Finger pressing type pulse oximeter and blood oxygen detection method

Abstract

The invention discloses a shiatsu pulse oximeter and a blood oxygen detection method, and belongs to the technical field of blood oxygen detection device.The shiatsu pulse oximeter comprises a base and two shells elastically arranged on one side of the base, detection units are installed in inner cavities of the shells, a supporting rod is arranged on the base, a sliding sleeve is arranged at one end of the supporting rod, and a pressure sensor is arranged at the other end of the supporting rod; the sliding sleeve is hinged to the base; by means of the arranged driving assembly, in the process that the supporting rod is loosened to enable the shell to press the finger, the supporting rod can only deflect outwards in a one-way mode, so that when the user feels that the pressure of the shell on the finger is moderate, the supporting rod can be pressed again, the second clamping block can pop out and be matched with the clamping strip, and under the condition, the clamping strip can be clamped in the shell. The supporting rod and the base can be locked through cooperation of the first clamping block and the second clamping block, so that the shell is prevented from moving relative to fingers, an operator can complete detection under the pressure that the operator feels comfortable, and the device is suitable for people with different body feelings.

Description

Technical Field

[0001] The present invention relates to the technical field of blood oxygen detection devices, and in particular to a finger pressure type pulse oximeter and a blood oxygen detection method. Background Art

[0002] The main measurement indicators of the oximeter are pulse rate, blood oxygen saturation and perfusion index (PI). Blood oxygen saturation is one of the important basic data in clinical medicine. Blood oxygen saturation refers to the percentage of the combined oxygen capacity in the total blood volume to the total combined oxygen capacity. The finger clip oximeter does not need to collect human blood samples, but detects the current oxygen content in the blood through light penetration.

[0003] Chinese patent CN221980738U discloses an intelligent finger pressure blood oximeter, which uses ventilation holes to allow gas exchange between the gas in the external environment and the gas in the internal space of the finger detection hole, thereby allowing the sweat on the finger to evaporate to a certain extent, thereby avoiding the problem of the finger sweat affecting the detection module.

[0004] The above-mentioned device applies a force to the first clamping block and the second clamping block through the torsion spring, so that the first clamping block and the second clamping block are pressed tightly against the patient's fingers. However, a single torsion spring cannot adjust the pressure of the first clamping block and the second clamping block on the fingers. Since different people have different tolerance to pressure, the above-mentioned structure cannot make the pressure acting on the fingers in a more moderate state. In summary, the above-mentioned device still has room for improvement.

[0005] Therefore, it is necessary to provide a finger pressure pulse oximeter and a blood oxygen detection method to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a finger pressure pulse oximeter and a blood oxygen detection method to solve the problem that the existing device proposed in the above background technology applies a force to the first clamping block and the second clamping block by means of a torsion spring, so that the first clamping block and the second clamping block are pressed tightly against the patient's fingers, but the pressure of the first clamping block and the second clamping block on the fingers cannot be adjusted by a single torsion spring. Since different people have different tolerance to pressure, the pressure acting on the fingers cannot be kept in a more moderate state by the above structure.

[0007] Based on the above ideas, the present invention provides the following technical solutions: a finger pressure type pulse oximeter, comprising a base and two shells elastically arranged on one side of the base, a detection unit is installed in the inner cavity of the shell, a support rod is arranged on the base, a sliding sleeve is arranged at one end of the support rod, the sliding sleeve is hinged to the base, a collar is rotatably arranged at the end of the support rod opposite to the sliding sleeve, a sliding rod is elastically arranged at the end of the sliding sleeve close to the shell, and the sliding rod is hinged to the shell, two positioning blocks are fixedly arranged on the outer wall of the support rod, a first clamping block and a second clamping block are elastically connected to the end of the positioning block away from the support rod, an inclined surface is arranged at the end of the first clamping block and the second clamping block away from the support rod, and the inclined surface on the first clamping block is arranged opposite to the inclined surface on the second clamping block, a through slot is opened on the base at the support rod, positioning slots slidably matched with the positioning block are opened on both side walls of the inner cavity of the through slot, and a plurality of clamping strips are evenly arranged on the inner wall of the positioning slot; The collar is provided with a driving assembly that cooperates with the first block, and the end of the support rod away from the base is provided with a traction assembly that cooperates with the second block. When the two shells are close to each other, the driving assembly can cause the first block to pop out, and the cooperation between the first block and the card strip makes the two support rods move away from each other. When the pressure of the shell on the finger is moderate, the support rod is pressed and the second block is caused to pop out and cooperate with the card strip through the traction assembly, so as to lock the support rod and the base.

[0008] As a further solution of the present invention: the driving assembly includes a bevel gear sleeved on the outside of the ring, the bevel gear and the ring are connected by a one-way bearing, a bevel rack meshing with the bevel gear is fixedly arranged on the inner wall of the through groove, a cylinder is fixedly arranged on the outer wall of the ring, a counterweight block is elastically installed in the cylinder, a first limit block is elastically installed at the first clamping block on the positioning block, a first limit groove matching the first limit block is opened on the top surface of the first clamping block, and a first pull rope is fixedly arranged between the first limit block and the counterweight block.

[0009] As a further solution of the present invention: the traction assembly includes a pull ring elastically arranged at one end of the support rod away from the base, a second limit block is elastically installed on the positioning block on one side of the second clamping block, a second limit groove matching the second limit block is provided on the bottom surface of the second clamping block, a second pull rope is fixedly arranged between the second limit block and the pull ring, a boss is integrally formed at the end of the support rod away from the base, the boss is arc-shaped, an arc-shaped groove matching the pull ring is provided on the inner wall of the boss, a connected mounting hole is provided on the boss and the support rod, a tension spring is provided between the pull ring and the inner end face of the mounting hole.

[0010] As a further solution of the present invention: a slide groove is provided at one end of the base close to the shell, and two sliders are slidably arranged in the slide groove. One end of the shell close to the base is fixedly connected to the slider, and the two sliders are provided with limit springs at the ends facing away from each other, and the limit springs are arranged between the slider and the end face of the slide groove.

[0011] As a further solution of the present invention: a vertical rod is fixedly arranged in the slide groove, the vertical rod passes through the slide block and slidably cooperates with the slide block, and a limit spring is sleeved on the outside of the vertical rod.

[0012] As a further solution of the present invention: opposite sides of the two shells are both recessed inwards to form a recessed portion.

[0013] As a further solution of the present invention: pressure blocks are fixedly arranged at positions at both ends of the positioning groove, and one end of the pressure block close to the positioning block is arranged as an inclined extrusion surface.

[0014] As a further solution of the present invention: a round shaft is fixedly arranged in the through groove, and the round shaft passes through the sliding sleeve and rotates with the sliding sleeve.

[0015] As a further solution of the present invention: the positioning groove is arranged in an arc shape, and the center of the positioning groove is on the axis of the circular shaft.

[0016] A method for blood oxygen detection using the finger pressure pulse oximeter comprises the following steps: pressing a support rod so that the ends of the support rod away from the shells approach each other, thereby causing two shells on one side of the base to move away from each other; inserting a finger between the two shells, gradually releasing the support rod so that the shells gradually press the finger; when the pressure of the shells on the finger is moderate, pressing the support rod again so that the support rod and the base are locked, thereby preventing the shell from moving relative to the base.

[0017] Compared with the prior art, the beneficial effect of the present invention is that: this device, through the arrangement of the driving assembly, can only deflect outward in one direction during the process of loosening the branch rod so that the shell is pressed against the finger. Therefore, when the pressure of the shell on the finger is felt to be moderate, the branch rod can be pressed again so that the second card block can pop out and cooperate with the card strip. In this case, the support rod and the base can be locked by utilizing the cooperation between the first card block and the second card block, thereby preventing the shell from moving relative to the finger, so that the operator can complete the detection at a pressure that he feels comfortable with, which is conducive to adapting to people with different body sensations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 The present invention Figure 3 A schematic diagram of the enlarged structure at point A; Figure 5 It is a schematic diagram of the structure of the slider of the present invention; Figure 6 It is a schematic diagram of the connection structure between the support rod and the sliding sleeve of the present invention; Figure 7 The present invention Figure 6 A schematic diagram of the enlarged structure at B; Figure 8 It is a schematic diagram of the structure of the first card block and the second card block of the present invention; Fig. 9 The present invention Figure 8 A schematic diagram of the enlarged structure at C; Fig.10 It is a schematic diagram of the structure of the clamping strip and the pressing block of the present invention.

[0020] In the figure: 1, base; 101, shell; 102, through groove; 103, positioning groove; 2, support rod; 201, boss; 3, pull ring; 4, positioning block; 401, air inlet; 402, exhaust hole; 5, limit spring; 6, slider; 7, partition; 8, slide rod; 9, sleeve; 10, clamping strip; 11, pressure block; 1101, extrusion surface; 12, collar; 13, bevel gear; 14, bevel rack; 15, first pull rope; 16, cylinder; 17, counterweight; 18, second pull rope; 19, first clamping block; 20, second clamping block; 21, inclined plane; 22, support part; 23, first limit block; 24, second limit block; 25, elastic rope; 26, round shaft; 27, tension spring. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 5 As shown, a finger-pressure pulse oximeter and a blood oxygen detection method include a base 1 and two shells 101 elastically arranged on one side of the base 1, the two shells 101 are symmetrically distributed about the base 1, and the shells 101 can slide along the height direction relative to the base 1, and a detection unit for detecting heart rate and blood oxygen saturation is installed on the top wall of the inner cavity of the shell 101. Of course, this detection unit is a mature technical means in the finger-pressure blood oxygen detector, and the specific structure and working principle of the detection unit are not described in detail here.

[0022] In order to drive the housing 101 to move relative to the base 1, the present invention provides a support rod 2 at one end of the housing 101 close to the base 1. The support rod 2 can rotate relative to the base 1. The support rod 2 is provided with a sliding sleeve 9 at one end of the housing 101 close to the base 1. Figure 3-Figure 4 , Figure 6As shown, a collar 12 is sleeved on the end of the support rod 2 opposite to the sleeve 9. Specifically, the support rod 2 and the collar 12, and the sleeve 9 and the collar 12 are rotatably matched through bearings. The sleeve 9 is hinged to the base 1. A slide rod 8 is elastically mounted on the end of the sleeve 9 close to the shell 101, and the slide rod 8 is hinged to the end of the shell 101 close to the base 1. Through this structure, when the end of the support rod 2 away from the base 1 is pressed so that the ends of the two support rods 2 away from the base 1 are close to each other, the two shells 101 can move outward relative to the base 1, and the operator can insert a finger between the upper and lower shells 101 for detection.

[0023] Reference Figure 1-Figure 10 As shown, a slide groove is provided at one end of the base 1 close to the shell 101, and two sliders 6 are slidably arranged in the slide groove. A vertical rod is fixedly arranged in the slide groove, and the vertical rod passes through the slider 6 and slides with it. The end of the above-mentioned shell 101 close to the base 1 is fixedly connected to the slider 6, and a limit spring 5 is provided at the opposite ends of the two sliders 6. The limit spring 5 is arranged between the slider 6 and the end face of the slide groove, and the limit spring 5 can be sleeved on the outside of the vertical rod. Through this structure, when the operator inserts his finger between the two shells 101, the vertical rod 2 can be loosened, and the shell 101 can be driven to move downward by the action of the limit spring 5, thereby pressing the operator's finger, which can improve the stability of the overall use of the device.

