Acetabular reaming drill handle and method for reaming an acetabulum

Abstract

The present invention discloses an acetabular reamer handle and a method for reaming an acetabulum. The handle includes a hollow shaft having a plurality of shaft sections, the plurality of shaft sections including a distal shaft section having a distal end and a proximal end and an additional shaft section having a distal end, the distal end of the additional shaft section being pivotally attached to the proximal end of the distal shaft section to allow the additional shaft section and the distal shaft section to be adjustably oriented at an angle. The handle also includes a hollow neck component having a longitudinal axis. The handle also includes a transmission system having a head component mounted to rotate around the longitudinal axis and capable of being connected to a reamer. The distal end of the distal shaft section is pivotally attached to the proximal end of the neck component to allow the distal shaft section and the neck component to be adjustably oriented at an angle.

Description

Technical Field

[0001] The present invention relates to an acetabular reaming drill handle and a method for reaming an acetabulum in hip replacement surgery. Background Art

[0002] Hip replacement is a surgical procedure in which the hip joint is replaced by a prosthetic implant. As part of a hip replacement procedure, the patient's acetabulum can be prepared to receive an acetabular cup implant by reaming the acetabulum to an appropriate size and depth. The present invention discloses a surgical tool for reaming the acetabulum, which may include a reamer having a substantially hemispherical dome to be received in the acetabulum. The reamer may also include a feature located on the outer surface of the dome, which is used to file the inner surface of the acetabulum when the reamer rotates. The reamer may be attached to the distal end of a tubular reamer handle to allow a surgeon to manipulate the reamer (e.g., positioning the dome in the acetabulum and applying a force for pressing the reamer against the inner surface of the acetabulum when the reamer rotates). A drive train may extend within the reamer handle for transmitting torque to the reamer.

[0003] Various types of reamer shanks may be used.

[0004] One type of reamer handle is an offset reamer handle. This type of reamer handle may include a pair of bends in the tube that form a dog-leg configuration, which may allow a surgeon to work more easily around soft tissue.

[0005] Another type of reamer shank may include a single bend.

[0006] Another type of reamer shank may be substantially straight (ie, not including a bend).

[0007] WO2003 / 065906 describes a surgical device for holding and rotating an acetabular reaming head. The device comprises a shaft having a length extending from a first end to a second end, the first end being adapted to hold an acetabular reaming head. At least a portion of the shaft deviates from an axis defined by the first and second ends of the shaft, for example, the shaft may comprise a C-shaped deviating portion. Thus, the head held by the device may enter the acetabulum in the true anatomical position of the acetabulum while avoiding the shaft from intruding into surrounding body parts.

[0008] Depending on the approach being followed and / or based on the surgeon's personal preference, the surgeon may prefer to use one or more of the above-described types of reamer handles in a hip replacement surgery. To accommodate this, a surgical kit may typically include one reamer handle of each type of reamer handle. In any given surgery, one or more of the reamer handles in the kit may not be used, in which case the cost and weight of the surgical kit has been unnecessarily increased. Even if more than one type of reamer handle is used during surgery, switching between the reamer handles may be inconvenient and time consuming.

[0009] US 8,052,690 describes an orthopedic reamer driver comprising a tubular housing having at least one first locating feature. A drive shaft within the housing has a drive end. A variable angle cap is pivotally coupled to the housing adjacent the drive end. The variable angle cap comprises at least one leg extending along a side of the housing. Each leg has a second locating feature that selectively engages and disengages with a corresponding first locating feature at an angular position selected from a plurality of angular positions. Each second locating feature holds the variable angle cap at the selected angular position when engaged with the corresponding first locating feature. A variable angle joint is coupled to the drive end, and a reamer drive head is coupled to the variable angle joint.

[0010] US 7,008,430 describes a positioning tool for a joint socket cutting instrument or implant, which is designed to be used with minimally invasive surgery and used in combination with computer-assisted surgery. The positioning tool has a longitudinally extending drive shaft, which has a movable joint at a first end and a drive coupling for connecting to a power source at a second end. A retainer for mounting a cutting tool such as a drill or an acetabular cutting instrument or for mounting an acetabular implant is connected to a movable joint at the first end of the drive shaft to move relative to the drive shaft. When the drive shaft rotates, the retainer can rotate around its central axis. The drive shaft includes a bearing mounted thereon, which is pivotally connected to the shaft at a fixed longitudinal position and pivotally connected to a longitudinally extending first arm, which has a handle. A tracker system that can be utilized by a computer-assisted surgical system is mounted on the first arm. A second arm is provided, which is pivotally connected to the retainer at the first end and pivotally connected to the first arm at the second end. The resulting four-bar linkage allows manipulation of the holder and cutting instrument / implant in any position, while the known geometric relationship between the tracker and the holder allows the computer to display the position of the holder relative to the joint on a cathode ray tube.

[0011] WO 2018 / 033788 A1 describes a surgical reamer driver device that provides a fully closed tube that prevents the intrusion of debris and minimizes the wear of soft tissue during use. The reamer device includes a minimum number of component assemblies to allow easy replacement and minimize wear. The surgical reamer driver has: a housing assembly located in a self-contained assembly unit; a transmission drive mechanism located in the self-contained assembly unit, the transmission drive mechanism is enclosed in the housing assembly and has at least one double universal joint and a surgical tool connector at its distal end; a motor coupling located in the self-contained assembly unit, the motor coupling is at the proximal end of the surgical reamer driver; and a handle assembly located in the self-contained assembly unit, the handle assembly is at the proximal end of the surgical reamer driver; these four basic components form a driver that effectively prevents debris from entering when the driver is working internally in a fully assembled state. A method for disassembling a reamer driver, the method comprising the following steps: A. actuating a sliding release sleeve to unlock a handle assembly from a housing assembly, thereby allowing a drive mechanism to be unsealed within the housing assembly; b. sliding the handle assembly away from the housing, thereby effectively unsealing the drive mechanism; c. pulling a motor coupling out of the housing, thereby freeing the drive mechanism from axial constraints on one end; d. disengaging the drive mechanism on that end and lifting that end out of the housing assembly, thereby allowing the drive mechanism to be removed; and e. pulling the drive mechanism out of the housing assembly, thereby removing the drive mechanism from the housing assembly.

[0012] US 2004 / 097947 A1 describes an orthopedic reamer assembly for minimally invasive surgery, comprising a reamer and a driver. The driver comprises: a shaft having a distal end and a longitudinal axis; and a driver head connected to the distal end. The driver head is capable of pivoting about an axis substantially perpendicular to the longitudinal axis. The reamer is connected to the driver head.

[0013] EP 2 954 860 A2 describes an orthopedic reamer handle, which includes: a reamer portion, which is configured to transmit torque to the reamer head; a driver portion, which is connected to the reamer portion and is configured to receive and transmit torque from the driver; and a drive mechanism, which connects the reamer portion and the driver portion and is configured to transmit torque from the driver portion to the reamer portion, the drive mechanism including: a first drive shaft having a first end and a second end, the first end being connected to the driver portion, the first drive shaft defining a first axis; a first intermediate connector, the first intermediate connector having a first intermediate end and a second intermediate end, the first intermediate end being connected to the second end; a biasing member, the biasing member having a third end and a fourth end, the third end being connected to the second intermediate end at an acute angle relative to the first axis, the biasing member defining a second axis; and a second intermediate connector, the second intermediate connector connecting the fourth end to the reamer portion at an acute angle relative to the second axis. Summary of the invention

[0014] Aspects of the invention are presented in conjunction with the independent and dependent claims. Combinations of features from the dependent claims may be combined with features of the independent claims as appropriate and not just as explicitly presented in the claims.

