Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-11-03
1999-03-16
Hindenburg, Max
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
A61M 100
Patent
active
058823387
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/GB94/00909, filed Apr. 28, 1994.
This invention relates to syringes and syringe pumps and more particularly, but not necessarily exclusively, to such devices applied to the delivery of medicament, including anaesthetics, to medical patients.
Syringes have been in use for many years for delivering medicament, including anaesthetics, by doctors and nurses to medical patients, both inside and outside hospitals. Originally, syringes were always operated manually by the doctor or nurse. Manual operation of a syringe is not however suitable where the medicament is to be delivered to the patient at an accurately controlled rate over a relatively long period of time.
A more recent development is that of the syringe pump, being a device upon which a syringe containing medicament can be mounted. The syringe is securely retained on the syringe pump, and the plunger rod of the syringe is engaged by a drive device which can move in the axial direction of the mounted syringe in order to deliver medicament therefrom. In some types of syringe pump the drive device is a linearly-acting member constrained to move in a straight line along the syringe pump, whereas in other types of syringe pump the drive device can comprise a rotary screw cooperable with a fixed nut. When the screw is driven in rotation it cooperates with the fixed nut and moves axially to drive the syringe plunger rod.
Conventionally, the syringe is filled with medicament by the doctor or nurse and properly located on the syringe pump. The syringe pump comprises computer control means for controlling the syringe drive device and comprising a keyboard and display. The doctor or nurse can program the computer control means through the keyboard, setting for example the continuous medicament flow rate which is required for the particular patient concerned, and the duration of the infusion which is required.
DE-A-4020522 discloses a syringe pump wherein the flow rate can be influenced by the syringe size, indicated by means of the valve of a resistance incorporated in a syringe pump trough corresponding to a particular syringe.
There is further disclosed in International Publication No. WO 91/04759 a syringe pump which can operate with a syringe having a bar code thereon to program the computer control means with data for a particular patient's dosage requirements. Instead of these data being inputted via a keyboard the pharmacist prepares the programming bar code and applies it to the syringe, when he has filled the syringe, in dependence upon a prescription tailored to the patient's requirements and provided by the patient's physician. The patient mounts the bar coded syringe on the syringe pump, which programs the computer control means automatically via a bar code reader.
The syringe pump is thereby driven entirely in accordance with the physician's prescription, which prevents injury to the patient through his or her improper operation of the syringe pump keyboard. It is possible for the patient to modify the dispensing of the medicament to some extent, for example if a supplemental dose is required, but the physician's data applied to the syringe by means of a bar code by the pharmacist would limit the amounts and frequency of taking the medicament so as to prevent the patient injuring him or herself.
Hereinbefore it has been assumed that the syringe is always filled with medicament by the doctor, nurse or, in the latter example, by the pharmacist. There has however been a proposal for drug manufacturers to supply syringes, pre-filled with their products, for example to hospitals. It would then simply remain for the appropriate hospital personnel to place the pre-filled syringe on a syringe pump, which would then drive the syringe plunger rod at a controllable rate and for a controllable time, which could be entered via the keyboard by the doctor or nurse in accordance with the patient's requirements. There thus need be no transfer of medicament from a vial or bottle to the syringe, and moreo
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Hindenburg Max
Zeneca Limited
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