Medical device

摘要

A medical device is configured to position a bag member filled with a therapeutic substance in a prescribed region of the brain. The use of this medical device involves, with a sheath inserted in the brain region, filling a therapeutic substance into a bag member through an infusion tube, followed by retracting the sheath relative to the infusion tube until the bag member protrudes forward beyond the distal end of the sheath. After this, the bag member is put indwelling in the brain region by moving an operating member relative to the infusion tube to detach the bag member from the distal end of the infusion tube.

主权项

1. A medical device comprising:
a sheath possessing an open distal end; an infusion tube positioned inside the sheath and movable in an advancing and retracting manner relative to the sheath, the infusion tube possessing an interior which opens at a distal end of the infusion tube; a porous bag member including an opening which opens into an interior of the bag member, the porous bag member being detachably positioned at the distal end of the infusion tube, with the interior of the porous bag member communicating with the interior of the infusion tube, the bag member being positioned in the sheath; closing means disposed at the opening of the bag member for closing the opening of the bag member by elastic force when the bag member is detached from the distal end of the infusion tube; an operating member positioned in the sheath and movable in an advancing and retracting manner relative to the infusion tube to detach the bag member from the distal end of the infusion tube by moving the closing means forward relative to the infusion tube; the bag member being configured to be indwelled in a brain region by a process comprising:
inserting the sheath into the brain region, filling the bag member with a therapeutic substance by way of the infusion tube, and retracting the sheath relative to the infusion tube until the bag member protrudes forward from the distal end of the sheath, with the inserting, filling and retracting being performed in any order; andthereafter moving the operating member relative to the infusion tube to detach the bag member from the distal end of the infusion tube.