DEVICE FOR FORMING AN OPENING ADAPTED TO RECEIVE A CRANIAL PLUG

摘要

Device adapted to perform appropriate forming of openings (3) made in the skull (2) during craniotomy with an opening (4) of enlarged diameter that may thereafter be filled with a standardised cranial plug, the device comprising a cylindrical body member (6) with a rear end extending into a shaft (8) coupled in a rotary power supply source and a frontal end provided with a cutting head (8a) with cutting teeth of triangular section and a guide head (10) comprising a first cylindrical portion (10a) having a diameter equivalent to the corresponding diameter of opening (3) that extends forwardly of the cutting head (8a) and is inserted into opening (3) stabilizing the device and allowing subsequent drilling of opening (3) with the cutting head (8a) to form the abovementioned opening (4) of enlarged diameter, the drilling operation being terminated with the contact of a circumferential ring (7) provided at the frontal end of the cylindrical body member (6) onto the skull (2).

主权项

1. Device adapted to perform appropriate forming of openings (3) made in the skull (2) to facilitate cutting out a skull flap during brain surgery with a scope of subsequently filling such openings with standardised cranial plugs, said device characterised in that it comprises:
a cylindrical body member (6) with a rear end extending into a shaft (8) having the appropriate configuration for being coupled in a rotary power supply source and a frontal end provided with a cutting head (8a) comprising a perimetrical arrangement of cutting teeth of triangular section, said frontal end of the cylindrical body member (6) comprising a circumferential ring (7) prior to the cutting head (8a), said circumferential ring (7) having a diameter larger than the diameter of the cutting head (8a) and forming a circumferential flat basement (7a), and a guide head (10) comprising a first cylindrical portion (10a) that has a diameter, smaller than the external diameter of the cutting head (8a) and larger than the internal diameter thereof, equivalent to the corresponding diameter of an opening (3) made in the skull (2) so as to firmly fit onto the walls of said opening (3) when inserted therein, said first cylindrical portion (10a) extending forwardly of said cutting head (8a) into a concentrically oriented second cylindrical portion (13) having a diameter smaller than the diameter of the first cylindrical portion (10a) and equivalent to the interior diameter of the cutting head (8a) so as to terminate onto a basement flange (17a) provided at the frontal end of said cylindrical body member (6), said second cylindrical portion (13) extending into a shaft (14) having a yet smaller diameter than said first cylindrical portion (10a) and said second cylindrical portion (13), said shaft (14) entering through an opening (17) in the interior of the cylindrical body member (6) of the device, said guide head (10) being fixedly mounted onto said cylindrical body member (6) with said first cylindrical portion (10a) thereof extending forwardly said cutting head (8a), whereby a previously cut opening (3) of the skull (2) is appropriately formed for the reception of a cranial plug through introduction of said first cylindrical portion (10a) of the guide head (10) at the inlet of said opening (3) and firm fitting thereof within the side walls of opening (3) and subsequent initiating rotation of said cutting head (8a) drilling into the opening (3) and cutting a portion of the side walls thereof thereby creating an opening portion (4) appropriately formed for the reception of said cranial plug, said opening portion (4) having a diameter larger than the bore of opening (3) and extending at a depth corresponding to the length of the cutting head (8a) protruding forwardly said circumferential ring (7), wherein operation of said cutting head (8a) is terminated when said flat basement (7a) of said circumferential ring (7) comes in contact with the exterior surface of the skull (2).