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Case study

R&D Tax Relief for Medtech

Case study: Patient-Specific 3D-Printed Implants

Illustrative R&D Case Study

Explore how a UK medtech business could investigate a patient-specific porous implant architecture for a challenging anatomical defect. Based on published scientific and technological research, this example demonstrates how Lister AI helps businesses evaluate technical uncertainties, identify gaps in supporting evidence and improve their R&D tax relief explanations through ten guided questions.

This is an illustrative scenario, not an actual company project or HMRC claim.

Lister AI — guided questions

01

What the R&D aim of the project is

Business answer

We want to investigate a patient-specific porous implant architecture for a challenging anatomical defect.

Lister assessmentNeeds review

The objective is not yet tied to measurable technological criteria.

Lister recommended answer

We aim to investigate a patient-specific porous implant architecture for a challenging anatomical defect. Our proposed technical result is a demonstrably improved structural and biological interface under defined loading and fixation constraints. We have not yet established that this outcome was readily achievable using existing methods.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Define measurable acceptance criteria and a competent professional’s assessment of why the intended capability exceeds routine adaptation. Attach dated requirements and a baseline comparison. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We want to investigate a patient-specific porous implant architecture for a challenging anatomical defect. Specify the baseline performance and the proposed improvement using units, tolerances, operating conditions and an objective pass/fail criterion. Ask the technical lead to identify which parts of the work involve an unresolved capability rather than ordinary design, procurement or compliance. Retain the original specification and its approval date so later changes can be traced.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For the R&D aim, use this work to identify what the field had already achieved; specify a measurable capability not shown by the source, without assuming novelty. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

02

A review of the current state of knowledge

Business answer

We have seen that published clinical literature describes patient-specific 3d-printed implants and their benefits and limitations; custom geometry is already known.

Lister assessmentNeeds review

The baseline needs a traceable comparison to the specific proposed work.

Lister recommended answer

Published clinical literature describes patient-specific 3D-printed implants and their benefits and limitations; custom geometry is already known. This published work establishes existing knowledge; it does not demonstrate that our fictional company has performed experiments. We must compare the publication’s scope and limitations with our own requirements.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Prepare a dated literature table: author, year, institution, method, demonstrated capability, limitation, and the exact gap relevant to this project. Cite the source directly: The Use of Patient-Specific Implants for the Treatment of Upper Extremity Fractures (2023). For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We have seen that published clinical literature describes patient-specific 3d-printed implants and their benefits and limitations; custom geometry is already known. For every cited paper, distinguish the authors' demonstrated results from their stated limitations; do not infer that a published limitation automatically applies to this project. Record the publication date relative to the project start, the relevant experimental conditions and the nearest comparable method. Ask a competent professional to explain the remaining gap and attach the actual source passages or stable identifiers.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For current knowledge, record the publication date, experimental context, tested conditions and documented limitations. Compare these directly with the fictional project rather than asserting a research gap without evidence. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

03

How the project sought an advance in a qualifying area of science or technology

Business answer

We hope to achieve a demonstrably improved structural and biological interface under defined loading and fixation constraints.

Lister assessmentWeakly supported

An advance for the company is not necessarily an advance in the field.

Lister recommended answer

The proposed advance is a demonstrably improved structural and biological interface under defined loading and fixation constraints. We seek to establish this through systematic technical investigation, not merely a new product or routine implementation.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Explain the advance in overall science or technology, identify the nearest published approaches, and document why a competent professional could not readily deduce the result. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We hope to achieve a demonstrably improved structural and biological interface under defined loading and fixation constraints. Describe the intended improvement as a testable capability, not as novelty to the company, cost reduction or a commercial advantage. Compare the target with the strongest available published method and explain which technical inference could not readily be made. State the experimental evidence that would support or refute the proposed advance, and identify any limits on generalising the result.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For the proposed advance, explain how the targeted capability would go beyond the methods demonstrated in the cited work. Do not equate a different product design with an advance in the field. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

04

Describe exactly which uncertainties you need to resolve

Business answer

We are unsure whether a proposed porous lattice achieves the required strength and fatigue performance at its intended porosity.

