INSULATED REGIONAL BLOCK NEEDLES

Computer-based finite element modeling of insulated Tuohy needles used in regional anesthesia.

BACKGROUND Differences in needle design may impact nerve localization. This study evaluates the electrical properties of two insulated Tuohy needles using computational finite element modeling. METHODS Three-dimensional geometric computer-based models were created representing two 18-gauge, insulated Tuohy needles: (1) with an exposed metal tip and (2) with an insulated tip. The models were p...

Syringomas Treated by Intralesional Insulated Needles without Epidermal Damage.

Syringoma is a benign adnexal tumor derived from intradermal eccrine ducts; it predominantly occurs in women at puberty or later in life. Although syringoma is a common benign neoplasm, there have been no effective therapies for its removal. Conventional therapies for syringomas, including surgical excision, electrodessication, chemical peeling, topical atropine or tretinoin, cryosurgery, and l...

Ophthalmic regional block.

Cataract surgery is the commonest ophthalmic surgical procedure and a local anaesthetic technique is usually preferred but the provision of anaesthesia in terms of skills and resources varies worldwide. Intraconal and extraconal blocks using needles are commonly used. The techniques are generally safe but although rare, serious sight- and life-threatening complications have occurred following t...

Voltage fields surrounding needles used in regional anaesthesia.

Using a bench model, we have studied the voltage fields surrounding both insulated and uninsulated needles used in regional anaesthesia. The findings were compared with earlier computer predictions which suggested that the fields would be markedly different for the two types of needle. The results confirm that the fields differ markedly and suggest that the use of insulated needles may not nece...

Regional block analgesia.