Helical interlocking mating guide and advancement structure
OwnerRoger P. Jacksoninventor
Life of this patent
Estimating the term…
Abstract
A structure including a pair of helically wound interlocking forms located on a cylindrical closure for an open headed medical implant and in a receiver between arms of the implant respectively. The interlocking forms each include overlapping gripping elements that engage mating elements during assembly to prevent radial splaying of arms of the implant.
Claims39
A medical implant having an open receiver member with spaced arms and a closure member having an axis of rotation for closing the receiver member;
- said implant further comprising:
- a) helically wound and mateable first and second interlocking forms;
- said first interlocking form being mounted on an outer surface of said closure member;
- b) said second interlocking form being mounted on an interior surface of said receiver member;
- said first and second interlocking forms being rotatable upon assembly of said closure member into said receiver member;
- said first and second interlocking members guiding and advancing said closure member into said receiver upon rotation of said closure member;
- c) said first and second interlocking forms each having a cross section, taken in a plane passing through said axis, that is uniform along a substantial length thereof;
- and
- d) said interlocking forms operably resisting radial splaying of said arms during assembly and subsequent use of said implant.
A medical implant having an open receiver member with spaced arms and a closure member having an axis of rotation for closing the receiver member;
- said implant further comprising:
- a) helically wound and mateable first and second interlocking forms;
- said first interlocking form being mounted on an outer surface of said closure member;
- b) said second interlocking form being mounted on an interior surface of said receiver member;
- said first and second interlocking forms being rotatable at least one full turn with respect to one another upon assembly of said closure member into said receiver member;
- said first and second interlocking members guiding and advancing said closure member into said receiver upon rotation of said closure member;
- and
- c) said interlocking forms operably resisting radial splaying of said arms during assembly and subsequent use of said implant.
In a device wherein a receiver having a pair of spaced sides rotatably receives a closure for closing at least part of the receiver;
- the improvement comprising:
- a) a first helically wound interlocking form on said closure;
- b) a second helically wound interlocking form on said receiver;
- and
- c) said first and second interlocking forms mating upon said closure being rotated into said receiver and operably preventing substantial radial splaying of said receiver sides while said closure is positioned within said receiver.
A guide and advancement structure having first and second interlocking forms wound helically about a common axis during usage, said interlocking forms being located on and enabling engagement and rotational advancement of a first member with respect to a second member respectively, a first of said members being adapted to be an inner member and a second of said members being adapted to be an outer member, and each of said interlocking forms comprising:
- a) a first surface extending along a respective interlocking form and adapted to engage a complementary second surface of said second member upon rotating together of said first member relative to said second member;
- and
- b) said first surface having a compound contour thereon such that a grip portion of said first surface is oriented in such a direction relative to said axis so as to resist, by engagement of said first surface with said second surface, a radial splaying of said outer member during assembly of said first member into said second member.
A structure including first and second interlocking forms mounted on first and second members respectively and extending helically about a common axis, when joined, providing for engagement and advancement of said first member with respect to said second member, said first member being an inner member with said first interlocking form mounted thereon as an external interlocking form and said second member being an outer member with said second interlocking form mounted thereon as an internal interlocking form, wherein:
- a) a first surface extends along said external interlocking form on said first member and is adapted to engage a complementary second surface extending along said internal interlocking form of said second member upon engagement and rotation of said first member with respect to said second member;
- b) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- and
- c) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented generally to face away from said axis so as to overlap said first grip portion to thereby resist radially outward spaying of a parts of said outer member.
In a medical implant a structure for providing for rotation, guidance and advancement of a first cylindrical closure member in a second receiver member;
- the improvement in the structure comprising:
- a) first and second helically wound and mateable interlocking forms;
- said first interlocking form extending radially outward from said closure member and said second interlocking form extending radially inward from said receiving member;
- said closure member having an axis of rotation;
- said first and second interlocking forms being coaxial with said axis during assembly of said closure member into said receiving member;
- b) a first surface extending along said first interlocking form and adapted to engage and overlap a complementary second surface extending along said second interlocking form upon engagement and rotation of said closure member with said receiving member such that the first and second interlocking forms slide tangentially upon rotation and mate;
- c) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- d) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented to face generally away from said axis and so as to directly face said first grip position to thereby resist radially outward splaying of a portion of said receiving member;
- e) said first interlocking form including a first root and a first crest extending helically about said axis to alternatingly form a first root and a first crest;
- said first crest having a radius greater than said first root;
- f) said first grip portion including a grip bead projecting from said first surface in a direction substantially parallel to said axis;
- g) said grip bead being positioned at a location spaced from said first root;
- h) said second interlocking form including a second root and a second crest extending helically about said interlocking form axis to alternatingly form a second root and a second crest;
- said second root having a radius greater than said second crest;
- i) said second grip portion including a grip channel formed into said second surface;
- and
- j) said grip channel being positioned generally to mate with said grip bead during assembly of said closure member into said receiving member.
A first helically wound interlocking form and a second helically wound mating interlocking form having a portion thereof on a pair of spaced walls;
- said first interlocking form having a trailing surface that engages said second mating interlocking form with a mating surface, wherein:
- a) said trailing and mating surfaces are radially non-linear so that said trailing surface lockingly engages said mating surface, when joined, to resist outward relative splaying of the spaced walls.
A first helically wound interlocking form and a second helically wound mating interlocking form having portions on a pair of spaced walls;
- said first interlocking form having a leading surface that engages said second mating interlocking form with a mating surface, wherein:
- a) said leading and mating surfaces are radially non-linear so that said leading surface lockingly engages said mating surface, when joined, to resist outward relative splaying of the spaced walls.
A guide and advancement structure having first and second interlocking forms wound helically about a common axis during usage, said interlocking forms being located on and enabling engagement and rotational advancement of a first member with respect to a second member respectively, a first of said members being adapted to be an inner member and a second of said members being adapted to be an outer member, and each of said interlocking forms comprising:
- a) a first surface extending along a respective interlocking form and adapted to engage a complementary second surface of said second member upon rotating together of said first member relative to said second member;
- b) said first surface having a compound contour thereon such that a grip portion of said first surface is oriented in such a direction relative to said axis so as to resist, by engagement of said first surface with said second surface, a radial splaying of said outer member during assembly of said first member into said second member;
- and wherein
- c) said first interlocking form extends radially outward from said first inner member and said second interlocking form extends radially inward from said second outer member;
- d) said first interlocking form includes a root and a crest extending helically about said axis to form an alternating root and crest, said crest having a radius greater than said root;
- and
- e) said first interlocking form has a greater cross sectional area in a region spaced radially outward of said root than adjacent said root.
A guide and advancement structure having first and second interlocking forms wound helically about a common axis during usage, said interlocking forms being located on and enabling engagement and rotational advancement of a first member with respect to a second member respectively, a first of said members being adapted to be an inner member and a second of said members being adapted to be an outer member, and each of said interlocking forms comprising:
- a) a first surface extending along a respective interlocking form and adapted to engage a complementary second surface of said second member upon rotating together of said first member relative to said second member;
- b) said first surface having a compound contour thereon such that a grip portion of said first surface is oriented in such a direction relative to said axis so as to resist, by engagement of said first surface with said second surface, a radial splaying of said outer member during assembly of said first member into said second member;
- c) said first interlocking form is formed as an external interlocking form on said first inner member;
- d) said first interlocking form including a root and a crest extending helically about said axis to form an alternating root and crest, said crest having a radius greater than said root;
- e) said grip portion including a rounded grip bead projecting from said first surface in a direction substantially parallel to said axis;
- and
- f) said grip bead being located medially between said root and said crest on said first surface.
A guide and advancement structure having first and second interlocking forms wound helically about a common axis during usage, said interlocking forms being located on and enabling engagement and rotational advancement of a first member with respect to a second member respectively, a first of said members being adapted to be an inner member and a second of said members being adapted to be an outer member, and each of said interlocking forms comprising:
- a) a first surface extending along a respective interlocking form and adapted to engage a complementary second surface of said second member upon rotating together of said first member relative to said second member;
- b) said first surface having a compound contour thereon such that a grip portion of said first surface is oriented in such a direction relative to said axis so as to resist, by engagement of said first surface with said second surface, a radial splaying of said outer member during assembly of said first member into said second member;
- c) said second interlocking form is formed as an internal interlocking form on said second outer member;
- d) said interlocking form includes a root and a crest extending helically about said axis to alternatingly form a root and a crest, said root having a radius greater than said crest;
- and
- e) said second interlocking form has a greater cross sectional area located in a region radially inward of said root toward said axis than adjacent said root.
A guide and advancement structure having first and second interlocking forms wound helically about a common axis during usage, said interlocking forms being located on and enabling engagement and rotational advancement of a first member with respect to a second member respectively, a first of said members being adapted to be an inner member and a second of said members being adapted to be an outer member, and each of said interlocking forms comprising:
- a) a first surface extending along a respective interlocking form and adapted to engage a complementary second surface of said second member upon rotating together of said first member relative to said second member;
- and
- b) said first surface having a compound contour thereon such that a grip portion of said first surface is oriented in such a direction relative to said axis so as to resist, by engagement of said first surface with said second surface, a radial splaying of said outer member during assembly of said first member into said second member;
- c) said second interlocking form is formed as an internal interlocking form on said second outer member;
- and
- d) said grip portion of said first surface faces generally away from said axis.
A guide and advancement structure having first and second interlocking forms wound helically about a common axis during usage, said interlocking forms being located on and enabling engagement and rotational advancement of a first member with respect to a second member respectively, a first of said members being adapted to be an inner member and a second of said members being adapted to be an outer member, and each of said interlocking forms comprising:
- a) a first surface extending along a respective interlocking form and adapted to engage a complementary second surface of said second member upon rotating together of said first member relative to said second member;
- and
- b) said first surface having a compound contour thereon such that a grip portion of said first surface is oriented in such a direction relative to said axis so as to resist, by engagement of said first surface with said second surface, a radial splaying of said outer member during assembly of said first member into said second member;
- c) said second interlocking form being formed as an internal interlocking form on said second outer member;
- d) said interlocking form including a root and a crest extending helically about said axis to alternatingly form a root and a crest, said root having a radius greater than said crest;
- e) said grip portion including a rounded grip channel formed into said first surface, said grip channel being formed by a generally concave arcuate surface;
- and
- f) said grip channel being positioned radially from said root and medially with respect to said root and said crest of said first surface.
A structure including first and second interlocking forms mounted on first and second members respectively and extending helically about a common axis, when joined, providing for engagement and advancement of said first member with respect to said second member, said first member being an inner member with said first interlocking form mounted thereon as an external interlocking form and said second member being an outer member with said second interlocking form mounted thereon as an internal interlocking form, wherein:
- a) a first surface extends along said external interlocking form on said first member and is adapted to engage a complementary second surface extending along said internal interlocking form of said second member upon engagement and rotation of said first member with respect to said second member;
- b) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- c) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented generally to face away from said axis so as to overlap said first grip portion to thereby resist, radially outward spaying of a parts of said outer member;
- d) said external interlocking form including a root and a crest extending helically about said axis to form an member with respect to said second member, said first member being an inner member with said first interlocking form mounted thereon as an external interlocking form and said second member being an outer member with said second interlocking form mounted thereon as an internal interlocking form, wherein:
- a) a first surface extends along said external interlocking form on said first member and is adapted to engage a complementary second surface extending along said internal interlocking form of said second member upon engagement and rotation of said first member with respect to said second member;
- b) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- c) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented generally to face away from said axis so as to overlap said first grip portion to thereby resist, radially outward spaying of a parts of said outer member;
- d) said external interlocking form including a root and a crest extending helically about said axis to form an alternating root and crest, said crest having a radius greater than said root;
- and
- e) said external interlocking form having a greater cross sectional area parallel to said axis at a location spaced radially outward of said root than adjacent said root.
A structure including first and second interlocking forms mounted on first and second members respectively and extending helically about a common axis, when joined, providing for engagement and advancement of said first member with respect to said second member, said first member being an inner member with said first interlocking form mounted thereon as an external interlocking form and said second member being an outer member with said second interlocking form mounted thereon as an internal interlocking form, wherein:
- a) a first surface extends along said external interlocking form on said first member and is adapted to engage a complementary second surface extending along said internal interlocking form of said second member upon engagement and rotation of said first member with respect to said second member;
- b) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- c) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented generally to face away from said axis so as to overlap said first grip portion to thereby resist, radially outward spaying of a parts of said outer member;
- d) said external interlocking form including a root and a crest extending helically about said axis to alternatingly form a root and a crest, said crest having a radius greater than said root;
- e) said first grip portion including a rounded grip bead projecting from said first surface in a direction substantially parallel to said axis;
- and
- f) said grip bead being positioned medially between said root and said crest on said first surface.
A structure including first and second interlocking forms mounted on first and second members respectively and extending helically about a common axis, when joined, providing for engagement and advancement of said first member with respect to said second member, said first member being an inner member with said first interlocking form mounted thereon as an external interlocking form and said second member being an outer member with said second interlocking form mounted thereon as an internal interlocking form, wherein:
- a) a first surface extends along said external interlocking form on said first member and is adapted to engage a complementary second surface extending along said internal interlocking form of said second member upon engagement and rotation of said first member with respect to said second member;
- b) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- c) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented generally to face away from said axis so as to overlap said first grip portion to thereby resist, radially outward spaying of a parts of said outer member;
- d) said internal interlocking form including a root and a crest extending helically about said axis to alternatingly form a root and a crest, said root having a radius greater than said crest;
- and
- e) said internal interlocking form having a greater cross sectional area at a location radially inward of said root toward said axis than adjacent said root.
A structure including first and second interlocking forms mounted on first and second members respectively and extending helically about a common axis, when joined, providing for engagement and advancement of said first member with respect to said second member, said first member being an inner member with said first interlocking form mounted thereon as an external interlocking form and said second member being an outer member with said second interlocking form mounted thereon as an internal interlocking form, wherein:
- a) a first surface extends along said external interlocking form on said first member and is adapted to engage a complementary second surface extending along said internal interlocking form of said second member upon engagement and rotation of said first member with respect to said second member;
- b) said first surface having a first compound contour including a first grip portion which is oriented generally to face toward said axis;
- c) said second surface having a second compound contour which is complementary to said first compound contour and which includes a second grip portion which is oriented generally to face away from said axis so as to overlap said first grip portion to thereby resist, radially outward spaying of a parts of said outer member;
- d) said internal interlocking form including a root and a crest extending helically about said axis to alternatingly form a root and a crest, said root having a radius greater than said crest;
- e) said second grip portion including a rounded grip channel formed into said second surface;
- and
- f) said grip channel being positioned medially between said root and said crest on said second surface.
A method for resisting arm splaying in a bone screw having a head with a pair of spaced arms;
- said method comprising the steps of:
- a) providing a closure that is sized and shaped to be located between said arms;
- b) placing a portion of a first interlocking and helical wound form on facing sides of each of said arms;
- c) placing a second interlocking helical wound form on said closure that is sized and shaped to rotatably mate with said first interlocking form;
- and
- d) rotating and advancing said closure between said arms so as to interlockably join said closure to both of said arms.
Dependencies are inferred from the claim text.