When developing the Külling laminectomy punch, we asked how to minimise deflection of the tip and therefore facilitate its control.
This is particularly important in the sensitive spine area, in order to minimise the potential risk of dural lesions.
The disadvantage of the traditional handle design of a conventional laminectomy punch is not evident at first sight: the handle requires rotation of the fingers, which causes the punch tip to deflect. This means the tip is not always under optimal control.
We developed a different handle design, where the fingers move in a more translatory way.
The Külling laminectomy punch can be dismantled to enable optimal cleaning. The Külling laminectomy punch is colour-coded to identify the jaw width:
1mm jaw width - black handle
2mm jaw width - red handle
3mm jaw width - blue handle
4mm jaw width - green handle
5mm jaw width - orange handle
The Külling laminectomy punch is available in different lengths:
20 cm, 23 cm, 27 cm and 30 cm
The jaw comes in standard shape or flat-foot shape (flat shoe).
The force analysis shows a better input/output force ratio from the Külling laminectomy punch. For a given force output (punching), a lower force input is required.
The torque curve of the Külling model is easier to follow qualitatively than that of the conventional model.
The empirical tests and mechanical analysis show that the punch can be held more precisely in position when closing. This is significant for all three movement types (up/down, forwards/backwards and left-right; see table).
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