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GB2357975A - Syringe pump mechanism - Google Patents

Syringe pump mechanism Download PDF

Info

Publication number
GB2357975A
GB2357975A GB9929212A GB9929212A GB2357975A GB 2357975 A GB2357975 A GB 2357975A GB 9929212 A GB9929212 A GB 9929212A GB 9929212 A GB9929212 A GB 9929212A GB 2357975 A GB2357975 A GB 2357975A
Authority
GB
United Kingdom
Prior art keywords
syringe
syringe pump
pump mechanism
rotational
door
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Withdrawn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
GB9929212A
Other versions
GB9929212D0 (en
Inventor
Janet Murphy
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9929212A priority Critical patent/GB2357975A/en
Publication of GB9929212D0 publication Critical patent/GB9929212D0/en
Priority to GB0011264A priority patent/GB0011264D0/en
Publication of GB2357975A publication Critical patent/GB2357975A/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Withdrawn legal-status Critical Current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
    • A61M5/1456—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A syringe pump mechanism having a rotational square cut thread <B>6</B> and securing door <B>2</B> which act together to retain the plunger <B>8</B> of a syringe. Mechanical coupling between a motor assembly <B>4</B> and the thread <B>6</B> allow rotational movement to be translated to linear movement of the syringe.

Description

2357975 SYRINGE PUNT MECHANISM This invention relates to a syringe pump
mechanism which may be incorporated into the design of a medical infusion pump forming an apparatus to actuate disposable syringes at an electronically controlled rate by causing the syringe plunger to move relative to the filled section of the syringe thus displacing fluid in the syringe,.
Syringe pump mechanisms must translate motor rotational movement into linear movement of the disposable syringe plunger. In addition, they must enable the easy ination of the syringe and hold the syringe in a se-cure manner to prevent accidental removal whilst still providing for precision linear movement of the plunger plate of the syringe. These requirements meart that syringe pump mechanisms are complex, incorporatmg a mechanical clutch mechanism to disengage drive flom the syringe to facilitate installation of the syringe- An c6ject of this invention is to provide a syringe pump mechanism which achieves all the necessary functions of accuracy of linear movement, security against accidental removal, and case of kx-,ffiort of h in a degign.h uge; &w movioS pang aM m3 tunital- Clutch thetha-nisin, Accordingly, this invention provider, a syringe pump mechanism which includes a single drive g ciF qu-cut d widta piWh of' sufficient imgtfftude to all the of die disposable syrmige plunger plate in betweenadjacent sue threads. The syringe plunger plate is held securely in contact with the drive screw by the action of a closing door piece. Apart. flom the motor drive an infusion pump, utilising such a mechanism would comprise of only two moyring parts.
A preferred embodiment of the invention will be described with reference to the. accompanying drawings in which:
Figure 1 shows a side view ofthe complete.hanism.
Figure 2 shows the end-on view of the mechanism showing the drive 9crew (6) engagimg the sy-.mge plunger plate (8) which is held in on by the retaiffing door lever (2) As shown 'm Figure 1 the mechanism comprises a syringe support (1) and an end block (7) between which is located a rotational bmad gauge square-cut flimad dh-v,-- screvy (6). A plastic disposable syringe (M) is held in position by syringe support (1). The plunger plate (8) of the disposable syringe, locates into the gap between adiacent screw tbxcad-,q s-4wh tbat, ass. the drive screw (6) is rotated by the iictioti of mi otor drive unit (4) and train (5), the plungdr plate. (9) is moved forward along the length axis of the syringe. A rig door lever (2y alknvs for the -ydnge to be installed or removed when open, but retains the syringe securely when closed.
Figure 2 shows, end-on, the relative positions of drive screw (6), syringe plunger plate (3) and retaining door (2). No lateral movement of the syringe plunger plate (9) is possible since it is held in position by contact with the drive screw (6), the syringe pump casing (9) and the door (2).
2

Claims (4)

1. A syringe pump mechanism mcluding a rotational broad pitch square cut screw thread and securing door so arranged that a syringe plunger m be retained between adjacen:t threads of the screw and the door piece.
2. A mechanism as claimed in Claim 1 where mechanical coupling between the rotational screw thread and a motor can cause the rotation of the thread and the linear movement of the retained syringe
3. A mechanism as claimed in Claim 1 or Claim 2 where the securing door may be opened away from the rotational screw thread to allow insertion of a syringe into the mechanism.
4. A syringe pump mechanism substantially as herein described and illustrated m the accompanying drawings.
GB9929212A 1999-12-10 1999-12-10 Syringe pump mechanism Withdrawn GB2357975A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9929212A GB2357975A (en) 1999-12-10 1999-12-10 Syringe pump mechanism
GB0011264A GB0011264D0 (en) 1999-12-10 2000-05-11 Medical infusion pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9929212A GB2357975A (en) 1999-12-10 1999-12-10 Syringe pump mechanism

Publications (2)

Publication Number Publication Date
GB9929212D0 GB9929212D0 (en) 2000-02-02
GB2357975A true GB2357975A (en) 2001-07-11

Family

ID=10866062

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9929212A Withdrawn GB2357975A (en) 1999-12-10 1999-12-10 Syringe pump mechanism
GB0011264A Ceased GB0011264D0 (en) 1999-12-10 2000-05-11 Medical infusion pump

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB0011264A Ceased GB0011264D0 (en) 1999-12-10 2000-05-11 Medical infusion pump

Country Status (1)

Country Link
GB (2) GB2357975A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255096A (en) * 1979-01-08 1981-03-10 Baxter Travenol Laboratories, Inc. Drive for syringe pump
US4435173A (en) * 1982-03-05 1984-03-06 Delta Medical Industries Variable rate syringe pump for insulin delivery
US4769009A (en) * 1986-10-10 1988-09-06 Cobe Laboratories, Inc. Apparatus for displacing a piston in a chamber having a torque resistor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255096A (en) * 1979-01-08 1981-03-10 Baxter Travenol Laboratories, Inc. Drive for syringe pump
US4435173A (en) * 1982-03-05 1984-03-06 Delta Medical Industries Variable rate syringe pump for insulin delivery
US4769009A (en) * 1986-10-10 1988-09-06 Cobe Laboratories, Inc. Apparatus for displacing a piston in a chamber having a torque resistor

Also Published As

Publication number Publication date
GB9929212D0 (en) 2000-02-02
GB0011264D0 (en) 2000-06-28

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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)