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US 12,678,028 B2Granted
Reversal system for a surgical instrument
AssigneeOlympus Winter & Ibe GmbH
InventorJianxin Zhao
Life of this patent
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Abstract
A reversal system for a surgical instrument including: first and second outer achromats each having, first and second lenses, and first and second inner achromats arranged between the first and second outer achromats. Each of the first and second inner achromats having first and second lenses. A first pair of the first outer achromat and the first inner achromat being arranged symmetrically with respect to a second pair of the second outer achromat and the second inner achromat.
Claims12
A reversal system for a surgical instrument comprising:
- first and second outer achromats each having, first and second lenses, and
- first and second inner achromats arranged between the first and second outer achromats, each of the first and second inner achromats having first and second lenses, a first pair of the first outer achromat and the first inner achromat being arranged symmetrically with respect to a second pair of the second outer achromat and the second inner achromat, wherein the reversal system satisfies the following condition
- L
- *
- NA
- 2
- D
- 2
- *
- (
- Φ
- RM
-
- S
- +
- ❘
- "\[LeftBracketingBar]"
- PTZ
- ❘
- "\[RightBracketingBar]"
- 10
- )
- >
- 5
- ,
- wherein
- L is a length of the reversal system/mm,
- NA is a numerical aperture,
- D is an outer diameter of the reversal system/mm,
- ΦRMS is the minimum RMS (Root Mean Square) spot diameter at a center/mm,
- |PTZ| is an absolute value of a (third order) curvature of a Petzval surface, wherein PTZ is given by the formula
- PTZ
- =
- -
- S
- 4
- I
- 2
- ,
- wherein S4 is a Petzval sum (third order) and I is a Helmholtz-Lagrange invariant.
37 more elements
Dependencies are inferred from the claim text.