Abstract:
A probe (10) adapted for direct insertion into the tissue of a patient, includes a needle (21) having walls defining an interior lumen (38) and a closed tip with a generally conical configuration. At least one sensor (14) capable of measuring a particular physiological parameter is disposed in the lumen. At least one window (41) is formed in the needle wall (36) along a path between the tissue and the sensor. A filler material (52) disposed along the path inhibits the passage of air or blood while facilitating transmission of the particular physiological parameter of interest such as oxygen, carbon dioxide, pH, and pressure.
Abstract:
An optical probe (100) which is particularly suited to reduce noise in measruements taken on an easily compressible material, such as a finger, a toe, a forehead, an earlobe, or a lip. The probe includes a base (110) having an aperture (120) which leads to a chamber (122). The base is placed adjacent a portion of the material, the chamber being placed directly adjacent any easily compressible portion of the material. A photodetector (126) is located within the chamber and does not contact the material. A light emitting diode (LED) (130) is affixed to the material, opposite the photodetector and above the chamber. The material which is supported by the aperture and therefore rests above or has intruded into the chamber is inhibited from compression since nothing comes in contact with this portion of the material, even when the material moves. Thus, light from the LED is directed through a stabilized portion of the material, such that the optical path length through which light travels is stabilized.
Abstract:
The invention calls for a TV set (1) to be equipped and modified for the display of data indicating the functioning of the human body, at least one measurement device (2) for the measurement of such data, in particular a measurement device for monitoring the functioning of the cardiovascular system, being associated with the TV set (1) and the data from the measurement device being transmitted to the TV set (1) and optionally displayed on the screen (3) of the TV set (1).
Abstract:
To be used with a double-ended needle assembly and to prevent the accidental pricking of a user, or others, in a first embodiment of the present invention, a contain holder (2) mated with the needle assembly has a protective housing (18) integrally and flexibly connected thereto. To prevent a contaminated needle (22) from posing a risk to the user and others, the housing (18), connected to the container holder (2), is pivoted into alignment with the contaminated needle (22) such that the needle is retained by at least one locking mechanism (44, 46) integral of the housing (18). The container holder (2), along with the contaminated needle assembly, can then be disposed of. If the container holder (2) were to be reused, a second embodiment of the present invention provides for the connection of a protective housing (18) to the hub (62) of a double-ended needle assembly (64). For this embodiment, after use, the contaminated needle assembly (64) after having been properly retained in the protective housing (18) is removed from the reusable container housing (2) and disposed of.
Abstract:
The invention relates to method and sensor for detecting specific parameters of a blood flow in a blood vessel in a living organism by detecting optical properties of the flowing blood, depending on said specific parameter, by using at least one optical plastic or glass fibre. The detection is effected according to the invention in a peripheral layer of blood plasma closest to the wall of the blood vessel the optical fiber being disposed adjacent said wall at the outside or inside surface thereof. The sensor comprises means (10) for applying one or more optical plastic or glass fibres (14, 15) to the outside surface of the wall of the blood vessel (11).
Abstract:
An outer catheter so sized and configured so as to extend from a point below the first bifurcation of the trachea through the upper respiratory system of the patient is disposed about an inner catheter having a tip secured in the opening at the distal end thereof with an outer lateral periphery larger in diameter than the outer surface of the inner catheter. A passageway is formed between said outer catheter and said inner catheter. A connector hub assembly, connected to the proximal end of the outer catheter and couplable to a supply of oxygen, allows for oxygen insufflation to take place during the bronchoalveolar lavage procedure. The proximal surface of the tip between the outer lateral periphery and the outer surface of the inner catheter is capable of sealingly engaging the distal end of the outer catheter. In this condition the pair of catheters can be advanced through the upper respiratory system of the patient without contaminating the outer surface of the inner catheter. Thereafter the inner catheter is advanced relative to the outer catheter into a wedging position in a bronchiole of the patient. In one embodiment, the inner catheter is provided with a selectively inflatable cuff by which to engage the walls of a bronchiole of the patient.
Abstract:
A luminescence-based integrated optical (11) and electronic system (29, 37, 51, 55, 59) for measuring temperature or some other parameter from the decay time of a luminescent sensor (25) is disclosed. A high bandwidth, low noise amplifier (31) applies a detected decaying luminescent signal to a digital system (29, 37, 51) that acquires that signal and processes it in order to determine its decay time characteristics that are related to temperature or another parameter being measured. The digital signal processing includes use of a digital curve-fitting technique. A preferred luminescent material for temperature measurement is a chromium-doped yttrium gallium garnet material. The entire optical and electronic portions of the measuring system can be accommodated on a small single circuit card (131).
Abstract:
A finger receptor is used with a non-invasive monitoring device to determine non-invasively the concentration of known constituents in blood or tissue. The receptor has a channel for receiving a finger of a user. The channel has a light entrance and a light exit so that light can be passed from a light source through a finger located in the channel in a direction generally normal to the finger. Extraneous light is excluded and the finger is held in position by a spring-mounted roller. The receptor has sensing means to determine when a finger has been properly positioned in the channel. Previous devices are not capable of achieving repeatable results to a sufficient degree to replace invasive methods of testing.
Abstract:
The concentration of a substance, especially glucose, in the blood is measured in vivo by applying to the skin two wavelengths of infrared light and measuring the difference in the absorption of the two wavelengths, preferably in the range of 3-10 mu m, one being a sample wavelength at which the substance shows a specific absorption and the other being a reference wavelength at which the substance shows no specific absorption. Simultaneously the concentrations of interfering components are measured in the same way and the result for the substance is corrected with regard to the measured concentrations of interfering components. Infrared light is transmitted through optical fibres (10, 10a) to a detector having two chambers (15, 15a), a sample wavelength to one chamber (15) and a reference wavelength to the other (15a), and a transducer (14) between the chambers measures the difference in the pressures induced in the respective chambers when the tissue beneath the chambers is heated by absorption of the infrared light transmitted to it.
Abstract:
A method for distinguishing between a full thickness and a partial thickness skin burn in a patient having a skin burn. The method includes administering a fluorescent compound, which is excited by infrared light, to the patient to cause the compound to enter one or more capillaries below and adjacent the skin burn. The compound is then excited with infrared light, and the amount of fluorescence of the compound caused by the infrared light detected at the skin burn and at unburned skin adjacent the skin burn. The ratio of fluorescence detected at the skin burn and at the unburned skin is an indication of the thickness of the skin burn, e.g., a ratio of less than 0.4 indicates a full thickness skin burn.