Patent ID: 9351801
Filing Date: 2016-05-31
CPC Classification: A61C

Claim Text:
1. Dental hand instrument having an elongate handle sleeve, at a front end of which there is disposed a tool holder for holding a treatment tool, there being disposed inside the elongate handle sleeve a driving mechanism for driving the treatment tool, the driving mechanism having two rotatably mounted shafts that are coupled to each other, and wherein a one-piece sealing element is disposed in a coupling region of the two rotatably mounted shafts inside the elongate handle sleeve, wherein the sealing element is enclosed within the elongate handle sleeve, the sealing element having a first cylindrical extension which is receivable in a cylindrical bore of the dental hand instrument, the first cylindrical extension having a first axis that is aligned with a first shaft of the two rotatably mounted shafts, the sealing element further having a second cylindrical extension configured to form a seal against a receiving sleeve for a second shaft, the second cylindrical extension having a second axis that is aligned with the second shaft of the two rotatably mounted shafts, and the first axis and second axis are oriented at a non-zero angle with respect to one another, the sealing element further having a cylindrical lateral surface spaced apart from the first cylindrical extension, and wherein the sealing element includes two segment-type recesses disposed in a lower region of the cylindrical lateral surface, the two segment-type recesses forming a cut-out portion of the cylindrical lateral surface proximate the second cylindrical extension.