Early years in artificial valve development

Area of Science:

• Biomedical Engineering
• Cardiovascular Surgery
• Materials Science

Background:

• Development of prosthetic heart valves began in the laboratory in 1958.
• Early clinical trials involved patients with congestive heart failure undergoing valve replacement surgery.

Observation:

• Seven prosthetic valves were implanted clinically in 1958 and 1959.
• The longest survival period observed in these initial cases was 6 weeks.
• Complications included thrombosis, thromboembolism, and tissue overgrowth affecting valve function.

Findings:

• Coating Teflon leaflet valves with a polyurethane film significantly reduced thrombosis.
• Applying polyurethane to fixation rings of disc valves decreased thromboembolism.
• This coating also mitigated tissue overgrowth, thereby improving valve performance.

Implications:

• Polyurethane coatings represent a critical advancement in early prosthetic heart valve design.
• These findings paved the way for more durable and effective long-term cardiac valve replacements.
• The study highlights the importance of material surface modification in preventing biological complications.