Abstract: A reamer system is provided which includes a cannulated reamer holder, and a corresponding cannulated reamer, which, when assembled and operated over a drill pin secured in a manner axially aligned with the stem of the femoral joint, enables the accurate and controlled reshaping of the femoral joint. The reamer is made up of a cutting form and a central guide, in which the guide is supported at the center of the cutting form by a bar structure. The bar structure includes portions which connect to and extend radially between the central guide and a peripheral edge of the cutting form.

Abstract: An acetabular reaming system is disclosed of the type having a driver and a tool held together by a quick-release coupling mechanism. The tool (10) has a hollow body (12) defining a domed shape with a rotational axis (14), an apex (16) aligned with the axis (14) and a hemispherical wall (18) extending from the apex (16) to an equatorial rim (20) spaced 90 degrees from the axis (14). The rim (20) has an edge (22) visible to the user that indicates the position of the tool (10) relative to the bone. A first plurality of cutting sites (24) is arrayed along the body (12) and a second plurality of cutting sites (28) is arrayed circumferentially along the edge (22). Preferably, the first plurality of cutting sites (24) present raised first teeth (30, 130, 230, 330) having a profile selected from continuous squared (30), continuous rounded (130), discontinuous squared (230) and tongued (330) profiles.

Abstract: A surgical tool holder 12 and tool system 10 is provided. The surgical tool holder (12) is adapted to connect to a tool support (14) having an interface receiver (36). The tool support provides a mount for a surgical tool head. The tool holder (12) includes a center rod (20), a tool interface (28) and a quick connect mechanism (50). The center rod (20) has a first shank end (24) and a second tool end (26). The tool interface (28) is disposed on the tool end (26) of the center rod (20). The tool interface (28) has at least one transversely extending portion (44, 44a), extending radially outward, beyond the diameter of the center rod (20) at the tool end (26). The interface (28) is adapted to engage with the interface receiver (36). The quick connect mechanism (50) is disposed on the center rod (20) to move in a rotationally-constrained manner thereon proximate the tool interface (28).

Abstract: A surgical tool holder aids a surgeon in controlling the use of a tool during, for example, preparation of a femoral cavity for reception of hip joint prosthesis. The holder has a housing that encloses a mechanism having, at a far end, a tool-engaging interface, and at the opposite end, a handle which facilitates manipulation of the tool during use in preparing a bone site by the surgeon. The holder enables easy orientation of the tool attached to its end, which is important because control of the tool is critical in order to accurately prepare a recess for reception and installation of a prosthesis.

Abstract: A surgical instrument holder (10) is made up of a head assembly (68) and a drive spindle assembly (42). The head assembly (68) has a shank (12) with a first driveable end (14) and second coupling end (16). The second end has a coupling device (20) having an interface (22) for receiving a surgical instrument (24). The instrument (24) is held in functional assembly to the shank by a releasable locking mechanism (26). The releasable locking mechanism (26) is made up of a locking ring (30) slideably disposed about the shank, a spring (32) biased against the coupling device (20) by the locking ring, and a connection ring (34) retaining the locking ring in a fixed position during use. The drive spindle assembly (42) is connected to the head assembly (68) so as to transmit torque therethrough. The spindle assembly (42) has an elongated drive spindle (40), high precision bearings (44, 120, 122) and a cylindrical tube (46).

Abstract: A surgical instrument holder has a head assembly and a drive spindle assembly. The head has a second coupling end with a coupling device and interface for receiving and holding a surgical instrument. The instrument is held by a releasable locking mechanism having a ring slideably biased against the coupling device by a spring, and a connection device retaining the spring in a fixed position during use. The spindle assembly has a drive spindle rotatably housed in a cylindrical tube. The connection device provides a quick-release connection between the head and drive spindle assemblies, such that unlocking the connection device enables quick disassembly of the connection for cleaning and component sterilization. A method of use of the instrument holder allows the surgical instrument to be installed through an incision in a least invasive orientation separate from the holder.

