as) United States
`a2) Patent Application Publication co) Pub. No.: US 2018/0193074 Al
`Hopkins
`(43) Pub. Date:
`Jul. 12, 2018
`
`
`US 20180193074A1
`
`(54) POLY-AXIAL FIXATION POSTS
`,
`(71) Applicant: Zimmer, Inc., Warsaw, IN (US)
`
`(52) U.S. Cl.
`CPC A61B 17/8605 (2013.01); A6IF 2002/30919
`(2013.01); A6LF 2/4081 (2013.01)
`
`(72)
`
`Inventor: Andrew Rolfe Hopkins, Winterthur
`(CH)
`
`(21) Appl. No.: 15/862,931
`.
`Filed:
`
`Jan. 5, 2018
`
`(22)
`
`.
`Related U.S. Application Data
`(60) Provisional application No. 62/444,148,filed on Jan.
`9, 2017.
`
`.
`:
`eas
`Publication Classification
`
`(St)
`
`Int. Cl.
`AGIB 17/86
`AGOIF 2/40
`
`(2006.01)
`(2006.01)
`
`ABSTRACT
`(57)
`This disclosure includes apparatus and methods to attach an
`orthopedic device to a bone. The method can comprise
`locating a baseplate on a glenoid ofa patient, the base plate
`including at least a first fastener bore, creating a first post
`holein the glenoid for locating a first fixation post, the first
`fixation post including a quasi-spherical head and a porous
`metal sleeve, and driving thefirst fixation post through the
`first fastener bore and into the first post hole. The porous
`metal sleeve can engage the first post hole and the quasi-
`spherical head can contact at least the first wall of the first
`fastener bore to removeablylock the quasi-spherical head to
`the baseplate. Driving the first fixation post can creale an
`initial compression between the baseplate and the glenoid.
`The porous metal sleeve can receive bone ingrowth to
`maintain the initial compression.
`
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`CATALYST, EX-1019
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`Jul. 12,2018 Sheet 1 of 7
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`Patent Application Publication
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`Jul. 12,2018 Sheet 2 of 7
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`US 2018/0193074 Al
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`Patent Application Publication
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`Jul. 12,2018 Sheet 3 of 7
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`US 2018/0193074 Al
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`Patent Application Publication
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`Jul. 12,2018 Sheet 4 of 7
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`US 2018/0193074 Al
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`Patent Application Publication
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`Jul. 12,2018 Sheet 5 of 7
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`US 2018/0193074 Al
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`CATALYST, EX-1019
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`Patent Application Publication
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`Jul. 12,2018 Sheet 6 of 7
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`US 2018/0193074 Al
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`
`
`FIG. 6
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`LOCATE A BASE PLATE ON A GLENOID OF A PATIENT, THE BASE PLATE INCLUDING
`AT LEASTA FIRST FASTENER BORE EXTENDING THROUGH THE BASE PLATE
`
`COMPRESSURE BETWEEN THE BASE PLATE AND THE GLENOID
`
`CREATE, BY PASSING THROUGH THE FIRST FASTENER BORE,A FIRST POST HOLE IN
`THE GLENOID FOR LOCATING A FIRST FIXATION POST WITHIN THE GLENOID, WHEREIN
`THE FIRST FIXATION POST INCLUDES A QUASI-SPHERICAL HEAD WITH A SHAFT
`EXTENDING THEREFROM TO A DISTAL SHAFT END OF THEFIRST FIXATION POST, THE
`QUASI-SPHERICAL HEAD INCLUDING A TEXTURED OUTER SURFACE FOR CONTACTING
`AT LEAST A FIRST WALL OF THE FIRST FASTENER BORE, THE FIRST FIXATION POST
`ALSO INCLUDING A POROUS METAL SLEEVE RECEIVED ON THE SHAFT
`
`DRIVING THE DISTAL END OF THE FIRST FIXATION POST THROUGH THE FIRST
`FASTENER BORE AND INTO THE FIRST POST HOLE SUCH THAT AN OUTER SURFACE
