EP0195637A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An infusion apparatus
Assignee: Knight Robert Leonard Harry
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Filing: 1986-03-17
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Granted: —
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Expires: 2006-03-17
Abstract
Abstract An infusion pump pressure monitor comprises means (26, 27, 30, 31) to drive an infusion pump, a pressure sensor (38) to monitor the delivery pressure downstream of the pump, and a programmed computer (34,35) programmed to monitor the maximum delivery pressure that occurs during an initial operating period, and then, subsequently to monitor the delivery pressure downstream of the pump for the remainder of the delivery period of the infusion pump. The programmed computer (34, 35) is programmed to disable the means (26, 27, 30, 31) to drive the infusion pump if the monitored delivery pressure differs by more than a predetermined amount from the maximum pressure monitored during the initial operating period. The infusion liquid is carded by a disposable infusion set having a pressure responsive chamber (1) located in a key-hole shaped slot (44) in the pressure monitor.
Inventors
- 👤 Alan Stuart Balding
- 👤 Nigel Fawbert Carter
- 👤 Paul Frederick Frampton
- 👤 Vincent Anthony Rosso
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 02:38
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16831; A61M5/16854; Y; Y10; Y10S; Y10S128/00; Y10S128/13
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
An infusion pump pressure monitor comprising means (26, 27, 30, 31) to drive an infusion pump, a pressure sensor (38) to monitor the delivery pressure downstream of the pump, and a programmed computer (34, 35) programmed to monitor the maximum output of the sensor (38) and hence the maximum delivery pressure that occurs during an initial operating period, and then, subsequently to monitor the output of the sensor (38) and hence the delivery pressure downstream of the pump for the remainder of the delivery period of the infusion pump, the programmed computer (34, 35) being programmed to disable the means (26, 27, 30, 31) to drive the infusion pump if the monitored delivery pressure differs by more than a predetermined amount from the maximum pressure monitored during the initial operating period.
Claim 2
Dependent Claim
131 words
An infusion pump pressure monitor comprising means (26, 27, 30, 31) to drive an infusion pump, a pressure sensor (38) to monitor the delivery pressure downstream of the pump, and a programmed computer (34, 35) programmed to monitor the maximum output of the sensor (38) and hence the maximum delivery pressure that occurs during an initial operating period, and then, subsequently to monitor the output of the sensor (38) and hence the delivery pressure downstream of the pump for the remainder of the delivery period of the infusion pump, the programmed computer (34, 35) being programmed to disable the means (26, 27, 30, 31) to drive the infusion pump if the monitored delivery pressure differs by more than a predetermined amount from the maximum pressure monitored during the initial operating period.
Claim 3
Dependent Claim
88 words
An infusion pump pressure monitor according to claim 1, which also includes a memory (35) programmed with both high and low pressure default values and in which the programmed computer (34) is programmed to compare the monitored output of the pressure sensor (38) with the high and low pressure default values and to disable the means (25, 27, 30, 31) to drive the infusion pump if the monitored delivery pressure is outside the range defined by the high and low pressure default values during the initial operating period.
Claim 4
Dependent Claim
35 words
An infusion pump pressure monitor according to claim 1 or 2, in which the pressure sensor (38) is arranged to provide an averaged value of the maximum delivery pressure occurring during the initial operating period.
Claim 5
Dependent Claim
121 words
An infusion pump pressure monitor according to claim 3, in which the programmed computer (34) derives from the maximum averaged monitored delivery pressure a maximum and minimum acceptable delivery pressure, loads these values into the memory (34) and then, subsequently, after the initial operating period, compares the averaged monitored pressure with the values stored in the memory (34), the programmed computer (34) allowing the infusion to proceed only if the averaged monitored value falls within the range defined by the maximum and minimum acceptable delivery pressure values and also falls within the range defined by the maximum and minimum default pressure values and disabling the means (26, 27, 30, 31) to drive the infusion pump if these conditions are not met.
Claim 6
Dependent Claim
52 words
An infusion pump pressure monitor according to claim 3 or 4, in which the programmed computer (34) is programmed to perform its derivation of maximum and minimum acceptable delivery pressures automatically each time that the monitor is actuated and on each occasion that the delivery rate of the infusion pump is varied.
