Surgeons at NHS Trust hospitals across the UK are now using 3D-printed models to rehearse surgeries
Surgeons at NHS Trust hospitals across the UK are now using 3D-printed models to ensure implants used in replacement and reconstructive surgeries will fit.Replica 3DM

UK medical 3D-printing specialist Replica 3DM is using Stratasys 3D printers to provide 12 NHS trust hospitals with models to allow surgeons to test implants and plan surgeries, before operations begin.

Replica 3DM was started about two years ago. To start with it provided Salisbury District Hospital with a medical 3D-printing service in a new department.

"We wanted to set up a 3D-printing hub for hospitals who can't afford the 3D-printing equipment or can't justify it as their 3D model numbers are so low," Replica 3DM managing director Matthew Sherry told IBTimes UK.

"We thought we could set up the service to benefit the trusts and we thought we could do it cheaper and better."

The partnership with Salisbury was so successful that Replica 3DM's services are now used by 12 NHS trust hospitals across England, and the firm is also working with NHS Innovations to create new medical equipment.

Most commonly requested 3D models

The models that the hospitals commonly request include jaw bones, for facial reconstruction surgery; elbows; hip revision models, to rehearse repairing hip replacements; forearms, to repair deformed bones; and cranial plastics, whereby the surgeon has to fit a titanium implant to a hole in a person's skull.

The 3D models have also been used in orthopedics, neurology, spinal and ears, nose and throat wards, so that surgeons can identify the best procedure to use before surgery, which has cut down surgery time and hospital costs dramatically.

Replica 3DM's 3D-printed models
Replica 3DM's 3D-printed models:
Upper row: A 3D-printed model of a patient's hip joint, which is used to test the suitability of new prosthetic joint, before a hip revision operation.
Bottom row: A titanium plate being tested on a 3D-printed skull, (pictured on the right).

(Replica 3DM and Dr Steve Veitch, Salisbury District Hospital)

"As demonstrated in a recent maxillofacial procedure [surgery on face and jaw bones] at Salisbury District Hospital, the ability to pre-bend the titanium plate prior to surgery enabled surgeons to secure the perfect custom fit. This reduced the number of incisions required and overall theatre time, directly impacting the quality of patient care," said Sherry.

"With theatre typically costing around £3,600 an hour, you can imagine how much we save NHS trusts. In most cases, a model will pay for itself, and helps with essential pre-operative surgical planning."

Streamlining the 3D modelling process

Replica 3DM has two Stratasys printers – the Objet24 and the Objet30 – as well as a customised PLA extrusion printer. The printers are able to print out models of bones in polymer acrylic as well as 'ninja flex', a type of soft rubber used to print models of organs and other softer tissues.

An example of a Stratasys Objet24 3D printer
A Stratasys Objet24 3D printer.Stratasys

The firm also has access to 3D printers owned by Southampton University, which are able to print various types of metal, such as titanium, which is commonly used in surgical implants.

"We write in-house software that makes it faster to take a patient's CT scan and make it 3D-print ready, which can be tricky," explained Sherry. "Without the software, it would take three to four hours to print a jaw bone using off-the-shelf software, provided you had the right computing speed and medically-approved software.

"But with our software, it takes us 40 minutes to make the 3D model ready, and it only takes that long because 99% of patients have fillings in their teeth, and the fillings cause an artefact in the CT scan which we have to remove."

The hospitals using Replica 3DM's 3D-printing services include:

  • Southampton General Hospital
  • Salisbury District Hospital
  • Poole Hospital
  • Bournemouth Royal Hospital
  • Queen Alexandra Hospital, Portsmouth
  • Russell Hall Hospital, Birmingham
  • Royal Gloucester Hospital
  • Aintree Hospital
  • Preston Hospital
  • Royal Surrey County Hospital
  • The Shrewsbury and Telford Hospital, and
  • Torbay Hospital, South Devon