Devices, systems and related methods for delivery of fluid to tissue
View Patent ↗Described are devices useful to inject fluid to tissue without the use of a needle, and related methods; the devices include one or a combination of features such as ejection orifices ( 40 ), distal end control features, or combinations of these; the systems can include a fluid delivery system having an injector source and an access device; the access device can comprise a minimally invasive, tubular delivery lumen ( 34 ) such as a catheter or endoscope; the tube-like device further includes one or more apposing jets that are selectively fired to force the injection orifice of the tube-like device against the target tissue; selective firing can include a continuous firing during the injection to improve the efficiency of the treatment.
1. A method of injecting tissue comprising
providing a needleless injection device comprising
a flexible shaft comprising a proximal end, a distal end, a distal end tip, and an injection lumen extending from the proximal end to the distal end,
the distal end comprising an injection orifice at a length-wise location of the distal end on a proximal side of the distal end tip, the injection orifice in communication with the injection lumen, the injection orifice directed at an angle in the range from 45 to about 100 degrees relative to a longitudinal axis of the shaft at the length-wise location of the injection orifice,
wherein the shaft is capable of ejecting a fluid stream from the injection orifice, the fluid stream being capable of being injected into tissue by penetrating a tissue surface as a fluid stream at a non-normal angle relative to the tissue surface, and
an elongate tissue holding tip extending longitudinally from the distal end tip, the elongate tissue holding tip being capable of frictionally engaging tissue to prevent movement of the injection orifice during injection,
providing injectate at the proximal end and in communication with the injection lumen,
placing the injection orifice near a tissue surface without penetrating the tissue surface,
pressurizing the injectate to cause the injectate to be ejected from the injection orifice as a fluid stream that passes through the tissue surface and disperses as fluid particles in tissue below the tissue surface.
2. A method according to claim 1 wherein the shaft comprises a sidewall extending from the proximal end to the distal end and the injection orifice comprises an aperture passing through the sidewall.
3. A method according to claim 1 wherein
fluid ejected from the injection orifice produces an injection force on the distal end, and
the tissue holding tip comprises a pointed elongate extension capable of frictionally engaging tissue to prevent movement of the injection orifice during injection.
4. A method according to claim 3 wherein
fluid ejected from the injection orifice produces an injection force on the distal end, and
the distal end comprises a control orifice from which fluid can be ejected to produce a control force to oppose the injection force.
5. A method according to claim 3 , wherein
the device comprises a working shaft comprising a working shaft proximal end, a working shaft distal end, and a working lumen extending between the working shaft proximal end and the working shaft distal end, and
the flexible shaft is contained in the working lumen in a manner that allows the flexible shaft to move longitudinally within the working lumen.
6. A method according to claim 5 wherein the working shaft comprises
a steerable distal end,
an end opening from which the flexible shaft distal end can be extended,
fiber optics, and
a light source.
7. A method according to claim 1 wherein the elongate tissue holding tip comprises an elongate shaft and a distal end pointed cone.
8. A method according to claim 1 wherein the elongate tissue holding tip has a longitudinal axis that is shared with or parallel to a longitudinal axis of the shaft.
9. A needleless method of injecting tissue, the method comprising
providing a needleless injection device comprising
a flexible shaft comprising a proximal end, a distal end, a distal end tip, and an injection lumen extending from the proximal end to the distal end,
an elongate tissue holding tip extending longitudinally from the distal end tip, the elongate tissue holding tip being capable of frictionally engaging tissue to resist movement of the injection orifice during injection,
the distal end comprising an injection orifice at a length-wise location of the distal end on a proximal side of the distal end tip, the injection orifice in communication with the injection lumen, the injection orifice directed at an angle in the range from about 45 to about 100 degrees relative to a longitudinal axis of the shaft at the length-wise location of the injection orifice,
positioning the distal end at a location to contact a tissue surface and normal to the tissue surface, with the elongate tissue holding tip depressing the tissue, and without the injection orifice penetrating the tissue surface,
ejecting a fluid stream from the injection orifice such that the fluid stream penetrates the tissue surface at a non-normal angle relative to the tissue surface.
10. A method according to claim 9 comprising positioning the distal end tissue surface and normal to the tissue surface without the elongate tissue holding tip puncturing the tissue surface, and placing a normal pressure on the distal end to cause the distal end tip to indent the tissue surface.
11. A method according to claim 9 wherein ejection of fluid from the injection orifice produces an injection force on the distal end.
12. A method according to claim 11 comprising at least partially opposing the injection force.
13. A method according to claim 12 wherein the injection force is opposed by the tissue holding tip and one or more of: an opposing force produced by a control orifice, or an opposing force produced by an injection orifice.
14. A method according claim 9 comprising injecting bladder tissue.