US5213110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pistol-grip vacuum soft tissue biopsy device
Assignee: DU-KEDEM PROJECTS Ltd AN ISRAELI Co
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Filing: 1992-03-16
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Granted: 1993-05-25
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Expires: 2012-03-16
Abstract
Abstract A soft tissue biopsy device provided with a piston retraction mechanism designed as a pistol-grip handle for developing a suction chamber within a housing as the piston slides therein. The suction reaches the cannula tip as it is withdrawn, drawing tissue into a depression on an exposed stylet. When the piston retraction mechanism reaches a preset cam limit point, it automatically releases the piston, which is shot forward and restored to its position in the housing by vacuum-spring action. Thus, the cannula slides quickly over the stylet, cutting the tissue and retaining it in the depression. The entire procedure is performed by a single-handed operation. The inventive biopsy device is designed with a piston and housing which are relatively large in comparison to the cannula diameter. Thus, with initial retraction of the piston, a relatively large suction is developed in the cannula, drawing tissue therein and firmly seating it in the stylet depression.
Inventors
- 👤 Uzi Kedem
- 👤 Mordechai Rubinstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:45
CPC Classifications
A; A61; A61B; A61B10/00; A61B10/02; A61B10/0233; A61B10/0266; A61B10/0275; A61B10/0283; A61B2010/0208
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
208 words
A soft tissue biopsy device comprising: a cylindrical housing having a piston being slidably retractable therein, said piston having a cannula extending distally therefrom and being in communication with said housing, said piston being slidably seated on a stylet fixed at one to said housing, said stylet being slidably engaged along its length in said cannula such that its distal end protrudes therefrom; means for retracting said piston from an initial position within said housing, to withdraw said cannula and expose said stylet distal end, while developing a suction chamber within said housing and along said cannula length; and a cam for limiting retraction of said piston by releasing said piston retraction means, to restore said piston to its initial position within said housing by vacuum-spring action of said suction chamber, such that when the device is inserted into organ tissue to perform a biopsy procedure, retraction of said piston develops said suction chamber in said housing and along said cannula length to draw a portion of said tissue into a depression formed on said stylet distal end, whereupon said cam releases said piston which is shot forward in said housing, and said cannula slides over said stylet to cut and retain said tissue portion in said depression.
Claim 2
Dependent Claim
208 words
A soft tissue biopsy device comprising: a cylindrical housing having a piston being slidably retractable therein, said piston having a cannula extending distally therefrom and being in communication with said housing, said piston being slidably seated on a stylet fixed at one to said housing, said stylet being slidably engaged along its length in said cannula such that its distal end protrudes therefrom; means for retracting said piston from an initial position within said housing, to withdraw said cannula and expose said stylet distal end, while developing a suction chamber within said housing and along said cannula length; and a cam for limiting retraction of said piston by releasing said piston retraction means, to restore said piston to its initial position within said housing by vacuum-spring action of said suction chamber, such that when the device is inserted into organ tissue to perform a biopsy procedure, retraction of said piston develops said suction chamber in said housing and along said cannula length to draw a portion of said tissue into a depression formed on said stylet distal end, whereupon said cam releases said piston which is shot forward in said housing, and said cannula slides over said stylet to cut and retain said tissue portion in said depression.
Claim 3
Dependent Claim
65 words
The biospy device of claim 1 wherein said cylindrical housing is seated within a pistol-grip housing and said retraction means comprises a fork arranged for sliding motion within said pistol-grip housing by squeezing a handle extending therefrom, said fork engaging said piston and retracting it, a lever extending from said fork contacting said cam, causing it to rotate and release said fork and piston engagement.
Claim 4
Dependent Claim
20 words
The biopsy device of claim 2 wherein said cam is adjustable to release said fork and piston engagement as desired.
Claim 5
Dependent Claim
25 words
The biopsy device of claim 2 wherein said cylindrical housing, piston, cannula and stylet are provided as a replaceable unit, which engages said pistol-grip housing.
Claim 6
Dependent Claim
17 words
The biopsy device of claim 2 wherein said pistol-grip handle is designed for single-handed retraction means operation.
Claim 7
Dependent Claim
18 words
The biopsy device of claim 2 wherein said pistol-grip handle enables control of fluid sampling in aspiration procedures.
