US4919670A
Expired / Lapsed
US
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Modular humeral prosthesis
Assignee: Zimmer Inc
•
Filing: 1988-02-03
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Granted: 1990-04-24
•
Expires: 2008-02-03
Abstract
Abstract A modular humeral prosthetic device comprising a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being tapered from anterior to posterior aspect; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock mechanism disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head mechanism having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head mechanism being less than half the surface of a complete sphere; the head mechanism including a complementary tapered aperture for reversibly receiving the cylindrical lock mechanism in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head mechanism being disposed at or below the collar.
Inventors
- 👤 James L. Dale
- 👤 Brain D. Burkinshaw
- 👤 Wayne Z. Burkhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:50
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/40; A61F2/30767; A61F2/30907; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30574; A61F2002/30604; A61F2002/30616; A61F2/30771; A61F2002/30772; A61F2002/30795; A61F2002/30797; A61F2002/30878; A61F2002/30884; A61F2002/30899; A61F2002/30902; A61F2/4014; A61F2002/4018; A61F2002/4051; A61F2/4059; A61F2002/4062; A61F2310/00; A61F2310/00389; A61F2310/00395; A61F2310/00407
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
189 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being tapered from anterior to posterior aspect; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock means disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head means being less than half the surface of a complete sphere, the head means including a complementary tapered central aperture for reversibly receiving the cylindrical lock means in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head means being disposed at or below the collar.
Claim 2
Dependent Claim
189 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being tapered from anterior to posterior aspect; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock means disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head means being less than half the surface of a complete sphere, the head means including a complementary tapered central aperture for reversibly receiving the cylindrical lock means in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head means being disposed at or below the collar.
Claim 3
Dependent Claim
36 words
The device according to claim 1 wherein the central axis of the proximal end surface is disposed at an angle of between about 42 and about 48 degrees relative to the axis of the distal end.
Claim 4
Dependent Claim
37 words
The device according to claim 1 wherein the proximal end of the stem includes a fin protruding from the lateral aspect of the proximal end, the fin gradually increasing in lateral protrusion from distal to proximal end.
Claim 5
Dependent Claim
186 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being trapezoidal in cross section; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock means disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head means being less than half the surface of a complete sphere; the head means including a complementary tapered aperture for reversibly receiving the cylindrical lock means in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head means being disposed at or below the collar.
Claim 6
Dependent Claim
186 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being trapezoidal in cross section; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock means disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head means being less than half the surface of a complete sphere; the head means including a complementary tapered aperture for reversibly receiving the cylindrical lock means in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head means being disposed at or below the collar.
Claim 7
Dependent Claim
36 words
The device according to claim 4 wherein the central axis of the proximal end surface is disposed at an angle of between about 42 and about 48 degrees relative to the axis of the distal end.
Claim 8
Dependent Claim
37 words
The device according to claim 4 wherein the proximal end of the stem includes a fin protruding from the lateral aspect of the proximal end, the fin gradually increasing in lateral protrusion from distal to proximal end.
Claim 9
Dependent Claim
194 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being tapered from anterior to posterior aspect and trapezoidal in cross section; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending outwardly from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock means disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head means being less than half the surface of a complete sphere; the head means including a complementary tapered aperture for reversibly receiving the cylindrical lock means in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head means being disposed at or below the collar.
Claim 10
Dependent Claim
194 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being tapered from anterior to posterior aspect and trapezoidal in cross section; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending outwardly from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock means disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head means being less than half the surface of a complete sphere; the head means including a complementary tapered aperture for reversibly receiving the cylindrical lock means in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head means being disposed at or below the collar.
Claim 11
Dependent Claim
36 words
The device according to claim 7 wherein the central axis of the proximal end surface is disposed at an angle of between about 42 and about 48 degrees relative to the axis of the distal end.
Claim 12
Dependent Claim
37 words
The device according to claim 8 wherein the proximal end of the stem includes a fin protruding from the lateral aspect of the proximal end, the fin gradually increasing in lateral protrusion from distal to proximal end.
