CN211934056U - Flow sensor for pulmonary function detection - Google Patents

Abstract

The utility model provides a flow sensor for pulmonary function detects, including the base member, be equipped with the perforating hole on the base member and first get pressure mouth, second and get pressure mouth, the inside diameter of perforating hole keeps unanimous, is provided with the throttle plate in the perforating hole, has seted up the aperture on this throttle plate. Get the pressure port and set up in the place that saliva or condensate water should not gather, in the test process, flow sensor can not only effectively avoid saliva or condensate water jam to get the pressure port condition, and the air resistance in the flow sensor is little. The processing is convenient, and the qualification rate of finished products is improved.

Description

Flow sensor for pulmonary function detection

Technical Field

The utility model relates to the field of medical equipment, in particular to a flow sensor for pulmonary function detects.

Background

The functions of the organs of the human body can only work normally under the condition of sufficient oxygen supply. The oxygen supply of the human body is obtained exclusively by the respiration of the lungs, which take in oxygen and expel the metabolite carbon dioxide during respiration. The lung function detection result can analyze the respiratory function of a tester, and has practical clinical significance in identifying the type of airway obstruction, evaluating the lung function before chest and abdomen surgery and the like.

According to different detection principles, lung function detectors can be classified into a float-type lung function testing device, a rotary-type lung function testing device, and a lung function testing device with a flow sensor as shown in chinese patent ZL 201610747160.1.

The flow sensor described in the chinese patent ZL201610747160.1 adopts the principle design of venturi tube, including the base member, be equipped with the perforating hole that can blow and high pressure get pressure mouth, low pressure get pressure mouth on the base member, high pressure get pressure mouth, low pressure get pressure mouth respectively with the perforating hole intercommunication, the diameter in the middle of the perforating hole is less than the diameter at both ends, and the little one section of diameter is the larynx section in the middle of the perforating hole, and one section that the air at perforating hole both ends was insufflated is the entrance section, high pressure get pressure mouth and entrance section and be linked together, low pressure get pressure mouth and larynx section intercommunication. The flow sensor calculates and analyzes the proper change gradient of the diameter difference by utilizing the fixed diameter difference of different hole sections of the through hole, and ensures that the pressure difference in a laminar flow state can be obtained between the high-pressure taking port and the low-pressure taking port, so that the flow sensor has higher detection sensitivity and accuracy. The diameter of the middle of the through hole is smaller than the diameters of the two ends, so the diameter of the through hole determines the ventilation resistance of the flow sensor, and the excessive resistance has certain influence on the flow peak value of the lung function detection. Meanwhile, the through hole in the form has higher requirements on the processing technology and has certain processing difficulty. In the use process, the base body is connected with the lung function instrument in a clamping mode through the clamping column. When the base body is clamped on the pulmonary function instrument, the high-pressure taking port and the low-pressure taking port are just positioned under the base body, and the lowest position of the base body is positioned under the base body. During the test, the tester breathes out a gas carrying a large amount of moisture and mouth water. Under certain environmental conditions, the water vapor forms condensed water on the inner wall of the circular through hole of the substrate, and the condensed water flows to the lowest position of the substrate along the pipe wall. And the high-pressure taking port and the low-pressure taking port are just positioned at the lowest position of the base body, and condensed water or tap water flowing down can be gathered at the high-pressure taking port and the low-pressure taking port. Under the condition that the high-pressure taking port and the low-pressure taking port are not large in diameter, the pressure taking port is easily blocked by water, so that the test cannot be smoothly carried out.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model discloses a flow sensor for pulmonary function detects, including the base member, be equipped with the perforating hole on the base member and first get pressure mouth, second and get pressure mouth, first get pressure mouth and second get pressure mouth respectively with the perforating hole intercommunication, the inside diameter of perforating hole is unanimous, is provided with the throttle plate in the perforating hole, has seted up the aperture on this throttle plate.

In a preferred embodiment, the orifice 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.

Furthermore, the perforated throttle plate divides the through hole into a first vent pipe and a second vent pipe, the first pressure taking port is arranged in the first vent pipe section, and the second pressure taking port is arranged in the second vent pipe section.

Furthermore, the positions of the first pressure measuring port and the second pressure measuring port on the vent pipe are not arranged on the longitudinal section of the ventilation direction of the base body when the flow sensor is in the use state.

Furthermore, the flow sensor also comprises a clamping column, and when the clamping column is vertically placed, the pressure taking port is not arranged on the central connecting line of the two clamping columns.

Furthermore, the device also comprises a mouthpiece, wherein the mouthpiece comprises a meshing end and a connecting end, the pipe diameter of the connecting end is matched with the connecting part of the base body, and the two can be mutually spliced or sleeved together in an airtight and sealed manner.

Furthermore, a boss is arranged on the mouthpiece connecting end, and a notch matched with the boss in shape is arranged on the base body connecting part.

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

Furthermore, a groove is arranged on the outer side of the pipe wall of the connecting end, and a bulge matched with the groove is arranged on the inner wall of the pipe orifice of the connecting part of the substrate.

The utility model has the advantages that: the utility model discloses a flow sensor has adjusted the position of getting the pressure mouth, has effectively avoided the condition of mouthful water or condensate plugging getting the pressure mouth in the test procedure, and the resistance of ventilating in the flow sensor is little, and the influence of the flow peak value when examining time measuring to pulmonary function is little. Meanwhile, the processing difficulty is reduced, and the product percent of pass is greatly improved.

Drawings

Fig. 1 is the external structure schematic diagram 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 clamp column and the pressure tapping.

Fig. 3 is a sectional view in the direction of fig. 1A-a.

Fig. 4 is a schematic structural view of the flow sensor display throttle plate of the present invention.

FIG. 5 is a schematic view of a configuration in which the mouthpiece is not inserted into the flow sensor base.

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

Fig. 7 is a schematic view of the mouthpiece in preparation for removal from the flow sensor base.

Detailed Description

As shown in fig. 1 to 4, the flow sensor for detecting lung function is connected with a lung function instrument host to form a lung function testing device, or the flow sensor is connected with a testing handle. The flow sensor comprises a base body 1, wherein a through hole 2 capable of blowing air, a first pressure taking port 3 and a second pressure taking port 4 are formed in the base body 1, and the first pressure taking port and the second pressure taking port are respectively communicated with the through hole. The inner diameter of the through-hole 2 is kept uniform, i.e. 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 in the throttle plate 5. The perforated throttle plate 5 divides the through hole into two parts, namely a first vent pipe 21 and a second vent pipe 22, and the first vent pipe 21 and the second vent pipe 22 are communicated through a small hole 51. In a preferred embodiment, the orifice 51 is located in the center of the throttle plate 5. In a more specific scheme, 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 at the section of the first vent pipe 21, and the second pressure taking port 4 is arranged at the section of the second vent pipe 22. One opening of the pressure taking port faces to the inside of the vent pipe, and the other opening of the pressure taking port is connected with the differential pressure sensor. In addition, in order to avoid the situation that the pressure taking port is blocked by the tap water or the condensed water in the test process, the positions of the first pressure taking port and the second pressure taking port on the vent pipe are not arranged on the longitudinal section of the ventilation direction of the base body when the flow sensor is in the use state. For example, when the flow sensor is connected to the lung function instrument main unit or the test handle and then tested, if the flow sensor is in the horizontal test position, the pressure-taking port is provided outside the longitudinal section of the through hole, as shown in fig. 3. For another example, as shown in fig. 2, the pressure-extracting port is not provided on the center line of the two chucking posts 6. When the clamp column is vertically inserted into the lung function instrument host or the test handle, the pressure taking port is not positioned on the through hole and the longitudinal section of the clamp column.

The flow sensor shown in fig. 5 to 7 may further include a mouthpiece 8, which may be fixedly connected to the base of the sensor and detachably connected to the flow sensor. The tester holds the mouthpiece to blow or suck air into the through hole of the base body. In one embodiment, the base body further comprises a connecting portion 7 that mates with the mouthpiece. The mouthpiece 8 comprises a snap-in end 81 and a connecting end 82, the pipe diameter of which is adapted to the base body connecting part 7, which can be plugged or sleeved together in an air-tight manner.

In a further design scheme, a boss 83 is arranged on the mouthpiece connecting end 82, and a notch 71 matched with the boss 83 in shape is arranged on the base body connecting part 7. When the test fixture is installed, the convex part of the boss 83 is aligned with the notch 71 of the base body connecting part 7, and then the connecting end of the mouthpiece is inserted into the base body through hole, so that the correct test position of the newly installed mouthpiece can be ensured every time. In an advantageous design, the projection 83 is tongue-shaped and the gap 71 is arc-shaped, the arc of which is the same as the arc of the tongue-shaped projection. When in installation, the tongue-shaped lug boss used as an installation indicating element is aligned to the arc-shaped opening, and the insertion of the mouthpiece and the base body is completed. By the design, the mouthpiece can be installed at a correct test position, and the arc-shaped boss and the arc-shaped opening with extremely strong line feeling can be connected to make the connection of the mouthpiece more attractive. In embodiments where the mouth of the mouthpiece 8 is an elliptical opening. When the mouthpiece is arranged on the base body, namely when the lug boss is inserted into the notch, the long axis direction of the oval opening is ensured to be parallel to the long axis direction of the human mouth.

In a preferred embodiment, but with the mouthpiece attached to the base, the lower surface 831 of the forward end of the boss 83 abuts the upper surface 711 of the wall of the slit. When the mouthpiece is to be detached from the base body, the abutting part becomes a stress point, and the mouthpiece can be detached from the base body only by slightly bending the mouthpiece upwards along the opening direction. This solution does not require much effort to remove the mouthpiece from the base, as compared to removing the mouthpiece along the longitudinal axis of the base.

In order to avoid the loose between the mouthpiece and the base body which are installed together, the outer side of the pipe wall of the connecting end 82 of the mouthpiece is also provided with a clamping device matched with the base body. In the embodiment shown in fig. 5, the outer side of the tube wall of the connecting end 82 is provided with a groove 84, and the inner wall of the tube opening of the base connecting part 7 is provided with a protrusion 74 matched with the groove. The disposable mouthpiece and the base body connecting part are made of medical plastics, and when the mouthpiece is inserted into the inner wall of the base body connecting part, the protrusion is extruded into the groove and clamped in the groove, so that the situation that the inserting connection of the mouthpiece and the base body is loosened during inspection is further avoided. Of course the projection and recess locations may be interchanged.

It is right flow sensor develop verification experiment show, it can effectively avoid in the test process saliva or the condition that the condensate water blocking got the pressure mouth, and flow sensor is interior the resistance to ventilation is little, the influence of the flow peak value when examining time measuring to pulmonary function is little. Meanwhile, the processing difficulty is reduced, and the product percent of pass is greatly improved.

Claims (10)

1. A flow sensor for pulmonary function detects, including the base member, be equipped with the perforating hole on the base member and first get pressure mouth, second and get pressure mouth, first get pressure mouth and second and get pressure mouth and communicate with the perforating hole respectively, its characterized in that, the inside diameter of perforating hole is unanimous, is provided with the throttle plate in the perforating hole, has seted up the aperture on this throttle plate.

2. The flow sensor of claim 1, wherein the orifice is located in a central location of the throttle plate.

3. The flow sensor according to claim 1, wherein the diameter of the through hole is 27 to 30mm, the diameter of the small hole in the throttle plate is 13 to 15mm, and the thickness of the throttle plate is 1 to 5 mm.

4. The flow sensor according to claim 1, wherein the perforated restrictor plate divides the through-hole into a first vent pipe and a second vent pipe, the first pressure-taking port is provided in the first vent pipe section, and the second pressure-taking port is provided in the second vent pipe section.

5. A flow sensor according to any one of claims 1 to 4, wherein the first and second pressure taps are not located on the vent conduit at a position which is transverse to the direction of venting of the substrate when the flow sensor is in use.

6. The flow sensor according to one of claims 1 to 4, further comprising a latch, wherein the pressure tap is not provided on a center line connecting two latches when the latches are vertically placed.

7. A flow sensor according to any one of claims 1 to 4, further comprising a mouthpiece, the mouthpiece comprising a snap-in end and a connecting end, the connecting end having a tubular diameter adapted to fit the base connecting portion, the two being capable of being plugged or sleeved together in an airtight manner.

8. The flow sensor according to claim 7 wherein the mouthpiece connecting end has a boss and the base connecting portion has a notch shaped to match the boss.

9. A flow sensor according to claim 7, wherein the outer side of the tubular wall of the coupling end of the mouthpiece is further provided with a clamping means for engaging the base body.

10. The flow sensor according to claim 9, wherein the outer side of the tube wall of the connecting end is provided with a groove, and the inner wall of the tube opening of the connecting part of the base body is provided with a protrusion matched with the groove.

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