US4747824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypodermic anesthetic injection method
Assignee: Milestone Scientific Inc
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Filing: 1986-05-30
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Granted: 1988-05-31
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Expires: 2006-05-30
Abstract
Abstract A method and apparatus for effecting painless hypodermic needle administration of liquid anesthetics particularly in dentistry in which the needle is carried on a light wand and the anesthetic is delivered to the needle by motive means independently of the operator's fingers during penetration of the needle, with both the rates of penetration and expression of liquid being controlled to achieve intermediate numbing followed by a high rate of liquid expression, if desired, to achieve full anesthesia of the site.
Inventors
- 👤 Ronald P. Spinello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/1452; A61M5/14546; A61M5/178; A61M5/20; A61M2202/00; A61M2202/04; A61M2202/0468; A61M2202/048
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A method for anesthetizing body tissue by means of local anesthetic using a hollow hypodermic needle, the steps of establishing a uniform flow of anesthetic at a flow rate less than 1.0 cc. per minute through the needle no later than the instant of entry into the tissue maintaining said uniform flow while moving the needle into the tissue, whereby said flow rate is sufficient to establish and maintain a sheath of liquid anesthetic around the forward portion of the moving needle thereby to anesthetize the path of travel of the needle.
Claim 2
Independent Claim
92 words
A method for anesthetizing body tissue by means of local anesthetic using a hollow hypodermic needle, the steps of establishing a uniform flow of anesthetic at a flow rate less than 1.0 cc. per minute through the needle no later than the instant of entry into the tissue maintaining said uniform flow while moving the needle into the tissue, whereby said flow rate is sufficient to establish and maintain a sheath of liquid anesthetic around the forward portion of the moving needle thereby to anesthetize the path of travel of the needle.
Claim 3
Dependent Claim
50 words
The method of claim 1 including the steps of maintaining the flow rate beneath that which would displace and tear tissue and continuing the liquid discharge after the needle is fully implanted to form an anesthetic absorption plume around the needle tip to numb a localized space for further treatment.
Claim 4
Dependent Claim
29 words
The method of claim 2 including the step of thereafter increasing the rate of expression of liquid to drive the liquid to nerve sites within the localized numb area.
Claim 5
Dependent Claim
19 words
The method of claim 3 in which the increased flow rate is between 2 and 4 cc. per minute.
References Cited (Backward Citations)
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Cited
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Cited
US4141359A
Cited
US4597754A
Cited
US4323066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |