Rectangular cymbal arrays for improved ultrasonic transdermal insulin delivery

Area of Science:

• Biomedical Engineering
• Ultrasound Technology
• Pharmacology

Background:

• Circular cymbal ultrasound arrays have demonstrated efficacy in transdermal insulin delivery across multiple animal models.
• Improving delivery efficiency is crucial for therapeutic applications, necessitating novel device designs.
• Rectangular cymbal arrays offer potential for broader spatial intensity fields without increasing device size or peak intensity.

Purpose of the Study:

• To evaluate the performance of a 3x1 rectangular cymbal ultrasound array compared to a 3x3 circular array for glucose reduction in hyperglycemic rabbits.
• To determine if the rectangular design offers significantly improved transdermal insulin delivery efficiency.

Main Methods:

• Hyperglycemic rabbits were divided into three groups: control (no sonication), circular array sonication, and rectangular array sonication.
• Insulin was delivered via a reservoir attached to the rabbit's thigh, with blood glucose levels monitored over 90 minutes.
• Blood glucose levels were normalized to baseline for inter-animal comparison.

Main Results:

• The control group showed an increase in normalized glucose levels (+80.0+/-28.8 mg/dL).
• The circular array resulted in a glucose decrease to -146.7+/-17.8 mg/dL at 90 minutes.
• The rectangular cymbal array demonstrated a faster and greater glucose reduction, reaching -200.8+/-5.9 mg/dL after 90 minutes.

Conclusions:

• The rectangular cymbal ultrasound array is a feasible and improved device for transdermal drug delivery.
• This novel design enhances therapeutic efficiency for glucose reduction in hyperglycemic models.
• Further research into rectangular cymbal arrays could advance ultrasound-mediated drug delivery systems.