Surgical apparatus for a vitreous
First Claim
1. A surgical apparatus for removing a vitreous in an eyeball, comprising:
- a cylinder;
a piston disposed in the cylinder so as to be capable of moving;
a moving device for reciprocating the piston in the cylinder; and
a vitreous cutter comprising a first gas chamber which connects with a second gas chamber in the cylinder via a tube, an outer tubular blade having a hole, an inner tubular blade, a moving body which is capable of moving in a longitudinal axial direction of the outer tubular blade with holding the inner tubular blade, and an energisation device which causes the moving body to perform a backward movement toward the opposite side of the hole relative to the outer tubular blade;
wherein the inner tubular blade and the moving body being caused to perform a forward movement toward the hole relative to the outer tubular blade by a pressure rise in the first gas chamber, the pressure rise being caused by the forward movement of the piston, and to perform the backward movement relative to the outer tubular blade, which is accelerated by a negative pressure by a pressure fall in the second gas chamber connected to the first gas chamber via the tube, the pressure fall being caused by the backward movement of the piston.
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Accused Products
Abstract
A surgical apparatus for removing a vitreous in an eyeball, comprises a cylinder, a piston disposed in the cylinder so as to be capable of moving, a moving device for reciprocating the piston in the cylinder, and a vitreous cutter. The vitreous cutter comprises a first gas chamber which connects with a second has chamber in the cylinder via a tube, an outer tubular blade having a hole, an inner tubular blade, a moving body which is capable of moving in a longitudinal axial direction of the outer tubular blade with holding the inner tubular blade, and an energisation device which causes the moving body to perform a backward movement toward the opposite side of the hole relative to the outer tubular blade. Where the inner tubular blade and the moving body are caused to perform a forward movement toward the hole relative to the outer tubular blade by a pressure rise in the first gas chamber, the pressure rise being caused by the forward movement of the piston, and to perform the backward movement relative to the outer tubular blade, which is accelerated by a negative pressure by a pressure fall in a second gas chamber connected to the first gas chamber via the tube, the pressure fall being caused by the backward movement of the piston.
44 Citations
8 Claims
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1. A surgical apparatus for removing a vitreous in an eyeball, comprising:
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a cylinder;
a piston disposed in the cylinder so as to be capable of moving;
a moving device for reciprocating the piston in the cylinder; and
a vitreous cutter comprising a first gas chamber which connects with a second gas chamber in the cylinder via a tube, an outer tubular blade having a hole, an inner tubular blade, a moving body which is capable of moving in a longitudinal axial direction of the outer tubular blade with holding the inner tubular blade, and an energisation device which causes the moving body to perform a backward movement toward the opposite side of the hole relative to the outer tubular blade;
wherein the inner tubular blade and the moving body being caused to perform a forward movement toward the hole relative to the outer tubular blade by a pressure rise in the first gas chamber, the pressure rise being caused by the forward movement of the piston, and to perform the backward movement relative to the outer tubular blade, which is accelerated by a negative pressure by a pressure fall in the second gas chamber connected to the first gas chamber via the tube, the pressure fall being caused by the backward movement of the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
a supplying device for supplying compressed-gas which is utilized for causing the piston to perform the forward movement.
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3. The surgical apparatus according to claim 2, wherein the supplying device comprising:
an exhaust hole which is utilized for exhausting gas from the cylinder.
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4. The surgical apparatus according to claim 1, wherein the piston comprising:
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a first piston; and
a second piston being incorporated with the first piston in a body; and
the cylinder comprising;
a first cylinder in which the first piston moves; and
a second cylinder being incorporated with the first cylinder, in which the second piston moves.
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5. The surgical apparatus according to claim 4, wherein the moving device comprising:
a supplying device which is utilized for supplying compressed-gas mutually to a third gas chamber and a fourth gas chamber in the second cylinder.
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6. The surgical apparatus according to claim 5, wherein the supplying device comprising:
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a first exhaust hole which connects with the third gas chamber; and
a second exhaust hole which connects with the fourth gas chamber.
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7. The surgical apparatus according to claim 5, further comprising:
a draft hole which allows the second gas chamber to be connected to the third gas chamber.
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8. The surgical apparatus according to claim 1, further comprising:
devices for controlling a gas pressure by allowing the second gas chamber to be connected to outside air when the piston is at a given position in the cylinder, and by causing the second gas chamber not to be connected to the outside air when the piston is at a position except the given position.
Specification