WO1998051228A1 - Retractable intramedullary nail - Google Patents
Retractable intramedullary nail Download PDFInfo
- Publication number
- WO1998051228A1 WO1998051228A1 PCT/GB1998/001346 GB9801346W WO9851228A1 WO 1998051228 A1 WO1998051228 A1 WO 1998051228A1 GB 9801346 W GB9801346 W GB 9801346W WO 9851228 A1 WO9851228 A1 WO 9851228A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casing
- drive means
- nail
- fin
- intramedullary
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
- A61B17/7258—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone
- A61B17/7266—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone with fingers moving radially outwardly
Definitions
- the present invention relates to a retractable intramedullary nail for the fixation of fractures particularly m long bones, and which incorporates a mechanism for expansion to achieve secure fixation of the nail in the intramedullary canal which fixation can be reversed if necessary to allow removal of the nail.
- Intramedullary nails are commonly used to join fractured long bones to enable such fractured bones to unite. In order to perform this function, the nail must be securely fixed within the medullary space. However it may oe necessary to remove the nail subsequently, for example to treat infection at or around the fracture site. This has proved difficult to do with commonly utilized nails.
- such fins are so formed that they allow a minimum of space for over growth of bone and that when such bone has been formed, the fins are sufficiently thin such that overgrown bone is crushed or cut readily during movement of the fin from the expanded or second position to the first or m register position during withdrawal of the nail.
- t is an ob ect of the invention to provide a retractable intramedullary nail which comprises expandable elements which may be driven into their expanded condition and driven from their expanded position into register with the casing in which they are housed. Further, it is an object of the present invention to provide fins which may be driven from the second expanded position to the first in register position even when bone overgrowth has occurred.
- an intramedullary nail comprising an elongate casing adapted to interfit in an intramedullary space, at least one locking element movable between a first position in register with the casing and a second position extending outwardly therefrom, and a drive means therefor; characterized in that the locking element is actuatable by the drive means to move from the first to the second position and subsequently from the second to the first position .
- the locking element is generally fin shaped and may be caused to move between the first and second positions by axial movement of the drive means within the casing .
- the drive means may comprise at least one block which is a close sliding fit within the casing and which is driven by a screw thread.
- the casing and the block are both of a circular cross section.
- the fin may be pivoted to the drive means and may comprise an inclined plane which is in operative connection with the corresponding inclined plane in the casing. Axial movement of the drive means will then cause the inclined surfaces of the fin and the casing to slide over one another to cause the fin to move from its first to its second position .
- the end of the fin remote from the inclined plane may be adapted, when the drive means 98/51228
- the drive means are conveniently placed either axially in the casing or are positioned perpendicular to the casing and generally intermediate the length thereof.
- a number of blocks can be provided so as to provide an intramedullary nail of any unit length.
- a method of positioning a intramedullary nail in a fractured bone which comprises :- forming intramedullary apertures to accommodate the nail generally along the axis of the parts to be joined; inserting an intramedullary nail as described above into both intramedullary apertures; and operating the drive means to cause locking elements in said nail to expand from the casing thereby to reversibly lock the nail into the intramedullary cavities.
- Figure 1 shows a vertical cross section through an intramedullary nail in a first position in accordance with the present invention
- Figure 2 shows a vertical cross section through the intramedullary nail of Figure 1 in a second position.
- Figure 3 shows an end view of the intramedullary nail of Figure 1; and Figure 4 shows a transverse cross section through a line AA of Figure 1.
- a retractable intramedullary nail 1 is formed of a generally elongate casing
- the casing 3 is hollow and is formed with a first end plate 4 and a second end plate 5 forming a unitary element.
- the casing and the element do not themselves expand or retract.
- two blocks, 2 and 2' are provided as a close sliding fit within the hollow casing.
- the blocks 2 are driven by means respectively of an outer screw threaded drive 7 and an inner screw threaded drive 7 ' , whereby each block is axially moveable over a short distance in either direction.
- Each block 2 and 2' is formed with a pivot slot 13 extending transverse of the axis of the respective block.
- each fin 6 In the at rest position of the device as shown in Figure 1 and adjacent each pivot slot 13, is a longitudinally extending slot through the casing 3 through which passes each fin 6.
- Three fins 6 are circumferentially spaced around the periphery of the casing 3 at the two axial locations shown in Figure 1.
- the shape of the fin 6 is shown in Figure 1 and comprises an elongate knife shaped member 6 to which is attached, a pivot 12 which cooperates in the pivot slot 13 in the block 2.
- the fin 6 terminates at one end in an inclined plane 15 which cooperates with a corresponding inclined plane
- the inclined plane 14 of the casing may be concave in a preferred embodiment.
- abutment surfaces of the casing 16 Remote from the inclined planes 14 and 15 on the fins 6 are abutment surfaces of the casing 16 which in position of Figure 1 abut the cooperating surfaces 17 on the fins.
- FIG. 1 shows the arrangement to Figure 1 shows the two screw elements 7 and 7' extending into end plate 4, in another embodiment of the present invention a screw elements 7 is disposed perpendicular to the axis of the elongate casing and intermediate to the length thereof.
- this screw threaded members are intended to move the blocks axially between fixed positions and this can equally well be achieved by normal mechanical means perpendicular to the axis, and indeed in some circumstances there is some virtue in this last arrangement.
- a drive means is positioned intermediate the length of the casing and is provided with a worm drive element (not shown) .
- the drive means 7 are replaced by a screw threaded bar which has oppositely handed screw threads in each direction.
- the worm drive acts on one of these so as to cause rotation of the screw drive means 7 causing the blocks 2 to move apart and towards each other.
- This arrangement is also useful where more than two blocks are utilized since any number of blocks can be moved reciprocally utilizing this arrangement from one screw threaded drive means.
- an intramedullary apertura is formed in each fractured shank utilizing a surgical drill in accordance with usual surgical practice.
- the intramedullary nail in accordance with the present invention is then slid into the aperture in which it is a tight but sliding fit.
- the left hand block 2' is driven by a screw 7' and accordingly with this end positioned in the intramedullary cavity or aperture, a screwdriver of a small diameter is applied to the head of the screw 7' and rotated such that the block 2' moves to the left of Figure 1 to the position shown in Figure 2. This causes the inclined plane 15 of the fin 6 to move up the inclined plane 14 of the casing 3.
- the fin 6 Since the amount of travel of the fin 6 is relatively small in order to cause satisfactory fixation, the fin 6 is then fully deployed in the position shown in Figure 2 until only undue pressure on the screw head 7' will drive it further.
- the other end of the intramedullary nail 1 is positioned in a channel in the other shank and the screw head 7 is operated with a broader diameter screwdriver in the same way as previously described for block 2 1 .
- the fully sterilized nail may be positioned between broken shanks of the bone and normally will stay in si tu while the bone grows thereover and incorporates this into the limb or upper portion of the body.
- infection starts in the medullary cavity. In such circumstances, it is necessary to remove the intramedullary nail, a process which is currently done crudely.
- the fins 6 are of a generally knife-like configuration and may indeed be provided with edge portions forming the inclined plane 15. This feature allows the fin portion 6 to cut through any ingrowing bone even sometime after the intramedullary nail has been positioned thereby ensuring that the expansion of the intramedullary nail in accordance with the present invention does not impeded its removal if necessary.
- the positioning of the drive head 7 and 7' can be inconvenient at the axial end of the device.
- a single screw head with attendant single drive intermediate the length of the casing and extending generally perpendicular to the axis thereof may be considered appropriate.
- This may be used with a left and right handed threaded drive bar so that operation of the screw head in a first direction causes both blocks to move apart to cause expansion or together to cause retraction.
- the invention therefore provides a retractable intramedullary nail and a method for its use.
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98920672A EP0984732A1 (en) | 1997-05-12 | 1998-05-12 | Retractable intramedullary nail |
AU73459/98A AU7345998A (en) | 1997-05-12 | 1998-05-12 | Retractable intramedullary nail |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9709509.5 | 1997-05-12 | ||
GBGB9709509.5A GB9709509D0 (en) | 1997-05-12 | 1997-05-12 | Retractable intramedullary nail |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998051228A1 true WO1998051228A1 (en) | 1998-11-19 |
Family
ID=10812108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/001346 WO1998051228A1 (en) | 1997-05-12 | 1998-05-12 | Retractable intramedullary nail |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0984732A1 (en) |
AU (1) | AU7345998A (en) |
GB (1) | GB9709509D0 (en) |
WO (1) | WO1998051228A1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000025690A1 (en) * | 1998-10-30 | 2000-05-11 | Ian Ross Griggs | Fixation device |
WO2004026158A1 (en) * | 2002-09-20 | 2004-04-01 | Ian Ross Griggs | Fixation device |
EP1582164A1 (en) * | 2004-03-31 | 2005-10-05 | Orthofix International B.V. | Intramedullary nail comprising a stem whereon longitudinal portions are provided driving elements of shape-memory material |
WO2006079184A1 (en) * | 2005-01-31 | 2006-08-03 | Ian Ross Griggs | Improved intramedullary bone device |
