Adjustable reamer driver and impactor and method of making the same

Abstract

14. The apparatus of claim 13, wherein the plurality of actuators are configured to extend along a first end of the drive shaft and a second end of the drive shaft to extend along a first axis of the drive shaft. The plurality of actuators are configured to extend along a first axis of the drive shaft and a second end of the drive shaft to extend along a first axis of the drive shaft. The plurality of actuators are configured to extend along a first axis of the drive shaft and a second end of the drive shaft to extend along a first axis of the drive shaft. The plurality of actuators are configured to extend along a first axis of the drive shaft and a second end of the drive shaft to extend along a first axis of the drive shaft

Description

[0001] The present invention relates to adjustable reamer drivers and impactors, methods of preparing the drivers and impactors for use, and methods of reaming and impacting using the reamer drivers and impactors. Background Art

[0002] Humans and animals have various joints in their bodies, such as ankles, knees, hips, shoulders, and elbows. A joint is where two or more bones meet. Many joints allow movement between these two or more bones.

[0003] Cartilage is commonly found between joints in the body that allow movement. Cartilage provides lubrication for movement and absorbs some of the forces experienced by the joint.

[0004] Cartilage can wear away over time. As a result, the bones that make up a joint can come into contact, leading to pain and reduced joint function. Another cause of joint damage is arthritis. Arthritis, such as arthritis, is a joint disease that can cause symptoms such as pain, stiffness, and swelling.

[0005] One option for treating damaged joints is to replace the degenerated or diseased joint parts with a prosthesis. A commonly used prosthesis is a total joint prosthesis. A total joint prosthesis replaces a natural or natural joint part with an artificial joint. For example, in a total hip replacement, a total hip replacement prosthesis can be used to replace the natural hip joint. A total hip replacement prosthesis consists of an artificial femoral component and an artificial acetabulum component.

[0006] During the surgical procedure to replace a joint, specialized instruments are used to prepare the joint to receive its corresponding component. One such instrument is a reamer. A reamer is an instrument used to remove the portion of bone to be replaced and can be used to shape the bone to receive the appropriate prosthetic component.

[0007] During a total hip replacement, a reamer and an impactor are used to prepare the recipient's acetabulum to receive the replacement cup prosthesis. The acetabular reamer is typically hemispherical and is used to prepare a correspondingly shaped cavity in the acetabulum. The impactor is often used to impact various components used in other parts of the procedure.

[0008] A U.S. patent application with patent publication number US 2016 / 175,112 discloses a known modular acetabular impactor and reamer system. The modular acetabular impactor and reamer system includes a body extending between a proximal handle end and a distal end. The system also includes a transmission device that rotates and extends within the body. The transmission device has an accessory mounting seat. The system also has at least one impactor handle and a reamer handle, which are removably connected to the proximal handle end of the body. The impactor handle has a drive shaft to drive rotation relative to the impactor handle. The reamer handle has a drive mounting seat to drive rotation relative to the reamer handle. The system also has at least one impactor cup and a reamer module, which are removably connected to the distal end of the body. The transmission device rotates relative to the body in correspondence with the at least one impactor cup and the reamer module.

[0009] This known modular acetabular impactor and reamer system has multiple components and can be complex to configure or switch between different operating modes. Summary of the Invention

[0010] According to a first aspect of the present invention, an instrument configurable as a reamer and an impactor includes a body, a driver, and an adjustable handle. The body includes a distal end spaced apart from a proximal end relative to a longitudinal axis. The body includes a handle coupler located near the proximal end. The body defines a passage extending between the distal end and the proximal end. The driver includes a first connector, a second connector, and a drive shaft. The first connector is positioned adjacent to the distal end of the body. The first connector is adapted to connect to a driven instrument, such as a reamer head. The second connector is positioned adjacent to the proximal end of the body. The second connector is adapted to connect to a driving instrument, such as a power tool. The drive shaft is disposed in the passage. The drive shaft couples the second connector to the first connector. The adjustable handle is positioned near the distal end of the body. The adjustable handle includes a grip portion spaced apart from a front end and a rear end along a handle axis. The front end couples the handle to the handle coupler. The rear end is shaped to define a strike plate. The adjustable handle is positionable relative to the body in a first position and a second position. In the first position, the front end is positioned relative to the handle coupler such that the handle axis is offset relative to the longitudinal axis. In the second position, the front end is arranged relative to the handle coupler such that the handle axis is parallel to the longitudinal axis.

[0011] One beneficial effect of the present instrument is that the same handle can be used for different procedures. Providing a single handle that allows the instrument to accommodate at least a first function and a second function allows for a less complex process for configuring the instrument for different purposes. For example, in one configuration, the handle adapts the instrument for use as a reamer, while in another configuration, it adapts the instrument for use as an impactor. This makes configuration easier and more efficient than known handles.

[0012] Preferably, in the second position, the impingement plate is perpendicular to the longitudinal axis.

[0013] Preferably, in the first position, the second connector is engageable by a driving instrument and the adjustable handle is graspable by a user to provide additional support.

[0014] Preferably, the adjustable handle is rotatably coupled to a handle coupling distal end of the main body.

[0015] Preferably, the adjustable handle is coupled to the handle coupler via a joint, the joint being configured to enable the adjustable handle to rotate between a first position and a second position.

[0016] Preferably, the adjustable handle is removable from the handle coupler such that the adjustable handle can be arranged in one of the first position or the second position.

