Patent Application
20160243314
Devices for monitoring the manual administration of medication.
Particularly in the hospital environment in its different areas such as ICU (Intensive Care Unit), OR (Operating Room), ER (Emergency Room) and floor, patients may constantly receive drug deliveries in order to control their vital signs or diseases. The same principles apply to hospital environment or even at patient's home. Today, most of the control of such operations is manual, and therefore prone to error and inaccuracy.
Drugs accomplish a variety of tasks for medical practice, such as bringing the patient to a desired state of vital signs, anaesthesia level, infection control and others. Patients constantly receive medication, especially when they are in a hospital, and especially when they are in an operating room or ICU and Emergency Area. Monitoring the administration of drugs, saving information and any further treatment of data are critical for a correct medical treatment.
Today, monitoring of medical drug administration is mostly performed manually, either by the hospital personnel or the doctor. Such manual operations are subject to the personnel criteria and might not be properly recorded. In fact, sometimes drug delivery is done under great stress, like in the operating room, ICU or emergency areas, and monitoring falls into a lower priority task and therefore potentially skipped. This might be a problem for the patient but also to the hospital management, which does not acknowledge this drug delivery neither in their medical history nor in their financial records.
Adding an automatic monitoring system to control such drug deliveries has several benefits for the safety of the stakeholders.
For patients: reduced anxiety through a higher level of control, higher level of control for hospital personnel, more accurate drug tracking, and also, in the case of self-medication, this kind of system could be of help for those with certain impairments, such as visual impairment.
For the hospital personnel (doctors/nurses): extra layer of control, which adds to the doctor's manual control, an automatic confirmation of operations, an increase drug delivery accuracy, alleviation of manual tasks, streamlining of operations, letting the doctor focus on other tasks, and also, linked to the monitoring system, it can estimate which amount of drug is necessary and its potential automation. For hospitals and sanitary centres: highest standards of operation delivered to their patients, control and tracking of operations for compliance, and the ability to precisely bill all used materials for a certain patient. For pharmaceutical companies: accurate track of drug usage, compliance, reduced incidents due to liability, and extensive laboratory data on the field available.
There is several known automatic medication delivery machines currently used which cover a small part of the medication that need to be delivered to a patient imposing the restrictions above mentioned of using automatic drug delivery machines. This is not practical for most of medication, both in the operating room, ICU, emergency and the hospital room.
It has been disclosed in patent US20060178578—Vision system to calculate a fluid volume in a container—an automatic delivery system, which uses a linear sensor to monitor the syringe. This system interferes in the current medical practice, as the doctor cannot insert manually the medication into the patient but needs to use the delivery machine to do so. Such machine does not allow freedom to the doctor to react to patient needs with appropriate timing.
The document US 2007/0239482 relating to a “Vision Based Data Acquisition System and Method For Acquiring Medical and Other Information” discloses generic camera-based methods to control everything that happens in an operating room. However, no further detail on which is the acquisition system that will allow the correct visualization of the medication process nor how the image is processed to reach the variables of interest -type of medication, injected volume. The document discloses a system that
has generic cameras on top of the room that record everything, but such system has not the image definition nor the correct angulation to be able to identify the administered drug nor its volume, i.e. has an automatic imaging process system that automatically tracks the delivered drug.
U.S. Pat. No. 5,651,775A proposes a system to track medication administration based on a cradle for each syringe, and a table to place all administration syringes. Specifically this patent proposes a system that:
These characteristics limit the maneuverability of caregivers and forces them to change the way they operate today. Inserting the syringe in the proposed system in this patent might be time consuming.
US2001/0056258 is pretty similar to U.S. Pat. No. 5,651,775A, in which a cradle, a supporting device and a linear array are needed, limiting the degree of operation of the caregiver. In the embodiment with camera, it is placed alongside of the syringe, in a parallel plane.
US2002/0099334 seems an adaptation to a manually operated device, but still needs the use of a cradle and a holding device, making it very unpractical for current medical practice.
