Instrumentation for injection of therapeutic fluid into joints
First Claim
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1. A needle for injecting therapeutic fluid into a target space, the needle comprising:
- one or more elongated tissue-penetrating members for penetrating into a target space;
at least one extraction orifice located on said one or more tissue-penetrating members;
an extraction fluid path in fluid communication with said at least one extraction orifice;
at least one injection orifice located on said one or more tissue-penetrating members and positioned remotely from said at least one extraction orifice;
an injection fluid path in fluid communication with said at least one injection orifice;
wherein the number of extraction and injection orifices, their size, and their position relative to each other are selected to create a pressure gradient within the target space when a therapeutic fluid is injected through the at least one injection orifice;
a manifold having a manifold cavity wherein said one or more elongated tissue-penetrating members are attached to said manifold, said manifold cavity further comprising an internal wall configured to form a chamber within that is not in fluid communication with said manifold cavity, anda connector having a connector opening in fluid communication with said chamber and configured to allow delivery of a medical agent into said chamber without coming in fluid communication with said manifold cavity.
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Abstract
Described are novel medical delivery devices that can be used to effectively distribute a medical agent to multiple sites within a tissue volume without requiring the device to be repositioned, including for example to distribute the medical agent within the nucleus pulposus tissue of a spinal disc. Also described are medical delivery devices configured to simultaneously remove fluid from the tissue volume into which a medical agent is being delivered, thus avoiding or otherwise decreasing any pressure build-up and facilitating an effective, uniform delivery of the therapeutic agent.
56 Citations
19 Claims
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1. A needle for injecting therapeutic fluid into a target space, the needle comprising:
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one or more elongated tissue-penetrating members for penetrating into a target space; at least one extraction orifice located on said one or more tissue-penetrating members; an extraction fluid path in fluid communication with said at least one extraction orifice; at least one injection orifice located on said one or more tissue-penetrating members and positioned remotely from said at least one extraction orifice; an injection fluid path in fluid communication with said at least one injection orifice; wherein the number of extraction and injection orifices, their size, and their position relative to each other are selected to create a pressure gradient within the target space when a therapeutic fluid is injected through the at least one injection orifice; a manifold having a manifold cavity wherein said one or more elongated tissue-penetrating members are attached to said manifold, said manifold cavity further comprising an internal wall configured to form a chamber within that is not in fluid communication with said manifold cavity, and a connector having a connector opening in fluid communication with said chamber and configured to allow delivery of a medical agent into said chamber without coming in fluid communication with said manifold cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification