Device and method for the amelioration of recesses

A method for the amelioration of a recess in a porous, perforate material having cavities freed by the recess, in a foam or wood material, or a human or animal bone, comprising:

• providing a 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 shaped as a simple hollow cylinder with a circular cylindrical jacket surface having an external sleeve diameter and proximal and distal ends, said amelioration sleeve surrounding said guide pin in an area of the distal end of the guide pin and directed toward a bottom of said recess, and said amelioration sleeve being made from a material that can be liquefied by mechanical energy in the form of said ultrasonic oscillations in the frequency range of 10 kHz-100 MHz, and
• a cylindrical collar with a cylindrical jacket surface having an external collar diameter and proximal and distal ends, 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 at a portion 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 said mechanical energy is applied, and wherein said uncovered portion of the guide pin has an external pin diameter at the distal end of said guide pin and beyond said amelioration sleeve that is the same or smaller than in a region where said guide pin 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 the collar distal end, has a circumferential distal edge tapering from said external collar diameter toward said collar distal end, wherein said 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 stepped transition, and
• pushing the device, with said guide pin and said amelioration sleeve, into the recess which has an internal diameter corresponding substantially to the external diameter of collar and amelioration sleeve, until the guide pin abuts against the bottom of the recess and/or engages in a guide taper arranged at the bottom of the recess, and then,
• simultaneously liquefying the amelioration sleeve by applying ultrasonic oscillation,
• whereby with pushing of the distal end of the collar into the recess, liquefied material is introduced into lateral cavities, adjoining the recess, and then
• screwing a self-tapping or non-self-tapping implant or a self-tapping or non-self-tapping screw into the ameliorated recess.

A method for the amelioration of a recess in a porous, perforate material having cavities freed by the recess, comprising:

• providing a 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 in the form of a simple hollow cylinder 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 a bottom of said recess, and said amelioration sleeve being made from a material that can be liquefied by mechanical energy in the form of said ultrasonic oscillations in the frequency range of 10 kHz-100 MHz, and
• a cylindrical collar with a cylindrical jacket surface having an external collar diameter and proximal and distal ends, 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 at a portion 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 said mechanical energy is applied, and wherein said uncovered portion of the guide pin has an external pin diameter at the distal end of said guide pin and beyond said amelioration sleeve that is the same or smaller than in the region where said guide pin 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;
• pushing the device, with said guide pin and said amelioration sleeve, into the recess which has optionally been pre-drilled and which has an internal diameter corresponding substantially to the external diameter of collar and amelioration sleeve, until the guide pin abuts against the bottom of the recess and/or engages in a guide taper arranged at the bottom of the recess,
• liquefying the amelioration sleeve by the application of said ultrasonic oscillations, whereby the simultaneous liquefying of the amelioration sleeve and pushing of the distal end of the collar into the recess, causes liquefied material to be introduced into lateral cavities, adjoining the recess,
• wherein, when the sleeve is pushed fully down into the recess to contact the bottom of the recess, the liquefied sleeve material is introduced completely into the lateral cavities over a full length of the recess;
• and
• subsequently removing the device with the pin and the collar from the ameliorated recess.