An apparatus is described for locating objects within the body, and particularly concretions situated in body cavities, in three dimensions and for destroying them. The point of departure for this is an electro-acoustic treatment transducer for generating shock waves to be emitted to focus on the object concerned and a B-scanner connected to the treatment transducer to act as a locating transducer for locating the object, the locating transducer being adjustable relative to the treatment transducer co-focally therewith. The design proposed envisages the locating transducer being integrated into the treatment transducer so that the sound fields of both transducers travel the same distances through the same media and it is thus the correct position of the focus relative to the concretion seen in the image which is in fact shown.
Abstract:
In a lithotriptor a shock wave transducer is provided with a focussing cup and with a forward section containing a coupling medium shut off by means of a diaphragm for application to a patient's body. In the wall of the cup there is mounted a locating system comprising an x-ray emitter the outlet of which is located in the coupling medium. The outlet is closed by means of a balloon which can be filled with gas and which can be evacuated. When the balloon is filled with gas, it expands in the direction of radiation of the x-rays up to or almost up to the diaphragm of the forward section.
Abstract:
Apparatus for dissolving concretions within a bodily cavity, for example in the gall bladder, under the action of a solvent fluid applied within the bodily cavity, comprises an ultrasonic transducer arranged to be coupled to the exterior of the patient's body and to be focussed on selected parts of the bodily cavity. The transducer emits ultrasonic waves within a frequency range of between 20 and 40 kHz and with just enough power to generate cavitations in bodily cavity fluid within the body cavity, or in the solvent fluid, or in both of these fluids to cause dispersion therebetween.
Abstract:
This disclosure relates to the determination of blood loss during endoscopic operations, particularly, during transurethral resectomy. It is known in such operations to employ continuous irrigation using sterilized water which is fed into the body cavity through the endoscope and fed out again mixed with the lost blood. According to the disclosure a method is provided wherein the specific blood content is found from one of the characteristics of the outgoing water which alters with the blood content: to determine the blood lost this specific blood content is compared with the rate of flow of the monitored outgoing flushing water.
Abstract:
This invention relates to apparatus for measuring the rate of flow F(t) of urine electrically using a measuring vessel whose filled volume V at any particular time is measured as a function V(t) of time t, so that the rate of flow F(t) = dV/dt of the urine can be obtained by differentiating the time function.In such apparatus, there is provided at least one electrical capacitor which is acted on by the amount of urine in the vessel and whose capacitance C(t) is influenced by the time-dependent amount of urine present, the urine acting both as an electrical conductor and as a di-electric, and the capacitance being used as an indication of the filled volume function which is to be differentiated electrically.
Abstract:
A lithotripsy ultrasound locating device comprises at least one locating transducer having a plurality of focal ranges and which is associated with a therapy transducer and is axially adjustable in relation to its focus; a position indicator which generates a signal representing the distance between the sound head of the locating transducer and the focus of the therapy transducer; a computer; a monitor on which a target mark representing the focus of the therapy transducer is displayed; and an electronic transmitter/receiver arrangement controlled by the computer in order to produce an image of a concretion to be destroyed which image is constantly optimal. The computer, controls, as a function of the signal emitted by the position indicator and by way of the transmitter/receiver arrangement, the focal range of the locating transducer which, at the given distance at that moment between the sound head and the focus of the therapy transducer always lies in the range thereof. The computer further generates a signal following up the target mark on the monitor according to the signal emitted by the position indicator. The following-up signal is passed to the monitor so that, where applicable, in each axial position of the locating transducer, the image of the concretion displayed by the monitor lies in the target mark.
Abstract:
A device for locating and disintegrating concretions and stones in bodily cavities by means of a shock wave generator comprises a reclining surface for the patient, with an opening therein below which the generator, including a flexible precursor section, is so arranged that the fluid sealed off from the outside is in contact via the opening with the body section to be treated, either directly or indirectly via a diaphragm sealing off the precursor section. To this end, the reclining surface and the shock wave generator are displaceable with respect to each other.
Abstract:
This invention relates to lighting systems for use during surgical operations or examinations.The device comprises a bundle of optical fibres having an intake area into which the light from an ellipsoidal mirror having a lamp therein can be beamed. A concave lens area located in an area facing away from the optical fibre bundle is co-axially situated forwardly adjacent the light intake area of the fibre bundle.The concave area may be formed by grinding out portion of a transparent plate and the light from the mirror may be concentrated by an aspheric lens between the mirror lamp and the lens area.