`OF THE POROUS METAL SLEEVE ENGAGES A SURFACE OF THE FIRST POST HOLE AND
`SUCH THAT THE TEXTURED OUTER SURFACE OF THE QUASI-SPHERICAL HEAD
`CONTACTS AT LEAST THE FIRST WALL OF THE FIRST FASTENER BORE SO AS TO
`REMOVEABLY LOCK THE QUASI-SPHERICAL HEAD TO THE BASE PLATE, WHEREIN SAID
`DRIVING CREATESAN INITIAL COMPRESSION BETWEEN THE BASE PLATE AND THE
`GLENOID, AND WHEREIN THE POROUS METAL SLEEVE IS CONFIGURED TO RECEIVE
`BONE INGROWTH INTO THE POROUS METAL SLEEVE FOR MAINTAININGSAID INITIAL
`
`FIG. 7
`
`CATALYST, EX-1019
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`US 2018/0193074 Al
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`Jul. 12, 2018
`
`POLY-AXTAL FIXATION POSTS
`
`CLAIM OF PRIORITY
`
`[0001] This patent application claims the benefit of prior-
`ity under 35 U.S.C. Section 119(e),
`to ANDREW HOP-
`KINS,U.S. patent application Ser. No. 62/444,148, entitled
`“POLY-AXIAL FIXATION POSTS.”filed on Jan. 9, 2017
`(Attorney Docket No. 4394.J33PRV), which is hereby incor-
`porated by reference herein inits entirety.
`TECIINICAL FIELD
`
`[0002] The present disclosure relates generally to medical
`technology and in cerlain aspects to methods and systems
`for adjustably connecting a first orthopedic component to a
`second orthopedic component, c.g. a post to a glenoid
`baseplate.
`
`BACKGROUND
`
`[0003] Many orthopedic devices use screws to allach an
`implant (e.g., a plate) to bone. Implanted. screws can relax,
`or otherwise release an initial compression between the
`implant and the bone, such that the screws can be limited to
`conferring, a structural support role rather than maintaining
`implant compression.
`
`nation with a tool apply ingrotary motion to the drill bit to
`remove bone material fromthefirst post hole.
`[0008] Example 4 can include, or can optionally be com-
`bined with the subject matter of Examples 1-3 to optionally
`include, drilling a first post hole using a chisel tool
`in
`combination with a tool applying linear motion to the chisel
`toal to remove bone material from the first post hole.
`[0009] Lxample 5 can include, or can optionally be com-
`bined with the subject matter of Examples 1-4 to optionally
`include, contacting at least the first wall of thefirst fastener
`bore with the textured outer surface of the quasi-spherical
`head by positioning at least a portion of a face ofthe textured
`outer surface of the quasi-spherical head against at least the
`first wall of the first fastener bore.
`[0010] Example 6 can include, or can optionally be com-
`bined with the subject matter of Examples 1-5 to optionally
`include, driving the distal end of the first fixation post by
`applying an impact loading force to the quasi-spherical head
`of the first fixation post.
`[0011] Example 7 can include, or can optionally be com-
`bined with the subject matter of Examples 1-6 to optionally
`include, driving the distal end of the first fixation post by
`applying a press loading force to the quasi-spherical head of
`the first fixation post.
`[0012] Example 8 caninclude, or can optionally be com-
`bined with the subject matter of Examples 1-7 to optionally
`include, creating by passing through a secondfastener bore,
`a second post hole in the glenoid for locating a second
`in certain
`[0004] The present disclosure provides,
`fixation post within the glenoid, wherein the secondfixation
`examples described below, unique methods and systems for
`
`post includes a quasi-spherical head with a shaft extending
`integrating or connecting orthopedic components. Each of
`therefrom to a distal end of the second fixation post, the
`these non-limiting examples can stand on its own or can be
`quasi-spherical head including a textured outer surface for
`combined in various permutations or combinations with any
`contacting at least a first wall of the second fastener bore, the
`one or more of the other examples.
`second fixation post also including a porous metal sleeve
`[0005] Example 1 can include or use subject matter, such
`received on the shaft, and driving the distal end of the second
`as a method, including a method ofattaching an orthopedic
`fixation post through the second fastener bore and into the
`device to a bone. The subject matter can comprise a method
`second post hole such that an outer surface of the porous
`comprising locating a baseplate on a glenoid ofapatient,the
`metal sleeve engages a surface of the second post hole and
`baseplate including at least a first fastener bore extending
`such that the textured outer surface of the quasi-spherical
`hrough the baseplate, creating by passing through thefirst
`head engages at least the first wall of the second fastener
`astener bore, a first post hole in the glenoid for locating a
`bore so as to removeably lock the quasi-spherical head to the
`first fixation post within the glenoid, wherein the first
`baseplate. wherein said driving creates an initial compres-
`fixation post mcludes a quasi-spherical head with a shaft
`sion between the baseplate and the glenoid, wherein the
`extending therefromto a distal end of the first fixation post,
`porous metal sleeve is configured to receive bone ingrowth
`he quasi-spherical head including a textured outer surface
`into the porous metal sleeve for maintaining said initial
`or contacting at least a first wall of the first fastener bore.
`compression between the baseplate and the glenoid.
`he first fixation post also including a porous metal sleeve
`[0013] Example 9 can include, or can optionally be com-
`received on the shaft, and driving the distal end of the first
`bined with the subject matter of Examples 1-8 to optionally
`fixation post through thefirst fastener bore and into thefirst
`include, a secondfixation post that is aligned independently
`post hole such that an outer surface of the porous metal
`from the first fixation post.
`sleeve engages a surface ofthe first post hole and such that
`[0014] Example 10 can include, or can optionally be
`he textured outer surface of the quasi-spherical head con-
`acts at least the first wall of the first fastener bore so as to
`combined with the subject matter of Fxamples 1-9 to
`optionally include, engaging at least the first wall of the
`removeably lock the quasi-spherical head to the baseplate.
`second fastener bore with the textured outer surface of the
`wherein said driving creates an initial compression between
`quasi-spherical head by positioning at least a portion of a
`he baseplate and the glenoid, and wherein the porous metal
`faceof the textured outer surface of the quasi-spherical head
`sleeve is configured to receive bone ingrowth into the porous
`against at least the first wall of the second fastener bore.
`metal
`sleeve for maintaining said initial compression
`[0015] Example 11 can include, or can optionally be
`between the baseplate and the glenoid.
`combined with the subject matter of Examples 1-10 to
`[0006] Example 2 can include, or can optionally be com-
`optionally include, driving the distal end of the second
`bined with the subject matter of Example 1
`to optionally
`fixation post by applying an impact loading force to the
`include, creating a first post hole in the glenoid bydrilling.
`quasi-spherical head of the second fixation post.
`[0007] Example 3 can include, or can optionally be com-
`bined with the subject matter of Example | or 2 to optionally
`[0016] Example 12 can include, or can optionally be
`
`include, drillingafirst post hole using a drill bit in combi- combined with the subject matter of Examples 1-11 to
`
`
`
`OVERVIEW
`
`
`
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`
`
`optionally include, driving the distal end of the second
`fixation post by applying a press loading force to the
`quasi-spherical head of the second fixation post.
`[0017] Example 13 can include or use subject matter, such
`as a device. The subject matter can comprise a fixation post
`for attaching an orthopedic device to a bone comprising a
`quasi-spherical head with a textured outer surface, a shaft
`including a proximal end attached to the quasi-spherical
`head, a distal end opposite the proximal end, and a bearing
`surtace between the proximal and distal ends, a porous metal
`sleeve including a central bore with a bore surface,
`the
`porous metal sleeve surrounding at least a portion of the
`shaft, wherein the bore surface substantially conforms with
`he bearing surtace, and a cap attached to the distal end of
`he shaft to retain the porous metal slecve on the shaft.
`[0018] Example 14 can include, or can optionally be
`combined with the subject matter of Example 13, to option-
`ally include, the quasi-spherical head and the shaft forming
`a unitary core.
`[0019] Example 15 can include, or can optionally be
`combined with the subject matter of Example 13 or 14 to
`optionally include, the porous metal sleeve having a proxi-
`malsleeve surface in contact with the quasi-spherical head
`and a distal sleeve surface in contact with the cap.
`[0020] Example 16 can include, or can optionally be
`combined. with the subject matter of Examples 13-15 to
`optionally include, an anti-rotation feature on the shaft.
`[0021] Example 17 can include, or can optionally be
`combined with the subject matter of Examples 13-16 to
`optionally include, a generally elliptical cross-section of the
`shaft serving as an anti-rotation feature.
`[0022] Example 18 can include, or can optionally be
`combined with the subject matter of Examples 13-17 to
`optionally include, the anti-rotation feature having a tex-
`tured proximal cap surface configured to conform to the
`distal sleeve surface.
`[0023] Example 19 can include, or can optionally be
`combined with the subject matter of Examples 13-18 to
`optionally include, a distal cap surface of the cap that is
`generally hemispherically shaped.
`[0024] Example 20 can include, or can optionally be
`combined with the subject matter of Examples 13-19 to
`optionally include, a distal cap surface of the cap that is
`generally conically shaped.
`[0025] This overview is intended to provide a summaryof
`the subject matter of the present patent application. It is not
`intended to provide an exclusive or exhaustive explanation
`of the invention. The detailed description is included to
`provide further information about the p resent patent appli-
`cation.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`Inthe drawings, which are not necessarily drawn to
`[0026]
`scale, like numerals may describe similar components in
`different views. Like numerals having, different letter suf-
`fixes may represent different instances of similar compo-
`nents. The drawingsillustrate generally, by way of example.
`but not by way oflimitation, various embodiments discussed
`in the present document.
`[0027]
`FIG. 1 showsa side view of an example fixation
`post.
`['IG. 2 shows an exploded isometric view of an
`[0028]
`example fixation post.
`[0029] FIG.3A showsa cross-section of an example plate.
`
`FIG. 3B showsa radius of a perfect sphere.
`[0030]
`FIG. 3C shows a quasi-spherical member with a
`[0031]
`textured outer surface according to one embodiment of the
`present disclosure.
`[0032]
`FIGS. 4A-4D show examples of quasi-spherical
`members with textured outer surfaces of different densities.
`[0033]
`FIG. 5A showsa cross-section ofa first exemplary
`fixation post.
`[0034]
`FIG. 5B shows a cross-section of a second exem-
`plary fixation post,
`[0035]
`FIG. 6 showsa cross-section of an example ortho-
`pedic implant assembly 600.
`[0036]
`FIG. 7 shows a flowchart illustrating an example
`method for attaching an orthopedic device to a bone.
`
`
`DETAILED DESCRIPTION
`
`
`FIG. 1 showsa side viewof an exemplaryfixation
`[0037]
`post 100. The fixation post 100 can be used to attach a
`surgical implant, such as a glenoid baseplate, to a patient,
`such as a bone ofa patient. ‘lhe fixation post 100 can include
`a core 110, a sleeve 120, such as a sleeve 120 that can be
`located around at least a portion of the core 110, and a cap
`130 attached to the core 110, to retain the sleeve 120 on the
`core 110. The fixation post 100 can include a proximal end
`102 and a distal end 104.
