Self-retaining retractors, i.e. Travers, Norfolk, Norwich, Balfours, Alms and Jolls have atleast two blades joined by a hinge joint or bar. It is thus possible to create lateral pressure against both margins of the wound. This helps to retain the retractor in position throughout the duration of the operation.
Thus freeing the hands of the assistant for assisting the surgeon in other ways.
Examples are:
• Travers (Fig. 8.98)
• Norfolk (Fig. 8.99)
• Balfour abdominal (Fig. 8.100)
• Joll thyroid (Fig. 8.101).
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