US2012/0268741 A1 proposes an invention to measure the plunger position through an optical system. Most of the embodiments propose a linear arrangement for either the lighting array or the sensor array, falling into the disadvantages cited for the previous documents (e.g. U.S. Pat. No. 5,651,775A). In fact, claim 1 states a linear element. There are some embodiments which take a measure solely from the back of the syringe, which also limits the maneuverability of the device, and also poses serious technical concerns on how this device would work when the hand of the caregiver is administering the dose. Also, the medication needs to be translucent, which is not always the case in usual medial practice.
US2011/0112474 proposes a measuring device that allows caregiver to operate freely. It introduces the limitation that it needs to be held with one hand. For the ID, it proposes several technologies. For the optical option, it is proposed a code in the head of the syringe, with the following disadvantages:
In view of the prior art, there is still the need for finding new means for an automatic monitoring system in addition to the doctor's manual operation through a device for monitoring the manual administration of medication.
SUMMARY OF THE DISCLOSURE
A first aspect relates to a device for monitoring the manual administration of medication included in a syringe, comprising:
A second aspect relates to a method for monitoring the manual administration of medication employing the device.
The device, and the method using it, overcomes the drawbacks of U.S. Pat. No. 5,651,775A and the other prior art mentioned above.
In contrast, thanks to the present invention:
From a geometric point of view, the present invention places the sensors in the head of the medication container and encompasses the cylinder, instead of the access port, as it is the case in US 2011/0112474, wherein the sensor is arranged in the same housing as the injection end.
The present invention is a device that has at least one camera that does not obstruct any side of the syringe. The caregiver can see and touch the syringe from any point.
As can be seen in
According to an embodiment, said housing comprises means for clipping the port access 5, which generally will be a disposable piece.
The device according comprises means for processing the images obtained by said one or more cameras 6 enabling identifying a label 3 placed on the syringe and/or determining the volume of medication administered via the syringe 2 by detecting the syringe position and size, estimating the embolus 11 position and computing the difference between the beginning of the operation and the end of the operation.
The port access 5 is located in the center of the support element 4, as can be seen in
According to a first embodiment, shown in
According to a second embodiment, shown in
In any of the embodiments, said one or more cameras 6 are placed at most 20 cm from the port access 5, more preferably at most 4 cm from the port access 5, even more preferably at most 2 cm from the port access 5 and said means for processing images is a microprocessor optionally included in said device.
The label is a QR code(Quick Response code), a 2D bar code, a datamatrix or printed letters or the label is a RFID. In the latter case the administered medication is identified by a receptor of radio frequencies incorporated into the device and not by said at least one camera. In this particular last case, the said at least one camera is only provided for measuring the volume of administered medication. In another particular case, the administered medication can be identified by a spectrophotometer coupled to the device of the invention. If the means to be read is a QR code, once it has been captured by said at least one camera, the image is processed by an image processing method. This method comprises the steps of locating the QR positioning marks in the image, correcting geometrical distortions, and decoding QR contents. Please see below for further details:
In some embodiments, said one or more cameras 6 comprise a CCD optical sensor and a lens and preferably polarizing or antireflection filters. The CCD is placed parallel to the transversal plane 9 and the lens are oblique to the CCD plane such that the optical axis 10 of the one or more cameras 6 intersect said longitudinal axis 8;
In an embodiment, the angle formed between the inclination of the said at least one camera and the support in order to record the label placed on the container is between 0° and 80°, preferably between 5° and 45°, when the distance between said at least one camera and the axis of the administration point is between 1 and 8 cm, more preferably the angle is around 15° when the distance is around 2.5 cm.
If necessary, illumination means 15 can be added to the device, for example LEDs (Light-Emitting Diodes).
A system based on at least one optical camera which detects the QR label can be built as follows. QR standard is described in ISO/IEC 18004.
Said at least one camera (preferably, 2, 3, 4, 5 or 6) detects the container (syringe) from different points of view, covering every angle of it. However, it might be that the QR code falls across the field of view of different cameras.
The steps involved in this detection are described below:
1—Acquisition: Refers to the acquisition of a video stream from each camera.
