CN205234511U - Blood oxygen tester - Google Patents
Blood oxygen tester Download PDFInfo
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- CN205234511U CN205234511U CN201520962492.2U CN201520962492U CN205234511U CN 205234511 U CN205234511 U CN 205234511U CN 201520962492 U CN201520962492 U CN 201520962492U CN 205234511 U CN205234511 U CN 205234511U
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- blood oxygen
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- oxygen probe
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Abstract
The utility model relates to a blood oxygen tester belongs to medical instrument technical field. This tester includes blood oxygen probe, control blood oxygen probe's front end circuit and main control chip, the front end circuit is including the detection module who establishes ties in proper order, enlarged module, filter module, analog -to -digital conversion module and digital filter module, still include the control unit and LED drive unit, blood oxygen probe's output is connected to detection module's input, the input of the output connection control unit of digital filtering module, LED drive unit is connected to the control unit's output, blood oxygen probe's input is connected to LED drive unit's output, the control unit's connection main control chip and communication with it. The utility model provides a blood oxygen tester to digital integrated circuit design forms, and its circuit structure is simple, a little less than receiving external electromagnetic interference and environmental impact, temperature drift is little, under various extreme conditions, can not influence the test result. Do not need unnecessary hardware debugging during production, simplify the production procedure.
Description
Technical field
The utility model relates to a kind of blood oxygen tester, belongs to technical field of medical instruments.
Background technology
Various blood oxygen testing equipments in the market, its front-end circuit is substantially all the analog circuit scheme that adopts separate design, its spread in performance is uneven. Be Analog Circuit Design complexity, debug difficulties, is affected by the external environment large, lack of wisdom control function at all.
Summary of the invention
The technical problems to be solved in the utility model is, overcomes the shortcoming of prior art, proposes a kind of blood oxygen tester that adopts set of digits accepted way of doing sth front-end circuit.
The utility model is that the technical scheme that solves the problems of the technologies described above proposition is: a kind of blood oxygen tester, comprising: blood oxygen probe, the front-end circuit of controlling described blood oxygen probe and main control chip; Described front-end circuit comprises detection module, amplification module, filtration module, analog-to-digital conversion module and the digital filtering module of series connection successively; Also comprise control module and LED driver element; The input of described detection module connects the output of described blood oxygen probe; The output of described digital filtering module connects the input of described control module; The output of described control module connects described LED driver element; The output of described LED driver element connects the input of described blood oxygen probe; The described main control chip of connection of described control module communication with it.
Such scheme further improves and is: between described LED driver element and described control module, be in series with D/A converter module.
Such scheme further improves and is: described front-end circuit is integrated circuit AFE4490.
The blood oxygen tester that the utility model provides, forms with digitized IC design, and its circuit structure is simple; A little less than being subject to outside electromagnetic interference and ambient influnence, temperature drift is little, under various extreme conditions, can not affect test result. When production, do not need unnecessary hardware debug, simplify production procedure.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is the electrical block diagram of a preferred embodiment of the utility model.
Detailed description of the invention
Embodiment
The blood oxygen tester of the present embodiment, as shown in Figure 1, comprising: front-end circuit and the MCU of blood oxygen probe, control blood oxygen probe; Front-end circuit comprises detection module, amplification module, filtration module, analog-to-digital conversion module and the digital filtering module of series connection successively; Also comprise control module and LED driver element; The input of detection module connects the output of blood oxygen probe; The input of the output connection control unit of digital filtering module; The output of control module connects LED driver element; The output of LED driver element connects the input of blood oxygen probe; The connection MCU of control module communication with it.
Between LED driver element and control module, be in series with D/A converter module.
The front-end circuit of the present embodiment adopts the AFE(analog front end) integrated circuit AFE4490 of TI.
The working method of the present embodiment is as follows: MCU detects AFE4490 duty after initializing in real time. Detect blood oxygen probe featured resistance by detection module, judge whether probe inserts and select corresponding probe blood oxygen indicatrix; When finger inserts, gather pulse wave signal by infrared light, regulate LED drive current (LED drive current one is divided into 8 grades, is respectively 2ma/5ma/15ma/45ma/50ma/55ma/60ma/70ma) according to signal strength signal intensity intelligence, make signal reach suitable amplitude, improve acquisition precision; Can regulate the size of feedback resistance in amplification module, change gain, reach same effect simultaneously; Signal after filtering module carries out LPF, filtering High-frequency Interference; Then by analog-to-digital conversion module, analog signal is changed into data signal, and carry out digital power frequency filtering by digital filtering module, further remove electromagnetic interference and noise, extract useful signal; Beat detector checks complete periodic signal, for algorithm computing, obtains useful blood oxygen saturation and pulse frequency value.
The utility model is not limited to the various embodiments described above, and all employings are equal to replaces the technical scheme forming, and all drops on the protection domain of the utility model requirement.
Claims (3)
1. a blood oxygen tester, is characterized in that, comprising: blood oxygen probe, the front-end circuit of controlling described blood oxygen probe and main control chip; Described front-end circuit comprises detection module, amplification module, filtration module, analog-to-digital conversion module and the digital filtering module of series connection successively; Also comprise control module and LED driver element; The input of described detection module connects the output of described blood oxygen probe; The output of described digital filtering module connects the input of described control module; The output of described control module connects described LED driver element; The output of described LED driver element connects the input of described blood oxygen probe; The described main control chip of connection of described control module communication with it.
2. blood oxygen tester according to claim 1, is characterized in that: between described LED driver element and described control module, be in series with D/A converter module.
3. blood oxygen tester according to claim 1, is characterized in that: described front-end circuit is integrated circuit AFE4490.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520962492.2U CN205234511U (en) | 2015-11-26 | 2015-11-26 | Blood oxygen tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520962492.2U CN205234511U (en) | 2015-11-26 | 2015-11-26 | Blood oxygen tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205234511U true CN205234511U (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520962492.2U Active CN205234511U (en) | 2015-11-26 | 2015-11-26 | Blood oxygen tester |
Country Status (1)
| Country | Link |
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| CN (1) | CN205234511U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106344040A (en) * | 2016-10-20 | 2017-01-25 | 天津大学 | Measuring device and measuring method for raised level square wave modulation photoelectric volume pulse wave |
| CN106361291A (en) * | 2016-10-20 | 2017-02-01 | 天津大学 | Preset level raised orthogonal sine wave frequency encoding hyperspectral imaging system |
| CN114052682A (en) * | 2021-12-14 | 2022-02-18 | 重庆科技学院 | Physiological parameter monitoring system based on raspberry group |
-
2015
- 2015-11-26 CN CN201520962492.2U patent/CN205234511U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106344040A (en) * | 2016-10-20 | 2017-01-25 | 天津大学 | Measuring device and measuring method for raised level square wave modulation photoelectric volume pulse wave |
| CN106361291A (en) * | 2016-10-20 | 2017-02-01 | 天津大学 | Preset level raised orthogonal sine wave frequency encoding hyperspectral imaging system |
| CN114052682A (en) * | 2021-12-14 | 2022-02-18 | 重庆科技学院 | Physiological parameter monitoring system based on raspberry group |
| CN114052682B (en) * | 2021-12-14 | 2023-10-24 | 重庆科技学院 | Physiological parameter monitoring system based on raspberry group |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Xiaodong Inventor after: Yang Haofang Inventor after: Hu Jisong Inventor after: Jin Xiaofeng Inventor after: Guan Zhichao Inventor before: Wang Xiaodong Inventor before: Yang Haofang Inventor before: Hu Jisong Inventor before: Kong Lele |
|
| COR | Change of bibliographic data |