Claim 8
Dependent Claim
21 words
The biopsy device of claim 1 wherein the suction volume in said suction chamber is predetermined by adjustment of said cam.
Claim 9
Dependent Claim
19 words
The biopsy device of claim 1 wherein said vacuum-spring action provides constant force as said piston is shot forward.
Claim 10
Dependent Claim
39 words
The biopsy device of claim 1 wherein said cylindrical housing has a volume significantly greater than that of said cannula, to develop a high suction level in said cannula length with initial piston retraction and securely retain organ tissue.
Claim 11
Dependent Claim
15 words
The biopsy device of claim 1 wherein said vacuum-spring action insures quick cutting of tissue.
Claim 12
Dependent Claim
36 words
The biopsy device of claim 1 wherein said cannula tip has an upper edge formed with an acute angle smaller than that of said stylet tip, to insure efficient cutting of an increased quantity of tissue.
Claim 13
Independent Claim
208 words
A method of performing soft tissue biopsy comprising the steps of: providing a cylindrical housing having a piston being slidably retractable therein, said piston having a cannula extending distally therefrom and being in communication with said housing, said piston being slidably seated on a stylet fixed at one end to said housing, said stylet being slidably engaged along its length in said cannula such that its distal end protrudes therefrom; retracting said piston from an initial position within said housing, to withdraw said cannula and expose said stylet distal end, while developing a suction chamber within said housing and along said cannula length; and limiting retraction of said piston by release thereof, to restore its initial position within said housing by vacuum-spring action of said suction chamber, such that when the device is inserted into organ tissue to perform a biopsy procedure, retraction of said piston develops said suction chamber in said housing and along said cannula length to draw a portion of said tissue into a depression formed on said stylet distal end, whereupon limitation of said piston retraction causes it to be released and shot forward in said housing, and said cannula slides over said stylet to cut and retain said tissue portion in said depression.
Claim 14
Independent Claim
208 words
A method of performing soft tissue biopsy comprising the steps of: providing a cylindrical housing having a piston being slidably retractable therein, said piston having a cannula extending distally therefrom and being in communication with said housing, said piston being slidably seated on a stylet fixed at one end to said housing, said stylet being slidably engaged along its length in said cannula such that its distal end protrudes therefrom; retracting said piston from an initial position within said housing, to withdraw said cannula and expose said stylet distal end, while developing a suction chamber within said housing and along said cannula length; and limiting retraction of said piston by release thereof, to restore its initial position within said housing by vacuum-spring action of said suction chamber, such that when the device is inserted into organ tissue to perform a biopsy procedure, retraction of said piston develops said suction chamber in said housing and along said cannula length to draw a portion of said tissue into a depression formed on said stylet distal end, whereupon limitation of said piston retraction causes it to be released and shot forward in said housing, and said cannula slides over said stylet to cut and retain said tissue portion in said depression.
Claim 15
Dependent Claim
59 words
The method of claim 12 wherein said cylindrical housing is seated within a pistol-grip housing and said piston is retracted by a fork arranged for sliding motion within said pistol-grip housing by squeezing a handle extending therefrom, said fork engaging said piston, a lever extending from said fork limiting said piston retraction by releasing said engaged fork and piston.
Claim 16
Dependent Claim
16 words
The method of claim 13 wherein said handle enables control of fluid sampling in aspiration procedures.
Claim 17
Dependent Claim
13 words
The method of claim 13 wherein said handle enables single-handed piston retraction operation.
Claim 18
Dependent Claim
15 words
The method of claim 12 wherein said piston retraction limitation is predetermined in adjustable fashion.
Claim 19
Dependent Claim
18 words
The method of claim 12 wherein the suction volume of said housing suction is predetermined in adjustable fashion.
Claim 20
Dependent Claim
38 words
The method of claim 12 wherein said cylindrical housing has a volume significantly greater than that of said cannula, to develop a high suction level in said cannula length with initial piston retraction, and securely retain organ tissue.
Claim 21
Dependent Claim
14 words
The method of claim 12 wherein said vacuum-spring action insures quick cutting of tissue.
Claim 22
Dependent Claim
18 words
The method of claim 12 wherein said vacuum-spring action provides constant force as said piston is shot forward.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |