TOOTH ROOT EXTRACTOR Russian patent published in 1997 - IPC

FIELD: stomatology. SUBSTANCE: extractor comprises working jaws having two branches 2 and 3 interconnected by first articulation joint 1. First of these branches, i.e. branch 2 includes supporting pad 5, secured to rib, and working jaw 6 in form of terminal curved rod. Second branch 3 has working jaw 7 in form of journal. Terminal curved rod is arranged so as to be able to cooperate with extracting element disposed on jaws 6 and 7. Extracting element comprises clamp 4 made in form of two two-arm levers 9 and 10 symmetrically mounted on first shaft 8. Both levers have elongate conical ends having internal grooves. Latter are provided with circular projections having triangular cross-section, and with shortened ends 8 in form of bosses 11 and 12. Second shaft 17 carried tie-rods 14 and 15, surface of which are adapted to accommodate mating portion of second articulation joint made in form of spherically shaped recess. Second shaft 17 has axial opening adapted to receive curved rode made in form of journal attached to second branch 3. Spherical recess is formed in rotatable bracket 18 mounted on first articulation joint 1 and having П-shaped cross-section and L-shaped longitudinal section. Extractor also has spherical projection 19 adapted to be received into spherical recess and located at end curved in longitudinal section. Projection 19 is capable of cooperating with side surface of tie-rods 14 and 15. Through-going cylindrical openings 21 and 22 are formed in side walls of bracket 18 and in second branch 3, between spherical projection 19 and first articulation joint 11. Both openings 21 and 22 are adapted to receive bobbin-shaped shaft 23 having eccentric composite middle portion carrying cantilevered springy flag-like element 26 arranged at right angle in relation to axial end of shaft 23. Oval slot is formed between first shaft 8 and second shaft 17 in two-arm levers 9 and 10 for purpose of receiving terminal curved rod. Second branch 3 is provided with installation-assisting port 27. Branch 3 is spring-urged in relation to first branch 2 carrying rib 28 projection beyond second branch 3 and adapted to accommodate stomatologist hand's index finger. Internal grooves constitute portions of cylinder. EFFECT: wider range of functional possibilities offered by extractor. 12 dwg