Resorbable fixation device with controlled stiffness for treating bodily material in vivo and introducer therefor

In a resorbable fixation device for treating torn bodily material in vivo having a tip, a head, and a cylindrically shaped shaft portion lying between said tip and said head, said shaft portion having at least one retention element protruding radially therefrom to facilitate insertion of said shaft portion longitudinally into said bodily material in a forward axial direction extending from said tip to said head and to restrict movement of said shaft portion through said bodily material in a backward axial direction opposite to said forward direction, the improvement comprising that

• said shaft portion has internal walls defining a longitudinal hollow portion with at least one radial opening extending transverse thereto and rendering said shaft portion radially elastic;
• said shaft portion being provided with at least one stiffening element arranged along the inner side of said walls and protruding into said hollow portion;
• and
• said radial opening being in the form of a longitudinal slit dividing said shaft into two lateral segments connected at least at said tip.