Patent Description:
Joint arthroplasty is a well-known surgical procedure by which a diseased and/or damaged natural joint is replaced by a prosthetic joint. For example, in a hip arthroplasty surgical procedure, a patient's natural hip ball and socket joint is partially or totally replaced by a prosthetic hip joint. A typical prosthetic hip joint includes an acetabular prosthetic component and a femoral head prosthetic component. An acetabular prosthetic component generally includes an outer shell configured to engage the acetabulum of the patient and an inner bearing or liner coupled to the shell and configured to engage the femoral head. The femoral head prosthetic component and inner liner of the acetabular component form a ball and socket joint that approximates the natural hip joint.

Typical joint arthroplasty surgical procedures include impaction of surgical instruments (e.g., broaches, chisels, or other cutting tools) and/or prosthetic implants into the patient's bone. Historically, impaction has been performed by an orthopaedic surgeon manually striking a surgical instrument using a surgical mallet or hammer. Such manual impaction can be unpredictable and imprecise. Additionally, typical manual impaction instruments may require the surgeon to hold the instrument with one hand and strike the instrument with a mallet held in the surgeon's other hand.

Certain automated surgical impactors are capable of performing a series of percussive impacts that each provide a controlled amount of impaction energy. An automated surgical impactor may be used with one or more adapters to connect to various surgical instruments and/or implants. Typical adaptors connect to the surgical instrument and/or implant using a rigid drive train including one or more drive shafts, gear trains, or other rigid mechanical connections. <CIT> describes a surgical inserter that includes a shaft, a lever, a bolt and a locking mechanism. The shaft includes a shaft body and an enlarged head such that the locking mechanism is movably disposed on the end of the shaft body for locking and releasing angular movement relative to the shaft body.

According to one aspect, an orthopaedic surgical instrument includes an elongated body extending from a first end to a second end, a slideable bolt, a carrier slideably coupled to the elongated body, an elongated lever that extends from a pivot end to a latch end, a leaf spring, and a pushbutton catch coupled to the elongated body. The first end of the elongated body is configured to be received by an automated surgical impactor. The slideable bolt includes a head and a threaded body positioned at the second end of the elongated body. The threaded body extends outward from the second end of the elongated body. A notch defined in the carrier engages the head of the slideable bolt. The pivot end of the elongated lever is pivotally coupled to the elongated body. The leaf spring has a first end that is pivotally coupled to the lever and a second end that is pivotally coupled to the carrier such that movement of the lever causes movement of the carrier. The lever is movable between a first position in which the latch end is spaced apart from the elongated body and a second position in which the latch end is captured by the pushbutton catch. In the second position the leaf spring urges the carrier inward away from the implant end, and in the second position the carrier pulls the head of the bolt inward away from the implant end.

In an embodiment, the elongated body includes a straight segment, an angled segment, and an offset segment. The straight segment extends from the first end to the angled segment, the angled segment extends from the straight segment to the offset segment, and the offset segment extends from the angled segment to the second end. In an embodiment, a centerline of the first end is offset by a predetermined distance from a center of the slideable bolt. In an embodiment, the predetermined distance is <NUM> millimeters.

In an embodiment, the elongated body includes a top surface having an elongated opening defined therein, a bottom surface opposite the top surface and having an elongated opening defined therein, one or more inner walls extending between the elongated opening defined in the top surface and the elongated opening defined in the bottom surface, and a first cavity defined by the one or more inner walls. The pivot end of the elongated lever is pivotally coupled to the elongated body within the first cavity, and the latch end of the elongated lever extends out of the first cavity through the elongated opening defined in the top surface. The leaf spring is positioned within the first cavity. When the elongated lever is in the second position the carrier pulls the head of the bolt inward toward the first cavity.

In an embodiment, the elongated body includes a convex front surface positioned on the second end of the elongated body. A circular aperture is defined in the convex front surface, and the circular aperture opens into the first cavity. The threaded body of the slideable bolt extends outward from the second end through the circular aperture.

In an embodiment, the elongated body includes a first cross member positioned within the first cavity and coupled between the inner walls. A top surface of the first cross member defines a guideway to the head of the slideable bolt, wherein the guideway is in communication with the first cavity. In an embodiment, the orthopaedic surgical instrument further includes a second spring coupled between the elongated lever and the elongated body. The second spring biases the elongated lever in the first position. In an embodiment, the elongated body includes a second cross member positioned within the first cavity and coupled between the inner walls. The second spring is positioned between the pivot end of the lever and a bottom surface of the second cross member. In an embodiment, the elongated lever includes a stop extending outward from a top surface of the elongated lever. When the elongated lever is in the first position the stop contacts the bottom surface of the second cross member.

In an embodiment, the carrier includes an elongated body having a rail that surrounds a front and sides of the carrier. An elongated aperture is defined in the bottom surface of the elongated body, the elongated aperture extending from the elongated opening in the bottom surface toward the second end. An inner wall extends inward from the elongated opening into the first cavity, and a groove is defined in the inner wall surrounding the elongated aperture. The rail of the carrier is positioned in the groove.

In an embodiment, the elongated body includes a first side wall and a second side wall opposite the first side wall, an opening defined in the first side wall, one or more inner walls extending inwardly from the opening in the first side wall, wherein the one or more inner walls define a second cavity, and a second opening defined in the top surface between the first end and the elongated opening, wherein the second opening opens into the second cavity. The pushbutton catch is positioned in the second cavity. When the elongated lever is in the second position, a latch extending downward from the latch ending is positioned in the second cavity and retained by the pushbutton catch. In an embodiment, the pushbutton catch is moveable between a first position in which the pushbutton catch engages the latch positioned within the second cavity and a second position in which the pushbutton catch does not engage the latch. In an embodiment, the orthopaedic surgical instrument further includes a second spring positioned in the second cavity. The second spring is configured to bias the pushbutton catch in the first position.

In an embodiment, the pushbutton catch includes a button surface positioned toward the first side wall of the elongated body, a pair of side walls extending from the button surface into the second cavity, a back wall that connects the pair of side walls, and a catch that extends from the back wall into the second cavity. In an embodiment, the latch of the elongated lever includes a first cam surface, and the catch of the pushbutton catch includes a second cam surface. When the elongated lever is moved from the first position to the second position, the first cam surface engages the second cam surface. When the first cam surface engages the second cam surface, the pushbutton catch is urged from the first position to the second position.

The present orthopaedic surgical instrument may be used in a method for performing an orthopaedic surgical procedure includes securing an acetabular shell component to a first end of an orthopaedic surgical instrument; moving a lever of the orthopaedic surgical instrument from a first position to a second position in response to securing the acetabular shell component to the first end, wherein moving the lever from the first position to the second position comprises latching the lever in the second position and applying tension with a compliant member of the orthopaedic surgical instrument on the acetabular shell component against the first end; and coupling a second end of the orthopaedic surgical instrument to an automated surgical impactor in response to moving the lever.

Securing the acetabular shell component to the first end may comprise threading a central threaded hole of the acetabular shell component onto a threaded body of a slideable bolt of the orthopaedic surgical instrument, wherein the threaded body extends outward from the first end of the orthopaedic surgical instrument; positioning a driver tool in a guideway defined by a top surface of the orthopaedic surgical instrument in response to threading the central threaded hole onto the threaded body; and tightening a head of the slideable bolt with the driver tool in response to positioning the driver tool.

A method of using the present concept may further include adjusting a rotational position of the acetabular shell component in response to securing the acetabular shell component to the first end; wherein moving the lever further comprises moving the lever in response to adjusting the rotational position.

A method of using the present concept may further include impacting the acetabular shell component with the automated surgical impactor into a surgically prepared acetabulum of a patient in response to coupling the second end to the automated surgical impactor; depressing a pushbutton catch of the orthopaedic surgical instrument in response to impacting the acetabular shell component, wherein depressing the pushbutton catch comprises unlatching the lever from the second position and releasing tension with the compliant member; and releasing the acetabular shell component from the first end of the orthopaedic surgical instrument in response to depressing the pushbutton catch.

The detailed description particularly refers to the following figures, in which:.

While the concepts of the present disclosure are susceptible to various modifications and alternative forms, specific exemplary embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the concepts of the present disclosure to the particular forms disclosed, but on the contrary, the intention is to cover all modifications and alternatives falling within the scope of the invention as defined by the appended claims.

Terms representing anatomical references, such as anterior, posterior, medial, lateral, superior, inferior, etcetera, may be used throughout the specification in reference to the orthopaedic implants and orthopaedic surgical instruments described herein as well as in reference to the patient's natural anatomy. Such terms have well-understood meanings in both the study of anatomy and the field of orthopaedics. Use of such anatomical reference terms in the written description and claims is intended to be consistent with their well-understood meanings unless noted otherwise. Additionally, it is to be understood that terms such as top, bottom, front, rear, side, height, length, width, upper, lower, and the like that may be used herein merely describe points of reference and do not necessarily limit embodiments of the present disclosure to any particular orientation or configuration.

Referring now to <FIG>, an offset acetabular shell impactor adapter <NUM> (hereinafter impactor adapter <NUM>) is shown. The impactor adapter <NUM> is an orthopaedic surgical instrument; that is, a surgical tool used by a surgeon in performing an orthopaedic surgical procedure. As such, it should be appreciated that, as used herein, the terms "orthopaedic surgical instrument" and "orthopaedic surgical instruments" are distinct from orthopaedic implants or prostheses that are surgically implanted in the body of the patient. As described further below, the impactor adapter <NUM> may be used with an automated surgical impactor to seat an acetabular shell component into a patient's surgically prepared acetabulum.

As shown in <FIG>, the impactor adapter <NUM> includes an elongated, offset body <NUM> extending from an impactor attachment end <NUM> to an implant end <NUM>. As described further below, in use the impactor end <NUM>, also called the distal end or the rear end, may be attached to an automated surgical impactor tool. Similarly, in use, the implant end <NUM>, also called the proximal end, the tip end, or the front end, may be attached to an acetabular shell component or other prosthetic implant.

In the illustrative embodiment, the body <NUM> is formed from a metallic material, such as, for example, stainless steel or cobalt chromium. The elongated body <NUM> includes a straight segment <NUM> positioned at the impactor end <NUM>, an angled segment <NUM>, and an offset segment <NUM> positioned at the implant end <NUM>. The straight segment <NUM> defines a straight segment axis <NUM> and the offset segment <NUM> defines an offset segment axis <NUM>. The angled segment <NUM> extends such that the axes <NUM>, <NUM> are offset by a distance <NUM>, which is illustratively <NUM> millimeters. The illustrative offset, elongated body <NUM> may be used with a direct anterior approach (DAA) surgical procedure for performing hip arthroplasty.

Each of the segments <NUM>, <NUM>, <NUM> are generally rectangular in cross section and thus have a top surface <NUM> and a bottom surface <NUM> positioned opposite the top surface <NUM>, as well as a pair of side surfaces <NUM>, <NUM>. A pair of elongated openings <NUM>, <NUM> are defined in each of the top surface <NUM> and the bottom surface <NUM>, respectively. One or more inner walls <NUM> extend between the openings <NUM>, <NUM> through the body <NUM> and define a cavity <NUM> inside the body <NUM>. A top cross member <NUM> and a middle cross member <NUM> are positioned within the cavity <NUM> between the inner walls <NUM>. Each cross member <NUM>, <NUM> has a curved upper surface <NUM>.

The implant end <NUM> includes a convex surface <NUM> with a central circular aperture <NUM> defined thereon. An inner wall <NUM> extends inward from the central circular aperture <NUM>, defining a passageway <NUM> that extends into the interior cavity <NUM>. A boss <NUM> surrounds the circular aperture <NUM> and extends outward from the convex surface <NUM>.

As shown in the cross-sectional views of <FIG> and <FIG>, a slideable bolt <NUM> is positioned in the circular aperture <NUM>. The bolt <NUM> includes a threaded body <NUM> and a head <NUM>. The head <NUM> includes a top surface <NUM> that defines a pocket configured to receive a fastening tool. Illustratively, the top surface <NUM> includes a hex shape configured to receive a manual ball-end hex driver; however, in other embodiments the bolt <NUM> may be configured to receive any other suitable screwdriver or fastening tool. The curved upper surfaces <NUM> of the cross members <NUM>, <NUM> and the inner walls <NUM> of the body <NUM> cooperate to define a guideway <NUM> that leads to the pocket defined in the top surface <NUM> of the bolt <NUM>. The threaded body <NUM> extends outward from the implant end <NUM> through the circular aperture <NUM>, and the bolt <NUM> is slideable inward and outward relative to the implant end <NUM>. A collar <NUM> surrounds the bolt <NUM>. The collar <NUM> has a larger diameter than the circular aperture <NUM>, thereby retaining the bolt <NUM> within the body <NUM>.

Referring again to <FIG>, the impactor adapter <NUM> includes an elongated latch lever <NUM> that extends outward from the cavity <NUM> through the opening <NUM> formed in the top surface <NUM>. The latch lever <NUM> includes a pivot end <NUM> that is pivotally mounted to the body <NUM> within the cavity <NUM>. Illustratively, a bore <NUM> is defined through the pivot end <NUM>, and a pair of circular openings <NUM> are defined through the side surfaces <NUM>, <NUM> of the body <NUM>. The bore <NUM> encompasses the pivot point of the latch lever <NUM>. A pin <NUM> is positioned in the bore <NUM> and the openings <NUM> such that the latch lever <NUM> is joined with the body <NUM> and allowed to rotate about the pin <NUM>. In the illustrative embodiment, the pin <NUM> is press-fit into the openings <NUM>; however, any suitable method of securing the pin <NUM> may be used.

The pivot end <NUM> further includes an upper surface <NUM> having a pin <NUM> extending outward from the upper surface <NUM>. The pin <NUM> is captured within a helical spring <NUM>. The spring <NUM> is itself retained within a pocket <NUM> defined in a lower surface <NUM> of the top cross member <NUM>. The spring <NUM> urges against the lower surface <NUM> and the upper surface <NUM>, which biases the latch lever <NUM> toward an open position as shown in <FIG>.

The latch lever <NUM> further includes a neck <NUM> extending from the pivot end <NUM> toward a lever body <NUM>. A top fin <NUM> extends outward from the neck <NUM>. As the lever <NUM> reaches the fully open position, the fin <NUM> contacts a back surface <NUM> of top cross member <NUM>. Thus, the fin <NUM> operates as a stop that limits range of motion for the lever <NUM>. The throw of the lever <NUM>, that is, the angle between the body <NUM> of the lever <NUM> and the straight segment <NUM> of the body <NUM> when the lever <NUM> is in the fully open position, may be limited to less than about <NUM>-<NUM> degrees.

The body <NUM> of the latch lever <NUM> extends toward a latch end <NUM>. The latch end <NUM> includes a latch <NUM> extending downward from the lever body <NUM>. As shown in the cross-sectional view of <FIG>, the latch <NUM> includes a lower cam surface <NUM> and an upper surface <NUM> extending inward toward the interior of the body <NUM>. As described further below, when the lever <NUM> is in a latched position as shown in <FIG>, the latch <NUM> of the latch lever <NUM> may be captured within the body <NUM> by a pushbutton catch mechanism. In the latched position, the body <NUM> of the lever <NUM> may contact the top surface <NUM> of the body <NUM>, operating as a stop that limits range of motion of the lever <NUM>. As described above, the latch lever <NUM> is moveable between the open position as shown in <FIG> and the latched position shown in <FIG>.

The body <NUM> further includes an aperture <NUM> defined in the bottom surface <NUM>. The aperture <NUM> extends from the opening <NUM> toward the implant end <NUM>. An inner wall <NUM> extends from the aperture <NUM> into the cavity <NUM>. A groove <NUM> is defined in the inner wall <NUM> surrounding the aperture <NUM>.

A bolt carrier <NUM> is positioned within the aperture <NUM>. The bolt carrier <NUM> includes an upper surface <NUM> having a notch <NUM> defined thereon. As shown in <FIG> and <FIG>, the notch <NUM> is sized to receive the head <NUM> of the bolt <NUM>. A rail <NUM> surrounds the sides and front of the carrier <NUM>, and a tang <NUM> extends from the rear of the carrier <NUM>. A bore <NUM> is defined through the tang <NUM>. When the bolt carrier <NUM> is positioned in the aperture <NUM>, the rail <NUM> is received in the groove <NUM> defined in the inner wall <NUM>. The carrier <NUM> is slideable toward and away from the impactor end <NUM> when captured within the groove <NUM>. Because the head <NUM> of the bolt <NUM> is captured by the carrier <NUM>, when the carrier <NUM> slides toward the impactor end <NUM>, the bolt <NUM> also slides in that same direction, thereby retracting the threaded body <NUM> of the bolt <NUM> into the body <NUM> through the circular aperture <NUM>.

The impactor adapter <NUM> further includes a leaf spring <NUM> or other compliant connective member that connects the latch lever <NUM> and the bolt carrier <NUM>. The leaf spring <NUM> includes a flexible body <NUM> that extends between ends <NUM>, <NUM>. The end <NUM> is pivotally coupled to the pivot end <NUM> of the latch <NUM>, and the end <NUM> is pivotally coupled to the tang <NUM> of the carrier <NUM>. Illustratively, each of the ends <NUM>, <NUM> includes a fork <NUM> that extends to a pair of mounting plates <NUM>. A circular opening <NUM> is defined through each mounting plate <NUM>. The mounting plates <NUM> of the end <NUM> surround a bore <NUM> defined through the pivot end <NUM> of the lever. A pin <NUM> is positioned in the openings <NUM> and the bore <NUM> to pivotally couple the end <NUM> to the lever <NUM>. Similarly, the mounting plates <NUM> of the end <NUM> surround the bore <NUM> defined through the carrier <NUM>, and a pin <NUM> is positioned in the openings <NUM> and the bore <NUM> to pivotally couple the end <NUM> to the carrier <NUM>.

When the lever <NUM> is in the open position (as shown in <FIG>), the leaf spring <NUM> has a relaxed, doubly arcuate shape. When the lever <NUM> is moved to the latched position (as shown in <FIG>), the leaf spring <NUM> has a relatively extended and flattened shape, causing the leaf spring <NUM> to be in tension. When in tension, the leaf spring <NUM> urges the carrier <NUM> to slide back in the groove <NUM> toward the impactor end <NUM>. The carrier <NUM>, in turn, pulls the slideable bolt <NUM> back toward the impactor end <NUM>. Tension on the leaf spring <NUM> may be released by moving the lever <NUM> from the latched position to the open position as described further below.

As shown in <FIG>, an opening <NUM> is defined in the side surface <NUM> of the body <NUM>. The opening <NUM> is positioned between the cavity <NUM> and the impactor end <NUM> on the straight segment <NUM> of the body <NUM>. One or more inner walls <NUM> extend inwardly from the opening <NUM>, defining a cavity <NUM>. An additional opening <NUM> is defined in the top surface <NUM>. A passageway extends through the opening <NUM> into the cavity <NUM>.

A pushbutton catch <NUM>, also referred to as a button <NUM>, is positioned within the cavity <NUM>. As described further below, the pushbutton catch <NUM> may be used to selectively retain the latch lever <NUM> in the latched position shown in <FIG>. The pushbutton catch <NUM> includes a button surface <NUM> positioned toward the side surface <NUM> of the body <NUM>. The button surface <NUM> is configured to be pressed by a surgeon and thus may be textured or otherwise configured to provide additional grip. Additionally, as shown in <FIG>, in ordinary operation the button surface <NUM> may be flush with the side surface <NUM> and/or recessed within the cavity <NUM> in order to prevent unintentional operation.

The pushbutton catch <NUM> further includes a pair of side walls <NUM> that extend inward from the button surface <NUM> into the cavity <NUM>. The side walls are connected by a back wall <NUM>. Together, the button surface <NUM>, the side walls <NUM>, and the back wall <NUM> surround a button cavity <NUM>. A catch <NUM> extends upward from the back wall <NUM> and inward into the button cavity <NUM>. The catch <NUM> includes an upper cam surface <NUM> and a lower surface <NUM>. A guide pin <NUM> extends from a back surface <NUM> of the catch <NUM> toward the other side surface <NUM>. A helical spring <NUM> is retained between the body <NUM> and the back surface <NUM> of the catch <NUM>, and the guide pin <NUM> is captured within the spring <NUM>. The spring <NUM> urges against the body <NUM> and the back surface <NUM> to bias the pushbutton catch <NUM> toward the opening <NUM> in the side surface <NUM>. A stop pin <NUM> extending into the latch cavity <NUM> is positioned in a hole defined through the bottom surface <NUM> of the body <NUM>. When the pushbutton catch <NUM> is positioned in the cavity <NUM>, the stop pin <NUM> also extends into the button cavity <NUM>. The stop pin <NUM> thus engages the back wall <NUM> of the pushbutton catch <NUM> and retains the pushbutton catch <NUM> within the cavity <NUM> of the body <NUM>.

As shown in <FIG>, when the lever <NUM> is in the latched position, the latch <NUM> extends into the cavity <NUM> and the button cavity <NUM>. The upper surface <NUM> of the latch <NUM> engages the lower surface <NUM> of the catch <NUM>, thereby retaining the latch <NUM> within the button cavity <NUM>. When the surgeon or other user depresses the button surface <NUM>, the pushbutton catch <NUM> slides toward the side surface <NUM>, and the lower surface <NUM> of the catch <NUM> slides off the upper surface <NUM>, releasing the latch <NUM>. As described above, the spring <NUM> biases the latch lever <NUM> to the open position. Thus, when the latch <NUM> is released, the latch end <NUM> of the lever <NUM> automatically swings out of the cavity <NUM> toward the open position, which releases tension on the leaf spring <NUM>.

When a surgeon or other user moves the lever <NUM> from the open position to the latched position without depressing the pushbutton catch <NUM>, the lower cam surface <NUM> of the latch <NUM> engages the upper cam surface <NUM> of the catch <NUM>. This engagement of the cam surfaces <NUM>, <NUM> forces the pushbutton catch <NUM> to slide toward the side surface <NUM>, allowing the latch <NUM> to enter the button cavity <NUM>. When the latch <NUM> passes the catch <NUM> and the cam surfaces <NUM>, <NUM> disengage, the spring <NUM> forces the pushbutton catch <NUM> to slide back toward the side surface <NUM>, which causes the lower surface <NUM> of the catch <NUM> to retain the upper surface <NUM> of the latch <NUM>. Accordingly, the latch lever <NUM> may be opened and/or closed by the surgeon using a single hand.

As shown in <FIG>, the impactor end <NUM> includes a shank <NUM>, which is configured to be received by an automated surgical impactor. The illustrative shank <NUM> includes a pin <NUM> and a flange <NUM>. The shank <NUM> is configured to be impacted by the automated surgical impactor in either a forward direction (i.e., to advance the impactor adaptor <NUM> toward the patient's bone) or a reverse direction (i.e., to back the impactor adaptor <NUM> out of the patient's bone). In other embodiments, it should be understood that the shank <NUM> may include any other configuration of pins, flanges, and/or other features configured to captured and/or impacted by the automated surgical impactor. The illustrative shank <NUM> further includes an indicator groove <NUM>, which marks a depth at which the shank <NUM> is fully seated within the automated surgical impactor.

The body <NUM> further includes a round segment <NUM> positioned between the shank <NUM> and the pushbutton catch <NUM>. The round segment <NUM> is configured as an attachment point for an inclination guide and/or a combined inclination and alignment guide. Additionally or alternatively, in some embodiments the body <NUM> may include one or more mounting brackets or other features configured to support attachment of additional orthopaedic surgical instruments.

The impactor adapter <NUM> may be utilized during the performance of an orthopaedic surgical procedure similar to that shown in <FIG>. Initially, the surgeon surgically prepares the patient's bone to receive an acetabular shell component. To do so, the surgeon may utilize a surgical reamer to prepare the patient's acetabulum to receive the shell component. After preparing the patient's bone, and as shown in <FIG>, the surgeon attaches an acetabular shell component <NUM> to the impactor adapter <NUM>. The shell component <NUM> includes a domed outer surface <NUM> that is configured to be implanted in the patient's acetabulum. The outer surface <NUM> is illustratively semi-hemispherical, although in other embodiments the outer surface <NUM> may have any appropriate shape. The shell component <NUM> further includes an inner surface <NUM> positioned opposite the outer surface <NUM>. A threaded central opening <NUM> is defined through the inner surface <NUM> and the outer surface <NUM>.

As shown in <FIG>, the lever <NUM> of the impactor adapter <NUM> is initially in the open position. When the lever <NUM> is in the open position, the leaf spring <NUM> urges the carrier <NUM> to slide forward toward the implant end <NUM> within the groove <NUM>, which causes the threaded body <NUM> of the bolt <NUM> to extend outward through the circular aperture <NUM> defined in the convex surface <NUM> of the body <NUM>. As shown in <FIG>, the surgeon threads the threaded central opening <NUM> of the shell component <NUM> onto the threaded body <NUM> of the bolt <NUM>, which extends outward from the implant end <NUM> of the body <NUM> as described above. The surgeon secures the shell component <NUM> to the implant adapter <NUM> by tightening the bolt <NUM> using a ball-end hex driver <NUM>. As shown in <FIG>, the surgeon inserts a shaft <NUM> of the hex driver <NUM> through the guideway <NUM> formed by the upper surfaces <NUM> of the cross members <NUM>, <NUM> and the inner walls <NUM> of the body <NUM>. A tip <NUM> of the hex driver <NUM> contacts the head <NUM> of the bolt <NUM>, allowing the surgeon to manually tighten the bolt <NUM>. The surgeon may tighten the bolt <NUM> by hand until feeling a torque response or otherwise feeling resistance. The bolt <NUM> may not need to be fully tightened or otherwise tightened to any particular amount of torque.

After securing the shell component <NUM> to the impactor adapter <NUM>, the surgeon removes the hex driver <NUM>. The surgeon may rotate the shell component <NUM> about its central opening <NUM> in order to achieve a desired rotational position. As the bolt <NUM> is not fully tightened, the bolt <NUM> may also rotate with the shell component <NUM>.

After securing and optionally positioning the shell component <NUM>, the surgeon moves the latch lever <NUM> from the open position to the latched position, as shown in <FIG>. As the latch lever <NUM> is moved to the latched position, the leaf spring <NUM> is extended and placed in tension. As the leaf spring <NUM> is placed in tension, the leaf spring <NUM> exerts a force on the carrier <NUM>, pulling the carrier <NUM> back toward the impactor end <NUM>. The carrier <NUM>, in turn, exerts force on the bolt <NUM>, which exerts force on the attached shell component <NUM>. The force pulls the inner surface <NUM> of the shell component <NUM> fast against the boss <NUM> positioned on the implant end <NUM> of the body. The shell component <NUM> is thus held rigid and immobile against the implant adapter <NUM>. As described above, when the latch lever <NUM> is in the latched position, the pushbutton catch <NUM> retains the latch <NUM>, ensuring that the latch lever <NUM> remains in the latched position and that the shell component <NUM> remains rigidly attached to the impactor adaptor <NUM>. Additionally, as the latch lever <NUM> is retained by the pushbutton catch <NUM>, the leaf spring <NUM> is not extended to an over-center position in order to retain the latch lever <NUM>. Thus, the impactor adapter <NUM> may have reduced wear and increased longevity as compared to impaction tools that use an over-center clamp function.

After latching the impactor adapter <NUM>, the surgeon or other user attaches the impactor end <NUM> of the impactor adapter <NUM> to an automated surgical impactor <NUM> as shown in <FIG>. Additionally or alternatively, in some embodiments the impactor adapter <NUM> may be attached to the automated surgical impactor <NUM> before being attached to the shell component <NUM>.

The automated surgical impactor <NUM> may be embodied as a Kincise™ surgical automated system component commercially available from DePuy Synthes of Warsaw, Indiana. In the illustrative embodiment, the automated surgical impactor <NUM> includes an impactor body <NUM> having a twist-lock collar <NUM> and a battery pack <NUM>. Electrical drive components <NUM> are housed within the impactor body <NUM>. The impactor body <NUM> further includes a primary hand grip <NUM>, a secondary hand grip <NUM>, and a trigger <NUM>.

In use, the surgeon inserts the shank <NUM> of the impactor adapter <NUM> into the twist-lock collar <NUM> and then locks the collar <NUM> on to the shank <NUM>. Holding the primary hand grip <NUM> and/or the secondary hand grip <NUM>, the surgeon inserts the shell component <NUM> into the surgically prepared acetabulum <NUM> of the patient as shown in <FIG>. After positioning the shell component <NUM>, the surgeon depresses the trigger <NUM>, which causes the electrical drive components <NUM> to generate a series of controlled percussive impacts on the impactor adapter <NUM> using electrical energy provided by the battery pack <NUM>. The impactor adaptor <NUM> communicates impaction force from those percussive impacts to the shell component <NUM>, thereby implanting the shell component <NUM> into the patient's acetabulum <NUM>. During impaction, the surgeon's hands may remain on the automated surgical impactor <NUM>, and the latch lever <NUM> remains in the latched position. Additionally, the leaf spring <NUM> retains the shell component <NUM> rigidly against the impactor adaptor <NUM> during impaction. Unlike adapters using a typical rigid drive train attachment mechanism, the compliant, flexible leaf spring <NUM> of the impactor adapter <NUM> may not back out or otherwise loosen during impaction, even when subject to frequent, lower-amplitude impactions generated by the automated surgical impactor <NUM>.

After the shell component <NUM> has been fully impacted into the patient's acetabulum <NUM>, the surgeon removes the impactor adaptor <NUM> from the shell component <NUM>. To do so, the surgeon depresses the button surface <NUM> of the pushbutton catch <NUM>, causing the pushbutton catch <NUM> to slide into the cavity <NUM> in the body <NUM>. As the pushbutton catch <NUM> slides into the cavity <NUM>, the lower surface <NUM> disengages the upper surface <NUM> of the latch <NUM>, which releases the latch end <NUM> of the latch lever <NUM>. The spring <NUM> causes the lever <NUM> to swing open to the open, unlatched position. In the open position, tension on the leaf spring <NUM> is released and the leaf spring <NUM> does not exert a force on the carrier <NUM> toward the impactor end <NUM>. The carrier <NUM>, in turn, stops exerting force on the bolt <NUM> toward the impactor end <NUM>. Accordingly, the surgeon is able to unlatch the impactor adapter <NUM> with one hand.

Claim 1:
An orthopaedic surgical instrument for use with an acetabular implant, the orthopaedic surgical instrument comprising:
an elongated body (<NUM>) extending from a first end to a second end, wherein the first end is configured to be received by an automated surgical impactor (<NUM>);
a slideable bolt (<NUM>) comprising a head (<NUM>) and a threaded body (<NUM>) positioned at the second end of the elongated body (<NUM>), wherein the threaded body (<NUM>) extends outward from the second end of the elongated body (<NUM>);
a carrier (<NUM>) slideably coupled to the elongated body (<NUM>), wherein a notch (<NUM>) defined in the carrier (<NUM>) engages the head (<NUM>) of the slideable bolt (<NUM>);
an elongated lever (<NUM>) that extends from a pivot end (<NUM>) to a latch end (<NUM>), wherein the pivot end (<NUM>) is pivotally coupled to the elongated body (<NUM>);
a pushbutton catch (<NUM>) coupled to the elongated body (<NUM>), wherein the lever is movable between a first position in which the latch end (<NUM>) is spaced apart from the elongated body (<NUM>) and a second position in which the latch end (<NUM>) is captured by the pushbutton catch (<NUM>);
characterised by a leaf spring (<NUM>) having a first end that is pivotally coupled to the lever and a second end that is pivotally coupled to the carrier (<NUM>) such that movement of the lever causes movement of the carrier (<NUM>),
wherein in the second position the leaf spring (<NUM>) urges the carrier (<NUM>) inward away from the implant end, and wherein in the second position the carrier (<NUM>) pulls the head (<NUM>) of the bolt inward away from the implant end.