Wonderful FBK-86G

The FBK-86G belongs in limbs for active transfemoral and knee-disarticulation users who vary their walking speed and want a deep bend. Its sheet describes a mechanism in three layers, and each layer has a clinical effect and a duty attached.

The first layer is the structure. Carbon fibre, titanium and 7075 aluminium are the premium materials named, and a composite body offers bending and torsional rigidity at low mass. Rigidity matters here because a multi-link joint depends on its pivots staying where they were designed to be. Inspection is the duty that comes with it. Laboratory work on carbon laminates (James and Giurgiutiu, 2020) recorded a one-inch damage zone under a surface dent of about 54 µm, with delamination found only by X-ray imaging. That finding comes from test coupons and draws no conclusion about any knee, but it explains the rule: check the body after every fall or impact, and withdraw it if a crack, a soft spot or a new noise appears.

The second layer is the linkage, which sets stance stability by geometry. Alignment places body weight so that it holds the straight knee in extension, and the parallel bars prove it. Third comes the hydraulic cylinder, which paces the swing across cadences once its resistance is adjusted to the user.

Workshops add one more discipline. Covers and fittings are attached only at the points the instructions for use allow, with no extra holes and no clamps on the composite walls.

Typical settings are limb-fitting centres, private clinics, rehabilitation units and export fitting programmes. NHS procurement routes use the mandated NHS Supply Chain framework, and equivalent public procurement elsewhere asks the same. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

Rigidity where a linkage needs it

A structure that resists bending and twist keeps the pivots in their designed positions under load. The stance geometry set at alignment is then the geometry the user walks on.

Three materials, each with a job

Titanium, 7075 aluminium and carbon fibre appear together on the sheet. The parts list shows where each is used, which tells the workshop what to torque, what to inspect and what never to drill.

1000 g for a hydraulic unit with links

The hip lifts the knee on every stride, so mass at this level of the limb is felt all day. The sheet prints 1000 g for the joint, and the quotation's parts list says which fittings that figure includes.

A bend of 145°

Deep flexion gives room for kneeling, low seating and pedalling, within what the socket permits. The figure is for the bare joint, and the finished limb is measured at fitting.

Stance stability from geometry

Linked pivots place the turning point of the joint so that weight on a straight leg holds it straight. Alignment sets how much of that stability the user gets and how easily the knee releases at toe-off.

Swing that follows the walker

Hydraulic resistance rises with the speed of the shin. A user who moves between a slow indoor pace and a brisk outdoor one keeps a controlled heel rise at both, once the cylinder is adjusted.

No electrical upkeep

The joint has no battery, charger or firmware, and needs no electrical safety test. Its upkeep is mechanical: inspection, torque checks and whatever service the cylinder requires.

Damage rules that can be taught in minutes

A short, visual routine covers the composite: clean, light, look, tap, listen. Users and carers can learn it at fitting and repeat it at home after any fall.

Hydraulic geometric multi-link design

The sheet's English name and its Chinese name, 液压几何多连杆膝关节, agree on all three terms. The manufacturer's drawing shows how many links the joint has and where the cylinder sits among them.

Carbon fibre in the material line

This is the feature that sets the care routine. Resin-bonded fibre gives stiffness at low mass, and it needs inspection after impact because layers can separate out of sight.

Titanium at the load points, if the parts list says so

Titanium appears first in the material line. Whether it forms the pivots, the connection fittings or both is a question for the parts list in the quotation.

7075 aluminium alloy

7075 is a high-strength aluminium alloy widely used for structural parts. The components made from it, and their surface treatment, are itemised by the manufacturer.

145° knee flexion range

A printed range of 145° describes the joint alone. Socket shape, shin components and a cosmetic cover decide the range of the finished limb.

1000 g mass

Mass is printed in brackets beside the code. Check against the parts list whether the top fitting and the lower connection are counted in it.

150 kg load weight

The sheet gives one load figure. The ISO 10328 test report, issued by the manufacturer and shared by the enquiry team, adds the loading level and the number of cycles.

Ribbed, woven-look upper shell

In the photograph the upper body is dark, with curved ribs and a woven-look surface down its front. Whether that surface is structural carbon or a cover is stated in the written configuration.

Silver fasteners along the rear edge

Three silver fasteners sit in a line down the back of the upper body in the photograph, with a brass-coloured one lower on the side. Their sizes, torque values and thread-locking method are listed in the instructions for use.

Brass-coloured top fitting

A small brass-coloured fitting stands above the shell in the photograph. The drawing identifies it and gives the proximal connection that mates with the socket adapter.

Smooth black lower section

Below the shell, the photograph shows a round black section that narrows at a waist. The instructions for use say what it houses and whether any adjustment is reached there.

Collar, side screw and gold-coloured ring

Near the bottom of the unit the photograph shows a collar with a silver side screw and a thin gold-coloured ring beneath it. The drawing explains what the collar clamps and what the ring does.

Stepped lower end

The unit finishes in a narrower black end that looks stepped or threaded in the photograph. The distal connection, its diameter and the parts that fit it are defined on the drawing.

Mechanical operation throughout

Nothing on the sheet is powered. The knee works by linkage geometry and fluid resistance, so its behaviour does not depend on charge level or software.

FBK prefix and G suffix

The code opens with letters and closes on a "G", and the sheet explains neither. The manufacturer's written configuration, shared by the enquiry team, says whether the "G" marks a version, a finish or a material option.

Manufacturer quality statements

At company level, an ISO 13485 quality system and CE certification are described on the maker's own website. For the FBK-86G itself, the declaration and certificate scope are issued by the manufacturer and shared by the enquiry team.

Choose the FBK-86G for an active user who changes pace, wants a deep bend and attends a service that inspects composite parts routinely. Pass on it where knocks to the knee are frequent and inspection cannot be relied on, or where the user needs a function the instructions for use do not evidence. Three documents decide the purchase. A parts list allocates the titanium, aluminium and carbon fibre. The instructions for use set the inspection criteria, the permitted fastening points and the cylinder adjustments. Behind the 150 kg figure sits the ISO 10328 report, and every adapter in the limb should match that rating.

Medigear.uk lists the FBK-86G for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the parts list, instructions for use, ISO 10328 test report, drawing, written configuration for the code and warranty terms before ordering.