Patch injector with slidable joint
An injector including at least one fluid reservoir having a needle, a surface attached to skin and coupled to the fluid reservoir by at least a first joint and a second joint at least a portion of one of the joints being slidable or having interlocking arms. At least a portion of a path of translation of a slidable portion of the first joint and a portion of a path of translation of the second joint are angled in respect to each another.
1. A method of injection, comprising:
rotating a needle connected to a fluid reservoir relative to a surface configured for attachment to skin about a first joint;
concurrently moving the needle along a translational degree of freedom of each of the first joint and a second joint; and
inserting at least a portion of the needle across a surface of skin;
wherein the concurrently rotating and translating the needle converts a curvilinear travel path of the needle into at least a portion of the needle crossing the surface within less than 5 degrees deviated from a straight line.
2. The method according to claim 1 , wherein inserting at least a portion of the needle across the surface of skin is angled at less than 3 degrees from the straight line.
3. The method according to claim 1 , wherein inserting at least a portion of the needle across the surface of skin is angled at less than 1 degree from the straight line.
4. The method according to claim 2 , wherein the translational degree of freedom of one of the first and second joints is axial with respect to the surface of skin.
5. The method according to claim 4 , wherein the movement in the translational degree of freedom of one of the first and second joints is in a back and forth direction.
6. The method according to claim 2 , wherein the concurrently rotating and moving the needle comprises adjusting a path of travel and/or angle of tilt of the needle entering the skin.
7. The method according to claim 6 , further comprising forming an entry hole in the surface of skin with a diameter (Φ) being at least twice the diameter (Φ′) of the needle.
8. The method according to claim 1 , wherein at least a portion of the needle is resilient.
9. The method according to claim 1 , wherein at least a portion of the needle is curved.
10. A method of injection, comprising:
rotating a needle connected to a fluid reservoir relative to a surface configured for attachment to skin about a first joint;
concurrently moving the needle along a translational degree of freedom of each of the first joint and a second joint; and
inserting at least a portion of the needle across a surface of skin;
forming an entry hole in the surface of skin with a diameter (Φ) being at least 1.5 times the diameter (Φ′) of the needle.
11. The method according to claim 10 , wherein inserting at least a portion of the needle across the surface of skin is angled at less than 5 degrees from the straight line.
12. The method according to claim 10 , wherein inserting at least a portion of the needle across the surface of skin is angled at less than 3 degrees from the straight line.
13. The method according to claim 10 , wherein the translational degree of freedom of one of the first and second joints is axial with respect to the surface of skin.
14. The method according to claim 13 , wherein the movement in the translational degree of freedom of one of the first and second joints is in a back and forth direction.
15. The method according to claim 13 , wherein the concurrently rotating and moving the needle comprises adjusting a path of travel and/or angle of tilt of the needle entering the surface of skin.
16. The method according to claim 15 , wherein the formed entry hole in the skin has a diameter (Φ) being at least twice the diameter (Φ′) of the needle.
17. The method according to claim 10 , wherein at least a portion of the needle is resilient.
18. The method according to claim 10 , wherein at least a portion of the needle is curved.