Devices, systems and methods for extracting bodily fluid and monitoring an analyte therein
An interstitial fluid (ISF) extraction device includes a penetration member configured for penetrating a target site of a user's skin layer and, subsequently, residing in the user's skin layer and extracting an ISF sample therefrom and at least three concentrically-arranged pressure rings, each adapted for applying pressure to the user's skin layer in the vicinity of the target site while the penetration member is residing in the user's skin layer. In addition, the ISF extraction device is configured such that (i) the pressure rings apply pressure in an oscillating manner with asymmetric deployment and retraction cycles and (ii) only one of the at least three concentrically-arranged pressure rings is deployed at a time, thereby mitigating an ISF glucose lag of the ISF sample extracted by the penetration member.
1. An interstitial fluid (ISF) extraction device comprising:
a penetration member configured for penetrating a target site of a user's skin layer and, subsequently, residing in the user's skin layer and extracting an ISF sample therefrom; and
at least three concentrically-arranged pressure rings, each of the at least three concentrically-arranged pressure rings adapted for applying pressure to the user's skin layer in the vicinity of the target site while the penetration member is residing in the user's skin layer,
wherein the ISF extraction device is configured such that the at least three concentrically-arranged pressure rings apply pressure in an oscillating manner with asymmetric deployment and retraction cycle timing, and
wherein only one of the at least three concentrically-arranged pressure rings is deployed at a time, whereby an ISF glucose lag of the ISF sample extracted by the penetration member is mitigated.
2. The ISF extraction device of claim 1 , wherein the ISF extraction device is configured such that the at least three concentrically-arranged pressure rings are capable of applying the pressure in an oscillating manner wherein the pressure is applied for a time period in the range of three seconds to three hours, the pressure is subsequently removed for a time period in the range of three seconds to three hours and then the pressure is re-applied for a period in the range three seconds to three hours.
3. The ISF extraction device of claim 1 , wherein the penetration member is configured to reside in the user's skin layer for a period of at least 1 hour.
4. The ISF extraction device of claim 1 , wherein the at least three concentrically-arranged pressure rings are configured to apply a pressure in the range of 0.1 to 150 pounds per square inch to a user's skin layer.
5. A method for extracting interstitial fluid (ISF), the method comprising:
providing an ISF fluid extraction device that includes a penetration member and at least three concentrically-arranged pressure rings;
contacting the pressure ring with a user's skin layer;
penetrating the user's skin layer with the penetration member; and
extracting an ISF sample from the user's skin layer with the penetration member while applying pressure to the user's skin layer in an oscillating manner using the at least three concentrically-arranged pressure rings with asymmetric deployment and retraction cycle timing, and
wherein only one of the at least three concentrically-arranged pressure rings is deployed at a time and such that an ISF glucose lag of the ISF sample extracted by the penetration member is mitigated.
6. The method of claim 5 , wherein the extracting step includes applying pressure in an oscillating manner wherein the pressure is applied for a time period in the range of three seconds to three hours, the pressure is subsequently removed for a time period in the range of three seconds to three hours and then the pressure is re-applied for a period in the range three seconds to three hours.