GB2250599A - Cuff pressure monitor for a medico-surgical tube - Google Patents

Cuff pressure monitor for a medico-surgical tube Download PDF

Info

Publication number
GB2250599A
GB2250599A GB9124714A GB9124714A GB2250599A GB 2250599 A GB2250599 A GB 2250599A GB 9124714 A GB9124714 A GB 9124714A GB 9124714 A GB9124714 A GB 9124714A GB 2250599 A GB2250599 A GB 2250599A
Authority
GB
United Kingdom
Prior art keywords
cuff
inflation
pressure monitor
indicator
inflation indicator
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.)
Granted
Application number
GB9124714A
Other versions
GB2250599B (en
GB9124714D0 (en
Inventor
Christopher Stratton Turnbull
Brian Crawley
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB9124714D0 publication Critical patent/GB9124714D0/en
Publication of GB2250599A publication Critical patent/GB2250599A/en
Application granted granted Critical
Publication of GB2250599B publication Critical patent/GB2250599B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/04—Tracheal tubes
    • A61M16/0434—Cuffs
    • A61M16/044—External cuff pressure control or supply, e.g. synchronisation with respiration
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
    • 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/10—Balloon catheters
    • A61M25/1018—Balloon inflating or inflation-control devices
    • A61M25/10184—Means for controlling or monitoring inflation or deflation
    • 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/10—Balloon catheters
    • A61M25/1018—Balloon inflating or inflation-control devices
    • A61M25/10184—Means for controlling or monitoring inflation or deflation
    • A61M25/10187—Indicators for the level of inflation or deflation
    • 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/10—Balloon catheters
    • A61M25/1018—Balloon inflating or inflation-control devices
    • A61M25/10184—Means for controlling or monitoring inflation or deflation
    • A61M25/10187—Indicators for the level of inflation or deflation
    • A61M25/10188—Inflation or deflation data displays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8326—Fluid pressure responsive indicator, recorder or alarm

Description

22s0599 PRESSURE MONITORS AND TUBE ASSEMBLIES This invention relates to
cuff pressure monitors and tube assemblies.
The invention is more particularly concerned with pressure monitors for measuring the pressure in cuffed medico-surgical tubes, such as endotracheal tubes or tracheostomy tubes.
Tracheal tubes are used to transmit anaesthetic or ventilation gases to a patient, such as during surgery, or to provide an airway to the trachea when the patient is breathing spontaneously. These tubes often have a cuff around the tube close to the patient end which is inflated to seal with the trachea so that gas flow is confined within the tube. The cuff is inflated and deflated via a small-bore lumen extending along the tube within its wall which opens into the cuff close to the distal or patient end, and is connected to one end of an inflation line close to the proximal or machine end of the tube. The other end of the inflation line extends outside the patient and has a connector and an inflation indicator in the form of an inflatable balloon the interior of which communicates with the interior of the inflation line. The cuff is initially deflated and, after insertion of the tube into the trachea, is inflated by means of a syringe or similar device coupled to the connector, which administers a measured volume of air. This causes inflation of the cuff and the indicator. The indicator provides visual evidence to the clinician of the state of inflation of the cuff.
These tubes may remain in place for some time and the pressure within the cuff can change during this time. The pressure may increase because of diffusion of anaesthetic gases through the wall of the cuff. Alternatively, the pressure may decrease because of leakage. Although the inflation balloon indicates large changes in pressure of the cuff, it is not very sensitive to small changes in pressure. It is desirable to be able to maintain the cuff at the correct pressure because too high a pressure can lead to damage to the tracheal lining, whereas too low a pressure can allow leakage of gas between the tube and the trachea. Pressure gauges are available which can be coupled to the connector at the machine end of the inflation line but these are generally bulky and expensive. Their size and weight make them unsuitable for attachment to a tube long term.
it is an object of the present invention to provide an alternative pressure monitor which can be used to monitor cuff pressure.
- 3 According to one aspect of the present invention there is provided a cuff pressure monitor for use on a cuffed medico-surgical tube of the kind for insertion into a body cavity and having a flexible inflation indicator located externally of the body which communicates with the cuff and is inflated on inflation of the cuff, the monitor being adapted to be attached with the inflation indicator and having pressure sensor means that contacts the exterior of the inflation indicator such that change in inflation of the indicator causes a change in the output of the pressure sensor means, and the monitor includes display means arranged to receive the output of the pressure sensor means and to provide a display representation indicative of pressure in the cuff.
The inflation indicator is preferably a flexible balloon. The monitor may be removable from the inflation indicator and may be adapted for use with a cuffed medico-surgical tube of the kind in which the inflation indicator is provided at one end of a coupling by which fluid can be supplied to the cuff, the pressure monitor being adapted to clip onto the coupling. The monitor may include a plate extending on one side of the inflation indicator and a means resiliently urging the pressure sensor means in contact with the opposite side of the inflation indicator. The pressure sensor means is preferably an electrical pressure sensor such as including a silicon strain gauge. The display is preferably a numeric display and may be a liquid crystal display.
According to another aspect of the present invention there is provided a medico-surgical tube having an inflatable cuff close to one end which is in use adapted to seal the tube with a body cavity within which the one end of the tube is inserted, and a flexible inflation indicator which communicates with the cuff and is inflated on inflation of the cuff, the inflation indicator in use being located externally of the body cavity; and a cuff pressure monitor according to the above one aspect of the invention attached with the inflation indicator.
According to a further aspect of the present invention there is provided a tracheal tube assembly comprising: a tracheal tube having an inflatable cuff close to one end which is adapted in use to seal the tube with the trachea, and a flexible inflation indicator which communicates with the cuff and is inflated on inflation of the cuff, the inflation indicator in use being located externally of the patient; and a cuff pressure monitor according to above one aspect of the invention attached with the inflation indicator.
- 5 A cuff pressure monitor and a tube assembly including the monitor in accordance with the present invention, will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a side elevation view of the assembly; Figure 2 is a sectional side elevation view of the monitor to a larger scale; and Figure 3 is a transverse section along the line III - III of Figure 2.
With reference first to Figure 1, there is shown a conventional cuffed endotracheal tube 1 having an inflatable cuff 2 extending around the tube close to its patient end 3. The interior of the cuff 2 communicates with an inflation lumen 4 extruded along the length of the tube 1 within its wall. Towards the machine end 5 of the tube, one end of an inflation line 6 is connected into the lumen 4. The inflation line 6 is flexible and, in use extends out of the patient's mouth. At its other end, the inflation line 6 has a coupling 7, which may include a valve (not shown), and an inflation indicator 8 in the form of a flexible balloon or envelope sealed to one end of the coupling. The interior of the inflation indicator 8 communicates with the inflation line 6 and cuff 2 so that the indicator is inflated when the cuff is inflated. As so far described, the tube is conventional.
With reference now also to Figures 2 and 3, the pressure monitor 10 is removably clipped onto the outside of the coupling 7 at the machine end of the inflation line 6 and encompasses the inflation indicator 8. The pressure monitor 10 is contained in a plastic housing 11 of U-shape in section which has a flat base-plate 12 and an upper assembly 13 spaced from the base-plate by a short distance. The upper assembly 13 includes an electrical pressure sensor 14, such as including a silicon strain gauge, which is carried on a resilient, spring support 15 7 - and projects downwardly towards the base-plate 12. The electrical output of the pressure sensor 14 is supplied to a processor 16 which performs various conventional calibration, scaling and calculation operations on its input and provides display driver signals on line 17 to a multi- segment liquid crystal display LCD 18. Other displays could be used.
To the left of the upper assembly 13, the housing 11 is formed into a spring clip 19 which overlies and projects downwardly towards the base plate 12. The pressure monitor 10 also has a panel 20 on its side on which can be written pressure readings taken at different times. Alternatively, each pressure reading could be stored electronically within the processor 16.
In use, the pressure monitor 10 is clipped onto the coupling 7, so that the spring clip 19 firmly locates on the coupling, and so that the inflation indicator 8 lies between the base plate 12 and the upper assembly 13. The pressure sensor 14 is urged vertically downwards by the support 15 to contact the upper surface of the exterior of the inflation indicator 8. The output of the pressure sensor 14 depends on the pressure within the inflation indicator 8, and hence on the pressure within the cuff 2.
The pressure monitor 10 can be clipped onto the coupling and inflation indicator either before or after the cuff 2 is inflated, following intubation into the trachea. The display 18 can provide an indication of pressure in the cuff 2 on any standard pressure scale, or on an arbitary numeric scale. Alternatively, the indication of pressure could be provided on a non-numerical display, such as, for example, a bar graph display. Preferably each tube has its own pressure monitor 10 which is clipped in place when the tube is inserted and remains in place until the tube is removed. The nurse or anaesthetist can check the pressure reading periodically and, if the cuff pressure is too high or low, air can be inserted into or withdrawn from the cuff using a syringe inserted into the coupling 7 in the usual way. This operation of correcting the pressure in the cuff can be carried out whilst the monitor is in place. Alternatively, the pressure monitor 10 could be carried around in the pocket of the nurse or other user and clipped in place on different tubes as and when they are being checked. The pressure monitor 10 could include a visual or audible alarm that signals when the cuff pressure exceeds predetermined limits.
The pressure monitor is not limited to use on tracheal tubes but could be used on other medico-surgical tubes having a cuff that is inflated to seal the tube with the body cavity and a flexible inflation indicator communicating with the cuff.

Claims (1)

  1. A cuff pressure monitor for use on a cuffed medico-surgical tube of the kind for insertion into a body cavity and having a flexible inflation indicator located externally of the body which communicates with the cuff and is inflated on inflation of the cuff, wherein the monitor is adapted to be attached with the inflation indicator and has pressure sensor means that contacts the exterior of the inflation indicator such that change in inflation of the indicator causes a change in the output of the pressure sensor means, and wherein the monitor includes display means arranged to receive the output of the pressure sensor means and to provide a display representation indicative of pressure in the cuff.
    2.
    A cuff pressure monitor according to Claim 1, wherein the inflation indicator is a flexible balloon.
    A cuff pressure monitor according to Claim 1 or 2, wherein the monitor is removable from the inflation indicator.
    A cuff pressure monitor according to any one of the preceding claims, wherein the monitor is adapted for use with a cuffed medico-surgical tube of the kind in which the inflation indicator is provided at one end of a coupling by which fluid can be supplied to the cuff, and wherein the pressure monitor is adapted to clip onto the coupling.
    A cuff pressure monitor according to any one of the preceding claims, wherein the monitor includes a plate extending on one side of the inflation indicator and means resiliently urging the pressure sensor means in contact with the opposite side of the inflation indicator.
    6.
    A cuff pressure monitor according to any one of the preceding claims, wherein the pressure sensor means is an electrical pressure sensor.
    A cuff pressure monitor according to Claim 6, wherein the electrical pressure sensor includes a silicon strain gauge.
    A cuff pressure monitor according to any one of the preceding claims, wherein the display means is a numeric display.
    A cuff pressure monitor according to any one of the preceding claims, wherein the display means is a liquid crystal display.
    10.
    A cuff pressure monitor substantially as hereinbefore described with reference to the accompanying drawings.
    A inedico-surgical tube assembly comprising: a medico-surgical tube having an inflatable cuff close to one end which is in use adapted to seal the tube with a body cavity within which the one end of the tube is inserted, and a flexible inflation indicator which communicates with the cuff and is inflated on inflation of the cuff, the inflation indicator in use being located externally of the body cavity; and a cuff pressure monitor according to any one of the preceding claims attached with the inflation indicator.
    - 13 12. A tracheal tube assembly comprising: a tracheal tube having an inflatable cuff close to one end which is adapted in use to seal the tube with the trachea, and a flexible inflation indicator which communicates with the cuff and is inflated on inflation of the cuff, the inflation indicator in use being located externally of the patient; and a cuff pressure monitor according to any one of Claims 1 to 10 attached with the inflation indicator.
    13.
    14.
    A tracheal tube assembly substantially as hereinbefore described with reference to the accompanying drawings.
    Any novel feature or combination of features as hereinbefore described.
GB9124714A 1990-12-05 1991-11-21 Pressure monitors and tube assemblies Expired - Fee Related GB2250599B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB909026403A GB9026403D0 (en) 1990-12-05 1990-12-05 Pressure monitors

Publications (3)

Publication Number Publication Date
GB9124714D0 GB9124714D0 (en) 1992-01-15
GB2250599A true GB2250599A (en) 1992-06-10
GB2250599B GB2250599B (en) 1994-08-24

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Family Applications (2)

Application Number Title Priority Date Filing Date
GB909026403A Pending GB9026403D0 (en) 1990-12-05 1990-12-05 Pressure monitors
GB9124714A Expired - Fee Related GB2250599B (en) 1990-12-05 1991-11-21 Pressure monitors and tube assemblies

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB909026403A Pending GB9026403D0 (en) 1990-12-05 1990-12-05 Pressure monitors

Country Status (9)

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US (1) US5218970A (en)
EP (1) EP0489516B1 (en)
JP (1) JPH04272771A (en)
AU (1) AU646517B2 (en)
CA (1) CA2056904A1 (en)
DE (1) DE69110255T2 (en)
GB (2) GB9026403D0 (en)
IE (1) IE70329B1 (en)
IL (1) IL100142A (en)

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JPH04272771A (en) 1992-09-29
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CA2056904A1 (en) 1992-06-06
EP0489516A1 (en) 1992-06-10
GB2250599B (en) 1994-08-24
IE70329B1 (en) 1996-11-13
EP0489516B1 (en) 1995-06-07
GB9124714D0 (en) 1992-01-15
AU646517B2 (en) 1994-02-24
GB9026403D0 (en) 1991-01-23
IL100142A0 (en) 1992-08-18
US5218970A (en) 1993-06-15
AU8820991A (en) 1992-06-11
IL100142A (en) 1995-12-08
DE69110255T2 (en) 1995-10-12

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