Patent ID: 8753115

Claim:
A device for the amelioration of a recess, in a porous, perforate material having cavities freed by the recess, said device comprising an element for generating or coupling in mechanical energy in the form of ultrasonic oscillations in the frequency range of 10 kHz-100 MHz, a guide pin with a circular cylindrical jacket surface having an external pin diameter and proximal and distal ends, an amelioration sleeve with a circular cylindrical jacket surface having an external sleeve diameter and proximal and distal ends, said amelioration sleeve surrounding said guide pin in the area of distal the end thereof directed toward the bottom of said recess and said amelioration sleeve being made from a material that can be liquefied by mechanical energy in the form of ultrasonic oscillations in the frequency range of 10 kHz-100 MHz, and a cylindrical collar with a cylindrical jacket surface having an external diameter and having a central recess for receiving said guide pin, wherein said distal end of said guide pin protrudes through, extends past and is uncovered beyond the distal end of the amelioration sleeve, wherein said guide pin is provided to be inserted as far as the bottom of said recess before mechanical energy is applied, and wherein said uncovered external pin diameter at the distal end of said guide pin and beyond said amelioration sleeve is the same or smaller than in the region where it is surrounded by said amelioration sleeve, wherein said external sleeve diameter is the same as said external collar diameter, and the same as an internal diameter of the recess to be ameliorated wherein the guide pin is received movably in the central recess such that, when said mechanical energy is applied, the collar can be moved relative to the guide pin in the direction toward the bottom of the recess while liquefying and laterally or longitudinally displacing the material of the amelioration sleeve, and such that the guide pin can be removed with the collar from the recess when the amelioration sleeve has been liquefied and laterally or longitudinally displaced into said cavities freed by the recess, and wherein said collar, at its distal end, has a circumferential distal edge tapering from said external collar diameter toward said distal end, wherein this distal edge is either straight, and therefore conical, or curved, namely concave or convex, or has a radially stepped design at the distal end, wherein the circumferential distal edge is arranged at the step transition, and wherein said amelioration sleeve is a simple hollow cylinder.