Patent US4993947A successfully refreshed from Google Patents.
US4993947A
Expired / Lapsed
US
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Equipment for the treatment of dental roots
Assignee: ESTIER BERNARD
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Filing: 1988-06-23
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Granted: 1991-02-19
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Expires: 2008-06-23
Abstract
Abstract The connection piece (2), which can be fitted in a sealed manner on an opening in the pulp chamber of a tooth, comprises a liquid injector (24) and a discharge duct (25) which lead into the pulp chamber. A vacuum pump (5) is connected to the discharge duct (25) so as to produce bubbles in the liquid inside the tooth. A pressure pump (3) connected to a liquid reservoir conveys the said liquid to the injector (24) so as to produce, by means of impulsion of the said bubbles, a cavitation in the liquid inside the tooth, owing to the action of the pressure.
Inventors
- 👤 Jean Grosrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:43
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/02; A61C17/0208; A61C5/00; A61C5/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
216 words
Equipment for the treatment of dental roots, comprising a connection piece (2), which can be fitted in a sealed manner on an opening in the pulp chamber of a tooth, said connection piece being provided with an injector (24) connected to a supply pipe (28) for conveying liquid into the tooth, and a duct (25) for discharging the liquid located inside the tooth, wherein the injector (24) and the discharge duct (25) lead into the pulp chamber when the connection piece (2) is fitted onto a tooth, the said equipment further comprising cavitation-inducing means including a gear pump (5) having an input side connected to the discharge duct (25), so as to control the mean pressure in the liquid inside the pulp chamber and inside the radicular channel of the tooth by providing continuous suction on the chamber, and said cavitationinducing means further including a piston pump (3) connected to said supply pipe and to a reservoir containing liquid to be conveyed to the injector (24), so as to perform complete filling of the tooth with said liquid and for producing alternate phases of suction and compression so as to induce a cavitation in the liquid inside the pulp chamber and inside the radicular channel(s) of the tooth, thus completely cleansing this cavity and these channels.
Claim 2
Dependent Claim
216 words
Equipment for the treatment of dental roots, comprising a connection piece (2), which can be fitted in a sealed manner on an opening in the pulp chamber of a tooth, said connection piece being provided with an injector (24) connected to a supply pipe (28) for conveying liquid into the tooth, and a duct (25) for discharging the liquid located inside the tooth, wherein the injector (24) and the discharge duct (25) lead into the pulp chamber when the connection piece (2) is fitted onto a tooth, the said equipment further comprising cavitation-inducing means including a gear pump (5) having an input side connected to the discharge duct (25), so as to control the mean pressure in the liquid inside the pulp chamber and inside the radicular channel of the tooth by providing continuous suction on the chamber, and said cavitationinducing means further including a piston pump (3) connected to said supply pipe and to a reservoir containing liquid to be conveyed to the injector (24), so as to perform complete filling of the tooth with said liquid and for producing alternate phases of suction and compression so as to induce a cavitation in the liquid inside the pulp chamber and inside the radicular channel(s) of the tooth, thus completely cleansing this cavity and these channels.
Claim 3
Dependent Claim
29 words
The equipment as claimed in claim 1, wherein the part of the injector (24) and the part of the discharge duct (25) located inside the dental cavity are concentric.
Claim 4
Dependent Claim
43 words
The equipment as claimed in claim 2, wherein the said part of the injector (24) is arranged concentrically around that of the discharge duct (25) and has a region with a cross-section at least ten times smaller than that of the discharge duct.
Claim 5
Dependent Claim
63 words
The equipment as claimed in claim 1 or 3, wherein the discharge duct is connected to the pump (5) by a pipe (30) which has an internal volume large enough for the liquid inside it to have an inertia opposing the acceleration of its flow towards the gear pump (5) during pressurization inside the tooth, so as to ensure rapid pressurization producing cavitation.
Claim 6
Dependent Claim
26 words
The equipment as claimed in claim 1, wherein the piston pump (3) is a single-acting pump, with a single automatic valve (14) on the suction side.
Claim 7
Dependent Claim
46 words
The equipment as claimed in claim 1, wherein the pressure pump (3) is provided with an adjustable stop (18) designed to cooperate with the automatic valve (14) at the end of its closure travel, so as to stop at an adjustable distance from its seat (19).
Claim 8
Dependent Claim
30 words
The equipment as claimed in claim 1, and further comprising several reservoirs (7) for various liquids and switching means (8) for connecting the piston pump (3) selectively to these reservoirs.
Claim 9
Dependent Claim
23 words
The equipment as claimed in claim 7, and further comprising means (1) for controlling the flowrate and the operating time of the pump.
Claim 10
Dependent Claim
41 words
The equipment as claimed in claim 8, wherein the said means for controlling the flowrate and the operating time of the pumps are arranged so as to ensure that the mean pressure inside the pump chamber, during treatment, is always negative.
Claim 11
Dependent Claim
21 words
The equipment as claimed in claim 7, and further comprising means for controlling the switching means in accordance with a program.
Claim 12
Dependent Claim
65 words
The equipment as claimed in claim 1, and further comprising means for measuring the electrical resistance of the liquid inside the pulp chamber and the radicular channel(s), which means comprise an electrode consisting of the part of the discharge duct located inside this cavity, and another electrode intended to be placed in damp contact with the body of the patient whose tooth is being treated.
Claim 13
Dependent Claim
38 words
The equipment as claimed in claim 1, wherein the relative pressure inside the pulp chamber is variable between 0 and 0.5 bar, and wherein the relative negative pressure inside this chamber is variable between 0 and -0.8 bar.
Claim 14
Dependent Claim
120 words
The equipment as claimed in claim 1, and further comprising an air filtering and heating device (36) designed to be connected to the connection piece (2) in place of the gear pump (5) so as to ensure drying of the dental cavity, and also comprising, a syringe (37) containing dental paste, intended to be connected via a pipe (38) to the connection piece, in place of the air filtering and heating device (36), and a member (39) for closing the pipe (28) joining a vacuum pump (41) to the connection piece (2), so as to cause filling of the dental cavity with the filling paste, as a result of the vacuum created inside this cavity by said vacuum pump (41).
References Cited (Backward Citations)
AT147367B
Cited
AT150414B
Cited
DE691027C
Cited
CH294164A
Cited
US3079690A
Cited
US3871099A
Cited
US3919775A
Cited
US4021921A
Cited
US4247288A
Cited
EP0201119A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |