U.S. patent application number 13/795980 was filed with the patent office on 2013-07-25 for modular center pegged glenoid.
This patent application is currently assigned to BIOMET MANUFACTURING CORP.. The applicant listed for this patent is Biomet Manufacturing Corp.. Invention is credited to Brian K. Berelsman, Bryce A. Isch, Russell M. Parrott, Thomas M. Vanasse, Nathan A. Winslow, Kane Wu.
Application Number | 20130190881 13/795980 |
Document ID | / |
Family ID | 43535413 |
Filed Date | 2013-07-25 |
United States Patent
Application |
20130190881 |
Kind Code |
A1 |
Winslow; Nathan A. ; et
al. |
July 25, 2013 |
MODULAR CENTER PEGGED GLENOID
Abstract
A glenoid prosthetic is provided and may include a first
component having an articulating surface engaged by the head of a
humeral component or a natural humerus and an engagement surface
formed on an opposite side of the first component than the
articulating surface. A second component may be attached to the
first component proximate to the engagement surface and may be
attached to a resected glenoid of a scapula. The second component
may be formed from a different material than the first component
and may include at least one coupling stem received within an
aperture formed in the resected glenoid.
Inventors: |
Winslow; Nathan A.; (Warsaw,
IN) ; Berelsman; Brian K.; (Warsaw, IN) ;
Parrott; Russell M.; (Winona Lake, IN) ; Isch; Bryce
A.; (Bluffton, IN) ; Vanasse; Thomas M.;
(Warsaw, IN) ; Wu; Kane; (Warsaw, IN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Biomet Manufacturing Corp.; |
Warsaw |
IN |
US |
|
|
Assignee: |
BIOMET MANUFACTURING CORP.
Warsaw
IN
|
Family ID: |
43535413 |
Appl. No.: |
13/795980 |
Filed: |
March 12, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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|
12835223 |
Jul 13, 2010 |
8425614 |
|
|
13795980 |
|
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|
|
11385035 |
Mar 20, 2006 |
7753959 |
|
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12835223 |
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Current U.S.
Class: |
623/19.11 |
Current CPC
Class: |
A61B 17/8805 20130101;
A61F 2002/30886 20130101; A61F 2002/3092 20130101; A61F 2230/0069
20130101; A61F 2/4014 20130101; A61F 2002/30604 20130101; A61F
2002/30797 20130101; A61F 2002/30878 20130101; A61F 2/4003
20130101; A61F 2002/30881 20130101; A61F 2/4081 20130101; A61F
2002/30897 20130101; A61F 2220/0033 20130101; A61F 2250/0062
20130101; A61F 2002/4629 20130101; A61F 2002/30957 20130101; A61F
2002/30607 20130101; A61F 2220/0008 20130101; A61F 2/40 20130101;
A61F 2002/305 20130101; A61F 2002/30822 20130101; A61F 2/30767
20130101; A61F 2/0095 20130101; A61F 2002/30474 20130101; A61F
2002/30332 20130101; A61F 2220/0025 20130101; A61F 2002/30884
20130101; A61B 50/33 20160201; A61F 2310/00011 20130101; A61F
2002/30616 20130101; A61B 50/30 20160201; A61F 2002/4631 20130101;
A61B 17/1684 20130101; A61F 2002/30769 20130101; A61F 2002/30405
20130101; A61B 17/1778 20161101; A61F 2/30749 20130101; A61F 2/4637
20130101; A61F 2310/00179 20130101; A61F 2002/30224 20130101; A61B
17/1659 20130101; A61F 2002/30892 20130101 |
Class at
Publication: |
623/19.11 |
International
Class: |
A61F 2/40 20060101
A61F002/40 |
Claims
1. A glenoid prosthetic comprising: a first component having an
articulating surface operable to be engaged by the head of a
humeral component or a natural humerus and an engagement surface
formed on an opposite side of said first component than said
articulating surface; and a second component attached to said first
component proximate to said engagement surface and operable to be
attached to a resected glenoid of a scapula, said second component
being formed from a different material than said first component
and including at least one coupling stem operable to be received
within an aperture formed in said resected glenoid.
2. The glenoid prosthetic of claim 1, wherein said second component
is attached to said first component via a snap-fit.
3. The glenoid prosthetic of claim 1, wherein said second component
is attached to said first component at a perimeter surface of said
first component, said perimeter surface being disposed
substantially perpendicular to said engagement surface.
4. The glenoid prosthetic of claim 1, wherein said first component
includes a radial groove formed in a perimeter surface thereof,
said perimeter surface being disposed substantially perpendicular
to said engagement surface.
5. The glenoid prosthetic of claim 4, wherein said second component
includes a flange received by said radial groove to attach said
second component to said first component.
6. The glenoid prosthetic of claim 5, wherein said second component
includes at least one peg extending into a bore formed in said
first component at said engagement surface to attach said second
component to said first component.
7. The glenoid prosthetic of claim 6, wherein said second component
is attached to said first component via a snap-fit at said radial
groove.
8. The glenoid prosthetic of claim 4, wherein said second component
is attached to said first component via a snap-fit at said radial
groove.
9. The glenoid prosthetic of claim 1, wherein said second component
is molded onto said first component.
10. The glenoid prosthetic of claim 1, wherein said first component
is formed from a polymer material and said second component is
formed from metal.
11. A glenoid prosthetic comprising: a first component having an
articulating surface operable to be engaged by the head of a
humeral component or a natural humerus and an engagement surface
formed on an opposite side of said first component than said
articulating surface; and a second component attached to said first
component proximate to said engagement surface and operable to be
attached to a resected glenoid of a scapula, said second component
being attached to said first component via a snap-fit and including
at least one coupling stem operable to be received within an
aperture formed in said resected glenoid.
12. The glenoid prosthetic of claim 11, wherein said second
component at least partially surrounds a perimeter surface of said
first component, said perimeter surface being disposed
substantially perpendicular to said engagement surface.
13. The glenoid prosthetic of claim 11, wherein said second
component is attached to said first component at a perimeter
surface of said first component, said perimeter surface being
disposed substantially perpendicular to said engagement
surface.
14. The glenoid prosthetic of claim 11, wherein said first
component includes a radial groove formed in a perimeter surface
thereof, said perimeter surface being disposed substantially
perpendicular to said engagement surface.
15. The glenoid prosthetic of claim 14, wherein said second
component includes a flange received by said radial groove to
attach said second component to said first component.
16. The glenoid prosthetic of claim 15, wherein said second
component includes at least one peg extending into a bore formed in
said first component at said engagement surface to attach said
second component to said first component.
17. The glenoid prosthetic of claim 16, wherein said second
component is attached to said first component via said snap-fit at
said radial groove.
18. The glenoid prosthetic of claim 14, wherein said second
component is attached to said first component via said snap-fit at
said radial groove.
19. The glenoid prosthetic of claim 11, wherein said first
component is formed from a polymer material and said second
component is formed from metal.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 12/835,223, filed on Jul. 13, 2010, which is a
continuation-in-part of U.S. patent application Ser. No.
11/385,035, filed on Mar. 20, 2006 (now U.S. Pat. No. 7,753,959).
The entire disclosures of each of the above applications are
incorporated herein by reference.
FIELD
[0002] The present disclosure relates to a prosthetic device and,
more particularly, to a modular glenoid prosthetic.
BACKGROUND
[0003] The statements in this section merely provide background
information related to the present disclosure and may not
constitute prior art. A natural shoulder joint may undergo
degenerative changes due to a variety of etiologies. When these
degenerative changes become so far advanced and irreversible, it
may ultimately become necessary to replace a natural shoulder joint
with a prosthetic shoulder joint. When implantation of such a
shoulder joint prosthesis becomes necessary, the natural head
portion of the humerus can be resected and a cavity is created in
the intramedullary canal of the host humerus for accepting a
humeral component. The humeral component includes a head portion
used to replace the natural head of the humerus. Once the humeral
component has been implanted, the glenoid cavity positioned at the
lateral edge of the scapula may also be resurfaced and shaped to
accept a glenoid component. The glenoid component generally
includes an articulating surface which is engaged by the head
portion of the humeral component.
[0004] It is generally known in the art to provide a shoulder joint
prosthesis having a glenoid component, as discussed above. However,
the current prior art glenoid components along with the associated
surgical components and instruments utilized during shoulder
arthroplasty suffer from many disadvantages.
[0005] For example, since the glenoid component is subject to
various types of loading by the head portion of the humeral
component, the glenoid component must offer a stable and secure
articulating surface. To achieve this, some glenoid components
provide pegs that are inserted and cemented into holes bored into
the glenoid cavity. However, such existing pegged glenoid
components also exhibit several disadvantages. For example, some of
the pegged glenoid components utilize up to five pegs to stabilize
and secure the glenoid component to the scapula. Such glenoid
components increase the amount of bone tissue removed, while also
increasing the labor and complexity of the shoulder arthroplasty.
Other pegged glenoid components may offer one or two larger
diameter pegs that reduce the complexity of the shoulder
arthroplasty. However, the larger diameter pegs also requires
excess bone tissue to be removed that may not be practical in some
patients. Furthermore, the use of one or two pegs may potentially
reduce overall stability of the glenoid component, similar to a
keeled glenoid.
[0006] Additionally, most prior art glenoid components only rely on
the keel or pegs to secure the glenoid component to the scapula,
via a cement mantle. These systems are typically rigid in fixation
methods. In this regard, the prior art systems fail to provide a
selection of coupling mechanisms which may best be used to address
varying degenerative changes or specific muscular needs of a
patient.
[0007] What is needed then is a glenoid component and associated
surgical components for use in shoulder arthroplasty that does not
suffer from the above-mentioned disadvantages. This in turn, will
provide a glenoid component which is stable and secure, reduces the
overall amount of bone tissue required to be removed, reduces
inventory, reduces the overall surgical time and complexity,
increases overall medial surface area, enhances and increases
attachment strength and adaptivity without increasing overall peg
diameter, provides a fully enhanced coupling mechanism and
increased overall stability, and provides increased tensile and
shear strength. It is, therefore, an object of the present
invention to provide such a glenoid component and associated
surgical components for use in shoulder arthroplasty.
SUMMARY
[0008] This section provides a general summary of the disclosure,
and is not a comprehensive disclosure of its full scope or all of
its features.
[0009] A glenoid prosthetic is provided and may include a first
component having an articulating surface engaged by the head of a
humeral component or a natural humerus and an engagement surface
formed on an opposite side of the first component than the
articulating surface. A second component may be attached to the
first component proximate to the engagement surface and may be
attached to a resected glenoid of a scapula. The second component
may be formed from a different material than the first component
and may include at least one coupling stem received within an
aperture formed in the resected glenoid.
[0010] In another configuration, a glenoid prosthetic is provided
and may include a first component having an articulating surface
engaged by the head of a humeral component or a natural humerus and
an engagement surface formed on an opposite side of the first
component than the articulating surface. A second component may be
attached to the first component proximate to the engagement surface
and may be attached to a resected glenoid of a scapula. The second
component may be attached to the first component via a snap-fit and
may include at least one coupling stem received within an aperture
formed in the resected glenoid.
[0011] Further areas of applicability will become apparent from the
description provided herein. The description and specific examples
in this summary are intended for purposes of illustration only and
are not intended to limit the scope of the present disclosure.
DRAWINGS
[0012] The drawings described herein are for illustration purposes
only and are not intended to limit the scope of the present
disclosure in any way.
[0013] FIG. 1 represents an exploded view of a modular glenoid
according to the present teachings of the present disclosure;
[0014] FIG. 2 represents a second glenoid according to the present
teachings;
[0015] FIGS. 3A and 3B represent perspective and side views of the
glenoid according to FIG. 1;
[0016] FIGS. 4A and 4B represent perspective and side views of the
glenoid according to FIG. 2;
[0017] FIGS. 5A and 5B represent alternate perspective and
cross-sectional views according to the present teachings;
[0018] FIGS. 6A-6E represent perspective views of various stems
usable in the glenoids shown in FIGS. 1-4B;
[0019] FIGS. 7A-7C represent various drive mechanisms;
[0020] FIGS. 8A-8E represent cross-sectional views of the stems
shown in FIGS. 6A-6E;
[0021] FIGS. 9-12 represent perspective views of the preparation of
the glenoid to accept the prosthetic shown in FIGS. 1-8E;
[0022] FIG. 13 represents the implantation of the glenoid shown in
FIG. 1;
[0023] FIG. 14 represents a side cross-sectional view of a glenoid
according to the present teachings implanted into a resected
glenoid;
[0024] FIG. 15 represents a system of modular glenoid components
according to the present teachings;
[0025] FIGS. 16 and 17 represent perspective and cross-sectional
views of an alternate glenoid component according to the present
teachings;
[0026] FIGS. 18A and 18B represent an integrally molded stem and
glenoid component according to the present teachings;
[0027] FIGS. 19A and 18B represent perspective and cross-sectional
views of a glenoid prosthetic according to the present
teachings;
[0028] FIG. 20 represents a cross-sectional view of an alternate
humeral head prosthetic according to the present teachings;
[0029] FIGS. 21-24 represent top and side views of various coupling
members according to the present teachings; and
[0030] FIG. 25 represents a cross-sectional view of the coupling
member shown in FIG. 22.
DETAILED DESCRIPTION
[0031] The following description is merely exemplary in nature and
is not intended to limit the present disclosure, application, or
uses.
[0032] Referring generally to FIGS. 1 and 2 which represent
perspective views of the modular glenoid component according to the
teachings of the present application. Shown is a glenoid prosthetic
20. The glenoid prosthetic 20 has a first side 22 having a
generally spherical articulating surface 24 and a second coupling
side 26. The spherical articulating surface 24 is adapted to permit
rotational and translational movement of the head of the humeral
component (not shown) or natural humerus. The coupling side 26 can
include one or more fixed coupling stems 28 that are configured to
couple the glenoid to a plurality of apertures defined within a
resected glenoid.
[0033] The coupling stems 28 can be configured to include a first
superior fixed peg 28 and a pair of second inferior fixed pegs 28,
each fixed peg 28 positioned on the coupling side 26 to form the
corners of a triangle and, preferably, an isosceles triangle. The
coupling stems 28 can take on various forms. In this regard, the
fixed stems 28 can have a relatively smooth profile which define
annular and/or longitudinal grooves 33. As described below, the
grooves 33 can be configured to accept bone cement to fixably
couple the peg to apertures 35 defined within a resected glenoid
37. As shown in FIG. 2, the fixed glenoid stems 28 can have a
plurality of aperture engaging flanges 31. Defined on the flanges
31 can be a plurality of grooves 39. These grooves 39 can be
co-axial with grooves 33 defined by the stem 28.
[0034] As best seen in FIGS. 3A-3B, the coupling side 26 of the
glenoid 20 also defines a central stem coupling mechanism 34. The
coupling mechanism 34 is configured to removably and selectively
couple a central fixation peg 48 to the coupling side 26. This
mechanism can define male or female threaded portions which
interface with the central stem 48. As shown, the coupling
mechanism 34 can define a threaded coupling aperture 36 within a
generally cylindrical body 38. As shown in FIGS. 4A-5B, this
cylinder can have a flat or curved exterior surface. In this
regard, it is envisioned the exterior surface can be tapered to
transition into the coupling side 26. Disposed within the body 38
can be an internally threaded bushing 40. Defined on an exterior
surface of the bushing 40 are optional coupling flanges 42 that are
configured to couple the bushing 40 to the cylindrical body 38.
This bushing can be coupled to the glenoid during a molding
process, or the bushing can be press-fit into the coupling side
26.
[0035] FIGS. 6A-6E represent perspective and side views of the
optional central coupling stems 48. Each of the central coupling
stems 48 can have a threaded coupling member 50 which is configured
to fixably interface the stem 48 with the threaded aperture 36 of
the central coupling mechanism 34. The stems 48 further have a
bearing surface or shoulder 51 configured to interface with a
bearing surface or base 53 on the central coupling mechanism 34.
Optionally, the stems 48 can have a textured coupling surface.
[0036] FIG. 6A represents a center peg 48 having a generally
cylindrical fixation peg with an exterior powder metal coating.
FIGS. 6B-6D represent central pegs having at least one aperture
engaging flange. These flanges can either be used to interface with
the interior of an aperture formed in the scapula or can be used to
retain bone cement in the aperture. FIG. 6E represents a porous
central peg having a stepped exterior surface. The stepped exterior
surface has varying diameter portions.
[0037] As shown, the central stem 48 can have various surface
treatments. It is envisioned the stem can be formed of a
biocompatible polymer, metallic or ceramic. Additionally, the
central pegs can have surface treatment such as powder metal spray
coating or other porous structures to facilitate the ingrowth of
bone. As shown in FIGS. 7A-7C, optionally, the stems 48 can have
drive surfaces 57 defined on a surface of the stem 48. These drive
surfaces 57 can be a multi-faceted extension or a multi-faceted
surface defined within a bore in the stem 48.
[0038] Shown in FIGS. 8A-8E, the stem can have various
cross-sections. In this regard, the diameters of the stems can vary
along the length of the stems 48. As shown in FIGS. 6B-6D, the
stems 48 can have various coupling flanges 55 incorporated thereon.
These coupling flanges 55 can be configured to have an exterior
diameter which is less than, equal to, or greater than the
corresponding diameter of a portion of an aperture disposed in the
resected glenoid 37. Each of the stems 48 is configured to
interface with a bearing surface on the central coupling mechanism
34.
[0039] FIGS. 9-13 represent the preparation and insertion of the
glenoid 20 according to the teachings herein. As shown in FIG. 9, a
second drilling guide 64 can be used to position a central pilot
hole 67 into the surface 62. After the preparation of a central
guide hole 67, as shown in FIG. 10, the surface of the glenoid 62
is prepared using a rotating rasp or file 52. The scapula is then
machined to form the resected glenoid 37. Shown is a rotating rasp
52 used to prepare a planar or curved glenoid surface to mate with
the coupling side of the prosthetic 20.
[0040] After the resection, a plurality of fixed peg accepting
holes 59 are machined into the resected glenoid 37. FIG. 11
represents the use of a drilling guide 56 for the placement of
holes within the resected glenoid 37. In this regard, it is
envisioned that the drilling guide 56 be used to position the
apertures for the acceptance of the fixed stems 28. As shown in
FIG. 12, immediately about a central pilot hole, a surface 66 is
prepared which is configured to accept the stem coupling mechanism
34. The center stem accepting aperture can be formed either prior
to or after the preparation of the surface 66 to accept the stem
coupling mechanism 34. At this point, the physician can determine
if a central fixation peg 48 is needed. If the central peg 48 is
needed, the physician will further determine a preferred central
peg fixation surface and a preferred central peg fixation size. The
appropriate peg 48 is then chosen and theadably coupled to the
glenoid 20 so as to cause engagement of the stem bearing surface 51
with the bearing surface 53 on the central coupling mechanism
34.
[0041] As shown in FIG. 13, it is envisioned that bone cement or
biological materials can be injected into the apertures defined
within the resected glenoid 37. These materials can be inserted
into the holes configured to accept the fixed pegs or the central
stem 48. It is equally envisioned that the central stem 48 can be
inserted into the aperture so as to form an interference fit
between the central stem 48 and the aperture. With the appropriate
coupling stem 48 fixed to the bushing within the coupling mechanism
34, proper coupling of the glenoid 20 can occur. In this regard,
the central stem 48 is threadably coupled to an aperture within the
central stem coupling mechanism 34. The fixed and central stems are
positioned within the apertures to couple the glenoid member 20 to
the resected glenoid 37.
[0042] FIG. 14 represents a cross-sectional view of an implanted
glenoid 20. Shown is the relationship between the articulating
surface 24, fixed stems 28, and the central stem 48. Optionally,
the coupling side 26 can be bonded to the resected glenoid using
bone cement and further can have surface treatments to facilitate
bonding. Further shown is the central stem 48 in relation to the
threaded aperture 36 of the central stem coupling mechanism 34.
[0043] FIG. 15 represents a system of prosthetic components as
described above. Shown are various glenoid prosthetics 20 as well
as various size and shaped central stem portions 48. These stems 48
have various exterior surface treatments and configurations as well
as varying lengths and diameters. It is envisioned that the system
also includes the appropriate types of bone fixation cement,
cutting members, cutting pattern guides, as well as humeral head
and fixation stem prosthetics.
[0044] Referring generally to FIGS. 16 and 17 which represent
perspective and cross sectional views of the modular glenoid
component according to an alternate teaching. Shown is a glenoid
prosthetic 20. The glenoid prosthetic 20 has a first side 22 having
a generally spherical articulating surface 24 and a second coupling
side 26. The spherical articulating surface 24 is adapted to permit
rotational and translational movement of the head of the humeral
component (not shown) or natural humerus. The coupling side 26 can
include one or more removable peripheral coupling stems 28 that are
configured to couple the glenoid to a plurality of apertures
defined within a resected glenoid.
[0045] The coupling stems 28 can be configured to include a first
superior removable peg 28 and a pair of second inferior removable
pegs 28. Each removable peg 28 is positioned on the coupling side
26 to form the corners of a triangle and, optionally, an isosceles
triangle. The coupling pegs 28 can take on various forms. In this
regard, the pegs 28 can have a relatively smooth profile which
define annular and/or longitudinal grooves 33. As described above,
the grooves 33 can be configured to accept bone cement to fixably
couple the peg to apertures 35 defined within a resected glenoid
37. As shown in FIG. 17, the fixed glenoid stems 28 can have a
porous outer coating such as Regenerex (see also FIG. 8A).
[0046] It is envisioned that the pegs 28 can be coupled to the
coupling side via a threaded member or a locking taper. The
threaded member 60 can have a self tapping thread configured to
engage a threaded hole formed in the coupling side 26.
Additionally, the threaded member 60 can be coupled to a bushing
integrally molded into the glenoid prosthetic 20. Optionally, the
threaded bushing can have a textured exterior surface or retaining
flange to facilitate the integration thereof. Each peg has a flat
bearing surface configured to bear against a flat bearing surface
on the medial side or the bushing.
[0047] As shown in FIGS. 18A and 18B, the coupling stem 48 can be
integrally molded into the glenoid prosthetic 20. In this regard,
the premachined stem 48 can have a porous coating integrally formed
thereon. Additionally formed on the stem 28 can be a plurality of
flanges used to fix the coupling stem into the glenoid prosthetic
and protruding from the coupling surface 26. As described above,
the central fixation stem can be coupled to the threaded central
bore 36 formed in the plastic or an inserted bushing.
[0048] As shown in FIG. 18B, the stem 28 can be formed of a
titanium substrate 70 with an applied Regenerex layer. The
Regenerex layer can be machined prior to being placed within a
mold. A blank which is used to form the glenoid body 20 can then be
formed by molding an e-poly block over the titanium stem
substrates. The polymer can be formed of sintered UHMWPE 1050
powder. This polymer can be doped with vitamin E for six hours and
then homogenized for 400 hours. The polymer can then be machined
into final form after molding. In this regard, the bearing and
interface surfaces 24, 20 can be machined into the glenoid
prosthetic 20.
[0049] FIGS. 19A and 19B represent perspective and cross sectional
views of the modular glenoid component according to an alternate
teaching. The glenoid prosthetic 20 has a first side 22 having a
generally spherical articulating surface 24 and a second coupling
side 26. The spherical articulating surface 24 is adapted to permit
rotational and translational movement of the head of the humeral
component (not shown) or natural humerus. The coupling side 26 can
be formed of a tray 62 which includes one or more fixed peripheral
coupling stems 28 that are configured to couple the glenoid to a
plurality of apertures defined within a prepared glenoid. The
polymer bearing can be integrally molded onto the tray 62, or can
be snapped onto the tray 62 using a snap feature 64. Alternatively,
the bearing can be coupled to the tray 62 using integral coupling
pegs 68. The tray incorporated pegs 68 can have surface treatments
or flanges to facilitate fixation.
[0050] FIG. 20 represents a cross-sectional view of an alternate
humeral component according to the present teachings. Shown is a
resected humerus 74 having a coupling member 76 disposed therein.
