Easily implantable and stable nail-fastener for skeletal fixation and method

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for threadedly engaging said bore (34) of said intramedullary nail (20),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) surrounding said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20),
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space, and
• wherein the near cortex hole (40) has a near cortex hole diameter (DNC), said exterior (56) of said compression transmission device (54) has an exterior diameter (DE), and said exterior diameter (DE) is equal to the near cortex hole diameter (DNC) such that said exterior (56) of said compression transmission device (54) engages the cortex (28) along the near cortex hole (40).

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for threadedly engaging said bore (34) of said intramedullary nail (20),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) surrounding said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20),
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space, and
• wherein the near cortex hole (40) has a near cortex hole diameter (DNC), said exterior (56) of said compression transmission device (54) has an exterior diameter (DE), and said exterior diameter (DE) is less than the near cortex hole diameter (DNC) such that said compression transmission device (54) and the cortex (28) provide a space therebetween.

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for threadedly engaging said bore (34) of said intramedullary nail (20),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) surrounding said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20),
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space, and
• wherein the cortex (28) includes a far cortex hole (42) having a far cortex hole diameter (DFC), said threaded portion (50) of said threaded fastener (22) extends into the far cortex hole (42), said threaded portion (50) has a threaded portion diameter (DTP), and said threaded portion diameter (DTP) along the far cortex hole (42) is less than the far cortex hole diameter (DFC) such that said threaded fastener (22) and the cortex (28) provide a space therebetween.

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for threadedly engaging said bore (34) of said intramedullary nail (20),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) surrounding said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20),
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space, and
• wherein said compression transmission device (54) extends from a device top end (60) to a device bottom end (62), said device top end (60) engages said head (44) of said fastener (22), and said device bottom end (62) engages said intramedullary nail (20).

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for threadedly engaging said bore (34) of said intramedullary nail (20),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) surrounding said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20),
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space, and
• wherein said bore (34) of said intramedullary nail (20) is threaded and has a bore axis (Ab) extending between a near opening (36) and a far opening (38) transverse to said intramedullary nail (20) and presents a bore diameter (DBR), said bore diameter (DBR) includes a central bore diameter (DCBR) disposed centrally between said near opening (36) and said far opening (38) of said bore (34), and said bore diameter (DBR) increases from said central bore diameter (DCBR) to said near opening (36) and from said central bore diameter (DCBR) to said far opening (38) for allowing said fastener axis (A) to be skewed relative to said bore axis (Ab) while remaining threadedly engaged.

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for threadedly engaging said bore (34) of said intramedullary nail (20),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) surrounding said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20),
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space, and
• wherein said bore (34) of said intramedullary nail (20) is threaded and has a bore axis (Ab) extending between a near opening (36) and a far opening (38) transverse to said intramedullary nail (20) and presents a bore diameter (DBR), and said bore diameter (DBR) is consistent from said near opening (36) to said far opening (38).

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a far cortex hole (42), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a threaded fastener (22) including a head (44) and an end (46) with a threaded portion (50) extending along a fastener axis (A) therebetween for extending through said bore (34) of said intramedullary nail (20) and threadedly engaging the cortex (28) along the far cortex hole (42),
• said threaded fastener (22) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said threaded portion (50) and said head (44),
• a compression transmission device (54) extending longitudinally along said fastener axis (A) from a from a device top end (60) to a device bottom end (62),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space, said interior (58) extending continuously from said device top end (60) to said device bottom end (62) and continuously around said fastener axis (A) and said compression portion (48) of said threaded fastener (22),
• said compression transmission device (54) being disposed between said head (44) of said threaded fastener (22) and said intramedullary nail (20), and
• said interior space being greater than said compression portion diameter (DCP) of said fastener (22) for providing space at least partially about said threaded fastener (22) for allowing said fastener axis (A) to be variously disposed relative to said interior space.

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a near cortex hole (40), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a fastener (23) including a head (44) and an end (46) with a first portion (51) extending along a fastener axis (A) therebetween for frictionally engaging said bore (34) of said intramedullary nail (20),
• said fastener (23) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said first portion (51) and said head (44) for extending through the near cortex hole (40) of the bone (24),
• a compression transmission device (54) extending longitudinally along said fastener axis (A) from a from a device top end (60) to a device bottom end (62),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space, said interior (58) extending continuously from said device top end (60) to said device bottom end (62) and continuously around said fastener axis (A) and said compression portion (48) of said fastener (23),
• said compression transmission device (54) being disposed between said head (44) of said fastener (23) and said intramedullary nail (20), and
• said interior space being greater than said compression portion diameter (DCP) of said fastener (23) for providing space at least partially about said fastener (23) for allowing said fastener axis (A) to be variously disposed relative to said interior space.

A nail-fastener apparatus for implantation into the medullary canal (26) surrounded by the cortex (28) of a bone (24) including a far cortex hole (42), comprising:

• an intramedullary nail (20) extending between a top end (30) and a bottom end (32) and defining a bore (34) for insertion into the medullary canal (26),
• a fastener (23) including a head (44) and an end (46) with a first portion (51) extending along a fastener axis (A) therebetween for extending through said bore (34) of said intramedullary nail (20) and frictionally engaging the cortex (28) along the far cortex hole (42),
• said fastener (23) including a compression portion (48) presenting a compression portion diameter (DCP) and extending along said fastener axis (A) between said first portion (51) and said head (44),
• a compression transmission device (54) extending longitudinally along said fastener axis (A) from a from a device top end (60) to a device bottom end (62),
• said compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space, said interior (58) extending continuously from said device top end (60) to said device bottom end (62) and continuously around said fastener axis (A) and said compression portion (48) of said fastener (23),
• said compression transmission device (54) being disposed between said head (44) of said fastener (23) and said intramedullary nail (20), and
• said interior space being greater than said compression portion diameter (DCP) of said fastener (23) for providing space at least partially about said fastener (23) for allowing said fastener axis (A) to be variously disposed relative to said interior space.

A method for implanting an intramedullary nail (20) into the medullary canal (26) surrounded by the cortex (28) of the bone (24) comprising the steps of:

• providing a bore (34) in the intramedullary nail (20) including threads,
• forming a near cortex hole (40) in the cortex (28),
• providing a threaded fastener (22) including a head (44) and an end (46) with a compression portion (48) presenting a compression portion diameter (DCP) and a threaded portion (50) extending along a fastener axis (A) between the head (44) and the end (46),
• providing a compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• disposing the compression transmission device (54) in the near cortex hole (40) and contacting the intramedullary nail (20) with the compression transmission device (54),
• extending the threaded fastener (22) through the compression transmission device (54),
• threadedly engaging the threaded portion (50) of the threaded fastener (22) to the intramedullary nail (20) along the bore (34), and
• providing the compression transmission device (54) with the interior space being greater than the compression portion diameter (DCP) of the threaded fastener (22) for providing space at least partially about the threaded fastener (22) for allowing the fastener axis (A) to be variously disposed relative the interior space.

A method for implanting an intramedullary nail (20) into the medullary canal (26) surrounded by the cortex (28) of the bone (24) comprising the steps of:

• providing a bore (34) in the intramedullary nail (20) including threads,
• forming a far cortex hole (42) in the cortex (28),
• providing a threaded fastener (22) including a head (44) and an end (46) with a compression portion (48) having a compression portion diameter (DCP) and a threaded portion (50) extending along a fastener axis (A) therebetween,
• providing a compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• contacting the intramedullary nail (20) with the compression transmission device (54),
• extending the threaded fastener (22) through the compression transmission device (54) and the bore (34) of the intramedullary nail (20),
• threadedly engaging the threaded portion (50) of the threaded fastener (22) to the cortex (28) along the far cortex hole (42), and
• providing the compression transmission device (54) with the interior space being greater than the compression portion diameter (DCP) of the threaded fastener (22) for providing space at least partially about the threaded fastener (22) for allowing the fastener axis (A) to be variously disposed relative the interior space.

A method for implanting an intramedullary nail (20) into the medullary canal (26) surrounded by the cortex (28) of the bone (24) comprising the steps of:

• providing a bore (34) in the intramedullary nail (20) including threads,
• providing a threaded fastener (22) including a head (44) and an end (46) with a compression portion (48) presenting a compression portion diameter (DCP) and a threaded portion (50) presenting a threaded portion diameter (DTP) extending along a fastener axis (A), wherein the threaded portion (50) is disposed between the compression portion (48) and the end (46) and the compression portion diameter (DCP) is greater than the threaded portion diameter (DTP),
• forming a near cortex hole (40) in the cortex (28) having a near cortex hole diameter (DNC) being greater than the compression portion diameter (DCP),
• extending the threaded fastener (22) through the near cortex hole (40) and into the bore (34) until the compression portion (48) engages the intramedullary nail (20), and
• threadedly engaging the threaded portion (50) of the threaded fastener (22) to the intramedullary nail (20) along the bore (34).

A method for implanting an intramedullary nail (20) into the medullary canal (26) surrounded by the cortex (28) of the bone (24) comprising the steps of:

• providing a bore (34) in the intramedullary nail (20),
• forming a near cortex hole (40) in the cortex (28),
• providing a fastener (23) including a head (44) and an end (46) with a compression portion (48) presenting a compression portion diameter (DCP) and a first portion (51) extending along a fastener axis (A) between the head (44) and the end (46),
• providing a compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• disposing the compression transmission device (54) in the near cortex hole (40) and contacting the intramedullary nail (20) with the compression transmission device (54),
• extending the fastener (23) through the compression transmission device (54),
• frictionally engaging the first portion (51) of the fastener (23) to the intramedullary nail (20) along the bore (34), and
• providing the compression transmission device (54) with the interior space being greater than the compression portion diameter (DCP) of the fastener (23) for providing space at least partially about the fastener (23) for allowing the fastener axis (A) to be variously disposed relative the interior space.

A method for implanting an intramedullary nail (20) into the medullary canal (26) surrounded by the cortex (28) of the bone (24) comprising the steps of:

• providing a bore (34) in the intramedullary nail (20),
• forming a far cortex hole (42) in the cortex (28),
• providing a fastener (23) including a head (44) and an end (46) with a compression portion (48) having a compression portion diameter (DCP) and a first portion (51) extending along a fastener axis (A) therebetween,
• providing a compression transmission device (54) having an exterior (56) and an interior (58) defining an interior space,
• contacting the intramedullary nail (20) with the compression transmission device (54),
• extending the fastener (23) through the compression transmission device (54) and the bore (34) of the intramedullary nail (20),
• frictionally engaging the first portion (51) of the fastener (23) to the cortex (28) along the far cortex hole (42), and
• providing the compression transmission device (54) with the interior space being greater than the compression portion diameter (DCP) of the fastener (23) for providing space at least partially about the fastener (23) for allowing the fastener axis (A) to be variously disposed relative the interior space.