DE202009012488U1 - Light detector and light source - Google Patents

Light detector and light source

Info

Publication number
DE202009012488U1
DE202009012488U1 DE202009012488U DE202009012488U DE202009012488U1 DE 202009012488 U1 DE202009012488 U1 DE 202009012488U1 DE 202009012488 U DE202009012488 U DE 202009012488U DE 202009012488 U DE202009012488 U DE 202009012488U DE 202009012488 U1 DE202009012488 U1 DE 202009012488U1
Authority
DE
Germany
Prior art keywords
element
light source
light
characterized
light detector
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.)
Expired - Lifetime
Application number
DE202009012488U
Other languages
German (de)
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.)
Envitec Wismar GmbH
Original Assignee
Envitec Wismar GmbH
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 Envitec Wismar GmbH filed Critical Envitec Wismar GmbH
Priority to DE202009012488U priority Critical patent/DE202009012488U1/en
Publication of DE202009012488U1 publication Critical patent/DE202009012488U1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/145Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A61B5/14551Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
    • A61B5/14552Details of sensors specially adapted therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064Constructional details of the endoscope body
    • A61B1/0011Manufacturing of endoscope parts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/04Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
    • A61B1/05Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances characterised by the image sensor, e.g. camera, being in the distal end portion
    • A61B1/051Details of CCD assembly
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661Endoscope light sources
    • A61B1/0676Endoscope light sources at distal tip of an endoscope
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/12Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with cooling or rinsing arrangements
    • A61B1/128Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with cooling or rinsing arrangements provided with means for regulating temperature
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/12Manufacturing methods specially adapted for producing sensors for in-vivo measurements
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/24Hygienic packaging for medical sensors; Maintaining apparatus for sensor hygiene
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/0059Detecting, measuring or recording for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radiowaves
    • A61B5/055Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radiowaves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00Features of devices classified in G01N21/00
    • G01N2201/02Mechanical
    • G01N2201/022Casings
    • G01N2201/0228Moulded parts

Abstract

Light detector or light source, comprising a receiving optical system (1) or a transmitting optical system (2) with a receiving element (1.3) or a transmitting element (2.3) for the detection or emission of light and an optically transparent potting body (1.6, 2.6), characterized an elastic and optically transparent intermediate layer (1.5, 2.5) is arranged between receiving element (1.3) or transmitting element (2.3) and potting body (1.6, 2.6).

