Device and method for taking digitisation impressions for generating a 3D model of a femoral prosthesis socket

A method for generating a 3D model of a femoral prosthesis socket for a patient with a view to computer aided design thereof, the method comprising a step of taking digitisation impressions comprising the following steps:

• marking at least one reference point on the remaining part of an amputated limb,
• 3D digitisation of the remaining part of the amputated limb by means of a scanner and obtaining a first 3D digital model,
• installing, on the remaining part of the amputated limb, a device comprising a base, at least two transparent tongues secured to the base and means for clamping the tongues on the remaining part of the amputated limb,
• positioning said device by positioning a top edge of one of the tongues at the anterior edge of the ischium and obtaining the position of the ischium (Is),
• clamping the means for clamping to compress the soft tissues of the remaining part of the amputated limb with the tongues, and obtaining compression regions of the soft tissues,
• 3D digitisation of the remaining part of the amputated limb fitted with the device and obtaining a second 3D digital model,
• superimposing the first and second 3D digital models obtained by aligning the reference points of each 3D digital model,
• keeping on the top part of the second 3D digital model on which the anterior edge of the ischium and the compression regions of the soft tissues are visible, eliminating the remaining bottom part of the second 3D digital model and obtaining a truncated second 3D digital model,
• keeping on the bottom part of the first 3D digital model to allow reconstitution of the amputated limb, and eliminating the top part of the first 3D digital model,
• generating a complete 3D digital model based on the bottom part of the first 3D digital model and the top part of the second 3D digital model.