EP3416572A1 - Capuchon de protection a meplats d'une broche d'osteosynthese avec organe pour sa fixation - Google Patents
Capuchon de protection a meplats d'une broche d'osteosynthese avec organe pour sa fixationInfo
- Publication number
- EP3416572A1 EP3416572A1 EP17704235.5A EP17704235A EP3416572A1 EP 3416572 A1 EP3416572 A1 EP 3416572A1 EP 17704235 A EP17704235 A EP 17704235A EP 3416572 A1 EP3416572 A1 EP 3416572A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cap
- flat
- assembly according
- pin
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001681 protective effect Effects 0.000 title abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 5
- 210000000988 bone and bone Anatomy 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 3
- 206010017076 Fracture Diseases 0.000 description 10
- 208000010392 Bone Fractures Diseases 0.000 description 8
- 238000001356 surgical procedure Methods 0.000 description 4
- 210000001519 tissue Anatomy 0.000 description 4
- 239000007943 implant Substances 0.000 description 3
- 210000000457 tarsus Anatomy 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003902 lesion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000001872 metatarsal bone Anatomy 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 230000007170 pathology Effects 0.000 description 2
- 208000003322 Coinfection Diseases 0.000 description 1
- 240000007817 Olea europaea Species 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 208000002607 Pseudarthrosis Diseases 0.000 description 1
- 206010043248 Tendon rupture Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 206010048049 Wrist fracture Diseases 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 208000037873 arthrodesis Diseases 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 210000003010 carpal bone Anatomy 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000002559 palpation Methods 0.000 description 1
- 210000004417 patella Anatomy 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 210000001137 tarsal bone Anatomy 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 208000017013 ulna fracture Diseases 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
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
- A61B17/685—Elements to be fitted on the end of screws or wires, e.g. protective caps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/03—Automatic limiting or abutting means, e.g. for safety
- A61B2090/037—Automatic limiting or abutting means, e.g. for safety with a frangible part, e.g. by reduced diameter
Definitions
- the present invention relates to a protective cap flats of an osteosynthesis pin and an assembly comprising this cap and a fastener of the cap on the spindle.
- EP-A-0 323 429 discloses a locking screw of an osteosynthesis plate for the treatment of fractures.
- This screw comprises a threaded portion, a head and a gripping rod secured to the head via an embrittlement zone formed by a constriction making the rod separable from the head under the effect of a predetermined torque of torsion , at the end of screwing.
- FR-A-2,633,822 discloses an assembly comprising a cap and a fastener of the cap on a pin, the cap having a housing adapted to receive one end of the pin and a tapped hole opening transversely in this housing, adapted to receive a fixing screw for securing the spindle and spherical pin protective tip.
- EP-A-0 543 709 discloses an assembly comprising a cap and a fixing member of the cap on a pin, the cap having a housing adapted to receive one end of the pin and a tapped hole opening transversely in this housing, the handle of the fixing member having a fragile zone in its end part allowing its rupture at the end of screwing and the locking of the cap.
- the invention therefore aims to propose a satisfactory solution to the problem above.
- cap a spindle protective tip that protects the cut portion of the spindle and whose attachment to it is provided by a micro-screwing system. Its role is to protect the sharp end of the spindle, to avoid the migration of the spindle and to allow compression.
- the cap allows easy extraction of the spindle.
- the subject of the invention is an assembly comprising a cap for protecting an osteosynthesis pin, and a fastener for securing the cap on the pin, via an end portion of said fixing member, the cap comprising a housing adapted to receive one end of the spindle, and a tapped hole opening transversely in this housing, adapted to receive a fixing screw extending the end portion and for securing the pin and the cap, the screw having, at its junction with the end of said end portion, a fragile zone that allows its rupture at the end of screwing and its locking in the transverse hole, wherein said cap comprises at least one flat.
- the invention also relates to a sterile protection cap of an osteosynthesis pin, comprising a housing adapted to receive one end of the spindle, and a tapped hole opening transversely in this housing, adapted to receive a fixing screw extending the end portion and for securing the pin and the cap, wherein said cap comprises at least one flat.
- the invention also relates to an assembly comprising a cap for protecting an osteosynthesis pin and an osteosynthesis pin, the cap comprising a housing receiving an end of the pin, and a tapped hole opening transversely in this housing, receiving a fixation screw locked in the transverse hole, said cap being fixed with the osteosynthesis pin, said cap having at least one flat.
- the invention also relates to a method for producing the protective cap and osteosynthesis pin assembly according to the invention, comprising the following steps:
- the length of the osteosynthesis pin is adjusted by cutting.
- the subject of the invention is also a method for extracting the protective cap and osteosynthesis pin assembly according to the invention, comprising the step of gripping the cap at the level of the flats using a pair of forceps, and the application of an extraction force.
- the cap has two flats parallel to each other.
- said at least one flat is parallel to the tapped hole; according to another variant, it is perpendicular to the tapped hole.
- said at least one flat extends over the entire height of the cap; in another variant said at least one flat extends over a portion of the height of the cap and from a shoulder at the base of the cap.
- the fastener of the cap on the spindle is provided with a terminal portion made one-piece with the screw, a weakened fracture zone at the end of screwing being formed between the screw and said end portion.
- the weakened zone is a narrowing of the end portion, forming a neck at the junction with the screw.
- the fixing member is a handle, preferably coated with asperities, for example a knurling.
- the fragile zone is located under the surface of the cap.
- the cap has a bore for receiving a strapping wire of a bone. So we can also predict that the cap is perforated by a bore for sliding the cap on the pin and / or the passage of a strapping wire (including a bone which can also receive a pin, with or without the cap according to the invention.
- the assemblies according to the invention and the cap according to the invention are sterile.
- the present invention overcomes the disadvantages of the state of the art. It provides more particularly an assembly formed by a flattened cap and a fixing member thereof on the spindle. Such a flats cap forms at the end of the spindle a prominence which effectively opposes any unwanted movement of this spindle.
- the cap has flats allowing a stable and strong grip of the pin during extraction without risk of sliding of the clamp. The clamp no longer slipping there is more risk of damaging the tissue around the cap. It is also possible to use a rack-and-pinion clamp which offers additional comfort for the practitioner.
- the locking screw of the flattened cap on the spindle is initially part of its installation tool, which it does not dissociate at the end of screwing, by breaking the weakened zone.
- This arrangement avoids the use of a screwdriver, which would be particularly difficult in the conditions of the surgical procedure and given the small dimensions of the screw and the flattened cap.
- FIG. 1 represents a half-elevation view half-lengthwise on an enlarged scale of a first embodiment of the assembly targeted by the invention, comprising a flatscap and a fastener of the flatscap on the spindle; .
- FIG. 2 shows a mid-sectional mid-elevation view of an embodiment of the enlarged flatscap cap, as well as its fixing screw on the spindle and the end portion of the support member of the screw.
- FIG. 3 is an elevational view of the flattened cap in the direction of arrow F in FIG.
- Figure 4a shows a cross-sectional view along AA of Fig.5 of an embodiment of the flats cap according to the invention.
- Fig. 4b is a cross-sectional view of a second embodiment of the flattened cap according to the invention.
- Figure 5 shows a side view of the cap of Fig.4a.
- Figure 6 shows a sectional view according to a third embodiment of the invention.
- Figure 7 shows a perspective view of the flattened cap according to the invention.
- Figure 8 shows a radiographic view of an application of the invention to the surgical treatment of scaphoid fracture or scaphoid pseudarthrosis.
- the present invention overcomes the disadvantages of the state of the art. It more particularly provides the device shown in FIG. 1 which comprises a cap 1 for protecting an osteosynthesis pin such as 2, a member 3 for fixing the cap 1 on the spindle, this member being provided with a part end 4 supporting the cap 1, and finally a protective cap 5 covering the end portion 4 and the cap 1.