[0017] Preferably, the handle coupler has a faceted groove and the front end of the adjustable handle is faceted. The front end of the adjustable handle can be removed from the faceted groove and, due to the facets, can be selectively arranged in the faceted groove in either the first position or the second position.

[0018] Preferably, the facet grooves and the facet front ends have the same polygonal shape when viewed in cross section.

[0019] Preferably, the instrument has a retaining mechanism for retaining the handle in the first position and the second position. Preferably, the retaining mechanism includes a latch for retaining the handle in one of the first position or the second position and a release mechanism for unlocking the latch so that the handle can move between the first position and the second position.

[0020] According to a second aspect of the present invention, an instrument having a body, a drive mechanism, and an actuator is provided. The body has a proximal end and a distal end. The body defines a channel extending from an opening in the proximal end to an opening in the distal end. The drive mechanism has a first coupler located near the proximal end, which is connected to a second coupler located near the distal end via a drive shaft located in the channel. The drive shaft is arranged to transfer a torque applied to one of the couplers to the other coupler. The actuator can be arranged between a first position and a second position relative to the first coupler. In the first position, the actuator is engaged with the first coupler and can be manipulated to transfer the applied torque to the first coupler. In the second position, the actuator is disengaged from the first coupler and cannot transfer torque to the first coupler.

[0021] According to a third aspect of the present invention, a method for preparing a device is provided. The method comprises the following steps:

[0022] Provide an apparatus comprising:

[0023] a body including a distal end spaced from the proximal end relative to the longitudinal axis and a handle coupler located adjacent the proximal end, the body defining a passage extending between the distal end and the proximal end, a driver including a first connector positioned adjacent the distal end and adapted to be connected to a driven instrument, a second connector positioned adjacent the proximal end and adapted to be connected to a driving instrument, and a drive shaft disposed in the passage, the drive shaft coupling the second connector to the first connector, and

[0024] an adjustable handle located near the distal end, the adjustable handle including a grip portion spacing a forward end from a rearward end along a handle axis, the forward end coupling the handle to the handle coupler, the rearward end shaped to define a strike plate; and arranging the adjustable handle in one of a first position or a second position.

[0025] In the first position, the adjustable handle may be arranged such that the forward end is arranged relative to the handle coupler such that the handle axis is offset relative to the longitudinal axis.

[0026] In the second position, the adjustable handle may be arranged such that the forward end is arranged relative to the handle coupler such that the handle axis is parallel to the longitudinal axis.

[0027] Preferably, in the second position, the impingement plate is perpendicular to the longitudinal axis.

[0028] Preferably, in the first position, the operator engages the second connector with the driving instrument and the adjustable handle is grasped by the operator.

[0029] Preferably, the adjustable handle is rotatably coupled to a handle coupling distal end of the main body.

[0030] Preferably, the adjustable handle is coupled to the handle coupler via a joint. The joint may be configured to enable the adjustable handle to rotate between a first position and a second position.

[0031] Preferably, the adjustable handle is removable from the handle coupler such that the adjustable handle can be arranged in one of the first position or the second position.

[0032] Preferably, the handle coupler includes a faceted groove and the front end of the adjustable handle is faceted. The front end of the adjustable handle can be removed from the faceted groove and, due to the facets, can be selectively arranged into the faceted groove in either the first position or the second position.

[0033] Preferably, the facet grooves and the facet front ends have the same polygonal shape when viewed in cross section.

[0034] Preferably, the instrument includes a retaining mechanism for retaining the handle in the first position and the second position. Preferably, the retaining mechanism includes a latch for retaining the handle in one of the first position or the second position. The method may include the step of depressing the latch to unlock a release mechanism such that the handle can be moved between the first position and the second position. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] For a more complete understanding of the present invention and its advantages, reference is made to the following description taken in conjunction with the accompanying drawings, in which:

[0036] Figure 1 shows a perspective view of a modular handle assembly according to a first embodiment of the present invention;

[0037] Figure 2 Shown Figure 1 A perspective view of the modular handle assembly of FIG. 100 is shown in an "impactor" configuration, showing an exploded view of the proximal handle grip;

[0038] Figure 3 Shown Figure 1 a side view of a proximal cross-section of the modular handle assembly;

[0039] Figure 4 Shown depiction Figure 1 A side view of the modular handle assembly in a "reamer" configuration;

[0040] Figure 5 Shown depiction Figure 2 A side view of the modular handle assembly in the "striker" configuration;

[0041] Figure 6 Shown Figures 1 to 5 a perspective view of the adjustable handle shown;

[0042] Figure 7 Shown Figures 1 to 5 An exploded perspective view of the modular handle assembly is shown;

[0043] Figure 8 Shown in Figure 4 a plan view of the grater attached to the modular handle during the "reamer" configuration shown;

[0044] Figure 9 An apparatus 2 according to a second embodiment of the invention is shown, depicting a "strike" configuration;

[0045] Figure 10 Shown in Figure 9 The sun gear arrangement beneath the housing assembly at the proximal end during the "impactor" configuration shown;

[0046] Figure 11An instrument 2 according to a second embodiment of the present invention is shown, showing a perspective view of the adjustable housing and depicting a "reamer" configuration;

[0047] Figure 12 Shown depiction Figure 10 A side view of the modular handle assembly in a "reamer" configuration;

[0048] Figure 13 Shown depiction Figure 9 A side view of the modular handle assembly in the "striker" configuration;

[0049] Figure 14 An instrument 3 of a third embodiment of the present invention is shown, depicting a "reamer" configuration;

[0050] Figure 15 A third embodiment of the invention is shown as an instrument 3 depicting a "strike" configuration. DETAILED DESCRIPTION

[0051] The present invention is a surgical instrument with multiple functions. In a first exemplary function, the instrument is used for reaming. In a second exemplary function, the instrument is used for impaction. To switch between one functional mode and the other, the instrument has an adjustable handle. The adjustable handle is repositionable between a first position and a second position. In the first position, the handle is positioned to facilitate reaming. In the second position, the handle is positioned to facilitate impaction.

[0052] The adjustable handle has a grip portion spaced apart from a front end and a rear end along a handle axis. The front end has a handle coupler that is configured to couple the adjustable handle to the instrument relative to a longitudinal axis extending from a proximal end to a distal end of the instrument. The handle coupler enables the handle to be adjusted between multiple functional modes. The rear end defines a strike plate.

[0053] The handle is adjustable relative to the longitudinal axis of the instrument between a first position and a second position. In the first position, the front end is arranged relative to the instrument such that the handle is offset relative to the longitudinal axis of the instrument. In the second position, the front end is arranged relative to the handle coupler such that the handle axis is parallel to the longitudinal axis.

[0054] When the handle is in the first position, the instrument is arranged in a reaming configuration.

[0055] When the handle is in the second position, the handle is arranged to be in an impact configuration. In this configuration, the impact plate located in the rear end is arranged to be struck by an operator with a surgical hammer.

[0056] The present invention provides an instrument with a reconfigurable handle that adapts the instrument to at least a first function and a second function. For example, in one configuration, the handle adapts the instrument to function as a reamer, while in another configuration, it adapts the instrument to function as an impactor. This handle allows for easier configuration and improves the efficiency of surgical procedures.

[0057] Figure 1 An instrument 1 according to a first embodiment of the invention is shown. The instrument 1 has a body 10 and a handle 80. The handle 80 is connected to the body 10 by a handle coupling 12. The handle coupling 12 enables the handle 80 to be arranged in a first position and a second position.

[0058] The body 10 has a distal end 14 spaced apart from a proximal end 16 relative to a longitudinal axis LA extending relative to the body 10. The handle coupler 12 enables the handle 80 to be arranged in a first position and a second position relative to the longitudinal axis LA. In the first position, the handle 80 is arranged relative to the coupler 12 such that the handle 80 is offset relative to the longitudinal axis LA. In the second position, the handle 80 is arranged relative to the handle coupler 12 such that the handle 80 is parallel to the longitudinal axis LA.

[0059] refer to Figure 2 , the handle 80 has a grip portion 82 that spaces a front end 84 from a rear end 86 relative to the handle axis HA.

[0060] The handle 80 is removable from the instrument 1. The handle 80 has a first coupling member 88 of the handle coupler 12. The first coupling member 88 enables the handle to be removably coupled to the instrument 1 via the handle coupler.

[0061] The first coupling member 88 is located near the front end 84. The first coupling member 88 has a first elastic element 90A and a second elastic element 90B. The elastic elements 90A, 90B each have a protrusion 92A, 92B.

[0062] refer to Figure 3 , the handle coupler 12 includes a first coupling member 88 and a second coupling member 20. The first coupling member 88 is shaped and sized to be received by the second coupling member 20.

[0063] The second coupling member 20 is part of the body 10. The second coupling member 20 is located near the proximal end 16. The second coupling member 20 has a cylindrical body that extends from the main portion 10A of the body 10 in a region adjacent the proximal end 16 at an angle.

[0064] The second coupling member 16 extends from the body along a coupling axis CA. The coupling axis CA is offset relative to the longitudinal axis LA. The coupling axis is offset at an angle of 45 degrees relative to the longitudinal axis. Of course, as will be appreciated by those skilled in the art, other offset angles are possible.

[0065] The second coupling member 20 has a cavity 22 in its body that is shaped and sized to receive the first coupling member 88. The cavity 22 is defined by an opening 22A and a sidewall 22B. The opening 22A is located at one end of the second coupling member 20. The inner sidewall 22B defining the cavity 22 extends along the coupling axis CA.

[0066] A press fit is formed between the first coupling member 88 and the second coupling member 20 to couple them together.

[0067] refer to Figure 2 and Figure 3 The second coupling member includes a first hole 24A and a second hole 24B. The holes 24A and 24B are arranged to receive the protrusions 92A and 92B. The first hole 24A is arranged to receive the first protrusion 92A. The second hole 24B is arranged to receive the second protrusion 92B. When the first coupling member 88 is coupled to the second coupling member 20, the protrusions 92A and 92B are located in the holes 24A and 24B to releasably lock the handle 80 to the body 10.

[0068] The handle coupler 12 includes a release mechanism 30. The release mechanism 30 is arranged to engage with the front end 84 to pry the protrusions 92A, 92B out of the holes 24A, 24B. Removing the protrusions 92A, 92B from the holes 24A, 24B releases the lock and enables the handle 80 to be removed from the body 10.

[0069] like Figure 4 and Figure 5 As shown, the removable handle 80 enables the instrument 1 to be configured into at least a first configuration and a second configuration. Figure 4 In the first configuration shown, the handle 80 is configured so that the instrument 1 can be used as a reamer. Figure 5 In the second configuration shown, the handle 80 is configured so that the instrument 1 can be used as an impactor.

[0070] The adjustable handle 80 can be arranged relative to the body 10. In a first configuration, the handle is arranged such that the handle axis HA is offset from the longitudinal axis LA. Figure 4 As shown, the handle is offset such that the handle axis HA is substantially perpendicular to the longitudinal axis LA. In a second configuration, the handle 80 is arranged such that the handle axis HA is aligned parallel relative to the longitudinal axis.

[0071] refer to Figure 6, the first coupling member 88 is a portion of the handle 80 that extends from the grip portion 82 to the front end 84 of the handle 80. The first coupling member 88 extends away from the grip portion 82 at an angle offset relative to the handle axis HA. The first coupling member 88 extends away from the grip portion 82 at an angle of 45 degrees relative to the handle axis HA of 45 degrees. Of course, as will be appreciated by those skilled in the art, other offset angles are certainly possible.

[0072] The first coupling member 88 has a sidewall 94 that extends like a neck from a shoulder 96 at the transition point between the first coupling member 88 and the gripping portion 82. The resilient elements 90A, 90B are located in the sidewall 94. The resilient elements 90A, 90B are defined by a gap in the sidewall 94 that extends from the midpoint of the sidewall 94 to the front end 84.

[0073] The sidewall 94 surrounds a groove 98. The groove 98 is configured to allow the first coupling member 88, including the resilient elements 90A, 90B, to flex when it is pressed into the second coupling member 20. For example, when the first coupling member 88 engages the second coupling member 20, the resilient elements 90 deflect inwardly. Once the first coupling member 88 is properly positioned, the protrusion 92 snaps into the aperture 22. The positioning of the protrusion 92 in the aperture 22 locks the handle 80 to the body 10.

[0074] The sidewall 94 defines a curved rectangular outer profile of the first coupling member 88. The curved rectangular outer profile has a first flat surface and a second flat surface on opposite sides connected by opposite curved sides. Of course, as will be understood by those skilled in the art, the sidewall 94 can define an outer profile of any suitable shape for the first coupling member.

[0075] The inner sidewall 22B of the cavity 22 forming the second coupling member 20 has a shape that matches the shape of the outer sidewall 94 of the second coupling member 88. In this way, when the coupling members 88, 20 are engaged, they form a press fit.

[0076] refer to Figure 7 The instrument 1 includes a driver 50. Driver 50 includes a first connector 52 coupled to a second connector 54 via a drive shaft 56. When driver 50 is assembled into the instrument, first connector 52 is positioned adjacent to distal end 14. First connector 20 is adapted to be connected to a driven instrument, such as a reamer drill head or an acetabular cup prosthesis. Second connector 54 is positioned adjacent to proximal end 16. Second connector 54 is adapted to be connected to a driving instrument, such as a power tool.

[0077] The body 10 has a first portion 10A and a second portion 10B. The first portion 10A includes a passage 26 extending from the distal end 14 to the proximal end 16. The second portion 10B is connected to the first portion 10B and covers the passage 26.

[0078] The drive shaft 56 is disposed in the channel 26. The drive shaft 56 is coupled to the first connector 52 and the second connector 54. The drive shaft 56 transfers torque applied to the second connector 54 to the first connector 52 to rotate the first connector 52 about the longitudinal axis LA.

[0079] The first connector 52 is a reamer coupler. The first connector 52 is capable of coupling the reamer head to the instrument 1, such as Figure 4 An exemplary reamer head RH is shown in . With the reamer head H coupled to the instrument 1 , the instrument 1 may be used to perform a reaming procedure.

[0080] Continue to refer Figure 7 , the instrument 1 includes an adapter 75. The adapter 75 can be coupled to the first connector 52 to adapt the instrument 1 to be coupled to an acetabular cup trial or an acetabular cup prosthesis, such as Figure 5 The adapter has a first portion 76 configured to couple to the first connector 52 and a second portion 78 configured to couple to the acetabular trial or acetabular cup prosthesis P. With the trial or prosthesis P coupled to the instrument 1, the instrument 1 can be used to perform an impaction procedure.

[0081] The second region 78 is cylindrical in shape and has threads for coupling the adapter 100 to the acetabular cup prosthesis.

[0082] Figure 2 An adapter 75 is shown disposed on the first connector 52. With the adapter 75 in place, the first connector 52 is configured to receive the acetabular cup prosthesis P.

[0083] Reference again Figure 7 , the first connector 52 is a body that defines a first portion 58 adapted to be coupled to the drive shaft 56 and a second portion 60 adapted to receive and be coupled to the reamer head RH.

[0084] The first connector 52 houses a set of spring-loaded jaws 62A, 62B. These spring-loaded jaws 62A, 62B are resiliently retained within the first connector 52. Each jaw 62A, 62B includes a button 64 and teeth 66. The button 64 is disposed within the first portion 58, and the teeth 66 are disposed within the second portion 60. The teeth 66 are biased to resiliently engage the coupling portion of the reamer head RH or the coupling portion 76 of the adapter 75. Pressing the button 64 releases the teeth from the coupling portion, thereby enabling the reamer head RH or the adapter 75 to be removed from the first connector 52.

[0085] The exemplary coupling provided by the set of spring jaws 62A, 62B may of course be varied, and other mechanisms for retaining the reamer head RH or adapter 75 are of course possible and within the scope of the present invention.

[0086] The transition between the first portion 58 and the second portion 60 defines an abutment surface 68. The abutment surface 68 extends around the perimeter defining the second portion 60. The abutment surface 68 is arranged to abut a flat or planar base RB of the reamer head RH, such as Figure 8 In use, the abutment surface 68 abuts the reamer head RH to minimize movement of the reamer head RH relative to the first connector 52. Limiting movement of the reamer head RH relative to the instrument 1 helps ensure that the instrument 1 reams a cavity in the bone that is the size desired by the operator of the instrument 1.

