Surgery – Truss – Pad
Patent
1994-08-09
1997-07-22
Rimell, Sam
Surgery
Truss
Pad
340551, A61B 506
Patent
active
056495463
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a metal detector for localizing a foreign metal body which has penetrated or has been implanted into a human or animal body.
2. Description of the Related Art
The localization of foreign metal bodies which have penetrated or been implanted into a body frequently causes unforeseen difficulties, e.g., as a result of scarring, bony concretions or a complicated position within the body. For this reason, the localization and the extraction may involve a considerable amount of work and expenditure of time.
Foreign metal bodies are considered to be metal parts which have pentrated into the body or implanted osteosynthesis materials, such as screws, nuts, tension boom wires and cerclage wires, Kirschner's wires and also so-called fixations for epitheses. The foreign metal bodies which have penetrated in this manner must be removed in order to prevent infections or other reactions of the tissue to foreign bodies.
Any implanted foreign metal body should generally be removed after a guaranteed fracture union because the points of proximal contact with the body tissue may corrode and lead to an undesired foreign body irritation, this because the implant causes an elasticity loss of the bone.
In the case of fixations, these fixations have to be localized precisely at the recovery in order to make it possible to secure the so-called epitheses thereto.
Although, for the detection of an implant, the scar of the orignal area of operation is usually circumcised, it is frequently impossible to localize the material by feeling or by means of needles because it is either covered by a scar tissue or callus layer or it may also have moved in rare cases.
According to the prior art, a radiologic representation of the material is made, for example, by means of an X-ray image converter which is slewable through 360.degree.. The disadvantage of this method is the fact that only the horizontal or vertical, i.e. the two-dimensional, position of the material is indicated successively. Consequently, only the position with respect to its width or depth is visible on the X-ray, even though the work is performed on a three-dimensional body.
In difficult cases, the location is usually determined by narrowing down the position of the foreign body by means of needles which are inserted into the tissue, i.e., an approach to the foreign body is carried out by more or less frequent X-ray exposures.
However, this method has the following disadvantages: insignificant; radiation exposure, it is compulsory to wear heavy lead rubber aprons; that the patient needs to be narcotized an equally long time, i.e. for long work periods and correspondingly long occupancy periods of operating rooms; operator and an assistant for operating the X-ray C-arc.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a metal detecting device of the type described above which permits a three-dimensional localization of foreign metal bodies in human or animal bodies and which allows a single-handed operation. In addition, the device should be suitable for stationary or mobile use.
In accordance with the present invention, the device of the above-described type includes a measuring coil member arranged in a sensor which is shaped like a pin, wherein the measuring coil member is connected to a corresponding amplifier, and wherein the output signals of the amplifier can be evaluated by means of a measuring comparator as a degree for the field influence caused by the foreign metal body.
The device constructed in accordance the present invention makes possible an exact, reliable and quick localization of foreign metal bodies in the tissue with respect to depth, length and width, irrespective of the type of metal. The device is especially useful for the medical-operative fields; however, the device can also be used wherever similar problems arise.
The single-handed operation which is indispensable for surgical use is ensured by a special circuit
REFERENCES:
patent: 4416289 (1983-11-01), Bresler
patent: 4431005 (1984-02-01), McCormick
patent: 4445501 (1984-05-01), Bresler
patent: 4526177 (1985-07-01), Rudy et al.
patent: 4905698 (1990-03-01), Strohl, Jr. et al.
patent: 4943779 (1990-07-01), Ashley-Rollman et al.
Kueffner Friedrich
Rimell Sam
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