Medical needle for use in ultrasound imaging and method of enhancing the visiblity of such a needle to ultrasound
First Claim
Patent Images
1. A medical needle arrangement for insertion into body tissue, comprising:
- a hollow stylet having a bore therein, a distal ends and an exposed aperture positioned about said distal end and communicating with said bore, said aperture being located and dimensioned to substantially prevent occlusion of said aperture by body tissue, said bore and said aperture being configured for emitting a sub-ultrasonic longitudinal oscillation therefrom; and
a cannula, said stylet being housed within and slidable relative to said cannula.
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Abstract
A needle inserted into body tissue is rendered visible to a Doppler ultrasound imager by generating a longitudinal oscillation of the fluid column in the needle barrel by means of a transducer which is energised by a signal of frequency 100 Hz to 2 kHz, for example. An image of the needle tip is displayed on a screen.
37 Citations
20 Claims
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1. A medical needle arrangement for insertion into body tissue, comprising:
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a hollow stylet having a bore therein, a distal ends and an exposed aperture positioned about said distal end and communicating with said bore, said aperture being located and dimensioned to substantially prevent occlusion of said aperture by body tissue, said bore and said aperture being configured for emitting a sub-ultrasonic longitudinal oscillation therefrom; and a cannula, said stylet being housed within and slidable relative to said cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A medical needle arrangement for insertion into body tissue, comprising:
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a hollow stylet having a bore therein, a distal end, and an exposed aperture positioned about said distal end and communicating with said bore; and a trocar having a recess about a distal end thereof, said stylet being housed within and slidable relative to said trocar, wherein said exposed aperture of said hollow stylet is positioned in said recess of said trocar for emitting a sub-ultrasonic longitudinal oscillation therefrom. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A medical needle arrangement for insertion into body tissue, comprising:
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a tubular stylet having a bore therein, a distal end, and an exposed aperture positioned about said distal end and communicating with said bore; a trocar having a recess about a closed, distal end thereof, said tubular stylet being housed within and slidable relative to said trocar, wherein said exposed aperture of said tubular stylet is positioned in said recess of said trocar for emitting a sub-ultrasonic longitudinal oscillation therefrom; and an outer cutting sheath being slidable over said recess of said trocar.
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Specification