Patent ID: 11857238
Assignee: INNOPROD MEDICAL
Field: Medical technology (Instruments)
Classification: CPC A  B | IPC A  B

Claim 0:
1. A screwdriver comprising a ratchet system configured to connect a handle to a rod, the ratchet system comprising:
at least one handle comprising a cylindrical distal end extending along a first axis of revolution and further comprising a connection surface extending perpendicular to the first axis of revolution of the cylindrical distal end;
at least one rod comprising a male distal end, a cylindrical proximal end extending along a second axis of revolution and a contact surface, said cylindrical proximal end comprising a cavity presenting an internal wall; and
cooperation means including:
at least two lugs positioned on the distal end of the at least one handle; and
at least two grooves positioned on the internal wall of the cavity and extending from the contact surface towards the proximal end of the at least one rod, each of the at least two grooves comprising a helical portion, one end of which is a flat perpendicular wall to said inner wall;

the at least two lugs each cooperating in only a predetermined rotation direction with one of the at least two grooves so as to be in contact with said flat perpendicular wall, said contact allowing driving, in the predetermined rotation direction, of the at least one rod by the at least one handle;
wherein the cylindrical proximal end of the at least one rod can cooperate with the distal end of the at least one handle by means of the cooperation means until abutment contact between the connection surface with the contact surface is established in order to align the first and second axis of revolution and drive the at least one rod in the same rotation direction; and
wherein the at least one handle is configured in a way that the at least two lugs separate from said flat perpendicular wall when the at least one handle is rotated in a rotation direction opposite the predetermined rotation direction so that the at least one rod is prevented from driving in the opposite rotation direction, and the at least one handle remains trapped in the cavity, in order to allow driving of the at least one rod in the predetermined rotational direction when the at least one handle is rotated in the predetermined rotation direction.