Chapter 7 - Veterinary Instrumentation

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www.vetinst.comTRAUMA IMPLANTS & INSTRUMENTS 7VILock 2.7 Plates with Stacked Locking HolesVILock plates accept perfectly the standard 2.7mm twin start lockingscrew. Locking plates with combination holeshave the disadvantage that the combinationhole occupies a lot of space which results inhole spacing being too large. Theconsequence is that it may not be possible toplace the desired number of screws in anybone fragment.In that situations which demand locking screwsand plates rarely need DCP holes the VI locking plate offers only stackedholes which will take both locking and standard cortical screws but will notoffer compression. The hole spacing is the same as that of a standard2.7mm DCP. Plate profile on page 386.LOCKING 2.7 PLATESLPSH2704034 2.7mm Locking Plate 4 Hole 34mm Long £42.50LPSH2705042 2.7mm Locking Plate 5 Hole 42mm Long £44.00LPSH2706050 2.7mm Locking Plate 6 Hole 50mm Long £46.00LPSH2707058 2.7mm Locking Plate 7 Hole 58mm Long £48.00LPSH2708066 2.7mm Locking Plate 8 Hole 66mm Long £50.00LPSH2709074 2.7mm Locking Plate 9 Hole 74mm Long £52.00LPSH2710082 2.7mm Locking Plate 10 Hole 82mm Long £54.00LPSH2711090 2.7mm Locking Plate 11 Hole 90mm Long £56.00LPSH2712098 2.7mm Locking Plate 12 Hole 98mm Long £58.00LPSH2713106 2.7mm Locking Plate 13 Hole 106mm Long £60.00LPSH2714114 2.7mm Locking Plate 14 Hole 114mm Long £62.00LPSH2715122 2.7mm Locking Plate 15 Hole 122mm Long £64.00LPSH2716130 2.7mm Locking Plate 16 Hole 130mm Long £66.00LPSH2717138 2.7mm Locking Plate 17 Hole 138mm Long £68.00LPSH2718146 2.7mm Locking Plate 18 Hole 146mm Long £70.00LS27PSET 2.7mm Locking Plate Set £795.00VILock 2.4 Plates with Stacked Locking HolesVI 2.4 locking plates have stacked locking holes as is thecase with our 2.7 plates. The twin starthole in the plate is the same size as the2.7 locking plate. The following screwsmay be used, locking 2.4 (LS2424**),locking 2.7 screws (LS2724**), cortical2.4, cortical 2.7 and cancellous 3.0.Hole spacing is 7mm, the same as the2.4DCP. Plate profile on page 386.LOCKING 2.4 PLATESLPSH240431 2.4mm Locking Plate 4 Hole 31mm Long £42.50LPSH240538 2.4mm Locking Plate 5 Hole 38mm Long £44.00LPSH240645 2.4mm Locking Plate 6 Hole 45mm Long £46.00LPSH240752 2.4mm Locking Plate 7 Hole 52mm Long £48.00LPSH240859 2.4mm Locking Plate 8 Hole 59mm Long £50.00LPSH240966 2.4mm Locking Plate 9 Hole 66mm Long £52.00LPSH241073 2.4mm Locking Plate 10 Hole 73mm Long £54.00LPSH241180 2.4mm Locking Plate 11 Hole 80mm Long £56.00LPSH241287 2.4mm Locking Plate 12 Hole 87mm Long £58.00LPSH241394 2.4mm Locking Plate 13 Hole 94mm Long £60.00LPSH2414101 2.4mm Locking Plate 14 Hole 101mm Long £62.00LPSH2415108 2.4mm Locking Plate 15 Hole 108mm Long £64.00LPSH2416115 2.4mm Locking Plate 16 Hole 115mm Long £66.00LPSH2417122 2.4mm Locking Plate 17 Hole 122mm Long £68.00LPSH2418129 2.4mm Locking Plate 18 Hole 129mm Long £70.00LS24PSET 2.4mm Locking Plate Set £795.00Locking Pancarpal ArthrodesisAt the 2009 BVOA scientific meeting there was a lengthy discussionregarding the value of incorporating Locking Screws into pancarpalconstructs. Locking Screws add angular security which was generallyregarded to be a good thing. The presence of compression holes was alsoconsidered to be desirable.Aaron Moles (Perth) considers that once the cartilage has been removedthe carpus effectively becomes a comminuted fracture and questionswhether placing a single screw in a small fragment (the radial carpal bone)is appropriate. All good fun! Veterinary Instrumentation has produced asmall number of plates which offer a variety of combinations. Feedbackfrom surgeons is appreciated. All radial carpal bone holes are round.In this Plate all holes are locking and will accept either 3.5 locking (LS35**series) or 2.7 locking with a 3.5 head (LS2735** series).This Plate is as above but includes two DCP holes above and below theradial carpal bone hole. The above two plates have the same dimensionsand hole spacing as 152907XL (see page 200)This Plate is effectively a double hybrid in that it includes both locking andDCP holes of two different sizes. Proximal holes are 3.5, distal are 2.7 (2.7or LS2724** series).LOCKING PANCARPAL ARTHRODESIS152907XLLS Locking Pancarpal Arthrodesis - All 3.5 locking holes £125.00152907XLL Locking Pancarpal Arthrodesis - All 3.5 locking holes except2 DCP holes above and below radial carpal bone hole £125.00152903XLL Locking Pancarpal Arthrodesis - Double hybridProximal, 3.5 Distal 2.7 £125.00www.vetinst.com2.4 DCPsBone Plate ProfilesAll our Bone Plate Profiles areprinted on the pages inside the backcover. They are also in the documentdownload section ofwww.vetinst.com A full set of profilesprinted on clear acetates as an aid tofracture planning is available free ofcharge.Remember the profiles are actualsize so you will have to compensate(5-10%) for magnification dependingon the position of the bone and thehead of the x-ray unit.Designed by Vets for Vets187
