ratfix sgt
DESCRIPTION
The RatFix system is a locked internal fixator made of PEEK. For this model a rigid design is available and is offered in different sizes to be used for the femur, humerus and the tibia. Similar RatFix plates are also available with a 50nm Titanium surface finish. The RatFix Screw is made out of TAN and comes in different length and diameters to accomodate different body weights. The screw driver for insertion of the screw is an integral component of the screw design and shears of when sufficient torque is achieved or can by bend of. A four flanche head remains on the screwhead to remove the screw after use. For the application of the plates various Drilland Saw guides are available.TRANSCRIPT
i. Implantsii. Systems1. Surgical material2. Surgical approach3. Application4. Osteotomy 5. Finishing
RatFixSurgical technique guide
Internal fixaton SystemStabilisation of osteotomies with a conventional bridging osteosynthesis. Possible size of osteotomy 0.25 mm to 6.00 mm.
i. ImplantsTechnology The RatFix system is a locked internal fixator made of PEEK. For this model a rigid design is available and is offered in different sizes to be used for the femur, humerus and the tibia.Similar RatFix plates are also available with a 50nm Titanium surface finish. The RatFix Screw is made out of TAN and comes in different length and diameters to acco-modate different body weights. The screw driver for insertion of the screw is an integral component of the screw design and shears of when sufficient torque is achieved or can by bend of. A four flanche head remains on the screw-head to remove the screw after use. For the application of the plates various Drill- and Saw guides are available.
i
RIS.402.120 RatFix ShoulderScrew 0.7x5.7 mm
RIS.602.111 RatFix Plate, 6 hole@16 mm, Humerus
RIS.602.100 RatFix Plate, 8 hole@23 mm, Femur
RIS.602.110 RatFix Plate, 6 hole@18 mm, Tibia
RIS.402.121 RatFix ShoulderScrew 0.7x6.5 mmRIS.402.125 RatFix ShoulderScrew 0.8x6.5 mm
RIS.602.105 RatFix Plate, 8 hole@23 mm 0.8mm, Femur
RatFix
The RatFix system can cover single cut osteotomies up to large bone defects. The plates available can be used within the diaphysis of the femur, humerus and tibia.
ii. Systems
RatFix Plate, 8 hole@23 mm, Femur
RatFix
Implants:- 1x 8 hole RatFix plate - 6x RatFix ShoulderScrews
1. Surgical material
Implant specific instruments:- 1x RatFix Drill-& Saw guide
Instruments:- min. 2x HandDrills - 1x Accu Pen 6V+
Consumables:- 1x 0.68 mm Drill bit- 1x 0.44 mm Gigly wire saw, L=0.50 m- 1x Square box wrench 0.70 mm - 1x Vicryl suture 3-0 - 1x Polyamid suture 3-0
RIS.390.211 Accu Pen 6V+
RIS.590.110 Gigly wire saw 0.44 mm
RIS.592.202 Drill Bit 0.68 mm
RIS.590.112 Square box wrench 0.70 mm
RIS.302.106 RatFix Drill- & Saw guide 6 mm@23 mm
RIS.402.121 RatFix ShoulderScrew 0.7x6.5 mmRIS.602.100 RatFix Plate, 8 hole@23 mm, Femur
RIS.390.130 HandDrill
RatFix
Positioning
Rat in prone position.
2. Surgical approach
RatFix
Approach
Longitudinal skin incision along the femur from the hip joint to the knee.
2. Surgical approach
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Small medial incision of the fascia lata and blunt preparation of the muscle below.
M. vastus lateralis and M. biceps femoris are split and M. tensor fasciae latae is lifted to expose the full length of the femur preserving the sciatic nerve.
Circular preparation of the femur at the area of the planed osteotomy.
2. Surgical approach
RatFix
Application of the Gigly wire saw
Put the wire saw closely around the bone in medio-lateral orientation.
Preparation of the hardware
Insert the screws into the holders of the hand drill no more than 1-2 mm deep.
3. Application
RatFix
Plate positioning on the femur
Place the plate on the prepared femur in anterolateral direction by externally rotating the femur.
Fix the plate to the bone with forceps in the middle of the diaphysis. Do not hold the plate on the distal or proximal end. Always hold it in the middle as shown in the illustration on the right side.
3. Application
RatFix
Preparation for drilling and screwing
By applying the first screw the alignment of the plate is determined. Therefore it is important to keep the position of the plate parallel to the femur.
Adjust the orientation of the longitudinal axis so that the plate is reclined anterolater-ally and parallel to the bone.
Retain rotation of the bone to ensure the stability of the plate.
3. Application
RatFix
3. ApplicationDrilling and insertion of the screws
Carefully use the forceps to hold the plate in position to the femur.
Drill the first hole (1) distally to the planned fracture gap and insert the screw.
Shear off the drive shaft.
RatFix
3. ApplicationSequence of screw placement
Make sure that the longitudinal allignement of the plate to the bone is correct.
Drill the hole for the second screw (2) proximally to the planned osteotomy and insert the screw.
The remaining screws should be placed in the order as shown in the illustration.
Make sure to insert the last screws (5,6) without shearing off the pins to provide additional stability during sawing.
5 1 2 64 3
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4. OsteotomyAccomplishing the osteotomy
Apply the Drill- & Saw guide to the plate by sliding it over the remaining screw shafts.
Create a defined fracture gap by using the Gigly saw (sufficient irrigation !).
Start sawing by keeping your hands close to-gether. With progressing saw depth increase hand distance to avoid high forces and to prevent cutting into the RatFix plate.
Finish under visual control after removing the sawguide. Cutting into the RatFix plate alters the fixation stability.
RatFix
5. FinishingWound closure
Lift the M. quadriceps loosely over the plate.
Close the fascia lata with Vicryl suture 3-0.
Skin suture with Polyamid suture 3-0.
To avoid wound biting it is also possible to use skin glue instead of a suture.
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Hazards and legal restrictionsScientific editor: Katharina Schmidt-Bleek, Germany Agnes Ellinghaus, GermanyIllustrations: Sandra Wissing, SwitzerlandDesign and layout: Romano Matthys, Switzerland In collaboration with: Julius Wolff Institut and Center for Musculoskeletal Surgery Charité-Universitätsmedizin Berlin, Germany Hazards Great care has been taken to maintain the accuracy of the information contained in this publication. However, the publisher, and/or the distributor, and/or the editors, and/or the authors cannot be held responsible for errors or any consequences arising from the use of the information contained in this publication. Contributions published under the name of individual authors are state-ments and opinions solely of said authors and not of the publisher, and/or the distribu-tor, and/or the RISystem Group. The products, procedures, and therapies described in this work are hazardous and are therefore only to be applied by certified and traine medical professionals in environments specially designed for such procedures.
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RatFix