GB2301419A - Drive mechanism - Google Patents

Drive mechanism

Info

Publication number
GB2301419A
GB2301419A GB9620182A GB9620182A GB2301419A GB 2301419 A GB2301419 A GB 2301419A GB 9620182 A GB9620182 A GB 9620182A GB 9620182 A GB9620182 A GB 9620182A GB 2301419 A GB2301419 A GB 2301419A
Authority
GB
United Kingdom
Prior art keywords
lead screw
engaging
engaging element
traveller
grooves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9620182A
Other versions
GB9620182D0 (en
Inventor
Anthony Richard Cobb
Syed Mujahid Zaidi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graseby Medical Ltd
Original Assignee
Graseby Medical Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graseby Medical Ltd filed Critical Graseby Medical Ltd
Publication of GB9620182D0 publication Critical patent/GB9620182D0/en
Publication of GB2301419A publication Critical patent/GB2301419A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/2025—Screw mechanisms with means to disengage the nut or screw from their counterpart; Means for connecting screw and nut for stopping reciprocating movement
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/1458—Means for capture of the plunger flange

Abstract

A lead screw drive comprises a lead screw (10) which is rotated by a motor. A traveller (40) is clamped at one end to a rod (14) parallel to the lead screw, the rod in turn engaging the plunger of a medical syringe. The other end of the traveller (40) has a U-shaped engaging element (42) with the two parallel arms (44, 46) thereof having grooves on their inner surfaces for engaging with the lead screw thread. The grooves also extend upwardly and downwardly of the region of engagement with the lead screw thread and radial movement of the engaging element (42) therefore moves the region of contact with the lead screw without causing disengagement. The device is particularly suitable for use with a medical syringe pump, to prevent inadvertent disengagement of the engaging element from the lead screw.
GB9620182A 1995-02-03 1996-02-02 Drive mechanism Withdrawn GB2301419A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9502877.5A GB9502877D0 (en) 1995-02-03 1995-02-03 Drive mechanism
PCT/GB1996/000228 WO1996023535A1 (en) 1995-02-03 1996-02-02 Drive mechanism

Publications (2)

Publication Number Publication Date
GB9620182D0 GB9620182D0 (en) 1996-11-13
GB2301419A true GB2301419A (en) 1996-12-04

Family

ID=10769582

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9502877.5A Pending GB9502877D0 (en) 1995-02-03 1995-02-03 Drive mechanism
GB9620182A Withdrawn GB2301419A (en) 1995-02-03 1996-02-02 Drive mechanism

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9502877.5A Pending GB9502877D0 (en) 1995-02-03 1995-02-03 Drive mechanism

Country Status (3)

Country Link
EP (1) EP0754066A1 (en)
GB (2) GB9502877D0 (en)
WO (1) WO1996023535A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978261A (en) * 1989-12-08 1990-12-18 Wright Iii Charles O Quill stop
EP0445499A1 (en) * 1990-01-08 1991-09-11 Ivac Corporation Screw drive engagement/disengagement and decoupling mechanism
GB2247665A (en) * 1990-09-06 1992-03-11 Carl Morris Jacking device
EP0514816A1 (en) * 1991-05-23 1992-11-25 Ivac Corporation Dynamic lead screw engagement and indicator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978261A (en) * 1989-12-08 1990-12-18 Wright Iii Charles O Quill stop
EP0445499A1 (en) * 1990-01-08 1991-09-11 Ivac Corporation Screw drive engagement/disengagement and decoupling mechanism
GB2247665A (en) * 1990-09-06 1992-03-11 Carl Morris Jacking device
EP0514816A1 (en) * 1991-05-23 1992-11-25 Ivac Corporation Dynamic lead screw engagement and indicator

Also Published As

Publication number Publication date
GB9502877D0 (en) 1995-04-05
WO1996023535A1 (en) 1996-08-08
EP0754066A1 (en) 1997-01-22
GB9620182D0 (en) 1996-11-13

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)