Device for dismantling implant systems

Abstract

A device for detaching a hard acetabular liner (e.g., metal, ceramic, etc.) positioned in an acetabular shell, the device including an elongated member having a proximal end and a distal end, and an engagement structure positioned on the proximal end of the elongated member, the engagement structure including a first portion having a curved outer surface, a first end face aligned substantially perpendicular to a longitudinal axis of the device, and an inner surface extending from the first end face, the first portion structured to fit at least partially into a scalloped recess on a peripheral top surface of the acetabular shell, the engagement structure further including a second portion separated from the first portion by an opening structured to receive the top surface of the acetabular liner and including an outer surface extending a second length from the proximal end of the elongated member that is structured to contact the top surface of the acetabular shell.

Description

[Technical field]

[0001] The present disclosure relates generally to disassembling a multi-component implant system and, more particularly, to a device and method for mechanically decoupling an acetabular liner that is coupled to a shell. [Background technology]

[0002] In implant systems, relatively sharp tools may be used to remove or modify the implant (e.g., to separate the acetabular liner that is connected to the acetabular cup). In some embodiments, the liner may comprise a material that is not extremely hard and may be damaged (e.g., a polyethylene liner). However, some configurations may present unique challenges, especially due to the configuration in which a universal tool cannot be used to separate the liner from the acetabular cup without damaging the liner. Also, some configurations of implant assemblies present unique challenges because the metal liner is sunk and taper-locked into the acetabular cup. Therefore, it would be advantageous to have a better tool that allows the liner to be separated from the acetabular cup without damaging the acetabular cup or the liner. Summary of the Invention [Means for solving the problem]

[0003] The devices, systems, and methods of the present disclosure have several features, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the invention as expressed by the claims that follow, certain innovations will now be briefly discussed. After considering this discussion, and the other sections provided herein, it will be understood how the features of embodiments of the disassembly tools and methods of using the disassembly tools of the present disclosure for separating hard bearing acetabular liners (e.g., metal, ceramic, etc.) that are coupled to a shell provide several advantages.

[0004] One innovation includes a disassembly device for separating an acetabular liner positioned within and coupled to a shell. The disassembly device can include an elongated member having distal and proximal ends and a longitudinal axis extending between the distal and proximal ends, and an engagement structure at the proximal end of the elongated member, the engagement structure having a frusto-conical outer surface and including a first portion and a second portion, the first portion and the second portion being separated by an opening defined in part by a curved inner surface having a distal portion. The first portion includes a curved outer surface extending a first length from the proximal end of the elongated member, a first end face substantially perpendicularly aligned with the longitudinal axis, and an inner surface extending from the first end face to the curved inner surface, the first portion being structured to at least partially fit into a scalloped recess on a peripheral top surface of the acetabular shell. The second portion includes a curved outer surface extending a second length from the proximal end of the elongate member, the second length being less than the first length, a second end face aligned substantially perpendicular to the longitudinal axis, and an inner surface aligned substantially perpendicular to the second face and extending from the second end face to the curved inner surface.

[0005] Various embodiments can include additional features. In some embodiments, the first portion is structured and sized to at least partially fit into a scalloped recess on the peripheral top surface of the acetabular shell. In some embodiments, the first end surface is hemispherically shaped. In some embodiments, the second end surface is hemispherically shaped. In some embodiments, the frusto-conical outer surface tapers inwardly at an angle A relative to the longitudinal axis as it extends away from the proximal end of the elongated member, the angle A being between about 0 degrees and about 20 degrees. In some embodiments, the angle A is between about 5 degrees and about 11 degrees. In some embodiments, the inner surface extends at an angle C, the angle C being between about 30 degrees and about 88 degrees. In some embodiments, the angle C is between about 50 degrees and about 80 degrees. In some embodiments, the first length is between about 4 mm and about 9 mm. In some embodiments, the first length is about 6 mm, plus or minus 1 mm. In some embodiments, the second length is between about 2 mm and about 7 mm. In some embodiments, the second length is about 3.5 mm, plus or minus 1 mm. In some embodiments, the curved inner surface is U-shaped. In some embodiments, the first end surface includes a straight edge and a curved edge, and the straight edge of the first end surface is between about 4.5 mm and about 6.6 mm in length. In some embodiments, the second end surface includes a straight edge and a curved edge, and the straight edge of the second end surface is between about 3 mm and about 5 mm in length. In some embodiments, the disassembly device further includes a handle positioned on a distal end of the elongated member. In some embodiments, the elongated member is a rod having a circular cross-sectional area. In some embodiments, the acetabular liner includes a metal. In some embodiments, the acetabular liner includes a ceramic.

[0006] Another innovation includes a disassembly device for separating a hard-bearing acetabular liner that is positioned within and coupled to the shell. The disassembly device includes an elongate member having distal and proximal ends and a longitudinal axis extending between the distal and proximal ends, and an engagement structure at the proximal end of the elongate member, the engagement structure including a first portion and a second portion separated by an opening, the first portion including a curved outer surface extending a first length from the proximal end of the elongate member and a first end face aligned substantially perpendicular to the longitudinal axis, the first portion being structured to fit at least partially into a scalloped recess on a peripheral upper surface of the acetabular shell, the second portion including an outer surface extending a second length from the proximal end of the elongate member and a second end face aligned substantially perpendicular to the longitudinal axis, the second portion being structured to contact the upper surface of the acetabular shell, and the opening separating the first and second portions including an inner surface extending from the first end face and the second end face to an inner surface. Additionally, the opening of the disassembly device is structured to receive the top surface of the acetabular liner, allowing a first portion of the device to be positioned within the inner surface of the liner with the second portion in contact with the top surface of the acetabular shell without contacting the liner. In various embodiments, the liner comprises a metal or a ceramic.

