received by the International Bureau on 22 June 2014 (22.06.2014)

1. A method of producing nanocrystalline titanium, in particular for medical implants, in which a coarse-grained titanium semi-product with the pure titanium content above 99wt% is subjected to plastic treatment, characterized by that the plastic deformation consists of reducing the transverse cross-section surface area of the titanium semi-product (1) by hydrostatic extrusion in which this semi-product is the billet (1) which is extruded through the die (4), with the reduction of the cross-sectional surface area of the titanium billet being realized during not less than three consecutive hydrostatic extrusion passes and not more than five consecutive hydrostatic extrusion passes in which the initial temperature of the billet (1) in any of the passes does not exceed 50°C, the extrusion rate in any of the passes does not exceed 50 cm/s, the titanium billet (1) is, prior to each hydrostatic extrusion pass, covered with a friction-reducing agent, and the reduction (R) of the transverse cross-section surface area of the titanium semiproduct during the first hydrostatic extrusion pass is at least four whereas during the second and third hydrostatic extrusion passes the reduction is at least two and a half.

2. The method according to Claim 1 wherein the friction-reducing agent is a copper lubricant in an aerosol.

3. The method according to Claim 1 or 2, wherein the product (1') of the hydrostatic extrusion that leaves the die (4) is cooled with cold tap water.

4. The method according to one of Claims from 1 to 3, wherein the number of hydrostatic extrusion passes is at least four, the reduction (R) of the transverse cross-section surface area of the titanium billet (1) during the first hydrostatic extrusion pass ranges from 4.0 to 4.1 , during the second and third passes the reduction (R) of the transverse cross-section surface area of the titanium billet (1) ranges from 2.75 to 2.85, and during the fourth hydrostatic extrusion pass the reduction (R) of the transverse cross-section surface area of the titanium billet (1) ranges from 2.05 to 2.15.

5. The method according to Claims 4, wherein in any of the hydrostatic extrusion passes, the extrusion velocity does not exceed 15 cm/s.

6. The method according to one of Claims from 1 to 5, wherein after the completion of the hydrostatic extrusion process, the titanium product obtained (1') is subjected to a finishing treatment which is preferably rotary swaging.

7. A titanium medical implant made of titanium with the pure titanium content of at least 99wt%, characterized by that the material of the implant has a nanocrystalline structure with an average grain size below 100 nm and its yield stress exceeds 1000 MPa.

8. The titanium medical implant, according to Claim 7, wherein the material of the implant is produced using the method according to any of the Claims from 1 to 6.