Predictika · Lower-limb prosthesis orders

An AI sales agent's prosthetic limb order, checked before it goes out

An AI sales agent prepares an order for a lower-limb prosthesis: a knee, a foot, the user's weight and activity level, the spring set, the foot size and width and the charger kit. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the catalogue's selection rules and returns a verdict, every reason and the figures it computed.

Scope: Orders built from the Linx, Orion3 and SmartIP knees and the Elan, ElanIC and Linx feet: user weight, activity level, spring set, foot size and width, chargers. See everything this validator covers

This validator models orders for these lower-limb prosthesis components, not just the scenarios shown below.

  • Components — the Linx integrated limb system, the Orion3 and SmartIP knees, and the Elan and ElanIC ankle/feet, for above-knee and below-knee users. The Linx is quoted as one integrated limb system.
  • Weight and activity level — the weight and activity limit of the complete prosthesis is set by its lowest-rated component (125 kg; 100 kg at activity level 4). Activity level 1 is outside the rated range of the Linx, Orion3, Elan and ElanIC. Activity levels 2 and 4 are bracketed ratings and need a clinician's sign-off.
  • Spring set, size and charger — the spring set is compared with the catalogue's weight-band guide (one level lower for an above-knee user of the Elan or ElanIC, one level higher at activity level 4); foot sizes run 22 to 30 cm, with a choice of narrow or wide offered for sizes 25 to 28 only; the Elan and ElanIC use different charger kits. The maximum weight the quote states is compared with the computed limit.

Any order built from these components that touches these rules is in scope — not only the scenarios pictured here. Not covered: prices (the catalogue lists none, so this validator produces no price build-up or line-item quote), other Blatchford knees, feet, adapters, liners and sockets, junior products, and regional reimbursement rules.

The AI sales agentBuilds the prosthesis order from the conversation and says it is ready.
Predictika validatorChecks every rule at once and returns the verdict, each finding, and the computed figures.

7 scenarios in 3 groups · each group runs from the agent’s first attempt to the outcome · click one to switch

What the agent proposes

The AI sales agent says

Illustrative agent statement. The validator receives the structured request below.

Proposing agent: AI sales agent (scripted)

Before sending, the agent must call Recorded run

Predictika validator


      

        
        
        
      

      
Waiting for the call.

      
    

  

  
  

    
Where rules-based CPQ gets it wrong
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Our assessment of what a typical rules-based CPQ (product rules, price rules and validation rules, as in Salesforce CPQ) does with the same cases. It is a judgment about effort and reliability, not a claim that nothing can be built.

    
What the validator caughtTypical rules-based CPQPredictika
A weight and activity limit set by the weakest componentOnly with care
The limit of the complete prosthesis is the lowest rating among the knee and foot, and it changes with the activity level; a rule per component and a minimum across them has to be written and kept up to date.		Every component is in one request and the limit is computed on each call, then compared with the user and with the figure the quote states.
A spring set that depends on weight band, amputation level, foot and activity levelOnly with workarounds
A weight-band lookup with two adjustments that depend on other choices; it ends up as a table plus several cross-field rules that interact.		The recommended set is computed from the weight band and both adjustments, and compared with the set on the quote.
Width choices that exist only for some foot sizesOnly with care
A dependency of one field on another; each size band needs its own rule, and a new size or width means editing them.		Size and width are checked together on every call, whichever order they were chosen in.
A charger kit that must match the footOnly with care
A compatibility rule between two selections; workable, but every new foot or kit adds another pairing to maintain.		The foot and charger kit are in one request and every pairing is checked together.
Every problem returned in one answerOnly with workarounds
Rules tend to fire as the order is saved or a step is completed, so a rep often fixes one error and meets the next.		All findings come back together, whatever order the choices arrived in.

  

  

    
What this validator catches: findings from its test cases
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Every rule is checked on every call, in any order the choices arrive; one problem never hides another. Blocking findings stop the quote; approval findings need a person to sign off; everything else is computed.