The coupling member 76 has a generally cylindrical body 78 having a
plurality of bone engaging flanges 80 disposed thereon. The
generally cylindrical body 78 has an outer surface having a
generally constant exterior diameter. Disposed at a proximal end 82
of the body is a generally planar and circular head coupling
surface 86. The head coupling surface 86 has an associated coupling
taper 88 configured to couple a humeral head 92 to the coupling
member 76.
[0051] As shown in FIGS. 21 and 23, the body can have a circular or
an oblong circular cross-sectional shape. It is envisioned the
shape can be formed into the resected humerus 74 using a rotating
cutting member and a cutting measurement guide. The coupling member
76 can be impacted into an aperture formed into the resected head
or head and neck of the humerus 74. In this regard, an impaction
tool (not shown) can be coupled to a threaded hole 88 defined
within the body. Slots can be formed into the humerus 74 to accept
the retaining flanges therein. Optionally, the entire prosthetic
can be placed within only the head or head and neck, and not into
the medullary canal.
[0052] As shown in FIGS. 24 and 25, the exterior surface of the
body can be uncoated or at least be partially coated with metallic
powder coating, or coatings such as Regenerex, configured to
promote boney in-growth. This powder metal or bone growth promoter
can also cover the generally planar interface surface 90 at the
distal end 92 of the coupling member.
[0053] Example embodiments are provided so that this disclosure
will be thorough, and will fully convey the scope to those who are
skilled in the art. Numerous specific details are set forth such as
examples of specific components, devices, and methods, to provide a
thorough understanding of embodiments of the present disclosure. It
will be apparent to those skilled in the art that specific details
need not be employed, that example embodiments may be embodied in
many different forms and that neither should be construed to limit
the scope of the disclosure. In some example embodiments,
well-known processes, well-known device structures, and well-known
technologies are not described in detail.
[0054] The terminology used herein is for the purpose of describing
particular example embodiments only and is not intended to be
limiting. As used herein, the singular forms "a," "an" and "the"
may be intended to include the plural forms as well, unless the
context clearly indicates otherwise. The terms "comprises,"
"comprising," "including," and "having," are inclusive and
therefore specify the presence of stated features, integers, steps,
operations, elements, and/or components, but do not preclude the
presence or addition of one or more other features, integers,
steps, operations, elements, components, and/or groups thereof. The
method steps, processes, and operations described herein are not to
be construed as necessarily requiring their performance in the
particular order discussed or illustrated, unless specifically
identified as an order of performance. It is also to be understood
that additional or alternative steps may be employed.
[0055] When an element or layer is referred to as being "on,"
"engaged to," "connected to" or "coupled to" another element or
layer, it may be directly on, engaged, connected or coupled to the
other element or layer, or intervening elements or layers may be
present. In contrast, when an element is referred to as being
"directly on," "directly engaged to," "directly connected to" or
"directly coupled to" another element or layer, there may be no
intervening elements or layers present. Other words used to
describe the relationship between elements should be interpreted in
a like fashion (e.g., "between" versus "directly between,"
"adjacent" versus "directly adjacent," etc.). As used herein, the
term "and/or" includes any and all combinations of one or more of
the associated listed items.
[0056] Although the terms first, second, third, etc. may be used
herein to describe various elements, components, regions, layers
and/or sections, these elements, components, regions, layers and/or
sections should not be limited by these terms. These terms may be
only used to distinguish one element, component, region, layer or
section from another region, layer or section. Terms such as
"first," "second," and other numerical terms when used herein do
not imply a sequence or order unless clearly indicated by the
context. Thus, a first element, component, region, layer or section
discussed below could be termed a second element, component,
region, layer or section without departing from the teachings of
the example embodiments.
[0057] Spatially relative terms, such as "inner," "outer,"
"beneath," "below," "lower," "above," "upper" and the like, may be
used herein for ease of description to describe one element or
feature's relationship to another element(s) or feature(s) as
illustrated in the figures. Spatially relative terms may be
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 turned over,
elements described as "below" or "beneath" other elements or
features would then be oriented "above" the other elements or
features. Thus, the example term "below" can encompass both an
orientation of above and below. The device may be otherwise
oriented (rotated 90 degrees or at other orientations)
* * * * *