Coupler and surgical device with collar for covering a sterile flexible wrapper

A coupler for sterile coupling of a percutaneous surgical instrument to a rotational driving tool, extending along a coupling axis, said coupler comprising:

• a distal portion configured to be connected removably to the percutaneous surgical instrument,
• a proximal portion configured to be connected removably to the rotational driving tool,
• a central portion arranged between the distal and proximal portions, the central portion comprising:
• a connecting body arranged between the distal and proximal portions,
• a bearing collar extending from the connecting body, transversely to the coupling axis and configured to axially deform a distal end of a flexible wrapper surrounding the rotational driving tool when the proximal portion is connected to this rotational driving tool,
• a retaining collar extending along the coupling axis at least partially covering the proximal portion so as to be able to keep the distal end of the flexible wrapper between the retaining collar and a housing of the rotational driving tool when the proximal portion is connected to the rotational driving tool, the retaining collar extending from one end of the bearing collar to form an annular space around the proximal portion configured to receive the distal end of the flexible wrapper along the coupling axis,
• wherein the bearing collar forms, with the retaining collar, the overall shape of a U, and
• wherein the coupler forms a unit accessory in which the distal, proximal and central portions are secured to one another.