Percussive tool, in particular for surgical use
AssigneeGrünig & Elminger AG
InventorDaniel Grünig
Life of this patent
Estimating the term…
Abstract
The invention relates to a percussive tool having an oscillatory drive (3), the force of which is transmitted to a tool bit holder (25) by way of a drive member (17). Extending through the percussive tool is a longitudinal opening that allows a rod-shaped object, such as, for example, a guide wire, to be guided through the percussive tool. The tool bit holder (25) has a seat (34), which can receive the tool bit in different orientations. Moreover, the tool bit holder (25) is made of a combination of light metal and steel, which allows a reduction in acceleration forces and noise generation. A saddle-shaped coupling (24) is provided between the tool bit holder (25) and the drive member (17), which guarantees a tight fit.
Claims17
A percussive tool, in particular for surgical use, comprising a drive part (3) and a tool holder (25), which is linked to the drive part (3) and is arranged on a front side of the drive part (3), the drive part (3) being designed so as to exert oscillatory forces, acting in an axial direction (A), on the tool bit holder (25), characterized in that the percussive tool has a longitudinal opening provided by a through longitudinal hole extending in the axial direction (A) through the tool bit holder (25) and the drive part (3) from the front side of the percussive tool to a back side of the percussive tool for passage of a rod-shaped component, wherein the drive part (3) has a piston (4) that is driven to undergo oscillatory movements, the longitudinal opening extending through the piston (4), the tool bit holder (25) is linked to the drive part (3) by way of a drive member (17), the longitudinal opening extending through the drive member (17), wherein the drive member (17) has a enlargement (16), which is arranged in a cavity (15) in the interior of the piston (4), the longitudinal opening passing through the cavity (15) and an opening (104), behind the cavity, in the piston (4) and, in particular, the cavity (15) being sealed from a cylinder chamber (6), in which the piston (4) is situated, by means of a seal (20).
The percussive tool, in particular for surgical use, comprising
- a drive part (3),
- a drive member (17) linked to the drive part (3), and
- a tool bit holder (25) arranged on a front side of the drive part (3) and linked to the drive member (17), the tool bit holder comprising a central body (30), a frontal terminal part (31) and rear terminal part (32),
- wherein the drive part (3) is designed so as to exert oscillatory forces, acting in an axial direction (A), on the tool bit holder (25) by way of the drive member (17),
- characterized in that the drive member (17) is linked to the tool bit holder (25) by way of a coupling (24), the coupling (24) having an outwardly tapering first part (80) and an outwardly expanding second part (81) that sits on the first part, the second part being seated on the first part under axial tension and being spread apart, and
- that a tension member (85) is arranged between the tool bit holder (25) and the drive member (17) for linking the parts and for producing the axial tension and wherein the tension member (85) in is the form of a coupling screw (85) extending through the coupling (24) and wherein a longitudinal opening (102) extends through the coupling screw (85 and wherein the coupling screw (85) is retained by at least one retaining element in an interlocking manner against movement and wherein the retaining element is a retaining pin (87), seated in a pin hole (88) in the rear terminal part (32) and is held by at least one pin lock (90) and the pin lock (90) has a locking element arranged in the rear terminal part (32) and held against a spring force it being possible to move the lock body out of the pin hole (88) against the spring force.
The percussive tool, in particular for surgical use, comprising a drive part (3) and a tool holder (25), which is linked to the drive part (3) and is arranged on a front side of the drive part (3), the drive part (3) being designed so as to exert oscillatory forces, acting in an axial direction (A), on the tool bit holder (25), wherein the tool holder (25) has an orifice opening and a seat (3A) arranged on the orifice opening (36) for receiving a tool bit in a rotationally rigid manner,
- further characterized in that the seat 34 has a receiving face (40) perpendicular to the axial direction (A), from which at least four raised parts (42) project symmetrically around the orifice opening (36) frontally over the receiving face (40), between each of which space for receiving the shoulders of the tool bit remains, and the four raised parts (42) are formed such that they form symmetrical depressions (43) forming two grooves, which are mutually perpendicular and perpendicular to the axial direction A and are formed for receiving a shoulder (39) of a tool bit (25).
The percussive tool, in particular for surgical use, comprising a drive part (3) and a tool holder (25), which is linked to the drive part (3) and is arranged on a front side of the drive part (3), the drive part (3) being designed so as to exert oscillatory forces, acting in an axial direction (A), on the tool bit holder (25),
- further characterized in that the tool bit holder (25) has a central body (30) made of light metal, a front terminal part (31) made of steel, and a rear terminal part (32) made of steel, and
- wherein, in the tool bit holder (25), is arranged in the central body (30), a holding mechanism (50) for holding in place the tool bit engaged in the central body (30) through an orifice opening (36) and wherein a steel jacket (63) is arranged between the holding mechanism (50) and the central body (50), and wherein the holding mechanism (50) has a holding element (52), which can move transverse to the longitudinal axis against a spring force.
Dependencies are inferred from the claim text.