Intradermal delivery of substances

Abstract

A method for administration of a substance into the dermis of a mammal is disclosed. The method involves administration into the dermis by injection which results in improved systemic absorption relative to that obtained upon subcutaneous administration of the substance. The substance administered may be a growth hormone, a low molecular weight heparin or a dopamine receptor agonist.

Description

[0001] This application is a continuation-in-part of U.S. application Ser. No. 09 / 606,909 filed Jun. 29, 2000.[0002] The present invention relates to methods and devices for administration of substances into the intradermal layer of skin.[0003] The importance of efficiently and safely administering pharmaceutical substances such as diagnostic agents and drugs has long been recognized. Although an important consideration for all pharmaceutical substances, obtaining adequate bioavailability of large molecules such as proteins that have arisen out of the biotechnology industry has recently highlighted this need to obtain efficient and reproducible absorption (Cleland et al., Curr. Opin. Biotechnol. 12: 212-219, 2001). The use of conventional needles has long provided one approach for delivering pharmaceutical substances to humans and animals by administration through the skin. Considerable effort has been made to achieve reproducible and efficacious delivery through the skin while impr...

AI Technical Summary

Benefits of technology

[0012] The present disclosure relates to a new parenteral administration method based on directly targeting the dermal space whereby such method dramatically alters the pharmacokinetics (PK) and pharmacodynamics (PD) parameters of administered substances. By the use of direct intradermal (ID) administration means hereafter referred to as dermal-access means, for example, using microneedle-based injection and infusion systems (or other means to accurately target the intradermal space), the pharmacokinetics of many substances including drugs and diagnostic substances, which are especially protein and peptide hormones, can be altered when compared to traditional parental administration routes of subcutaneous and intravenous delivery. These findings are pertinent not only to microdevice-based injection means, but other delivery methods such as needless or needle-free ballistic injection of fluids or powders into the ID space, Mantoux-type ID injection, enhanced iontophoresis through microdevices, and direct deposition of fluid, solids, or other dosing forms into the skin. Disclosed is a method to increase the rate of uptake for parenterally-administered drugs without necessitating IV access. One significant beneficial effect of this delivery method is providing a shorter T.sub.max.(time to achieve maximum blood concentration of the drug). Potential corollary benefits include higher maximum concentrations for a given unit dose (C.sub.max), higher bioavailability, more rapid uptake rates, more rapid onset of pharmacodynamics or biological effects, and reduced drug depot effects. According to the present invention, improved pharmacokinetics means increased bioavailability, decreased lag time (T.sub.lag decreased T.sub.max, more rapid absorption rates, more rapid onset and / or increased C.sub.max for a given amount of compound administered, compared to subcutaneous, intramuscular or other non-IV parenteral means of drug delivery.

Problems solved by technology

Many current attempts at preparing "closed loop" insulin pumps are hindered by the delay period between administering the insulin and waiting for the biological effect to occur.

This makes it difficult to ascertain in real-time whether sufficient insulin has been given, without overtitrating and risking hypoglycemia.

Images