Description

  • The vorliege invention relates to a light detector and a light source, comprising a receiving optical system or a transmitting optical system with a receiving element or a transmitting element for detection or transmission of light and an optically transparent potting body. The invention further relates to sensors comprising at least one of these light detectors or one of these light sources. Appropriate sensors are suitable for use as medical sensors, for example the non-invasive measurement of oxygen saturation in the blood.
  • The measurement of oxygen saturation in the blood is a widely used method in medicine, such a measurement being carried out non-invasively in the majority of cases by means of a pulse oximeter. A pulse oximeter usually consists of a clip-like housing with a recess into which, for example, the finger, toe, earlobe or other perfused tissue of a person can be inserted. In the surface of the recess there is a light source, which is opposite to a likewise located in the surface of the recess detector in such a way that the blood perfused tissue between the light source and the detector is located. The light source, usually an LED, emits light of only two different wavelengths, for example, 660 nm and 940 nm. The perfused, perfused tissue absorbs a portion of the light, the light transmission being inversely proportional to the concentration of hemoglobin. The light source and the detector form the sensor element of the pulse oximeter. A corresponding device is for example in EP-A-1 168 959 described.
  • Of the Detector, usually a photodetector, receives the transmitted light and converts this into electrical signals around. The electrical signals are transmitted by means of electrical conductors, which are formed in the housing, via a Transporting the connection cable to an evaluation unit. To this end has the cable on a connector, which in a corresponding Connection element can be inserted in the evaluation unit, so that an electrical connection between the detector and the Evaluation unit is produced. On the other hand, by the cable electrical conductor for the energy supply of the light source and the detector.
  • It is medical standard, medical devices regularly to sterilize, as far as possible sterility to ensure the devices. It is now common practice to perform the sterilization by autoclaving. For this purpose, the device to be sterilized in an autoclave and typically there for about 2 to 20 minutes or even longer at a temperature of 115 ° C to 140 ° C and a Pressure of about 2 bar exposed to saturated water vapor.
  • As a rule, medical devices consist of a plurality of individual elements which are coupled in a variety of different ways, such as mechanical, electrical, optical, magnetic, etc., and / or combinations thereof, and which are in operative connection with each other. In particular, mechanically separable connections are required in order to be able to uncouple elements of the medical device which are not sterilizable and to subject them to a sterilization process other than autoclaving. Accordingly, in DE 91 02 784 U1 Coupling elements proposed by means of which a temperature sensor can be separated from the connection cable, whereby an autoclaving of the temperature sensor is made possible. The connection cable itself is either not sterilized or subjected to a simple wiping sterilization.
  • to sufficiently safe sterilization of the above-described Pulse oxymeter thus needs the connecting cable first be disconnected from the evaluation unit by the connector is pulled out of the connection unit of the evaluation device. Subsequently be the case, the light source and the detector comprehensive sensor, the connection cable and the connector, which are coherently connected and the real one Measuring device for determining the oxygen saturation of blood form, separated from each other, leaving four individual elements housing, sensor, cable and connector. The Decomposition into these individual elements is required as certain Individual elements (such as the connection cable and the Sensor) can not be subjected to autoclaving or at least the slipping over of a hollow body, which consists of a high temperature resistant plastic require. By means of the hollow body to damage of the single element during autoclaving by overheating be prevented. If a single element can not be autoclaved, so another sterilization process must be used.
  • In addition, conventional devices for measuring the oxygen saturation in the blood can not be autoclaved as a piece, since the high pressure of about 2 bar easily penetrate water vapor in the electronic components and thereby destroy the device. Another problem is that the required optical semiconductor components, which usually comprise a LED as a sensor and a receiver as a Si photodiode, are often not sufficiently temperature-resistant to the high temperatures in the autoclave to withstand.
  • The problems encountered in the disassembly of the meter have already been overcome by a device such as that described in US Pat WO 2009/0019044 is disclosed. This document also suggests improvements to the optical semiconductor devices to withstand the high autoclaving temperatures.
  • It would be desirable, the pressure and temperature resistance the semiconductor devices continue to increase the life these elements and thus the overall device over a increase the number of autoclaving cycles.
  • It has now been found that despite the application of the semiconductor layers on temperature and pressure resistant support elements and despite encapsulating the components in optically transparent Potting body in particular the light detectors after only 20 autoclaving cycles can fail. This problem could also by the selection of materials similar to the contact surfaces Have thermal expansion coefficient, not complete be solved. Surprisingly, it has now been found that the life of corresponding light detectors and light sources significantly extended with respect to the autoclaving cycles can be, if between receiving element or transmitting element and the Potting a elastic and optically transparent Intermediate layer is arranged.