[0015] According to an aspect of the present invention, there is provided an acetabular reamer shank, the acetabular reamer shank comprising:

[0016] A hollow shaft having a plurality of shaft sections, the plurality of shaft sections comprising:

[0017] a distal shaft segment having a distal end and a proximal end; and

[0018] an additional shaft segment having a distal end pivotally attached to the proximal end of the distal shaft segment to allow the additional shaft segment and the distal shaft segment to be adjustably oriented at an angle relative to each other;

[0019] a hollow neck member having a longitudinal axis;

[0020] a drive train extending through the shaft and the neck component, wherein a head component of the drive train is mounted for rotation about a longitudinal axis of the neck component and is connectable to the acetabular reamer,

[0021] Wherein the distal end of the distal shaft section is pivotally attached to the proximal end of the neck component to allow the distal shaft section and the neck component to be adjustably oriented at an angle relative to each other.

[0022] Providing the plurality of shaft sections and neck components pivotally attached together to be oriented at an angle relative to each other allows the acetabular reamer handle to adopt a variety of different configurations. For example, by properly angling the neck component, the distal shaft section, and the additional shaft section, the acetabular reamer handle can be operated as an offset reamer handle, as a reamer handle including a single bend, and / or as a substantially straight reamer handle without a bend. This can allow the use of a single tool to provide the functionality of different types of acetabular reamer handles. This can reduce the cost, weight, and cleaning time of a surgical kit that includes an acetabular reamer handle. In addition, the configuration of the acetabular reamer handle can be conveniently changed during surgery, which can avoid the need to switch between different types of acetabular reamer handles.

[0023] The acetabular reamer handle may include a distally facing engagement surface at the distal end of the distal shaft segment and a plurality of engagement surfaces at the proximal end of the neck component. The neck component may be capable of pivoting relative to the distal shaft segment to present each of the plurality of engagement surfaces to the distally facing engagement surface at the distal end of the distal shaft segment, thereby orienting the neck component and the distal shaft segment at a corresponding angle relative to each other. Providing the plurality of engagement surfaces at the proximal end of the neck component may allow the surgeon to conveniently select a predetermined angle (e.g., 0°, +30°, -30°, +45°, -45°, +60°, -60°, etc.) of the neck component relative to the distal shaft segment by selectively engaging one of the plurality of engagement surfaces with the distally facing engagement surface at the distal end of the distal shaft segment.

[0024] The distally facing engagement surface of the distal shaft segment may be disposed on an engagement member. The engagement member may be resiliently biased distally to urge the distally facing engagement surface of the distal shaft segment against one of the plurality of engagement surfaces at the proximal end of the neck component, thereby resisting relative movement between the neck component and the distal shaft segment. Biasing the engagement member in this manner may be used to maintain an orientation of the neck component relative to the distal shaft segment during use.

[0025] The engagement member may be capable of being retracted proximally along the longitudinal axis of the distal shaft segment to disengage the distally facing engagement surface of the distal shaft segment from the engagement surface at the proximal end of the neck component, thereby allowing the neck component to freely pivot relative to the distal shaft segment. This may allow the surgeon to release the neck component so that the neck component can be freely pivoted when selecting an orientation between the neck component and the distal shaft segment. The engagement member may include a gripping surface for allowing the surgeon to manually operate the engagement member.

[0026] The engagement member may be substantially tubular. The drive train may pass through the center of the engagement member. The engagement member may be arranged as a sleeve on the outer surface of the distal shaft section. Such an arrangement of the engagement member is relatively compact. It is also contemplated that the engagement member may be at least partially arranged within the distal shaft section.

[0027] The distally-facing engagement surface at the distal end of the distal shaft section can be substantially annular.

[0028] The distally facing engagement surface and each of the plurality of engagement surfaces at the proximal end of the neck component may be substantially flat.This may avoid the need for intricate arrangements for fixing the orientation of the neck component relative to the distal shaft section.

[0029] The drive train may include at least one of: a universal joint at the pivot point between the distal end of the distal shaft section and the proximal end of the neck component; and a universal joint at the pivot point between the distal end of the additional shaft section and the proximal end of the distal shaft section. This may allow for accommodating the angle of the distal shaft section relative to the neck component and / or the angle of the additional shaft section relative to the distal shaft section.

[0030] The attachment between the distal shaft section and the additional shaft section may be configured similarly to the attachment between the neck component and the distal shaft section.

[0031] The acetabular reamer handle may include a distally facing engagement surface at the distal end of the additional shaft segment and a plurality of engagement surfaces at the proximal end of the distal shaft segment, wherein the distal shaft segment is capable of pivoting relative to the additional shaft segment to present each of the plurality of engagement surfaces of the distal shaft segment to the distally facing engagement surface at the distal end of the additional shaft segment, thereby orienting the distal shaft segment and the additional shaft segment at a corresponding angle relative to each other. Providing the plurality of engagement surfaces at the proximal end of the distal shaft segment may allow the surgeon to conveniently select a predetermined angle (e.g., 0°, +30°, -30°, +45°, -45°, +60°, -60°, etc.) of the distal shaft segment relative to the additional shaft segment, the selected angle being achieved by selectively engaging one of the plurality of engagement surfaces with the distally facing engagement surface at the distal end of the additional shaft segment.

[0032] The distally facing engagement surface of the additional shaft segment may be disposed on an engagement member. The engagement member of the additional shaft segment may be resiliently biased distally to push the distally facing engagement surface of the additional shaft segment against one of the plurality of engagement surfaces at the proximal end of the distal shaft segment, thereby resisting relative movement between the distal shaft segment and the additional shaft segment. Biasing the engagement member of the additional shaft segment in this manner may be used to maintain the orientation of the distal shaft segment relative to the additional shaft segment during use.

[0033] The engagement member of the additional shaft section may be capable of retracting proximally along the longitudinal axis of the additional shaft section to disengage the distally facing engagement surface of the additional shaft section from the engagement surface at the proximal end of the distal shaft section, thereby allowing the distal shaft section to freely pivot relative to the additional shaft section. This may allow the surgeon to release the distal shaft section so that the distal shaft section can be freely pivoted when selecting an orientation between the distal shaft section and the additional shaft section. The engagement member of the additional shaft section may include a gripping surface for allowing the surgeon to manually operate the engagement member of the additional shaft section.

[0034] The engagement member of the additional shaft section may be substantially tubular. The drive train may pass through the center of the engagement member of the additional shaft section. The engagement member of the additional shaft section may be arranged as a sleeve on the outer surface of the additional shaft section. Such a configuration of the engagement member of the additional shaft section is relatively compact. It is also envisaged that the engagement member of the additional shaft section may be at least partially arranged within the distal shaft section.