Abstract: An acetabular reamer (10?) for cutting a required cut shape is described. The reamer (10?) has a cutting shell (12?) having a series of doubly curved cutting teeth (16?) thereon of a quantity to substantially reduce a cutting pressure on each tooth as well as to reduce a size of a typical chip generated upon cutting. Substantially all of the teeth have a matched arc cutting edge (20?) of substantial length that has a cutting profile which substantially matches a profile of a shape to be cut. The apertures in which the cutting edges are formed have at least one straight edge (80) by which a punch, used in the process of forming the edge, may be oriented. Such a configuration reduces the number of teeth required to cut the shape.

Abstract: An acetabular reaming system is disclosed of the type having a driver and a tool held together by a quick-release coupling mechanism. The tool (10) has a hollow body (12) defining a domed shape with a rotational axis (14), an apex (16) aligned with the axis (14) and a hemispherical wall (18) extending from the apex (16) to an equatorial rim (20) spaced 90 degrees from the axis (14). The rim (20) has an edge (22) visible to the user that indicates the position of the tool (10) relative to the bone. A first plurality of cutting sites (24) is arrayed along the body (12) and a second plurality of cutting sites (28) is arrayed circumferentially along the edge (22). Preferably, the first plurality of cutting sites (24) present raised first teeth (30, 130, 230, 330) having a profile selected from continuous squared (30), continuous rounded (130), discontinuous squared (230) and tongued (330) profiles.

Abstract: A guided reamer (10) has a central cannulation (12, 12a) adapted to receive a drill pin (14) secured in a manner which is axially aligned with the stem (22) of the bulbus bone joint (20). The reamer (10)has a profile cutting form (24) with cutting teeth (40) formed therein for cutting a form of a defined profile. The reamer (10) has a circumferential rim (34) having rim cutting teeth (36) disposed to cut to an outside of the rim and an inside of the rim, having face cutting teeth (37) adapted to cut an annular channel into bone and a plurality of planing teeth (52) radially disposed on an internal surface adjacent an axial end boss (44). The cannulation (12, 12a) is supported at the apex of the cutting form (24) and is formed in a guide assembly (70, 70?) affixed to the apex. The guide assembly (70, 70?) is adapted for imparting rotation to the reamer (12).

Abstract: An acetabular reamer (10) for cutting a required cut shape. The reamer has a cutting shell (12) having a series of doubly curved cutting teeth (16) thereon of a quantity to substantially reduce a cutting pressure on each tooth as well as to reduce a size of a typical chip generated upon cutting. Substantially all the teeth each have a matched arc cutting edge (20?) of substantial length that has a cutting profile which substantially matches a profile of a shape to be cut. Such a configuration reduces the number of teeth required to cut the shape.

Abstract: An acetabular reamer (10?) for cutting a required cut shape. The reamer has a cutting shell (12?) having a series of doubly curved cutting teeth (16?) thereon of a quantity to substantially reduce a cutting pressure on each tooth as well as to reduce a size of a typical chip generated upon cutting. Substantially all the teeth each have a matched arc cutting edge (20?) of substantial length that has a cutting profile which substantially matches a profile of a shape to be cut. The apertures in which the cutting edges are formed has at least one flat edge by which a punch, used in the process of forming the edge may be oriented. Such a configuration reduces the number of teeth required to cut the shape.

Abstract: An acetabular reamer (10) has a cutting structure (12) rotatable about a longitudinal axis (14) with a domed shell portion (16). The shell (16) has an outer surface (18) presenting multiple cutting sites (20) and an inner surface (22) for accumulation of debris. The shell (16) has a static insertion profile area that is defined by a pair of first curved portions (24) generated about a first radius (30) with a center that lies on the axis (14) and a pair of second curved portions (26) generated about a center that is spaced apart from the axis. The cutting structure (12) has a circular dynamic profile area generated upon rotation of the reamer (10) by a handle (40). Both the static insertion area and dynamic profile area lie transverse to the axis (14), the former being smaller than the latter.

Abstract: An acetabular reamer (10?) for cutting a required cut shape. The reamer has a cutting shell (12?) having a series of doubly curved cutting teeth (16?) thereon of a quantity to substantially reduce a cutting pressure on each tooth as well as to reduce a size of a typical chip generated upon cutting. Substantially all the teeth each have a matched arc cutting edge (20?) of substantial length that has a cutting profile which substantially matches a profile of a shape to be cut. Such a configuration reduces the number of teeth required to cut the shape.