  • The The present invention thus relates to a light detector or a Light source, comprising a receiving optics or transmission optics with a receiving element or a transmitting element for the detection or emitting light and an optically transmissive one Potting body, characterized in that between the Receiving element or the transmitting element and the potting a arranged elastic and optically transparent intermediate layer is.
  • By the arrangement of the elastic intermediate layer between receiving or transmitting element increases the life of the light detector or the light source of about 20 autoclaving cycles to a multiple on autoclaving cycles.
  • The elastic and optically permeable intermediate layer is different from the optically permeable potting in that the material of the intermediate layer in contrast to Material of the potting body is more elastic. The material of the Potting body has in contrast plastic properties on.
  • Preferably the material of the elastic intermediate layer has a Shore A. Hardness ≤ 70, in particular ≤ 50 and more preferably a Shore A hardness of about 40. In contrast the material of the potting body preferably has a Shore D. Hardness of> 70 on, preferably of> 80 and preferably in the range of 80-90.
  • In an embodiment of the present invention is the elastic and optically permeable intermediate layer an elastomer, preferably made of silicone. Preferably This silicone elastomer has a surface hardness in the range of 30 to 50 Shore-A, in particular of about 40 Shore-A. The silicone elastomer should have a wide temperature range be chemically and physically stable and elastic, preferably in a temperature range of -50 ° C to 200 ° C.
  • The elastic and optically permeable intermediate layer covers the receiving element of the light detector or the transmitting element of Light source preferably over the entire surface. Both at the Receive as well as the transmitting element is usually around a semiconductor device. The intermediate layer thus forms a Layer on the semiconductor device and protects it Thus, against the transfer of pressures on act on the potting body from the outside. simultaneously the intermediate layer reduces the occurrence of material stresses between receiving or transmitting element and potting. Since these voltages are greater, the larger the contact surface between receiving or transmitting element and potting body, the problems are related the lack of life of light detector and light source increases on large-scale elements. Accordingly affects the inventive elastic and optically transparent intermediate layer especially in the Light detectors advantageous on their life, since the Receiving elements located therein are usually larger Have surface, as the transmitting elements in the light sources. Accordingly, in the invention also claimed sensors of light source and light detector, for example Light detectors according to the invention, the elastic and have optically transparent intermediate layer, with not Light sources according to the invention without elastic Intermediate layer can be combined, provided the transmitting elements in the light sources are so small that the light sources even without The elastic intermediate layer has a long service life have the autoclaving cycles.
  • Both light detector and light source may each have one or more receiving elements or transmitting elements. Usually, a light detector according to the invention has a receiving element, whereas a erfindungsge appropriate light source can have two or more transmitting elements. If the light detector or the light source has more than one receiving element or a transmitting element, preferably each of these elements has the elastic and optically transparent intermediate layer.
  • Around the light detector or the light source effectively against the Autoclaving occurring high pressures and temperatures to protect while maintaining a fast and even temperature distribution within the light detector or to ensure the light source have these in one embodiment of the present invention Invention via a carrier element, which consists of a ceramic material is formed. In this case, the receiving element or the transmitting element by means of an electrically conductive mask attached to the support element and the receiving element or the transmitting element are electrically conductive by means of a bonding wire connected to the mask. The ceramic material of the carrier element provides a quick and even adaptation the temperature within the light detector or the light source to the rapidly changing outdoor temperature during autoclaving for sure. As a result, mechanical stresses between the individual Components additionally reduced and thus the life of Light detector and light source additionally increased.
  • In a further embodiment of the invention Light detector or the light source according to the invention the carrier element has a bright, preferably light-reflecting Paint on. It has been shown that thereby the light output and thus ultimately the accuracy of measurement of the sensors according to the invention Light detectors and light sources are increased can. The carrier material can either with a corresponding color, such as white, are coated or, preferably, comprises the ceramic material of the carrier element even a light color, such as white, on.
  • In another embodiment of the present invention is a reflector element applied to the carrier element, this is the unit of electrically conductive mask, receiving element or transmitting element, bonding wire, intermediate layer and potting bounded sideways. Preferably, the reflector element limits the said parts on the support element fully circumferential. For example, the reflector element may be a ring, act a square or a rectangle that covers those parts The support element laterally limited. The reflector element can be formed integrally with the carrier element be or be attached to this example by gluing. The Reflector element may also be formed of a ceramic material be, for example, from the same material as the carrier element.
  • Preferably Also, the reflector element has a bright, especially light-reflecting Paint on. For example, carrier element and reflector element be provided with the same color or from consist of the same bright ceramic material.
  • The annular or angular trained support element represents the outer boundary for the optically transparent potting body. The potting Accordingly, preferably fill the remaining space between carrier element and reflector element and closes flush with the reflector element. The light detector or the light source can accordingly be made by that first the electrically conductive mask on the support element is applied, then the receiving element or the transmitting element is applied to the electrically conductive mask, the receiving element or the transmitting element by means of the bonding wire with the electric conductive mask is connected, the elastic and optically permeable Intermediate layer applied to the receiving element or the transmitting element and finally the remaining space between the support element and the reflector element completely with the optically transparent Pouring body is filled.
  • Of the Optically transparent potting body is preferably from one to at least about 150 ° C heat resistant and up to at least about 2 bar steam stable, water vapor impermeable Material, for example made of an epoxy resin. The potting body thus acts primarily as a water vapor barrier, to prevent penetration hot water vapor during autoclaving in the light detector or to prevent the light source.
  • Preferably the materials of the individual components are chosen each adjoining element is thermally compatible are, d. h., that the thermal expansion coefficients of the materials are similar, in particular are approximately the same, so that it as possible low mechanical stresses between the individual elements comes.
  • In a preferred embodiment of the present invention, the elastic and optically transmissive intermediate layer does not reach the reflector element. In particular, the intermediate layer should not protrude laterally beyond the receiving element or the transmitting element, so that the intermediate layer covers the receiving element or the transmitting element over the entire surface, but at the same time has no contact with other materials than the potting body and in particular does not reach as far as the reflector element. It has namely, pointed out that a contact between the elastic and optically transparent intermediate layer and the reflector element favors the penetration of water vapor in the electrically conductive components. This adversely affects the life of the light detector or light source with respect to the autoclaving cycles.
  • After all The present invention also relates to a sensor which is at least a light detector according to the invention and / or comprises at least one light source according to the invention. In particular, the sensor preferably comprises at least one invention Light detector. Because the light source due to the smaller surface the transmitting elements usually heat and pressure resistant is, not according to the invention Light sources together with a light detector according to the invention be combined in the sensor.
  • Of the Sensor according to the invention is usually as medical-safe sensor used. The sensor is suitable, for example for measuring the oxygen saturation in the blood, for measurement of blood sugar or for use in endoscopy.
  • The adjoining 1 shows a cross section through a light detector according to the invention.
  • The adjoining 2 shows a cross section through a light source according to the invention.
  • 1 shows a light detector according to the invention with a receiving optics ( 1 ). The receiving optics ( 1 ) comprises a receiving element ( 1.3 ), for example a semiconductor element, for the detection of light. The receiving element ( 1.3 ) is on an electrically conductive mask ( 1.2 ) and with this electrically conductive with a bonding wire ( 1.4 ) connected. The electrically conductive mask ( 1.2 ) is on a support element ( 1.1 ) arranged. The receiving element ( 1.3 ) is completely covered by an elastic and optically transparent intermediate layer ( 1.5 ).
  • The assembly of electrically conductive mask ( 1.2 ), Receiving element ( 1.3 ) with bonding wire ( 1.4 ) and elastic, optically permeable intermediate layer ( 1.5 ) is replaced by a reflector element ( 1.7 ) bounded sideways and enclosed. The remaining space within the reflector element is provided with a potting body ( 1.6 ), wherein the potting body ( 1.6 ) flush with the reflector element ( 1.7 ) completes.
  • 2 shows a light source according to the invention, consisting of two transmitting elements ( 2.3 ), in particular semiconductor elements, which are connected by means of bonding wires ( 2.4 ) electrically conductive with an electrically conductive mask ( 2.2 ) are connected. This is located on a support element ( 2.1 ). The reflector element ( 2.7 ) limits the individual components sideways, wherein the remaining space of the potting body ( 2.6 ) is filled out. The elastic and optically transparent intermediate layer ( 2.5 ) is applied to the transmitting elements ( 2.3 ) applied flat.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - EP 1168959 A [0002]
    • - DE 9102784 U1 [0005]
    • - WO 2009/0019044 [0008]

Claims (17)

  1. Light detector or light source, comprising a receiving optics ( 1 ) or a transmission optics ( 2 ) with a receiving element ( 1.3 ) or a transmitting element ( 2.3 ) for the detection or emission of light and an optically permeable potting body ( 1.6 . 2.6 ), characterized in that between receiving element ( 1.3 ) or transmitting element ( 2.3 ) and potting body ( 1.6 . 2.6 ) an elastic and optically transparent intermediate layer ( 1.5 . 2.5 ) is arranged.
  2. Light detector or light source according to claim 1, characterized in that the intermediate layer ( 1.5 . 2.5 ) is formed of a silicone elastomer.
  3. Light detector or light source according to one of the preceding claims, characterized in that the intermediate layer ( 1.5 . 2.5 ) the receiving element ( 1.3 ) or the transmitting element ( 2.3 ) covers the entire surface.
  4. Light detector or light source according to one of the preceding claims, wherein the receiving element ( 1.3 ) or the transmitting element ( 2.3 ) by means of an electrically conductive mask ( 1.2 . 2.2 ) on a carrier element ( 1.1 . 2.1 ) and the receiving element ( 1.3 ) or the transmitting element ( 2.3 ) by means of a bonding wire ( 1.4 . 2.4 ) electrically conductive with the mask ( 1.2 . 2.2 ), characterized in that the carrier element ( 1.1 . 2.1 ) is formed of a ceramic material.
  5. Light detector or light source according to claim 4, characterized in that the carrier element ( 1.1 . 2.1 ) has a bright, preferably light-reflecting color.
  6. Light detector or light source according to one of claims 4 or 5, characterized in that on the carrier element ( 1.1 . 2.1 ) a reflector element ( 1.7 . 2.7 ) is applied, the unit of electrically conductive mask ( 1.2 . 2.2 ), Receiving element ( 1.3 ) or transmitting element ( 2.3 ), Bonding wire ( 1.4 . 2.4 ), Intermediate layer ( 1.5 . 2.5 ) and potting body ( 1.6 . 2.6 ) bounded sideways.
  7. Light detector or light source according to claim 6, characterized in that the reflector element ( 1.7 . 2.7 ) has a bright, preferably light-reflecting color.
  8. Light detector or light source according to one of claims 6 or 7, characterized in that the potting body ( 1.6 . 2.6 ) the remaining space between the support element ( 1.1 . 2.1 ) and reflector element ( 1.7 . 2.7 ) and flush with the reflector element ( 1.7 . 2.7 ) completes.
  9. Light detector or light source according to one of the preceding claims, characterized in that the potting body ( 1.6 . 2.6 ) is formed of a heat-resistant up to at least about 150 ° C and up to at least about 2 bar vapor pressure stable, water vapor impermeable material.
  10. Light detector or light source according to claim 9, characterized in that the potting body ( 1.6 . 2.6 ) is formed of an epoxy resin.
  11. Light detector or light source according to one of claims 6 to 10, characterized in that the intermediate layer ( 1.5 . 2.5 ) not to the reflector element ( 1.7 . 2.7 ).
  12. Light detector or light source according to claim 11, characterized in that the intermediate layer ( 1.5 . 2.5 ) not via the receiving element ( 1.3 ) or the transmitting element ( 2.3 ) protrudes sideways.
  13. Sensor comprising at least one light detector and / or at least one light source according to one of the claims 1 to 12.
  14. Sensor according to claim 13 for use as medical sensor.
  15. Sensor according to claim 14 for measurement the oxygen saturation in the blood.
  16. Sensor according to claim 14 for measuring the Blood sugar.
  17. Sensor according to claim 14 for use in endoscopy.
DE202009012488U 2009-09-15 2009-09-15 Light detector and light source Expired - Lifetime DE202009012488U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE202009012488U DE202009012488U1 (en) 2009-09-15 2009-09-15 Light detector and light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202009012488U DE202009012488U1 (en) 2009-09-15 2009-09-15 Light detector and light source

Publications (1)

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DE202009012488U1 true DE202009012488U1 (en) 2010-04-08

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DE (1) DE202009012488U1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9102784U1 (en) 1991-03-08 1991-05-29 Kendall Medizinische Erzeugnisse Gmbh, 8425 Neustadt, De
EP1168959A1 (en) 1999-04-14 2002-01-09 Mallinckrodt Inc. Method and circuit for indicating quality and accuracy of physiological measurements
WO2009019044A2 (en) 2007-11-09 2009-02-12 Envitec-Wismar Gmbh Apparatus for measuring blood oxygen saturation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9102784U1 (en) 1991-03-08 1991-05-29 Kendall Medizinische Erzeugnisse Gmbh, 8425 Neustadt, De
EP1168959A1 (en) 1999-04-14 2002-01-09 Mallinckrodt Inc. Method and circuit for indicating quality and accuracy of physiological measurements
WO2009019044A2 (en) 2007-11-09 2009-02-12 Envitec-Wismar Gmbh Apparatus for measuring blood oxygen saturation

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Effective date: 20100512

R150 Term of protection extended to 6 years
R150 Term of protection extended to 6 years

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R151 Term of protection extended to 8 years
R152 Term of protection extended to 10 years
R071 Expiry of right