Pre-operational Tool

HOLOVALVE - precision for safety

About Holovalve

The HoloValve app is a Hololens 2 application for Mixed Reality visualization and manipulation of 3D DICOMs of heart and 3D models of artificial heart valves. 

The main purpose of this application is to help surgeons who specialize in the installation of artificial valves decide on a specific model, by comparing it to a 3D heart scan of a patient.

They then decide which valve model suits him best and in which position TMVI (transcatheter mitral valve implantation) surgery should be performed. The main application is for quality preoperative preparation, but it can also be used for research and education.

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Dr Gry Dahle

IVS at the Oslo University Hospital

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Dr Henrik Brun

IVS at the Oslo University Hospital

Current Status

The Interventional Centre at the Oslo University Hospital required the app to be developed in Unity as a standalone app. It is now in clinical trials and we are developing new concepts to even further automatize some aspects of imports/exports, recognition of annulus area and measurements, including connectivity with the hospital information system. We are also considering enlargement of the spectrum of artificial valves used in pre-operational procedures. The current status of the app can be seen here by clicking on the video below.

Annulus

neoLVOT area

Angling & Clocking

Annulus

neoLVOT area

Angling & Clocking

Benefits

HoloValve app significantly decreases time needed to perform all necessary measurements and choose appropriate artificial valve to under 10 minutes. The current development stage presumes that 3D DICOMs are prepared by a radiologist and imported in the standalone HoloValve app for further manipulations. Measurements are semi-automatized and performed continuously during the procedure, without a need for dotting specifical areas. The prototype is currently in clinical trials at the IVS (Oslo University Hospital).

Measurements

Surgeon now can quickly measure angles against the axial and sagittal planes needed for the delivery device in operational procedure, clocking of the valve for best fitting of valve, all annulus area parameters (perimeter, SC, IC) and finally the surface of a neoLVOT area. NeoLVOT area measurement is performed continuously during positioning of the valve, without need to restart calculations after each change of position.

Import & Reports

Surgeons may import prepared DICOMs of a patient’s heart and rib cage from a USB or remote location, as well as a library of 3D scans of artificial valves of different sizes. Then specific measurements are performed, gathering necessary parameters and creating a PDF report with all data needed for the operational procedure, including the best fitting valve. Such a report then may be shared via Bluetooth or stored at a specific location within the hospital information system.