A brain cotton sheet detection method and a detection device

Abstract

The present application relates to the technical field of brain cotton piece detection, and proposes a brain cotton piece detection method and a detection device, the method is designed based on the clinical real demand of brain cotton piece in neurosurgery operation, directly makes brain cotton piece completely infiltrate in liquid, and measures its water absorption capacity and water absorption amount, which is completely consistent with the operation that nurses immerse brain cotton piece in physiological saline before neurosurgery operation, and place it in the wound during operation and expect it to sink quickly and adhere to brain tissue, therefore, the detection conclusion of the present application can directly reflect the actual performance of brain cotton piece in operation, provides a reliable means for clinical preoperative rapid screening of qualified products, and effectively reduces the operation risk caused by poor performance of cotton piece during operation.

Description

Technical Field

[0001] This invention relates to the technical field of brain cotton pad detection, specifically to a brain cotton pad detection method and detection equipment. Background Technology

[0002] Brain cotton pads are the only type of dressing medical device that enters the cranium during neurosurgery. They are mainly made of medical absorbent cotton, with auxiliary materials including cotton thread, polyester sewing thread, and X-ray detectable components. There are also brain cotton pads made primarily of spunlace nonwoven fabric. Brain cotton pads are used for single-use during neurosurgery. Their main functions are to absorb intracranial exudate, provide clinical wound care, absorb moisture, and clean the skin and wound. Imaging brain cotton pads can also be used to support organs and tissues during surgery.

[0003] Because brain tissue is extremely soft and fragile, and surgical instruments are mostly made of stainless steel and are quite sharp, accidental contact with brain tissue during craniotomy can cause irreversible damage. Brain cotton pads, with their soft properties, can effectively protect the brain and prevent unnecessary damage to surrounding nerves and blood vessels, providing crucial protection for the surgeon's safety during treatment. Therefore, brain cotton pads play an irreplaceable role in neurosurgery for hemostasis, support, and protection of brain tissue.

[0004] In clinical applications, the absorbency and settling time of encephalomyelitis pads are two particularly important performance indicators. Absorbency directly affects the hemostasis and moisture absorption effects during surgery, while settling time affects whether the pad can quickly reach the wound and exert its protective effect. However, currently, encephalomyelitis pad products are basically tested directly using the industry standards for medical absorbent cotton. But encephalomyelitis pads are the final product used directly, and their usage conditions differ greatly from the raw material testing methods of medical absorbent cotton. Therefore, further testing is required before surgery, and currently there is no dedicated testing scheme for encephalomyelitis pads. Summary of the Invention

[0005] This invention proposes a method and equipment for detecting brain cotton pads. The detection results can directly reflect the actual performance of brain cotton pads during surgery, providing a reliable means for rapid preoperative screening of qualified products in clinical practice.

[0006] Therefore, the technical solution adopted is as follows: A method for detecting brain tissue using cotton swabs includes the following steps: S1: Arrange a photoelectric sensor on the test container and add a certain amount of detection liquid to the test container so that the liquid level is within the detection optical path range of the photoelectric sensor. S2: Measure and record the initial weight W1 of the detection liquid in step S1 using a gravity sensor; S3: Place the cotton pad to be tested on the surface of the test liquid and monitor the wetting state of the cotton pad in real time through a visual sensor. When the cotton pad is detected to be fully wetted, record the time difference from when the cotton pad is placed in the test liquid to when it is fully wetted as T1. S4: The moment when the brain cotton pad changes from the state of blocking the light path to the state of not blocking the light path is detected by the photoelectric sensor, and the sinking start time is recorded as the sinking start time. The time difference from when the brain cotton pad is put into the detection liquid to the sinking start time is recorded as T2. S5: Remove the fully soaked cotton pad from the test liquid, and measure and record the weight W2 of the test liquid again using the gravity sensor. S6: Calculate the difference Δt = |T1 - T2| between the complete immersion time T1 and the sinking start time T2, and compare Δt with the preset validity threshold. If Δt ≤ validity threshold, the measured T1 is deemed valid and proceed to the next step. If Δt > validity threshold, the measurement is deemed invalid and the detection equipment needs to be adjusted and a new brain cotton pad to be tested needs to be selected to re-detect from the beginning step. S7: Calculate the water absorption of the cotton pad ΔW = W1 - W2; S8: Compare the effective complete immersion time T1 with the preset immersion time standard range, and compare the water absorption ΔW with the preset water absorption standard range. When T1 falls within the immersion time standard range and ΔW falls within the water absorption standard range, the cotton pad is deemed qualified; otherwise, it is deemed unqualified.

