Tissue anchoring articles
Self-righting articles, such as self-righting capsules for administration to a subject, are generally provided. In some embodiments, the self-righting article may be configured such that the article may orient itself relative to a surface (e.g., a surface of a tissue of a subject). The self-righting articles described herein may comprise one or more tissue engaging surfaces configured to engage (e.g., interface with, inject into, anchor) with a surface (e.g., a surface of a tissue of a subject). In some embodiments, the self-righting article may have a particular shape and/or distribution of density (or mass) which, for example, enables the self-righting behavior of the article. In some embodiments, the self-righting article may comprise a tissue interfacing component and/or a pharmaceutical agent (e.g., for delivery of the active pharmaceutical agent to a location internal of the subject). In some cases, upon contact of the tissue with the tissue engaging surface of the article, the self-righting article may be configured to release one or more tissue interfacing components. In some cases, the tissue interfacing component is associated with a self-actuating component. For example, the self-righting article may comprise a self-actuating component configured, upon exposure to a fluid, to release the tissue interfacing component from the self-righting article. In some cases, the tissue interfacing component may comprise and/or be associated with the pharmaceutical agent (e.g., for delivery to a location internal to a subject).
1 . A self-righting article configured to anchor at a location internal to a subject, comprising:
at least one anchoring mechanism associated with the self-righting article; and
an outer shell,
wherein the self-righting article is a monostatic body due to:
a) the outer shell comprising a first material and a second material, the second material having a different density than the first material, such that a center of mass of the self-righting article is offset from a geometric center of the self-righting article, and/or
b) the shape of the outer shell of the self-righting article,
such that the self-righting article has a single stable resting position when placed on a flat surface in any orientation,
wherein the self-righting article comprises at least a first portion having an average density greater than 1 g/cm 3 , the article configured to be retained at the location under greater than or equal to 0.6N of force and/or a change in orientation of greater than or equal to 30 degrees.
2 . A self-righting article as in claim 1 , further comprising:
a spring at least partially encapsulated by the outer shell, the spring maintained in an at least partially compressed state by a support material under at least 5% compressive strain, wherein the at least one anchoring mechanism is operably linked to the spring.
3 . A self-righting article as in claim 1 , wherein each anchoring mechanism comprises a hook.
4 . A self-righting article as in claim 3 , wherein the hooks comprise a non-degradable material under physiological conditions.
5 . A self-righting article as in claim 1 , wherein each anchoring mechanism is a hooked needle.
6 . A self-righting article as in claim 1 , wherein each anchoring mechanism is configured to penetrate a tissue at the location internal to the subject at a depth of greater than or equal to 1 mm and less than or equal to 3 mm.
7 . A self-righting article as in claim 1 , wherein the anchoring mechanism has a length of greater than or equal to 10 microns and less than or equal to 250 microns.
8 . A self-righting article as in claim 1 , wherein each anchoring mechanism has a hooking force of greater than or equal to 0.002N and less than or equal to 1N.
9 . A self-righting article as in claim 1 , wherein the article is configured to be retained at the location under greater than or equal to 0.6N of transversely applied force.
10 . A self-righting article as in claim 1 , wherein the article is configured to be retained at the location after a change in orientation of greater than or equal to 30 degrees.
11 . A self-righting article configured to anchor at a location internal to a subject, comprising:
at least one anchoring mechanism associated with the self-righting article,
wherein the self-righting article is a monostatic body due to a center of mass of the self-righting article and/or the shape of the self-righting article, such that the self-righting article has a single stable resting position when placed on a flat surface in any orientation,
wherein the self-righting article comprises at least a first portion having an average density greater than 1 g/cm 3 , the article configured to be retained at the location under greater than or equal to 0.6N of force and/or a change in orientation of greater than or equal to 30 degrees.
12 . A self-righting article as in claim 11 , further comprising:
an outer shell; and
a spring at least partially encapsulated by the outer shell, the spring maintained in an at least partially compressed state by a support material under at least 5% compressive strain, wherein the at least one anchoring mechanism is operably linked to the spring.
13 . A self-righting article as in claim 11 , wherein each anchoring mechanism comprises a hook.
14 . A self-righting article as in claim 13 , wherein the hooks comprise a non-degradable material under physiological conditions.
15 . A self-righting article as in claim 11 , wherein each anchoring mechanism is a hooked needle.
16 . A self-righting article as in claim 11 , wherein each anchoring mechanism is configured to penetrate a tissue at the location internal to the subject at a depth of greater than or equal to 1 mm and less than or equal to 3 mm.
17 . A self-righting article as in claim 11 , wherein the anchoring mechanism has a length of greater than or equal to 10 microns and less than or equal to 250 microns.
18 . A self-righting article as in claim 11 , wherein each anchoring mechanism has a hooking force of greater than or equal to 0.002N and less than or equal to 1N.
19 . A self-righting article as in claim 11 , wherein the article is configured to be retained at the location under greater than or equal to 0.6N of transversely applied force.
20 . A self-righting article as in claim 11 , wherein the article is configured to be retained at the location after a change in orientation of greater than or equal to 30 degrees.