[0007] Another innovation is a method of separating a liner from an acetabular shell, the method including providing a disassembly tool, the disassembly tool including an elongated member having a distal end and a proximal end and a longitudinal axis extending between the distal end and the proximal end, and an engagement structure at the proximal end of the elongated member, the engagement structure including a first portion and a second portion separated by an opening, the first portion including a curved outer surface extending a first length from the proximal end of the elongated member and a first end face substantially aligned perpendicular to the longitudinal axis, the second portion including an outer surface extending a second length from the proximal end of the elongated member and a second end face substantially aligned perpendicular to the longitudinal axis, and the second portion including a curved outer surface extending a second length from the proximal end of the elongated member and a second end face substantially aligned perpendicular to the longitudinal axis. The device includes an engagement structure, the first and second portions being structured to contact an upper surface of the acetabular shell, and an opening separating the first and second portions, the opening being defined by an inner surface extending from a first end face and a second end face, and the method includes the steps of positioning an upper surface of an acetabular liner within the opening, with the first portion of the device positioned adjacent the inner surface of the liner and the second portion contacting the upper surface of the acetabular shell without contacting the liner, and providing a sudden force to a distal end of the elongated member in a direction along the longitudinal axis toward the proximal end to at least partially separate the shell from the liner.

[0008] Features and advantages of the devices and methods described herein will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. These drawings depict only some embodiments according to the disclosure and should not be considered as limiting its scope. In the drawings, like reference numerals or symbols typically identify like components unless the context dictates otherwise. In some instances, the drawings may not be drawn to scale. [Brief description of the drawings]

[0009] [Figure 1]1 illustrates two example disassembly instruments positioned to separate an acetabular liner from an acetabular cup, the acetabular liner being positioned inside the acetabular cup. The example disassembly instruments illustrated in this disclosure may be referred to herein as "disassembly instruments," "disassembly devices," or simply "instruments" or "devices" for ease of reference. [Diagram 2] 2 is a perspective view of the proximal ends of the first and second instruments shown in FIG. 1 positioned to separate the acetabular liner from the shell. FIG. [Figure 3A] FIG. 13 is an elevation view of an example disassembly tool, showing a left side elevation view of the tool. [Figure 3B] FIG. 1 is an elevational view of an example disassembly tool, showing a bottom side elevational view of the tool. [Figure 3C] FIG. 13 is an elevation view of an example disassembly tool, showing a right side elevation view of the tool. [Figure 3D] FIG. 1 is an elevational view of an example disassembly tool, showing a top elevational view of the tool. [Figure 4] FIG. 4 is an elevational view of the proximal end of the disassembly tool shown in FIGS. 1-3. [Diagram 5] FIG. 5 is a perspective view of the left proximal end of the disassembly tool shown in FIGS. 1-4. [Figure 6] FIG. 6 is an elevational view of the end of the proximal end of the disassembly tool shown in FIGS. 1-5. [Figure 7] FIG. 7 is a perspective view of the right proximal end of the disassembly tool shown in FIGS. 1-6. [Figure 8] FIG. 1 illustrates the proximal end of a disassembly tool engaged with a liner and a shell, with a first portion of the tool's engagement structure positioned inside the liner and a second portion of the tool's engagement structure positioned outside the liner with an end face of the second portion adjacent to the upper surface of the shell. [Figure 9]1 illustrates the proximal end of the disassembly tool engaged with the liner and shell, with a first portion of the tool's engagement structure positioned outside the liner in a recess in the shell with an inner surface of the first portion in contact with an outer surface of the liner and with an outer surface of the first portion in contact with the shell such that the disassembly tool can provide an impact / shock to the liner to separate it from the shell. In another example of use, the handle is moved downwards (with respect to the orientation of the figure) such that the first portion applies an upward force (with respect to the orientation of the figure) to disengage the liner from the shell. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The following detailed description is directed to certain embodiments of the invention. However, the invention can be embodied in many different ways. It should be apparent that aspects herein can be embodied in a wide variety of forms, and that any particular structure, function, or both disclosed herein is merely representative of one or more embodiments of the invention. Aspects disclosed herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, a device for disassembling an implant system including a liner from a shell, or a method for disassembling an implant system, can be practiced using any number of the aspects described herein. In addition, the disclosed devices can be implemented or such methods can be practiced using other structures, functionality, or structures and functionality in addition to or other than one or more of the aspects described herein.

[0011] Technology Overview Most implant systems provide a method to remove or modify the implant. Dual mobility implant assemblies present unique challenges as the metal liner is recessed and taper locked into the cup. There are limited features exposed in the liner to aid in removal, and the liner cannot be punctured (like poly liners). The disassembly tool disclosed is a unique feature tool that utilizes several features of the implant liner to facilitate separation of the liner from the shell to which it is connected.

[0012] Referring generally to the example removal tool 1 illustrated in FIGS. 1-9, in one use, the removal tool 1 can be used to remove the liner 2 from the shell 3 by providing a structure for impacting the shell 3, and shocking / vibrating the liner 2 to free it from the shell 3. The tool 1 includes an elongated member 11 having a proximal end 10 with an engagement structure 19 that is used to contact the liner 2 in the shell 3. The tool 1 also has a distal end 12 that includes a handle 15 (or a feature that allows for coupling to a handle), which is used as an impact part to provide a jarring force from the handle 15 through the elongated member 11 and through the engagement structure 19, which transfers the jarring force to the shell 3. Such force can be applied to the handle 15 by a user's hand or a tool (e.g., a hammer). The engagement structure 19 has a cut or slot (e.g., opening 13) that straddles the protruding rim of the liner 2, allowing the second portion 16 of the engagement structure 19 to firmly contact the shell 3. This provides an advantage because the slot keeps the removal tool positioned over the rim of the cup during impact, instead of bouncing off or skiving. Competitive systems may have some type of removal tool that impacts the face of the cup, but they do not have the engagement structure with the described first and second portions 14 and 16 with opening 13 therebetween that allows the engagement structure 19 to firmly engage the liner 2 or shell 3 and separate the liner 2 from the shell 3.