[0007] A further technical solution is that the photoelectric sensor is a through-beam photoelectric sensor, and multiple sets are provided, with the emitters and receivers of the multiple sets of photoelectric sensors respectively arranged on both sides of the test container.

[0008] A further technical solution is that the detection optical path of the photoelectric sensor is not blocked, and the signal remains stable for more than 0.2 seconds after restoration, at which point the effective sinking start time T2 is calculated.

[0009] A brain cotton pad detection device suitable for the above-mentioned brain cotton pad detection method includes a test container, a gravity sensor fixed at the bottom of the test container, a vision sensor fixed at the top, a photoelectric sensor fixed on the side wall of the test container, and a display control unit. The input terminal of the display control unit is electrically connected to the output terminal of the gravity sensor, the output terminal of the vision sensor, and the output terminal of the photoelectric sensor, respectively.

[0010] A further technical solution is that the display control unit further includes a parameter input module, the output terminal of which is electrically connected to the input terminal of the display control unit.

[0011] A further technical solution is that the display control unit also includes a prompting module, the input terminal of which is electrically connected to the output terminal of the display control unit.

[0012] A further technical solution is that a transparent glass cover is attached to the outside of the test container, which encloses the visual sensor and the photoelectric sensor inside.

[0013] The working principle and beneficial effects of this application are as follows: 1. This method is designed based on the real clinical needs of brain cotton pads in neurosurgery. It directly allows the brain cotton pads to be completely soaked in liquid and measures their water absorption capacity and volume. This is completely consistent with the operation of nurses soaking brain cotton pads in physiological saline before neurosurgery, placing them in the wound during surgery and expecting them to sink and adhere to the brain tissue quickly. Therefore, the test results of this application can directly reflect the actual performance of brain cotton pads in surgery, providing a reliable means for rapid screening of qualified products before clinical surgery, and effectively reducing the surgical risks caused by poor cotton pad performance during surgery.

[0014] 2. This method does not rely on a single indicator, but organically combines visual recognition, photoelectric auxiliary verification, and absorbency. Visual recognition ensures thorough wetting and avoids local dry cotton from causing intraoperative adhesion. Photoelectric auxiliary verification eliminates the errors that may be caused by visual recognition. Absorbency directly quantifies the absorbency of the cotton pad. The three judgments verify each other, and any failure can be identified, ensuring the accuracy of the test results.

[0015] 3. The present invention has a clear detection logic and is easy to operate. It does not require complex imaging equipment or AI algorithms. It can be used not only for the factory inspection of brain cotton pad manufacturers, but more importantly, it can also be used for the admission acceptance of hospital equipment departments or the identification inspection before surgery. It provides a complete and quantifiable detection method for brain cotton pad products that currently lack dedicated industry standards. Attached Figure Description

[0016] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the structure of the glass cover described in this application.

[0018] In the diagram: 10, test container; 20, gravity sensor; 30, vision sensor; 40, photoelectric sensor; 50, display control unit; 51, parameter input module; 52, prompt module; 60, glass cover. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] This application provides a method for detecting brain-stimulating cotton pads, specifically including the following steps: S1: Fix a photoelectric sensor 40 on the side wall of the test container 10. The photoelectric sensor 40 is either through-beam or reflective, and its detection light path is located at a predetermined height. Add a certain amount of detection liquid, usually sterile physiological saline or purified water, into the test container 10 so that the liquid level is exactly within the detection light path range of the photoelectric sensor 40. At this time, since the liquid surface is calm and unobstructed, the light path of the photoelectric sensor 40 is unobstructed.

[0021] S2: The gravity sensor 20 located at the bottom of the test container 10 detects the total weight of the test container 10 and the liquid inside in real time. The display control unit 50 reads and records the initial weight value at this time, which is denoted as W1. The accuracy of the gravity sensor 20 should not be less than 0.01g to ensure the accuracy of the water absorption calculation.

[0022] S3: The operator gently places a piece of cotton wool to be tested on the surface of the test liquid. Since the density of the dry cotton wool is less than that of water, it will float on the surface of the liquid. The vision sensor 30 is fixed above the test container 10, with its sensing direction facing the liquid surface. It collects images or light reflection signals in real time. The display control unit 50 has a built-in image processing algorithm that can identify the wetting state of the cotton wool. The dry area appears white and opaque, while the fully wetted area becomes translucent or transparent. When there are no more dry fibers on the cotton wool, it is determined that it has reached the fully wetted state. At this time, the display control unit 50 records the time difference from when the cotton wool is put into the liquid to when it is fully wetted, which is denoted as T1.

[0023] S4: During the floating and water absorption process of the cotton pad, its main body blocks the light path of the photoelectric sensor 40 located on the liquid surface. Therefore, the photoelectric sensor 40 outputs a blocked signal. When the cotton pad is fully soaked, its density exceeds that of the detection liquid, and it begins to sink and leave the liquid surface. Once the cotton pad is completely away from the light path area, the light path of the photoelectric sensor 40 is restored, and its output signal changes from blocked to unblocked. When the display control unit 50 detects this change, it records the time difference from when the cotton pad is placed in the liquid to when the light path is restored, denoted as T2. Note that the position of the photoelectric sensor 40 should be repeatedly and precisely adjusted before fixing it to ensure that the cotton pad blocks the light path when placed on the detection liquid, and leaves the light path range when fully soaked and sinking.

[0024] S5: After the cotton pad is fully soaked and sinks, the operator uses special tools such as tweezers or pull strings on the cotton pad to remove it from the test liquid, taking care to avoid splashing out excess liquid. At this time, the gravity sensor 20 measures the total weight of the test container 10 and the remaining liquid inside again, and the display control unit 50 reads and records it as W2.

[0025] S6: The display control unit 50 calculates the absolute value of the difference between T1 and T2: Δt = |T1 - T2|. It compares this Δt with the validity threshold stored in the display control unit 50, preferably set to 0.5 seconds to 2 seconds. If Δt ≤ validity threshold, it means that the complete immersion time determined by vision is highly synchronized with the sinking start time determined by photoelectric sensor, and the measured T1 is true and reliable. The detection continues to S7. If Δt > validity threshold, it means that there is a significant deviation between the two determinations. Possible reasons include misjudgment by the vision sensor 30 due to air bubbles or refraction interference, mis-triggered activation of the photoelectric sensor 40 due to the slippage of the cotton pad, or abnormal water absorption of the cotton pad itself. At this time, the display control unit 50 determines that the measurement is invalid and issues a prompt message. The operator needs to check the equipment and replace the cotton pad, and start the detection again from S1.

[0026] S7: The display control unit 50 calculates the water absorption of the cotton pad according to the formula ΔW = W1 - W2, and uses the water absorption gravity as a reference parameter for the water absorption volume.

[0027] S8: The display control unit 50 compares the effective T1 with the preset soaking time standard range and compares ΔW with the preset water absorption standard range. When T1 falls within the soaking time standard range and ΔW falls within the water absorption standard range, the cotton pad is deemed qualified; otherwise, it is deemed unqualified, and the specific unqualified items, such as T1 exceeding the standard or water absorption being insufficient, can be displayed through the prompt module 52.

[0028] In a preferred embodiment of this application, for a 2cm×2cm brain cotton pad, we set the following qualification criteria: the standard range of complete immersion time T1 is 2 seconds to 5 seconds, the standard range of water absorption ΔW is 4.5 grams to 5.2 grams, and the data validity verification threshold Δt ≤ 0.5 seconds. Through testing of multiple batches of products with the equipment of this invention, qualified products can consistently meet the standards under these criteria, proving that the settings are effective and clinically feasible.

[0029] This application effectively eliminates the misjudgment of a single sensor by cross-calibrating the time of the visual sensor 30 and the photoelectric sensor 40, ensuring that the T1 used for qualification determination is true and reliable. At the same time, it adopts the weighing method to directly measure the water absorption of the brain cotton pad, which is in line with the clinical use scenario and provides the first dedicated and scientific testing process for brain cotton pads.

[0030] Based on this, the photoelectric sensor 40 is a through-beam photoelectric sensor, and multiple sets are provided. The emitters and receivers of the multiple sets of photoelectric sensors 40 are respectively arranged on both sides of the test container 10. Specifically, 2-4 sets of through-beam photoelectric sensors are arranged evenly or symmetrically along the circumference at the same horizontal height on the side wall of the test container 10. The emitters and receivers of each set are fixed at relative positions on the outer wall of the container. The light beam passes through the container wall and the internal liquid. When the cotton pad floats on the liquid surface, the cotton pad may tilt, fold, or slide towards the edge of the container. A single set of photoelectric sensors may not completely sink the cotton pad, but only deviate from the light beam, causing the light path to recover prematurely, resulting in false triggering. After adopting multiple sets of cross-arrangement, the display control unit 50 only determines the effective sinking start time T2 when all sets of photoelectric sensors detect the recovery of the light path. This significantly reduces the probability of false triggering caused by abnormal cotton pad posture and improves the reliability and repeatability of T2 measurement.

[0031] Simultaneously, the detection optical path of the photoelectric sensor 40 must be unobstructed, and the signal must be restored and stabilized for more than 0.2 seconds before the effective sinking start time T2 is calculated. That is, after the display control unit 50 detects that the output signal of the photoelectric sensor 40 changes from obstruction to non-obstruction, it does not immediately record T2, but starts a delay judgment window. The non-obstruction signal must be continuously and stably maintained for at least 0.2 seconds, or the number of seconds can be adjusted according to the actual situation. Only when it is stable for more than 0.2 seconds is the sinking start event considered to have truly occurred, and T2 is recorded at this time. This delay mechanism can effectively filter out the instantaneous on / off interference of the beam caused by liquid surface sloshing, liquid surface bubbles, etc., thereby avoiding false triggers caused by liquid surface fluctuations or instantaneous interference, making the T2 measurement more accurate, and further improving the anti-disturbance capability of the detection system.

[0032] like Figures 1-2 As shown, this embodiment provides a brain cotton pad detection device for implementing the above method, including a test container 10. The test container 10 is an open container made of transparent material, such as a glass beaker, which facilitates light transmission and visual observation. A gravity sensor 20 is fixed at the bottom of the test container 10. The gravity sensor 20 is a high-precision weighing sensor, and its upper surface is rigidly connected to the bottom of the test container 10. It is used to measure the total weight of the test container 10 and the liquid inside in real time. The output end of the gravity sensor 20 is electrically connected to the input end of the display control unit 50 through a shielded cable.

[0033] A vision sensor 30 is fixed above the test container 10. The vision sensor 30 can be mounted on a height-adjustable bracket, with its lens pointing vertically downwards at the center area of ​​the liquid surface in the test container 10. The vision sensor 30 can be an industrial camera or a color-sensitive sensor module, used to capture images or color changes during the soaking process of the cotton pad. The output of the vision sensor 30 is electrically connected to the input of the display control unit 50.

