System for anchoring medical devices
Some embodiments of a medical device anchor system include an anchor device that receives a catheter (or other medical instrument) and secures the catheter in place relative to a skin penetration point. In some embodiments, the anchor device can secure the catheter in an operative position relative to the skin without the use of sutures or skin tapes. In particular embodiments, the anchor device can be adjusted to a folded condition so that subcutaneous anchors are partially rotated prior to removal from the skin penetration point.
1. An anchor system for securing the position of a catheter, comprising:
an anchor device configured to releasably secure to an external portion of a catheter while another portion of the catheter occupies a skin opening, the anchor device including:
a retainer base comprising a flexible hinge region having an upwardly facing channel to frictionally engage with the external portion of the catheter, and one or more subcutaneous anchors that are positioned distally from a distal end of the retainer base to anchor in the skin opening, each anchor comprising: a longitudinal shaft portion that extends in a distal direction to a position that is distal of the distal end of the retainer base, and a flexible tine that deploys in a subcutaneous region to secure the retainer base relative to the skin opening,
wherein each flexible tine of said one or more subcutaneous anchors is pivotable along the flexible hinge region about a pivot axis that extends below the upwardly facing channel of the flexible hinge region so as to adjust said one or more subcutaneous anchors from a deployed configuration to a removal configuration.
2. The anchor system of claim 1 , wherein said one or more subcutaneous anchors extend distally from the distal end of the retainer base such that the retainer base is arranged external to the skin opening when each flexible tine of said one or more subcutaneous anchors is deployed in the subcutaneous region.
3. The anchor system of claim 1 , wherein a first body portion of the retainer base is pivotable about the pivot axis defined by the flexible hinge region relative to a second body portion of the retainer base while the first and second body portions remain physically coupled to one another, and said one or more subcutaneous anchors comprise a first anchor of coupled to the first body portion and a second anchor coupled to the second body portion.
4. The anchor system of claim 3 , wherein the first body portion and the second body portion of the retainer base are formed as a single component that is bendable along the pivot axis so as to pivot the first body portion relative to the second body portion.
5. The anchor system of claim 3 , wherein the flexible tines of the first and second anchors are rotated about 75-degrees to about 105-degrees when the first and second anchors are adjusted from the deployed configuration to the removal configuration.
6. The anchor system of claim 1 , wherein said one or more subcutaneous anchors comprise a metallic material that exhibits superelasticity when used in a human body.
7. The anchor system of claim 1 , further comprising a flexible sleeve to fit over an outer circumferential surface of the external portion of catheter when the retainer base releasably secures with the catheter.
8. The anchor system of claim 1 , wherein the flexible hinge region of the retainer base extends for a full longitudinal length of the retainer base.
9. The anchor system of claim 1 , wherein each of the subcutaneous anchors extends distally forward from the distal end of the retainer base in an amount sufficient to be insertable through the same skin opening occupied by the catheter when the retainer body releasably secures to the catheter.
10. The anchor system of claim 1 , wherein each of the subcutaneous anchors comprises the longitudinal shaft portion and the flexible tine which extends outwardly away from the pivot axis toward a free end.
11. The anchor system of claim 1 , wherein the free end of each anchor comprises a rounded dull tip.
12. The anchor system of claim 1 , wherein the anchor device further comprises a cap releasably mountable to the retainer body so as to define a covered channel between the cap and the upwardly facing channel of the retainer body for engagement with the external portion of the catheter.
13. The anchor system of claim 12 , wherein the upwardly facing channel of the flexible hinge portion and the cap each include a complaint gripping surface configured to frictionally engage the external portion of the catheter in the channel.
14. The anchor system of claim 13 , wherein the flexible hinge portion is defined by a compliant material that also defines the complaint gripping surface of the upwardly facing channel.
15. The anchor system of claim 12 , wherein the covered channel is at least partially defined by a wall comprising a compliant material configured to press against the external portion of the catheter.
16. The anchor system of claim 1 , wherein each of the one or more subcutaneous anchors extends distally of a distalmost face of the retainer base so as to be positioned to insert through the same skin opening as the catheter when the retainer body releasably secures to the catheter.
17. The anchor system of claim 1 , wherein the longitudinal shaft portion of each anchor extends distally of a distalmost face of the retainer base so as to be positioned to insert through the same skin opening as the catheter when the retainer body releasably secures to the catheter.
18. The anchor system of claim 1 , further comprising a delivery device to advance the anchor device toward the skin opening.
19. The anchor system of claim 18 , wherein the delivery device defines an internal space and a distal opening, the anchor device being deployable from the internal space of the delivery device.
20. The anchor system of claim 19 , wherein the retainer base is separable from the delivery device when the delivery device deploys the one or more subcutaneous anchors from the distal opening.