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Adapter assembly for use with a cranial biosensor
| Details |
Inventors: Ullrich, Georg J.; Pomorin, Karl-Heinz; Kronberg, Harald; Bramm, Gunter; Koschke, Peter; Novak, Pavel; Gaab, Michael R.;
Assignee: Hellige GmbH (Freiburg, DE)
Primary Examiner: Howell; Kyle L.
Assistant Examiner: Sykes; Angela D.
Attorney, Agent or Firm: Whitfield; Edward J.
Disclosed is an adapter assembly for accurately positioning a removable biosensor implanted in the cranium or skull cap. The assembly comprises an outer sleeve member insertable into a hole bored through the skull cap and an inner sleeve member coaxial with the outer sleeve. The sleeve members are constructed so as to permit slidable insertion and removal of the biosensor and to ensure accurate, tilt-free alignment thereof, thus enabling precise, error-free measurement. |
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DETAILED DESCRIPTION This invention provides an improved adapter assembly for accurately positioning a removable biosensor, having a cylindrical body portion, in a stepped circular hole bored through the cranium, the upper portion of said hole having a larger diameter than and coaxial with the lower portion so as to form a radial bearing surface intermediate said upper and lower portion, said adapter assembly comprising: (a) a first tubular member adapted for insertion into said hole, the upper portion of which tubular member is formed as a radially extending flange adapted to the inside diameter of the upper portion of the hole, the lower portion of which tubular member formed as a plurality of downwardly depending spring-like legs adapted to the inside diameter of the lower portion of the hole, the lower tips of said legs formed as outwardly extending cams; and (b) a second tubular member adapted for insertion into the first tubular member, the upper portion of which is formed as a radially outwardly extending flange adapted to the inside diameter of the upper portion of the first tubular member, the lower portion of which is adapted to the inside diameter of the lower portion of the first tubular member, the inside diameter of the second tubular member being slightly larger than the outside diameter of the biosensor such that the biosensor is slidable therein, whereby when the second tubular member is inserted into and coaxially aligned with the first tubular member the spring-like legs are urged into contact with the cranial wall defined by the lower portion of the hole and the outwardly extending cams engage the lower outer periphery of the cranium defined by the lower portion of the hole.
In accordance with the assembly of this invention, no uncontrollable additional pressure forces arise in the region of the peripheral lower edge of the sensor, that is to say in the region of the membrane.
The sensor does not have to be screwed in or secured by a bayonet closure.
Simple pushing into the applicator assembly suffices
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