CN211934056U - Flow sensor for pulmonary function detection - Google Patents

Abstract

The utility model provides a flow sensor for lung function detection, which comprises a base body, the base body is provided with a through hole, a first pressure taking port and a second pressure taking port, the inner diameter of the through hole is kept the same, and a through hole is arranged in the through hole. The throttle plate is provided with small holes. The pressure-taking port is set in a place where saliva or condensed water should not gather. During the test, the flow sensor can not only effectively prevent the saliva or condensed water from blocking the pressure-taking port, but also the ventilation resistance in the flow sensor is small. It is convenient for processing and improves the qualified rate of finished products.

Description

Flow Sensors for Pulmonary Function Testing

technical field

The utility model relates to the field of medical instruments, in particular to a flow sensor used for lung function detection.

Background technique

The functions of various organs in the human body can only work properly when there is an adequate supply of oxygen. The oxygen supply of the human body is obtained entirely by the respiration of the lungs. During the respiration process, the lungs take in oxygen and expel the metabolite carbon dioxide. Pulmonary function test results can analyze the respiratory function of the tester, which has practical clinical significance in identifying the type of airway obstruction and evaluating the lung function before thoracic and abdominal surgery.

According to different detection principles, pulmonary function testers can be divided into buoyancy pulmonary function testing devices, rotary pulmonary function testing devices, and pulmonary function testing devices with flow sensors as shown in Chinese Patent ZL201610747160.1.

The flow sensor described in Chinese patent ZL201610747160.1 adopts the principle design of Venturi tube, including a base body, which is provided with through holes for blowing air, high pressure pressure taking ports, low pressure pressure taking ports, high pressure pressure taking ports, and low pressure pressure taking ports. The ports are respectively communicated with the through holes, the diameter in the middle of the through holes is smaller than the diameter of the two ends, the section with the smaller diameter in the middle of the through holes is the throat section, and the section where the air at both ends of the through holes is blown is the inlet section, and the high pressure pressure taking port It is communicated with the inlet section, and the low pressure pressure taking port is communicated with the throat section. This flow sensor uses the fixed diameter difference of different hole sections of the through hole to calculate and analyze the appropriate change gradient of the diameter difference to ensure that the pressure difference in laminar flow state can be obtained between the high and low pressure pressure taking ports, so that the flow sensor has a high detection rate. Sensitivity and accuracy. Since the diameter of the middle of the through hole is smaller than the diameter of the two ends, the diameter of the through hole determines the ventilation resistance of the flow sensor, and an excessive resistance has a certain influence on the flow peak value of the lung function detection. At the same time, this form of through hole has relatively high requirements on the processing technology, and has certain processing difficulties. During use, the base body is connected with the spirometer through the clamping column. When the base is clamped on the spirometer, the high-pressure pressure port and the low-pressure pressure port are located just below the base, and just below the base is the lowest position of the base. During the test, the breath exhaled by the test subjects carried a large amount of water vapor and saliva. Under certain circumstances, water vapor forms condensed water on the inner wall of the circular through hole of the base body, and the condensed water flows along the pipe wall to the lowest position of the base body. The high-pressure and low-pressure ports are located at the lowest position of the substrate, and the condensate or saliva flowing downstream will accumulate at the high-pressure and low-pressure ports. When the diameters of the high-pressure and low-pressure pressure-taking ports are not large, the pressure-taking ports are easily blocked by water, resulting in the failure of the test to proceed smoothly.

Utility model content

In order to overcome the above shortcomings, the purpose of this utility model is to use a flow sensor for lung function detection, including a base body, the base body is provided with a through hole, a first pressure-taking port, a second pressure-taking port, the first pressure-taking port and the second pressure-taking port. The pressure taking ports are respectively communicated with the through holes, the inner diameters of the through holes are the same, a throttle plate is arranged in the through hole, and a small hole is opened on the throttle plate.

In a preferred solution, the small hole is located in the center of the throttle plate.

More specifically, the diameter of the through hole 2 is 27-30 mm, the diameter of the small hole 51 on the throttle plate is 13-15 mm, and the thickness of the throttle plate is 1-5 mm.

Further, the perforated throttle plate divides the through hole into a first vent pipe and a second vent pipe, the first pressure taking port is provided on the first vent pipe section, and the second pressure take port is provided on the second vent pipe section.

Further, the positions of the first pressure-taking port and the second pressure-taking port on the ventilation pipe are not set on the longitudinal section of the base body in the ventilation direction when the flow sensor is in use.

Further, the flow sensor further includes a clamping column, and when the clamping column is placed vertically, the pressure taking port is not arranged on the center connecting line of the two clamping columns.

Further, a mouthpiece is also included. The mouthpiece includes an engaging end and a connecting end. The pipe diameter of the connecting end is adapted to the connecting portion of the base body, and the two can be plugged or sleeved together in an air-tight manner.

Further, a boss is provided on the connecting end of the mouthpiece, and a gap matching the shape of the boss is provided on the connecting portion of the base body.

Preferably, the outer side of the pipe wall of the connecting end of the mouthpiece is further provided with a tightening device matched with the base body.

Further, a groove is provided on the outer side of the pipe wall of the connecting end, and a protrusion matched with the groove is provided on the inner wall of the nozzle of the base body connecting part.

The beneficial effects of the utility model are: the flow sensor of the utility model adjusts the position of the pressure-taking port, effectively avoiding the situation that the pressure-taking port is blocked by saliva or condensed water during the test process, and the ventilation resistance in the flow sensor is small , which has little effect on the flow peak during pulmonary function testing. At the same time, the processing difficulty is reduced, and the product qualification rate is greatly improved.

Description of drawings

Figure 1 is a schematic diagram of the external structure of the flow sensor of the present invention.

FIG. 2 is a schematic structural diagram of the flow sensor of the present invention showing the relationship between the clamping column and the pressure taking port.

FIG. 3 is a cross-sectional view taken in the direction A-A of FIG. 1 .

Figure 4 is a schematic structural diagram of the flow sensor display throttle plate of the present invention.

FIG. 5 is a schematic structural diagram of the mouthpiece not inserted into the flow sensor base.

FIG. 6 is a schematic view of the structure of the mouthpiece inserted into the flow sensor base.

Fig. 7 is a schematic structural diagram of the mouthpiece ready to be taken out from the flow sensor base.

Detailed ways

As shown in Figures 1 to 4, the flow sensor for pulmonary function testing is connected with the spirometer host to form a pulmonary function testing device, or the flow sensor is connected with a test handle. The flow sensor includes a base body 1, and the base body 1 is provided with a through hole 2 capable of blowing air, as well as a first pressure taking port 3 and a second pressure taking port 4, which are respectively communicated with the through hole. The inner diameter of the through hole 2 is kept the same, that is, the diameter in the middle of the through hole is the same as the diameter at both ends. A throttle plate 5 is provided in the through hole, and a small hole 51 is opened on the throttle plate 5 . The perforated throttle plate 5 divides the through hole into two parts, which are the first ventilation pipe 21 and the second ventilation pipe 22 respectively. In a preferred solution, the small hole 51 is located at the center of the throttle plate 5 . In a more specific solution, the diameter of the through hole 2 is 27-30 mm, the diameter of the small hole 51 on the throttle plate is 13-15 mm, and the thickness of the throttle plate is 1-5 mm.

The first pressure taking port 3 is arranged in the first ventilation pipe 21 section, and the second pressure taking port 4 is arranged in the second ventilation pipe 22 section. One opening of the pressure taking port faces into the vent pipe, and the other opening is connected with the differential pressure sensor. In addition, in order to avoid the situation that saliva or condensed water block the pressure-taking port during the test, the positions of the first pressure-taking port and the second pressure-taking port on the ventilation pipe are not set in the direction of the base body ventilation when the flow sensor is in use. longitudinal section. For example, after the flow sensor is connected to the spirometer main unit or the test handle, during the test, if the flow sensor is in the horizontal test position, the pressure taking port is set on the outside of the longitudinal section of the through hole, as shown in Figure 3. For another example, as shown in FIG. 2 , the pressure taking port is not provided on the center line of the two clamping columns 6 . When the clamping post is vertically inserted into the main unit of the spirometer or the test handle, the pressure taking port is not on the longitudinal section of the through hole and the clamping post.

The flow sensor shown in FIGS. 5 to 7 may further include a mouthpiece 8, which can be fixedly connected to the base of the sensor and detachably connected to the flow sensor. The tester blows or inhales into the through hole of the base body with the mouthpiece. In a specific design solution, the base body further includes a connecting portion 7 that is matched with the mouthpiece. The mouthpiece 8 includes an engaging end 81 and a connecting end 82, the diameter of the connecting end is adapted to the base connecting portion 7, and the two can be plugged or sleeved together in a hermetically sealed manner.

