US5505697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically powered jet injector
Assignee: Individual
•
Filing: 1994-01-14
•
Granted: 1996-04-09
•
Expires: 2014-01-14
Abstract
Abstract An electrically powered jet injector impacts a plunger driver against a plunger to generate a high initial pressure pulse, for piercing the skin. The plunger driver then continues to generate a lower delivery pressure until the injection is completed. A microprocessor within the injector controls the speed and direction of the electric motor which moves the plunger driver. The injector provides a subcutaneous injection especially useful for injecting insulin to treat diabetes.
Inventors
- 👤 Charles N. McKinnon, Jr.
- 👤 James T. Potter
- 👤 Ken Mattocks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:55
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/30; A61M2205/00; A61M2205/50; A61M5/48; A61M5/484
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
107 words
A jet injector for providing a jet injection by driving a plunger into an ampule, comprising: a housing; an electric motor supported by the housing; a ball screw driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw, the encoder comprising an encoder wheel rotating in proportion to rotation of the motor; a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and means for attaching the ampule to the housing.
Claim 2
Dependent Claim
107 words
A jet injector for providing a jet injection by driving a plunger into an ampule, comprising: a housing; an electric motor supported by the housing; a ball screw driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw, the encoder comprising an encoder wheel rotating in proportion to rotation of the motor; a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and means for attaching the ampule to the housing.
Claim 3
Dependent Claim
14 words
The jet injector of claim 1 further comprising a control panel on the housing.
Claim 4
Dependent Claim
14 words
The injector of claim 1 wherein the motor is coaxial with the ball screw.
Claim 5
Dependent Claim
22 words
The jet injector of claim 1 further comprising an electrical energy source within the housing for powering the electric motor and controller.
Claim 6
Dependent Claim
22 words
The jet injector of claim 1 wherein the detector is a switch actuated by contact of the ball screw against the plunger.
Claim 7
Dependent Claim
13 words
The jet injector of claim 1 further comprising a display on the housing.
Claim 8
Dependent Claim
93 words
A jet injector for providing a jet injection by driving a plunger into an ampule, comprising: a housing; an electric motor supported by the housing; a ball screw driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw; a switch electrically linked to the controller and positioned to actuate when the ball screw contacts the plunger; and means for attaching the ampule to the housing.
Claim 9
Dependent Claim
93 words
A jet injector for providing a jet injection by driving a plunger into an ampule, comprising: a housing; an electric motor supported by the housing; a ball screw driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw; a switch electrically linked to the controller and positioned to actuate when the ball screw contacts the plunger; and means for attaching the ampule to the housing.
Claim 10
Dependent Claim
13 words
The jet injector of claim 7 further comprising a display on the housing.
Claim 11
Dependent Claim
17 words
The injector of claim 7 wherein the means for attaching comprises a sleeve threaded onto the housing.
Claim 12
Dependent Claim
14 words
The injector of claim 7 wherein the motor is coaxial within the ball screw.
Claim 13
Dependent Claim
14 words
The jet injector of claim 7 further comprising a control panel on the housing.
Claim 14
Dependent Claim
16 words
The jet injector of claim 7 wherein the motor is a DC brushless hollow core motor.
Claim 15
Dependent Claim
22 words
The jet injector of claim 7 further comprising an electrical energy source within the housing for powering the electric motor and controller.
Claim 16
Dependent Claim
20 words
The injector of claim 7 wherein the encoder comprises an encoder wheel rotating in proportion to rotation of the motor.
Claim 17
Dependent Claim
98 words
A jet injector for providing a jet injection by driving a plunger into an ampule, comprising; a housing; an electric motor supported by the housing; a ball screw coaxial with the motor and driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw; a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and means for attaching the ampule to the housing.
Claim 18
Dependent Claim
98 words
A jet injector for providing a jet injection by driving a plunger into an ampule, comprising; a housing; an electric motor supported by the housing; a ball screw coaxial with the motor and driven longitudinally within the housing by the motor; a controller electrically connected to the motor for controlling the motor speed and direction; an encoder electrically connected to the controller and positioned to measure rotation of the ball screw; a detector electrically linked to the controller and positioned to detect when the ball screw contacts the plunger; and means for attaching the ampule to the housing.
Claim 19
Dependent Claim
17 words
The injector of claim 15 wherein the means for attaching comprises a sleeve threaded onto the housing.
Claim 20
Dependent Claim
14 words
The jet injector of claim 15 further comprising a control panel on the housing.
Claim 21
Dependent Claim
16 words
The jet injector of claim 15 wherein the motor is a DC brushless hollow core motor.
Claim 22
Dependent Claim
22 words
The jet injector of claim 15 further comprising an electrical energy source within the housing for powering the electric motor and controller.
Claim 23
Dependent Claim
20 words
The injector of claim 15 wherein the encoder comprises an encoder wheel rotating in proportion to rotation of the motor.
Claim 24
Dependent Claim
21 words
The injector of claim 15 wherein the detector is a switch actuated by contact of the ball screw against the plunger.
Claim 25
Dependent Claim
14 words
The injector of claim 15 wherein the motor is coaxial with the ball screw.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |