CN105287187B - A kind of instrument formula CPR compression depth algorithm - Google Patents
A kind of instrument formula CPR compression depth algorithm Download PDFInfo
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- CN105287187B CN105287187B CN201510608411.3A CN201510608411A CN105287187B CN 105287187 B CN105287187 B CN 105287187B CN 201510608411 A CN201510608411 A CN 201510608411A CN 105287187 B CN105287187 B CN 105287187B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H31/00—Artificial respiration or heart stimulation, e.g. heart massage
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/50—Control means thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/50—Control means thereof
- A61H2201/5058—Sensors or detectors
- A61H2201/5061—Force sensors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
- A61H2201/50—Control means thereof
- A61H2201/5058—Sensors or detectors
- A61H2201/5064—Position sensors
Abstract
The invention discloses a kind of instrument formula CPR compression depth algorithms comprising following steps：The acquisition of initial data；Remove acceleration singular value；Slipping smoothness filters；Choose pressing starting point, pressing maximum point, the corresponding acceleration value of pressing end point；It takes single hop to carry out quadratic integral to acceleration, obtains the displacement of X, Y, Z axis respectively；The displacement of X, Y-axis is projected on Z axis, the sinking displacement value of the according to pressing depth value and back at shirtfront is calculated separately out；According to pressing depth value subtracts back sinking displacement value and can be obtained actual grade value to chest compression for shirtfront.The instrument formula CPR compression depth algorithm of the present invention can real-time and accurately reflect the actual pressing depth of torso model the piston rod of instrument formula CPR CPR equipment, ensure effectively according to pressing depth " no less than 5 centimetres " in first aid procedures, and algorithm is simple and practical, scientific and efficient, can improve first aid quality.
Description
Technical field
The present invention relates to medical first aid technical fields, more particularly to a kind of instrument formula CPR compression depth algorithm.
Background technology
In medical first aid, it is also maximally efficient first-aid method that CPR technology, which is most common,.Experiment shows in reality
During applying chest compression, the depth and frequency of pressing directly determine first aid success or not, therefore, newest revision《2010
American Heart Association (AHA) CPR (CPR) and emergency cardiovascular care (ECC) guide》Middle regulation, compression frequency at least want 100
Beat/min, according to pressing depth at least want 5 centimetres.
Traditional first aid procedures using artificial pressing, according to pressing depth then by the live relief experience of rescuer, press
The factors such as surging determine.It is more demanding to the constitution of rescue personnel in the push action of first aid procedures high frequency, high intensity,
Once rescue personnel's is short of physical strength, then compression frequency and according to pressing depth it is difficult to ensure that, and then directly affect success in salvage.And
During artificial relief, rescuer excessively presses patient harm in order to prevent, often can not fully press, result is sued and laboured
Guidelines are according to pressing depth not achieved, effect of suing and labouring is poor.
In consideration of it, more and more instrument formula (electric and pneumatic etc.) CPR CPR equipment are developed, instrument formula
According to pressing depth being realized by controlling the ejection length of press head (piston rod end) for CPR CPR equipment, presets work
After the ejection length of stopper rod, i.e., acquiescence sue and labour process to shirtfront according to pressing depth be setting value.In fact, due to human body back ridge
Vertebra has certain curvature, and the position majority lain of patient is flexible support object (such as soft bed, cushion), and rescuer is from patient
When chest presses down on, the entire thoracic cavity of patient (shirtfront and back) first can move downward or deform under the effect of the pressure a spacing
From after waiting patients back to obtain effectively support, the lower pressure of rescuer can just be such that shirtfront deforms downwards, namely proceed by cardiopulmonary
Recovery acts.Therefore, during actually suing and labouring, initial one end time of push action does not play the effect in compressing thoracic cavity,
Although setting is according to pressing depth 5 centimetres, most of push action is all not achieved 5 centimetres or more, and then to effect of suing and labouring
Fruit causes seriously to adversely affect.
Therefore, it is necessary to which designing a kind of efficient algorithm is applied to instrument formula CPR CPR equipment, applied with accurately reflecting
According to pressing depth value during rescuing.
Invention content
For this purpose, the technical problem to be solved in the present invention overcomes existing instrument formula CPR on present on setting according to pressing depth
Deficiency is stated, and then a kind of algorithm that can accurate, in time, reliably reflect instrument formula CPR compression depth is provided.
To achieve the above object, the present invention uses following technical scheme：
A kind of instrument formula CPR compression depth algorithm comprising following steps：
Step 1：The acquisition of initial data is obtained respectively by the way that the acceleration transducer on human body shirtfront and back is arranged
Take the acceleration value of the acceleration value and back during pressing at shirtfront, and the curve that rendering accelerating angle value changes over time
Figure；
Step 2：The singular value of acceleration value on the graph, collected by acceleration transducer in removal step one
The singular value removal of curve graph is deviated considerably from raw value；
Step 3：Slipping smoothness filters, and the acceleration value that pressing is measured in the process carries out curve graph using filter method
Processing obtains more smooth acceleration plots；
Step 4：Pressing starting point, pressing maximum point, pressing end point pair are chosen from the curve graph obtained in step 3
The acceleration value answered；
Step 5：Single hop is taken to carry out secondary product to acceleration pressing starting point adjacent in step 4 and pressing maximum point
Point, the displacement of X, Y, Z axis is obtained respectively；
Step 6：The displacement of X, Y-axis is projected on Z axis, the according to pressing depth value and back at shirtfront are calculated separately out
Sinking displacement value；
Step 7：By the counted shirtfront of step 6 according to pressing depth value subtract back sinking displacement value can be obtained to thoracic cavity by
The actual grade value of pressure.
Preferably, in above-mentioned steps five, the formula to acceleration quadratic integral is：
WhereinIndicate acceleration；Indicate speed；Indicate displacement；T indicates the time.
Preferably, the smothing filtering in above-mentioned steps three is 5 points of smothing filterings three times.
Preferably, it is added between above-mentioned steps two and step 3 and mean filter is carried out to the acceleration value that step 2 obtains
The step of.
Preferably, the quadratic integral in above-mentioned steps five is all made of trapezoidal method solution.
Preferably, the acceleration transducer described in above-mentioned steps one is 3-axis acceleration sensor.
Beneficial effects of the present invention：
The instrument formula CPR compression depth algorithm of the present invention has been bypassed traditional to be defaulted as pressing by the ejection length of piston rod
The calculation of the non-science of depth, can be real-time and accurately by the piston rod of instrument formula CPR CPR equipment to human body chest
The actual pressing depth of chamber reflects, it is ensured that effectively according to pressing depth " no less than 5 centimetres " in first aid procedures；The chest of the present invention
According to pressing depth algorithm is simple and practical for chamber, and scientific and effective, can in real time reflect in CPR first aid procedures and accurately according to pressing depth count
Value, and then improve first aid efficiency.
Description of the drawings
In order to make the content of the present invention more clearly understood, below in conjunction with the accompanying drawings, the present invention is made further detailed
Thin explanation, wherein：
Fig. 1 is the functional block diagram of the instrument formula CPR compression depth algorithm of the present invention；
Fig. 2 is the initial data for the acceleration that acceleration transducer measures；
Fig. 3 is the acceleration plots removed after singular value；
Fig. 4 is by mean filter method treated acceleration plots；
Fig. 5 is by the acceleration plots after 5 points three times the disposal of gentle filter；
Fig. 6 is that pressing starting point, pressing maximum point, pressing end point are chosen in acceleration plots；
Fig. 7 is pressing process oscillogram, and horizontal axis represents time (unit：10ms), the longitudinal axis represents distance (unit：Decimetre)；
Fig. 8 is the reference chart quadratured using trapezoidal method.
Specific implementation mode
Referring to Fig. 1-6, the horizontal axis in wherein Fig. 2-6 represents time (unit：1/200ms), it is (single to represent acceleration for the longitudinal axis
Position：m/s2).A kind of instrument formula CPR compression depth algorithm comprising following steps：
Step 1：The acquisition of initial data is obtained respectively by the way that the acceleration transducer on human body shirtfront and back is arranged
Take the acceleration value of the acceleration value and back during pressing at shirtfront, and the curve that rendering accelerating angle value changes over time
Figure, referring to Fig. 2；Before carrying out data acquisition, acceleration transducer is calibrated in advance, with improve measure accuracy and
Error rate, the acceleration transducer are 3-axis acceleration sensor, and twin shaft positive and negative 90 may be implemented in 3-axis acceleration sensor
The inclination angle of degree or twin shaft 0-360 degree is 60 by correcting post precision to be higher than double-shaft acceleration sensor more than measurement angle
The case where spending.
Step 2：The singular value of acceleration value on the graph, collected by acceleration transducer in removal step one
The singular value removal of curve graph is deviated considerably from raw value, Fig. 3 is the acceleration plots removed after singular value；
Step 3：In order to keep acceleration plots smoother after the filtering, convenient for improving computational accuracy, step 2 is obtained
Acceleration value curve graph using mean filter method processing optimization, obtain the acceleration plots described in Fig. 4.Mean filter is allusion quotation
The linear filtering algorithm of type, it refers on the image to object pixel to a template, which includes surrounding close on
Pixel (8 pixels, constitute a Filtering Template, that is, remove object pixel itself around centered on target pixel), then use
The average value of entire pixels in template replaces original pixel value.
Step 4：The further slipping smoothness filtering of acceleration plots that step 3 obtains, the smothing filtering is 5 points
Smothing filtering three times, it is shown in Figure 5；
Step 5：Pressing starting point A, pressing maximum point B, pressing end point C are chosen from the curve graph obtained in step 4
Corresponding acceleration value；Referring to Fig. 6,
Press starting point A：It is that (g indicates that the gravity of the earth accelerates to 1g that the acceleration of gravity at starting point A is pressed when keeping flat
Degree)；
Press maximum point B：Referring to Fig. 6, Fig. 7, pressing maximum point B is pressed at maximum displacement, at this time can there are one short
Temporary pressing is kept for stage, i.e. acceleration are restored to a trend of stationary state from lower position, and then pressing rebound starts,
Acceleration is reversely reduced rapidly, and to will appear an inflection point, this inflection point is exactly to press maximum point B.E points in Fig. 7 are also
Press maximum point position.
Press end point C：After pressing, acceleration is restored to baseline position, specifically participates in Fig. 6；
Step 6：Pressing starting point A adjacent in step 5 and pressing maximum point B are taken into single hop (section between 2 points)
Quadratic integral is carried out to acceleration, obtains the displacement of X, Y, Z axis respectively；To the following formula of the use of acceleration quadratic integral：
In order to calculate more accurate displacement, it is preferred to use trapezoidal method, which is asked, integrates acceleration, in conjunction with attached drawing 8,
The specific method is as follows,：
The area approximation of curve is integral, therefore the area that can surround function curve f (x) and reference axis x, y is unlimited
It is refined into numerous trapezoidal, therefore acceleration quadratic integral is at the formula of displacement：
V (i)=V (i-1)+[a (i-1)+a (i)]/2*T
S (i)=S (i-1)+[V (i-1)+V (i)]/2*T
Step 7：The displacement of X, Y-axis is projected on Z axis, the according to pressing depth value and back at shirtfront are calculated separately out
Sinking displacement value；
Step 8：By the counted shirtfront of step 7 according to pressing depth value subtract back sinking displacement value can be obtained to thoracic cavity by
The actual grade value of pressure.
The algorithm to instrument formula CPR compression depth of the present embodiment has been bypassed traditional ejection length by piston rod and has been given tacit consent to
It, can be real-time and accurately by the piston rod pair of instrument formula CPR CPR equipment for the calculation of non-science according to pressing depth
The actual pressing depth of torso model reflects, it is ensured that the according to pressing depth satisfaction in first aid procedures《2010 American Heart Association
(AHA) CPR (CPR) and emergency cardiovascular care (ECC) guide》Defined " no less than 5 centimetres " effectively according to pressing depth, and
The acceleration that need to only obtain shirtfront and back by two acceleration transducers to calculating according to pressing depth of the application
Value, calculating process can be carried out by program prepared in advance or computing module are embedded into first-aid apparatus；Pair of the application
The algorithm of chest compression depth is simple and practical, and scientific and effective, can provide accurate numeric reference for CPR first aid procedures, into
And improve first aid efficiency.
Above-mentioned specific implementation mode is only explained in detail technical scheme of the present invention, the present invention not only only office
Be limited to above-described embodiment, it will be understood by those skilled in the art that it is every according to above-mentioned principle and spirit on the basis of the present invention
It improves, substitute, it all should be within protection scope of the present invention.
Claims (6)
1. a kind of instrument formula CPR compression depth algorithm, it is characterised in that：Include the following steps：
Step 1：The acquisition of initial data obtains press respectively by the way that the acceleration transducer on human body shirtfront and back is arranged
The acceleration value of acceleration value and back during pressure at shirtfront, and rendering accelerating angle value time history plot；
Step 2：The singular value of acceleration value on the graph in removal step one is collected original by acceleration transducer
The singular value removal of curve graph is deviated considerably from numerical value；
Step 3：Slipping smoothness filters, and the acceleration value that pressing measures in the process is handled curve graph using filter method,
Obtain more smooth acceleration plots；
Step 4：It is corresponding that pressing starting point, pressing maximum point, pressing end point are chosen from the curve graph obtained in step 3
Acceleration value；The pressing maximum point is pressed at maximum displacement, can be added there are one the of short duration pressing holding stage at this time
Speed is restored to a trend of stationary state from lower position, and then pressing rebound starts, and acceleration is reversely reduced rapidly, from
And will appear an inflection point, this inflection point is exactly to press maximum point；
Step 5：Single hop is taken to carry out quadratic integral to acceleration pressing starting point adjacent in step 4 and pressing maximum point,
The displacement of X, Y, Z axis is obtained respectively；
Step 6：The displacement of X, Y-axis is projected on Z axis, the sinking of the according to pressing depth value and back at shirtfront is calculated separately out
Shift value；
Step 7：By the counted shirtfront of step 6, according to pressing depth value subtracts back sinking displacement value and can be obtained to chest compression
Actual grade value.
2. instrument formula CPR compression depth algorithm according to claim 1, it is characterised in that：In above-mentioned steps five, pair plus
The formula of speed quadratic integral is：
WhereinIndicate acceleration；Indicate speed；Indicate displacement；T indicates the time.
3. instrument formula CPR compression depth algorithm according to claim 1 or 2, it is characterised in that：It is flat in above-mentioned steps three
Cunning is filtered into 5 points of smothing filterings three times.
4. instrument formula CPR compression depth algorithm according to claim 3, it is characterised in that：In above-mentioned steps two and step
The step of mean filter is carried out to the acceleration value that step 2 obtains is added between three.
5. instrument formula CPR compression depth algorithm according to claim 4, it is characterised in that：It is secondary in above-mentioned steps five
Integral is all made of trapezoidal method solution.
6. instrument formula CPR compression depth algorithm according to claim 5, it is characterised in that：Described in above-mentioned steps one
Acceleration transducer is 3-axis acceleration sensor.
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| CN106726437A (en) * | 2016-12-06 | 2017-05-31 | 汕头大学 | CPR assistor |
| US11179293B2 (en) | 2017-07-28 | 2021-11-23 | Stryker Corporation | Patient support system with chest compression system and harness assembly with sensor system |
| CN109223503B (en) * | 2018-10-09 | 2020-11-13 | 深圳市智城华业科技有限公司 | Method, device, equipment and storage medium for measuring cardio-pulmonary resuscitation compression depth |
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| NO310135B1 (en) * | 1999-05-31 | 2001-05-28 | Laerdal Medical As | System for measuring and applying parameters when performing chest compression in the course of a life-saving situation or training situation as well as applications |
| US7220235B2 (en) * | 2003-06-27 | 2007-05-22 | Zoll Medical Corporation | Method and apparatus for enhancement of chest compressions during CPR |
| EP2317966B1 (en) * | 2008-07-23 | 2019-10-23 | Atreo Medical, Inc. | Cpr assist device for measuring compression parameters during cardiopulmonary resuscitation |
| JP6090776B2 (en) * | 2010-02-12 | 2017-03-08 | ゾール メディカル コーポレイションＺＯＬＬ Ｍｅｄｉｃａｌ Ｃｏｒｐｏｒａｔｉｏｎ | Defibrillator display |
| CN202568806U (en) * | 2012-05-07 | 2012-12-05 | 上海金怡医疗科技有限公司 | Electronic control circuit of cardio-pulmonary resuscitation guidance instrument |
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| 基于加速度二次积分的胸外按压深度测量;钱绍文;《北京生物医学工程》;1;20111031;第 30 卷(第 5 期);摘要、第497页第1栏第4段-第498页第1栏第2段、第498页第2栏最后1段-第500页第2段，附图5 * |
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