In a further design solution, the mouthpiece connecting end 82 is provided with a boss 83 , and the base body connecting portion 7 is provided with a notch 71 matching the shape of the boss 83 . When installing, insert the connecting end of the mouthpiece into the through hole of the base body after the protruding part of the boss 83 is aligned with the notch 71 of the base body connecting part 7, so as to ensure that the newly installed mouthpiece can be in the correct test position every time. In an optimized design, the shape of the boss 83 is a tongue shape, and the notch 71 is an arc design, and the arc of the arc is the same as that of the tongue-shaped boss. When installing, align the tongue-shaped boss as the installation indicating element with the arc-shaped notch to complete the insertion of the mouthpiece and the base body. This design not only ensures that the mouthpiece can be installed in the correct test position, but also the arc-shaped bosses and arc-shaped gaps with a strong sense of line make the connection between the two more aesthetically pleasing. In the embodiment where the opening of the mouthpiece 8 is an oval opening. When the mouthpiece is installed on the base, that is, when the boss is inserted into the notch position, it is ensured that the long axis direction of the elliptical opening is parallel to the long axis direction of the human mouth.

In a preferred solution, after the mouthpiece is installed on the base body, the lower surface 831 of the front end of the boss 83 abuts against the upper surface 711 of the pipe wall at the notch. When the mouthpiece is to be detached from the base body, the abutting part becomes a force point, and the mouthpiece can be detached from the base body by gently breaking the mouthpiece upwards in the direction of the notch. Compared with the method of disassembling the mouthpiece along the longitudinal axis of the base body, the solution can easily disassemble the mouthpiece from the base body without much effort.

In order to avoid loosening between the mouthpiece and the base that are installed together, the outer side of the pipe wall of the connecting end 82 of the mouthpiece is also provided with a tightening device that cooperates with the base. In the embodiment shown in FIG. 5 , a groove 84 is provided on the outer side of the pipe wall of the connecting end 82 , and a protrusion 74 matching the groove is provided on the inner wall of the nozzle of the base body connecting portion 7 . Both the disposable mouthpiece and the base connecting part are made of medical plastic. When the mouthpiece is inserted into the inner wall of the base connecting part, the protrusion is squeezed into the groove and stuck in the groove, thereby further avoiding the bite during inspection. The connection between the mouth and the base is loose. Of course the protrusion and groove positions can be interchanged.

The verification experiments carried out on the flow sensor of the present utility model show that it can effectively avoid the situation that saliva or condensed water block the pressure-taking port during the test process, and the ventilation resistance in the flow sensor is small, and the flow peak value when the lung function is detected is small. small impact. At the same time, the processing difficulty is reduced, and the product qualification rate is greatly improved.

Claims (10)

1. A flow sensor for pulmonary function detection, including a base body, the base body is provided with a through hole, a first pressure taking port, a second pressure taking port, and the first pressure taking port and the second pressure taking port are respectively communicated with the through hole, It is characterized in that the inner diameter of the through hole is the same, a throttle plate is arranged in the through hole, and a small hole is opened on the throttle plate. 2 . The flow sensor according to claim 1 , wherein the small hole is located at the center of the throttle plate. 3 . 3. The flow sensor according to claim 1, wherein the diameter of the through hole is 27-30 mm, the diameter of the small hole on the throttle plate is 13-15 mm, and the thickness of the throttle plate is 1-5 mm . 4. The flow sensor according to claim 1, wherein the throttle plate with holes divides the through hole into a first ventilation pipe and a second ventilation pipe, the first pressure taking port is arranged in the first ventilation pipe section, and the second ventilation pipe The pressure taking port is arranged in the second ventilation pipe section. 5 . The flow sensor according to claim 1 , wherein the positions of the first pressure-taking port and the second pressure-taking port on the ventilation pipe are not set on the base body when the flow sensor is in use. 6 . Longitudinal section in ventilation direction. 6. The flow sensor according to one of claims 1 to 4, characterized in that, the flow sensor further comprises a clamping column, and when the clamping column is placed vertically, the pressure taking port is not provided at the center of the two clamping columns. on-line. 7. The flow sensor according to any one of claims 1 to 4, characterized in that it further comprises a mouthpiece, wherein the mouthpiece comprises a biting end and a connecting end, the pipe diameter of the connecting end is adapted to the connecting portion of the base body, and both They can be plugged or socketed together in a hermetically sealed manner. 8 . The flow sensor according to claim 7 , wherein a boss is provided on the connecting end of the mouthpiece, and a gap matching the shape of the boss is provided on the connecting portion of the base body. 9 . 9 . The flow sensor according to claim 7 , wherein the outer side of the pipe wall of the connecting end of the mouthpiece is further provided with a tightening device matched with the base. 10 . 10 . The flow sensor according to claim 9 , wherein a groove is provided on the outer side of the pipe wall of the connecting end, and a protrusion matched with the groove is provided on the inner wall of the nozzle of the base body connecting part. 11 .

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