    
1The Linx is a fully integrated limb system; the Linx knee and its Linx foot are quoted together and cannot be combined with a different foot or knee.
2The quote has a knee component (Linx, Orion3 or SmartIP) for a below-knee user; these knees are for above-knee users.
3The user weighs 130 kg, but the lowest-rated component on the quote limits the complete prosthesis to 125 kg at this activity level.
4The user weighs 43 kg, below the 44 kg start of the foot spring selection guide.
5Activity level 1 is outside the rated range of the Linx, Orion3, Elan and ElanIC; the complete prosthesis is rated by its lowest-rated component.
6Activity level 1 is a bracketed rating for the SmartIP; a clinician must confirm it.
7Activity level 2 is a bracketed rating for these components, and the spring set is chosen by the clinician for the individual user rather than from the spring guide; a clinician must confirm it.
8Activity level 4 is a bracketed rating, limited to users up to 100 kg and dependent on local reimbursement guidelines; a clinician must confirm it.
9The user weighs 105 kg, but the lowest-rated component on the quote limits the complete prosthesis to 100 kg at this activity level.
10The quote states a maximum user weight of 125 kg for the complete prosthesis, but its lowest-rated component allows 100 kg.
11Spring set 5 is on the quote, but the spring selection guide gives set 4 for a user of 85 kg at activity level 3 (set one level lower for an above-knee user of the Elan or ElanIC, one level higher at activity level 4).
12Spring set 4 is on the quote, but the spring selection guide gives set 5 for a user of 85 kg at activity level 3 (set one level lower for an above-knee user of the Elan or ElanIC, one level higher at activity level 4).
13Spring set 3 is on the quote, but the spring selection guide gives set 4 for a user of 70 kg at activity level 3 (set one level lower for an above-knee user of the Elan or ElanIC, one level higher at activity level 4).
14Size 23 cm feet come in the narrow width only; narrow and wide are offered for sizes 25 to 28 only.
15Size 29 cm feet come in the wide width only; narrow and wide are offered for sizes 25 to 28 only.
16Foot size 31 cm is outside the 22 to 30 cm range.
17The charger kit on the quote is for a different foot; the Elan uses charger kit 409087E and the ElanIC uses the inductive IC charger kit 409087IC.
18The quote states a maximum user weight of 110 kg for the complete prosthesis, but its lowest-rated component allows 125 kg.
19The quote has neither a knee nor a foot.
20After the above-knee and activity level adjustments the spring guide falls outside spring sets 1 to 8 (it gives set 0); a clinician must choose the spring set.
21The quote states a maximum user weight of 90 kg for the complete prosthesis, but its lowest-rated component allows 125 kg.

  

  

    
Scenarios and results
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The recorded result of the validator for each scenario on this page: the request the AI agent sent, the verdict, and every finding, in the order they appear above.

    
1. Orion3 knee and Elan foot: An order for an Orion3 knee and an Elan foot for an above-knee user

    
The agent's request. Please quote a prosthesis for an above-knee user weighing 84 kg at activity level 3: an Orion3 knee with an Elan foot, size 23 cm, wide width, spring set 5, with the ElanIC inductive charger kit (409087IC). The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Spring set differs from the guide. Spring set 5 is on the quote, but the spring selection guide gives set 4 for a user of 84 kg at activity level 3 (set one level lower for an above-knee user of the Elan or ElanIC, one level higher at activity level 4).
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  • Wide foot in a narrow-only size. Size 23 cm feet come in the narrow width only; narrow and wide are offered for sizes 25 to 28 only.
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  • Charger kit for a different foot. The charger kit on the quote is for a different foot; the Elan uses charger kit 409087E and the ElanIC uses the inductive IC charger kit 409087IC.
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2. Orion3 knee and Elan foot: The agent resubmits after fixing the errors

    
The agent's request. Please quote a prosthesis for an above-knee user weighing 84 kg at activity level 3: an Orion3 knee with an Elan foot, size 23 cm, narrow width, spring set 4, with the Elan charger kit (409087E). The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Order summary. User weight 84 kg at activity level 3; spring set 4 on the quote, guide gives 4; the complete prosthesis is rated to 125 kg.
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3. Linx for a heavier user: A Linx order for a 108 kg user at activity level 4

    
The agent's request. Please quote a prosthesis for an above-knee user weighing 108 kg at activity level 4: the Linx integrated limb system, size 27 cm, narrow width, spring set 8. The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • User weight over the rated maximum. The user weighs 108 kg, but the lowest-rated component on the quote limits the complete prosthesis to 100 kg at this activity level.
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  • Stated maximum weight differs. The quote states a maximum user weight of 125 kg for the complete prosthesis, but its lowest-rated component allows 100 kg.
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  • Activity level 4 needs sign-off. Activity level 4 is a bracketed rating, limited to users up to 100 kg and dependent on local reimbursement guidelines; a clinician must confirm it.
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4. Linx for a heavier user: The agent resubmits after fixing the errors

