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26A: A surgical technique to check haemorraging
7 Letters> *O*S*O*

Torsion

torsion
ˈtɔːʃ(ə)n/Submit
noun
the action of twisting or the state of being twisted, especially of one end of an object relative to the other.
the twisting of the cut end of an artery after surgery to impede bleeding.

I thought it might be torsion, but my dictionary didn't show any medical connection.
Thanks again,

Cresson

Few dictionaries do show that definition but my Chambers has it.