US3789852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable trochar, especially for medical purposes
Assignee: Individual
•
Filing: 1972-06-12
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Granted: 1974-02-05
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Expires: 1992-06-12
Abstract
Abstract An expandable tubular element, especially for use as a trochar, in which one or more thin metal strips, such as stainless steel, are arranged to form a tubular element with the tubular element being radially expandable and contractible.
Inventors
- 👤 S Kim
- 👤 A Dusseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:19
CPC Classifications
A; A61; A61M; A61M29/00; A61M29/02; A61B; A61B17/00; A61B17/34; A61B17/3417; A61B17/3421; A61B17/3439; A61B17/04; A61B17/06; A61B17/06066; A61B2017/06085; A61M25/00; A61M25/0021; A61M25/0023; A61M2025/0024
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
114 words
A trochar comprising an elongated tubular portion open at both ends having slidable received therein a removable piercing instrument having a body piercing point protruding from one end of said tubular portion, said tubular portion being formed of at least two thin expandable sheet elements concave toward the axis of said tubular portion and having the circumferential terminal regions in overlapping relation to define said tubular portion, and adjustable means disposed at the other end of the tubular portion including means connected to said concave elements for radially expanding and retracting the sheet elements to increase or decrease the diameter of the tubular portion substantially throughout the longitudinal length of the elongated tubular portion.
Claim 2
Dependent Claim
114 words
A trochar comprising an elongated tubular portion open at both ends having slidable received therein a removable piercing instrument having a body piercing point protruding from one end of said tubular portion, said tubular portion being formed of at least two thin expandable sheet elements concave toward the axis of said tubular portion and having the circumferential terminal regions in overlapping relation to define said tubular portion, and adjustable means disposed at the other end of the tubular portion including means connected to said concave elements for radially expanding and retracting the sheet elements to increase or decrease the diameter of the tubular portion substantially throughout the longitudinal length of the elongated tubular portion.
Claim 3
Dependent Claim
26 words
A trochar according to claim 1 wherein the piercing instrument is provided with a curved blunt tip portion protruding from one end of the tubular portion.
Claim 4
Dependent Claim
41 words
A trochar according to claim 1 in which one end of said tubular portion is adapted for insertion into the body, and a guide ring at the other end of said tubular portion supporting said sheet means and said adjustable means.
Claim 5
Dependent Claim
43 words
A trochar according to claim 3 in which said adjustable means includes at least one finger piece connected to said sheet elements and projecting radially outwardly therefrom, and circumferential slot elements formed in said guide ring and moveably receiving said finger piece means.
Claim 6
Dependent Claim
106 words
A trochar according to claim 3 in which said sheet means comprises at least two elements each of which is in the form of a sheet of metal doubled bAck on itself so as to have one end closed and the other open, each element having a smaller radial thickness extending from the closed end about half the circumferential length of the element and the remainder of the circumferential length of the element having a larger radial thickness, each element being concave toward the axis of the trochar and the closed end of each element telescopically engaging the open end of the element next adjacent thereto.
Claim 7
Dependent Claim
50 words
A trochar according to claim 5 in which stop tabs are provided on the opposite ends of said elements which interengage with the stop tabs at the next adjacent element in the position of minimum telescopic engagement of said elements to prevent said elements from becoming disengaged from each other.
Claim 8
Dependent Claim
87 words
A trochar according to claim 5 which includes a post fixed to the radially outer side near the open end of each element and projecting radially therefrom, an aperture in said guide ring for each post, a finger piece connected to each element near the closed end thereof and projecting radially therefrom, and slots formed in said guide ring and in the radially outer part of the radially trochar part of each element through which said finger pieces extend and along which said finger pieces are moveable.
Claim 9
Dependent Claim
52 words
A trochar according to claim 3 in which said sheet elements comprises a first sheet element concave toward the axis of said trochar, and second and third sheet elements concave toward the said of said trochar and in radially spaced relation and receiving therebetween the circumferential ends of said first sheet element.
Claim 10
Dependent Claim
29 words
A trochar according to claim 8 which includes a compression spring between said second and third sheet elements adapted to engage the circumferential ends of said first sheet element.
Claim 11
Dependent Claim
28 words
A trochar according to claim 8 in which said first sheet element comprises a double walled tubular member which is thin in the radial direction of said trochar.
Claim 12
Dependent Claim
19 words
A trochar according to claim 3 in which said trochar includes flange means at the guide ring end thereof.
Claim 13
Dependent Claim
22 words
A trochar according to claim 11 in which said flanges are connected to the axially outwardly facing end of said guide ring.
Claim 14
Dependent Claim
18 words
A trochar according to claim 1 which includes means for locking said adjustable means in adjusted position thereof.
Claim 15
Dependent Claim
17 words
A trochar according to claim 1 in which said sheet means is formed of corrosion resistant metal.
Claim 16
Dependent Claim
13 words
A trochar according to claim 14 in which said metal is stainless steel.
Claim 17
Dependent Claim
25 words
A trochar according to claim 3 which includes retaining means retaining the overlapping regions of said sheet means in close face to face sliding engagement.
Claim 18
Dependent Claim
58 words
A trochar according to claim 16 in which each said retaining means comprises an element secured to the radially inner one of said sheet means and projecting outwardly therefrom and then axially along the outside of the radially outer one of said sheet means and slidably engaging the outside of said radially outer one of said sheet means.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |