Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-07-17
1999-04-06
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604283, 606130, A61M 2502
Patent
active
058911006
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a device for holding and sealing a brain scan probe threaded into a cranial opening and forming a seal with the opening.
BACKGROUND OF THE INVENTION
A device of this kind is known from the brochure Calif., U.S.A.
The Camino ICP Monitoring KIT.
The device shown serves for the insertion of a probe in the form of a catheter which measures the brain pressure in the tissue and which, after a screw has been fixed in the cranial perforation, is inserted through the protective flexible tube and the screw passage bore into the brain tissue to the required scanning depth. The probe in this known construction has an adequate natural rigidity to enable it to be advanced while being aimed toward the target without any deviations in the direction predetermined by the passage bore. When the insertion position is reached, the probe is fixed on the screw by a pinch seal, with sterile closure of the passage bore. In this construction, the protective flexible tube provides only protective action against lateral incursions on the probe. An electric coupling plug provided at the proximal end of the probe is rigidly connected only to the probe, which in the known construction has sufficient resistance to tension.
The known device offers the possibility of providing a patient with a brain probe over a relatively long period, the brain being protected against infection and the external part of the probe being movable arbitrarily, for example in the event of the patient's shifting, without any risk of electrical malfunction.
There has long been the need to carry out long-term measurements of the tissue pO2, i.e., the oxygen partial pressure in the tissue, in the brain. Probes in the form of catheters suitable for the purpose are available, e.g. Clark type oxygen measuring probes. Probes of this kind suitable for use in brain tissue, however, must be extraordinarily thin and highly flexible, since otherwise they cannot follow the tissue movements during the natural movements of the brain (respiration, pulse beat) and they would injure the tissue. On the one hand, injuries of this kind are harmful to the brain and on the other hand they falsify the oxygen measurement.
With known devices it is not possible to introduce such probes into the brain tissue, since they do not have sufficient natural rigidity for progress into the brain tissue and because they are not sufficiently tension-resistant, so that they would break between the coupling plug and the screw in the event of movements by the patient or manipulation being carried out on the patient.
SUMMARY OF THE INVENTION
An object of the present invention, therefore, is to provide a device of the kind referred to in the preamble of use for oxygen probes suitable in brain tissue.
The highly flexible pO2 probe offers the advantage of enabling the oxygen pressure in the brain tissue to be measured, and in fact without injury to the brain tissue or falsification of the measurement by such injuries. Once the probe has been placed in the tissue, it can passively follow all the movements of the brain tissue. To introduce the probe into the brain tissue, an insertion catheter is provided, which is of sufficient natural rigidity or which is kept naturally rigid during insertion by means of a guide wire, the insertion catheter surrounding the probe during the advance and guiding it in the required direction. From its proximal end, the insertion catheter must be displaceable independently of the probe for the purpose of insertion or subsequent withdrawal with the probe being released in the brain. The known pinch seal directly between the screw and the probe cannot therefore be used. On the contrary, the pinch seal seals on the insertion catheter and, with this, which for this purpose is selected from suitable material, on the probe. An electric coupling plug provided at the proximal end of the probe is connected to the screw in tension-resistant relationship via the protective flexible tube so that breaking away of the extremely sensitive
REFERENCES:
patent: 4903707 (1990-02-01), Knute et al.
patent: 5112312 (1992-05-01), Luther
Farley Walter C.
McDermott Corrine M.
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