[0087] Second portion 60 is defined by a faceted surface 70. Faceted surface 70 matches the shape of the opening of connector RC that forms reamer head RH. Connector RC is substantially square, with cut corners that give it an overall octagonal shape. Faceted surface 70 is correspondingly roughly square. Similarly, the shape of connector RC is cut with corners that give it an overall octagonal shape. The mating of faceted surface 36 with connector RC provides a secure fit between first connector 52 and reamer head RH. This mating secures reamer head RH to first connector 52 and enables torque applied to instrument 1 to be transmitted to reamer head RH.

[0088] The second connector 54 has a power tool coupler 72. The power tool coupler 70 is a conventional coupler. For example, the coupler 70 may be a so-called Hudson coupler. Other couplers are of course possible, such as those shown and described in co-pending U.S. Patent Application No. 62 / 548,490 and U.S. Patent Application No. 62 / 592,478, which are incorporated herein by reference in their entirety.

[0089] The instrument 1 includes a dial 40, which is an annular component connected to a second connector 54 adjacent the body 10. The dial 40 is manually operated to rotate a drive shaft 56. The dial 56 has a plurality of grooves 42 positioned around its periphery for increasing friction between the operator's fingers and the dial 40.

[0090] In use, the operator uses the dial 40 to rotate the first connector 52. When the adapter 75 is coupled to the first connector 52, the dial 40 can be rotated. The second portion 78 of the adapter 75 has threads. The second portion 78 can engage with a threaded hole in an exemplary acetabular trial or prosthesis P. Rotation of the dial 40 can help couple the threads of the second portion 78 with a threaded hole (not shown) in the exemplary acetabular trial or prosthesis P. The resulting coupling is shown in FIG. Figure 5 As shown, the figure shows the instrument in a second configuration.

[0091] The manner in which the apparatus 1 is operated will now be described.

[0092] The operator selects between positions depending on the type of treatment the instrument 1 will be used to perform. Figure 4 The instrument 1 is shown with the handle in a first position. Figure 5 The instrument 1 is shown with the handle in a second position.

[0093] Figure 4 The instrument 1 is shown arranged in a first reaming configuration. In the reaming configuration, the instrument 1 is arranged for use as a reamer. The reamer head H may be coupled to a first connector 52 and the power tool P may be coupled to a second connector 54.

[0094] To set up the instrument 1 for use as a reamer, if the handle 80 is not already coupled to the instrument 1, it is simply engaged with the handle coupler 12 in the first position. If the handle is arranged in the second position, the release lever 30 is depressed to release the handle 80. The handle 80 is removed from the handle coupler 12, arranged so that the handle axis HA is perpendicular to the longitudinal axis LA, and reengaged with the handle coupler 12.

[0095] When the handle is in the first position, the instrument is configured for an impact procedure.

[0096] In the reaming configuration, the handle 80 is arranged in a first position. In the first position, the handle axis HA is offset relative to the longitudinal axis LA. Figure 4 As shown, the handle may be offset 90° and perpendicular relative to the longitudinal axis LA.

[0097] exist Figure 4 In the arrangement shown, the instrument 1 is configured for use in a reaming procedure.

[0098] During reaming, the operator grasps the handle 80 and uses the instrument 1 to press the reamer head RH against the bone, such as the acetabular cup, by manipulating the power tool P. During reaming, the reamer head RH is used to ream a hemispherical cavity in the bone.

[0099] During the reaming process, the operator may use a number of different sized reamer heads RH. Figure 8 An exemplary reamer head of size "63" is shown. Reamer heads RH of varying sizes are used to progressively ream a cavity by gradually increasing the diameter of the cavity until a cavity of the appropriate size is formed.

[0100] To connect the reamer head RH to the instrument 1, the reamer head RH is pressed onto the first connector 52 to engage the teeth 66 of each jaw member 62A, 62B. To remove the in-situ reamer head RH, the button 64 is actuated to remove the teeth 66 from the in-situ reamer head RH. The in-situ reamer head can be removed by the operator or someone assisting the operator.

[0101] refer to Figure 5 , the instrument 1 is arranged in a second configuration. In the second configuration, the handle 80 is arranged in the second position and the adapter 75 is coupled to the first connector.

[0102] When the handle 80 is in the second position and the adapter 75 is connected to the first connector 52, the instrument 1 is arranged in the impact configuration.

[0103] In the impaction configuration, the acetabular cup trial or prosthesis P may be coupled to the instrument 1 and impacted into the cavity formed in the bone during the reaming process.

[0104] To set up the instrument 1 for a percussion procedure, the handle 80 is positioned in the second position. If the handle 80 is not already coupled to the instrument 1, it is simply engaged with the handle coupler 12 in the second position. If the handle is in the first position, the release lever 30 is depressed to release the handle 80. The handle 80 is removed from the handle coupler 12, positioned so that the handle axis HA is parallel to the longitudinal axis LA, and reengaged with the handle coupler 12. In this arrangement, the handle is in the second position and is set up for use in a percussion procedure.

[0105] To couple the acetabular cup trial or prosthesis P, the operator selects the appropriate acetabular cup trial or prosthesis P. The operator positions the acetabular cup trial or prosthesis P and rotates the dial 40. The threaded second portion 78 engages the threaded hole in the acetabular cup trial or prosthesis P to couple the instrument 1 to the acetabular cup trial or prosthesis P.

[0106] With the acetabular cup trial or prosthesis P already attached, the instrument 1 is configured for use during a percussion procedure.

[0107] With the instrument 1 in the impact configuration and the acetabular cup trial or prosthesis P coupled to the distal end 16, the operator grasps the handle 80 with one hand and positions the instrument 1 relative to the bone in which the cavity has been formed during the reaming process.

[0108] With the handle 80 in the second position, the strike plate 100 is arranged in a position suitable for being struck by a surgical mallet or other suitable device M. In the arrangement shown, the strike plate 100 is arranged perpendicularly relative to the longitudinal axis LA.

[0109] The operator holds the instrument 1 in the desired position and orientation with one hand and uses the other hand to strike the impact plate 100 with a surgical mallet M. The striking process is repeated until the operator is satisfied that the acetabular cup trial or prosthesis P is properly seated.

[0110] The operator may then actuate the dial 40 to disengage the instrument 1 from the acetabular cup trial or prosthesis P and remove the instrument 1 , leaving the trial or prosthesis P in place.

[0111] To manufacture the instrument 1, the body 10, removable handle 80, dial 40 and jaw members 62A, 62B are manufactured by injection molding. These components 10, 80, 40, 62A and 62B are made of plastic materials. Suitable plastic materials include polyacrylamide and MED polyamide 12 (also known as nylon 12).

[0112] The first connector 52, the second connector 54, the drive shaft 56, and the adapter 75 are manufactured using injection molding. These components 52, 54, 56, and 75 are made of metal. A suitable metal material is stainless steel. For example, 17-4PH stainless steel can be used.

[0113] Of course, the device 1 may be manufactured using other manufacturing techniques and from other materials as will be appreciated by one of ordinary skill.

[0114] These components are assembled together in conventional manner to form the device 1 .

[0115] Figures 9 to 13 The apparatus 2 of the second embodiment of the present invention is shown. The apparatus 2 is substantially identical to the apparatus 1 except for the handle coupling, handle and scale. In the second embodiment, the apparatus 2 has a handle coupling 212, a handle 280 and a scale 240.

[0116] For simplicity, only the parts that are different between the apparatus 1 and the apparatus 2 will be described. All other parts not described are the same as those of the apparatus 1.

[0117] refer to Figure 9 The handle 280 forms a part of the main body 210. The handle has a fixed portion 280A and a movable portion 280B. The movable portion 280B is rotatably coupled to the fixed portion 280A via a handle coupler 212.

[0118] The handle coupler 212 is configured to enable the instrument 2 to be Figure 12 and Figure 13 Convert between the reaming and impact configurations shown.

[0119] like Figure 12 and 13As can be seen, the fixing portion 280A is part of the body 210 of the instrument 2. The fixing portion 280A is aligned with the longitudinal axis LA of the body 210. The fixing portion 280A defines a gripping portion 282.

[0120] Reference again Figure 9 The movable portion 280B of the handle 280 has a front end 284 which is separated from a rear end 286 along the handle axis HA by a housing 283. The housing 283 is used to move the instrument 2 when it is in a position such as Figure 9 and Figure 13 The shock configuration shown accommodates Figure 11 The second connector 254 of the driver 250 of the instrument 2 is shown.

[0121] Reference again Figure 9 , the movable portion 280B has a window 285 in the housing 283, through which the second connector 254 passes when the movable portion 280B transitions between the reaming configuration and the impact configuration.

[0122] The front end 284 is rotatably coupled to the fixed portion 280A via the handle coupler 212. The handle coupler 212 is a swivel joint 396.

[0123] The handle coupler 212 has a locking device 230. Similar to the release lever 30, the locking device 230 locks the adjustable portion of the handle 280 (e.g., the movable portion 280B) in one of the first and second positions, and the release switch 231 releases the lock to allow the adjustable portion to be rearranged.

[0124] In the first handle position, as Figure 12 As shown, the movable portion 280B is arranged such that the handle axis HA is offset relative to the longitudinal axis LA of the instrument 2. With the handle in the first position, the second connector 254 is disposed through the window 285 and is accessible to the power tool P for engagement.

[0125] In the second handle position, as Figure 13 As shown, the movable portion 280B is arranged so that the handle axis HA is aligned with the longitudinal axis LA. When the handle 280 is in the second position, the second connector 254 is located in the housing 385.

[0126] Return Reference Figure 9 In the instrument 2 , a scale 240 similar to the scale 40 of the reamer 1 is located in the rear end 286 of the handle 280 .

[0127] The dial 240 has a knob 241 that defines an impact plate 300 of the handle 280. The dial 240 can be rotated about the handle axis HA by manipulating the knob 241. Rotation of the knob 241 causes the dial 240 to rotate so that the acetabular cup trial or prosthesis P can be coupled to the instrument 2.

[0128] refer to Figure 11 , the dial 240 has a protrusion 243. The protrusion 243 has a beveled end 245. The protrusion 243 is located in the housing 283. The protrusion 243 extends from the knob 241 relative to the handle axis HA.

[0129] In such Figure 13 In the illustrated impact configuration, the beveled end 245 engages the beveled portion 255 of the second connector 254 .

[0130] refer to Figure 10 , the dial 240 has a knob 241 (for simplicity in Figure 10 241 is coupled to the sun gear arrangement of the protrusion 243 and the ramp portion 255. Due to the sun gear arrangement, the torque applied by the operator to the knob 241 is transmitted to the second connector 254. For example, the transmission of torque enables the acetabular cup prosthesis P to be coupled to the instrument 2.