[0024] In the specific use process, in order to facilitate the adjustment of the pressure applied by the housing 101 on the finger, two positioning blocks 4 are fixedly provided on the outer wall of the support rod 2. The connecting line of the two positioning blocks 4 is parallel to the width of the base 1. The end of the positioning block 4 away from the support rod 2 is elastically connected to the first card block 19 and the second card block 20. Figure 7 As shown, the ends of the first clamping block 19 and the second clamping block 20 away from the support rod 2 are both provided with an inclined surface 21, and the inclined surface 21 on the first clamping block 19 is arranged opposite to the inclined surface 21 on the second clamping block 20; The base 1 is provided with a through slot 102 at the support rod 2, and a round shaft 26 is fixedly arranged in the through slot 102. The round shaft 26 passes through the sliding sleeve 9 and rotates with the sliding sleeve 9. Through this structure, the support rod 2 and the sliding sleeve 9 can rotate in the through slot 102, thereby driving the housing 101 to move relative to the base 1; The inner wall of the through slot 102 is provided with positioning slots 103 on both sides, and the end of the positioning block 4 away from the support rod 2 is slidably arranged in the positioning slot 103. Figure 3 , Fig.10 As shown, the positioning groove 103 is set to be arc-shaped, and the center of the positioning groove 103 is on the axis of the circular shaft 26. Fig.10As shown, a plurality of clamping strips 10 are evenly arranged on a side surface of the positioning groove 103 opposite to the positioning block 4, and pressure blocks 11 are fixedly arranged at both ends of the positioning groove 103, and one end of the pressure block 11 close to the positioning block 4 is set as an inclined extrusion surface 1101. Through this structure, when the first clamping block 19 pops out and cooperates with the clamping strip 10, the two support rods 2 can only deflect in a direction away from each other, so that the two shells 101 can only approach each other, and when the second clamping block 20 pops out and cooperates with the clamping strip 10, the two support rods 2 can only deflect in a direction close to each other, so that the two shells 101 can only move away from each other; The collar 12 is provided with a driving assembly that cooperates with the first clamping block 19, and the end of the support rod 2 away from the base 1 is provided with a traction assembly that cooperates with the second clamping block 20. In actual use, when the two shells 101 are close to each other and clamp the fingers, the driving assembly can cause the first clamping block 19 to pop out, and the cooperation between the first clamping block 19 and the base 1 makes the two support rods 2 can only be relatively far away. Therefore, when the operator feels that the pressure of the shell 101 on the fingers is moderate, the support rod 2 can be pressed to make the two support rods 2 approach each other. In this process, the traction assembly can cause the second clamping block 20 to pop out and cooperate with the base 1, so as to lock the support rod 2 and the base 1, so that the shell 101 can remain stable relative to the base 1. At this time, the shell 101 exerts moderate pressure on the operator's fingers. In summary, this device can improve the comfort of the device when used, and can adapt to people with different body sensations.

[0025] The driving assembly includes a bevel gear 13 sleeved on the outside of the collar 12. The bevel gear 13 and the collar 12 can be connected by a one-way bearing, so that the bevel gear 13 can only drive the collar 12 to rotate in a single direction. A bevel rack 14 meshing with the bevel gear 13 is fixedly arranged on the inner wall of the through groove 102 (the bevel rack 14 can be regarded as a section cut from the bevel gear ring); The outer wall of the collar 12 is fixedly provided with a cylinder 16, Figure 4 As shown, a counterweight 17 is elastically installed in the cylinder 16, referring to Figure 8-Figure 9 As shown, a first limit block 23 is elastically installed on the positioning block 4 at the first clamping block 19, and a first limit groove matching with the first limit block 23 is opened on the top surface of the first clamping block 19, and a first pull rope 15 is fixedly arranged between the first limit block 23 and the counterweight block 17, and the first pull rope 15 passes through the ring 12, the support rod 2 and the positioning block 4 and slidably cooperates with the three. Through this structure, when the bevel gear 13 is driven to rotate by the bevel rack 14, the centrifugal force generated by the rotation of the ring 12 can be used to throw out the counterweight block 17, so that one end of the first limit block 23 is pulled out of the first limit groove by the first pull rope 15, so that the first clamping block 19 can pop out.

[0026] The above-mentioned traction assembly includes a pull ring 3 elastically arranged at one end of the support rod 2 away from the base 1, referring to Figure 8-Figure 9 As shown, a second limiting block 24 is elastically mounted on one side of the second clamping block 20 on the positioning block 4, and a second limiting groove matching the second limiting block 24 is provided on the bottom surface of the second clamping block 20. A second pull rope 18 is fixedly arranged between the second limiting block 24 and the pull ring 3. The second pull rope 18 passes through the support rod 2 and the positioning block 4 and slidably cooperates with the two. The first pull rope 15 and the second pull rope 18 are arranged along the axial direction of the support rod 2. Figure 2-Figure 3 As shown, a boss 201 is integrally formed at one end of the support rod 2 away from the base 1, and the boss 201 is arc-shaped. An arc groove matching the pull ring 3 is provided on the inner wall of the boss 201, so that the pull ring 3 is placed in the arc groove. A connecting mounting hole is provided on the boss 201 and the support rod 2, and a tension spring 27 is provided in the mounting hole. Both ends of the tension spring 27 are respectively fixed to the pull ring 3 and the inner end face of the mounting hole.