7 TRAUMA IMPLANTS & INSTRUMENTSLocking ScrewsThe angular security of locking plate systems depends on a rigid interfacebetween screw and plate. This is achieved by the use of interlockingthreads.Threaded systems are the most common. The modulus of bone andstainless steel differs greatly and the ideal screw thread for one will not suitthe other. Stainless steel demands fine threads whereas bone needs arelatively coarse thread. If we use a fine thread in the plate and a coarsethread in the bone, when the head of screw engages the plate, the screwmoving faster through the bone than the plate would have the effect ofpulling the plate towards the bone. This is exactly what we do not want.Some systems compromise by using the same thread in both screw headand bone plate.At Veterinary Instrumentation and in the industry Standard Locking Screwthe problem is solved by some ingenious engineering. The threads on thehead of our screws are fine as required but have a twin start. The threadstaper down the head as a double helix. The pitch (the distance betweenthe tips of the threads) of each individual fine thread is the same as thethreads on the bone screw but because of the double helix the number ofthreads per millimeter of locking thread is double that of the bone screwgiving the fine threads required for metal on metal. The screw movesthrough the bone at the same rate as it moves through the platemaintaining the relative positions of both bone fragment and plate.There is an additional benefit of the double helix. As the screw headapproaches the plate a single start thread may have to wait 360 degreerotation before the threads start to engage. In the 3.5 screw this mightmean that the plate is pushed around one millimeter before the head of thescrew engages. With a twin start thread the screw head will engage within180 degrees of contact.Locking Screw SetsAvailable with either Hex (3.5mm only) or Star Drive Head. Setsdiscounted by over 5% from component price.3.5 Set includes 3 x 12-20mm, 4 x 22-26mm, 5x 28-40mm, 4x 42-50mm,3x 52-58mm Locking Screws and 5 Locking Plugs.2.7 Set includes 3 x 6-8mm, 4 x 10-16mm, 5x 18-28mm, 4x 30-32mm,3x 34-40mm Locking Screws and 5 Locking Plugs.2.4 Set includes 3 x 6-8mm, 4 x 10-16mm, 5x 18-28mm, 4x 30-32mm,3x 34-40mm Locking Screws and 5 Locking Plugs.LOCKING SCREW SETSLS35KIT 3.5 Hex Drive Locking Screw Set £1,495.00LS35STARKIT 3.5 Star Drive Locking Screw Set £1,495.00LS27STARKIT 2.7 Star Drive Locking Screw Set £995.00LS24STARKIT 2.4 Star Drive Locking Screw Set £995.00LS20STARKIT 2.0 Star Drive Locking Screw Set £995.00Locking Screws - Hex DriveLocking Screw Hex Drive 3.5mmVI Screws are an exact fit for Standard Locking Plates but utilise theconventional Hex Drive rather than a Star Drive. See overleaf for StarDrive.LOCKING SCREW 3.5mm USE 2.7mm PILOT PLUS DRILL SLEEVELS3510 Locking 3.5 Screw Hex Drive 10mm £12.50LS3512 Locking 3.5 Screw Hex Drive 12mm £12.50LS3514 Locking 3.5 Screw Hex Drive 14mm £13.25LS3516 Locking 3.5 Screw Hex Drive 16mm £13.25LS3518 Locking 3.5 Screw Hex Drive 18mm £13.75LS3520 Locking 3.5 Screw Hex Drive 20mm £13.75LS3522 Locking 3.5 Screw Hex Drive 22mm £14.50LS3524 Locking 3.5 Screw Hex Drive 24mm £14.75LS3526 Locking 3.5 Screw Hex Drive 26mm £15.00LS3528 Locking 3.5 Screw Hex Drive 28mm £15.25LS3530 Locking 3.5 Screw Hex Drive 30mm £15.75LS3532 Locking 3.5 Screw Hex Drive 32mm £16.00LS3534 Locking 3.5 Screw Hex Drive 34mm £16.25LS3536 Locking 3.5 Screw Hex Drive 36mm £16.50LS3538 Locking 3.5 Screw Hex Drive 38mm £16.75LS3540 Locking 3.5 Screw Hex Drive 40mm £17.00LS3542 Locking 3.5 Screw Hex Drive 42mm £17.25LS3544 Locking 3.5 Screw Hex Drive 44mm £17.50LS3545 Locking 3.5 Screw Hex Drive 45mm £17.50LS3546 Locking 3.5 Screw Hex Drive 46mm £17.75LS3548 Locking 3.5 Screw Hex Drive 48mm £18.00LS3550 Locking 3.5 Screw Hex Drive 50mm £18.50LS3552 Locking 3.5 Screw Hex Drive 52mm £19.00LS3554 Locking 3.5 Screw Hex Drive 54mm £19.50LS3555 Locking 3.5 Screw Hex Drive 55mm £19.75LS3556 Locking 3.5 Screw Hex Drive 56mm £20.00LS3558 Locking 3.5 Screw Hex Drive 58mm £21.00LS3560 Locking 3.5 Screw Hex Drive 60mm £22.00LSDG35 3.5 Locking Screw Drill Guide £52.50H090104 2.7mm Pilot Drill £20.50SHLS35 3.5 Locking Screwbox £135.00Locking PlugLOCKING PLUG HEX DRIVE 2.7/3.5mmIMPROVEDDESIGNUse to protect lockingholes during contouring.LSP35 Locking Plug for LS35** and LS2735** Screws £7.50188
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Chapter 7 - Veterinary Instrumentation

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