Device and method for less forceful tissue puncture
Inventors
Bagwell, Roger B. • Clement, Ryan S. • Meehan, Andrew J. • Scruggs, Casey A. • Sheehan, Ryan M. • Mulvihill, Maureen L.
Assignees
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Publication Number
US-10219832-B2
Publication Date
2019-03-05
Expiration Date
Abstract
A device for penetrating tissue is provided that has a driving actuator with a body and motor shaft that is reciprocated. A coupler is attached to the motor shaft, and a key engages the driving actuator and coupler and limits rotational motion of the motor shaft and permits linear motion of the motor shaft. A penetrating member is carried by the coupler, and linear motion of the motor shaft is translated to the penetrating member to linearly reciprocate the penetrating member.
Core Innovation
A device for penetrating tissue includes a driving actuator with a body and a motor shaft, where the motor shaft is reciprocated. A penetrating member is coupled to the motor shaft so that reciprocation of the motor shaft is translated to the penetrating member to reciprocate the penetrating member. A controller in electrical communication with the driving actuator sends signals to reciprocate the motor shaft according to a preselected operating frequency based on a tissue type to be penetrated.
The preselected operating frequency is selected to be sufficient to offset at least a portion of damping of oscillatory displacement amplitude resulting from a resonant frequency shift from air to the tissue type upon insertion. The preselected operating frequency is selected from the group consisting of the resonance frequency of the penetrating member in the tissue type; a frequency higher than a resonant frequency of the penetrating member in air; in the range of 1/3 to 1/2 octave higher than the resonant frequency of the penetrating member in air; and in the range of 95-150 Hz.
In one described configuration, the driving actuator includes a first magnet array and a second magnet array, and a first centering magnet and a second centering magnet that repel one another with the magnet arrays when alternating current is received from a coil. The reciprocation is translated to the motor shaft, and a penetrating member having an inner lumen is removably affixed to the motor shaft and receives reciprocation.
A coupler attached to the motor shaft removably affixes the penetrating member and includes a key that engages the driving actuator, limiting rotational motion while permitting linear motion to the motor shaft. The disclosed device also includes a syringe coupling bracket releasably attaching to an exterior handpiece body, a syringe body with a syringe axis spaced apart from a penetrating axis, and a plunger that dispenses fluid through a side port into the inner lumen of the penetrating member.
Claims Coverage
The independent claims are directed to a tissue-penetrating device that uses a reciprocating motor shaft and penetrating member, with a controller that selects a preselected operating frequency based on tissue type to mitigate damping caused by a resonant frequency shift from air to tissue. The independent claims include six inventive features.
Reciprocating motor shaft translated to penetrating member
A driving actuator has a body and a motor shaft that is reciprocated, and a penetrating member coupled to the motor shaft where reciprocation of the motor shaft is translated to the penetrating member to reciprocate the penetrating member.
Tissue-type-based preselected operating frequency offsetting resonant damping
A controller in electrical communication with the driving actuator sends signals to reciprocate the motor shaft according to a preselected operating frequency based on the tissue type to be penetrated, where the preselected operating frequency offsets at least a portion of damping of oscillatory displacement amplitude resulting from a resonant frequency shift from air to the tissue type upon insertion.
Enumerated preselected operating-frequency selection options
The preselected operating frequency is selected from the group consisting of the resonance frequency of the penetrating member in the tissue type; a frequency higher than a resonant frequency of the penetrating member in air; in the range of 1/3 to 1/2 octave higher than the resonant frequency of the penetrating member in air; and in the range of 95-150 Hz.
Voice-coil magnet-array reciprocating driving actuator with centering magnets
The driving actuator includes a first magnet array and a second magnet array, a first centering magnet proximal to both the first and second magnet arrays with repulsion relative to the first magnet array, a second centering magnet distal to the first centering magnet with repulsion relative to the second magnet array, and a coil configured so alternating current causes the magnet arrays to reciprocate and translate the reciprocation to the motor shaft.
Keyed coupler limiting rotational motion permitting linear translation
A coupler attached to the motor shaft removably affixes the penetrating member to the motor shaft and translates linear motion from the motor shaft to the penetrating member, the coupler having a key integral to and extending outwardly therefrom, the key engaging the driving actuator, limiting rotational motion and permitting linear motion to the motor shaft.
Syringe side-port dispensing into inner lumen
A syringe coupling bracket releasably attaches to an exterior handpiece body, a syringe body releasably attaches to the syringe coupling bracket with a syringe axis spaced apart from a penetrating axis, and a plunger moves relative to the syringe body such that fluid is dispensed through a side port into the inner lumen of the penetrating member.
The claims center on a reciprocated motor shaft translated to a penetrating member and on controller-based selection of a tissue-type-based preselected operating frequency that offsets damping caused by a resonant frequency shift from air to tissue. The claims further cover specific actuator, coupler, and side-port syringe structures tied to the reciprocation and operation on a penetrating member and inner lumen.
Stated Advantages
Offsets at least a portion of damping of oscillatory displacement amplitude resulting from a resonant frequency shift from air to the tissue type upon insertion.
Documented Applications
No documented applications found
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