Needle biopsy forceps with integral sample ejector
First Claim
1. A needle biopsy instrument for retrieving and ejecting a tissue sample taken from an organ, comprising:
- an elongate hollow shaft member with a proximal end and a distal end;
a needle connected at least indirectly to said shaft member proximate the distal end thereof, said needle being oriented to pass through a portion of tissue to be sampled before the tissue sample is severed from the organ;
a tissue ejection element mounted at least indirectly to said shaft member at said distal end thereof; and
an ejection mechanism operatively connected to at least one of said needle and said tissue ejection element for moving said needle and said tissue ejection element relative to one another so that said tissue ejection element engages or contacts the tissue sample and the tissue sample is dislodged from a distal end of said needle.
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Accused Products
Abstract
A needle biopsy instrument for retrieving a tissue sample from an internal organ such as needle biopsy forceps, includes a pushing surface for safely dislodging a tissue sample from the needle after the instrument containing the sample is retrieved from the patient using mechanical control means operated from the proximal handle to thereby avoid the risk of accidental cuts, punctures and other injuries to medical personnel while trying to manually remove the sample. The instrument has a cam mechanism, or other mechanical links scissor links for operating the cups and producing relative movement between the pushing surface and axis of the needle to cause a tissue sample to be moved toward and eventually off of the tip of the needle into a sample receiving cup. An axial reciprocating control member attached to either the needle or the pushing surface produces the relative movement and is manually controlled by a handle or other grip at the proximal end of the forceps. The needle is either retracted axially from the distal toward the proximal end of the device, or a pushing member attached to the distal end of an actuating cable or cable is moved distally along the axis of a stationary needle. A latch mechanism can be provided on the proximal end to release a biasing force to provide the relative movement between the needle and pushing member to slide a tissue sample off the needle.
293 Citations
30 Claims
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1. A needle biopsy instrument for retrieving and ejecting a tissue sample taken from an organ, comprising:
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an elongate hollow shaft member with a proximal end and a distal end;
a needle connected at least indirectly to said shaft member proximate the distal end thereof, said needle being oriented to pass through a portion of tissue to be sampled before the tissue sample is severed from the organ;
a tissue ejection element mounted at least indirectly to said shaft member at said distal end thereof; and
an ejection mechanism operatively connected to at least one of said needle and said tissue ejection element for moving said needle and said tissue ejection element relative to one another so that said tissue ejection element engages or contacts the tissue sample and the tissue sample is dislodged from a distal end of said needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. In a needle biopsy forceps having an elongate hollow shaft member with a proximal end and a distal end, a needle for passing through a portion of tissue to be sampled, a plurality of opposing cups on the distal end of said shaft member for severing and retrieving a tissue sample, at least one first cable slidably disposed within the shaft member and operably attached to said opposing cups, and cup positioning means mounted at the proximal end of said shaft member for sliding the at least one first cable, the improvement comprising:
- a tissue ejection element for advancing a sample of tissue on said needle toward a distal end of said needle, and motion inducing means operatively connected to at least one of said needle and said tissue ejection element for moving said one of said needle and said tissue ejection element relative to the other of said needle and said tissue ejection element, thereby moving said sample of tissue relative to said needle.
- View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for retrieving a tissue sample taken from an organ through the biopsy channel of an endoscope, the method comprising:
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a) providing a needle biopsy instrument comprised of;
a flexible, hollow shaft member with a proximal end and a distal end;
a needle disposed proximate the distal end of the shaft member and oriented to pass through a portion of tissue to be sampled before the tissue sample is severed from the organ;
tissue sample pushing means disposed at a proximal end of said needle for movement proximally to distally relative to said needle;
at least one cable slidably disposed within said hollow shaft member and extending from associated control means at the proximal end of the shaft member to the distal end;
whereby sliding said cable produces relative movement between said needle and said pushing means to thereby dislodge a severed tissue sample from the distal end of the needle;
b) inserting the biopsy instrument through the biopsy channel of the endoscope until a portion of the distal end of the biopsy instrument extends beyond the distal end of the endoscope;
c) positioning the distal end of the biopsy instrument adjacent a portion of tissue to be sampled;
d) moving the distal end of the biopsy instrument to cause the needle to pierce the tissue;
e) severing a portion of the tissue surrounding the needle from the organ;
f) withdrawing the biopsy instrument and tissue sample from the channel of the endoscope; and
g) moving the pushing means relative to the needle to dislodge the sample from the needle.
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Specification