    
The agent's request. Please quote a prosthesis for an above-knee user weighing 108 kg at activity level 3: the Linx integrated limb system, size 27 cm, narrow width, spring set 7. The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Order summary. User weight 108 kg at activity level 3; spring set 7 on the quote, guide gives 7; the complete prosthesis is rated to 125 kg.
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5. Below-knee user: An order with an Orion3 knee and an ElanIC foot for a below-knee user

    
The agent's request. Please quote a prosthesis for a below-knee user weighing 72 kg at activity level 3: an Orion3 knee with an ElanIC foot, size 25 cm, narrow width, spring set 4, with the Elan charger kit (409087E). The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Knee on a below-knee user. The quote has a knee component (Linx, Orion3 or SmartIP) for a below-knee user; these knees are for above-knee users.
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  • Charger kit for a different foot. The charger kit on the quote is for a different foot; the Elan uses charger kit 409087E and the ElanIC uses the inductive IC charger kit 409087IC.
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6. Below-knee user: The agent resubmits after fixing the errors

    
The agent's request. Please quote a prosthesis for a below-knee user weighing 72 kg at activity level 3: no knee, an ElanIC foot, size 25 cm, narrow width, spring set 4, with the ElanIC inductive charger kit (409087IC). The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Order summary. User weight 72 kg at activity level 3; spring set 4 on the quote, guide gives 4; the complete prosthesis is rated to 125 kg.
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7. Activity level 2: An Orion3 and Elan order for a user at activity level 2

    
The agent's request. Please quote a prosthesis for an above-knee user weighing 62 kg at activity level 2: an Orion3 knee with an Elan foot, size 25 cm, narrow width, spring set 2, with the Elan charger kit (409087E). The quote states a maximum user weight of 125 kg for the complete prosthesis. It is ready to send.

    
Verdict: Needs approval.

    
    
      
  • Activity level 2 is a bracketed rating. Activity level 2 is a bracketed rating for these components, and the spring set is chosen by the clinician for the individual user rather than from the spring guide; a clinician must confirm it.
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  • Order summary. User weight 62 kg at activity level 2; spring set 2 on the quote, guide gives 2; the complete prosthesis is rated to 125 kg.
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Narration transcript
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The text of the narrated walkthrough, step by step.

    
    
      
  1. Welcome to a demo of Predictika's Validator. An AI sales agent prepares an order for a lower-limb prosthesis: a knee, a foot, the user's weight and activity level, and more. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the catalogue's selection rules and returns a verdict, every reason and the figures it computed.
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  2. I will start with the first request by the agent.
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  3. The agent says. Please quote a prosthesis for an above-knee user weighing 84 kg at activity level 3: an Orion3 knee. The quote states a maximum user weight of 125 kg for the complete prosthesis. The rest of the request is on screen.
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  4. Before it goes out, the agent calls the validator.
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  5. Blocked, with three findings, all in one answer. Spring set 5 is on the quote, but the spring selection guide gives set 4 for a user of 84 kg at activity level 3 (set one level lower for an above-knee user of the Elan or ElanIC, one level higher at activity level 4). Size 23 cm feet come in the narrow width only; narrow and wide are offered for sizes 25 to 28 only. The charger kit on the quote is for a different foot; the Elan uses charger kit 409087E and the ElanIC uses the inductive IC charger kit 409087IC.
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  6. The validator returned three blocking findings in one answer. A check that reads one field at a time would pass most of this; it shows only when the choices in the quote are checked against each other.
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  7. What this shows: for a spring set that depends on weight band, amputation level, foot and activity level, a rules-based CPQ can do this only with workarounds.
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  8. Now the agent resubmits.
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  9. The corrected request. It changes the foot width to narrow, the spring set to 4 and the charger kit to Elan charger kit 409087E.
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  10. It calls the validator again.
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  11. This time the validator clears it.
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  12. All three earlier findings are cleared, and the validator's figure matches the quote.
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  13. Three problems caught in one call, fixed in one pass, and a clean quote. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
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