Surgical instrument and method for improving a crestal sinus lift

A surgical instrument for detaching a sinus membrane from a jawbone during a sinus lift, comprising:

• a substantially cylindrical sleeve having a dull distal tip, said sleeve sealingly insertable into a predrilled bore of the jawbone, said sleeve having a not more than one lumen, the not more than one lumen extending entirely along the sleeve from a proximal end of the sleeve to the distal tip of the sleeve, said not more than one lumen containing a fluid under pressure;
• and
• a vibration unit operatively connected to the sleeve to cause vibrations of the fluid in the lumen and transmission of the vibrations to an area outside the lumen to promote in the area outside of the lumen an elevation of the sinus membrane from the jawbone.