Perspective on fluid and solid dynamics in different pars plana vitrectomy systems.
OBJECTIVE
To summarize current concepts and recent data from the literature about different vitrectomy machines and small-gauge systems based on physical laws.


METHODS
Interpretive essay.


METHODS
Review and synthesis of selected recent literature with interpretation and perspective.


RESULTS
Pars plana vitrectomy can be performed with a wide variety of treatment strategies, for multiple diseases, and with different materials (solids and fluids). We discuss a variety of machines and system settings (peristaltic pump, duty cycle, aspiration, and infusion controls) targeting safer and the most effective surgery with detailed explanations of the physical properties.


CONCLUSIONS
Effective management of new surgical strategies is based on recognizing and addressing various physical characteristics in disease and ocular settings. Although the properties of machine are expanding, the long-term efficacy and safety of most new approaches have yet to be established in controlled clinical trials.
Department of Ophthalmology, Paulista School of Medicine, Vision Institute, Federal University of São Paulo, São Paulo, Brazil. octavianomj@terra.com.br
Octaviano
O
Magalhães
Mauricio
M
Maia
Eduardo B
EB
Rodrigues
Leonardo
L
Machado
Elaine F
EF
Costa
André
A
Maia
Milton N
MN
Moares-Filho
Eduardo
E
Dib
Michel Eid
ME
Farah
D001696:Biomechanical Phenomena; D006801:Humans; D057446:Hydrodynamics; D008866:Microsurgery / Q000295:instrumentation* / Q000379:methods; D013396:Suction; D014821:Vitrectomy / Q000295:instrumentation* / Q000379:methods; D057586:Vitreoretinal Surgery