| 摘要 |
The invention relates to a medical instrument ( 20 ) comprising a lower plate ( 22 ); at least one upper plate ( 24 A, 24 B) opposite the lower plate; a spacer means ( 26 ) which is disposed between the upper plate and the lower plate and used to permanently hold the upper plate is a substantially parallel position in relation to the lower plate and to move the upper plate away from the lower plate, said means being fully contained between the upper and lower plate, the minimal spacing between the outer surfaces of the upper plate and lower plate being less than 10 millimetres; and flexible control means connected to the spacing means
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