[0131] Similar to the use of instrument 1, instrument 2 is arranged in a reaming configuration and a percussion configuration and can be used as a reamer or a percussion tool. Figure 11 and Figure 12 The instrument 2 is arranged in one configuration by orienting the handle 280 in one of the first and second positions.

[0132] The use of the device 2 is the same as described for the device 1 .

[0133] To manufacture the instrument 2, the body 210, the fixed portion 280A of the handle and the jaw members 262A, 262B are manufactured by injection molding. These components 210, 280A, 262A and 262B are made of plastic materials. Suitable plastic materials include polyacrylamide and MED polyamide 12 (also known as nylon 12).

[0134] The dial 240, first connector 252, second connector 254, drive shaft 256, adapter 275, and movable handle portion 280B are manufactured using injection molding. These components 240, 252, 254, 256, 275, and 280B are made of metal. A suitable metal material is stainless steel. For example, 17-4PH stainless steel can be used.

[0135] Of course, the device 1 may be manufactured using other manufacturing techniques and from other materials as will be appreciated by one of ordinary skill.

[0136] Figure 14 and Figure 15 A third embodiment of the invention is shown as an instrument 3. Instrument 3 is substantially identical to instrument 2 except for the handle coupling and handle.

[0137] For simplicity, only the parts that differ between apparatus 2 and apparatus 3 will now be described. All other parts not described are the same as those described for apparatuses 1 and 2.

[0138] Similarly to instrument 2, adjustable handle 380 of instrument 3 is coupled to a portion of body 310. In contrast, handle 380 is pivotable relative to body 310, with movable portion 280B of handle 280 being rotatable between a first position and a second position.

[0139] The handle coupler 312 enables the handle 380 to be arranged between a first position and a second position to configure the instrument 3 for use as a reamer or an impactor.

[0140] The handle coupler 312 includes a pivot pin 313. The pivot pin 313 pivotally couples the handle 380 to the body 310.

[0141] The handle can be placed on Figure 13 The first position shown and Figure 14 When the handle is in the first position, the instrument 1 can be used for reaming. When the handle is in the second position, the instrument 1 can be used for impaction.

[0142] In the first position, the handle 380 is movable about the pivot pin 313 .

[0143] In the second position, the handle is locked to the body 310 by the coupling members 320, 388 of the handle coupler 312. The first coupling member 388 is located on the handle 380 and the second coupling member 320 is provided by the body 320. The first coupling member 388 snap fits onto the second coupling member 320 to lock the handle 380 in position relative to the body 310.

[0144] The first coupling member 388 is defined by a resilient jaw 390 in the handle 380. The jaw 390 has a cylindrical inner cavity 398 and a mouth 395 that opens into the cavity 398.

[0145] The second coupling member 320 is a portion of the body 310. This portion of the body 310 has a cylindrical outer profile, the diameter of which matches the cylindrical inner profile defining the cavity 398.

[0146] Due to the elasticity of the jaws 390 when the first coupling member 388 is pivotally engaged with the second coupling member 320, the mouth 395 widens. The widening of the mouth continues until the jaws elastically snap onto the second coupling member 320.

[0147] The dial 340 of instrument 3 is positioned adjacent to the second connector 354 of driver 350. Similar to instruments 1 and 2, the dial 340 is used to rotate the first connector when the acetabular trial or prosthesis is coupled to instrument 3. Instrument 3 has a stop 397. The stop 485A is arranged to engage the groove 474 of the dial 472 to prevent the dial 472 from rotating when the instrument 3 is arranged to be used as an impactor.

[0148] Similar to the use of instruments 1 and 2, instrument 3 is arranged in a reaming configuration and a percussion configuration and can be used as a reamer or a percussion drill. Figure 13 and Figure 14 The instrument 3 is arranged in one configuration by orienting the handle 380 in one of the first and second positions in the one position shown.

[0149] Instrument 3 is used for the reaming procedure as described for instrument 1. Instrument 3 is used for the impaction procedure substantially as described for instrument 1, except that the acetabular cup trial or prosthesis P is coupled to the first connector. With the stop 385A preventing the dial 340 from rotating in the second position, the adapter 75 is connected and the acetabular cup trial or prosthesis P is coupled to the first connector while the handle 380 remains in the first position.

[0150] Exemplary embodiments 1, 2, and 3 of the housing instrument of the present invention can be arranged between multiple configurations. In a first configuration, the instrument can be used as a reamer. In a second configuration, the instrument can be used as an impactor. Due to the manner in which the instrument can be switched between configurations, the instrument is convenient and effective in reducing the overall size of the instrument kit used during surgery and in reducing surgical efficiency, as the instrument is easier to use than prior art techniques that require the removal of multiple components during reconfiguration.

[0151] Attention is directed to all documents and publications which are filed concurrently with or prior to the specification incorporating this application and which are open to the public with this specification, and the contents of all such documents and publications are incorporated herein by reference.

[0152] All features disclosed in this specification (including any accompanying claims, abstract and drawings), and / or all steps of any method or process so disclosed, may be combined in any combination, except where at least some of such combinations of features and / or steps are mutually exclusive.

[0153] Unless expressly stated otherwise, each feature disclosed in this specification (including any accompanying claims, abstract, and drawings) may be replaced by alternative features serving the same, equivalent, or similar purpose. Therefore, unless expressly stated otherwise, each feature disclosed is only one example of a generic series of equivalent or similar features.

[0154] The invention is not limited to the details of the foregoing embodiments. The invention extends to any novel one or any novel combination of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or any novel one or any novel combination of the steps of any disclosed method or process.

[0155] While preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that changes may be made without departing from the scope of the invention as defined in the claims.

[0156] In this specification, the terms "comprise," "comprises," "comprising," or similar terms are intended to represent non-exclusive inclusion, such that a system, method, or apparatus that includes a list of elements does not include only those elements but is likely to include other elements that are not listed.

[0157] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that the prior art forms part of the common general knowledge.

[0158] It should of course be understood that this description is by way of example only; changes and modifications may be made to the described embodiments without departing from the scope of the present invention as defined in the claims.

Claims

1. An apparatus comprising a body including a distal end spaced from a proximal end relative to the longitudinal axis and a handle coupler positioned adjacent the proximal end, the body defining a passage extending between the distal end and the proximal end; a driver comprising a first connector positioned adjacent the distal end and adapted to connect to a driven instrument, a second connector positioned adjacent the proximal end and adapted to connect to a driving instrument, and a drive shaft disposed in the channel, the drive shaft coupling the second connector to the first connector; as well as an adjustable handle located near the distal end, the adjustable handle including a grip portion spaced along a handle axis between a forward end coupling the handle to the handle coupler and a rearward end shaped to define a strike plate; wherein the adjustable handle is capable of being arranged relative to the body in a first position and a second position, wherein in the first position, the front end is arranged relative to the handle connector so that the handle axis is offset relative to the longitudinal axis, and in the second position, the front end is arranged relative to the handle connector so that the handle axis is parallel to the longitudinal axis.

2. The apparatus according to claim 1, wherein In the second position, the strike plate is perpendicular to the longitudinal axis.

3. The apparatus according to claim 1, wherein In the first position, the second connector is engageable by the driving instrument and the adjustable handle is graspable by a user to provide additional support.

4. The apparatus of any one of claims 1 to 3, wherein the adjustable handle is rotatably coupled to the handle coupler distal end of the body.

5. The instrument of any one of claims 1 to 3, wherein the adjustable handle is coupled to the handle coupler by a joint, the joint being configured to enable the adjustable handle to rotate between the first position and the second position.

6. The instrument of any one of claims 1 to 3, wherein the adjustable handle is removable from the handle coupler such that the adjustable handle is positionable in one of the first position or the second position.

7. The apparatus of claim 6, wherein the handle coupler includes a faceted recess and the front end of the adjustable handle is faceted; and The front end of the adjustable handle is removable from the faceted recess and, due to the facets, can be selectively placed into the faceted recess in the first position or the second position.

8. The apparatus according to claim 7, wherein In cross-section, the facet groove and the facet front end have the same polygonal shape.

9. The apparatus of any one of claims 1 to 3, further comprising a retaining mechanism for retaining the handle in the first position and the second position.

10. The apparatus of claim 9, wherein the retaining mechanism comprises a latch that holds the handle in one of the first position or the second position and a release mechanism that unlocks the latch so that the handle can move between the first position and the second position.

11. A method for preparing a device, comprising the steps of: An apparatus is provided, comprising: a body including a distal end spaced from a proximal end relative to the longitudinal axis and a handle coupler located adjacent the proximal end, the body defining a passage extending between the distal end and the proximal end, a driver comprising a first connector positioned adjacent the distal end and adapted to connect to a driven instrument, a second connector positioned adjacent the proximal end and adapted to connect to a driving instrument, and a drive shaft disposed in the channel, the drive shaft coupling the second connector to the first connector, and an adjustable handle located near the distal end, the adjustable handle including a grip portion spaced along a handle axis between a forward end coupling the handle to the handle coupler and a rearward end shaped to define a strike plate; and placing the adjustable handle in one of a first position or a second position; wherein in the first position, the adjustable handle is arranged such that the front end is arranged relative to the handle coupler such that the handle axis is offset relative to the longitudinal axis; and Wherein in the second position, the adjustable handle is arranged such that the front end is arranged relative to the handle coupler such that the handle axis is parallel to the longitudinal axis.

12. The method according to claim 11, wherein In the second position, the strike plate is perpendicular to the longitudinal axis.

13. The method according to claim 11, wherein In the first position, an operator engages the second connector with a driving instrument, and the adjustable handle is grasped by the operator.

14. The method of any one of claims 11 to 13, wherein the adjustable handle is rotatably coupled to the handle coupler distal end of the body.

15. The method of any one of claims 11 to 13, wherein the adjustable handle is coupled to the handle coupler by a joint, the joint being configured to enable the adjustable handle to rotate between the first position and the second position.

16. The method of any one of claims 11 to 13, wherein the adjustable handle is removable from the handle coupler such that the adjustable handle is positionable in one of the first position or the second position.

17. The method of claim 16, wherein the handle coupler includes a faceted groove and the front end of the adjustable handle is faceted; and The front end of the adjustable handle is removable from the faceted recess and, due to the facets, can be selectively placed into the faceted recess in the first position or the second position.

18. The method according to claim 17, wherein In cross-section, the facet groove and the facet front end have the same polygonal shape.

19. The method of any one of claims 11 to 13, wherein the instrument further comprises a retaining mechanism that retains the handle in the first position and the second position.

20. The method of claim 19, wherein the retaining mechanism comprises a latch that retains the handle in one of the first position or the second position; and Wherein the method includes the step of depressing the latch to unlock a release mechanism, enabling the handle to move between the first position and the second position.

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