Surgical instrument

Abstract

A surgical instrument ( 1 ) is provided with a rigid probe ( 2 ), and cuts off the trabecular meshwork by inserting this probe ( 2 ) into the canal of Schlemm. An inner tube portion having a cutter is equipped inside the probe, and the trabecular meshwork sucked in from a hole portion ( 22 ) is cut off by the cutter due to the movement of the inner tube portion. A protection portion ( 21 ) is formed on the tip the probe ( 2 ) and protects the outer wall of the canal of Schlemm when cutting the trabecular meshwork. According to the invention, an ophthalmic surgical instrument for glaucoma patients is provided, the surgical instrument having excellent operability and preventing cutting of parts that should not be cut off without fail.

What is claimed is: 
     
         1 . A surgical instrument used in a cutting operation of a trabecular meshwork, the surgical instrument comprising:
 a grasping portion which a practitioner grasps; and   a probe which is arranged so as to extend like a rod from an end portion of the grasping portion and has a high rigidity,   wherein said probe comprises:   an outflow port which flows out a cleaning liquid toward the trabecular meshwork corresponding to a cut position;   a suction port which is formed in a side surface of said probe, collects the cleaning liquid flowed out of said outflow port as a waste liquid, and sucks the trabecular meshwork into an inner portion of the probe;   a cutting portion which cuts the trabecular meshwork sucked into the suction port; and   a protection portion which is arranged closer to a leading end side of said probe than said suction port and the cutting portion, has such a shape as to be extended to a side surface forming said suction port in the leading end of said probe, and protects an outer wall of a canal of Schlemn corresponding to a non-cut position from the cutting and the suction by being positioned between said cutting portion and the outer wall of the canal of Schlemn during the cutting of the trabecular meshwork by said cutting portion, and   wherein the surgical instrument further comprises:   a first delivery portion which is connected to a power supply portion for cutting a vitreous body in a vitreous body cutting device transmitting power in a vitreous body cutting operation and carrying out the delivery of the cleaning liquid and the collection of the waster liquid, and is provided for feeding the power for cutting from the device to said cutting portion;   a second delivery portion which is connected to a cleaning liquid supply portion for cutting the vitreous body in said vitreous body cutting device, and is provided for feeding the cleaning liquid from the vitreous body cutting device to said outflow port; and   a third delivery portion which is connected to a suction portion for cutting the vitreous body in said vitreous body cutting device, and is provided for feeding the waste liquid sucked by said suction port and the cut trabecular meshwork to the vitreous body cutting device.   
     
     
         2 . The surgical instrument according to  claim 1 , further comprising an inner tube portion arranged so as to have a longitudinal axis in common may be provided in an inner portion of said probe,
 wherein said cutting portion may have a cutting blade which is formed in a side surface of the inner tube portion and cuts the cut position on the basis of a relative rotating motion or a relative translational motion of the inner tube portion in relation to the probe.   
     
     
         3 . A surgical instrument used in a cutting operation of a trabecular meshwork, the surgical instrument comprising a probe,
 wherein the probe comprises:   an outflow port which flows out a cleaning liquid toward the trabecular meshwork corresponding to a cut position;   a suction port which is formed in a side surface of said probe, collects the cleaning liquid flowed out of said outflow port as a waste liquid, and sucks the trabecular meshwork into an inner portion of the probe;   a cutting portion which cuts the trabecular meshwork sucked into the suction port; and   the probe having a high rigidity, and   wherein the probe comprises:   an attaching portion for attaching said surgical instrument;   a protection portion which is arranged closer to a leading end side of said probe than said suction port and the cutting portion, has such a shape as to be extended to a side surface forming said suction port in the leading end of said probe, and protects an outer wall of a canal of Schlemn corresponding to a non-cut position from the cutting and the suction by being positioned between said cutting portion and the outer wall of the canal of Schlemn during the cutting of the trabecular meshwork by said cutting portion; and   an adjusting portion which adjusts a distance between said protection portion and said suction port in a state of being attached to said probe by said attaching portion.