Patent GB-388029-A (GB)
Title: Improvements in and relating to embryotomes
IPC: A61D1/10
Filed: 1931-05-12
Abstract: 388,029. Embryotomes ; dilating- appliances. REETZ, G., Kreis Ebstorf, Uelzen, Hanover, Germany. May 12, 1931, No. 14014. Addition to 368,728. [Class 81 (ii).] The embryotome described in the parent Specification, comprising a wire saw reciprocated by hand and passing over movable guides such as pulleys on the body of the instrument, is improved and modified to produce the following constructions :-The pulleys 4, Fig. 1, are journalled in a plate 2 and a bridge-piece 2a connected thereto, the bearings being preferably such as to allow a slight rocking movement of the pulleys out of their normal plane. An upstanding pillar 1 on the part 2a has a bearing in which a guide-rod 5 is adjustably secured by a set-screw G. Stayrods 9, connected to the handle of the instrument, are secured in keyhole slots 8 in the plate 2. A spike-ended cranked arm a, having a disc b and secured to the rod 5 facilitates the introduction and positioning of the instrument. In Fig. 7, the pulleys 4 are mounted in a crosshead 2 having a straight or oblique slot c in its upper side to facilitate introduction of the saw. The crosshead is pivotally mounted on the central guide-rod s or on a curved arm f pivoted on the guide-rod. Vaginal-dilating arms h, g are rotatably mounted on the rod s ; the arms may be replaced by a rectangular frame, similarly mounted and adapted to be inserted vertically and then turned to horizontal position. An arm such as a, Fig. 1, or a positioning hook s<1>, may be provided on the rod s. As shown in Fig. 11 the pulleys are pivotally mounted, by rings m, upon rods l rotatably secured on either side of the rod s in bracket arms k. One or both rods l carry securing hooks n at their front ends and may carry dilating arms r, r<1>, the arms r<1> being offset to clear the saw. The forward portion is provided with a pivoted ball o mounted in a hood p. The rod s is connected to an arcuate handle having slots in which the rods l are rotatably secured by set screws. As shown in Fig. 15 tubular shields t for the saw, mounted on a central rod s carrying a positioning-hook n, house, in cut-away portions thereof, pivoted arms m carrying the pulleys 4. In Fig. 17 in which the saw is not passed around, but merely held against the foetus, the tubes t are secured to a cover-plate p, carrying a rotatable ball at its forward end, and the pulleys 4 are carried on rods rotatably mounted in the tubes by means of thrust-bearings u. A central guiderod is dispensed with but a rod 5 serves to manipulate a central pivoted spur n. In a modification the pivoted ball is replaced by a hemispherical head to the cover-plate p and side spurs, also manipulated by the rod 5 are provided. In order to assist the positioning of the saw around the desired part of the foetus an appliance, shown in Fig. 22, is provided comprising a rod 46 carrying a frame of wire bent to form side fingers 48, 50, and a central finger 52, offset from the plane of the frame. The saw, after being passed around the fcetus, may be held between the central and side fingers and pushed to the position desired. A saw-handle, which permits ready attachment and detachment of the saw, and also facilitates the passing of the saw around the foetus, as shown in Fig. 24, comprises a body portion 35 having a conical socket 40 engaged by a conical hub 39, divided longitudinally into two or more sectors between'which the end of saw is held. The nut is tightened against its socket by a threaded bolt 36 rotatable by a handle 44. Longitudinal movement of the bolt is prevented by a collar 37 and a plug 38, and rotational movement of the nut by a rib 41 engaging a groove 42.