Abstract: An acetabular reamer has a cutting structure rotatable about a longitudinal axis with a domed shell portion. The shell has an outer surface presenting multiple cutting sites and an inner surface for accumulation of debris. The shell has a static insertion profile area that is defined by a pair of first curved portions generated about a first radius with a center that lies on the axis and a pair of second curved portions generated about a center spaced apart from the axis. The cutting structure has a circular dynamic profile area generated upon rotation of the reamer by a handle. Both the static insertion area and dynamic profile area lie transferase to the axis, the former being smaller than the latter. Several distinctive alignment structures are described, alone and in combination with reamers having a conventional hemispherical shell, as well as in combination with present reamers that are less invasive.

Abstract: An acetabular reamer (10?) for cutting a required cut shape. The reamer has a cutting shell (12?) having a series of doubly curved cutting teeth (16?) thereon of a quantity to substantially reduce a cutting pressure on each tooth as well as to reduce a size of a typical chip generated upon cutting. Substantially all the teeth each have a matched arc cutting edge (20?) of substantial length that has a cutting profile which substantially matches a profile of a shape to be cut. Such a configuration reduces the number of teeth required to cut the shape.

Abstract: An adjustable reamer spindle is provided to aid a surgeon in controlling an instrument. The reamer spindle is easily disassembled for cleaning. The spindle has a repositionable handle, a locking ring, and an elastic device. The locking ring aids in holding the reamer spindle together. Removal of the locking ring against an elastic bias of a spring unfastens an end of the assembly in order to facilitate disassembly and/or cleaning. Adjustment of the position of the handle about the spindle enables the palm/grip of each hand to be changed in order to provide maximum control in different orientations.

Abstract: An adjustable reamer spindle is provided to aid the surgeon in controlling the instrument. The reamer spindle is easily disassembled for cleaning. The spindle has a repositionable handle, a locking ring, and an elastic device. The elastic device biases against a handle locking mechanism that locks the repositionable handle at angular positions about an axis of the spindle. The elastic device further biases a locking ring into a locked position. The locking ring aids in holding the reamer spindle together. Removal of the locking ring against an elastic bias of the elastic means unfastens an end of the assembly in order to facilitate disassembly and/or cleaning. Adjustment of the position of the handle about the spindle enables the palm/grip of each hand to be changed in order to provide maximum control in different orientations.

Abstract: A precision adjustable surgical tool holder/driver is provided which is easily disassembled for cleaning and precisely reassembled. The holder/driver has a positionable handle allowing adjustment of the position of the handle about the spindle of the holder to enable the “handedness” of the holder to be changed in order to accommodate a user while operating from the left or right side of the patient, standing behind or in-front of the patient, or for use in different surgical methods. The holder/driver includes a “limited-play” capture mechanism, which connects the drive end of the housing to its locking sleeve via a limited-play locking device. The limited-play locking device utilizes a disengageable, precision fitted bayonet pin and seat combination in part to accomplish the precision reassembly feature of the present invention.

Abstract: A precision adjustable surgical tool holder/driver is provided which is easily disassembled for cleaning and precisely reassembled. The holder/driver has a positionable handle allowing adjustment of the position of the handle about the spindle of the holder to enable the “handedness” of the holder to be changed in order to accommodate a user while operating from the left or right side of the patient, standing behind or in-front of the patient, or for use in different surgical methods. The holder/driver includes a “limited-play” capture mechanism, which connects the drive end of the housing to its locking sleeve via a limited-play locking device. The limited-play locking device utilizes a disengageable, precision fitted bayonet pin and seat combination in part to accomplish the precision reassembly feature of the present invention.

Abstract: An acetabular impactor aids a surgeon in controlling the installation of an acetabular cup prosthesis having a central, female aperture. The impactor includes an impactor head, housing and a locking mechanism. The housing is attached to the impactor head, the housing enclosing a drive train having, at a far end, a prosthesis engaging thread, and at the opposite end, a handle which facilitates turning of the drive train by the operator. The locking mechanism is associated with the housing which selectively locks the drive train, and thus the prosthesis, in position. The opposite end of the drive train has a latch device which enables quick removal from the housing for cleaning and sterilization.