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1. (WO1992009817) BONE SCREW WITH IMPROVED THREADS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/009817 International Application No.: PCT/US1991/008813
Publication Date: 11.06.1992 International Filing Date: 26.11.1991
Chapter 2 Demand Filed: 15.06.1992
IPC:
A61B 17/86 (2006.01) ,F16B 25/00 (2006.01) ,F16B 33/02 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
17
Surgical instruments, devices or methods, e.g. tourniquets
56
Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
58
for osteosynthesis, e.g. bone plates, screws or the like
68
Internal fixation devices
84
Fasteners therefor
86
Pins or screws
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
B
DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
25
Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
B
DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
33
Features common to bolt and nut
02
Shape of thread; Special thread-forms
Applicants:
STUART SURGICAL [US/US]; One Stuart Plaza Greensburg, PA 15601, US
Inventors:
LASNER, Jeffrey; US
Agent:
NELSON, Jeffry, H.; Nixon & Vanderhye 8th Floor 1100 North Glebe Road Arlington, VA 22201-4714, US
Priority Data:
618,50027.11.1990US
Title (EN) BONE SCREW WITH IMPROVED THREADS
(FR) VIS INTRAOSSEUSE A FILETS AMELIORES
Abstract:
(EN) A bone screw (10) having a helical thread that gradually increases in thickness from the tip (14) to the head (11) of the screw. The thin thread at the tip of the screw can be inserted into a bone with minimal tearing or cracking of the bone. The thicker treads ascending from the tip to the head of the screw displaces bone against the superior (top) thread surfaces (17). This displacement of bone increases the screw's resistance to being pulled-out of the bone. The thicker core just below the screw head increases the screw's ability to withstand compressive and distractive loads. The core (12) is thickest just below the head because it is at that point on the screw that the fulcrum loads are greatest.
(FR) Vis intraosseuse (10) comportant un filetage hélicoïdal dont l'épaisseur augmente graduellement de la pointe (14) à la tête (11) de ladite vis. Le filet mince situé au bout de la vis peut être inséré dans un os en provoquant un déchirement ou une fissuration minimal(e) de l'os. Les filets dont l'épaisseur augmente de la pointe à la tête de la vis déplacent de la substance osseuse vers les surfaces supérieures (17) des filets. Ce déplacement de substance osseuse augmente la résistance de la vis vis-à-vis des forces susceptibles de l'arracher de l'os. La partie centrale plus épaisse juste au-dessous de la tête de vis augmente la capacité de la vis à résister à des forces de compression et de traction. La partie centrale (12) a son épaisseur maximum juste sous la tête parce que c'est à ce point de la vis que les charges d'appui sont les plus importantes.
Designated States: AU, CA, JP, KR
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0558653JPH06504456CA2097052KR1019937003545AU1991091043AU1995021704