Pressure sensing device

Abstract

The pressure sensing device comprises a sensor and a protective sleeve, the protective sleeve is provided with a containing groove, an opening of the containing groove is formed in the bottom face of the protective sleeve, the sensor is provided with a detection end used for detecting pressure, the detection end is contained in the containing groove, the protective sleeve is further provided with a liquid inlet channel, and the liquid inlet channel is communicated with the containing groove. An opening of the liquid inlet channel is formed in the side face of the protective sleeve, and the liquid inlet channel is communicated with the containing groove. The technical problem that splash can cause damage to the pressure sensor is solved, and the service life of the pressure sensor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to a pressure sensing device. Background Technology

[0002] Currently, pressure sensors used in medical products are typically not used alone. They are integrated into a protective sleeve (also known as the tip in endoscopes) for monitoring pressure in the bladder and / or renal pelvis during laser lithotripsy. Therefore, the protective sleeve needs to retain a fluid inlet channel to keep the fluid in the bladder and / or renal pelvis connected to the pressure sensor. Currently, the fluid inlet channel of the protective sleeve is located at the front of the sleeve or the sensor is directly mounted on the outer side. This application finds that the drawback of the existing protective sleeve is that when the laser is working, the spatter generated can splash onto the detection chip of the pressure sensor, causing damage to the pressure sensor and affecting its service life. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a pressure sensing device that solves the technical problem that spatter generated during laser operation can splash onto the detection chip of the pressure sensor, causing damage to the pressure sensor and extending its service life.

[0004] This utility model is achieved through the following technical solution:

[0005] A pressure sensing device includes a sensor and a protective sleeve. The bottom surface of the protective sleeve has a receiving groove, and the detection end of the sensor is received in the receiving groove. The protective sleeve also has a liquid inlet channel, which is located on the side of the protective sleeve and communicates with the receiving groove.

[0006] Furthermore, the sensor and the protective cover are fixedly connected.

[0007] Furthermore, the depth direction of the receiving groove is perpendicular to the bottom surface of the protective sleeve.

[0008] Furthermore, the flow direction of the liquid in the inlet channel is parallel to the bottom surface of the protective sleeve.

[0009] Furthermore, the sensor includes a detection chip, a protective tube, and a wire. The detection chip is fixedly connected to the inner wall of the protective tube, and the wire is partially housed within the protective tube and electrically connected to the detection chip.

[0010] Furthermore, the detection chip has a detection end for detecting liquid pressure, meaning that the detection end for detecting liquid pressure is part of the detection chip.

[0011] Furthermore, the detection chip is bonded to the inner wall of the protective tube with adhesive.

[0012] Furthermore, the protective tube is cylindrical, the receiving groove is adapted to the protective tube, and the distance between the outer wall of the protective tube and the inner sidewall forming the receiving groove is 0.05-0.09 mm.

[0013] Furthermore, the protective tube is fixedly connected to the receiving groove on its outer wall near the opening of the receiving groove, for example, by adhesive.

[0014] Furthermore, the detection chip is spaced apart from the bottom wall forming the receiving groove.

[0015] Furthermore, the detection chip 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).

[0016] Furthermore, the sensor (1) is an optical fiber pressure sensor or an electronic pressure sensor.

[0017] Furthermore, the outer diameter of the protective tube (11) is 0.31 mm, and the inner diameter of the receiving groove (20) is 0.45 mm.

[0018] Compared with existing technologies, the advantages of this utility model are:

[0019] By opening the liquid inlet channel on the side of the protective sleeve 2, the technical problem of the splashes generated during laser operation splashing onto the detection chip of the pressure sensor and causing damage to the sensor is solved, thus extending the service life of the pressure sensor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an optical fiber pressure sensing device according to an embodiment of the present invention.

[0021] Figure 2 This is a partial cross-sectional view of the sensor;

[0022] Figure 3 A front view of a fiber optic pressure sensing device;

[0023] Figure 4 for Figure 3 Sectional view along the middle AA;

[0024] Figure 5 for Figure 4 Enlarged view of section B;

[0025] Figure 6 for Figure 4 Enlarged view of section C;

[0026] Figure 7 This is a cross-sectional view of a fiber optic pressure sensing device according to a second embodiment of the present invention.

[0027] Figure 8 This is a cross-sectional view of a fiber optic pressure sensing device according to the third embodiment of the present invention.

[0028] Figure 9 An enlarged photograph of a damaged pressure sensor in a traditional pressure gauge.

