TWIN-TYPE CANNULA ASSEMBLIES FOR HAND-HELD POWER-ASSISTED TISSUE ASPIRATION INSTRUMENTS
First Claim
1. A tissue aspiration instrumentation system comprising:
- a hand-supportable tissue aspiration instrument includinga hand-supportable housing havinga front portion and a rear portion aligned along a longitudinal axis,an interior volume; and
a cannula drive mechanism disposed within said interior volume; and
a twin cannula assembly havinga hollow inner cannula with an open-end type opening and having an hollow inner cannula base portion; and
wherein said hollow outer cannula has multiple outer aspiration apertures formed about the distal portion of said hollow outer cannula, and an outer cannula base portion stationarily connected to the front portion of said hand-supportable housing; and
wherein said cannula drive mechanism causes (i) said hollow inner cannula base portion to reciprocate within said interior volume, (ii) said hollow inner cannula to reciprocate within said hollow outer cannula, and (iii) said open-end ending to reciprocate along said distal portion of said hollow outer cannula, while tissue is being aspirated through said multiple outer aspiration apertures and through said reciprocating open-end type aspiration opening, and along a fluid communication channel extending from said open-end type aspiration opening, along said hollow inner cannula and said hollow inner cannula base portion through and through a section of flexible tubing connected to said vacuum source.
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Accused Products
Abstract
A power-assisted tissue-aspiration instrument employing a new and improved twin-cannula assembly. The twin-cannula assembly includes: an outer cannula mounted stationary to the front portion of a hand-supportable housing containing an inner cannula reciprocation mechanism, and an inner cannula having an open-end type aspiration aperture. The outer cannula has three groups of outer aspiration apertures about its distal portion. The open-end type aspiration opening of the inner cannula reciprocates back and forth to a mid position between the first group of aspiration apertures, and the third group of outer aspiration apertures, so that vacuum pressure is always delivered to at least 1/2 of one the outer aspiration aperture groups as the inner cannula is reciprocated back and forward within the outer cannula.
65 Citations
14 Claims
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1. A tissue aspiration instrumentation system comprising:
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a hand-supportable tissue aspiration instrument including a hand-supportable housing having a front portion and a rear portion aligned along a longitudinal axis, an interior volume; and a cannula drive mechanism disposed within said interior volume; and a twin cannula assembly having a hollow inner cannula with an open-end type opening and having an hollow inner cannula base portion; and wherein said hollow outer cannula has multiple outer aspiration apertures formed about the distal portion of said hollow outer cannula, and an outer cannula base portion stationarily connected to the front portion of said hand-supportable housing; and wherein said cannula drive mechanism causes (i) said hollow inner cannula base portion to reciprocate within said interior volume, (ii) said hollow inner cannula to reciprocate within said hollow outer cannula, and (iii) said open-end ending to reciprocate along said distal portion of said hollow outer cannula, while tissue is being aspirated through said multiple outer aspiration apertures and through said reciprocating open-end type aspiration opening, and along a fluid communication channel extending from said open-end type aspiration opening, along said hollow inner cannula and said hollow inner cannula base portion through and through a section of flexible tubing connected to said vacuum source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A twin cannula assembly for use with a tissue aspiration instrumentation system including a hand-supportable tissue aspiration instrument including a hand-supportable housing having a front portion and a rear portion aligned along a longitudinal axis, an interior volume, and a cannula drive mechanism disposed within said interior volume, wherein said twin cannula assembly comprises:
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a hollow inner cannula with an open-end type aspiration opening, and having an hollow inner cannula base portion; and wherein said hollow outer cannula has multiple elongated outer aspiration apertures about its distal portion, and an outer cannula base portion stationarily connected to the front portion of said hand-supportable housing. - View Dependent Claims (11, 12)
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13. A power-assisted tissue-aspiration instrumentation system comprising:
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a hand-supportable housing having a front portion and a rear portion aligned along a longitudinal axis, an interior volume; and a cannula drive mechanism disposed within said interior volume; and a twin cannula assembly having a hollow inner cannula with an open-end type aspiration opening and having an hollow inner cannula base portion; wherein said hollow inner cannula is disposed in said disposed within said hollow outer cannula; and wherein said hollow outer cannula has multiple outer aspiration apertures formed about the distal portion of said hollow outer cannula, and an outer cannula base portion stationarily connected to the front portion of said hand-supportable housing; wherein said multiple outer aspiration apertures comprise first, second and third groups of outer aspiration apertures formed about the distal portion of said hollow outer cannula; wherein said first group of outer aspiration apertures is formed closest to the distal end of said hollow outer cannula, said second group of outer aspiration apertures is formed closest to the proximal end of said hollow outer cannula, and said second group of outer aspiration apertures is formed said first and third outer aspiration apertures; and wherein during system operation, said cannula drive mechanism causes (i) said hollow inner cannula base portion to reciprocate within said interior volume, (ii) said hollow inner cannula to reciprocate within said hollow outer cannula, and (iii) said open-end type aspiration opening to reciprocate back and forth to a mid position between said first group of aspiration apertures and said third group of outer aspiration apertures, so that vacuum pressure is always delivered to at least ½
of one said outer aspiration aperture groups as said hollow inner cannula is reciprocated back and forward within said hollow outer cannula, cutting off fat being aspirated into said hollow inner cannula lumen, and thereby progressively delivering more suction performance and achieving a scissoring-effect during tissue aspiration operations.
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14. (canceled)
Specification