Patent ID: 7998103
Filing Date: 2011-08-16
Classification: A61M

Abstract:
1. A shunt system for implantation of retrograde ventriculo-sinus shunt comprising a shunting catheter and a styforator wherein: the shunting catheter is made of tissue compatible material suitable for implantation in patients, consisting of a ventricular segment, an intermediate segment, and a sinus segment in fluid continuity in the order mentioned wherein: the ventricular segment is made of a high grade semi-rigid modulus silicone rubber resistant to bending and stretching, having a length configured to span the distance between a dural hole made for insertion of the catheter's ventricular end into the ventricle and the site at which the catheter's ventricular end pierces the wall of the ventricle, having a diameter configured to fit into a circular dural hole made for insertion of the catheter's ventricular end into the ventricle, wherein the ventricular end is closed and inlet holes are circumferentially arranged in the wall of a short portion, of its closed ventricular end; the intermediate segment is made of low grade bending modulus silicone rubber which is generally kink resistant, having a length about three times the distance between the circular dural hole made for insertion of the catheter's ventricular end into the ventricle and the site for insertion of the catheter's sinus end into the roof of the dural sinus, wherein the outer and inner diameters of the intermediate segment are more than those of the catheter's ventricular segment by 1.0 mm each, the outer diameter being slightly more than the diameter of the circular dural hole made for insertion of the catheter's ventricular end into the ventricle, the intermediate segment further comprising a 2.0 to 3.0 cm long side tube, having outer and inner diameters equal to those of the catheter's ventricular segment projecting from the intermediate segment's main stem about 3.0 cms distal the proximal end of the intermediate segment, said side tube is angled towards the catheter's sinus end and is provided with a plug to close its open free end, further comprising a marker line at the middle of the pre-side tube portion of the intermediate segment's main stem wherein the tube portion of the intermediate segment has a length configured to join tube portion extends to join in fluid continuity the proximal end of the catheter's sinus segment; the sinus segment is about 5.0 cms long, with outer and inner diameters less than those of the catheter's ventricular segment by 0.5 mm each, the sinus segment's proximal half is made of low grade bending modulus silicone rubber while its distal terminal half is made of a higher grade durometer semi-rigid modulus silicone rubber, wherein the sinus segment ends as a circular terminal sinus opening perpendicular to the longitudinal axis of the terminal semirigid half of the sinus segment; the styforator is made of stainless steel, it is a 4.0 cms long cylindrical rod with a diameter configured to be slightly larger than the outer diameter of the catheter's ventricular segment and slightly less than the outer diameter of the catheter's intermediate segment, one of its ends tapers to form a 2.0 mm long cone with a sharp pointed perforating tip while from the center of its other end projects a stylet configured to have a length three times the length of the catheter's ventricular segment having a diameter slightly less than the inner diameter of the catheter's ventricular segment and wherein the styforator's free end is bullet shaped.