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Process for producing an artificial cranium and a prosthetic head

  • US 4,708,836 A
  • Filed: 03/20/1986
  • Issued: 11/24/1987
  • Est. Priority Date: 03/22/1985
  • Status: Expired due to Fees
First Claim
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1. A process for producing an artificial cranium by moulding a first material in a mould which is in several parts, said cranium having at least one cavity, wherein it comprises the following stages:

  • (a) determining the compression modulus of elasticity at different points of a fresh cranium,(b) calculating the equivalent thicknesses of the first material, so that the compression strength is the same at each considered point,(c) producing a model cranium with the thus calculated equivalent thicknesses, said model cranium having a cavity corresponding to that of the cranium to be produced,(d) taking an external impression of the model cranium in two stages in order to obtain a two-part mould,(e) taking an impression of the cavity of the model cranium in order to obtain a first core, stages (d) and (e) being performed simultaneously,(f) eliminating the model cranium,(g) taking an impression of the first core to obtain a countermould,(h) producing in said countermould a second core of a second material, which can be selectively eliminated with respect to the first,(i) placing the second core in one of the mould parts by orienting it using appropriate positioning means,(j) closing the mould by assembling its different parts,(k) introducing the first material into the mould,(l) allowing the first material to harden,(m) separating the different parts of the mould, and(n) eliminating the second core.

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