System with a screwdriver and a bone screw
AssigneeRichard Martin Medizintechnik GmbH
InventorWinfried Kreidler
Life of this patent
Estimating the term…
Abstract
A system is provided with a screwdriver and a bone screw (30), wherein the screwdriver has a tool (4), which is provided with at least two radially and axially extending tool blades (5, 6, 7, 8), which can be caused to engage groove-like blade slots (36, 38) of the bone screw (30) in a positive-locking manner. To improve the handling of a bone screw (30) even in case of the smallest possible dimensions, provisions are made according to the present invention for the tool blades (5, 6, 7, 8) to form at least one elastic clamping section (20, 21, 22, 23), with which the tool (4) can be caused to clampingly engage the bone screw (30) in the area of the blade slots (36, 38).
Claims20
A system comprising:
- a screwdriver having a tool shank and a tool element with at least two axially and radially extending tool blades, each tool blade having at least one elastic clamping section, said elastic clamping section being moveable from a first position to a second position, said tool element having a central shank core, said tool blades being formed by uniform cutouts of a rotationally symmetrical blade shank, said cutouts having a triangular cross section, said tool blades being connected with one another in one piece via said central shank core, one tool blade being connected with another tool blade in one piece via said central shank core, each tool blade having a front surface extending along a cross section of said tool shank in a direction substantially perpendicular to a longitudinal axis of said tool shank, said tool blades having separating slots, each tool blade being elastic in a circumferential direction via said separating slots;
- and
- a bone screw with groove-like blade slots, each tool blade engaging each groove-like slot such that said bone screw moves said clamping section from said first position to said second position when said bone screw is connected to said tool element, whereby said clamping section clampingly engages said bone screw in said second position.
A system comprising:
- a screwdriver having a tool shank and a tool element with a first axially and radially extending tool blade and a second axially and radially extending tool blade, said first tool blade having a first retaining element, said second tool blade having a second retaining element, said tool element having a central core shank, said first axially and radially extending tool blade and said second axially and radially extending tool blade being integrally connected to said central core shank, each tool blade having a front surface extending along a cross sectional length of said tool shank in a direction substantially perpendicular to a longitudinal axis of said tool shank;
- and
- a bone screw having an outer surface defining a first groove-like blade slot and a second groove-like blade slot, said bone screw having an inner surface defining a retaining element insertion gap, said first tool blade engaging said first blade slot, said second tool blade engaging said second blade slot, said first retaining element and said second retaining element being flexible to generate a snap in retaining function as said first retaining element and said second retaining element is moved into said retaining element insertion gap, whereby said bone screw is connected to said screwdriver.
Dependencies are inferred from the claim text.