AU2003260167B2 (en) * | 2002-09-20 | 2007-09-06 | Ian Ross Griggs | Fixation device |
WO2009055028A2 (en) * | 2007-10-23 | 2009-04-30 | Arch Day Design, Llc | Shape-changing anatomical anchor |
US8012155B2 (en) | 2009-04-02 | 2011-09-06 | Zimmer, Inc. | Apparatus and method for prophylactic hip fixation |
US8545499B2 (en) | 2009-09-28 | 2013-10-01 | Zimmer, Inc. | Expandable intramedullary rod |
ITUB20154732A1 (en) * | 2015-10-20 | 2017-04-20 | Univ Degli Studi Di Messina | ENDOMIDOLLAR PROSTHESIS. |
WO2017087918A1 (en) * | 2015-11-20 | 2017-05-26 | Globus Medical, Inc. | Expandable intramedullary systems and methods of using the same |
EP3281593A1 (en) * | 2016-08-12 | 2018-02-14 | Sota Orthopaedics Limited | An orthopaedic device |
CN107811696A (en) * | 2017-11-10 | 2018-03-20 | 唐佩福 | The locking device of bone fixation pin |
CN113606232A (en) * | 2021-06-29 | 2021-11-05 | 中建七局建筑装饰工程有限公司 | Double-end expansion connecting part |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2542263A1 (en) * | 1975-09-23 | 1977-03-24 | Christian Lassen | Osteo synthetic pin for bone fractures - has slotted ends which are expanded by screwed spindle |
US4590930A (en) * | 1983-06-22 | 1986-05-27 | Lloyd A. Kurth | Fixation device and process for an intramedullary nail |
DE3608163A1 (en) * | 1986-03-12 | 1987-09-24 | Walter A Dr Med Laabs | Device for dynamically/rigidly locking the distal and proximal parts of fractured bones |
US5057103A (en) * | 1990-05-01 | 1991-10-15 | Davis Emsley A | Compressive intramedullary nail |
-
1997
- 1997-05-12 GB GBGB9709509.5A patent/GB9709509D0/en active Pending
-
1998
- 1998-05-12 EP EP98920672A patent/EP0984732A1/en not_active Withdrawn
- 1998-05-12 WO PCT/GB1998/001346 patent/WO1998051228A1/en not_active Application Discontinuation
- 1998-05-12 AU AU73459/98A patent/AU7345998A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2542263A1 (en) * | 1975-09-23 | 1977-03-24 | Christian Lassen | Osteo synthetic pin for bone fractures - has slotted ends which are expanded by screwed spindle |
US4590930A (en) * | 1983-06-22 | 1986-05-27 | Lloyd A. Kurth | Fixation device and process for an intramedullary nail |
DE3608163A1 (en) * | 1986-03-12 | 1987-09-24 | Walter A Dr Med Laabs | Device for dynamically/rigidly locking the distal and proximal parts of fractured bones |
US5057103A (en) * | 1990-05-01 | 1991-10-15 | Davis Emsley A | Compressive intramedullary nail |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6447513B1 (en) | 1998-10-30 | 2002-09-10 | Ian Ross Griggs | Fixation device |
WO2000025690A1 (en) * | 1998-10-30 | 2000-05-11 | Ian Ross Griggs | Fixation device |
WO2004026158A1 (en) * | 2002-09-20 | 2004-04-01 | Ian Ross Griggs | Fixation device |
AU2003260167B2 (en) * | 2002-09-20 | 2007-09-06 | Ian Ross Griggs | Fixation device |
EP1582164A1 (en) * | 2004-03-31 | 2005-10-05 | Orthofix International B.V. | Intramedullary nail comprising a stem whereon longitudinal portions are provided driving elements of shape-memory material |
US8034054B2 (en) | 2005-01-31 | 2011-10-11 | Ian Ross Griggs | Intramedullary bone device |
WO2006079184A1 (en) * | 2005-01-31 | 2006-08-03 | Ian Ross Griggs | Improved intramedullary bone device |
WO2009055028A2 (en) * | 2007-10-23 | 2009-04-30 | Arch Day Design, Llc | Shape-changing anatomical anchor |
WO2009055028A3 (en) * | 2007-10-23 | 2009-07-23 | Arch Day Design Llc | Shape-changing anatomical anchor |
US8012155B2 (en) | 2009-04-02 | 2011-09-06 | Zimmer, Inc. | Apparatus and method for prophylactic hip fixation |
US8545499B2 (en) | 2009-09-28 | 2013-10-01 | Zimmer, Inc. | Expandable intramedullary rod |
ITUB20154732A1 (en) * | 2015-10-20 | 2017-04-20 | Univ Degli Studi Di Messina | ENDOMIDOLLAR PROSTHESIS. |
WO2017087918A1 (en) * | 2015-11-20 | 2017-05-26 | Globus Medical, Inc. | Expandable intramedullary systems and methods of using the same |
EP3281593A1 (en) * | 2016-08-12 | 2018-02-14 | Sota Orthopaedics Limited | An orthopaedic device |
WO2018029374A1 (en) * | 2016-08-12 | 2018-02-15 | Sota Orthopaedics Limited | An orthopaedic device |
US11259854B2 (en) | 2016-08-12 | 2022-03-01 | Sota Orthopaedics Limited | Orthopaedic device |
CN107811696A (en) * | 2017-11-10 | 2018-03-20 | 唐佩福 | The locking device of bone fixation pin |
CN107811696B (en) * | 2017-11-10 | 2024-03-08 | 中国人民解放军总医院 | Locking device for bone fixation needle |
CN113606232A (en) * | 2021-06-29 | 2021-11-05 | 中建七局建筑装饰工程有限公司 | Double-end expansion connecting part |
Also Published As
Publication number | Publication date |
---|---|
EP0984732A1 (en) | 2000-03-15 |
AU7345998A (en) | 1998-12-08 |
GB9709509D0 (en) | 1997-07-02 |
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