[0034] A photoelectric sensor 40 is fixed on the side wall of the test container 10. The photoelectric sensor 40 is a through-beam or reflective photoelectric switch. Its installation height is flush with or slightly higher than the set liquid level. The output terminal of the photoelectric sensor 40 is electrically connected to the input terminal of the display control unit 50.

[0035] The display control unit 50 is an embedded industrial controller or PLC, which integrates a timer, an arithmetic module, a comparator, and a storage unit. The input terminals of the display control unit 50 are electrically connected to the output terminals of the gravity sensor 20, the vision sensor 30, and the photoelectric sensor 40, respectively, to receive W1, W2, image signals, and photoelectric switch signals, and to execute the calculation, verification, and judgment logic in the above method. The display control unit 50 is also equipped with a touch screen for displaying the detection process and results.

[0036] Therefore, the device has a compact overall structure, controllable cost, independent operation of each sensor without interference, and centralized data processing of the display and control unit. It can automatically complete the entire process from liquid level positioning, weight recording, immersion identification, time calibration to qualification judgment, which significantly improves detection efficiency and accuracy.

[0037] Based on this, the display control unit 50 also includes a parameter input module 51. The output terminal of the parameter input module 51 is electrically connected to the input terminal of the display control unit 50. The parameter input module 51 can be a soft keyboard implemented on the touch screen of the display control unit 50, or it can be an independent physical button or knob. The operator inputs detection parameters to the display control unit 50 through the parameter input module 51. The detection parameters include the specifications and model of the brain cotton pad to be tested, the effectiveness threshold of T1, the standard range of immersion time, the standard range of water absorption, and the delay recording time threshold of the photoelectric sensor 40, etc. These parameters are stored in the memory of the display control unit 50 for subsequent detection processes. When changing to different batches or specifications of brain cotton pads, the operator can re-enter the corresponding standard values, thereby making the equipment universal and flexible, adaptable to the detection needs of different specifications of brain cotton pads, without modifying the hardware or software code, which makes it convenient for manufacturers and hospitals to adjust the judgment threshold according to their own standards.

[0038] Meanwhile, the display control unit 50 also includes a prompting module 52, the input of which is electrically connected to the output of the display control unit 50. The prompting module 52 includes an audible and visual alarm and a text prompt area on the display screen. When the display control unit 50 executes the testing process, it drives the prompting module 52 to issue corresponding signals based on different results. When the testing is proceeding normally, a flashing green indicator light or a passing voice message will be emitted. When the measurement is deemed invalid, a flashing yellow indicator light accompanied by a short beep will be emitted, and the display screen will show "measurement invalid." When the product is deemed unqualified, a solid red indicator light will be emitted, accompanied by beeps of different frequencies, and the display screen will show "T1 exceeds the standard" or "insufficient water absorption," etc. This provides operators with intuitive and clear feedback, allowing them to know the testing status without reading detailed data. It is particularly suitable for batch continuous testing scenarios, enabling the rapid identification of unqualified products and improving human-machine interaction efficiency.

[0039] In addition, a transparent glass cover 60 is attached to the outside of the test container 10. The glass cover 60 encloses the test container 10 and the gravity sensor 20, vision sensor 30 and photoelectric sensor 40 fixed thereon. The glass cover 60 is made of colorless optical glass with high light transmittance. Its shape is dome-shaped or square. The bottom is sealed to the base of the detection equipment. A door can be set on one side of the glass cover 60 or it can be removed as a whole to facilitate the operation of operators to put in and take out cotton pads, change the test liquid and clean the test container 10. During the test, the glass cover 60 is in a closed state, isolating the test container 10 from the external environment, avoiding disturbance of the liquid surface by personnel movement or airflow generated by ventilation equipment, preventing the photoelectric sensor 40 from being falsely triggered due to liquid surface fluctuations, ensuring the stability of the reading of the gravity sensor 20, and also preventing airborne fiber dust from falling into the test liquid and affecting the recognition accuracy of the vision sensor 30.

