Interspinous implant and instrument for implanting an interspinous implant

An interspinous implant for implantation between a first dorsal spine and an adjacent second dorsal spine comprising:

• a body elongated along a longitudinal axis and comprising a top and a bottom,
• a right end,
• an upper wing disposed proximal to the right end of the body and extending away from the top of the body in a direction generally transverse to the longitudinal axis,
• a lower wing disposed proximal to the right end of the body and extending away from the bottom of the body in a direction generally transverse to the longitudinal axis, and
• a passage having an opening on the right end of the body;
• a retainer comprising
• an elongated upper arm having a free end and a pivot end articulated about an axis, and
• an elongated lower arm having a free end and a pivot end articulated about an axis, with
• the retainer having
• an insertion position in which the upper arm and the lower arm are folded toward each other to form a profile that allows transit of the free ends of the upper and lower arms into the passage through the opening, and
• an implant fixation position in which the upper arm and the lower arm are unfolded with the upper arm extending from the passage with the free end above the top of the body and the lower arm extending from the passage with the free end below the bottom of the body.