Claim 13
Dependent Claim
26 words
The device according to claim 8 wherein the theoretical radius of the spherically shaped head means ranges from between about 0.5 inches and about 1.5 inches.
Claim 14
Dependent Claim
27 words
The device according to claim 8 wherein the length of the substantially cylindrical end of the stem ranges from between about 3.20 inches and about 6.10 inches.
Claim 15
Dependent Claim
13 words
The device according to claim 8 wherein the collar has a cloverleaf shape.
Claim 16
Dependent Claim
20 words
The device according to claim 8 wherein the collar includes a porous coating for promoting fixation of natural bone thereto.
Claim 17
Dependent Claim
38 words
The device according to claim 8 wherein a major portion of the anterior and posterior surfaces and the medial radius surface of the proximal end of the stem includes a porous coating for promoting fixation of bone thereto.
Claim 18
Dependent Claim
17 words
The device according to claim 8 wherein the outer spherically shaped surface of the head is polished.
Claim 19
Dependent Claim
141 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end and a widened proximal end; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a male taperlock means protruding from the center of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the head means including a central female taperlock means for receiving and engaging the male taperlock means in a rigid mechanical coupling engagement; the outer surface of the spherically shaped head means comprising less than half the surface of a complete sphere, the theoretical center of the spherically shaped head means being disposed at or below the proximal end surface when the male and female taperlocks are lockably engaged.
Claim 20
Dependent Claim
141 words
A modular humeral prosthetic device comprising: a humeral stem having a substantially cylindrical distal end and a widened proximal end; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a male taperlock means protruding from the center of the proximal end surface; a head means having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the head means including a central female taperlock means for receiving and engaging the male taperlock means in a rigid mechanical coupling engagement; the outer surface of the spherically shaped head means comprising less than half the surface of a complete sphere, the theoretical center of the spherically shaped head means being disposed at or below the proximal end surface when the male and female taperlocks are lockably engaged.
Claim 21
Dependent Claim
17 words
The device according to claim 16 wherein the proximal end has a trapezoidal shape in cross section.
Claim 22
Dependent Claim
20 words
The device according to claim 16 wherein the proximal end has a tapered shape in the anterior to posterior direction.
Claim 23
Dependent Claim
20 words
The device according to claim 16 wherein the proximal end includes a collar extending outwardly from the proximal end surface.
Claim 24
Dependent Claim
117 words
A modular humeral prosthetic device comprising: A humeral stem having a substantially cylindrical distal end and a widened proximal end; the proximal end having an end surface disposed at an angle of between 42 and about 48 degrees relative to the axis of the distal end; and male taperlock means protruding from the center of the proximal end surface; a head means having an outer surface comprising a substantially spherical shape having less than half the surface of a complete sphere, the outer surface for engagement within the glenoid cavity of a human scapula, the head means including a central female taperlock means for receiving and engaging the male taperlock means in a rigid mechanical coupling engagement.
Claim 25
Dependent Claim
117 words
A modular humeral prosthetic device comprising: A humeral stem having a substantially cylindrical distal end and a widened proximal end; the proximal end having an end surface disposed at an angle of between 42 and about 48 degrees relative to the axis of the distal end; and male taperlock means protruding from the center of the proximal end surface; a head means having an outer surface comprising a substantially spherical shape having less than half the surface of a complete sphere, the outer surface for engagement within the glenoid cavity of a human scapula, the head means including a central female taperlock means for receiving and engaging the male taperlock means in a rigid mechanical coupling engagement.
Claim 26
Dependent Claim
34 words
The device according to claim 20 wherein the theoretical center of the spherically shaped head means is disposed at or below the proximal end surface when the male and female taperlocks are lockably engaged.
References Cited (Backward Citations)
DE2015324A1
Cited
DE2400650A1
Cited
US4004300A
Cited
US4430761A
Cited
US4406023A
Cited
DE3415934A1
Cited
FR2567019A1
Cited
FR2579454A1
Cited
SU1279629A1
Cited
US4865605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |