Patent ID: 8251999

Claim:
A system to penetrate into tissue, comprising a shaft, said shaft having a first end; a cutting bit, said cutting bit at said shaft first end, said cutting bit being ductile, and said cutting bit having width; a guide tube, said guide tube sized to surround said shaft, said guide tube having a sharp non-coring tip at its end, said guide tube having an interior passage, said guide tube having length; a drive unit, said drive unit capable of operable connection to said shaft, said drive unit capable of least partially rotating said shaft; a cortex adapter, said cortex adapter having a first end, said cortex adapter sized pass through said interior passage of said guide tube, said cortex adapter having length greater than said length of said guide tube, said cortex adapter having an interior passage, said cortex adapter capable of positioning within said guide tube and into said tissue at said first end of said cortex adapter, said cortex adapter having an outer diameter at said first end of said cortex adapter, said outer diameter of said cortex adapter at said first end of said cortex adapter equivalent to but not greater than said width of said cutting bit; and a stylet, said stylet capable of positioning within said interior passage of said cortex adapter, and said stylet having length sufficient to pass through said cortex adapter.