[0035] The distally facing engagement surface at the distal end of the additional shaft segment may be substantially annular.

[0036] The distally facing engagement surface at the distal end of the additional shaft segment and each of the plurality of engagement surfaces at the proximal end of the distal shaft segment may be substantially flat. This may avoid the need for intricate arrangements for fixing the orientation of the distal shaft segment relative to the additional shaft segment.

[0037] The distal end of the additional shaft segment and the proximal end of the distal shaft segment are pivotally attached to allow the additional shaft segment and the distal shaft segment to be adjustably oriented at an angle relative to each other only in a first plane, and the distal end of the distal shaft segment is pivotally attached to the proximal end of the neck component to allow the distal shaft segment and the neck component to be adjustably oriented at an angle relative to each other only in the first plane.

[0038] The shaft may comprise two shaft sections.The additional shaft section may be a proximal shaft section of the shaft.

[0039] The shaft may include more than two shaft sections. The additional shaft section may be an intermediate shaft section, and the shaft may include one or more additional pivotally connected shaft sections arranged proximally of the intermediate shaft section. This may provide additional flexibility, for example, to work around soft tissue in an incision site.

[0040] In one embodiment, the shaft includes a plurality of shaft sections, including: the distal shaft section; the additional shaft section forming a first intermediate shaft section of the shaft; another shaft section forming a second intermediate shaft section, wherein the distal end of the second intermediate shaft section is pivotally attached to the proximal end of the first intermediate shaft section; and another shaft section forming a proximal shaft section of the shaft, wherein the distal end of the proximal shaft section is pivotally attached to the proximal end of the second intermediate shaft section. This can allow the acetabular reamer handle to adopt a substantially C-shaped configuration, wherein the longitudinal axis of the neck component is oriented substantially parallel to the longitudinal axis of the proximal shaft section of the shaft.

[0041] According to another aspect of the present invention, a surgical kit is provided, which includes the acetabular reamer handle described above and one or more acetabular reamer of different sizes, which can be connected to the head component of the drive train of the acetabular reamer handle.

[0042] According to another aspect of the present invention, there is provided a method for reaming a patient's acetabulum, the method comprising:

[0043] The head component of the drive train that connects the reamer to the acetabular reamer handle, which includes:

[0044] A hollow shaft having a plurality of shaft sections, the plurality of shaft sections comprising:

[0045] a distal shaft section having a distal end and a proximal end;

[0046] as well as

[0047] an additional shaft segment having a distal end pivotally attached to the proximal end of the distal shaft segment;

[0048] a hollow neck member having a longitudinal axis; and

[0049] Drivetrain,

[0050] wherein a drive train extends through the shaft and the neck component, wherein the head component is mounted for rotation about a longitudinal axis of the neck component, and wherein a distal end of the distal shaft section is pivotally attached to a proximal end of the neck component,

[0051] orienting the neck component and the distal shaft segment at a first angle relative to each other;

[0052] orienting the additional shaft segment and the distal shaft segment at a second angle relative to each other; and

[0053] When the reamer is located in the patient's acetabulum, the drive train is operated to apply torque to the reamer.

[0054] By orienting the neck component, the distal shaft section, and the additional shaft section appropriately, the acetabular reamer shank can adopt a variety of different configurations. For example, the acetabular reamer shank can be operated as an offset reamer shank, as a reamer shank including a single bend, and / or as a substantially straight reamer shank without a bend. This can allow the use of a single tool to provide the functionality of different types of acetabular reamer shanks. This can reduce the cost, weight, and cleaning time of a surgical kit that includes an acetabular reamer shank. In addition, the configuration of the acetabular reamer shank can be conveniently changed during surgery, which can avoid the need to switch between different types of acetabular reamer shanks.

[0055] Orienting the neck component and the distal shaft segment at a first angle relative to each other may include: pivoting the neck component to present one of a plurality of engagement surfaces at the proximal end of the neck component to a distally-facing engagement surface at the distal end of the distal shaft segment. Providing the plurality of engagement surfaces at the proximal end of the neck component may allow a surgeon to conveniently select a predetermined angle (e.g., 0°, +30°, -30°, +45°, -45°, +60°, -60°, etc.) of the neck component relative to the distal shaft segment by selectively engaging one of the plurality of engagement surfaces with the distally-facing engagement surface at the distal end of the distal shaft segment.

[0056] The distally facing engagement surface of the distal shaft segment may be disposed on an engagement member. The engagement member may be resiliently biased distally to push the distally facing engagement surface of the distal shaft segment against one of the plurality of engagement surfaces at the proximal end of the neck component, thereby resisting relative movement between the neck component and the distal shaft segment. The method may also include manually retracting the engagement member in a proximal direction to disengage the distally facing engagement surface of the distal shaft segment from one of the engagement surfaces at the proximal end of the neck, thereby allowing the neck component to freely pivot relative to the distal shaft segment. This may allow the surgeon to release the neck component so that the neck component can be freely pivoted when selecting an orientation between the neck component and the distal shaft segment.

[0057] Orienting the additional shaft segment and the distal shaft segment at a second angle relative to each other may include: pivoting the distal shaft segment to present one of a plurality of engagement surfaces at the proximal end of the distal shaft segment to a distally-facing engagement surface at the distal end of the additional shaft segment. Providing the plurality of engagement surfaces at the proximal end of the distal shaft segment may allow a surgeon to conveniently select a predetermined angle (e.g., 0°, +30°, -30°, +45°, -45°, +60°, -60°, etc.) of the distal shaft segment relative to the additional shaft segment by selectively engaging one of the plurality of engagement surfaces with the distally-facing engagement surface at the distal end of the additional shaft segment.

[0058] The distally facing engagement surface of the additional shaft segment may be disposed on an engagement member. The engagement member may be elastically biased distally to push the distally facing engagement surface of the additional shaft segment against one of the plurality of engagement surfaces at the proximal end of the distal shaft segment, thereby resisting relative movement between the additional shaft segment and the distal shaft segment. The method may also include manually retracting the engagement member of the additional shaft segment in a proximal direction so that the distally facing engagement surface of the additional shaft segment is disengaged from one of the engagement surfaces at the proximal end of the distal shaft segment, thereby allowing the additional shaft segment to freely pivot relative to the distal shaft segment. This may allow the surgeon to release the distal shaft segment so that the distal shaft segment can be freely pivoted when selecting an orientation between the distal shaft segment and the additional shaft segment.

[0059] The method may include orienting the additional shaft segment and the distal shaft segment at a first angle relative to each other in a first plane, and orienting the distal shaft segment and the neck component at a second angle relative to each other in the first plane.

[0060] In the first plane, the first angle may be equal and opposite to the second angle.This may allow the neck component to be oriented parallel to the additional shaft section during reaming. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Embodiments of the invention will hereinafter be described, by way of example only, with reference to the accompanying drawings, in which like reference numerals associate with like elements, and in which:

[0062] Figure 1A A side view of an acetabular reamer handle according to an embodiment of the present invention is shown;

[0063] Figure 1B 1 , with the acetabular reamer connected to a distal head component of a drive train of the acetabular reamer handle;

[0064] Figure 2 Shows Figure 1A Another side view of the acetabular reamer handle;

[0065] Figure 3 Shows Figure 1A Another side view of the acetabular reamer handle;

[0066] Figure 4 Shows Figure 1A An exploded view of the acetabular reamer handle;

[0067] Figure 5 Shows Figure 1A A cross-section of the shank of the acetabular reamer; and

[0068] Figure 6 A side view of an acetabular reamer handle according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0069] Embodiments of the present invention are described below with reference to the accompanying drawings.

[0070] Figure 1 to Figure 5 A number of different views of an acetabular reamer handle 10 are shown in accordance with an embodiment of the present invention.

[0071] The acetabular reamer handle 10 includes a shaft 20. Figure 5 As can be seen in the cross-section of FIG. 1 , the shaft 20 is substantially hollow. The shaft includes a plurality of shaft segments. The shaft segments may be substantially cylindrical and may have a substantially circular cross-section. In the present embodiment, the shaft segments include a distal shaft segment 20A and an additional shaft segment 20B. In the present embodiment, the shaft 20 includes only two shaft segments, whereby the additional shaft segment 20B may be considered a proximal shaft segment. It is contemplated that the shaft 20 may include more than two (e.g., three, four, ...) shaft segments, including the shaft segments shown in FIGS. 1 to 20A. Figure 5 The distal shaft section 20A of the type shown in FIG. Figure 5 An additional shaft segment 20B of the type shown (in this case, the additional shaft segment 20B can be regarded as an intermediate shaft segment) and one or more further shaft segments. Each further shaft segment in such an embodiment can be similar to that of FIGS. 1 to 3. Figure 5 The hollow shaft 20 may be constructed as an additional shaft segment 20B of the type shown in the drawings and may be connected in sequence proximally relative to the additional shaft segment 20B. These additional shaft segments may include a proximal shaft segment located at the proximal end of the hollow shaft 20, and one or more intermediate shaft segments optionally located between the additional shaft segment 20B and the aforementioned proximal shaft segment.

[0072] Each shaft can be generally elongated and cylindrical in shape. Each shaft segment has a distal end and a proximal end. For example, in this embodiment, the distal shaft segment 20A has a distal end 22 and a proximal end 24, and the additional shaft segment 20B includes a distal end 32 and a proximal end 34.

[0073] One or more handle components 60 may be provided on the shaft 20 to facilitate gripping of the acetabular reamer handle 10 and to allow the surgeon to apply an axial force for pushing the reamer attached to the distal end of the acetabular reamer handle 10 into the inner surface of the patient's acetabulum during reaming. As shown in FIGS. 1 to 5 , each handle component 60 may extend radially outward from the side of one of the shaft segments of the shaft 20. In the present embodiment, the acetabular reamer handle 10 includes a single handle component 60 that extends radially outward from the side of the additional shaft segment 20B.

[0074] The acetabular reamer handle 10 also includes a neck component 6. The neck component 6 is substantially hollow. The neck component can be substantially cylindrical and can have a substantially circular cross-section. The neck component 6 has a proximal end 62, a distal end 64, and a longitudinal axis 46. Each shaft segment also has a longitudinal axis. In this embodiment, the distal shaft segment 20A has a longitudinal axis 26, and the additional shaft segment has a longitudinal axis 66.

[0075] As will be described in more detail below, the proximal end 62 of the neck component 6 is pivotally connected to the distal end 22 of the distal shaft segment 20A, and the proximal end 24 of the distal shaft segment 20A is pivotally connected to the distal end 32 of the additional shaft segment 20B. In embodiments in which additional shaft segments are included, each additional shaft segment can be connected proximally in sequence relative to the additional shaft segment 20B using a pivotal connection and locking mechanism of the type described below with respect to the pivotal connection and locking mechanism between the distal shaft segment 20A and the additional shaft segment 20B.

[0076] The acetabular reamer handle 10 also includes a transmission system 40. The transmission system 40 is Figure 4 1 to 40. Figure 3 For clarity, Figure 5 Only the head component 42 of the drive train 40 (which will be described below) is shown in the cross section of FIG. The drive train 40 is elongated and sized to fit inside and extend through the hollow shaft 20 and neck component 6.

[0077] The transmission system 40 may include a plurality of transmission system sections. In the present embodiment, these transmission system sections include a distal transmission system section 40A and an additional transmission system section 40B. In the present embodiment, the additional transmission system section 40B may be considered a proximal transmission system section. Generally speaking, the transmission system 40 may include a corresponding transmission system section for each shaft section of the hollow shaft 20. In order to accommodate any pivoting of the shaft sections and the neck component 6 relative to each other, the transmission system 40 may include universal joints positioned along its length to coincide with the pivotal connections between the various shaft sections and the neck component 6. In the present embodiment, the transmission system 40 includes a first universal joint 48A that joins the proximal end of the head component 42 of the transmission system 40 to the distal end of the distal transmission system section 40A and a second universal joint 48B that connects the proximal end of the distal transmission system section 40A to the distal end of the additional transmission system section 40B.

[0078] The proximal end 34 of the proximal shaft section of the acetabular reamer handle 10 (which is formed by the additional shaft section 20B in the present embodiment having two shaft sections) can have an opening through which the proximal end 45 of the drive train 40 can protrude. The proximal end 45 of the drive train 40 can include a connection feature for connecting to a power tool (such as a rotary driver for applying torque to the drive train 40). In use, the drive train 40 rotates to transmit torque to the distal head component 42 of the drive train 40 through the hollow shaft 20 and the neck component 6. The head component 42 of the drive train 40 can be connected to the reamer 100. Figure 1B Shows Figure 1A 10, wherein the acetabular reamer 100 is connected to the head component 42 of the drive train 40. In order to achieve the connection between the head component 42 and the acetabular reamer 100, the head component 42 may include a distally located connection feature 44 for connecting with a corresponding connection feature of the acetabular reamer 100. Figure 1B As shown, the acetabular reamer 100 may include, for example, a hemispherical dome 102 for insertion into the acetabulum of a patient. The outer surface of the dome 102 may include features 104 for reaming bone from the inner surface of the acetabulum when the acetabular reamer 100 is rotated with the drive train 40.

[0079] The head component 42 is mounted to rotate about the longitudinal axis 46 of the neck component 6. The rotation axis of the head component 42 can be roughly coaxial with the longitudinal axis 46. In this example, the proximal end of the head component 42 is located inside the neck component 6. The outer surface of the head component 42 (e.g., the outer surface of the proximal end of the head technology in this embodiment) can form a close fit with the inner surface of the neck component 6, so that the head component 42 is placed in the neck component 6 to maintain the coaxial relationship between the rotation axis of the head component 42 and the longitudinal axis 46. In this embodiment, the distal end of the head component 42 protrudes distally from the distal end 62 of the neck component 6 and includes the aforementioned connection feature 44 for connecting to the acetabular reamer. The distal end 64 of the head component 42 can be roughly cylindrical and can have a larger diameter than the proximal end of the head component 42 that rotates in the neck component 6. In this embodiment, the distal end of the head component 42 has the same outer diameter as the distal end 62 of the neck component 6 , such that the distal end of the head component 42 is flush with the outer surface of the distal end 62 of the neck component 6 .