Lister assessmentNeeds review

The uncertainty needs technical boundaries and a competent professional’s rationale.

Lister recommended answer

Two central uncertainties are: (1) whether a proposed porous lattice achieves the required strength and fatigue performance at its intended porosity; and (2) whether interface fixation and geometry can be made repeatable across anatomical variations. Their technological character remains to be substantiated against the baseline.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

For each uncertainty record the prior method, what was unknown, why established approaches were inadequate, a falsifiable test, and the competent professional’s explanation. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We are unsure whether a proposed porous lattice achieves the required strength and fatigue performance at its intended porosity. Express each uncertainty as a question that can be answered through investigation, with boundary conditions and observable outcomes. Separate uncertainty about scientific or technological feasibility from uncertainty about budget, schedule, customer acceptance or supplier availability. Record what a competent professional knew at the outset, the alternatives considered and the evidence needed to resolve each question.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For uncertainty, isolate the unresolved technical question and contrast it with the published method’s demonstrated operating range and limitations. Obtain a competent professional’s explanation. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

05

Describe what made it a project to resolve a specified uncertainty

Business answer

We began because existing custom implants do not by themselves resolve the competing requirements of porosity, fit and mechanical durability.

Lister assessmentWeakly supported

Commercial necessity or customisation alone is not qualifying R&D.

Lister recommended answer

The investigation was proposed because existing custom implants do not by themselves resolve the competing requirements of porosity, fit and mechanical durability. A customised solution alone would not be enough to show qualifying R&D.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Attach feasibility assessments and alternatives considered; distinguish routine configuration, commercial risk and scientific or technological uncertainty. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We began because existing custom implants do not by themselves resolve the competing requirements of porosity, fit and mechanical durability. Reconstruct the decision to begin the investigation using dated feasibility notes, early calculations and the team's prior-knowledge review. Explain why straightforward application or adaptation of existing methods could not settle the issue. Identify the point where routine engineering ended and the experimental investigation began, and record the competent professional who made that judgement.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For the reason to undertake R&D, document why applying the published approach was not readily sufficient and which alternative approaches were considered before experimentation. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

06

Describe the steps you plan to take to resolve them

Business answer

We plan to review prior implants; model loads; manufacture coupon and representative samples; mechanical test; compare fit and repeatability.

Lister assessmentSupported

A sequence of tasks is insufficient unless it tests identified uncertainty.

Lister recommended answer

The proposed work is to review prior implants; model loads; manufacture coupon and representative samples; mechanical test; compare fit and repeatability. Each stage is intended to test a specific technical assumption rather than simply deliver the product.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Map each step to an uncertainty, a test or model, an acceptance threshold, a dated record, and a decision to continue, revise or stop. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We plan to review prior implants; model loads; manufacture coupon and representative samples; mechanical test; compare fit and repeatability. For each proposed activity, name the hypothesis, variables to change, controls to hold constant, measurement method and decision criterion. Preserve failed iterations as well as promising ones, with versioned models, protocols and test data. Distinguish planned steps from completed work; update the sequence when the project changes instead of rewriting the original plan retrospectively.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For the planned steps, use the publication’s method or evaluation measures as a technical comparator, while documenting the business’s own test plan, controls and acceptance criteria. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

07

What difficulties are foreseen for the project

Business answer

We anticipate manufacturing defects, anisotropy, fatigue, fixation stability and biocompatibility.

Lister assessmentNeeds review

Foreseeable risks must be distinguished from technological uncertainty.

Lister recommended answer

The foreseeable difficulties include manufacturing defects, anisotropy, fatigue, fixation stability and biocompatibility. Some are routine risks; the company must identify which are linked to uncertainty beyond established capability.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Separate engineering execution risks from unresolved scientific or technological questions; document the effect each may have on experimental validity. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We anticipate manufacturing defects, anisotropy, fatigue, fixation stability and biocompatibility. Rank the foreseen technical obstacles by their effect on interpreting experimental results, and describe a mitigation or diagnostic test for each. Distinguish predictable implementation problems from limitations of existing scientific or technological knowledge. Record assumptions, expected failure modes, equipment constraints and the observations that would indicate the underlying uncertainty remains unresolved.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For foreseeable difficulties, distinguish limitations described by the authors from risks specific to the business. Explain how each could affect the proposed capability. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

08

Information about any major changes to the aims, or new uncertainties encountered while running the project

Business answer

We might need to change the design.

Lister assessmentNeeds review

A hypothetical design change cannot be represented as actual evidence.

Lister recommended answer

Illustrative change scenario, NOT an actual project result: an initially promising lattice shows an unexpected fatigue weakness at a transition region. This may require revisiting the original technical assumptions.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Replace this scenario with actual dated records. State the original assumption, new evidence, design change, and whether a new uncertainty genuinely arose. If none occurred, say so. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We might need to change the design. Use a dated change log to connect each unexpected observation to the original hypothesis and the resulting technical decision. Include the version of the design or protocol affected, the alternative explanation considered and the follow-up test proposed. Do not invent a new uncertainty merely to strengthen a claim; explicitly record 'none identified' if the actual project produced no new technological question.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For changes or newly discovered uncertainties, use the publication only as background; date and substantiate every actual design change or unexpected finding with company records. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

09

How the uncertainties and other challenges were overcome (or not)

Business answer

We expect the design to improve.

Lister assessmentWeakly supported

An expected result is not a demonstrated resolution.

Lister recommended answer

No project results have been supplied. The business would need to compare measured fatigue and strength with defined limits; state whether each uncertainty is resolved. It must explicitly state which uncertainties were resolved, partially resolved or remained open.

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Do not claim success or failure without results. Supply raw measurements, controls, repeatability, acceptance criteria, deviations and a competent professional’s conclusion. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We expect the design to improve. For every uncertainty, state separately whether it was resolved, partly resolved or unresolved and identify the test evidence behind that status. Include negative findings, measurement error, sample size or repeatability where relevant, and any difference between simulated and observed behaviour. Do not convert a proposed target into a claimed achievement; have the competent professional sign off the interpretation of actual records.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For outcomes, do not infer success from the publication. Compare the company’s actual measured results with the literature baseline, identify unresolved questions and report negative results. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/

10

Details of any patent applications filed, or how any resultant, identified intellectual property is to be protected

Business answer

We may protect any new intellectual property.

Lister assessmentNeeds review

IP filing is not an R&D eligibility test.

Lister recommended answer

No application is assumed; assess design ownership and patentability separately from clinical or tax eligibility

Published references
  1. Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024), University Hospital Münster / University of Applied Sciences Münster, Germany: https://pubmed.ncbi.nlm.nih.gov/38536566/
How Lister reached this

Confirm the actual patent/application number and filing date if any. If none, say “No patent application filed”; explain any relevant confidentiality or other IP protection without suggesting that IP proves R&D eligibility. For the patient-specific 3d-printed implants investigation, relate this specifically to the business's stated issue: We may protect any new intellectual property. Separate an invention disclosure, an internal confidentiality decision and an actual patent filing; they are not interchangeable. If a filing exists, verify the application identifier, jurisdiction, date and the precise technical subject covered. If there is no filing or protectable result, state that plainly. Keep IP decisions distinct from the assessment of scientific or technological uncertainty and qualifying expenditure.

Published baseline: Quality assurance of 3D-printed patient specific anatomical models: a systematic review (2024; University Hospital Münster / University of Applied Sciences Münster, Germany) — distinguishes segmentation, digital editing and printing error; concerns anatomical models rather than implant clinical performance. For intellectual property, use the literature to check existing public disclosures and potential prior art; do not imply that a patent application was filed or that patentability has been established. Source: https://pubmed.ncbi.nlm.nih.gov/38536566/