2—Preliminary detection: from the video stream, a region of interest where the QR is located can be detected by use of local statistics, in particular local histogram and variance. This method has the advantage of being invariant to scale and translations, and accelerates the operation by focusing on the region of interest only.
The local histogram is defined as the color histogram in the neighborhood (N) of the pixel of interest. The goal is to discriminate black and white patterns from other kind of patterns. The histogram buckets are set evenly throughout the color range, and threshold levels are calibrated to determine whether a pattern is mostly black and white.
The local pair variance is defined within a range of pixels N (square of pixels of size n by n) as the sum of the squared difference of the intensity of each pixel with their neighbors. This measure has the goal to discriminate patterns that look like a QR. The threshold ox that determines if a pattern is a QR is calibrated.
Unlike common geometrical transforms used for QR detection, like IPT (Inverse Perspective Transform), given the cylindrical shape and the close distance of the camera, there is a need to correct the distortion of the rounded shape of the QR on the syringe.
The change of coordinates can be performed through B-spline interpolation, using pre-calibrated control points. Alternatively, the QRs could be printed in a way that the distortion induced by the image capture is minimized.
Once the image has been geometrically corrected through the coordinate change, the Hough Transform can be used to accelerate edge detection.
More details relating to geometrical transformation are exposed below.
Alternatively, further fiducial marks can be introduced in the label to help guide the detection of the QR label. In particular a red dashed line can be drawn around the QR label to help guide detection.
The volume of administered medication could be calculated by syringe piston displacement after being recorded by the camera and processed by an image processing method. This method includes identifying the embolus position by its shape, edges, including the pushing extension, or the pushing seal, color, position or direction, and mapping its position to a level of administered volume. These features for defining the embolus position have the following considerations:
These criteria will be used to filter the different detected movements and discriminate from other spurious movements and in this way, the robustness of the image processing method is increased. This process is performed with each camera, each one leading to a volume estimation. In some cameras, there will be little confidence in the measure as there might be occlusions, and others might give a very reliable measure. The confidence measure will be obtained by the correlation between the target object and the measured object. The final volume estimation, will be obtained by the average weighted by the confidence of the individual measures.
Processors for processing the images can include, without being limited thereto, a microprocessor included in the device or microprocessor external to the device. In one embodiment, the processor is a microprocessor included in the device. Said microprocessor may also centralize the patient's vital signals and the patients' medical record.
The device disclosed herein is able to monitor the manual administration of medication in a minimal invasive way to the practitioner. The incorporation of camera(s) allows to decrypt a tagged container (preferably a syringe) e.g. with a QR code and through image processing algorithms, compute which is the inserted volume. In this way, there is no change in current medical operations, that is, the device is transparent to the medical workflow. This device can be embedded into a small apparatus that can be held close to the patient, much like a watch.
In an embodiment, the sensor and lens are in parallel planes. This configuration permits to have a better focus in the Region-Of-Interest (ROI) keeping all other optics parameters the same (notably aperture and lens size).
Adequate positioning permits seeing various types of syringes, notably from 1 ml to 20 ml and everything in between, with centered or eccentric insertion points.
Illumination is a critical aspect of a vision system. The proposed configuration is prone to show artifacts in the form of reflections. To mitigate its effects, the following techniques can be implemented in the present invention:
Non reflectance materials: Some materials (shiny) are more prone to reflections, thus, the use of matte syringes and labels to mitigate the effect of reflections can be enforced.
Image processing: ID
Labels: Distorted labels can be used in combination with the above features. Given that the image projection of the labels into the cameras will create a distortion, labels can be printed with the inverse transformation to mitigate this effect.
Although reference has been made to specific embodiments, it is apparent to one skilled in the art that the device and method described are susceptible to numerous variations and modifications, and that all the details mentioned can be substituted by other technically equivalent, without departing from the scope of protection defined by the appended claims.
This application is a continuation of International Application No. PCT/EP2013/072785, filed October 31.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2013/072785 | Oct 2013 | US |
| Child | 15142518 | US |