[0040] Meanwhile, the glass cover 60 can be equipped with an internal constant light source to assist the visual sensor 30, eliminate the influence of changes in external ambient light on image recognition, ensure the consistency of conditions for complete immersion determination, further improve the consistency of the detection environment and anti-interference ability, and reduce measurement errors caused by changes in the external environment.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for detecting brain-damaging cotton pads, characterized in that, Includes the following steps: S1: Arrange a photoelectric sensor (40) on the test container (10) and add a certain amount of detection liquid to the test container (10) so that the liquid level of the detection liquid is within the detection optical path range of the photoelectric sensor (40); S2: Measure and record the initial weight W1 of the detection liquid in step S1 using a gravity sensor (20); S3: Place the cotton pad to be tested on the surface of the test liquid and monitor the immersion state of the cotton pad in real time through the visual sensor (30). When the cotton pad is found to be fully immersed, record the time difference from when the cotton pad is placed in the test liquid to when it is fully immersed as T1. S4: The moment when the brain cotton pad changes from the state of blocking the light path to the state of not blocking the light path is detected by the photoelectric sensor (40), and the sinking start time is recorded as the time difference from when the brain cotton pad is put into the detection liquid to the sinking start time is recorded as T2. S5: Remove the fully soaked cotton pad from the test liquid, and measure and record the weight W2 of the test liquid again using the gravity sensor (20); S6: Calculate the difference Δt = |T1 - T2| between the complete immersion time T1 and the sinking start time T2, and compare Δt with the preset validity threshold. If Δt ≤ validity threshold, the measured T1 is deemed valid and proceed to the next step. If Δt > validity threshold, the measurement is deemed invalid and the detection equipment needs to be adjusted and a new brain cotton pad to be tested needs to be selected to re-detect from the beginning step. S7: Calculate the water absorption of the cotton pad ΔW = W1 - W2; S8: Compare the effective complete immersion time T1 with the preset immersion time standard range, and compare the water absorption ΔW with the preset water absorption standard range. When T1 falls within the immersion time standard range and ΔW falls within the water absorption standard range, the cotton pad is deemed qualified; otherwise, it is deemed unqualified.

2. The method for detecting brain tissue using cotton swabs according to claim 1, characterized in that, The photoelectric sensor (40) is a through-beam photoelectric sensor, and multiple sets are provided. The emitters and receivers of the multiple sets of photoelectric sensors (40) are respectively arranged on both sides of the test container (10).

3. The method for detecting brain tissue using cotton pads according to claim 1, characterized in that, When the detection optical path of the photoelectric sensor (40) is not blocked and the signal remains stable for more than 0.2 seconds, the effective sinking start time T2 is calculated.

4. A brain cotton pad detection device for implementing the brain cotton pad detection method according to any one of claims 1-3, characterized in that, The test container (10) includes a gravity sensor (20) fixed at the bottom and a vision sensor (30) fixed at the top. A photoelectric sensor (40) is fixed on the side wall of the test container (10). The test container (10) also includes a display control unit (50), whose input terminal is electrically connected to the output terminal of the gravity sensor (20), the output terminal of the vision sensor (30), and the output terminal of the photoelectric sensor (40).

5. The brain cotton pad detection device according to claim 4, characterized in that, The display control unit (50) further includes a parameter input module (51), the output of which is electrically connected to the input of the display control unit (50).

6. The brain cotton pad detection device according to claim 4, characterized in that, The display control unit (50) also includes a prompting module (52), the input of which is electrically connected to the output of the display control unit (50).

7. The brain cotton pad detection device according to claim 4, characterized in that, The test container (10) is fitted with a transparent glass cover (60) which encloses the vision sensor (30) and the photoelectric sensor (40) inside.

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