[0029] 1. Sensor; 10. Detection chip; 100. Detection end; 11. Protective tube; 110. Port; 111. Inner wall; 112. Outer wall; 12. Wire; 2. Protective sleeve; 20. Receiving tank; 200. Inner side wall; 201. Bottom wall; 202. Slot opening; 21. Liquid inlet channel; 22. Bottom surface; 23. Side; 24. Top. Detailed Implementation

[0030] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In this description, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The term "proximal end," relative to "distal end," 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In this description, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the utility model, and should not be construed as limiting the utility model.

[0031] Currently, the liquid inlet channel of the protective sleeve of the pressure measuring mirror is located at the front of the protective sleeve (i.e., the farthest end face of the protective sleeve) or the pressure sensor is directly set on the outer side of the protective sleeve (such as in a shallow groove). The inventors of this application have found that the drawback of such a protective sleeve is that even if the diameter of the liquid inlet channel is small, generally less than 0.5 mm, or 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. This will cause damage to the pressure sensor after a slightly longer working time, affecting the pressure sensor's measurement and greatly reducing its service life.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, a pressure sensing device according to this utility model includes a sensor 1 and a protective sleeve 2. The sensor 1 and the protective sleeve 2 can be fixedly connected together by a certain fixing method (e.g., adhesive bonding). A receiving groove 20 opening is formed on the bottom surface 22 of the protective sleeve 2, and the detection end 100 of the sensor 1 is accommodated in the receiving groove 20. The protective sleeve 2 also has a liquid inlet channel 21, one end of which opens onto the side 23 of the protective sleeve 2, and the other end of which communicates with the receiving groove 20. In a specific embodiment of this utility model, liquid enters through the liquid inlet channel 21 and can directly contact the detection end 100 of the sensor 1.

[0033] The line connecting the proximal and distal ends of the protective sleeve is the axial direction of the protective sleeve, which 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 specific embodiment of this 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 disposed in the receiving groove 20 along the depth direction. In another specific embodiment of this invention, the flow direction of the liquid in the inlet channel 21, that is, the extension direction of the inlet channel, is substantially parallel to the bottom surface 22 of the protective sleeve 2. For example, the extension direction of the inlet channel is consistent with the radial direction of the protective sleeve at the opening of the inlet channel on the side of the protective sleeve, and is perpendicular to the axial direction of the protective sleeve. In yet another specific embodiment of this invention, the extension direction of the inlet channel is not perpendicular to the axial direction of the protective sleeve; the included angle between them can be acute or obtuse.

[0034] like Figure 2 As shown, 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 within 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 the pressure. The entire detection chip 10 can be located inside the protective tube 11, or the detection end 100 of the detection chip 10 can be exposed outside the port 110 of the protective tube 11 or flush with the port 110. In this embodiment, the detection end 100 of the detection chip 10 is exposed outside the port 110 of the protective tube 11 or flush with the port 110.

[0035] In another specific embodiment of this utility model, such as Figure 2As shown, the detection chip 10 and the inner wall 111 of the protection tube 11 can be bonded together with an adhesive (also commonly referred to as glue, not shown).

[0036] The protective tube 11 is generally cylindrical, and the receiving groove 20 is adapted to the protective tube 11. When the two are coaxial, the distance d between the outer wall 112 of the protective tube 11 and the inner sidewall 200 forming the receiving groove 20 is 0.05-0.09 mm. That is, 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 a 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 distance d between the outer wall 112 of the protective tube 11 and the inner sidewall 200 forming the receiving groove 20 is 0.07 mm.

[0037] like Figure 4 and Figure 6 As shown, the outer wall 112 of the protective tube 11 and the slot 202 near the receiving groove 20 can be bonded to the protective sleeve 2 with an adhesive (not shown).

[0038] like Figure 4 and Figure 5 As shown, the detection chip 10 is spaced apart from the bottom wall 201 forming the receiving groove 20. In one specific embodiment, liquid can flow to the detection end 100 of the detection chip 10. In another specific embodiment of this utility model, as... Figure 4 and Figure 5 As shown, the bottom wall 201 can be configured as an arc surface or part of a sphere with a smaller inner diameter at the distal end, 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, becoming the blind end of the receiving groove 20, that is, the receiving groove 20 has no opening at the top 24 of the protective sleeve 2.

[0039] like Figure 4 and Figure 5 As shown, the detection chip 10 is located above the liquid inlet channel 21; Figure 8 As shown, the detection chip 10 is located below the liquid inlet channel 21; Figure 7 As shown, the detection chip 10 is close to the liquid inlet channel 21, that is, when viewed from the extending direction of the liquid inlet channel 21, the detection chip 10 is located within the projection range 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 extending direction of the liquid inlet channel 21.

[0040] Traditional methods place the liquid inlet opening at the front of the protective sleeve, either at the top or by directly mounting the pressure sensor on the outer surface. This invention first identifies the drawbacks of these traditional designs. Then, to address these drawbacks, it designs a pressure-transmitting liquid inlet channel with its external opening on the side of the protective sleeve. Compared to traditional methods, this invention solves the technical problem of laser-generated spatter damaging the pressure sensor's detection surface, thus extending the sensor's lifespan.

[0041] 1. Comparison of pressure measurement experiments with front-opening pressure gauges

[0042] Four pressure gauges (numbered D1-D4) were fabricated using an 8.6Fr tip. A receiving groove was made inside the tip, with the opening 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 (0.31mm outer diameter) was placed inside. The distal end face of the pressure sensor was the pressure sensing surface, located below the front end face of the tip, and the sensing surface was sealed with zero-degree adhesive for protection.

[0043] Simultaneously, pressure measuring mirrors with side openings in the liquid inlet channel of this utility model are manufactured, wherein two mirrors are respectively located above (S1, S2), below (X1, X2), or near the liquid inlet channel (K1, K2) of the liquid inlet channel.

[0044] A lithotripsy model was constructed using a silicone kidney model, with an artificial stone (800 HU) approximately 2-4 mm in diameter placed inside. The kidney model was filled with physiological saline, with the saline bag suspended approximately 1 meter high. The water temperature was 25 degrees Celsius, and the perfusion flow rate was 40-60 ml / min. The pressure sensor was first calibrated. A laser fiber was inserted into the working channel of the tip, and a Dornier (model H30) holmium laser was used at 18 watts power and 20 Hz frequency to perform continuous lithotripsy while simultaneously monitoring the pressure.

[0045] Experimental results

[0046] The test standard is set as 30 minutes of continuous stone crushing; if the pressure gauge reading is normal, the test is considered passed.

[0047] All four pressure gauges (D1-D4) failed. Within 30 minutes, the pressure indicator showed an infinite value and could not be zeroed.

[0048] S1 and S2 both passed. Continue crushing stones, and the indicator is normal when the total time reaches 1 hour.

[0049] X1 and X2 both passed. Continue crushing the stone, and when the total time is close to 1 hour, an anomaly is indicated.

[0050] K1 and K2 both passed. Continue crushing the stone, and when the total time is close to 1 hour, an anomaly is indicated.

[0051] In addition, three mirrors (S3, S4, S5) with detection chips were installed above the liquid inlet channel. All tests passed, and the indicator was normal when the total time reached 1 hour.

[0052] Take the distal end face of the tip of the damaged mirrors D1-D4 and observe it under magnification. Figure 9 As shown in the photo, the large circular hole, only half of which is 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 center is the LED; and the small circular hole 901, located to the right of the LED, below the working channel, and slightly to the right of center of the image, is the opening of the receiving slot that houses the pressure sensor. When the pressure sensor is activated, a golden light is visible, indicating that the Fabry-Perot cavity located above the fiber optic end face, used for reflecting the laser, has been damaged and is missing.

[0053] 2. Comparison of pressure measurement experiments with sensors installed on the side.

[0054] In a lithotripsy test, five pressure gauges of a certain brand, employing electronic pressure sensors attached to the distal outer surface of the tip, were used. During five separate lithotripsy cycles ranging from 40 minutes to 2 hours, four gauges showed abnormal pressure readings. Two pressure gauges of this invention (with the detection chip located above the inlet channel) were used for two separate tests, each lasting 1-2 hours; both gauges maintained normal readings throughout. Even after being returned to the laboratory for seven days, the pressure readings of the two pressure gauges remained normal.

[0055] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A pressure sensing device, characterized in that, The device includes a sensor (1) and a protective sleeve (2). The protective sleeve (2) is provided with a receiving groove (20) which opens onto the bottom surface (22) of the protective sleeve (2). The sensor (1) has a detection end (100) for detecting pressure, which is housed in the receiving groove (20). The protective sleeve (2) is also provided with a liquid inlet channel (21) which opens onto the side surface (23) of the protective sleeve (2) and communicates with the receiving groove (20).

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

4. The pressure sensing device according to claim 1, characterized in that, 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). The wire (12) is partially housed in the protective tube (11) and electrically connected to the detection chip (10).

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

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

7. The pressure sensing device according to claim 4, characterized in that, The protective tube (11) is fixedly connected to the protective sleeve (2) at its outer wall (112) and near the slot (202) of the receiving groove (20).

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

9. The pressure sensing device according to claim 4, characterized in that, The detection chip (10) or the detection end (100) 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).

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

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

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

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