- the cover 5, made for example of any suitable plastic material, has a tubular shape and can be friction-fitted on a cylindrical base 6 coaxial with the end portion 4. This base 6 is extended by a handle 7 of manual handling, the surface is preferably coated with asperities, for example a knurling 8.
- the cap 1 shown in detail in FIGS. 2 and 3, comprises a housing 9 formed by a blind hole adapted to receive one end of the pin 2.
- the cap 1 comprises at least two flats (100, 101). It can also be perforated at its top, for example by a bore.
- the implant cap 1 is furthermore provided a tapped hole 1 1 emerging transversely in the housing 9, and adapted to receive a screw 12 for securing the pin 2 and the cap 1.
- the flats (100, 101) of the cap 1 are located parallel or perpendicular to the tapped hole 1 1, as will be described in more detail with reference to Figures 4a and 4b.
- the hole 1 1 passes right through the cap 1, perpendicular to the axis of the cylindrical housing 9, only its portion for receiving the screw 12 being threaded. It is possible to have only the threaded portion without a hole passing through the entire cap.
- the height of the cap corresponds to the size of the cap from its base to its top. This height is between 2 mm and 6 mmm, preferably between 3 mm and 5 mm.
- the diameter of the cap excluding flats is between 3 mm and 8 mm, preferably between 3 mm and 6 mm.
- the cap may be made of any material suitable for implantation, for example polymer (eg PEEK), and preferably metal, stainless steel in particular, such as 31 6L or titanium Ta6v4.
- polymer eg PEEK
- metal, stainless steel in particular, such as 31 6L or titanium Ta6v4.
- the screw 12 has a head 12a adapted to fit the cylindrical surface of the pin 2 and crash when necessary. It is made one-piece with the end portion 4 of the handle-screw 3, and has, at its junction with the end of this portion 4, a fragile zone (or embrittled, these two terms being used interchangeably) 13 allowing its break in the end screwing and thus the separation of the screw 12 relative to the neck forming the end portion 4.
- the surgeon After having taken out the flattened cap 1 of the cover 5, the surgeon, holding the handle 7 in his hand, approaches the cap 1 of the end of the pin 2 which he introduces into the housing 9, until his tip come to a stop on the bottom of this dwelling.
- the length of the pin was possibly previously adapted by the surgeon, in particular by cutting it.
- the screw 12 is only partially inserted into its hole 1 1, the surgeon begins to screw it by rotating the tool 3 as a screwdriver.
- the head 12a of the screw 12 is tightly applied against the pin 2 which it blocks in translation and possibly also in rotation with respect to the cap 1.
- the surgeon causes the rupture of the fragile zone 13, located at this moment inside the tapped hole 1 January.
- the screw 12 is then in place and fixes the cap 1 to the pin 2.
- the hole 1 1 passes right through the cap 1, perpendicular to the axis of the cylindrical housing 9.
- the two flats (100 , 101) may be located perpendicular to the tap (Fig. 4a) or parallel to the tap (Fig. 4b).
- Figure 5 is a sectional view of the embodiment of Figure 4a. It can be provided that the cap incorporates an embodiment with a bore.
- the body of the flattened cap is larger and may be perforated by a bore, oriented preferably perpendicularly to the axis of the housing 9 and thus to the pin 2.
- the bore can pass right through the flattened cap 1, and allows the passage of a strapping wire or a bone stay.
- This stay is useful in the embodiments described in FIGS. 6, 7, 10 and 14 of EP-A-0 543 709.
- the use of metallic or textile threads constituting guying is of interest in a certain number of applications: fracture patella, olecranon fracture etc.
- the proximal ends of the pins protected by the caps allow the establishment of a stay.
- the invention therefore also relates to the embodiment of the guying and is expressly referred to the aforementioned EP-A-0 543 709 and the corresponding embodiments.
- the cavity 9 receiving the spindle 2 may have a variable diameter, adapted to that of the spindle, which may also be unthreaded, or partially or fully threaded.
- the flats (100, 101) may extend over all or part of the height of the cap.
- the flats (100, 101) are in extension of shoulders (102, 103). These shoulders can serve as a stop for the grippers, thus further limiting the inadvertent movements of the gripper and thus increasing safety during the extraction of the pins.
- Fig. 8 shows a fractured carpal scaphoid, provided with pins whose ends outside the scaphoid are capped with a cap.
- a device is applicable to the surgical treatment of carpal scaphoid pseudarthoses, with or without bone grafting, with other carpal or tarsal bones, with tarsus in fractures-dislocations involving tarsus and metatarsal, or with any other fracture pathology of tarsus and metatarsal.
- the flattened cap 1 protects the surrounding tissues, opposing any inadvertent movement of the spindle or migration.
- the flat protective cap placed under the skin, can be easily identified manually by palpation, which facilitates the extraction of the pin by the surgeon.
- the constraint of having to use an image intensifier is eliminated, which gives it saves time and avoids the radiation emitted by the image intensifier.
- the implant consisting of the flat protective cap according to the invention allows the surgeon to choose a pin of the desired length. Simply put the spindle in place, cut it to the desired length and attach the flat protective cap. This presents a considerable advantage over prior art predetermined size auto-breakable pins. These pins, protected by a tip, are usually available 0.5cm in 0.5cm. They also expose the disadvantage of a break downstream protective olive, thus losing all the advantages of a protective tip of the spit. In addition, the predetermination of the lengths may require that the pointed end of the pin be passed through the opposite cortex, which is a source of irritation to the surrounding tissue.
- the protective implant with flats can create, within a fracture or arthrodesis focus, a certain degree of compression, by the use of threaded pins at their distal ends, the flattened cap. being placed in the proximal position.
- the protective cap 1 according to the invention is very easy to use and can adapt to totally, partially or non-threaded pins.
- the protective cap 1 according to the invention has the advantage of not rolling on the surgical instrument table thanks to the presence of the flats (100, 101).
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1651400A FR3047891B1 (fr) | 2016-02-19 | 2016-02-19 | Capuchon de protection a meplats d'une broche d'osteosynthese avec organe pour sa fixation |
PCT/EP2017/052783 WO2017140559A1 (fr) | 2016-02-19 | 2017-02-08 | Capuchon de protection a meplats d'une broche d'osteosynthese avec organe pour sa fixation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3416572A1 true EP3416572A1 (fr) | 2018-12-26 |
Family
ID=56322032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17704235.5A Pending EP3416572A1 (fr) | 2016-02-19 | 2017-02-08 | Capuchon de protection a meplats d'une broche d'osteosynthese avec organe pour sa fixation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3416572A1 (fr) |
FR (1) | FR3047891B1 (fr) |
WO (1) | WO2017140559A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2633822B3 (fr) * | 1988-07-07 | 1991-05-17 | Michael S France | Dispositif d'arret de broche ou tige a usage chirurgical |
DE9006716U1 (fr) * | 1990-06-15 | 1991-07-25 | Schewior, Thomas, Dr.Med., 6903 Neckargemuend, De | |
FR2683712B1 (fr) * | 1991-11-18 | 1995-12-29 | Hades | Capuchon de protection d'une broche d'osteosynthese et ensemble comportant ce capuchon ainsi qu'un organe pour sa fixation sur la broche. |
FR2744902B1 (fr) * | 1996-02-15 | 1998-04-17 | Numedic | Element de fixation distale notamment pour la protection externe de l'extremite d'une broche d'osteosynthese |
-
2016
- 2016-02-19 FR FR1651400A patent/FR3047891B1/fr active Active
-
2017
- 2017-02-08 WO PCT/EP2017/052783 patent/WO2017140559A1/fr active Application Filing
- 2017-02-08 EP EP17704235.5A patent/EP3416572A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3047891B1 (fr) | 2021-06-04 |
WO2017140559A1 (fr) | 2017-08-24 |
FR3047891A1 (fr) | 2017-08-25 |
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