ratexfix sgt
DESCRIPTION
The RatExFix system is a locked external fixator made of PEEK and TAN which offeres a simple and adjustable design and comes in a variety of sizes and stiffnesses. We currently offer a standard model for osteotomies from 0.25 to 6.00 mm. The RatExFix Mounting pin is made of TAN and comes in one standard length with a four flange drive enabling application and removal of the pin. For the different gap sizes, specific Saw Guides are available.TRANSCRIPT
i. Implantsii. Systems1. Surgical material2. Surgical approach3. Application4. Osteotomy 5. Finishing
RatExFixSurgical technique guide
External fixation SystemStabilization of the femur with an external fixator enabling osteoto-mies from 0.25 to 6.00 mm with stiffnesses from 10-100 %. In-vivo adjustment of fixator stiff-ness is possible.
Technology The RatExFix system is a locked external fixator made of PEEK and TAN which offeres a simple and adjustable design and comes in a variety of sizes and stiffnesses.We currently offer a standard model for osteotomies from 0.25 to 6.00 mm.The RatExFix Mounting pin is made of TAN and comes in one standard length with a four flange drive enabling application and removal of the pin.For the different gap sizes, specific Saw Guides are available.
ii. Implants
assembled RatExFix with adjustable stiffness
RatExFix Mounting pin 0.45 mm
simple RatExFix with adjusted stiffness
simple RatExFix with standard stiffness
RatExFix
The RatExFix system can cover single cut osteotomies up to large bone defects or flexible fixation technology. The fixators available can be used within the diaphysis of the femur. The images on the right demonstrate some models of RatExFix applied to a rat femur.
ii. Systems
simple RatExFix assembled with Femur (5 mm osteotomy)
RatExFix
Implants:- 1x RatExFix simple 100% - 4x RatExFix Mounting pins 0.85 mm
1. Surgical material
Implant specific instruments:- 1x RatExFix Saw guide
Instruments:- 2x hand drills - 1x Accu Pen 6V+
Consumables:- 1x 0.79 mm Drill bit - 1x 1.00 mm Centering Bit- 1x 0.44 mm Gigly wire saw, 0.50 m - 1x Square box wrench 0.70 mm- 1x Vicryl suture 3-0 - Polyamid suture 3-0
RIS.612.120 RatExFix simple 100% RIS.412.100 RatExFix Mounting pin 0.85 mm
RIS.590.110 Gigly wire saw 0.44 mm
RIS.593.203 Drill Bit 0.79 mm
RIS.590.112 Square box wrench 0.70 mm
RIS.312.110 RatExFix Sawguide 5.00 mm & single cut
RIS.390.130 HandDrillRIS.390.211 AccuPen 6V+
RIS.592.205 Centering Bit 1.00 mm
RatExFix
PositioningRat in prone position.
2. Surgical approach
RatExFix
ApproachLongitudinal skin incision along the femur from the hip joint to the knee.
2. Surgical approach
RatExFix
2. Surgical approach 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 preserv-ing the sciatic nerve.
Circular preparation of the femur at the area of the planed osteotomy.
RatExFix
Circular preparation of the femur at the area of the planned osteotomy.
2. Surgical approach
RatExFix
Application of the Gigli wire sawPut the Gigli wire saw closely around the bone in medio-lateral orientation.
3. Application
RatExFix
Centering of the first screw hole Position the 1.00 mm centering bit in the RatExFix as shown. Make sure the RatExFix is not mounted upside down by inserting the centering bit into the RatExFix. If there is no resistance within the first few tenths of a millimeter the orientation of the fixator is correct. Keep the right orientation of the RatExFix in mind during the whole application procedure.
Position the device on the prepared femur in anterolateral direction by externally rotating the femur.
After correct positioning carefully create the countersink.
3. Application
Detail:Sectional view of the orientation of the RatExFix to the centring bit showing top/bottom.
topRatExFix
Preparation for drilling and screwingBy applying the first Mounting pin the align-ment of the fixator is determined. Therefore it is important to pay attention to positioning the fixator bar parallel to the femur.
Adjust the orientation of the longitudinal axis so that the fixator bar is aligned antero-laterally and parallel to the bone.
Retain rotation of the bone until you have inserted the first Mounting pin.
3. Application
RatExFix
3. ApplicationDrilling and insertion of the Mounting pin Insert the drill bit into the distal hole (1) of the fixator bar and check the position of the drill bit (tip pointing into the countersink). While drilling make sure that you drill completely through both cortices.
Place the MountingPin into the distal hole (1) of the fixator bar (remember the upside down orientation of the bar). Turn the MountingPin into the bar until the upper thread is flush with the top surface of the bar.
While screwing the MountingPin with the fixator bar into the bone make sure to exactly follow the predrilled hole. Stop turning when the end of the lower thread is close to the top surface of the bone.
1
RatExFix
3. ApplicationSequence of screw placementDrill the hole for the second screw (2) proximal to the planned osteotomy and insert the screw.
The third (3) and the last screw (4) should be placed in the order shown in the illustration.
1 4 23
RatExFix
4. OsteotomyAccomplishing the osteotomy
Apply the Saw guide to the fixator bar.
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.
RatExFix
5. FinishingWound closure
The fascia lata is closed with vicryl suture 3-0.
Skin suture with Polyamid suture 3-0.
RatExFix
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, GermanyHazards 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 trained medical professionals in environments specially designed for such procedures.
RISystem AGTalstrasse 2A7270 [email protected]
No suggested test or procedure should be carried out unless, in the user‘s professional judgment, its risk is justified. Whoever applies products, procedures, and therapies shown or described in this work will do this at their own risk. Because of rapid advances in the medical sciences, RISystem recommends that independent verification of diagnosis, therapies, drugs, dosages, and operation methods should be made before any action is taken. Although all advertising material which may be inserted into the work is expected to conform to ethical (medical) standards, inclusion in this publication does not constitute a guarantee or endorsement by the publisher regarding quality or value of such product or of the claims made of it by its manufacturer.
RatExFix