Pressure sensing device

Abstract

A pressure sensing device comprises a sensor (1) and a protective case (2). The protective case (2) is provided with an accommodating slot (20), and the accommodating slot (20) has an opening on the bottom surface (22) of the protective case (2); the sensor (1) has a measuring end (100) for measuring pressure, and the measuring end (100) is accommodated in the accommodating slot (20); the protective case (2) is further provided with a liquid inlet channel (21), the liquid inlet channel (21) has an opening on the side surface (23) of the protective case (2), and the liquid inlet channel (21) is communicated with the accommodating slot (20). The device solves the technical problem that a pressure sensor would be damaged due to splashing substances, and prolongs the service life.

Description

A pressure sensing device Technical Field

[0001] The present invention relates to the technical field of pressure sensors, and in particular to a pressure sensing device. Background Art

[0002] The pressure sensors currently used in medical products are usually not used alone. Instead, they are integrated into a protective cover (also called the tip in the endoscope) to monitor the pressure in the bladder and / or renal pelvis during laser lithotripsy. Therefore, the protective cover needs to retain a liquid inlet channel to keep the liquid in the bladder and / or renal pelvis connected to the pressure sensor. Currently, the liquid inlet channel of the protective cover is directly in front of the protective cover or the sensor is directly set on the outer side. The present applicant has found that the disadvantage of the existing protective cover is that the splashes generated when the laser is working will splash onto the detection chip of the pressure sensor, causing damage to the pressure sensor and affecting the service life of the pressure sensor.

[0003] Summary of the Invention

[0004] In response to the deficiencies of the prior art, the present invention provides a pressure sensing device, which solves the technical problem that splashes generated during laser operation may splash onto the detection chip of the pressure sensor, causing damage to the pressure sensor, thereby extending the service life of the pressure sensor.

[0005] The present invention is achieved through the following technical solutions:

[0006] A pressure sensing device includes a sensor and a protective cover. The bottom surface of the protective cover is provided with a receiving groove, and the detection end of the sensor is accommodated in the receiving groove. The protective cover is also provided with a liquid inlet channel, which is located on the side of the protective cover and connected to the receiving groove.

[0007] Furthermore, the sensor and the protective cover are fixedly connected.

[0008] Furthermore, the depth direction of the accommodating groove is perpendicular to the bottom surface of the protective cover.

[0009] Furthermore, the flow direction of the liquid in the liquid inlet channel is parallel to the bottom surface of the protective sleeve.

[0010] Furthermore, the sensor includes a detection chip, a protection tube and a wire. The detection chip is fixedly connected to the inner wall of the protection tube. The wire is partially accommodated in the protection tube and electrically connected to the detection chip.

[0011] Furthermore, the detection chip has a detection end for detecting liquid pressure, that is, the detection end for detecting liquid pressure is a part of the detection chip.

[0012] Furthermore, the detection chip is bonded to the inner wall of the protection tube by glue.

[0013] Furthermore, the protection tube is cylindrical, the receiving groove is adapted to the protection tube, and the distance between the outer wall of the protection tube and the inner side wall forming the receiving groove is 0.05-0.09 mm.

[0014] Furthermore, the protection tube is fixedly connected to the receiving groove at its outer wall near the notch of the receiving groove, for example, by gluing.

[0015] Furthermore, the detection chip is spaced apart from the bottom wall forming the accommodating groove.

[0016] Furthermore, the detection chip is located above or below the liquid inlet channel, or within the projection range of the liquid inlet channel (21) when viewed from the extension direction of the liquid inlet channel (21).

[0017] Furthermore, the sensor (1) is an optical fiber pressure sensor or an electronic pressure sensor.

[0018] Furthermore, the outer diameter of the protection tube (11) is 0.31 mm, and the inner diameter of the receiving groove (20) is 0.45 mm.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] By opening the liquid inlet channel on the side of the protective cover 2, the technical problem that splashes generated during laser operation may splash onto the detection chip of the pressure sensor and cause damage to the sensor is solved, thereby extending the service life of the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of an optical fiber pressure sensing device according to an embodiment of the present invention;

[0022] FIG2 is a partial cross-sectional view of the sensor;

[0023] FIG3 is a front view of an optical fiber pressure sensing device;

[0024] FIG4 is a cross-sectional view along AA in FIG3 ;

[0025] Figure 5 is an enlarged view of part B in Figure 4;

[0026] Figure 6 is an enlarged view of part C in Figure 4;

[0027] FIG7 is a cross-sectional view of an optical fiber pressure sensing device according to a second embodiment of the present invention;

[0028] FIG8 is a cross-sectional view of an optical fiber pressure sensing device according to a third embodiment of the present invention;

[0029] FIG9 is an enlarged photograph of a damaged pressure sensor of a conventional pressure mirror.

[0030] 1. Sensor; 10. Detection chip; 100. Detection end; 11. Protective tube; 110. Port; 111. Inner wall; 112. Outer wall; 12. Wire; 2. Protective cover; 20. Receiving groove; 200. Inner wall; 201. Bottom wall; 202. Notch; 21. Liquid inlet channel; 22. Bottom; 23. Side; 24. Top. DETAILED DESCRIPTION

[0031] The following non-limiting detailed description of the technical solution of the invention is provided in conjunction with preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate positions or relationships based on the positions or relationships shown in the accompanying drawings. The term "proximal," as opposed to "distal," refers to the end closer to the operator when the operator holds the instrument. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the indicated technical features. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "multiple" means at least two, such as two or three, unless otherwise specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The liquid inlet channel of the protective cover of the existing pressure measuring scope is located directly in front of the protective cover (i.e., the end face at the farthest end of the protective cover) or the pressure sensor is directly arranged on the outer side of the protective cover (such as in a shallow groove). The inventors of the present application have found that the disadvantage of this protective cover is that even if the diameter of the liquid inlet channel is small, generally less than 0.5 mm, or it is located on the outer side and not directly facing the laser lithotripsy position, the splashes generated when the laser is performing lithotripsy will still splash onto the detection chip / pressure sensing surface of the pressure sensor, causing damage to the pressure sensor within a slightly longer working time, affecting the pressure sensor's measurement and greatly shortening its service life.

[0033] As shown in Figures 1, 2, 3, and 5, a pressure sensing device according to the present invention includes a sensor 1 and a protective cover 2. The sensor 1 and protective cover 2 can be fixedly connected together by some fixing method (such as adhesive bonding). The bottom surface 22 of the protective cover 2 is provided with a receiving groove 20, and the detection end 100 of the sensor 1 is accommodated in the receiving groove 20. The protective cover 2 also has a liquid inlet channel 21. One end of the liquid inlet channel 21 opens to the side surface 23 of the protective cover 2, and the other end of the liquid inlet channel 21 is connected to the receiving groove 20. In a specific embodiment of the present invention, liquid can directly contact the detection end 100 of the sensor 1 after entering through the liquid inlet channel 21.

[0034] The line connecting the proximal and distal ends of the protective sleeve is the axial direction of the protective sleeve. On the endoscope, this axial direction is also the axial direction of the endoscope. The bottom surface 22 of the protective sleeve 2 is perpendicular to this axial direction. In one embodiment of the present invention, the depth direction of the receiving groove 20 (i.e., the extension direction of the receiving groove 20) is perpendicular to the bottom surface 22 of the protective sleeve 2 and parallel to the axial direction of the receiving groove 20. The protective tube 11 enters and is arranged in the receiving groove 20 along the depth direction. In another embodiment of the present invention, the flow direction of the liquid in the liquid inlet channel 21, that is, the extension direction of the liquid inlet channel, is basically parallel to the bottom surface 22 of the protective sleeve 2. For example, the extension direction of the liquid inlet channel is consistent with the radial direction of the protective sleeve at the side opening of the liquid inlet channel, and is perpendicular to the axial direction of the protective sleeve. In another embodiment of the present invention, the extension direction of the liquid inlet channel is not perpendicular to the axial direction of the protective sleeve, and the angle between the two can be an acute angle or an obtuse angle.

[0035] As shown in Figure 2, the sensor 1 includes a detection chip 10, a protective tube 11 and a wire 12. The detection chip 10 is fixedly connected to the inner wall 111 of the protective tube 11, for example, by an adhesive. The wire 12 is partially housed in the protective tube 11 and electrically connected to the detection chip 10. The detection chip 10 has a detection end 100 for detecting liquid pressure. The detection end 100 is the part that senses and detects pressure. The entire detection chip 10 can be located inside the protective tube 11, or the detection end 100 of the detection chip 10 is exposed on the outside of the port 110 of the protective tube 11 or is flush with the port 110 of the protective tube 11. In this embodiment, the detection end 100 of the detection chip 10 is exposed on the outside of the port 110 of the protective tube 11 or is flush with the port 110 of the protective tube 11.

[0036] In another specific embodiment of the present invention, as shown in FIG2 , the detection chip 10 and the inner wall 111 of the protection tube 11 may be bonded together by an adhesive (also commonly referred to as glue, not shown).

[0037] The protective tube 11 is generally cylindrical, and the receiving groove 20 is adapted to fit within the protective tube 11. When the two are coaxial, the spacing d between the outer wall 112 of the protective tube 11 and the inner wall 200 forming the receiving groove 20 is 0.05-0.09 mm. In other words, the inner diameter (diameter) of the receiving groove 20 is 0.1-0.18 mm larger than the outer diameter (diameter) of the protective tube 11. In one specific embodiment, the outer diameter D1 of the protective tube 11 is 0.31 mm, the inner diameter D2 of the receiving groove 20 is 0.45 mm, and the spacing d between the outer wall 112 of the protective tube 11 and the inner wall 200 forming the receiving groove 20 is 0.07 mm.

[0038] As shown in FIG. 4 and FIG. 6 , the outer wall 112 of the protection tube 11 near the notch 202 of the receiving groove 20 can be bonded to the protection sleeve 2 by an adhesive (not shown).

[0039] As shown in Figures 4 and 5, the detection chip 10 is spaced apart from the bottom wall 201 that forms the receiving groove 20. In one specific embodiment, the liquid can flow to the detection end 100 of the detection chip 10. In another specific embodiment of the present invention, as shown in Figures 4 and 5, the bottom wall 201 can be set as an arc surface with a smaller inner diameter at the distal end or a part of a sphere, thereby preventing the protective tube and the detection chip from moving further to the distal end. The bottom wall 201 is the distal end of the receiving groove 20 and becomes the blind end of the receiving groove 20, that is, the receiving groove 20 does not have an opening at the top 24 of the protective cover 2.

[0040] As shown in Figures 4 and 5, the detection chip 10 is located above the liquid inlet channel 21; as shown in Figure 8, the detection chip 10 is located below the liquid inlet channel 21; and as shown in Figure 7, the detection chip 10 is close to the liquid inlet channel 21, that is, the detection chip 10 is located within the projection range of the liquid inlet channel 21 when viewed from the extension direction of the liquid inlet channel 21. In another specific embodiment, the detection end 100 of the detection chip 10 is located above, below, or within the projection range of the liquid inlet channel 21 when viewed from the extension direction of the liquid inlet channel 21.

[0041] Traditional processes place the opening of the liquid inlet channel directly in front of the protective cover, that is, at the top of the protective cover, or place the pressure sensor directly on the outer surface of the protective cover. The present invention first identifies the drawbacks of these traditional designs and, to address them, designs a liquid inlet channel that can transmit pressure, with its external opening located on the side of the protective cover. Compared to traditional processes, this invention solves the technical problem of laser splashes hitting the detection end face of the pressure sensor, causing damage, thereby extending the service life of the pressure sensor.

[0042] 1. Comparison of pressure measurement experiment with front-end opening pressure mirror

[0043] An 8.6Fr tip was used to make four pressure mirrors (numbered D1-D4), and a receiving groove was made inside the tip. The receiving groove opened at the front end face of the tip, close to the working channel and one of the LED light sources. The diameter of the receiving groove was 0.45mm. A fiber optic pressure sensor with a protective tube was placed in it. The outer diameter of the protective tube was 0.31mm. The distal surface of the pressure sensor was the pressure sensing surface. The sensing surface was located below the front end face of the tip, and the sensing surface was coated with zero-degree glue for sealing protection.

[0044] At the same time, a pressure measuring mirror with a liquid inlet channel opening on the side of the present invention is manufactured, wherein two mirrors are provided with a detection chip located above (S1, S2), below (X1, X2) or near the liquid inlet channel (K1, K2).

[0045] A lithotripsy model was constructed using a silicone kidney model, with artificial stones (800 HU) approximately 2-4 mm in diameter placed within the model. Normal saline was flowed through the kidney model, with the saline bag suspended approximately 1 meter above the surface, maintained at a temperature of 25°C, and infused at a rate of 40-60 ml / min. The pressure sensor was calibrated. The laser fiber was inserted into the working channel of the tip, and a Dornier (model H30) holmium laser was used at 18 watts and a frequency of 20 Hz for continuous lithotripsy, while pressure was monitored.

[0046] Experimental results

[0047] The test standard is set as continuous lithotripsy for 30 minutes, and the manometer pressure indication is normal, which is considered passed.

[0048] All four pressure gauges D1-D4 failed. Within 30 minutes, the pressure indicator showed infinite values ​​and could not be zeroed.

[0049] S1 and S2 are all passed. Continue to crush the stone. When the total time reaches 1 hour, the indication is normal.

[0050] X1 and X2 were both passed. The gravel was continued until the total time was close to 1 hour and the indicator was abnormal.

[0051] K1 and K2 were completely passed. Gravel was continued, and when the total time was close to 1 hour, the indicator was abnormal.

[0052] In addition, three mirrors (S3, S4, and S5) were made on the detection chip and located above the liquid inlet channel. All the tests passed and the indication was normal when the total time reached 1 hour.

[0053] A magnified view of the distal end of the damaged mirrors D1-D4 is shown in Figure 9. The large circular hole, only half visible on the upper right, is the working channel. The circular hole on the upper left is the lens. The yellow square object slightly to the left of the center is the LED. The small circular hole 901, located to the right of the LED and below the working channel, and slightly to the center right of the image, is the opening of the receiving slot for the pressure sensor. When the pressure sensor is connected, a golden light is visible, indicating that the Fabry-Perot cavity, located above the fiber end face and used to reflect laser light, has been damaged and lost.

[0054] 2. Comparison of pressure measurement experiments with side-mounted sensors

[0055] In a lithotripsy test, five manometers of a certain brand, each equipped with an electronic pressure sensor attached to the distal outer surface of the tip, showed abnormal pressure readings during five separate lithotripsy sessions lasting 40 minutes to two hours. Two manometers of the present invention (with the detection chip located above the fluid inlet) were tested twice, each lasting one to two hours. Both manometers showed consistently normal pressure readings. Seven days after the two manometers were recovered, laboratory testing confirmed normal pressure readings.

[0056] The above-described embodiments merely represent several embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the scope of the present invention, and all such modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A pressure sensing device, characterized in that: The invention comprises a sensor (1) and a protective cover (2), wherein the protective cover (2) is provided with a receiving groove (20), the receiving groove (20) is opened at the bottom surface (22) of the protective cover (2), the sensor (1) has a detection end (100) for detecting pressure, the detection end (100) is accommodated in the receiving groove (20), and the protective cover (2) is further provided with a liquid inlet channel (21), the liquid inlet channel (21) is opened at the side surface (23) of the protective cover (2), and the liquid inlet channel (21) is connected to the receiving groove (20).

2. The pressure sensing device according to claim 1, characterized in that: The depth direction of the accommodating groove (20) is perpendicular to the bottom surface (22) of the protective cover (2).

3. The pressure sensing device according to claim 1, characterized in that: The extension direction of the liquid inlet channel (21) is parallel to the bottom surface (22) of the protective cover (2).

4. The pressure sensing device according to claim 1, characterized in that: The sensor (1) comprises a detection chip (10), a protective tube (11) and a wire (12); the detection chip (10) is fixedly connected to an inner wall (111) of the protective tube (11); and the wire (12) is partially accommodated in the protective tube (11) and is electrically connected to the detection chip (10).

5. The pressure sensing device according to claim 4, characterized in that: The detection end (100) is a part of the detection chip (10), and the detection end (100) is exposed outside the port (110) of the protection tube (11) or is flush with the port (110) of the protection tube (11).

6. The pressure sensing device according to claim 4, characterized in that: The detection chip (10) is fixedly connected to the inner wall (111) of the protection tube (11).

7. The pressure sensing device according to claim 4, characterized in that: The protection tube (11) is cylindrical, the receiving groove (20) is matched with the protection tube (11), and the distance between the outer wall (112) of the protection tube (11) and the inner wall (200) forming the receiving groove (20) is 0.05-0.09 mm.

8. The pressure sensing device according to claim 4, characterized in that: The protection tube (11) is fixedly connected to the protection sleeve (2) at its outer wall (112) and close to the notch (202) of the containing groove (20).

9. The pressure sensing device according to claim 4, characterized in that: The detection chip (10) is spaced apart from the bottom wall (201) forming the containing groove (20).

10. The pressure sensing device according to claim 4, characterized in that: The detection chip (10) or the detection end (100) is located above or below the liquid inlet channel (21) or within the projection range of the liquid inlet channel (21) when viewed from the extension direction of the liquid inlet channel (21).

11. The pressure sensing device according to claim 1, wherein the sensor (1) is a fiber optic pressure sensor or an electronic pressure sensor.

12. The pressure sensing device according to claim 1, wherein the sensor (1) and the protective cover (2) are fixedly connected.

13. The pressure sensing device according to claim 4, wherein the outer diameter of the protection tube (11) is 0.31 mm, and the inner diameter of the containing groove (20) is 0.45 mm.

Images