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Hannan Snap Visor

Open source flatpack full face visor.

Last Updated: 16/04/2020

Share Link : https://tinyurl.com/hannan-visor

As part of a national response to help the NHS during the Coronavirus pandemic. Open Lab, Newcastle University and Northumbria University partnered with AMAP, Sunderland University to design and develop a low cost, flatpack full face visor. The final output of this over the course of a 6 day design sprint was the Hannan Snap Visor.

Visor Render

Open Lab; Newcastle University; Northumbria University; AMAP, University of Sunderland

Summary

In honour of Katherine Hannan, a nurse went out of her way to be at the very front lines of caring for the sick during the Spanish Flu pandemic. The Hannan visor is a low cost full face visor designed for single sessional use. Manufactured from Polypropylene and PVC, parts come flat-packed, and can be sterilised then assembled in 1-2 minutes. The head strap is fully adjustable and allows the user the ability to wear full Personal Protective Equipment (PPE) during use.

The design originated from a laser cut version concept by Smoke N Mirrors March 28, 2020. After analysis and testing with healthcare workers the visor was completely redesigned to allow for the ability to manufacture via die-cutting. This could allow the visor to be produced at scale and speed.

The design has been through a series of iterations and testing with NHS healthcare workers at NHS trusts as well as with GPs in the local area. Design modifications include new visor to cover face including the upper forehead preventing any aerosol or spatter to access from above. A redesigned adjustable "barbed" headband allowing the user to pull tightly with one hand, locking the visor in place.

Version Date Release Notes
v1.1 12/04/2020 Open source files released
v1.2 14/04/2020 Updated legal compliance
v1.3 16/04/2020 Added modified die-cut tools with part numbers + removable CE mark

Full face visor

Compliance

The design of this product conforms with relevant essential health and safety regulations under the PPE Regulations and with requirements of BS EN 166:2002 (Personal eye protection).

The manufacturer assumes responsibility for all compliance requirements including conformity assessment and CE certification and marking. No assurance is given or implied by publication of the design (whether by way of representation, warranty, undertaking or otherwise), and the designers shall have no liability, in respect of the operation, quality, functionality, fitness for purpose or performance of the product.

NO REPRESENTATION, PROMISE OR WARRANTIES, EITHER EXPRESS OR IMPLIED, IS GIVEN CONCERNING THE SUITABILITY OF THESE FACE SHIELDS FOR ANY MEDICAL OR PERSONAL PROTECTION USE INCLUDING, WITHOUT LIMITATION, THEIR EFFECTIVENESS TO FILTER, BLOCK OR PROTECT AGAINST ANY PATHOGEN OR PARTICLE INCLUDING SARS-COV-2 OR ANY OTHER RELATED TO COVID-19.

BS EN 166:2002

For visors this would include requirements for:

  • an adjustable head band arrangement.
  • Safety visors need to be fog free.
  • All products need to be latex free.
  • Any product that contains phthalates must be indicated on the packaging in accordance with: Medical Devices Regulation 2017/745. Personal Protective Equipment
  • All products must have their CE marking clearly evident on the product and/or packaging and must conform to the relevant directive: Medical Devices Regulation 2017/745

Specification

Parameter Value Notes
Visor Size 338mm x 285mm (w) x (h)
Visor Weight 55g
Material PVC / Polypropylene
Usage Multiple or Single Session Must be resterilised
Assembly Time Approx 1-2 mins
Visor
- Material 400 Micron PET, 400 Micron PVC REACH Certified
- Impact strength, min. 550 kJ/m/s DIN EN ISO 8256 measured lengthwise
Head Band / strap
- Material 450 Micron Polypropylene - Black
- Head Sizing Approx 53.5cm - 73.8cm (21" - 29") Barbed locking mechanism & hook
Addtional
- STERILISATION REQUIRED* Method: Clinell Wipes or Isopropyl alcohol 70% * All visors are shipped unsterilised

Manufacture

The following design has been intended for manufacture through die-cutting. The design can also however be made through laser-cutting. We have trialled several prototypes through this manner.

PLEASE NOTE: Do not laser process any PVC. This is dangerous and may damage your machinery through the release of Hydrogen Chloride. Please use alternative materials for the clear visor such as PET.

The is made from one of two types of material:

  • PVC - The clear visor area
  • PP - The adjustable head strap and mount for the clear visor.

The visors can be shipped flatpacked and assembled via the end user using a series of "IKEA style" textless instructions for assembly as seen below. When distributing this design or visor, ensure that the end user has a copy of both the data sheet and the instructions.

Instructions Grid

Sterilisation

YOU MUST STERILISE THESE VISORS PRIOR TO USE. They are designed to be shipped straight from manufacture and it is the recipients responsibility to sterilise the visor.

The standard method of cleaning is to use a detergent product either combined/ sequentially with a decontamination product as agreed by the local infection prevention and control (IPC) specialists.

They should be rinsed thoroughly to remove any residual detergent or cleaning product and left to dry.

While this process is likely to be specific to each organisation, there are a few ways you can achieve this. The primary method for the NHS currently uses Clinell Wipes. Clinell Wipes are a mixture of chlorhexidine gluconate and isopropyl alcohol 70% and have a usage time of 60s before needing to be dicarded.

While Polypropylene and PET can be technically autoclaved. This method has NOT been tested with this design.

Usage

Recipients of the face shields are responsible for using their own judgement before deciding to order, receive, distribute and use these homemade face shields in any setting. Prior to use these visors should be sterilised. These face shields are single sessional use only. Discard after use. It is expected that these face shields will be used in conjunction with a face mask protecting the nose and mouth, in accordance with relevant guidelines. Face shields are not a replacement for or negate the need for users to continue to stringently follow the recommended hygiene practices or other relevant guidelines.

Open Source Design

This design has been open sourced under the Open Movement platform at Newcastle University in collaboration with Northumbria University. The hardware (designs, layouts and schematics), and documentation are available under a Creative Commons 3.0 BY Attribution License.

Documents

Technical Drawings

Die-Cut Tooling

The following documents are designed to show possible die cut layouts for manufacture. These files include a removable CE mark embossing as we are currently exploring the possibility to CE Mark the visor and it allows flexibilty in the tool. It must therfore be repeated that this deisgn is NOT CE MARKED and you should remove this feature should you choose to manufacture this design yourself.

Part number and batch number "A-88" are to be embossed on the visor. The "88" allows for blades to be removed to create monospace numbers ranging from 0-9 similar to that on a digital clock.

Contact

For more information or help with the Hannan Visor please contact:

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