Precursor of a tissue regenerating instrument provided with a swellable rod

A method of producing a tissue regenerating instrument for regenerating a linear tissue from a precursor of the tissue regenerating instrument, wherein the precursor of the tissue regenerating instrument comprising:

• a tube made of the biodegradable material provided with a lumen in a longitudinal direction;
• a rod made of the biodegradable material swellable with a softening solvent, fixed to an inner wall of the tube substantially parallel to the longitudinal direction of the tube;
• and
• a fixing means that fixes the rod to the inner wall of the tube, wherein
• the rod in a non-swelled state has an cross-sectional area perpendicular to the longitudinal direction is smaller than a cross-sectional area of the lumen of the tube, and
• the occupied cross-sectional area perpendicular to the longitudinal direction of the rod in a saturated swelled state with the softening solvent is substantially the same as the cross-sectional area of the lumen of the tube,
• the method of producing a tissue regenerating instrument comprising the steps of:
• (1) immersing the precursor of the tissue regenerating instrument in a softening solvent to swell the precursor of the tissue regenerating instrument;
• (2) releasing the fixing means to make the rod slidable in the inner lumen of the tube;
• (3) excising a portion of the precursor so that the longitudinal length of the precursor is a sum of a length of a tissue to be regenerated and a tissue insertion space forming length (D);
• (4) excising a portion of the rod to make a longitudinal length of the precursor shorter than a longitudinal length of the tube by a tissue insertion space forming length (D);
• and
• (5) arranging the rod in the center of the tube to form a tissue insertion space in a lumen on both ends of the tube.

A tissue regenerating instrument produced from a precursor of the tissue regenerating instrument, wherein the precursor of the tissue regenerating instrument comprising:

• a tube made of a biodegradable material provided with a lumen in a longitudinal direction;
• a rod made of a biodegradable material swellable with a softening solvent, fixed to an inner wall of the tube substantially parallel to the longitudinal direction of the tube;
• and
• a fixing means that fixes the rod to the inner wall of the tube, wherein
• the rod in a non-swelled state has an occupied cross-sectional area perpendicular to the longitudinal direction is smaller than a cross-sectional area of the lumen of the tube, and
• the occupied cross-sectional area perpendicular to the longitudinal direction of the rod in a saturated swelled state with the softening solvent is substantially the same as the cross-sectional area of the lumen of the tube,
• the tissue regenerating instrument being produced by a method of producing a tissue regenerating instrument comprising the steps of:
• (1) immersing the precursor of the tissue regenerating instrument in a softening solvent to swell the precursor of the tissue regenerating instrument;
• (2) releasing the fixing means to make the rod slidable in the inner lumen of the tube;
• (3) excising a portion of the precursor, so that the longitudinal length of the precursor is a sum of a length of a tissue to be regenerated and a tissue insertion space forming length (D);
• (4) excising a portion of the rod to make a longitudinal length of the precursor shorter than a longitudinal length of the tube by a tissue insertion space forming length (D);
• and
• (5) arranging the rod in the center of the tube to form a tissue insertion space in a lumen on both ends of the tube.