[0027] In actual use, the ends of the two support rods 2 away from the base 1 are driven to approach each other through the pull ring 3, thereby driving the housing 101 to move outward relative to the base 1, and the operator can insert a finger between the two housings 101. Since the bevel gear 13 is connected to the collar 12 through a one-way bearing, the collar 12 cannot be driven to rotate through the meshing of the bevel gear 13 and the bevel rack 14 during the above process of driving the housing 101 to move outward. When the finger is inserted between the two shells 101, the operator can gradually loosen the branch rod 2, so that the shell 101 can be driven to move downward through the limit spring 5 so that the two shells 101 are clamped on the fingers. When the operator feels that the pressure of the shell 101 on the finger is moderate, the branch rod 2 can be stopped and pressed downward again. In the process of loosening the branch rod 2, the engagement of the bevel gear 13 and the bevel rack 14 can drive the bevel gear 13 to rotate, and the bevel gear 13 can drive the ring 12 to rotate through the one-way bearing. During the rotation of the ring 12, the counterweight block 17 can be driven to move outward relative to the ring 12 under the action of centrifugal force, so that the counterweight block 17 pulls one end of the first limit block 23 out of the first limit groove through the first pull rope 15, so that the first clamping block 19 can pop out and cooperate with the clamping strip 10 in the positioning groove 103. The inclined surface 21 provided on the block 19 ensures that when the first block 19 cooperates with the card strip 10, the support rod 2 cannot deflect downward relative to the base 1. Therefore, when the operator feels that the pressure of the shell 101 on the finger is moderate and presses the support rod 2 downward again, the support rod 2 cannot deflect downward relative to the base 1. At this time, in the process of pressing the support rod 2 through the pull ring 3, the pull ring 3 can deflect relative to the boss 201, so that one end of the second limit block 24 can be pulled out of the second limit groove through the second pull rope 18, so that the second block 20 is in a pop-up state and cooperates with the card strip 10. At this point, the support rod 2 and the base 1 can be locked by the cooperation of the first block 19 and the second block 20, thereby preventing the shell 101 from moving relative to the operator's finger. At this point, the operator can perform detection under a relatively comfortable pressure.

[0028] To summarize, this device uses a drive assembly to allow the support rod 2 to deflect outward in one direction only during the process of loosening the support rod 2 so that the shell 101 is pressed against the finger. Therefore, when the pressure of the shell 101 on the finger is felt to be moderate, the support rod 2 can be pressed again so that the second card block 20 can pop out and cooperate with the card strip 10. In this case, the support rod 2 and the base 1 can be locked by the cooperation of the first card block 19 and the second card block 20, thereby preventing the shell 101 from moving relative to the finger, so that the operator can complete the detection at a pressure that he feels comfortable with, which is conducive to adapting to people with different body sensations.

[0029] like Figure 2-Figure 4 , Figure 6-Figure 10As shown, the positioning block 4 is provided with a slot for slidingly cooperating with the first clamping block 19 and the second clamping block 20, and a support portion 22 is integrally formed at the middle position of the slot on the positioning block 4, the first clamping block 19 and the second clamping block 20 are located at the upper and lower sides of the support portion 22, the first limit block 23 is located at the bottom of the support portion 22, and the second limit block 24 is located at the top position of the support portion 22, a first spring is fixedly arranged between the first clamping block 19 and the end face of the slot, and a second spring is fixedly arranged between the second clamping block 20 and the end face of the slot, the stiffness coefficient of the second spring is greater than the stiffness coefficient of the first spring, and an elastic rope 25 is fixedly arranged between the first clamping block 19 and the second clamping block 20, the elastic rope 25 is made of rubber material, and the elastic rope 25 passes through the support portion 22 and slides with the support portion 22; Furthermore, an air inlet hole 401 and an air exhaust hole 402 connected to the slot are provided on the positioning block 4. The air inlet hole 401 and the air exhaust hole 402 are located near the first clamping block 19. The aperture of the air inlet hole 401 is larger than the aperture of the air exhaust hole 402. A one-way valve can be installed at the air inlet hole 401 so that external gas can only enter the slot in one direction. The first clamping block 19 is sealed with the slot. Through this structure, when the first clamping block 19 is retracted into the slot, the gas in the slot below the support portion 22 can be discharged through the air exhaust hole 402. In actual use, after one end of the second limiting block 24 is pulled out from the second limiting groove by the second pull rope 18, the second card block 20 can pop out, so that the second card block 20 cooperates with the card strip 10, and in the process of the second card block 20 popping out, the elastic rope 25 can be tightened by the second card block 20, so that the first card block 19 can be pulled by the elastic rope 25. Since the inner diameter of the exhaust hole 402 is small, it takes a certain amount of time for the first card block 19 to retract into the slot, which causes the first card block 19 and the second card block 20 to cooperate with the card strip 10 at the same time for a period of time, thereby locking the support rod 2 and the base 1, which is beneficial to maintaining the stability of the shell 101, and with the pulling force of the elastic rope 25 on the first card block 19, the first card block 19 can finally retract into the slot, so that only the second card block 20 cooperates with the card strip 10. In this case, the support rod 2 can only deflect downward, so that the shell 101 can only move outward relative to the base 1, so , the cooperation between the second card block 20 and the card strip 10 can also maintain the stability of the shell 101. After the detection is completed, the operator can press the support rod 2 downward to drive the shell 101 away from the finger. When the support rod 2 drives the positioning block 4 to slide to the bottom end position of the positioning groove 103, the second card block 20 will contact the inclined extrusion surface 1101 on the pressing block 11, thereby re-extruding the second card block 20 into the groove. In this process, the second limit block 24 will be aligned with the second limit groove on the second card block 20, so that the second card block 20 can be locked in the groove again. When the operator's finger is moved out from between the two shells 101, the support rod 2 can be released, so that the support rod 2 deflects upward and resets. In this process, although the first card block 19 will pop out, when the first card block 19 moves to the top position of the positioning groove 103, the first card block 19 can be squeezed into the groove again by the pressing block 11, which is convenient for the next use.

[0030] Reference Figure 1 As shown, opposite sides of the two shells 101 are both recessed inwards to form a recessed portion, thereby facilitating the insertion of a finger between the two shells 101 .

[0031] Reference Figure 3 As shown, the end of the slide rod 8 away from the base 1 extends into the slide sleeve 9, and a spring is fixedly arranged between the inner end surface of the slide sleeve 9 and the slide rod 8. Figure 3 , Figure 5 As shown, a hinge seat is fixedly provided on one side of the housing 101 close to the base 1 and located at the slide rod 8, and one end of the slide rod 8 away from the slide sleeve 9 is hinged to the hinge seat.

[0032] Reference Figure 4As shown, a third spring is fixedly arranged between the inner end surface of the cylinder 16 and the counterweight block 17. In actual use, a joint can be rotatably installed at the bottom end of the counterweight block 17, so that one end of the first pull rope 15 is connected to the counterweight block 17 through the joint. The above-mentioned first pull rope 15 passes through the cylinder 16 and can slide relative to the cylinder 16.

[0033] Reference Figure 5 As shown, a partition plate 7 can be fixedly installed at the middle position of the slide groove, and the partition plate 7 is located between the upper and lower sliding blocks 6. The vertical rod passes through the partition plate 7 and is fixedly connected thereto.

[0034] Reference Fig. 9 As shown, the top surface and the bottom surface of the support portion 22 are respectively provided with grooves that slide with the first limit block 23 and the second limit block 24, and a return spring is fixedly arranged between the first limit block 23 and the end surface of the groove and between the second limit block 24 and the inner end surface of the groove.

Claims

1. A finger pressure pulse oximeter, comprising a base and two shells elastically arranged on one side of the base, a detection unit is installed in the inner cavity of the shell, a support rod is arranged on the base, a sliding sleeve is arranged at one end of the support rod, the sliding sleeve is hinged to the base, a collar is rotatably arranged at one end of the support rod opposite to the sliding sleeve, a sliding rod is elastically installed at one end of the sliding sleeve close to the shell, and the sliding rod is hinged to the shell, characterized in that: Two positioning blocks are fixedly arranged on the outer side wall of the support rod, and the end of the positioning block away from the support rod is elastically connected to the first clamping block and the second clamping block, and the ends of the first clamping block and the second clamping block away from the support rod are both provided with inclined surfaces, and the inclined surfaces on the first clamping block are arranged opposite to the inclined surfaces on the second clamping block, and a through slot is provided on the base at the support rod, and positioning slots that slide with the positioning blocks are provided on both side walls of the inner cavity of the through slot, and a plurality of clamping strips are evenly arranged on the inner wall of the positioning slot; The collar is provided with a driving assembly that cooperates with the first block, and the end of the support rod away from the base is provided with a traction assembly that cooperates with the second block. When the two shells are close to each other, the driving assembly can cause the first block to pop out, and the cooperation between the first block and the card strip makes the two support rods move away from each other. When the pressure of the shell on the finger is moderate, the support rod is pressed and the second block is caused to pop out and cooperate with the card strip through the traction assembly, so as to lock the support rod and the base.

2. A finger pressure pulse oximeter according to claim 1, characterized in that: The driving assembly includes a bevel gear sleeved on the outside of the ring, the bevel gear and the ring are connected by a one-way bearing, a bevel rack meshing with the bevel gear is fixedly arranged on the inner wall of the through groove, a cylinder is fixedly arranged on the outer wall of the ring, a counterweight block is elastically installed in the cylinder, a first limit block is elastically installed at the first clamping block on the positioning block, a first limit groove matching the first limit block is opened on the top surface of the first clamping block, and a first pull rope is fixedly arranged between the first limit block and the counterweight block.

3. A finger pressure type pulse oximeter according to claim 2, characterized in that: The traction assembly includes a pull ring elastically arranged at one end of the support rod away from the base, a second limit block is elastically installed on the positioning block on one side of the second clamping block, a second limit groove matching the second limit block is provided on the bottom surface of the second clamping block, a second pull rope is fixedly arranged between the second limit block and the pull ring, a boss is integrally formed at one end of the support rod away from the base, the boss is arc-shaped, an arc-shaped groove matching the pull ring is provided on the inner wall of the boss, a connected mounting hole is provided on the boss and the support rod, and a tension spring is provided between the pull ring and the inner end surface of the mounting hole.

4. A finger pressure type pulse oximeter according to claim 3, characterized in that: The base is provided with a slide groove at one end close to the shell, and two sliders are slidably arranged in the slide groove. The shell is fixedly connected to the slider at one end close to the base, and limit springs are arranged at the opposite ends of the two sliders, and the limit springs are arranged between the slider and the end face of the slide groove.

5. The finger pressure pulse oximeter according to claim 4, characterized in that: A vertical rod is fixedly arranged in the sliding groove, the vertical rod passes through the sliding block and slidably cooperates with the sliding block, and a limiting spring is sleeved on the outer side of the vertical rod.

6. The finger pressure pulse oximeter according to claim 1, characterized in that: The opposite sides of the two shells are both recessed inwards to form a recessed portion.

7. The finger pressure pulse oximeter according to claim 1, characterized in that: Pressing blocks are fixedly arranged at positions at both ends of the positioning groove, and one end of the pressing block close to the positioning block is arranged as an inclined extrusion surface.

8. The finger pressure pulse oximeter according to claim 1, characterized in that: A round shaft is fixedly arranged in the through groove, and the round shaft passes through the sliding sleeve and is rotatably matched with the sliding sleeve.

9. The finger pressure type pulse oximeter according to claim 8, characterized in that: The positioning groove is arranged in an arc shape, and the center of the positioning groove is on the axis of the circular shaft.

10. A method for blood oxygen detection using the finger pressure pulse oximeter as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: pressing a support rod so that the ends of the support rod away from the shells approach each other, thereby causing two shells on one side of the base to move away from each other; inserting a finger between the two shells, gradually releasing the support rod so that the shells gradually press the finger; when the pressure of the shells on the fingers is moderate, pressing the support rod again so that the support rod and the base are locked, thereby preventing the shells from moving relative to the base.

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