WO2021098351A1 - 一种应变片、压力传感器以及介入医疗导管 - Google Patents

一种应变片、压力传感器以及介入医疗导管 Download PDF

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Publication number
WO2021098351A1
WO2021098351A1 PCT/CN2020/114840 CN2020114840W WO2021098351A1 WO 2021098351 A1 WO2021098351 A1 WO 2021098351A1 CN 2020114840 W CN2020114840 W CN 2020114840W WO 2021098351 A1 WO2021098351 A1 WO 2021098351A1
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WIPO (PCT)
Prior art keywords
grid
sensitive
lateral
strain gauge
sensitive grid
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PCT/CN2020/114840
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English (en)
French (fr)
Inventor
沈磊
王慧
周子燕
梁波
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上海微创电生理医疗科技股份有限公司
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Application filed by 上海微创电生理医疗科技股份有限公司 filed Critical 上海微创电生理医疗科技股份有限公司
Priority to EP20890655.2A priority Critical patent/EP4024020B1/en
Priority to AU2020388742A priority patent/AU2020388742B2/en
Priority to US17/778,560 priority patent/US12025436B2/en
Publication of WO2021098351A1 publication Critical patent/WO2021098351A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/225—Measuring circuits therefor
    • G01L1/2262—Measuring circuits therefor involving simple electrical bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M2025/0001—Catheters; Hollow probes for pressure measurement
    • A61M2025/0002—Catheters; Hollow probes for pressure measurement with a pressure sensor at the distal end

Definitions

  • the present invention relates to the technical field of medical devices, in particular to a strain gauge, a pressure sensor and an interventional medical catheter.
  • the strain gauge is made by pasting a metal sensitive grid on a plastic base film.
  • a metal sensitive grid is formed by a narrow conductor zigzag arranged to form a group of parallel grid wires. When it is stretched, the sensitive grid becomes narrower and narrower. Longer, the resistance becomes larger. When it is compressed, the sensitive gate becomes thicker and shorter, and the resistance becomes smaller.
  • the strain gauge is attached to an elastic On the peripheral wall of the tube body, the elastic tube body is arranged at the proximal end of the tip electrode. When the tip electrode contacts the tissue in the body, the catheter will deform, which will cause the deformation of the elastic body and trigger the lengthening or shortening of the strain gauge sensitive grid , Causing a change in resistance, in order to carry out pressure measurement.
  • the commonly used resistance strain gauges on the market generally only have a longitudinally arranged sensitive grid, and the surface area of the grid wire is relatively large.
  • the applicant has proposed a strain gauge to realize the There are multiple longitudinal sensitive grids on the substrate, but the applicant found in actual use that this kind of strain gauge requires a certain preheating time (about 5-6 minutes) to reach a stable state, and can only be used after reaching a stable state. For pressure measurement, it not only prolongs the operation time, but also brings inconvenience to the use.
  • the purpose of the present invention is to provide a strain gauge, a pressure sensor and an interventional medical catheter.
  • the strain gauge can quickly reach a stable state, and overcome the need for a certain preheating time for the existing strain gauge to achieve stability. The problem of inconvenience to use.
  • the present invention provides a strain gauge, which includes:
  • the lateral sensitive grid is arranged on the substrate;
  • At least two non-lateral sensitive grids which are respectively arranged on the substrate and are located on both sides of the lateral sensitive grid and are electrically connected to the lateral sensitive grid;
  • the two non-transverse sensitive grids are connected by a transverse connecting line and share a grounding lead and a grounding port, and one end of the grounding lead is connected to the transverse connecting line at the middle position of the transverse connecting line, The other end of the grounding lead is connected to the grounding port; the resistance of the two non-transverse sensitive gates is the same, and is connected to one end of the two non-grounding leads with the same resistance. The other ends of the grounding leads are respectively connected to two non-grounding ports.
  • the substrate has a first direction and a second direction, the first direction is one of the length and the width direction of the substrate, and the second direction is the length of the substrate And the other in the width direction.
  • the two non-transverse sensitive grids are symmetrically arranged and arranged along a direction at a set angle to the first direction, and the lateral sensitive grids are arranged along the second direction.
  • the two non-transverse sensitive grids are longitudinal sensitive grids, the two longitudinal sensitive grids are aligned side by side and are arranged along the first direction, and the lateral sensitive grids are arranged along the second Directional arrangement; wherein the grid width of the vertical sensitive grid is aligned with the grid length of the horizontal sensitive grid, or the grid length of the vertical sensitive grid is aligned with the grid width of the horizontal sensitive grid.
  • the grid width and the grid length of each sensitive grid are the same, and the grid structure of all the sensitive grids is the same.
  • the laterally sensitive grid and the two non-laterally sensitive grids are electrically connected by the lateral connecting line, and the laterally sensitive grid and the two non-laterally sensitive grids share a common ground.
  • the laterally sensitive grid includes a lateral grid wire, and the lateral grid wire is connected to the lateral connecting line, and the connection position is close to the middle position of the lateral connecting line.
  • the ground lead includes a horizontal line segment and a vertical line segment, the horizontal line segment is connected to the horizontal connection line at a middle position of the horizontal connection line, and one end of the longitudinal line segment is connected to the horizontal line.
  • the horizontal line segment is connected, and the other end is connected to the ground port.
  • the laterally sensitive grid includes a lateral grid wire, the lateral line segment is arranged parallel to the lateral grid wire of the laterally sensitive grid, and the longitudinal line segment is connected to the lateral grid wire of the laterally sensitive grid.
  • the wires are arranged vertically.
  • the two non-laterally sensitive grids include a first non-laterally sensitive grid and a second non-laterally sensitive grid, and the first non-laterally sensitive grid and the second non-laterally sensitive grid respectively Connect the first non-grounded lead and the second non-grounded lead; one end of the lateral sensitive grid is connected to the lateral connecting line, the other end of the lateral sensitive grid is connected to a third non-grounded lead, and the third non-grounded lead
  • the lead has the same resistance value as the first non-grounded lead and the second non-grounded lead, and the third non-grounded lead is connected to a third non-grounded port.
  • the present invention also provides a pressure sensor, comprising an elastic body and any of the above-mentioned strain gauges, the strain gauge being arranged on the elastic body.
  • a plurality of hollow grooves are formed on the elastic body, and the plurality of hollow grooves extend along the circumferential direction of the elastic body, and opposite ends of each hollow groove are provided with An axial groove extending along the axial direction of the elastic body.
  • the length of the axial groove is not less than the width or length of the sensitive grid of each strain gauge, or not less than the axis of each sensitive grid on the elastic body. Upward width.
  • the present invention also provides an interventional medical catheter, which includes a distal end of the catheter, and the distal end of the catheter is provided with any one of the above-mentioned pressure sensors.
  • the strain gauge provided by the present invention includes a substrate; one lateral sensitive grid is arranged on the substrate; two non-lateral sensitive grids are respectively arranged on the substrate and respectively located on the lateral sensitive grid.
  • the two sides of the grid are electrically connected to the laterally sensitive grid; wherein, the two non-laterally sensitive grids are connected by a lateral connecting line and share a grounding lead and a grounding port, and one end of the grounding lead is connected to the The middle position of the wire is connected to the connecting wire, and the other end of the grounding lead is connected to the grounding port; the resistance of the two non-transverse sensitive gates is the same, and the resistances of the two non-transverse sensitive gates are the same, respectively.
  • the same reference numerals indicate similar components or actions.
  • the dimensions and relative positions of the components in the drawings are not necessarily drawn to scale.
  • the shapes and angles of various components are not necessarily drawn to scale, and some of these components may be arbitrarily enlarged and positioned to improve the clarity of the drawings.
  • the specific shape of the drawn member does not necessarily convey any information about the actual shape of the specific member, and is only selected to be a shape that is easy to recognize in the drawings.
  • Fig. 1 shows a schematic structural diagram of a strain gauge according to an existing embodiment
  • Figure 2 shows a schematic structural diagram of a strain gauge according to another embodiment of the prior art
  • Fig. 3 shows the circuit diagram of the Whist half-bridge of the strain gauge of Fig. 2;
  • Figure 4 shows an isometric view of a strain gauge according to an embodiment of the present invention
  • Figure 5 is a bottom view of the strain gauge shown in Figure 4.
  • Figure 6 shows an isometric view of a strain gauge according to another embodiment of the present invention.
  • Figure 7 is a bottom view of the strain gauge shown in Figure 6;
  • FIG. 8 shows a schematic structural diagram of a pressure sensor provided by an embodiment of the present invention when connected to an electrode
  • Figure 9 shows a front view of two strain gauges evenly distributed on the elastic body in the embodiment of the present invention.
  • FIG. 10 shows a three-dimensional view of two strain gauges uniformly distributed on the elastic body according to the embodiment of the present invention.
  • Fig. 11 shows a top view of a distal electrode of an interventional medical catheter according to an embodiment of the present invention.
  • proximal and distal refer to the relative position, relative position, and direction of elements or actions relative to each other from the perspective of the doctor using the product, although “proximal” and “distal” are not It is restrictive, but “proximal” usually refers to the end of the product that is close to the doctor during normal operation, and “distal” usually refers to the end that first enters the patient's body. "Axial” and “circumferential” refer to the axial direction and circumferential direction of the elastic body, respectively.
  • the strain gauge includes three sensitive grids, two vertical sensitive grids (a first vertical sensitive grid 11 and a second vertical sensitive grid 12) and a first horizontal sensitive grid 13, and the three sensitive grids are connected through a connecting line.
  • the first longitudinal sensitive grid 11 includes a first grid structure 111, a first non-ground port 112, a ground port 113, and a ground lead 115 connected to the ground port 113 (the ground lead is a grid wire and is connected to the first grid One end of the shaped structure 111 is connected by the first connecting wire 116/117) and the first non-grounded lead 114 connected to the first non-grounded port 112 (the first non-grounded lead 114 is also a grid wire, and the first grid The other end of the shaped structure 111 is connected).
  • the second longitudinal sensitive grid 12 includes a second grid structure 121, a second non-grounded port 122, a ground port 113 shared with the first longitudinal sensitive grid 11, and a ground lead 115 connected to the ground port 113 (the ground lead is connected to the One end of the two grid structures 121 is connected by a second connecting line 123/125) and a second non-grounded lead 124 connected to the second non-grounded port 122 (the second non-grounded lead 124 is connected to the other of the second grid structure 121). Connected at one end).
  • the first horizontal sensitive grid 13 includes a third grid structure 131, a third non-grounded port 132, a ground port 113 shared with the first longitudinal sensitive grid 11 and the second vertical sensitive grid 12, and a ground lead connected to the ground port 113 115 and the third non-grounded lead 134 connected to the third non-grounded port 132.
  • the grounded lead 115 and one end of the third grid structure 131 pass through part of the first connecting line 116 (as shown in FIG. 1) or through part of the The two connecting wires 125 are connected (as shown in FIG. 2 ), and the third non-grounded lead 134 is connected to the other end of the third grid structure 131.
  • the ground lead 115 connected to the ground port 113 in the prior art is drawn from the middle position between the second longitudinal sensitive grid 12 and the first lateral sensitive grid 13 (as shown in FIG. 1), or It is led out from the middle position between the first longitudinal sensitive grid 11 and the first lateral sensitive grid 13 (as shown in FIG. 2). Therefore, the resistance between the first non-grounded port 112 and the grounded port 113 is inconsistent with the resistance between the second non-grounded port 122 and the grounded port 113, which leads to the above-mentioned problem.
  • the resistance R 112-113 between the first non-grounded port 112 and the grounded port 113 the resistance of the first grid structure R 111 + the resistance of the ground lead R 115 + the first non-grounded
  • the resistance between the second non-grounded port 122 and the grounded port 113 R 122-113 the resistance of the second grid structure R 121 + the resistance of the grounding lead R 115 +Resistance R 124 of the second non-grounded lead +Resistance R 125 of the second connecting wire.
  • the grid wires and connecting wires of the existing strain gauges are connected to form a Wheatstone bridge.
  • the second connecting wire resistance R 125 is connected in series with the resistance R 121 of the second grid structure and the resistance R 131 of the third grid structure respectively, and then connected in parallel with the resistance R 111 of the first grid structure.
  • the existing strain gauges either make the grid wires of the two longitudinal sensitive grids to be inconsistent in size, or perform correction after outputting the force value at the rear end, and the design is complicated and the accuracy is not high.
  • the strain gauge needs to be preheated for 5-6 minutes to reach a stable state for measurement.
  • the time that the corresponding interventional medical catheter needs to be warmed up in the human body will also increase, which will limit the smooth use of the strain gauge on the interventional medical catheter, increase the difficulty and risk of the doctor's surgical operation, and prolong the operation. The pain suffered by the patient.
  • the present invention provides a strain gauge with higher accuracy, more stable after connecting the circuit, stronger anti-interference ability, no need for later calibration and can quickly achieve stable state.
  • the time that the catheter needs to be warmed up in the human body can be effectively shortened, the difficulty and risk of operation for doctors are reduced, and the pain suffered by the patient is also reduced.
  • the present invention provides a strain gauge, including a substrate 1, a lateral sensitive grid 13, arranged on the substrate 1, and two non-lateral sensitive grids, respectively arranged on the substrate 1. , Respectively located on both sides of the lateral sensitive grid 13 and electrically connected to the lateral sensitive grid 13.
  • the two non-transverse sensitive grids are connected by a horizontal connecting line 210 and share a grounding lead 115 and a grounding port 113, and one end of the grounding lead 115 is connected to the connecting line at the middle position of the connecting line 210.
  • the other end of the grounding lead 115 is connected to the grounding port 113;
  • the resistance of the two non-transverse sensitive gates is the same, and they are respectively connected to one end of two non-grounding leads of the same resistance,
  • the other ends of the two non-grounded leads are respectively connected to two non-grounded ports.
  • the substrate 1 has a first direction and a second direction.
  • the first direction is one of the length and width of the substrate
  • the second direction is the length and width of the substrate. another.
  • the connecting wire 210 includes a third connecting wire 211 and a fourth connecting wire 212 that are connected and electrically conductive, and the ground lead 115 extends from the connection point of the third connecting wire 211 and the fourth connecting wire 212 ( That is, the middle position of the connecting line 210) is led out, and the length of the third connecting line 211 is equal to the length of the fourth connecting line 212.
  • the laterally sensitive grid 13 and the two non-laterally sensitive grids are electrically connected by a lateral connecting line 210, and the laterally sensitive grid 13 and the two non-laterally sensitive grids share a ground lead 115 and a ground port 113.
  • the three sensitive grids share one ground port 113, and the ground lead 115 is drawn from the middle position of the connection line 210, which ensures that the resistance R 112-113 between the first non-ground port 112 and the ground port 113 is equal
  • the resistance R 122-113 between the second non-grounded port 122 and the grounded port 113 can make the strain gauge more stable after connecting to the circuit, with stronger anti-interference ability, and can quickly reach a stable state, warm-up time Greatly shortened; at the same time, it also saves the number of ground ports connected to the ground terminal of the external power supply on the strain gauge, and reduces the size of the strain gauge, thereby reducing the size of the pressure sensor and the interventional medical catheter carrying the strain gauge, which is beneficial to reduce The cost of interventional therapy and the probability of patient infection will increase the success rate of interventional therapy.
  • the length and width of the base 1 of the present invention are not greater than 2.0 mm, so that the strain gauge can be smoothly installed and used on the interventional medical catheter
  • the ground lead 115 includes a horizontal line segment 1151 and a vertical line segment 1152.
  • the horizontal line segment 1151 is connected to the connecting line at the middle position of the connecting line 210, and one end of the longitudinal line segment 1152 is connected to the horizontal line.
  • the line segment 1151 is connected, and the other end is connected to the ground port 113.
  • the horizontal line segment 1151 is arranged parallel to the horizontal grid wire of the lateral sensitive grid 13
  • the longitudinal line segment 1152 is arranged perpendicular to the horizontal grid wire of the lateral sensitive grid 13. This design method avoids misalignment.
  • the original position of the lateral sensitive grid 13 may affect the lateral sensitive grid 13 so that the lateral sensitive grid 13 is still located at a relatively central position, so that the ports of the strain gauges have a relatively suitable distance, and short circuits during welding can be avoided.
  • the position where the horizontal grid wire of the horizontal sensitive grid 13 is connected to the connecting line 210 is close to the middle position of the connecting wire 210, so that the horizontal sensitive grid 13 can also reach the non-lateral sensitive grid at the same time.
  • the stable state further improves the performance of the strain gauge.
  • the two non-lateral sensitive grids are vertical sensitive grids (the first vertical sensitive grid 11 and the second vertical sensitive grid 12).
  • the sensitive grid 11 and the second longitudinal sensitive grid 12 are aligned side by side and arranged along the first direction (that is, the longitudinal grid wires in each column extend along the first direction), and the adjacent first longitudinal sensitive grid 11 and the second longitudinal sensitive grid 11
  • a horizontal sensitive grid 13 is arranged between the sensitive grids 12, and the horizontal sensitive grid 13 is arranged along the second direction (that is, the horizontal grid wires in each row extend along the second direction); among them, two longitudinal sensitive grids
  • the grid width of the grid 11/12 is aligned with the grid length of the lateral sensitive grid 13 or the grid length of the two vertical sensitive grids 11/12 is aligned with the grid width of the lateral sensitive grid 13.
  • the embodiment of the present invention leads the ground lead 115 from the middle of the connecting wire 210 to ensure that the connecting wires on the left and right sides, that is, the third connecting wire 211
  • the length and resistance value of the fourth connecting line 212 are the same.
  • the entire strain gauge has higher accuracy and is more stable after connecting to the circuit.
  • this embodiment only requires preheating for 2-3 seconds. A stable state can be achieved, and the anti-interference ability is better.
  • the grid width and the grid length of each sensitive grid on the strain gauge of this embodiment are the same, and the grid structure of all sensitive grids is also the same.
  • one end of the lateral sensitive grid 13 is connected to the connecting line 210, the other end of the lateral sensitive grid 13 is connected to a third non-grounded lead 134, and the third non-grounded lead 134 is connected to the first A non-grounded lead 114 and the second non-grounded lead 124 have the same resistance value, and the third non-grounded lead 134 is connected to the third non-grounded port 132.
  • This design can make the structure of the overall strain gauge more compact and stable.
  • the stress is not necessarily along the central axis of the strain gauge, it may be inclined at a certain angle, and even the stress may deviate from the central axis of the strain gauge by 90 degrees, such as the force along the radial direction of the catheter (transverse force). ).
  • the two non-lateral sensitive grids are symmetrically arranged and are aligned with the first One direction is arranged at a set angle, and the lateral sensitive grid 13 is arranged along the second direction, so that it can measure both axial strain and lateral strain, thereby expanding the use range of strain gauges.
  • the grid wires of the two non-transverse sensitive grids on the left and right sides can be inclined at a certain angle, which is mainly used for biaxial stress measurement and analysis in unknown principal directions.
  • the inclination angle of the grid wire is 45° (that is, the angle between the grid wire and the first direction is 45°), so that the unknown stress measurement can be covered as much as possible, so that the forces in all directions can be monitored, in order to provide Give the doctor more accurate force direction information.
  • a plurality of pairs of non-lateral sensitive grids can also be arranged on the substrate, for example, 4 pairs or 6 pairs.
  • the non-lateral sensitive grids are respectively arranged symmetrically on both sides of the lateral sensitive grid so that the two sides are non-lateral
  • the sensitive gate has the same resistance value, and is connected to the horizontal sensitive gate through a horizontal connecting line and shares a grounding lead and a grounding port, which can also achieve the technical effects of the present invention, which is not limited by the present invention.
  • the substrate 1 of the present invention is a semi-rigid substrate.
  • the substrate 1 is made of semi-rigid plastic material.
  • the material of the substrate 1 is selected from one or more combinations of special polymer materials polyimide (PI) and polyether ether ketone (PEEK). More preferably, the substrate 1 is made of PEEK material, so that the substrate 1 has excellent rigidity and flexibility.
  • the present invention also provides a pressure sensor 20, as shown in FIG. 8, comprising an elastic body 21 and any of the strain gauges 10 described above, and the strain gauge 10 is arranged on the elastic body 21.
  • the elastic body 21 in this embodiment is a cylindrical hollow elastic body.
  • the elastic body 21 of this embodiment preferably has at least two hollow grooves 22 cut along the circumferential direction, and a strain gauge 10 is preferably provided between the opposite ends of each hollow groove 22.
  • the two hollow grooves 22 are located on different circumferences and are staggered along the circumferential direction (that is, staggered along the axial and circumferential directions).
  • an axial groove 23 is provided at opposite ends of each hollow groove 22, and the axial groove 23 extends along the axial direction of the elastic body 21.
  • the length of the axial groove 23 along the axial direction of the elastic body 21 is not less than the width or length of each sensitive grid on the strain gauge, or not less than the width of each sensitive grid in the axial direction of the elastic body 21.
  • the grid-like structure of the strain gauge 10 has the largest strain in the area corresponding to the axial groove 23. Therefore, the length of the axial groove 23 can be designed so that the axial groove 23 can be used to indicate that the strain gauge 10 is pasted at the position of maximum strain. The signal output by the strain gauge 10 is stronger, and the measurement effect is better.
  • the pressure sensor of this embodiment includes an elastic body 21 and at least two strain gauges 10, and the at least two strain gauges 10 are arranged on the outer surface of the elastic body 21 so as to be at least elastic
  • the two different positions of the body 21 sense axial and circumferential strain.
  • the at least two strain gauges 10 are located on different circumferences and are arranged staggered along the circumferential direction.
  • the orthographic projections of the two strain gauges 10 on the transverse section of the elastic body 21 are preferably evenly distributed along the circumferential direction of the elastic body 21.
  • the first strain gauge includes a substrate, two non-transverse sensitive grids, and a lateral sensitive grid.
  • the two non-transverse sensitive grids are symmetrically arranged and are at a set angle (preferably 45 °), and a lateral sensitive grid is arranged between the two non-lateral sensitive grids, and the lateral sensitive grid is arranged along the circumferential direction of the elastic body.
  • the second strain gauge includes another substrate, two longitudinal sensitive grids, and a lateral sensitive grid.
  • the two longitudinal sensitive grids are aligned side by side and are arranged along the axial direction of the elastic body, and the two longitudinal sensitive grids are adjacent to each other.
  • One of the lateral sensitive grids is arranged between the sensitive grids, and the lateral sensitive grids are arranged along the circumference of the elastic body.
  • the two strain gauges 10 attached to the elastic body 21 may be the same two first strain gauges, or the same two second strain gauges, or the first strain gauge and the second strain gauge. Combination (that is, the two strain gauges 10 can be the same or different).
  • the two strain gauges can sense the strain at two different positions on the elastic body 21, which ensures the actual measurement requirements of the contact force.
  • the design of the two strain gauges enables the axial length of the elastic body 21 to be made shorter, so that the length of the interventional medical catheter carrying the pressure sensor can be shortened correspondingly, which saves the use cost.
  • the present invention also provides an interventional medical catheter, which includes a distal end of the catheter, and the distal end of the catheter is provided with any one of the above-mentioned pressure sensors 20.
  • the interventional medical catheter also includes an electrode 30 connected to the pressure sensor 20, as shown in Figs. 8-11.
  • the pressure sensor 20 includes the aforementioned two strain gauges to sense the strain signal.
  • the common grounding lead of the strain gauges is drawn from the middle position of the connecting wire, which can ensure the wire size and the wire size of the sensitive grid on the left and right sides of the induced deformation.
  • the resistance value is also completely consistent, which makes the entire strain gauge more stable after connecting to the circuit and better anti-interference ability.
  • the size of the strain gauge of the present invention is small, thereby shortening the length of the elastic body of the pressure sensor, and at the same time reducing the size of the interventional medical catheter and reducing the use cost.

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hematology (AREA)
  • Public Health (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Anesthesiology (AREA)
  • Veterinary Medicine (AREA)
  • Pulmonology (AREA)
  • Biophysics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
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Abstract

一种应变片，包括基底（1）；横向敏感栅（13），设置在基底（1）上；至少两个非横向敏感栅（11，12），分别设置在基底（1）上、分别位于横向敏感栅（13）的两侧并与横向敏感栅（13）电性连接；其中，两个非横向敏感栅（11，12）通过横向连接线（210）相连接并共用一个接地引线（115）和接地端口（113），接地引线（115）的一端在连接线（210）的中间位置处与连接线（210）相连接，接地引线（115）的另一端与接地端口（113）相连接；两个非横向敏感栅（11，12）的阻值相同，并且分别与两根阻值相同的非接地引线（114,124）的一端相连接，两根非接地引线（114,124）的另一端分别与两个非接地端口（122,112）连接。该应变片精度更高，连接电路后更快速地达到稳定状态，抗干扰能力更强。还提供一种压力传感器以及介入医疗导管。

Description

一种应变片、压力传感器以及介入医疗导管 技术领域
本发明涉及医疗器械技术领域，特别是涉及一种应变片、压力传感器以及介入医疗导管。
背景技术
一般应变片是在塑料的基底薄膜上贴上金属敏感栅制成，一个金属敏感栅是由一条窄导体曲折排列形成一组平行栅丝形成的，当其受到拉伸时，敏感栅变窄变长，电阻变大，当其受到压缩时，敏感栅变粗变短，电阻变小。在介入式导管中，由于需要测量导管头端与体内组织接触的情况，常常需要在导管头端设置压力传感器，而应变片可用于制作此类传感器，更具体地，将应变片贴在一弹性管体的周壁上，弹性管体设置于头端电极的近端，当头端电极接触体内组织时，导管会产生形变，从而引起弹性体的形变，进而触发应变片敏感栅的变长或变短，引起电阻的变化，以此来进行压力测量。
目前市场上常用的电阻应变片一般仅具有一个纵向排布的敏感栅，且栅丝周表面积较大，为了减小应变片的尺寸，申请人曾提出一种应变片，以实现在应变片的基底上设置多个纵向敏感栅，但是申请人在实际使用过程中发现，此种应变片需要一定的预热时间(约5-6分钟)才能达到稳定的状态，在达到稳定的状态后才能用于压力测量，既延长了手术时间，也给使用带来了不便。
发明内容
针对上述现有技术的缺点，本发明的目的是提供一种应变片、压力传感器以及介入医疗导管，应变片能够很快地达到稳定状态，克服现有应变片需要一定的预热时间才能达到稳定的状态，使用不方便的问题。
为实现上述目的，本发明提供一种应变片，包括：
基底；
横向敏感栅，设置在所述基底上；
至少两个非横向敏感栅，分别设置在所述基底上且分别位于所述横向敏感栅的两侧并与所述横向敏感栅电性连接；
其中，两个所述非横向敏感栅通过横向连接线相连接并共用一个接地引线和接地端口，所述接地引线的一端在所述横向连接线的中间位置处与所述横向连接线相连接，所述接地引线的另一端与所述接地端口相连接；两个所述非横向敏感栅的阻值相同，并且与两根阻值相同的非接地引线的一端对应相连接，两根所述非接地引线的另一端分别与两个非接地端口连接。
可选的，上述应变片中，所述基底具有第一方向和第二方向，所述第一方向为所述基底的长度和宽度方向中的一个，所述第二方向为所述基底的长度和宽度方向中的另一个。
可选的，上述应变片中，二个所述非横向敏感栅对称设置且沿与所述第一方向呈设定角度的方向布置，所述横向敏感栅沿所述第二方向布置。
可选的，上述应变片中，两个所述非横向敏感栅为纵向敏感栅，二个所述纵向敏感栅并排对齐且沿所述第一方向布置，所述横向敏感栅沿所述第二方向布置；其中，所述纵向敏感栅的栅宽与所述横向敏感栅的栅长对齐，或者所述纵向敏感栅的栅长与所述横向敏感栅的栅宽对齐。
可选的，上述应变片中，每个敏感栅的栅宽和栅长相等，且所有敏感栅的栅状结构相同。
可选的，上述应变片中，所述横向敏感栅与两个所述非横向敏感栅通过所述横向连接线电性连接，且所述横向敏感栅与两个所述非横向敏感栅共用所述接地引线和所述接地端口。
可选的，上述应变片中，所述横向敏感栅包括一横栅丝，所述横栅丝与所述横向连接线连接，且连接的位置靠近所述横向连接线的中间位置。
可选的，上述应变片中，所述接地引线包括横向线段和纵向线段，所述横向线段在所述横向连接线的中间位置与所述横向连接线相连接，所述纵向线段的一端与所述横向线段连接，另一端与所述接地端口连接。
可选的，上述应变片中，所述横向敏感栅包括一横栅丝，所述横向线段与所述横向敏感栅的横栅丝平行布置，所述纵向线段与所述横向敏感栅的横 栅丝垂直布置。
可选的，上述应变片中，两个所述非横向敏感栅包括第一非横向敏感栅和第二非横向敏感栅，所述第一非横向敏感栅和所述第二非横向敏感栅分别连接第一非接地引线和第二非接地引线；所述横向敏感栅的一端连接所述横向连接线，所述横向敏感栅的另一端与第三非接地引线相连接，所述第三非接地引线与所述第一非接地引线和所述第二非接地引线的阻值相同，所述第三非接地引线与第三非接地端口连接。
进一步的，本发明还提供了一种压力传感器，包括弹性体以及上述任一所述的应变片，所述应变片设置在所述弹性体上。
可选的，上述压力传感器中，所述弹性体上开设有多个镂空槽，多个所述镂空槽沿所述弹性体的周向延伸，每个所述镂空槽的相对两端各设置有一个轴向槽，所述轴向槽沿所述弹性体的轴向延伸。
可选的，上述压力传感器中，所述轴向槽的长度不小于每个所述应变片的敏感栅的栅宽或栅长，或不小于每个所述敏感栅在所述弹性体的轴向上的宽度。
更进一步的，本发明还提供了一种介入医疗导管，包括导管远端，所述导管远端设置有上述任一项所述的压力传感器。
与现有技术相比，本发明提供的应变片，包括基底；一个横向敏感栅，设置在所述基底上；两个非横向敏感栅，分别设置在所述基底上、分别位于所述横向敏感栅的两侧并与所述横向敏感栅电性连接；其中，两个所述非横向敏感栅通过横向连接线相连接并共用一个接地引线和接地端口，所述接地引线的一端在所述连接线的中间位置处与所述连接线相连接，所述接地引线的另一端与所述接地端口相连接；两个所述非横向敏感栅的阻值相同，并且分别与两根阻值相同的非接地引线的一端相连接，两根所述非接地引线的另一端分别与两个非接地端口连接。这样的设计方案使得整个应变片精度更高，连接电路后更快速地达到稳定状态，抗干扰能力更强。对于安装有本发明应变片的压力传感器和介入医疗导管来说，可以有效缩短导管在人体内需要预热的时间，降低了医生手术操作的难度和手术风险，也减少了患者所承受的 痛苦。
附图说明
在附图中，相同的附图标记表示相似构件或动作。附图中构件的尺寸和相对位置不一定是按比例绘制的。例如，各种构件的形状和角度不一定按比例绘制的，并且这些构件中的某些构件可能被随意放大和定位以改善附图的清晰度。此外，所绘制的构件的特定形状并不一定传递关于特定构件实际形状的任何信息，仅仅选择成在附图中容易识别的形状。
图1示出了现有一实施例的应变片结构示意图；
图2示出了现有另一实施例的应变片结构示意图；
图3示出了图2应变片的惠斯特半桥电路图；
图4示出了本发明一实施例的应变片的等轴视图；
图5是图4所示的应变片的仰视图；
图6示出了本发明另一实施例的应变片的等轴视图；
图7是图6所示的应变片的仰视图；
图8示出了本发明实施例提供的压力传感器与电极相连时的结构示意图；
图9示出了本发明实施例二个应变片在弹性体上均匀分布的主视图；
图10示出了本发明实施例二个应变片在弹性体上均匀分布的立体图；
图11示出了本发明实施例介入医疗导管远端电极的俯视图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
在本申请中，“近端”和“远端”是从使用产品的医生角度来看相对于彼此的元件或动作的相对方位、相对位置、方向，尽管“近端”和“远端”并非是限制性的，但是“近端”通常指该产品在正常操作过程中靠近医生的一端，而“远端”通常是指首先进入患者体内的一端。“轴向”和“周向”分别 指弹性体的轴线方向及圆周面方向。
如图1-3所示提供了一种现有应变片的结构示意图。该应变片包括三个敏感栅，二个纵向敏感栅(第一纵向敏感栅11和第二纵向敏感栅12)和一个第一横向敏感栅13，且三个敏感栅通过连接线导通。
具体的，第一纵向敏感栅11包括第一栅状结构111、第一非接地端口112、接地端口113、与接地端口113相连的接地引线115(该接地引线是一栅丝，与第一栅状结构111的一端通过第一连接线116/117相连)以及与第一非接地端口112相连的第一非接地引线114(该第一非接地引线114亦是一根栅丝，与第一栅状结构111的另一端相连)。
第二纵向敏感栅12包括第二栅状结构121、第二非接地端口122、一个与第一纵向敏感栅11共用的接地端口113、与接地端口113相连的接地引线115(该接地引线与第二栅状结构121的一端通过第二连接线123/125相连)以及与第二非接地端口122相连的第二非接地引线124(该第二非接地引线124与第二栅状结构121的另一端相连)。
第一横向敏感栅13包括第三栅状结构131、第三非接地端口132、一个与第一纵向敏感栅11及第二纵向敏感栅12共用的接地端口113、与接地端口113相连的接地引线115以及与第三非接地端口132相连的第三非接地引线134，接地引线115与第三栅状结构131的一端通过部分的第一连接线116(如图1所示)或通过部分的第二连接线125相连(如图2所示)，第三非接地引线134与第三栅状结构131的另一端相连。
经研究发现，该种应变片在实际使用过程中，需要对感应到的值进行后端校准且需要一定的预热时间才能达到稳定的可使用状态，给使用带来了不便。因此，申请人从多方面进行研究，最终发现造成这一问题的原因与接地引线的引出位置有关。
从图中可以看出，现有技术中与接地端口113相连的接地引线115是从第二纵向敏感栅12和第一横向敏感栅13之间的中间位置引出(如图1所示)，或从第一纵向敏感栅11和第一横向敏感栅13之间的中间位置引出(如图2所示)。因此，造成了第一非接地端口112与接地端口113之间的电阻与第二 非接地端口122与接地端口113之间的电阻不一致，导致了上述问题。
具体来说，如图2所示，第一非接地端口112与接地端口113之间的电阻R 112-113＝第一栅状结构的电阻R 111+接地引线的电阻R 115+第一非接地引线的电阻R 114+第一连接线的电阻R 117；第二非接地端口122与接地端口113之间的电阻R 122-113＝第二栅状结构的电阻R 121+接地引线的电阻R 115+第二非接地引线的电阻R 124+第二连接线的电阻R 125。因接地端口113是共线端口，假设第一非接地引线的电阻R 114＝第二非接地引线的电阻R 124，为保证R 112-113＝R 122-113，则第一栅状结构的电阻R 111+第一连接线的电阻R 117＝第二栅状结构的电阻R 121+第二连接线的电阻R 125，由于第一连接线的电阻R 117明显小于第二连接线的电阻R 125，所以二个感知应变的纵向敏感栅的阻值R 111>R 121，导致二个纵向敏感栅的栅丝尺寸不能一致。如图3所示，现有应变片的各栅丝、连接线连成惠斯通桥路。此时的第二连接线电阻R 125，分别跟第二栅状结构的电阻R 121和第三栅状结构的电阻R 131串联后，再跟第一栅状结构的电阻R 111并联。
因此，现有的应变片要么将二个纵向敏感栅的栅丝制作成尺寸不一致，要么在后端力值输出后再进行校正，设计复杂且精度不高。且应变片需要预热5-6分钟才能达到稳定状态进行测量。相应地，其对应的介入医疗导管在人体内需要预热的时间也随之增加，进而会限制该应变片在介入医疗导管上的顺利使用，加大了医生的手术操作难度和手术风险，延长了患者所承受的痛苦。
为此，基于上述现有应变片所存在的技术问题，本发明提供了一种应变片，精度更高，连接电路后更加稳定，抗干扰能力更强，无需后期进行校准并能够很快地达到稳定状态。对于安装有本发明应变片的压力传感器和介入医疗导管来说，可以有效缩短导管在人体内需要预热的时间，降低了医生手术操作的难度和手术风险，也减少了患者所承受的痛苦。
如图4-7所示，本发明提供了一种应变片，包括基底1，一个横向敏感栅13，设置在所述基底1上；两个非横向敏感栅，分别设置在所述基底1上、分别位于所述横向敏感栅13的两侧并与所述横向敏感栅13电性连接。
其中，两个所述非横向敏感栅通过横向连接线210相连接并共用一个接 地引线115和接地端口113，所述接地引线115的一端在所述连接线210的中间位置处与所述连接线相连接，所述接地引线115的另一端与所述接地端口113相连接；两个所述非横向敏感栅的阻值相同，并且分别与两根阻值相同的非接地引线的一端相连接，两根所述非接地引线的另一端分别与两个非接地端口连接。
本实施例中，基底1具有第一方向和第二方向，所述第一方向为所述基底的长度和宽度方向中的一个，所述第二方向为所述基底的长度和宽度方向中的另一个。
优选的，所述连接线210包括相连接并电性导通的第三连接线211和第四连接线212，所述接地引线115从第三连接线211和第四连接线212的连接处(也即连接线210的中间位置)引出，第三连接线211的长度等于第四连接线212的长度。所述横向敏感栅13与两个所述非横向敏感栅通过横向连接线210电性连接，且所述横向敏感栅13与两个所述非横向敏感栅共用一个接地引线115和接地端口113。本发明实施例三个敏感栅共用一个接地端口113，且所述接地引线115从连接线210的中间位置引出，保证了第一非接地端口112与接地端口113之间的电阻R 112-113等同于第二非接地端口122与接地端口113之间的电阻R 122-113，因此可以使得应变片在连接电路后更加稳定，抗干扰能力更强，并能够很快地达到稳定状态，预热时间大大缩短；同时，也节省了应变片上与外部电源的接地端连接的接地端口数量，缩小了应变片的尺寸，进而减小了携带该应变片的压力传感器以及介入医疗导管的尺寸，有利于降低介入治疗的成本以及患者感染的机率，从而提升介入治疗的成功率。优选的，本发明基底1的长度和宽度均不大于2.0mm，便于应变片能够在介入医疗导管上顺利安装使用，提升了应变片的适配性。
本实施例中，接地引线115包括横向线段1151和纵向线段1152，所述横向线段1151在所述连接线210的中间位置与所述连接线相连接，所述纵向线段1152的一端与所述横向线段1151连接，另一端与所述接地端口113连接。具体的，所述横向线段1151与所述横向敏感栅13的横栅丝相平行布置，所述纵向线段1152与所述横向敏感栅13的横栅丝相垂直布置，这种设计方式 避免了对横向敏感栅13原有位置造成影响，可以使得横向敏感栅13仍然位于较居中的位置，使得应变片各端口间具有比较适合的间距，避免焊接时出现短路。
进一步地，本实施例横向敏感栅13的横栅丝与所述连接线210连接的位置靠近所述连接线210的中间位置，从而使得横向敏感栅13也能够与所述非横向敏感栅同时达到稳定状态，进一步提高应变片的使用性能。
如图4-5所示，本发明提供的一个实施例，两个所述非横向敏感栅为纵向敏感栅(第一纵向敏感栅11和第二纵向敏感栅12)，实施中，第一纵向敏感栅11和第二纵向敏感栅12并排对齐且沿所述第一方向布置(即每一列的纵栅丝沿着第一方向延伸)，且相邻的第一纵向敏感栅11和第二纵向敏感栅12之间设置有一个所述横向敏感栅13，所述横向敏感栅13沿所述第二方向布置(即每一行的横栅丝沿着第二方向延伸)；其中，二个纵向敏感栅11/12的栅宽与所述横向敏感栅13的栅长对齐，或者二个纵向敏感栅11/12的栅长与所述横向敏感栅13的栅宽对齐。
本实施例应变片的第一非接地端口112与接地端口113之间的电阻R 112-113＝第一栅状结构的电阻R 111+接地引线的电阻R 115+第一非接地引线的电阻R 114+第三连接线的电阻R 211；第二非接地端口122与接地端口113之间的电阻R 122-113＝第二栅状结构的电阻R 121+接地引线的电阻R 115+第二非接地引线的电阻R 124+第四连接线的电阻R 212。申请人研究发现连接线的电阻跟接地引线引出的位置相关，本发明实施例通过将接地引线115从连接线210正中间引出，可保证左、右二侧的连接线，即第三连接线211和第四连接线212的长度和阻值大小一致，在感应形变的第一纵向敏感栅11的栅丝阻值与第二纵向敏感栅12的栅丝阻值也完全一致的情况下，即第一栅状结构的电阻R 111＝第二栅状结构的电阻R 121时，可使得第一非接地端口112与接地端口113之间的电阻R 112-113＝第二非接地端口122与接地端口113之间的电阻R 122-113。此时，整个应变片精度更高，连接电路后更加稳定，与现有技术中应变片需要预热5-6分钟才能达到稳定状态进行测量相比，本实施例仅需预热2-3秒即可达到稳定状态，抗干扰能力更佳。
优选的，本实施例应变片上的每个敏感栅的栅宽和栅长相等，且所有敏感栅的栅状结构也相同。更进一步地，所述横向敏感栅13的一端连接所述连接线210，所述横向敏感栅13的另一端与第三非接地引线134相连接，所述第三非接地引线134与所述第一非接地引线114和所述第二非接地引线124的阻值相同，所述第三非接地引线134与第三非接地端口132连接。这样设计可以使得整体应变片的结构更紧凑和稳定。
考虑到有时应力不一定沿着应变片的中轴线方向，可能是呈一定角度倾斜，甚至应力可能跟应变片的中轴线呈90度偏差，例如为沿着导管径向方向的力(横向力)。如图6-7所示，本发明提供的另一个实施例，两个所述非横向敏感栅(第一非横向敏感栅14和第二非横向敏感栅15)对称设置且沿与所述第一方向呈设定角度的方向布置，所述横向敏感栅13沿所述第二方向布置，以使其既能够测量轴向的应变，又能测试横向的应变，从而扩大应变片的使用范围。
优选的，本实施例在前述应变片的基础上，可将左、右两侧的两个所述非横向敏感栅的栅丝呈一定角度倾斜，主要用于未知主方向双轴应力测量和分析。优选的，栅丝的倾斜角度为45°(即栅丝与第一方向的夹角为45°)，这样可以尽可能覆盖到未知的应力测量，使得各个方向的力都可以监测到，以期提供给医生更准确的受力方向信息。
本实施例第一非横向敏感栅14的非接地端口141与接地端口113之间的电阻R 141-113＝第一非横向敏感栅的栅状结构的电阻R 143+接地引线的电阻R 115+第一非横向敏感栅的非接地引线的电阻R 145+第三连接线的电阻R 211；第二非横向敏感栅15的非接地端口151与接地端口113之间的电阻R 151-113＝第二非横向敏感栅的栅状结构的电阻R 153+接地引线的电阻R 115+第二非横向敏感栅的非接地引线的电阻R 155+第四连接线的电阻R 212。
本实施例接地端口113的接地引线115也从连接线210的正中间引出，使得左、右二侧的连接线，即第三连接线211和第四连接线212的长度和阻值大小一致，从而可使得第一非接地端口141与接地端口113之间的电阻R 141-113＝第二非接地端口151与接地端口113之间的电阻R 151-113。此时，整个 应变片精度更高，预热时间短，连接电路后更加稳定。
在其他实施例中，也可以在基底上设置多个成对的非横向敏感栅，例如4对或6对，非横向敏感栅分别对称地布置于横向敏感栅的两侧且使得两边的非横向敏感栅阻值相同，并与横向敏感栅通过横向连接线相连接并共用一个接地引线和接地端口，同样可以实现本发明的技术效果，本发明对此不做限制。
本发明基底1为半刚性基底。优选的，基底1由半刚性塑料材料制成。例如，所述基底1的材料选自特种高分子材料聚酰亚胺(PI)以及聚醚醚酮(PEEK)中的一种或多种组合。更优选，所述基底1采用PEEK材料加工而成，使得基底1具有优异的刚性和柔性。
进一步的，本发明还提供了一种压力传感器20，如图8所示，包括弹性体21以及上述任一所述的应变片10，所述应变片10设置在所述弹性体21上。优选的，本实施例弹性体21为圆柱形中空弹性体。
本实施例弹性体21较佳地具有至少二个沿圆周方向切割的镂空槽22，且每个镂空槽22的相对两端之间较佳地设置有一个应变片10。二个镂空槽22位于不同的圆周上且沿周向错开分布(即沿轴向和周向错开分布)。
本实施例每个所述镂空槽22的相对两端各设置有一个轴向槽23，所述轴向槽23沿所述弹性体21的轴向延伸。优选的，该轴向槽23沿弹性体21轴向的长度不小于应变片上各敏感栅的栅宽或栅长，或不小于各敏感栅在所述弹性体21的轴向上的宽度，由于应变片10的栅状结构在对应于轴向槽23所在区域的应变最大，因此，通过轴向槽23的长度设计，可以使得轴向槽23可用于指示应变片10粘贴在应变最大位置，从而使得应变片10输出的信号更强，测量效果更好。
具体来说，如图9-10所示，本实施例压力传感器包括弹性体21和至少二个应变片10，该至少二个应变片10设置在弹性体21的外表面上，以至少在弹性体21的二个不同位置感测轴向和周向应变。该至少二个应变片10位于不同的圆周上且沿周向错开布置。二个所述应变片10在弹性体21横切面的的正投影优选沿弹性体21的周向均匀分布。
本实施例以二个应变片为例，分别是第一应变片和第二应变片。所述第一应变片包括一个基底、二个非横向敏感栅、一个横向敏感栅，二个所述非横向敏感栅对称设置且沿与所述弹性体的轴向呈设定角度(优选为45°)的方向布置，且该二个所述非横向敏感栅之间设置有一个所述横向敏感栅，所述横向敏感栅沿所述弹性体的周向布置。所述第二应变片包括另一个基底、二个纵向敏感栅和一个横向敏感栅，二个所述纵向敏感栅并排对齐且沿所述弹性体的轴向布置，且相邻二个所述纵向敏感栅之间设置一个所述横向敏感栅，所述横向敏感栅沿所述弹性体的周向布置。
具体实施中，贴于弹性体21上的二个应变片10可以是相同的两个第一应变片，或相同的两个第二应变片，也可以是第一应变片和第二应变片的组合(即二个应变片10可以相同也可以不同)。本实施例二个应变片可以感测弹性体21上二个不同位置的应变，保证了接触力的实际测量要求。且二个应变片的设计，使得弹性体21的轴向长度可以做得更短，从而，携带该压力传感器的介入医疗导管的长度相应也可以缩短，节省了使用成本。
更进一步的，本发明还提供了一种介入医疗导管，包括导管远端，所述导管远端设置上述任一所述的压力传感器20。所述介入医疗导管还包括与压力传感器20连接的电极30，如图8-11所示。本实施例中压力传感器20包括前文所述的二个应变片，以感测应变信号。
综上所述，本发明提供的应变片、压力传感器以及介入医疗导管中，应变片的共用接地引线从连接线的中间位置引出，能够保证感应形变的左右两侧的敏感栅的栅丝尺寸和阻值也是完全一致的，使得整个应变片连接电路后更加稳定，抗干扰能力更佳。对于安装了该应变片的压力传感器、介入导管来说，可以有效缩短导管在人体内需要预热的时间，降低医生的手术操作难度和手术风险，也减少了患者所承受的痛苦。另一方面本发明应变片的尺寸较小，进而缩短了压力传感器之弹性体的长度，同时也缩减了介入医疗导管的尺寸，降低了使用成本。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这 些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (14)

  1. 一种应变片，其特征在于，包括：
    基底；
    横向敏感栅，设置在所述基底上；
    至少两个非横向敏感栅，分别设置在所述基底上且分别位于所述横向敏感栅的两侧并与所述横向敏感栅电性连接；
    其中，两个所述非横向敏感栅通过横向连接线相连接并共用一个接地引线和接地端口，所述接地引线的一端在所述横向连接线的中间位置处与所述横向连接线相连接，所述接地引线的另一端与所述接地端口相连接；两个所述非横向敏感栅的阻值相同，并且与两根阻值相同的非接地引线的一端对应相连接，两根所述非接地引线的另一端分别与两个非接地端口连接。
  2. 根据权利要求1所述的应变片，其特征在于，所述基底具有第一方向和第二方向，所述第一方向为所述基底的长度和宽度方向中的一个，所述第二方向为所述基底的长度和宽度方向中的另一个。
  3. 根据权利要求2所述的应变片，其特征在于，两个所述非横向敏感栅对称设置且沿与所述第一方向呈设定角度的方向布置，所述横向敏感栅沿所述第二方向布置。
  4. 根据权利要求2所述的应变片，其特征在于，两个所述非横向敏感栅为纵向敏感栅，两个所述纵向敏感栅并排对齐且沿所述第一方向布置，所述横向敏感栅沿所述第二方向布置；其中，所述纵向敏感栅的栅宽与所述横向敏感栅的栅长对齐，或者所述纵向敏感栅的栅长与所述横向敏感栅的栅宽对齐。
  5. 根据权利要求1所述的应变片，其特征在于，每个敏感栅的栅宽和栅长相等，且所有敏感栅的栅状结构相同。
  6. 根据权利要求1所述的应变片，其特征在于，所述横向敏感栅与两个所述非横向敏感栅通过所述横向连接线电性连接，且所述横向敏感栅与两个所述非横向敏感栅共用所述接地引线和所述接地端口。
  7. 根据权利要求6所述的应变片，其特征在于，所述横向敏感栅包括一横栅丝，所述横栅丝与所述横向连接线连接，且连接的位置靠近所述横向连接线的中间位置。
  8. 根据权利要求1所述的应变片，其特征在于，所述接地引线包括横向线段和纵向线段，所述横向线段在所述横向连接线的中间位置与所述横向连接线相连接，所述纵向线段的一端与所述横向线段连接，另一端与所述接地端口连接。
  9. 根据权利要求8所述的应变片，其特征在于，所述横向敏感栅包括一横栅丝，所述横向线段与所述横向敏感栅的横栅丝平行布置，所述纵向线段与所述横向敏感栅的横栅丝垂直布置。
  10. 根据权利要求1所述的应变片，其特征在于，两个所述非横向敏感栅包括第一非横向敏感栅和第二非横向敏感栅，所述第一非横向敏感栅和所述第二非横向敏感栅分别连接第一非接地引线和第二非接地引线；所述横向敏感栅的一端连接所述横向连接线，所述横向敏感栅的另一端与第三非接地引线相连接，所述第三非接地引线与所述第一非接地引线和所述第二非接地引线的阻值相同，所述第三非接地引线与第三非接地端口连接。
  11. 一种压力传感器，其特征在于，包括弹性体以及如权利要求1-10中任一项所述的应变片，所述应变片设置在所述弹性体上。
  12. 根据权利要求11所述的压力传感器，其特征在于，所述弹性体上开设有多个镂空槽，多个所述镂空槽沿所述弹性体的周向延伸，每个所述镂空槽的相对两端各设置有一个轴向槽，所述轴向槽沿所述弹性体的轴向延伸。
  13. 根据权利要求12所述的压力传感器，其特征在于，所述轴向槽的长度不小于每个所述应变片的敏感栅的栅宽或栅长，或不小于每个所述敏感栅在所述弹性体的轴向上的宽度。
  14. 一种介入医疗导管，包括导管远端，其特征在于，所述导管远端设置有如权利要求11-13中任一项所述的压力传感器。
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