Biopsy needle instrument
First Claim
1. A biopsy needle instrument comprising:
- a housing,extending from said housing, an axially elongated stylet having a distal end and a proximal end and defining a specimen-defining formation adjacent said distal end and a cannula coaxially disposed about said stylet, said cannula having a distal end and a proximal end,said stylet mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position,said cannula mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position,means for biasing said stylet distally toward said second, extended position,means for biasing said cannula distally toward said second, extended position,first finger-displaceable means for retracting said stylet from said second, extended position to said first, retracted position,separate and discrete second finger-displaceable means for retracting said cannula from said second extended position to said first retracted position,said instrument constructed to enable release of said stylet to allow said stylet to move from said first, retracted position to said second, extended position and thereafter release of said cannula to allow said cannula to move from said first, retracted position to said second, extended position,said first and second finger-displaceable means being located on a side of said housing in position to be directly, selectively engaged and displaced by a finger of a single hand while said hand holds the instrument.
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Accused Products
Abstract
One-handed operable biopsy needle instruments, employing combined spring driven stylets, and cannulas, capable of taking multiple specimens while the other hand is free, e.g. to manipulate an ultrasound probe are described. The particular biopsy needle instrument shown in detail has a pair of cannula and stylet compression springs, a pair of members directly engaged on the ends of the springs mounting respectively the cannula and stylet, and releasable holding means for holding the springs compressed until firing. The device that loads the stylet spring and a pivotal latch each can serve as a means for releasably holding the stylet spring. A latch is employed to releasably hold the cannula spring. Actuation of the stylet can cause sequential operation of the cannula through impact of the stylet-mounting member on the cannula latch. Finger-displaceable means provided on a side surface of the housing for selective loading of the springs, and provision of finger-displaceable lock and firing button, all operable by a hand while that hand holds the device, enables single-handed loading and taking of the biopsy specimen(s). The embodiment shown employs a pair of longitudinally arranged, recessed thumb-actuated slide switches on a broad side of a rectangular cross-section housing, and lock and firing button on top, in pre-arranged relationship to the bevel of the stylet tip.
341 Citations
23 Claims
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1. A biopsy needle instrument comprising:
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a housing, extending from said housing, an axially elongated stylet having a distal end and a proximal end and defining a specimen-defining formation adjacent said distal end and a cannula coaxially disposed about said stylet, said cannula having a distal end and a proximal end, said stylet mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position, said cannula mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position, means for biasing said stylet distally toward said second, extended position, means for biasing said cannula distally toward said second, extended position, first finger-displaceable means for retracting said stylet from said second, extended position to said first, retracted position, separate and discrete second finger-displaceable means for retracting said cannula from said second extended position to said first retracted position, said instrument constructed to enable release of said stylet to allow said stylet to move from said first, retracted position to said second, extended position and thereafter release of said cannula to allow said cannula to move from said first, retracted position to said second, extended position, said first and second finger-displaceable means being located on a side of said housing in position to be directly, selectively engaged and displaced by a finger of a single hand while said hand holds the instrument. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A biopsy needle instrument comprising:
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a housing of rectangular transverse cross-section, extending from said housing, an axially elongated stylet having a distal end and a proximal end and defining a specimen-defining formation adjacent said distal end and a cannula coaxially disposed about said stylet, said cannula having a distal end and a proximal end, said stylet mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position, said cannula mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position, stylet retaining means at the proximal end of said stylet and disposed in said housing, wherein said stylet retaining means comprises a collar attached to said stylet, cannula retaining means at the proximal end of said cannula and disposed in said housing, wherein said cannula retaining means comprises a collar attached to said cannula, means for biasing said stylet distally toward said second, extended position, wherein said bias means for said stylet comprises a compression spring, means for biasing said cannula distally toward said second, extended position, wherein said bias means for said cannula comprises a compression spring, said stylet retaining means and said cannula retaining means bearing on ends of said respective compression springs, stylet latch means for retaining said stylet in said first, retracted position, cannula latch means for retaining said cannula in said first retracted position, means on a relatively broad side of said rectangular cross-section housing for retracting said stylet from said second, extended position to said first, retracted position for engagement of said stylet latch means to retain said stylet in retracted position against the means for biasing the stylet distally, wherein