[0080] The shaft segments may have different lengths (as measured along their longitudinal axes). For example, in this embodiment, the distal shaft segment 20A is shorter than the additional shaft segment 20B. The head component 42 (as measured along its longitudinal axis 46) may be shorter than the shaft segments.

[0081] As previously described, the proximal end 62 of the neck component 6 is pivotally connected to the distal end 22 of the distal shaft segment 20A, and the proximal end 24 of the distal shaft segment 20A is pivotally connected to the distal end 32 of the additional shaft segment 20B.

[0082] In this embodiment, the pivot connection 70 between the proximal end 62 of the neck component 6 and the distal end 22 of the distal shaft segment 20A is formed by a pair of holes 72A located at the distal end 22 of the distal shaft segment 20A and a pair of corresponding holes 7 located on the neck component 7, through which the bolt 74A passes. The rotation axis 76A provided by the pivot connection 70 is generally perpendicular to both the longitudinal axis 46 of the neck component 6 and the longitudinal axis 26 of the distal shaft segment 20A. Figure 4 As shown, the hole 72A can be located at the end of a pair of arms extending distally from the end of the distal shaft section 20A. These arms can provide clearance between the hollow cylindrical part of the distal shaft section 20A and the proximal end 62 of the neck component 6 to allow the neck component 6 to rotate around the pivot connection 70.

[0083] In this embodiment, the pivot connection 170 between the proximal end 24 of the distal shaft segment 20A and the distal end 32 of the additional shaft segment 20B is formed by a pair of holes 72B located at the distal end 32 of the additional shaft segment 20B and a pair of corresponding holes 77 located at the proximal end 24 of the distal shaft segment 20A, through which the bolt 74B passes. The rotation axis 76B provided by the pivot connection 170 is generally perpendicular to both the longitudinal axis 26 of the distal shaft segment 20A and the longitudinal axis 66 of the additional shaft segment 20B. Figure 4 As shown, the hole 72B can be located at the end of a pair of arms extending distally from the end of the additional shaft segment 20B. These arms can provide clearance between the hollow cylindrical component of the additional shaft segment 20B and the proximal end 24 of the distal shaft segment 20A to allow the distal shaft segment 20A to rotate about the pivot connection 170.

[0084] The pivot connections 70, 170 may allow the neck component 6, the distal shaft section 20A, and the additional shaft section 20B to be adjustably oriented at an angle relative to each other. This may allow the acetabular reamer handle 10 to adopt a variety of different configurations. There are several common surgical approaches for total hip arthroplasty (THA), such as direct anterior approach, anterolateral approach, posterolateral approach, posterior approach, direct superior approach, and multiple incision approaches. The surgeon's choice of handle configuration may be based on the surgical approach used, their handle preference, and the patient's anatomy.

[0085] For example, by properly angulating the neck component 6, the distal shaft section 20A, and the additional shaft section 20B, the acetabular reamer handle 10 can be operated as an offset reamer handle, such as Figure 3 As shown. In this configuration, the neck component 6 is angled about the pivot connection 70 so that the longitudinal axis 46 of the neck component 6 is oriented at a non-zero angle α relative to the longitudinal axis 26 of the distal shaft segment 20A. The angle may, for example, be in the range of 30°≤α≤60°. It should be noted that the neck component 6 can pivot in either direction. Similarly, the distal shaft segment 20A is angled about the pivot connection 170 so that the longitudinal axis 26 of the distal shaft segment 20A is oriented at a non-zero angle β relative to the longitudinal axis 66 of the additional shaft segment 20B. Typically, the angle β used for adopting an offset reamer handle configuration may be equal in magnitude to the angle α. Therefore, the angle β may also, for example, be in the range of 30°≤β≤60°. However, as in Figure 3 As can be seen in FIG. 1 , the angle β for employing an offset reamer shank configuration is generally in the opposite direction to the angle α. By way of example only, an offset reamer shank is commonly used in hip replacement surgery where a posterolateral approach is used.

[0086] In another example, the acetabular reamer handle 10 may include a single curved portion. Figure 2As shown. In this configuration, the longitudinal axis 26 of the distal shaft segment 20A and the longitudinal axis 66 of the additional shaft segment 20B are aligned to be parallel, and the neck component 6 is angled about the pivot connection 70 so that the longitudinal axis 46 of the neck component 6 is oriented at a non-zero angle α relative to the longitudinal axis 26 of the distal shaft segment 20A. The angle α can be, for example, in the range of 30°≤α≤60°. It should be noted again that the neck component 6 can pivot in either direction. By way of example only, a reamer handle including a single bend is typically used in hip replacement surgery in which an anterior approach is used.

[0087] In yet another example, the acetabular reamer handle 10 may be a straight reamer handle that does not include a curved portion, such as Figure 1A and 1B In this configuration, the longitudinal axis 46 of the neck component 6, the longitudinal axis 26 of the distal shaft segment 20A, and the longitudinal axis 66 of the additional shaft segment 20B are aligned parallel (α=β=0). By way of example only, straight reamer handles are commonly used in hip replacement surgeries where a posterolateral approach is used.

[0088] This can allow a single tool to be used to provide the functionality of different types of acetabular reamer handles. This can reduce the cost, weight, and cleaning time of surgical kits that include acetabular reamer handles. In addition, the configuration of the acetabular reamer handle can be conveniently changed during surgery, which can avoid the need to switch between different types of acetabular reamer handles.

[0089] In this embodiment, the axes of rotation 76A, 76b of the pivot connections 70, 170 are substantially parallel. Although this is not considered necessary, it allows the conventional configuration of an offset reamer handle to be adopted. Specifically, when the acetabular reamer handle 10 adopts the offset reamer handle configuration, the axis 46 of the neck component 6, the axis 26 of the distal shaft section 20A, and the axis 66 of the additional shaft section 20B are all contained in the same plane.

[0090] It is noted that the universal joint 48A of the transmission system 40 is positioned to coincide with the pivot connection 70 between the proximal end 62 of the neck component 6 and the distal end 22 of the distal shaft section 20A. Specifically, the universal joint 48A can be located at the intersection between the axes 46, 26 and 76A. This can allow for the above-mentioned angle of the neck component 6 relative to the distal shaft section 20A to be accommodated. Similarly, the universal joint 48B of the transmission system 40 is positioned to coincide with the pivot connection 170 between the proximal end 24 of the distal shaft section 20A and the distal end 32 of the additional shaft section 20B. Specifically, the universal joint 48B can be located at the intersection between the axes 26, 66 and 76B. This can allow for the above-mentioned angle of the distal shaft section 20A relative to the additional shaft section 20B to be accommodated.

[0091] One or more of the pivot connections 70, 170 of the acetabular reamer handle 10 may include a locking mechanism for keeping the relative orientation of the neck component 6 and the various shaft segments fixed while the patient's acetabulum is being reamed.

[0092] In this embodiment, the pivot connection 70 is provided with a locking mechanism including an engagement member 50 having a substantially annular engagement surface 51. The engagement member 50 is located at the distal end 22 of the distal shaft segment 20A. The engagement member 50 can be substantially tubular and can be mounted as a sleeve on the outer surface of the distal shaft segment 20A. The drive train 40 can pass through the center of the engagement member 50.

[0093] In this embodiment, the locking mechanism further comprises a spring, such as a coil spring 80. The coil spring 80 may be located between the engagement member 50 and a circumferential lip 21A on the outer surface of the distal shaft section 20A. The spring (eg, coil spring 80) is arranged to bias the engagement member 50 distally.

[0094] In use, the spring of the locking mechanism urges the engagement surface 51 of the engagement member 50 against the proximal end 62 of the neck component 6 , which resists pivotal movement of the neck component 6 relative to the distal shaft section 20A.

[0095] In this embodiment, the proximal end 62 of the neck component 6 is provided with a plurality of engagement surfaces 8A, 8B, 8C. The engagement surfaces 8A, 8B, 8C and the engagement surface 51 may be substantially flat so as to provide a stable and secure contact between these surfaces. The neck component 6 is capable of pivoting around the pivot connection 70 to present each of the plurality of engagement surfaces 8A, 8B, 8C to the engagement surface 51 of the engagement member. This allows the neck component 6 to be maintained at an angle with the distal shaft section 20A, corresponding to the angle between the surface normal of the selected engagement surfaces 8A, 8B, 8C and the longitudinal axis 46 of the neck component 6. The method allows a plurality of discrete and predetermined angles (e.g., 0°, +30°, -30°, +45°, -45°, +60°, -60°, etc.) to be provided between the neck component 6 and the distal shaft section 20A. For example, in this embodiment:

[0096] The engagement surface 8A can engage with the engagement surface 51 of the engagement member 50 to angle (and maintain) the longitudinal axis 46 of the neck component 6 to the longitudinal axis 26 of the distal shaft section 20A at +30° (see Figure 3 );

[0097] The engagement surface 8B can engage with the engagement surface 51 of the engagement member 50 to angle (and maintain) the longitudinal axis 46 of the neck component 6 with the longitudinal axis 26 of the distal shaft segment 20A such that the longitudinal axis 46 is parallel to the longitudinal axis 26 (i.e., the angle is 0°) (see Figure 1A );as well as

[0098] The engagement surface 8C can engage with the engagement surface 51 of the engagement member 50 to cause the longitudinal axis 46 of the neck component 6 to be (and remain) at an angle of -30° to the longitudinal axis 26 of the distal shaft section 20A (see Figure 2 ).

[0099] Although the present example includes three engagement surfaces 8A, 8B, 8C, it is envisaged that a different number of such surfaces may be provided.

[0100] To release the engagement surface 51 from the proximal end 62 of the neck component 6, the engagement member 50 can be retracted in the proximal axial direction against the bias provided by the spring 80. The engagement member 50 can include a gripping surface 52 for assisting the surgeon in manually retracting the engagement member 50. When the proximal end 62 (e.g., one of the engagement surfaces 8A, 8B, 8C) is released from the engagement surface 51 by retraction of the engagement member 50, the neck component 6 is free to pivot about the pivot connection 70. The surgeon can then angle the neck component 6 as desired (e.g., by presenting a different one of the engagement surfaces 8A, 8B, 8C to the engagement surface 51) and then release the engagement member 50 so that the engagement surface 51 reengages with the proximal end 62 of the neck component 6 under the bias provided by the spring 80.

[0101] In this embodiment, the pivot connection 170 is provided with a locking mechanism similar to the locking mechanism described above with respect to the locking mechanism of the pivot connection 70. The locking mechanism of the pivot connection includes an engagement member 150 having a substantially annular engagement surface 151. The engagement member 150 is located at the distal end 32 of the additional shaft section 20B. The engagement member 150 can be substantially tubular and can be mounted as a sleeve on the outer surface of the distal shaft section 20B. The drive train 40 can pass through the center of the engagement member 150.

[0102] In this embodiment, the locking mechanism further comprises a spring, such as a coil spring 82. The coil spring 82 may be located between the engagement member 150 and a circumferential lip 21B on the outer surface of the additional shaft section 20B. The spring (eg, coil spring 82) is arranged to bias the engagement member 150 distally.

[0103] In use, the spring 82 of the locking mechanism urges the engagement surface 151 of the engagement member 150 against the proximal end 24 of the distal shaft segment 20A, which resists pivotal movement of the distal shaft segment 20A relative to the additional shaft segment 20B.

[0104] In this embodiment, the proximal end 24 of the distal shaft segment 20A is provided with a plurality of engagement surfaces 9A, 9B. The engagement surfaces 9A, 9B and the engagement surface 151 may be substantially flat so as to provide a stable and secure contact between these surfaces. The distal shaft segment 20A is capable of pivoting around the pivot connection 170 to present each of the plurality of engagement surfaces 9A, 9B to the engagement surface 151 of the engagement member. This may allow the distal shaft segment 20A to be maintained at an angle with the additional shaft segment 20B, the angle corresponding to the angle between the surface normal of the selected engagement surfaces 9A, 9B and the longitudinal axis 26 of the distal shaft segment. The method may allow a plurality of discrete and predetermined angles (e.g., 0°, +30°, -30°, +45°, -45°, +60°, -60°, etc.) to be provided between the distal shaft segment 20A and the additional shaft segment 20B. For example, in this embodiment:

[0105] The engagement surface 9A can engage with the engagement surface 151 of the engagement member 150 to angle (and maintain) the longitudinal axis 26 of the distal shaft segment with the longitudinal axis 66 of the additional shaft segment 20B such that the longitudinal axis 26 is parallel to the longitudinal axis 66 (i.e., the angle is 0°) (see Figure 1A and Figure 1B );as well as

[0106] The engagement surface 9B can engage with the engagement surface 151 of the engagement member 150 to angle (and maintain) the longitudinal axis 26 of the distal shaft segment 20A to the longitudinal axis 66 of the additional shaft segment 20B at -30° (see Figure 3 ).

[0107] Although the present example includes two engagement surfaces 9A, 9B, it is envisaged that a different number of such surfaces may be provided.

[0108] To release the engagement surface 151 from the proximal end 24 of the distal shaft segment 20A, the engagement member 150 can be retracted in the proximal axial direction against the bias provided by the spring 82. The engagement member 150 can include a gripping surface 152 for assisting the surgeon in manually retracting the engagement member 150. When the proximal end 24 (e.g., one of the engagement surfaces 9A, 9B) is released from the engagement surface 151 by retraction of the engagement member 150, the distal shaft segment 20A is free to pivot about the pivot connection 170. The surgeon can then angle the distal shaft segment 20A as desired (e.g., by presenting a different one of the engagement surfaces 9A, 9B to the engagement surface 151), and then release the engagement member 150, causing the engagement surface 151 to reengage with the proximal end 24 of the distal shaft segment 20A under the bias provided by the spring 82.

[0109] Acetabular reamer handles according to embodiments of the present invention may be included in a surgical kit. The kit may also include one or more acetabular reamer drills 100 of different sizes that can be connected to the head component of the drive train of the acetabular reamer handle. A kit including an acetabular reamer handle according to embodiments of the present invention may eliminate the need to provide multiple reamer handles with different configurations. This may reduce the cost, weight, and cleaning time of the kit.

[0110] In one embodiment, a method of reaming a patient's acetabulum may include connecting an acetabular reamer 100 to a head component 42 of a drive train 40 of an acetabular reamer handle 10 of the type described above. The method may also include orienting the neck component 6 and the distal shaft segment 20A relative to each other at a first angle. The method may also include orienting the additional shaft segment 20A and the distal shaft segment 20B relative to each other at a second angle. The method may also include operating the drive train 40 (e.g., by connecting the proximal end 45 of the drive train to a rotary power tool and turning on the rotary power tool) to apply torque to the acetabular reamer 100 when the acetabular reamer 100 is located in the patient's acetabulum.

[0111] Orienting the neck component 6 and the distal shaft segment 20A at the first angle relative to each other may include pivoting the neck component 6 to present one of the plurality of engagement surfaces 8A, 8B, 8C at the proximal end 62 of the neck component 6 to the distally facing engagement surface 51 at the distal end 22 of the distal shaft segment 20A. This may also include manually retracting the engagement member 50 in a proximal direction to disengage the distally facing engagement surface 51 of the distal shaft segment 20A from one of the engagement surfaces 8A, 8B, 8C, thereby allowing the neck component 6 to freely pivot relative to the distal shaft segment 20A.

[0112] Similarly, orienting the distal shaft segment 20A and the additional shaft segment 20B at a second angle relative to each other may include pivoting the distal shaft segment 20A to present the plurality of engagement surfaces 9A, 9B at the proximal end 24 of the distal shaft segment 20A to the distally facing engagement surface 151 at the distal end 32 of the additional shaft segment 20B. This may also include manually retracting the engagement member 150 in a proximal direction to disengage the distally facing engagement surface 151 of the additional shaft segment 20B from one of the engagement surfaces 9A, 9B, thereby allowing the distal shaft segment 20A to freely pivot relative to the additional shaft segment 20B.

[0113] Figure 6 A side view of an acetabular reamer handle 10 according to another embodiment of the present invention is shown.

[0114] The acetabular reamer handle 10 includes a neck component 6. In this embodiment, the neck component 6 is substantially the same as the neck component 6 described above with respect to the embodiment of Figure 1 and will not be described in detail here.

[0115] In this embodiment, the shaft 20 comprises four shaft sections.

[0116] The shaft sections include a distal shaft section 20A. The distal shaft section 20A is substantially the same as the distal shaft section 20A described above with respect to the embodiment of FIG. 1 and will not be described in detail here.

[0117] The shaft sections also include a first intermediate shaft section 20C. The first intermediate shaft section 20C has a proximal end 204 and a distal end 202. The distal end 202 is pivotally attached to the proximal end 24 of the distal shaft section 20A. The first intermediate shaft section 20C has a longitudinal axis 266.

[0118] The shaft sections also include a second intermediate shaft section 20D. The second intermediate shaft section 20C has a proximal end 304 and a distal end 302. The distal end 302 is pivotally attached to the proximal end 204 of the first intermediate shaft section 20C. The second intermediate shaft section 20D has a longitudinal axis 366.

[0119] The shaft segments also include a proximal shaft segment 20E. The proximal shaft segment 20E has a proximal end 404 and a distal end 402. The distal end 402 of the proximal shaft segment 20E is pivotally attached to the proximal end 304 of the second intermediate shaft segment 20D. The proximal shaft segment 20E has a longitudinal axis 466. Aside from the fact that the proximal shaft segment 20E is pivotally attached to the second intermediate shaft segment 20D, in this embodiment, the proximal shaft segment 20E is substantially identical to the additional shaft segment 20B that forms the proximal shaft segment in the embodiment of FIG. 1 .

[0120] In this embodiment, the acetabular reamer handle 10 includes a drive train. The drive train includes a head component 42. The drive train can be the same as described above with respect to Figure 4 The drive train of this embodiment includes four drive train sections (i.e., a respective drive train section for each of the shaft sections of shaft 20). As described above, the drive train sections can be connected together by universal joints at the pivot points between the shaft sections. As with the embodiment of FIG. 1 , the proximal end 404 of the proximal shaft section 20E can include an opening through which the proximal end of the drive train can protrude.

[0121] In this embodiment, the pivot attachment (including the corresponding optional locking mechanism) is located:

[0122] Between the distal shaft section 20A and the first intermediate shaft section 20C;

[0123] between the first intermediate shaft section 20C and the second intermediate shaft section 20D; and

[0124] Between the second intermediate shaft section 20D and the proximal shaft section 20E,

[0125] These pivot attachments are all constructed in substantially the same manner as the pivot attachments and optional locking mechanisms between the distal shaft segment 20A and the additional shaft segment 20B in the embodiment of FIG. 1. Therefore, the details of these pivot attachments and corresponding locking mechanisms in this embodiment will not be described in detail herein, except that the plurality of engagement surfaces 309A, 309B at the proximal end 304 of the second intermediate shaft segment 20D are oriented differently than the engagement surfaces at the proximal ends of the distal shaft segment 20A and the first intermediate shaft segment 20C. This allows the second intermediate shaft segment 20D and the proximal shaft segment 20E to pivot (and then lock) in a direction opposite to the direction in which the other shaft segments of the shaft 20 pivot and lock.

[0126] exist Figure 6 , the pivot angle between the neck component 6 and the distal shaft segment 20A is represented as α, the pivot angle between the distal shaft segment 20A and the first intermediate shaft segment 20C is represented as β, the pivot angle between the first intermediate shaft segment 20C and the second intermediate shaft segment 20D is represented as χ, and the pivot angle between the second intermediate shaft segment 20D and the proximal shaft segment 20E is represented as δ.

[0127] As described herein, the pivotal connection between the neck component 6 and the various shaft segments can allow the acetabular reamer handle 10 to adopt a variety of different configurations. For example, it should be understood that Figure 6The acetabular reamer shank 10 of the embodiments can be configured as an offset reamer shank (by way of example only, wherein α≠0 (e.g., ±30°, ±45°, ±60°, etc.); β=-α; and χ=δ=0), as an reamer shank including a single bend (wherein one of α, β, χ or δ is non-zero and the remaining angle is zero), and / or as a substantially straight reamer shank having no bend therein (α=β=χ=δ=0).

[0128] like Figure 6 As shown, in this embodiment, the pivotal connection locking mechanism between the neck component 6, the distal shaft segment 20A, the first intermediate shaft segment 20C, the second intermediate shaft segment 20D and the proximal shaft segment 20E can also allow the acetabular reamer handle 10 to adopt a substantially C-shaped configuration. For example, in one embodiment, it is contemplated that the neck component 6 and the various shaft segments can be arranged (pivoted) such that α≠0 (e.g., ±30°, ±45°, ±60°, etc.); β=-α; χ=β=-α; δ=α. In such embodiments, the longitudinal axis 46 of the neck component 6 is oriented substantially parallel to the longitudinal axis 466 of the proximal shaft segment 20E.

[0129] Thus, an acetabular reamer handle and a method for reaming an acetabulum have been described. The handle includes a hollow shaft having a plurality of shaft sections, the plurality of shaft sections including a distal shaft section having a distal end and a proximal end and an additional shaft section having a distal end, the distal end of the additional shaft section being pivotally attached to the proximal end of the distal shaft section to allow the additional shaft section and the distal shaft section to be adjustably oriented at an angle. The handle also includes a hollow neck component having a longitudinal axis. The handle also includes a drive train having a head component mounted to rotate about the longitudinal axis and capable of being connected to the reamer. The distal end of the distal shaft section is pivotally attached to the proximal end of the neck component to allow the distal shaft section and the neck component to be adjustably oriented at an angle.

[0130] Although specific embodiments of the invention have been described, it will be appreciated that numerous modifications / additions and / or supplements may be made within the scope of the invention as claimed.

Claims

1. An acetabular reaming drill handle, the acetabular reaming drill handle comprising: A hollow shaft having a plurality of shaft sections, wherein the plurality of shaft sections include: a distal shaft segment having a distal end and a proximal end; and an additional shaft segment having a distal end pivotally attached to the proximal end of the distal shaft segment to allow the additional shaft segment and the distal shaft segment to be adjustably oriented at an angle relative to each other; a hollow neck member having a longitudinal axis; a drive train extending through the shaft and the neck component, wherein a head component of the drive train is mounted for rotation about the longitudinal axis of the neck component and is connectable to an acetabular reamer, Wherein the distal end of the distal shaft section is pivotally attached to the proximal end of the neck component to allow the distal shaft section and the neck component to be adjustably oriented at an angle relative to each other.

2. The acetabular reamer handle according to claim 1, further comprising: a distally facing engagement surface at the distal end of the distal shaft segment; as well as a plurality of engagement surfaces at the proximal end of the neck component, wherein the neck component is pivotable relative to the distal shaft segment to present each of the plurality of engagement surfaces to the distally-facing engagement surface at the distal end of the distal shaft segment to orient the neck component and the distal shaft segment at respective angles relative to each other.

3. An acetabular reamer drill handle according to claim 2, wherein the distally facing engagement surface of the distal shaft segment is disposed on an engagement member, wherein the engagement member is elastically biased distally to push the distally facing engagement surface of the distal shaft segment against one of the plurality of engagement surfaces located at the proximal end of the neck component, thereby resisting relative movement between the neck component and the distal shaft segment.

4. An acetabular reamer drill handle according to claim 3, wherein the engagement member is capable of retracting proximally along the longitudinal axis of the distal shaft segment to disengage the distally facing engagement surface of the distal shaft segment from the engagement surface located at the proximal end of the neck component, thereby allowing the neck component to pivot freely relative to the distal shaft segment.

5. The acetabular reamer handle of claim 4, wherein the engagement member includes a gripping surface for allowing a surgeon to manually manipulate the engagement member.

6. The acetabular reamer handle of claim 3, wherein the engagement member is substantially tubular, and wherein the drive train passes through a center of the engagement member.

7. The acetabular reamer handle of claim 3, wherein the engagement member is configured as a sleeve on an outer surface of the distal shaft section.

8. The acetabular reamer handle of claim 2, wherein the distally facing engagement surface at the distal end of the distal shaft section is substantially annular.

9. The acetabular reamer handle of claim 2, wherein the distally facing engagement surface and each of the plurality of engagement surfaces at the proximal end of the neck component are substantially planar.

10. The acetabular reamer handle according to claim 1, further comprising: a distally facing engagement surface at the distal end of the additional shaft segment; as well as a plurality of engagement surfaces located at a proximal end of the distal shaft segment, wherein the distal shaft segment is pivotable relative to the additional shaft segment to present each of the plurality of engagement surfaces of the distal shaft segment to the distal-facing engagement surface located at the distal end of the additional shaft segment, thereby orienting the distal shaft segment and the additional shaft segment at corresponding angles relative to each other.

11. An acetabular reamer drill handle according to claim 10, wherein the distally facing engagement surface of the additional shaft segment is disposed on an engagement member, wherein the engagement member of the additional shaft segment is elastically biased distally to push the distally facing engagement surface of the additional shaft segment against one of the plurality of engagement surfaces located at the proximal end of the distal shaft segment, thereby resisting relative movement between the distal shaft segment and the additional shaft segment.

12. An acetabular reamer drill handle according to claim 11, wherein the engaging member of the additional shaft segment is capable of retracting proximally along the longitudinal axis of the additional shaft segment to disengage the distally facing engaging surface of the additional shaft segment from the engaging surface located at the proximal end of the distal shaft segment, thereby allowing the distal shaft segment to pivot freely relative to the additional shaft segment.

13. The acetabular reamer handle of claim 12, wherein the engagement member of the additional shaft section includes a gripping surface for allowing a surgeon to manually manipulate the engagement member of the additional shaft section.

14. The acetabular reamer handle of claim 11, wherein the engagement member of the additional shaft section is substantially tubular, and wherein the drive train passes through a center of the engagement member of the additional shaft section.

15. The acetabular reamer handle of claim 11, wherein the engagement member of the additional shaft segment is configured as a sleeve on an outer surface of the additional shaft segment.

16. The acetabular reamer handle of claim 10, wherein the distally facing engagement surface at the distal end of the additional shaft section is substantially annular.

17. The acetabular reamer handle of claim 10, wherein the distally facing engagement surface at the distal end of the additional shaft section and each of the plurality of engagement surfaces at the proximal end of the distal shaft section are substantially planar.

18. The acetabular reamer handle of claim 1, wherein the drive train comprises at least one of: a universal joint at a pivot point between the distal end of the distal shaft section and the proximal end of the neck component; and A universal joint is located at a pivot point between the distal end of the additional shaft section and the proximal end of the distal shaft section.

19. The acetabular reamer handle according to claim 1, wherein: The distal end of the additional shaft segment and the proximal end of the distal shaft segment are pivotally attached to allow the additional shaft segment and the distal shaft segment to be adjustably oriented at an angle relative to each other only in a first plane, and the distal end of the distal shaft segment is pivotally attached to the proximal end of the neck component to allow the distal shaft segment and the neck component to be adjustably oriented at an angle relative to each other only in the first plane.

20. The acetabular reamer handle of any one of claims 1 to 19, wherein the shaft comprises two shaft sections, and wherein the additional shaft section is a proximal shaft section of the shaft.

21. An acetabular reamer drill handle according to any one of claims 1 to 19, wherein the shaft comprises more than two shaft segments, wherein the additional shaft segments are intermediate shaft segments, and wherein the shaft comprises one or more further pivotally connected shaft segments arranged proximally of the intermediate shaft segments.

22. The acetabular reamer handle of claim 21, wherein the shaft comprises a plurality of shaft segments, the plurality of shaft segments comprising: said distal shaft segment; said additional shaft section forming a first intermediate shaft section of said shaft; a further shaft section forming a second intermediate shaft section, wherein a distal end of the second intermediate shaft section is pivotally attached to a proximal end of the first intermediate shaft section; and A further shaft section forms a proximal shaft section of the shaft, wherein a distal end of the proximal shaft section is pivotally attached to the proximal end of the second intermediate shaft section.

23. A surgical kit comprising an acetabular reamer handle according to any preceding claim and one or more acetabular reamer of different sizes connectable to the head component of the drive train of the acetabular reamer handle.

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