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CHABLOZ
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Lower Limbs


Type C Knees:

Control of the swing phase and control of the stance phase (possibility of descending slopes and stairs). These knees have additional functions, but they often require a supervised apprenticeship by rehabilitation professionals.

 

Sensor (Ortho Europe)

Single axis knee with an alloy frame and a hydraulic cylinder for controlling the swing phase and the control of the stance phase . It allows the descent of slopes and stairs through progressive braking based on loading, and offers the possibility of being completely locked.

It is a very reliable knee which secures patients of various weights thanks to the many settings available.

It is suitable for moderately active or active patients who require high safety.

 

3R80 (Otto Bock)

Single axis knee with extension return, and hydraulic control of the swing phase. The hydraulic control of the stance phase is based on the load applied. The sensitivity of the trigger level and the hardness of the braking phase are separately controllable for dynamism and safety. Dynamic patients appreciate its flexibility and efficiency. There is a lighter version.

 

The SNS system

This system is a hydraulic shock absorber which comes on a different chassis with a single axis joint and two levels of resistance:

Endolite

A one-piece carbon chassis. It is light. A high-activity version is available with a reinforced  carbon chassis.

 

MAUCH XG (Ossur)

Carbon chassis with articulation and axis shock absorber with needle bearings. Available with a less resistant shcok absorber.

The SNS system allows for fine tuning and effective regulation of the swing phase. A separate control allows it to obtain a resistance during the stance phase to descend slopes and stairs. The principle of action of the control of the stance phase is not based on the load applied, it is a prioritised, and deactivates when the knee is hyperextended in the late stance phase. It automatically resets itself when the knee comes back to extension in the late swing phase.
Moreover, a simple manipulation allows a complete locking (for stiff walking), and another manipulation disables the hydraulic knee to make it free (for cycling).
This system is suitable for active, dynamic,or very dynamic patients and for sportspeople (leisure).
Learning how to use it often requires appropriate rehabilitation.

 

The C-Leg knee (Otto Bock)

This knee is the ultimate in high-tech, and the complexity of it’s system has been designed for ease of use.
It is a single axis knee with prepreg carbon chassis. Its hydraulic cylinder unit is controlled by a microprocessor for swing phase and stance phase. All settings are made using a PC and a specific program.

Sensors located at the axis of the knee in the swing phase regulate the knee through a calculation of the angle and speed of flexion / extension with a microprocessor every microsecond.

The adjustments do not involve applying resistance, but in limiting the angular range of movement to make it very supple and reduce the energy expenditure of the patient.

In stance phase, a load sensor located at the ankle informs the microprocessor of the position and intensity of the load. The knee cannot escape unexpectedly.
Safety in stance phase is in enabling progressive braking down hills and stairs. In the stance phase safety cannot be disabled.

This knee enables walking on uneven terrain safely.
A "mode 2" function is set to the knee for a given activity (skiing, biking, climbing, carrying objects, etc.).

This knee is suitable for a wide variety of patients using the controlled stance phase.
Adjustments should be made with great care, and should refine the rhythm of the patient's progress.

A version exists for long stumps.

For the sake of safety and monitoring, the knee should be reviewed annually on the anniversary of the date of delivery of the prosthesis.

The new battery has a capacity of 30-35 hours, and 20 hours after 2 years of use. Full charge time is 3.5 hours.
When there is no battery, the knee is locked for safety.

Since February 3rd, 2005, it has been taken in charge by Social Security in France for patients entering into a protocol for validating specific criteria tests. They must be an active patient who already have a first knee prosthesis equipped with a monoaxial with a walking speed greater than or equal to 3 km /h and a continuous walking perimeter of over 500 m.
Only after a trial period of 15 days can the prosthesis be prescribed by a Doctor of physical medicine and rehabilitation if the patient meets the following conditions:

  • walking distance continuously over 2 km
  • walking speed greater than or equal to 4 km/h
  • down an incline of at least 15%
  • down some stairs taking alternate steps.

A Doctor's certificate certifying the validity of the tests must be attached to the prescription at time of the study of the demand. A video of these tests may be requested by the Social Security funding body.

The annual services are also taken in charge by social security.

 

The Hybrid Knee (Protéor ®)

Monoaxial knee comprising a carbon chassis, a cylinder controlling a pneumatic system and a hydraulic system supporting up to 100 kg.
The hydraulic system controls the stance phase on slopes. An MRS system (Detection of   Reaction Mechanism) disables the hydraulic when the load passes over the forefoot.
The pneumatic system controls the swing phase. It is assisted by a microprocessor, allowing for a change of pace.
The maximum flexion is 140 °.
It works with a battery that has a lifespan of 2 years.

 

The Rheo Knee (Ossur ®)

Single axis knee with a light-alloy chassis uses the power of artificial intelligence to control the swing phase and stance phase by microprocessor.
This is a new technology using magnetic fields, a magnetorheological fluid and rotating blades to vary the resistance in real time of the knee. Two force sensors transmit the fluid, with a  microprocessor, to give resistance to the knee. The resistance generated by the magnetic fluid is proportional to the weight submitted on the knee, so there is no resistance in swing phase.

This knee uses software (Dynamic Learning Matrix Algorithm: DLMA) based on artificial intelligence that studies the styles of each step and provides a mechanism that will continuously monitor and optimize the swing phase.
Adjustments are made through software running on an HP iPAQ. The SETUP mode allows an initial automatic programming  through the calculation of baseline values for the swing and stance phases. A manual adjustment is needed to refine the settings.

From the first step, the Rheo knee compares the maximum degree of flexion achieved at each swing phase to select the values determined by the Prosthetist with the Rheo software. The optimization of the settings continues even after the completion of the initial program by the Prosthetist.
It adapts to the walking pace and the style of each walk.

It comes in two versions: one for short stumps, the other for long stumps.
Maximum flexion is 120 °.

The indications for the knee are:

  • A person with a normal leisure and work actvity with the ability to move at different speeds down a slope and stairs.
  • patient weight between 50 and 90 Kg

The battery provides a battery life of 48 hours and is charged in 2-4 hours. A stop button allows the knee to save battery power.
When the battery is discharged, the knee is free.

The knee is guaranteed for 36 months. Two services are necessary for the guarantee: one at 15 months and one at 30 months.


Many others knees exist or are under study, and we keep informed of every development to benefit our patients. We often have the opportunity to test equipment by working closely with our suppliers. We will not fail to update our information about the latest developments.