Sizing unit for cutting stoma wafers
BACKGROUND AND SUMMARY OF THE INVENTION 
     A typical stoma appliance comprises a face-plate or wafer adhesively applied to the user&#39;s peristomal skin and having an opening or hole at which the stoma is exposed. The wafer includes a ring or flange to which a pouch is detachably connected for receiving ileac waste. Most wafers are provided with a starter hole too small for immediate use but which must be enlarged according to the diameter of the stoma. Enlargement of the hole is usually accomplished by the use of scissors with curved blades. Because of the relatively wide variations in stoma diameters it is not feasible to manufacture and sell wafers according to different stoma diameters. Thus, the &#34;popular&#34; system is for the user to purchase wafers and cut holes according to his particular situation. 
     A major problem that results from scissor-cutting of the stoma hole is that the hole is usually not only inaccurately sized as to diameter but it frequently has ragged edges which permit leakage between the back face of the wafer and the peristomal skin and ileac waste migrates outwardly from the stoma and causes disintegration of the seal between the wafer and the skin. This of course requires early replacement of the wafer and increases the user&#39;s costs and the need for scissor-cutting of a hole in the replacement wafer. 
     According to the present invention, a low-cost sizing unit is provided in the form of a kit or fixture for sale to ostomates to be used by them for cutting accurate circular holes in stoma wafers by means of a base having a flat top on which the wafer is placed flatwise to be cut at its center by an accurately gaged circular cutter which centers on the center of the wafer and cuts a hole according to the dimension of the user&#39;s stoma. It is a feature of the invention that the base includes locator means for accurately positioning the wafer relative to a gage adjustably located with respect to the wafer center. The adjustability of the gage accommodates cutters of different diameters. 
     The unit components are formed of materials having the characteristics of long-life, low cost and easy maintenance. The cutter is preferably made of two parts, a manually engageable body and a separable cutting element enabling interchangeability of several cutters while retaining the main body, thus further lowering the purchase price of the unit. 
    
    
     Further features and advantages of the invention will appear as a preferred embodiment of the invention is disclosed in the ensuing description and accompanying drawings. 
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a prespective of the complete unit, showing a stoma wafer and a cutter in operating position. 
     FIG. 2 is a similar view but with the cutter removed. 
     FIG. 3 is a plan view of the unit, also without the cutter. 
     FIG. 4 is a side view of the unit, with the cutter in place. 
     FIG. 5 is a perspective of the assembled cutter. 
     FIG. 6 is an elevation of the cutter with portions broken away to show the interior structure. 
     FIG. 7 is a section on the line 7--7 of FIG. 3. 
     FIG. 8 is a face view of a stoma wafer having a starter hole. 
     FIG. 9 shows the stoma wafer with a larger stoma hole. 
    
    
     DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 
     Reference will be had first to FIG. 8 for a brief description of a stoma wafer 10, typically square with rounded corners and having a starter or pilot hole 12 centered within a circular ring or flange 14 to which the appliance pouch (not shown) is attachable. Wafers or plates are commonly furnished in several sizes; e.g., four, five and six-inch squares of relatively thin, film-like material of suitable plastic or like composition. To prepare the wafer for use, whether with or without the starter hole, the user first accurately measures his stoma as to diameter and, then, with scissors, cuts a circular (or near circular) hole centered in the face of the wafer and having a diameter somewhat larger in diameter than the diameter of his stoma. Current recommendations are that the hole should be about one-eighth to one-quarter of an inch larger than the stoma diameter. The need for accuracy in cutting the hole is seen in the requirement that the wafer-to-skin seal be as near perfect as possible and further that the configuration be such as not to irritate the stoma or the surrounding skin. 
     The sizing unit includes a base 16, here made of hardwood such as oak, maple, etc., and preferably having a square shape wherein the sides or edges of the square provide marginal portions 18 delineating a flat top surface area 20 for receiving the stoma wafer 10 flatwise thereon. Along two of the sides or edges 18 that meet at a corner 22 the base has rigid thereon locator means in the form of upstanding ribs or strips 24 that are abutted by two edges of the wafer for accurately positioning the wafer on the base top. The base area exceeds that of a four-inch wafer so as to accommodate larger-area wafers. In this respect, it should be noted that the locator strips will accommodate circular or part-circular wafers because of the geometrical relationship between two sides a right angle (as at the corner of the strips 24) and an arc about a radius and tangent to those sides. The center of the wafer will lie on a line that bisects the angle between the locator strips, which in this case is a diagonal of the square base and wafer. 
     The base carries, at the corner where the locator strips meet, a support 26 which is configured to provide a socket 28. The support is attached to the base as by screws 30 and the support is accurately positioned on the base so that the center line of the socket is vertically coplanar with the diagonal referred to above. In the present case, the socket is square in cross section (FIG. 7) for receiving and supporting gage means 32 of Y-shaped configuration and having a leg 34 an inner portion made up of and a pair of arms 36 integral with the leg and disposed at right angles to each other. The leg of course lies along the afore-said diagonal and its end remote from the arms 36 is formed as a square shank 38 snugly but slidably received in the support socket 28 for selective adjustment along the diagonal. A set screw 40 cooperates between the support and shank for fixing the selected position of the gage. Since the socket and shank are square, the gage is not rotatable about its length-wise axis and thus the gage arms will be horizontally coplanar with the base top and stoma face. 
     The unit is furnished by the supplier with the gage means set at a situs according to the directions of the ultimate user in which situs the arms are centered on the centerline of the wafer, or coaxial with the starter hole 12, which, being too small (one-half inch or so) for use as a stoma hole, must be enlarged This function is achieved here by a cutter element 42, here made up of an upper part or body 44 and a lower part 46, both of which are preferably cylindrical. In this case, the lower part is gaged by the gage means by being tangently received between the gage means arms 36 which thus center the cutter on the axis or vertical centerline of the starter or pilot hole. In the case of a wafer without the starter hole, the cutter will center on the exact center of the wafer area. In either instance, the cutter will cut into the wafer to form a circular stoma hole or opening 48 (FIG. 9) of a size determined by a lower cutting edge 50 on the cutter lower part 46, the cutting edge diameter and the setting of the gage means having been selected according to the user&#39;s prior measurement of his stoma. The top part of the cutter is provided with grooves or equivalent gripping portions 52 to improve the hand-grip of the user for rotating the cutter. 
     The cutter parts are separably interconnected, as by a socket 54 in the body and a lug or projection 56 on the lower part, these being preferably square in cross-section. A set screw 58 is used as releasable means to connect and disconnect the parts. 
     The use and operation of the unit will have been clear from the foregoing. It should be observed that shapes and dimensions have been used in somewhat specific senses in the interests of clarity and convenience and may be varied within wide limits without departing from the spirit and scope of the invention.