said means for retracting said stylet comprises a first slide switch slidably mounted upon and extending through said housing and attached to said stylet retaining means, such that when said first slide switch is moved rearwardly, said stylet retracts from said second extended position to said first retracted position, separate and discrete means on the same relatively broad side of said rectangular cross-section housing for retracting said cannula from said second, extended position to said first, retracted position for engagement of said cannula latch means to retain said cannula in retracted position against the means for biasing the cannula distally, wherein said separate and discrete means for retracting said cannula comprises a second slide switch slidably mounted upon and extending through said housing and attached to said cannula retaining means, such that when said second slide switch is moved rearwardly, said cannula retracts from said second extended position to said first retracted position and means for releasing said stylet latch means to allow said stylet to move from said first, retracted position to said second, extended position and thereafter releasing said cannula latch means to allow said cannula to move from said first, retracted position to said second, extended position. - View Dependent Claims (15, 16, 17)
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18. A biopsy needle instrument comprising:
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a housing, extending from said housing, an axially elongated stylet having a distal end and a proximal end and defining a specimen-defining formation adjacent said distal end and a cannula coaxially disposed about said stylet, and said cannula having a distal end and a proximal end, said stylet mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position, said cannula mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position, means for biasing said stylet distally toward said second, extended position, means for biasing said cannula distally toward said second, extended position, finger displaceable slide means operable for selective independent retracting of said stylet and said cannula from their respective second, extended positions to their respective first, retracted positions, said finger displaceable slide means being located on a side of said housing in position to be directly, selectively engaged and slidably displaced by a finger of a single hand while said hand holds said instrument, said instrument constructed to enable release of said stylet to allow said stylet to move from said first, retracted position to said second, extended position and thereafter release of said cannula to allow said cannula to move from said first, retracted position to said second, extended position, said finger-displaceable slide means being located on a side of said housing in position to be directly, selectively engaged and slidably displaced by a finger of a single hand while said hand holds the instrument.
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19. A method of taking a tissue sample comprising the steps of:
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providing a biopsy needle instrument comprising a housing, extending from said housing an axially elongated stylet having a distal end and a proximal end and defining a specimen-defining formation adjacent said distal end and a cannula coaxially disposed about said stylet, said cannula having a distal end and a proximal end, said stylet mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position, said cannula mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position, means for biasing said stylet distally toward said second, extended position, means for biasing said cannula distally toward said second, extended position, finger-displaceable means operable for selective independent retracting of said stylet from said second, extended position to said first, retracted position and of said cannula from said second, extended position to said first, retracted position, said instrument constructed to enable release of said stylet to allow said stylet to move from said first, retracted position to said second, extended position and thereafter release of said cannula to allow said cannula to move from said first, retracted position to said second, extended position, said finger-displaceable means being located on a side of said housing in position to be directly selectively engaged and displaced by a finger of a single hand while that hand holds the instrument, while holding said instrument with a single hand; retracting said stylet from a second, extended position to a first, retracted position with a finger of said single hand, retracting said cannula from a second, extended position to a first, retracted position with a finger of said single hand, positioning said stylet so as to allow said stylet to project into the tissue to be sampled, releasing said stylet with a finger of said single hand to allow said stylet to move from said first, retracted position to said second, extended position and said cannula to move from said first, retracted position to said second, extended position, thereby severing a sample of tissue; and withdrawing said stylet and cannula together from the tissue. - View Dependent Claims (20, 21)
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- 22. A method of examination by a physician comprising the physician grasping with one hand an ultrasound probe and conducting an ultrasound examination of a patient, grasping with the other hand a biopsy needle instrument comprising telescoped stylet and cannula, each associated with a spring drive means, means to compress the spring drive means, means to hold the spring drive means in compressed condition and means to actuate the spring drive means to fire the telescoped stylet and cannula in sequence, the instrument being constructed for single handed operation, and, the physician, with the single hand, compressively loading the spring drive means, positioning the instrument to take a specimen, firing said instrument to take a specimen, removing the instrument from the patient and, still with said single hand, compressively loading the cannula spring to expose the specimen for deposit.
Specification