[0013] In a second aspect, the removal tool 1 can be used to impact the liner 2 and shock / vibrate the liner 2 to break free from the shell 3. In some embodiments, one side of the removal tool 1 (e.g., the first portion 14 of the engagement structure 19) is shaped to fit into one of the empty scallop cutouts 9 in the cup 3. In one example, the dual mobility implant liner can have six outward scalloped protrusions instead of twelve like the poly liner. In another example, the liner can have fewer scalloped protrusions than the scalloped recesses in the cup, meaning that some of the recesses will not be filled. In some examples, this means that there can be six scalloped cutouts in the cup 3 that will not be filled. The first portion 14 of the removal tool 1 is structured to fit into one of the empty scalloped recesses 9 of the shell 3 such that it has access to the side of the liner 2 (outer surface 4b) for impact. The shape, size, and configuration of embodiments of portions of engagement structure 19 are further described below with reference to Figures 1-9. In some embodiments, the liner and shell have one or more recesses and corresponding structures. In some embodiments, the recesses and structures have different shapes other than a scalloped shape.

[0014] Illustrative Examples of Devices for Assembling an Implant System Turning now to the figures, Figure 1 illustrates an example of two disassembly tools 1a and 1b positioned to separate an acetabular liner 2 from a shell 3, the acetabular liner 2 being positioned inside the shell 3. The liner 2 has an inner surface 4a, an outer surface 4b (Figure 2), and a peripheral top surface 6. The shell 3 has an outer surface 5, an inner surface (not shown), and a peripheral top surface 7. The outer surface 4b of the liner 2 is positioned adjacent to the inner surface of the shell 3 when the liner 2 is coupled to the shell 3.

[0015] Disassembly or removal tool ("tool") 1 has a proximal end 10 and a distal end 12. In this example, tools 1a and 1b include an elongate member 11 between the proximal end 10 and the distal end 12, an engagement structure 19 positioned on the proximal end 10, and a handle 15 positioned on the distal end 12. Elongate member 11 includes a top surface 34 and a bottom surface 32. Engagement structure 19 includes a first portion 14 and a second portion 16, which are illustrated in further detail in Figures 2 and 4-9.

[0016] FIG. 2 is a perspective view illustrating the proximal end 10 of two instruments 1a and 1b shown in FIG. 1, where the instruments 1a, 1b are positioned to separate the liner 2 from the shell 3. Although two instruments are shown and can be used together (e.g., by two different people), the instruments 1a and 1b are more often (or always) used one at a time. Thus, the diagram illustrating the two disassembly instruments can be thought of as illustrating two different instances of using the same instrument. Each of the instruments 1a, 1b has a longitudinal axis 17. The shell 3 includes a number of scallop-shaped recesses 9 positioned in the peripheral top surface 7 of the shell 3. In some embodiments, the recesses can be other shapes. The illustrated exemplary liner 2 includes two or more scallop-shaped protrusions 8 sized to fit into the recesses 9. Other metal liners can have zero protrusions.

[0017] The first portion 14 of the engagement structure 19 of the appliance 1a, shown on the right hand side of Figure 2, is positioned in the scalloped recess 9 of the shell 3, with the surface of the first portion 14 adjacent the outer surface 5 of the shell 3. An opening 13 in the engagement structure 19 separates the first portion 14 from the second portion 16. A second appliance 1b is shown on the left hand side of Figure 2, where the first portion 14 of the appliance 1b is positioned adjacent the inner surface 4a of the liner 2. The relative location of the appliance on the cup is not important, simply that it is in contact with the peripheral upper surface 7 of the cup 3. The second portion 16 of the appliance 1b is positioned adjacent the upper surface 7 of the shell 3. The engagement structure 19 is configured to allow the rim 62 of the liner 2 to extend into the opening 13 when the device 1b is positioned as shown, allowing the second end face 24 of the second portion 16 to contact the top surface 7 of the shell 3 while the first portion 14 extends into the opening 4a of the liner 2. Further details of the configuration of the engagement structure 19 are illustrated in Figures 4 and 5. The lateral length 52 (Figure 6) and height 53 (Figure 6) of the opening 13 are sized to allow the rim 62 of the liner 2 to extend into the opening 13 as illustrated in Figures 1 and 2.

[0018] 3A-3D illustrate four side elevations of an example of a disassembly tool 1. FIG. 3A illustrates a left side elevation of the disassembly tool 1. FIG. 3B illustrates a bottom side elevation of the disassembly tool 1. FIG. 3C illustrates a right side elevation of the disassembly tool 1. FIG. 3D illustrates a top elevation of the disassembly tool 1. In the embodiment illustrated herein, the elongated member 11 is cylindrical in shape and has a circular cross section. However, in other embodiments, the cross section of the elongated member 11 can be, for example, elliptical, square, rectangular, pentagonal, hexagonal, octagonal, or of any other shape.

[0019] 4 and 5, FIG. 4 illustrates a left side elevational view of the proximal end of the example disassembly tool 1 illustrated in FIGS. 1-3. FIG. 5 illustrates a left side perspective view of the proximal end 10 of the disassembly tool 1 illustrated in FIGS. 1-4. The engagement structure 19 extends from the distal end 60 of the engagement structure 19 to the proximal end 58. The engagement structure 19 includes a first portion 14 that extends a length 48 from the distal end 60 of the engagement structure to the first end surface 22. The first portion 14 includes a curved outer surface 44. In this example, the second portion 16 includes a curved outer surface 46. In some embodiments, the second portion does not necessarily include a curved surface, but instead has a different shape. In some embodiments, the second portion includes a curved surface for ease of manufacture and other reasons. In some embodiments, the length 48 of the first portion 14 is between about 4 mm and about 9 mm. In some embodiments, the length 48 of the first portion 14 is about 6 mm, plus or minus 1 mm. The engagement structure 19 also includes a second portion 16 that extends a length 50 from a distal end 60 of the engagement structure to the second end surface 24. In some embodiments, the second portion length 50 is between about 2 mm and about 6 mm. In some embodiments, the second portion length 50 is about 3.5 mm, plus or minus 1 mm.

[0020] In some preferred embodiments, the first end portion 14 includes a first tapered surface 18 such that the first portion 14 tapers inwardly as it extends from the distal end 60 to the first end face 22. In some embodiments, the first end portion 14 is not inwardly tapered, but instead extends in alignment with the angle of the surface of the elongate member 11. In some embodiments, the first portion 14 tapers inwardly at an angle A between about 0 degrees and about 20 degrees. For example, in some embodiments, the first portion 14 tapers inwardly at an angle A of 1 degree, 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, or 20 degrees, plus or minus 0.5 degrees. In some embodiments, the first portion 14 tapers inwardly at an angle A between about 5 degrees and about 11 degrees. In some embodiments, the first portion 14 tapers inwardly at an angle A between about 7 degrees and about 9 degrees.

[0021] In some embodiments (including some preferred embodiments), the second end portion 16 includes a second tapered surface 20 such that the second portion 16 tapers inwardly as it extends from the distal end 60 to the second end face 24. In some embodiments, the second end portion 16 is not inwardly tapered, but instead extends in alignment with the angle of the surface of the elongate member 11. In some embodiments, the second portion 16 tapers inwardly at an angle B between about 0 degrees and about 20 degrees. For example, in some embodiments, the second portion 16 tapers inwardly at an angle B of 1 degree, 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, or 20 degrees, plus or minus 0.5 degrees. In some embodiments, the second portion 16 tapers inwardly at an angle B between about 3 degrees and about 9 degrees. In some embodiments, the second portion 16 tapers inwardly at an angle B between about 6 degrees and about 8 degrees. In some embodiments, the second portion 16 has an outward "taper" such that the second portion 16 angles outwardly at an angle between about 0 degrees and about 20 degrees. For example, in some embodiments, the second portion 16 tapers outwardly at an angle of 1 degree, 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, or 20 degrees, plus or minus 0.5 degrees.

[0022] In some embodiments, the first end surface 22 extends from the outer edge 36 to the inner edge 38. In some embodiments, the first end surface 22 is aligned perpendicular or nearly perpendicular to the longitudinal axis 17. In some embodiments, the first portion 14 also includes an inner surface 45 that is angled inwardly from the inner edge 38 to the inner surface 27 at an angle C relative to the first surface 22, the inner surface 27 facing the opening 13. In some embodiments, the angle C is between 30 and 88 degrees. In some preferred embodiments, the angle C is between 50 and 80 degrees. For example, in some embodiments, angle C is 51 degrees, 52 degrees, 53 degrees, 54 degrees, 55 degrees, 56 degrees, 57 degrees, 58 degrees, 59 degrees, 60 degrees, 61 degrees, 62 degrees, 63 degrees, 64 degrees, 65 degrees, 66 degrees, 67 degrees, 68 degrees, 69 degrees, 70 degrees, 71 degrees, 72 degrees, 73 degrees, 74 degrees, 75 degrees, 76 degrees, 77 degrees, 78 degrees, 79 degrees, or 80 degrees, plus or minus 0.5 degrees. Inner surface 27 is curved (as shown) and can be bounded by edge 28. In some embodiments, edge 28 includes a chamfer 30 (e.g., a chamfered edge). In some embodiments, first portion 14 also includes an inner surface 45 that angles inwardly from inner edge 38 to a non-curved inner surface (e.g., rectangular (e.g., having one or more square corners or non-curved corners)) that faces opening 13. In such embodiments, edge 28 can include a chamfer 30 (e.g., a chamfered edge).

[0023] In some embodiments, the second end surface 24 extends from the outer edge 40 to the inner edge 42. In some embodiments, the second end surface 24 is aligned perpendicular or nearly perpendicular to the longitudinal axis 17. In some embodiments, the second portion 16 also includes an inner surface 47 that extends from the inner edge 42 to a curved inner surface 27. The curved inner surface 27 that extends onto the second portion 16 is bounded by an edge 28. In some embodiments, the edge 28 includes a chamfer 30 (e.g., a chamfered edge).

[0024] FIG. 6 illustrates an end elevation view of the proximal end 10 of the disassembly tool 1 illustrated in FIG. 5. In some embodiments, the first end surface 22 extends to a width 54 between about 1 mm and about 6 mm. For example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, plus or minus 0.5 mm. In some embodiments, the second end surface 24 extends to a width 56 between about 1 mm and about 10 mm. For example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, plus or minus 0.5 mm. The opening 13 extends laterally across the acetabulum engaging structure 19 and has a lateral length dimension 52. The opening 13 has a height dimension 53 that extends from the inner surface 47 of the first portion 14 to the inner surface 47 of the second portion 16. The height dimension 53 is greater than the thickness of the rim 62 of the liner 2 to allow the curved liner rim 62 to extend into the opening 13. In some embodiments, the height dimension 53 is between 2 mm and 30 mm. For example, the height dimension can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, or 30 mm, plus or minus 0.5 mm, or between any two of them. In some embodiments, the height dimension 52 is between 5 mm and 15 mm. For example, the height dimension can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, plus or minus 0.5 mm, or between any two thereof. In some embodiments, the lateral length dimension 52 is between 10 mm and 90 mm. In some embodiments, the lateral length dimension 52 is between 30 mm and 70 mm.For example, the horizontal length dimensions are: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, It can be 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm, 82mm, 83mm, 84mm, 85mm, 86mm, 87mm, 88mm, 89mm, or 90mm, plus or minus 0.5mm, or it can be between any two of them.

[0025] FIG. 7 further illustrates the proximal end of the instrument 1, showing a perspective view of the right proximal end of the embodiment of the engagement structure 19 shown in FIGS.

[0026] 8 and 9 further illustrate an engagement structure 19 engaged with the liner 2 and the shell 3 to separate the liner 2 from the shell 3. In FIG. 8, a first portion 14 of the engagement structure 19 is positioned within an interior portion of the liner 2. As illustrated in FIG. 8, the top surface 6 of the liner 2 extends into the opening 13. A second portion 16 of the engagement structure 19 is positioned in contact with the exterior of the shell 3, and a second end face 24 of the second portion 16 is positioned adjacent to and in contact with the top surface 7 of the shell, allowing a force illustrated by dashed arrow G (e.g., a downward force relative to the orientation of FIG. 8) to be applied to the shell 3 without applying a downward force to the liner 2.

[0027] 9 illustrates the engagement structure 19 of the disassembly tool 1 engaged with the liner 2 and the shell 3. The first portion 14 of the engagement structure 19 is positioned outside the liner 2 in the recess 9 of the shell 3 with the inner surface 45 and / or the first end face 22 in contact with the outer surface of the liner 2 and with the outer surface 44 of the first portion 14 in contact with the shell 3. In this arrangement, the distal end 12 of the tool 1 can be used to apply a force (illustrated by dashed arrow H) to the liner 2 (e.g., by applying an impact force to the distal end (e.g., handle 15) of the tool 1) to separate the liner 2 from the shell 3. Also, a downward force F (with respect to the orientation of the figure) can be applied to the distal end 12 of the tool 1 such that the first portion 14 applies an upward force (with respect to the orientation of the figure) illustrated by dashed arrow I to disengage the liner 2 from the shell 3.

[0028] Example of a device for disassembling an implant system Some (but not all) examples of embodiments of devices for disassembling implant systems are listed below.

[0029] Embodiment 1: A disassembly device for separating a hard-bearing acetabular liner positioned within and coupled to a shell, the disassembly device comprising: an elongated member having a distal end and a proximal end and a longitudinal axis extending between the distal end and the proximal end; and an engagement structure at the proximal end of the elongated member, the engagement structure having a frusto-conical outer surface, the engagement structure including a first portion and a second portion, the first portion and the second portion being separated by an opening defined in part by a curved inner surface having a distal portion, the first portion having a curved inner surface extending a first length from the proximal end of the elongated member. 1. A disassembly device comprising: an outer surface, a first end face aligned substantially perpendicular to the longitudinal axis, and an inner surface extending from the first end face to a curved inner surface, the first portion being structured to fit at least partially into a scalloped recess on a peripheral upper surface of an acetabular shell, and a second portion being a curved outer surface extending from a proximal end of the elongated member a second length, the second length being less than the first length.

[0030] Embodiment 2: The disassembly device of embodiment 1, wherein the first portion is structured and sized to fit at least partially into a scallop-shaped recess on the peripheral upper surface of the acetabular shell.

[0031] Embodiment 3: The disassembly device of embodiment 1 or 2, wherein the first end surface is hemispherical in shape.

[0032] Embodiment 4: The disassembly device of any one of embodiments 1 to 3, wherein the second end surface is hemispherical in shape.

[0033] Embodiment 5: A disassembly device as described in any one of embodiments 1 to 4, wherein the frusto-conical outer surface tapers inwardly at an angle A relative to the longitudinal axis as it extends away from the proximal end of the elongate member, angle A being between about 0 degrees and about 20 degrees.

[0034] Embodiment 6: The disassembly device of embodiment 5, wherein angle A is between about 5 degrees and about 11 degrees.

[0035] Embodiment 7: The disassembly device of any one of embodiments 1 to 6, wherein the inner surface extends at an angle C, the angle C being between about 30 degrees and about 88 degrees.

[0036] Embodiment 8: The disassembly device of embodiment 7, wherein angle C is between about 50 degrees and about 80 degrees.

[0037] Embodiment 9: The disintegration device of any one of embodiments 1 to 8, wherein the first length is between about 4 mm and about 9 mm.

[0038] Embodiment 10: The disintegration device of any one of embodiments 1 to 9, wherein the first length is about 6 mm, plus or minus 1 mm.

[0039] Embodiment 11: The disintegration device of any one of embodiments 1 to 10, wherein the second length is between about 2 mm and about 7 mm.

[0040] Embodiment 12: The disintegration device of any one of embodiments 1 to 11, wherein the second length is about 3.5 mm, plus or minus 1 mm.

[0041] Embodiment 13: The disassembly device of any one of embodiments 1 to 12, wherein the curved inner surface is U-shaped.

[0042] Embodiment 14: The disassembly device of embodiment 3, wherein the first end surface includes a straight edge and a curved edge, and the straight edge of the first end surface is between about 4.5 mm and about 6.6 mm in length.

[0043] Embodiment 15: The disassembly device of embodiment 4, wherein the second end surface includes a straight edge and a curved edge, and the straight edge of the second end surface is between about 3 mm and about 5 mm in length.

[0044] Embodiment 16: The disassembly device of any one of embodiments 1 to 15, further comprising a handle positioned on a distal end of the elongate member.

[0045] Embodiment 17: The disassembly device of embodiment 1, wherein the elongated member is a rod having a circular cross-sectional area.

[0046] Embodiment 18: The disintegration device of embodiment 1, wherein the acetabular liner comprises metal.

[0047] Embodiment 19: The disintegration device of embodiment 1, wherein the acetabular liner comprises a ceramic.

[0048] Embodiment 20: A disassembly device for separating a hard-bearing acetabular liner positioned within and coupled to a shell, the disassembly device comprising: an elongated member having distal and proximal ends and a longitudinal axis extending between the distal and proximal ends; and an engagement structure at the proximal end of the elongated member, the engagement structure including a first portion and a second portion separated by an opening, the first portion including a curved outer surface extending a first length from the proximal end of the elongated member and a first end face aligned substantially perpendicular to the longitudinal axis, the first portion being adapted to be fitted at least partially into a scalloped recess on a peripheral upper surface of the acetabular shell. a second portion including an outer surface extending a second length from a proximal end of the elongated member and a second end face aligned substantially perpendicular to the longitudinal axis, the second portion being structured to contact an upper surface of an acetabular shell, an opening separating the first and second portions including an inner surface extending from the first and second end faces to an inner surface, the opening being structured to receive an upper surface of an acetabular liner, allowing the first portion of the device to be positioned within the inner surface of the liner with the second portion in contact with the upper surface of the acetabular shell without contacting the liner.

[0049] Embodiment 21: The disintegration device of embodiment 20, wherein the liner comprises a metal or a ceramic.

[0050] Embodiment 22: A method of separating a liner from an acetabular shell, the method comprising the steps of providing a disassembly tool, the disassembly tool comprising: an elongated member having a distal end and a proximal end and a longitudinal axis extending between the distal end and the proximal end; and an engagement structure at the proximal end of the elongated member, the engagement structure comprising a first portion and a second portion separated by an opening, the first portion comprising a curved outer surface extending a first length from the proximal end of the elongated member and a first end face substantially aligned perpendicular to the longitudinal axis, the second portion comprising an outer surface extending a second length from the proximal end of the elongated member and a second end face substantially aligned perpendicular to the longitudinal axis, the second portion comprising a curved outer surface extending a second length from the proximal end of the elongated member and a second end face substantially aligned perpendicular to the longitudinal axis, the portion includes an engagement structure structured to contact an upper surface of the acetabular shell and an opening separating the first and second portions, the opening being defined by an inner surface extending from a first end face and a second end face, and the method includes the steps of positioning an upper surface of the acetabular liner in the opening with the first portion of the device positioned adjacent the inner surface of the liner and the second portion contacting the upper surface of the acetabular shell without contacting the liner, and providing a sudden force to the distal end of the elongated member in the direction of the proximal end along the longitudinal axis to at least partially separate the shell from the liner.

[0051] Implementation Considerations The foregoing description details certain embodiments of the systems, devices, and methods disclosed herein. However, no matter how detailed the foregoing appears in the text, it will be recognized that the systems, devices, and methods can be practiced in many ways. It should also be noted that the use of specific terminology in describing certain features or aspects of the present invention, as described above, should not be construed as implying that the terminology is being redefined herein to be limited to include any particular characteristic of the feature or aspect of the technology with which it is associated.

[0052] Conditional language such as "can," "could," "might," or "may," among others, is understood in context as being generally used to convey that certain embodiments include certain features, elements, and / or steps, while other embodiments do not, unless specifically stated otherwise. Thus, such conditional language is not generally intended to imply that features, elements, and / or steps are required in any manner by one or more embodiments, or that one or more embodiments necessarily include logic for determining whether those features, elements, and / or steps will be included or performed in any particular embodiment, with or without user input or prompting.

[0053] Headings are included herein for reference and to aid in locating the various sections. These headings are not intended to limit the scope of the concepts described in connection therewith. Such concepts may have applicability throughout the entire specification.

[0054] Many variations and modifications can be made to the above-described embodiments, and the elements thereof should be understood as being among other acceptable examples. All such modifications and modifications are intended to be included herein within the scope of the present disclosure. The foregoing description details certain embodiments. However, no matter how detailed the foregoing appears in the text, it will be recognized that the systems and methods can be practiced in many ways. It should also be noted that the use of specific terminology in describing certain features or aspects of the systems and methods, as described above, should not be construed as implying that the terminology is being redefined herein to be limited to include any particular characteristic of the feature or aspect of the systems and methods with which the terminology is associated.

[0055] It will also be understood that when a feature or element (e.g., a structural feature or element) is referred to as being "connected," "attached," or "coupled" to another feature or element, it may be directly connected, attached, or coupled to the other feature or element, or there may be intervening features or elements present. In contrast, when a feature or element is referred to as being "directly connected," "directly attached," or "directly coupled" to another feature or element, there may not be intervening features or elements present. Although described or illustrated with respect to one embodiment, features and elements so described or illustrated may be applicable to other embodiments. It will also be recognized by those skilled in the art that references to a structure or feature being disposed "adjacent" to another feature may have overlapping or underlying portions with the adjacent feature.

[0056] The terminology used herein is for the purpose of describing particular embodiments and implementations only and is not intended to be limiting. For example, as used herein, the singular forms "a," "an," and "the" may be intended to include the plural forms as well, unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and / or "comprising," as used herein, specify the presence of stated features, steps, operations, processes, functions, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, processes, functions, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items and can be abbreviated as " / ."

[0057] In the above description and in the claims, phrases such as "at least one of" or "one or more of" may appear followed by a conjunctive list of elements or features. Also, the term "and / or" may appear in a list of two or more elements or features. Unless otherwise contradicted, implicitly or explicitly by the context in which it is used, such phrases are intended to mean any of the listed elements or features individually, or any of the described elements or features in combination with any of the other described elements or features. For example, the phrases "at least one of A and B"; "one or more of A and B"; and "A and / or B" are each intended to mean "A alone, B alone, or A and B together." A similar interpretation is also intended with respect to lists containing more than two items. For example, the phrases "at least one of A, B, and C"; "one or more of A, B, and C"; and "A, B, and / or C" are each intended to mean "A alone, B alone, C alone, A and B together, A and C together, B and C together, or A and B and C together." Use of the term "based on" above and in the claims is intended to mean "based at least in part on," allowing for unrecited features or elements to be permissible.

[0058] Spatially relative terms such as "front," "back," "lower," "below," "lower," "upper," and "top" may be used herein to describe the relationship of one element or feature to another element or feature as depicted in the figures for ease of description. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as being "under" or "beneath" other elements or features will be oriented "above" the other elements or features due to the inverted condition. Thus, the term "lower" may encompass both an upper and lower orientation, depending on the reference point or orientation. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly. Similarly, terms such as "upward," "downward," "vertical," and "horizontal" may be used herein for descriptive purposes only, unless specifically indicated otherwise.

[0059] As used in this specification and claims, including when used in the examples, and unless expressly specified otherwise, all numbers can be read as if they are preceded by the word "about" or "approximately" (even if that term does not appear explicitly). The phrase "about" or "approximately" can be used when describing a size and / or location to indicate that the described value and / or location is within a reasonably expected range of values ​​and / or locations. For example, a numerical value indicated to be "about" can have a value that is + / -0.1% of the stated value (or range of values), + / -1% of the stated value (or range of values), + / -2% of the stated value (or range of values), + / -5% of the stated value (or range of values), + / -10% of the stated value (or range of values), etc. Also, any numerical value given herein should be understood to include about or approximately that value unless the context dictates otherwise.

[0060] For example, if the value "10" is disclosed, then "about 10" is also disclosed. Any numerical range described herein is intended to include all subranges subsumed therein. It is also understood that when a value is disclosed, "less than or equal to" that value, "greater than or equal to" that value, and possible ranges between those values ​​are also disclosed as would be appropriately understood by one of ordinary skill in the art. For example, if a value "X" is disclosed, then "less than or equal to" and "greater than or equal to" X (e.g., where X is a numeric value) are also disclosed. It is also understood that throughout this application, data is provided in a number of different formats, and that this data can represent endpoints or starting points and ranges for any combination of the data points. For example, if a specific data point "10" and a specific data point "15" may be disclosed, it is understood that not only between 10 and 15, but also greater than, greater than or equal to, less than, less than or equal to, and equal to 10 and 15 can be considered disclosed. It is also understood that each unit between two specific units can be disclosed. For example, if 10 and 15 can be disclosed, then 11, 12, 13, and 14 can also be disclosed.

[0061] Although various illustrative embodiments have been disclosed, any of a number of modifications can be made to the various embodiments without departing from the teachings herein. For example, the order in which the various described method steps are performed can be changed or rearranged in different or alternative embodiments, and in other embodiments, one or more method steps can be skipped entirely. Optional or desirable features of various device and system embodiments may be included in some embodiments and not in other embodiments. Thus, the foregoing description has been provided primarily for illustrative purposes and should not be construed as limiting the scope of the claims and the particular embodiments or the specific details or features disclosed.

[0062] The examples and illustrations contained herein are for illustration, not for limitation, and show specific embodiments in which the disclosed subject matter may be practiced. As stated, other embodiments can be utilized and derived therefrom, such that structural and logical substitutions and changes can be made without departing from the scope of the present disclosure. Such embodiments of the disclosed subject matter may be individually or collectively referred to herein by the term "invention" merely for convenience and without any intention of spontaneously limiting the scope of this application to any single invention or inventive concept (where more than one is actually disclosed). Thus, while specific embodiments have been illustrated and described herein, any arrangement intended, practical, or calculated to achieve the disclosed purpose, whether expressly described or implied, may be substituted for the specific embodiments shown. The present disclosure is intended to cover any and all adaptations or variations of the various embodiments. Combinations of the above embodiments, as well as other embodiments not specifically described herein, will become apparent to those skilled in the art upon reviewing the above description.

[0063] The disclosed subject matter has been provided herein with reference to one or more features or embodiments. Regardless of the detailed nature of the exemplary embodiments provided herein, those skilled in the art will recognize and appreciate that variations and modifications can be applied to said embodiments without limiting or departing from the generally intended scope. These and various other adaptations and combinations of the embodiments provided herein are within the scope of the disclosed subject matter as defined by the complete set of disclosed elements and features and their equivalents.

[0064] Below is a list of certain annotations and components that are described and listed in this disclosure with reference to the figures listed above. However, any aspect, structure, feature, or operational function of the device illustrated in the figures, whether or not separately named herein, may form part of various embodiments of the present invention and may provide a basis for one or more claim limitations relating to such aspect, with or without additional description. The annotations and listed components include the following: [Explanation of symbols]

[0065] 1 Disassembly tools 2 Acetabular Liner ("Liner") 3 Acetabular shell ("shell" or "cup") 4a Inner surface of liner 4b Outer surface of the liner 5. Outer surface of cup 6 Peripheral (top) surface of the liner 7. Cup peripheral (top) surface 8 Scalloped protrusions on the liner 9 Scalloped recesses in cups 10 Proximal end 11 Long and thin members 12 Distal end 13 Opening 14 First Part 15 Handle 16 Second Part 17 Longitudinal axis 18 First Tapered Surface 19 Acetabular Liner Engagement Structure ("Engagement Structure") 20 Second Tapered Surface 21 Liner opening 22 First end face 24 Second End Face 27 Inner surface 28 Edge 30 Chamfered part 32 Bottom surface 34 Upper surface 36 Outer edge portion, first end face 38 Inner edge portion, first end face 40 Outer edge portion, second end face 42 Inner edge portion, second end face 44 Outer surface, first portion 45 Inner surface, first portion 46 Outer surface, second part 47 Inner surface, second part 48 Length 1st Part 50 Length Second Part 52 Horizontal length of opening 53 Opening width 54 Width of the first part 56 Width of second part 58 Proximal end of engagement structure 60 Distal end of engagement structure 62 Liner Rim

Claims

1. 1. A disassembly device for separating a hard-bearing acetabular liner positioned within and coupled to a shell, said disassembly device comprising: an elongate member having a distal end and a proximal end and a longitudinal axis extending between the distal end and the proximal end; an engagement structure at the proximal end of the elongate member, the engagement structure having a frusto-conical outer surface, the engagement structure including a first portion and a second portion, the first portion and the second portion being separated by an opening defined in part by a curved inner surface having a distal portion; Including, The first portion is a curved outer surface extending a first length from the proximal end of the elongate member; a first end surface aligned substantially perpendicular to the longitudinal axis; an inner surface extending from the first end surface to the curved inner surface, the first portion being structured to fit at least partially into a scalloped recess on a peripheral top surface of the acetabular shell; Including, The second portion is a curved outer surface extending a second length from the proximal end of the elongate member, the second length being less than the first length; a second end surface aligned substantially perpendicular to the longitudinal axis; and an inner surface substantially perpendicularly aligned with the second face and extending from the second end face to the curved inner surface; Including, disassembly device.

2. The disassembly device of claim 1 , wherein the first portion is structured and sized to fit at least partially into a scalloped recess on a peripheral top surface of the acetabular shell.

3. The disassembly device of claim 1 , wherein the first end surface is hemispherical in shape.

4. The disassembly device of claim 3 , wherein the first end surface includes a straight edge and a curved edge.

5. 4. The disassembly device of claim 3, wherein the first end surface includes a straight edge and a curved edge, the straight edge of the first end surface being between about 4.5 mm and about 6.6 mm in length.

6. The disassembly device of claim 1 , wherein the second end surface is hemispherical in shape.

7. 7. The disassembly device of claim 6, wherein the second end surface includes a straight edge and a curved edge, the straight edge of the second end surface being between about 3 mm and about 5 mm in length.

8. 2. The disassembly device of claim 1, wherein the frusto-conical outer surface tapers inwardly at an angle A relative to the longitudinal axis as it extends away from the proximal end of the elongate member, angle A being between about 0 degrees and about 20 degrees.

9. 9. The disassembly device of claim 8, wherein angle A is between about 5 degrees and about 11 degrees.

10. 2. The disassembly device of claim 1, wherein the inner surface extends at an angle C, the angle C being between about 30 degrees and about 88 degrees.

11. 11. The disassembly device of claim 10, wherein angle C is between about 50 degrees and about 80 degrees.

12. 10. The disintegration device of claim 1, wherein the first length is between about 4 mm and about 9 mm.

13. 2. The disassembly device of claim 1, wherein the first length is about 6 mm, plus or minus 1 mm.

14. 10. The disassembly device of claim 1, wherein the second length is between about 2 mm and about 7 mm.

15. 2. The disassembly device of claim 1, wherein the second length is about 3.5 mm, plus or minus 1 mm.

16. The disassembly device of claim 1 , wherein the curved inner surface is U-shaped.

17. The disassembly device of claim 1 , wherein the acetabular liner comprises a metal or a ceramic.

18. 1. A disassembly device for separating a hard-bearing acetabular liner positioned within and coupled to a shell, said disassembly device comprising: an elongate member having a distal end and a proximal end and a longitudinal axis extending between the distal end and the proximal end; an engagement structure at the proximal end of the elongate member, the engagement structure including a first portion and a second portion separated by an opening; Including, The first portion is a curved outer surface extending a first length from the proximal end of the elongate member; a first end surface aligned substantially perpendicular to the longitudinal axis; Including, the first portion is structured to fit at least partially into a scalloped recess on a peripheral top surface of the acetabular shell; The second portion is an outer surface extending a second length from the proximal end of the elongate member; a second end surface aligned substantially perpendicular to the longitudinal axis; and Including, the second portion is structured to contact the upper surface of the acetabular shell; The opening separating the first and second portions comprises: an inner surface extending from a first end surface and a second end surface to the inner surface; A disassembly device, wherein the opening is structured to receive the upper surface of the acetabular liner, allowing the first portion of the device to be positioned within the inner surface of the liner with the second portion in contact with the upper surface of the acetabular shell without contacting the liner.

19. 20. The disassembly device of claim 18, wherein the liner comprises a metal or a ceramic.

20. 1. A method for separating a liner from an acetabular shell, the method comprising: Providing a disassembly tool; The disassembly tool includes: an elongate member having a distal end and a proximal end and a longitudinal axis extending between the distal end and the proximal end; an engagement structure at the proximal end of the elongated member, the engagement structure including a first portion and a second portion separated by an opening, the first portion including a curved outer surface extending a first length from the proximal end of the elongated member and a first end face substantially aligned perpendicular to the longitudinal axis, and the second portion including an outer surface extending a second length from the proximal end of the elongated member and a second end face substantially aligned perpendicular to the longitudinal axis, the second portion being structured to contact the top surface of the acetabular shell; an opening separating the first and second portions, the opening being defined by an inner surface extending from a first end surface and a second end surface; Including, The method further comprises: positioning the top surface of the acetabular liner within the opening with the first portion of the device positioned adjacent an inner surface of the liner and with the second portion contacting the top surface of the acetabular shell without contacting the liner; providing a sudden force to the distal end of the elongate member along the longitudinal axis toward the proximal end to at least partially separate the shell from the liner; A method comprising:

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