Mechanism for holding elongate medical apparatus
A cochlear implant insertion-assisting device includes a tubular member configured to hold a cochlear implant. The tubular member includes a cut extending in a longitudinal direction. The cochlear implant insertion-assisting device can selectively switch between a first state in which the cochlear implant is held and a second state in which the cochlear implant can be released.
1. A holding mechanism for a medical instrument having an elongated shape, the holding mechanism comprising:
a main body that is hollow and has a cylindrical shape;
a holding portion connected in parallel to the main body and including an opening along an entire length of the holding portion in a longitudinal direction; and
a tubular member inserted in the holding portion and configured to hold the medical instrument provided in the holding portion, wherein
the tubular member includes a cut extending an entire length of the tubular member in the longitudinal direction,
the tubular member has a length longer than that of the holding portion, and
the holding mechanism can selectively switch between a first state in which the medical instrument is held and a second state in which the medical instrument can be released through the cut in the tubular member.
2. The holding mechanism according to claim 1 , wherein the tubular member is a first tubular member,
wherein the holding mechanism further comprises a second tubular member including a cut extending an entire length of the second tubular member in the longitudinal direction, the second tubular member being disposed inside the first tubular member,
a width of the cut of the first tubular member and a width of the cut of the second tubular member are greater than a diameter of the medical instrument, and
in the second state, a position of the cut of the first tubular member and a position of the cut of the second tubular member are aligned by rotating the second tubular member, and the medical instrument held inside the second tubular member is allowed to be released.
3. The holding mechanism according to claim 1 , wherein,
in the second state, the tubular member allows the medical instrument held inside to be released by expanding a width of the cut to be greater than an outer diameter of the medical instrument.
4. The holding mechanism according to claim 3 , wherein a shape-memory alloy wire is wound around the tubular member, and
in the second state, the width of the cut of the tubular member expands to be greater than the outer diameter of the medical instrument by shrinking of the shape-memory alloy wire due to electric heating, and the medical instrument is allowed to be released.
5. The holding mechanism according to claim 4 , wherein a polymer tube covers the shape-memory alloy wire.
6. The holding mechanism according to 1 , wherein the medical instrument is a cochlear implant or an artificial ear ossicle.
7. The holding mechanism according to claim 1 , wherein the holding mechanism is an attachment device configured to be attached to an endoscope.