Claim 7
Dependent Claim
36 words
An infusion pump pressure monitor according to any one of the preceding claims, in which the programmed computer (34) not only disables the infusion pump drive (26, 27, 30, 311 but also triggers an alarm (371.
Claim 8
Dependent Claim
203 words
A liquid infusion set for use in infusing medical liquid into a patient including a pressure responsive chamber (1) to enable the infusion pressure of the medical liquid to be monitored during infusion by an associated pressure sensor, the pressure responsive chamber (1) comprising a substantially rigid, hollow housing (10) having a flanged end face (11), and a resilient flexible diaphragm (12) connected to the flange (11) and covering the end face, the housing (10) also having a liquid inlet (16) and a liquid outlet (17) passage in communication with the inside of the housing (10) and hence in communication with an inside face of the diaphragm (12), the liquid inlet (16) and outlet (17) passage being mutually orthogonal with one of them extending substantially normally away from the diaphragm (12), in use, the flanged end (11) of the housing (10) co-operating with a keyhole-shaped slot (44) in the pressure sensor to associate the diaphragm (12) with a sensing element (38), and the said one of the inlet (16) and outlet (17) passage providing at least part of finger gripping means (18, 19, 20) to enable the pressure responsive chamber (1) to be manoeuvred into the keyhole-shaped slot (44) of the pressure sensor.
Claim 9
Dependent Claim
203 words
A liquid infusion set for use in infusing medical liquid into a patient including a pressure responsive chamber (1) to enable the infusion pressure of the medical liquid to be monitored during infusion by an associated pressure sensor, the pressure responsive chamber (1) comprising a substantially rigid, hollow housing (10) having a flanged end face (11), and a resilient flexible diaphragm (12) connected to the flange (11) and covering the end face, the housing (10) also having a liquid inlet (16) and a liquid outlet (17) passage in communication with the inside of the housing (10) and hence in communication with an inside face of the diaphragm (12), the liquid inlet (16) and outlet (17) passage being mutually orthogonal with one of them extending substantially normally away from the diaphragm (12), in use, the flanged end (11) of the housing (10) co-operating with a keyhole-shaped slot (44) in the pressure sensor to associate the diaphragm (12) with a sensing element (38), and the said one of the inlet (16) and outlet (17) passage providing at least part of finger gripping means (18, 19, 20) to enable the pressure responsive chamber (1) to be manoeuvred into the keyhole-shaped slot (44) of the pressure sensor.
Claim 10
Dependent Claim
87 words
A liquid infusion set according to claim 7, in which the flanged end (11) of the housing (10) is circular and the flange (111 forms the outer extremity of a dished face, the housing (10) also including a hollow box-like portion (14) opening into the dished face and extending in a direction away from the diaphragm (12), the inlet passage (16) opening into one end of the hollow box-like portion (14) .and the outlet passage (17) opening into the other end of the hollow box-like portion (14).
Claim 11
Dependent Claim
58 words
A liquid infusion set according to claim 8, in which the finger-gripping means also includes an additional web (18) extending between the said one of the inlet (16) and the outlet (17) passage and the rear face of the box-like portion (14) of the housing (10) remote from the diaphragm, the web (18) being generally rectangular in shape.
Claim 12
Dependent Claim
94 words
A pressure monitor in accordance with any one of claims 1 to 6 in combination with an infusion set in accordance with claim 7, 8 or 9, in which the pressure monitor includes a load surface (40) and includes a key-hole shaped slot (44), and in which the housing (10) of the infusion set is engaged in the key-hole shaped slot (44) with the resilient flexible diaphragm (12) resting against the load surface (40) of the pressure sensor to enable the pressure within the infusion set to be transmitted to the load surface (40).
Claim 13
Dependent Claim
59 words
The combination according to claim 10, in which the load surface (40) is located at the free end of a cantilevered beam (41) which has strain gauges (43) fixed to it to provide the sensing element (38) and to enable the degree of bending of the beam (41), and hence the pressure within the infusion set to be monitored.
Claim 14
Dependent Claim
43 words
The combination of claim 10 or 11, in which the pressure monitor includes a switch (30) which is actuated only when the housing (10) of the infusion set is correctly positioned, to prevent actuation of the infusion pump unless the switch is actuated.
References Cited (Backward Citations)
No citation records indexed.
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