`[0038] The core 110 can include a suitable fastener, such
`as at least one of a suitable surgical post, screw, and rod. The
`suitable fastener can include a head portion and a shaft
`portion attached to the head portion. A diameter of the head
`portion, such as a diameter measured perpendicular to a
`central axis extending along the longest dimension of the
`core 110, can be greater than the diameter of the shaft
`portion. In an example, a sleeve 120 can be located around
`the shaft portion of the core 110, such as an end ofthe sleeve
`120 can contact the head portion of the core 110. A diameter
`ofthe cap 130, such as a diameter measured perpendicular
`to a central axis extending along the longest dimension of
`the core 110, can be greater than the diameter of the shaft
`portion. The cap 130 can be attached to the core 110, such
`as to the end ofthe shaft portion opposite the head portion,
`and contact the sleeve 120, such as the head portion and the
`cap 130 can retain the sleeve 120 onthe shaft portion of the
`core 110.
`[0039]
`FIG. 2 shows an exploded isometric view of an
`exemplary fixation post 100. ‘The core 110 can include a
`quasi-spherical head 112 and a shaft 114. The core 110 can
`include a unitary core, and the quasi-spherical head 112 and
`the shaft 114 can form anintegrally formed single compo-
`nent.
`
`[0040] The quasi-spherical head 112 can interact with a
`surgical
`implant, such as a wall of a fastener bore in a
`glenoid baseplate,
`to lock, such as removably lock, the
`quasi-spherical head 112 to the glenoid baseplate. The
`quasi-spherical head 112 can include a proximal head sur-
`face 111 and a distal head surface 113, such as a distal head
`surface 113 that can be generally parallel to the proximal
`head surface 111.
`[0041]
`FIG. 3A showsa cross-section of an exemplary
`plate 350, such as a glenoid baseplate. The plate 350 can
`include a fastener bore 356. A suitable bore can be tapered
`or non-lapered. Inthis instance, the fastener bore 356 can be
`tapered, to include a first radius 45 positioned near the top
`or entrance into the fastener bore 356 and a second radius 46
`positioned near the bottom or exit from the fastener bore
`
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`356. Optionally. the first radius 45 and the second radius 46
`can be related to measurements on the quasi-spherical
`member 20 (See FIG. 3C). A suitable bore can be or
`incorporate any suitable three-dimensional
`shape, e.g.,
`incorporating rectilinear and/or curvilinear features. A suil-
`able bore can have a frustoconical shape. Suitable shapes of
`a female-type bore can be or include full and partial forms
`of wedges,
`tapered bodies,
`toroids, conoids, catenoids,
`cubes, parallelepipeds, prisms, and combinations of the
`same. Suitable shapes can include,but are not limited to, full
`or partial cylinders, cuboids, cones, pyramids, and tetrahe-
`drons, and combinations of the same. A quasi-spherical
`member 20 with a textured outer surface, such as quasi-
`spherical head 112, and a bore, such as a fastener bore 356
`into which the quasi-spherical member 20 can be received,
`can be any of those disclosed in commonly-owned U.S.
`application Ser. No. 14/557,763, which was filed on Dec. 2,
`2014, and whichis titled “Adjustable Orthopedic Connec-
`tions” and which is hereby incorporated by reference in its
`entirety.
`['IG. 3B showsa perfect sphere 21 having a radius
`[0042]
`23. FIG. 3C illustrates a quasi-spherical member20, such as
`at least a portion of a quasi-spherical head 112 that includes
`anillustrative textured outer surface 11 covering essentially
`the entirety of the quasi-spherical member20. In accordance
`with certain aspects of the present disclosure, quasi-spheri-
`cal members or other male-type connectors in accordance
`with the present disclosure can incorporate a textured outer
`surface covering more than 50%, or more than 65%, or more
`than 75%, or more than 85% of the quasi-sphcrical member
`20 or another connector. In some instances, the textured
`outer surface 11 can cover between about 25% and about
`50% of the quasi-spherical member 20 or another connector,
`or between about 35% and about 75%, or between about
`50% and about 90%, or between about 60% and about
`100%.
`
`[0043] Continuing with FIG. 3C, this particular textured
`outer surface 11 can incorporate a three-dimensionaltessel-
`lation 80. A suitable tessellation can incorporate a plurality
`of polygonal elements, such as polygonal elements 78. In
`this particular instance, the polygonal elementsare triangu-
`lar elements or faces 81. Textured outer surfaces according
`to additional aspects of the present disclosure can incorpo-
`rate other suitable three-dimensional tessellations. In certain
`embodiments, quasi-spherical members or other male-type
`connectors in accordance with the present disclosure will
`mimic or approximate a plurality of stacked polyhedra such
`as but not limited to stacked cubes, rhombic dodecahedrons,
`truncated octahedrons, hexagonal prisms, or triangular
`prisms. In some forms, quasi-spherical members or other
`male-type connectors in accordance with the present disclo-
`sure can mimic or approximate a honeycomb of polyhedral
`cells including uniform and non-uniform honey combs.
`[0044] Continuing with FIG. 3C, the textured outer sur-
`face 11 can include a plurality of outermost extensions 12
`whichin this illustrative embodimentoccurat vertices of the
`triangular faces as discussed hereinbelow. A distance from
`the center of the quasi-spherical member 20 to an outermost
`extension 12 can be equal to the first radius 45. While not
`necessary, an arc connecting at least two of the outermost
`extension 12 can have generally the same curvature as the
`arc of the perfect sphere 21. The textured outer surface 11
`can include a plurality of innermost depressions 13 which in
`this illustrative embodiment occur at the centers of the
`
`triangular faces as discussed hereinbelow. A distance from
`the center of the quasi-spherical member 20 to an innermost
`depression 13 can be equal to the second radius 46. While
`not necessary, an arc connecting at least two of the inner-
`most depressions can have generally the same curvature as
`the arc of the perfect sphere 21. A secure grip between the
`textured outer surface 11 and the wall of the fastener bore
`can occur at one or more interfaces 22. While not necessary
`, the relationship between the first radius 45 and the second
`radius 46 can be as follows: where R=a radius 23 of a perfect
`sphere 21, the first radius 45=R+t and the second radius
`46=R-1, where “t’” is a variable that can be changedto create
`variable textured surfaces 11.
`
`FIGS. 4A-D illustrate a spectrum of densities of
`[0045]
`tessellation patterns 80. FIG. 4A provides a quasi-spherical
`member20 with a low density 28 of polygonal elements 78.
`FIG. 40 provides a quasi-spherical member 20 with a high
`density 27 of polygonal elements 78. FIGS. 4B-4Cillustrate
`quasi-spherical members 20 with lower and higher interme-
`diate densities 29 of polygonal elements 78. A quasi-spheri-
`cal member 20 with a higher density can allow a higher
`quality of spherical mapping. As the quasi-spherical member
`20 can be adjusted in the fastener bore, the higher quality
`mapping can allow a greater spectrum of possible orienta-
`tions or angular positions of the quasi-spherical head 112 in
`relation to the baseplate.
`[0046]
`FIG. 4A shows features of the polygonal surface
`elements 78. An individual polygon 86 can have an exterior
`face 87 that forms an outer surface on the quasi-spherical
`member 20. The exterior face 87 can include a chord 89 as
`
`an edge of the exterior face 87. Each cord 89 can be
`contiguous with a chord 89 of a neighboring polygon 79.
`The chord 89 can terminate al each end in a vertex 88. Each
`vertex 88 of a polygon 86 can be contiguous with a vertex
`88 of a neighboring polygon 79. Any number of these
`exterior surface features (e.g., edges, chords, planar or
`non-planar faces, vertices, etc.) and/or any of the other
`exterior surface features disclosed herein that can be incor-
`porated into a textured outer surface of a connecting member
`can forcibly contact walls or surfaces in a bore to some
`degree, and in someinstances, can be formed with materials
`that cause suchsurface features to be crushedor to otherwise
`deform upon such forcible contact, to removeably lock or
`help to removeably lock the male-type connecting member
`in the bore. In an example, a plurality of planar or nearly
`planar faces on a textured outer surface of a connecting
`member(c.g., a quasi-spherical member) can cach partially
`contact a curved wall ofa bore (e.g., cylindrical or conical).
`[0047]
`In accordance with certain aspects of the present
`disclosure, quasi-spherical membersor other male-type con-
`neclors in accordance with the present disclosure can incor-
`porate a textured outer surface that can includea plurality of
`generally planar surfaces, for example, where the combined
`area of the generally planar surfaces cover more than 50%,
`or more than 65%, or more than 75%, or more than 85% of
`the quasi-spherical memberor another male-type connecting
`member.
`In some instances,
`the combined arca of the
`generally planar surfaces can cover between about 25% and
`about 50% of the quasi-spherical memberor other male-type
`connecting member, or between about 35% and about 75%,
`or between about 50% and about 90%, or between about
`60% and about 100%.
`
`[0048] The quasi-spherical head 112 can includethe quasi-
`spherical member20, suchas at least a portion of the volume
`
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`CATALYST, EX-1019
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`US 2018/0193074 Al
`
`Jul. 12, 2018
`
`the
`In an example,
`of the quasi-spherical member 20.
`quasi-spherical head 112 can include a portion ofthe volume
`of the quasi-spherical member 20, such as a volume in a
`range of approximately 25% to 100%of the volume of the
`quasi-spherical member 20, such as about 30%, 35%, 40%,
`45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%,
`95%, and 100% of the volumeof the quasi-sphcrical mem-
`ber 20.
`
`[0049] Referring again to FIG.2, the shaft 114 can provide
`mechanical support for the fixation post 100, such as when
`the fixation post 100 can act as a fastener. The shaft 114 can
`include a proximal shaft end 115, a distal shaft end 116
`opposite the proximal shaft end 115, and a bearing surface
`117, such as a surface of the shaft 114 extending between the
`proximal shaft end 115 and the distal shaft end 116. The
`shaft 114 can include a central axis extending along the
`longest dimension ofthe shaft 114, such as an axis extending
`throughhe centroid of a cross-sectional area of the shaft 114
`perpendicular to the central axis, such as one or more
`cross-sectional areas. The cross-sectional area can include
`areas that are symmetric, such as a circle or an ellipse, or
`asymmetric. In an example, the shaft 114 can include a right
`circular cylinder, such as a shaft 114 with a circular cross-
`section, or a right ellipsoidal cylinder, such as a shaft 114
`with an elliptical cross-section.
`[0050]
`‘Lhe shaft 114 can be constructed of a biocompat-
`ible material, such as one or more biocompatible materials.
`A biocompatible material can include ceramics, synthetic
`polymeric materials, and metallic materials, such as Ula-
`nium, a titaniumalloy, cobalt chromium, cobalt chromium
`molybdenum, tantalum, a tantalum alloy, stainless steel, or
`a combination thereof.
`
`[0051] The sleeve 120 can surroundat least a portion of
`the core 110, suchas at least a portion of the shaft 114. The
`sleeve 120 can provide a surface, such as an external surface,
`to attach to a patient interface surface, such as a wall of a
`hole in a patient bone. The hole in the patient bone can be
`configured to receive the fixation post 100 to secure the
`fixation post 100 to the patient bone, such as to provide an
`initial compression between two components connected by
`the fixation post 100, such as between a baseplate and the
`patient bone. The sleeve can provide a surface, such as a
`porous surface, for the ingrowth of tissue, such as bone
`tissue, to retain the fixation post 100 within the patient bone.
`to maintain the initial compression between the baseplate
`and the patient bone while the patient heals. The sleeve 120
`can include a proximal end surface 125, a distal end surface
`126 generally parallel to the proximal end surtace 125, a
`central bore with a bore surface 127, such as a bore surface
`127that substantially conforms with the bearing surface 117
`of the shaft 114, and an exterior surface 128, that can be in
`contact with the patient bone.
`[0052] The sleeve 120 can substantially conform to the
`shaft 114, or in other words the bore surface 127 can
`substantially conform to the bearing surface 117 of the shaft
`114, to distribute loads transmitted from the shaft 114 to the
`sleeve 120. “Substantially conform” can describe the
`amount of contact interface between two surfaces, such as
`the bearing surface 117 and the bore surface 127, to form an
`interface between the bore surface 127 and the bearing
`surface 117. The sleeve 120 can substantially conform to the
`shaft 114, such as when a substantial portion of the bore
`surface 127 can contact the bearing surface 117 of he shaft
`114. A substantial portion of the bore surface 127 can
`
`include a range of approximately 50% to 100% ofthe bore
`surface 127, such as approximately 60%, 70%, 80%, 90%,
`or 100% of the bore surface 127. In an example, a shaft 114
`with a first set of physical dimensions, such as diameter,
`length, and taper of the shaft 114, and a bore surface 127,
`such as with generally the samefirst set of physical dimen-
`sions as the shaft 114, can substantially conform to one
`another, such as when locating the bore surface 127 on the
`beating surface 117, such as by sliding the sleeve 120 onto
`the shaft 114. ‘The distal shaft end 116 can be approximately
`parallel with the distal end surface 126 of the sleeve 120 or
`protrude from the distal end surface 126, such as to receive
`the cap 130.
`[0053] The sleeve 120 can be located on the core 110 to
`minimize motion betweenthe sleeve 120 and the shaft 114.
`Minimizing motion can contribute to maintaining a com-
`pressive force between the surgical implant and the patient
`bone,to preserve ingrowth of bonetissue into the sleeve 120
`and more permanently integrate the fixation post 100 into
`the patient bone.
`[0054] Longitudinal motion can occur between the sleeve
`120 and the shaft 114, such that the sleeve 120 can move
`with respect to the shaft 114 in a direction along the central
`axis of the shaft 114. Longitudinal motion can be minimized,
`such as by locating the sleeve 120 snugly between the
`quasi-spherical head 112 and the cap 130. In an example, the
`sleeve 120 can be located on the core 110 and substantially
`conformto the shaft 114. The cap 130 canbe attached to the
`shaft 114, suchas at the distal shaft end 116, and against the
`distal end surface 126 of the sleeve 120, such as to locate the
`proximalend surface 125 of the sleeve 120 againstthe distal
`head surface 113, so as to minimize linear motion of the
`sleeve 120 along the central axis of the shaft 114.
`[0055] Rotational motion can occur between the sleeve
`120 and the shaft 114, such that the sleeve 120 can rotate
`about the shaft 114. Rotational motion can be minimized,
`such as with the use of an anti-rotation feature, such as a
`characteristic of the fixation post 100 that can be configured
`to inhibit rotational motion. In an example, the shaft 114 can
`be configured with a non-circular cross-section, such as an
`elliptical cross-section, and the bore surface 127 of the
`sleeve 120 can substantially conform to the non-circular
`cross-section. Rotational forecs applicd to the sleeve 120
`can be resisted by opposing forces created by the shaft 114,
`suchas forces created near the majorverticesofthe elliptical
`cross-sectionat the interface between the sleeve 120 and the
`shaft 114, to minimize rotational motion of the sleeve 120
`about the shaft 114.
`
`FIGS. 5A & 5B show cross-sections of a first
`[0056]
`exemplary fixation post 100 and a second exemplary fixation
`post 100, respectively. The cross-sectional area defining the
`shaft 114, such as the cross-sectional area ofthe shaft 114
`perpendicular to the central axis of the shaft 114, can vary
`in planar area along the central axis of the shaft 114, such
`that the cross-sectional area at any location along the central
`axis can