Anchor systems and methods
Some embodiments of a medical device anchor system include an anchor device that receives a medical instrument (such as a catheter or the like) and secures the instrument in place relative to a skin penetration point. In some circumstances, the anchor device may allow the anchor device to be used after medical instrument is already in place without the need for a second penetration point for the anchor device.
1. A method for securing a catheter relative to a skin penetration point, comprising:
inserting the catheter through a skin penetration point;
inserting first and second anchors of an anchor instrument through the skin penetration point while the catheter is occupying the penetration point, the first and second anchors being coupled to an external retainer device of the anchor instrument and being configured to extend distally away from a distal end of the external retainer device, wherein a first subcutaneous flexible tine of the first anchor and a second subcutaneous flexible tine of the second anchor are deployed in a subcutaneous region adjacent to an underside of a skin layer to secure the external retainer device relative to the skin penetration point;
releasably engaging the external retainer device to an external portion of the catheter while the catheter is occupying the skin penetration point and while the first and second anchors extend distally away from the distal end of the external retainer device, wherein the external retainer device provides a channel that frictionally engages with at least a portion of an outer surface of the catheter; and
wherein the first and second subcutaneous flexible tines are positioned distal to the distal end of the external retainer device while deployed in the subcutaneous region adjacent to the underside of the skin layer and while the external retainer device resides fully external to the skin penetration point.
2. The method of claim 1 , wherein said releasably engaging the external retainer device to an external portion of the catheter comprises connecting a removable cap member of the external retainer device with extension elements of the external retainer device so that the removable cap member frictionally engages with the portion of the outer surface of the catheter.
3. The method of claim 2 , wherein the channel provided by the external retainer device comprises a flexible gripping material that is compressed against the external portion of the catheter when the external retainer device releasably couples to the catheter.
4. The method of claim 3 , wherein the cap member is more rigid than that the flexible gripping material of the retention portion of the external retainer device.
5. The method of claim 2 , wherein the cap member defines apertures that releasably receive the extension elements of the external retainer device when the external retainer device releasably couples to the catheter.
6. The method of claim 1 , wherein each of the first and second subcutaneous flexible tines is curved.
7. The method of claim 6 , wherein the first and second subcutaneous flexible tines are curved tines having a convexly curved portion that extends longitudinally toward a non-sharp free end.
8. The method of claim 1 , wherein said inserting the first and second anchors of the anchor instrument through the skin penetration point comprises adjusting the first and second anchors from a first configuration to a deployed configuration in which the first and second subcutaneous flexible tines extend outwardly away from one another.
9. The method of claim 8 , further comprising an actuator mechanism to adjust the first and second anchors from the first configuration to the deployed configuration.
10. The method of claim 8 , wherein the first anchor includes a first external longitudinal shaft portion extending in a longitudinal direction distally away from the distal end of the external retainer device toward the first subcutaneous flexible tine when the first anchor is in the deployed configuration, and wherein the second anchor includes a second external longitudinal shaft portion extending in the longitudinal direction distally away from the distal end of the external retainer device toward the second subcutaneous flexible tine when the second anchor is in the deployed configuration.
11. The method of claim 8 , wherein the first external longitudinal shaft portion of the first anchor and the second external longitudinal shaft portion of the second anchor extend generally parallel to another and generally side-by-side to one another.
12. The method of claim 1 , further comprising adjusting positions of the first and second anchors relative to one another during removal of the first and second anchors from the subcutaneous region.