CN210844689U - Infusion tube pressure sensor - Google Patents
Infusion tube pressure sensor Download PDFInfo
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- CN210844689U CN210844689U CN201920993823.7U CN201920993823U CN210844689U CN 210844689 U CN210844689 U CN 210844689U CN 201920993823 U CN201920993823 U CN 201920993823U CN 210844689 U CN210844689 U CN 210844689U
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Abstract
The utility model relates to a pressure sensor for a transfusion tube, which comprises a fixed seat and an induction component arranged on the fixed seat; the fixed seat is provided with an infusion tube groove and an induction groove, the induction groove is communicated with the infusion tube groove, the infusion tube passes through the infusion tube groove, the induction component is positioned in the induction groove, and the induction component comprises an induction head, an induction arm and an induction fixed block which are connected in sequence; the response fixed block is fixed on the inner wall of response groove wherein one end, the unsettled setting of inductive head and response arm is at the response inslot, be equipped with the foil gage on the response arm, be equipped with signal output line on the foil gage, the inductive head, the response arm all with the outer wall contact of transfer line, be equipped with all with last holding surface and the under bracing face of transfer line outer wall contact on the inner wall of transfer line groove, go up the holding surface and the under bracing face all sets up along the axis direction of transfer line, go up holding surface and under bracing face branch house at the both ends in response groove. The utility model discloses can measure the pressure of the inside liquid of transfer line to reduce measuring error, belong to pressure sensor's technical field.
Description
Technical Field
The utility model relates to a pressure sensor's technical field especially relates to a transfer line pressure sensor.
Background
During the infusion process, the liquid medicine may seep into the subcutaneous part due to the random movement of the infusion part of the patient. In the case of ordinary gravity infusion, the infusion speed of the liquid is slowly reduced or even stopped along with the swelling of the infusion part and the increase of the local pressure. Generally, the infusion pump is not provided with a liquid medicine extravasation detection device, and when the liquid medicine extravasation occurs, the infusion is still continued according to a set program.
The pressure sensor used by the current infusion pump mainly comprises a cantilever type weighing sensor and a measuring head, wherein the measuring head presses an infusion tube to sense the fluid pressure in the infusion tube, and the fluid pressure is calculated and judged by a controller in the infusion pump to obtain the infusion pressure and judge whether liquid medicine is leaked. The measuring head can flatten the infusion tube, the measuring head can be pressed and deformed by the infusion tube except the pressure of liquid in the infusion tube, and the measuring head can also be pressed and deformed by the infusion tube to generate a reaction force. Since the reaction force generated by the deformation and the change of the reaction force along with time and temperature can not be accurately calculated and corrected by an internal program of the infusion controller, the reaction force can greatly influence the sensing precision of the infusion pressure sensor.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model aims at: the utility model provides an infusion tube pressure sensor, this infusion tube pressure sensor simple structure, the cost of manufacture is low, can connect the pressure that external circuit system monitoring infusion in-process produced, discovers the liquid extravasation of infusion as early as possible, alleviates the degree of infusion position swelling.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an infusion tube pressure sensor comprises a fixed seat and an induction component arranged on the fixed seat; the fixed seat is provided with an infusion tube groove and an induction groove, the induction groove is communicated with the infusion tube groove, the infusion tube passes through the infusion tube groove, the induction component is positioned in the induction groove, and the induction component comprises an induction head, an induction arm and an induction fixed block which are connected in sequence; the induction fixed block is fixed on the inner wall of one end of the induction groove, the induction head and the induction arm are arranged in the induction groove in a suspension mode, the induction arm is provided with a strain gauge, the strain gauge is provided with a signal output line, and the induction head and the induction arm are all in contact with the outer wall of the infusion tube. Put in the transfer line pipe groove when the transfer line, the transfer line can produce the deformation, and simultaneously during the transfer line was intraductal through the liquid that has certain pressure, the transfer line arm can extrude the inductive head to make the inductive arm take place to warp, and drive the bending deformation of foil gage, the bending deformation of foil gage can make the resistance of foil gage change, and the foil gage passes through signal output line and links to each other with external circuit. The external circuit can calculate the deformation of the induction arm by analyzing the resistance change of the strain gauge, and the hydrostatic pressure to which the induction head is subjected can be calculated from the deformation of the induction arm.
Be equipped with all with last holding surface and the under bracing face of transfer line outer wall contact on the inner wall of transfer line groove, go up holding surface and under bracing face and all set up along the axis direction of transfer line, go up holding surface and under bracing face separated at the both ends in response groove. The fixed seat is provided with an upper supporting surface and a lower supporting surface, the induction head is arranged between the upper supporting surface and the lower supporting surface, the upper supporting surface is separated from the induction head and the induction arm, and the lower supporting surface is separated from the induction head and the induction arm. The reaction force generated by deformation of the infusion tube mainly acts on the upper supporting surface and the lower supporting surface, so that the hydrostatic pressure inside the infusion tube mainly acts on the positions of the induction head and the induction arm, and the test result is more accurate.
Further, the method comprises the following steps: the induction head, the induction arm and the induction fixing block are sequentially arranged along the axial direction of the infusion tube. The response fixed block is installed induction head and response arm in the response inslot, and induction head and response arm take place displacement and deformation in the response inslot, and the deformation displacement volume of induction head is greater than the deformation displacement of response arm.
Further, the method comprises the following steps: the induction groove comprises a round hole and a rectangular hole; the induction head is located the downthehole circle, and response arm and response fixed block all are located the rectangle hole. The counterforce generated by deformation of the infusion tube and received by the upper supporting surface and the lower supporting surface can generate irregular change along with the change of time and temperature, the induction head and the induction arm in the induction groove are separated from the fixing seat, namely the upper supporting surface and the lower supporting surface on the fixing seat are separated from the induction head and the induction arm, the deformation of the induction head caused by the change of the irregular force can be avoided, and the calculation of hydrostatic pressure is avoided being influenced.
Further, the method comprises the following steps: the fixing seat is also provided with a supporting platform, and the supporting platform for supporting the infusion tube is positioned on the inner wall of the infusion tube groove and is arranged along the axis direction of the infusion tube. The support table can support the infusion tube, so that the infusion tube is prevented from deviating to the bottom of the infusion tube groove, and the infusion tube is always in contact with the induction head and the induction arm.
Further, the method comprises the following steps: the edge of the notch of the infusion tube groove is provided with a chamfer. The chamfer is convenient for installing the infusion tube in the infusion tube groove.
Further, the method comprises the following steps: the fixing seat is also provided with a positioning surface and a fixing surface which are mutually vertical, and the fixing surface is provided with a screw hole. The positioning surface can ensure that the infusion tube pressure sensor can be accurately positioned when being arranged in a designated place, so that the infusion tube pressure sensor is arranged at a correct position, and the screw holes can facilitate a user to fix the infusion tube pressure sensor by using screws.
In general, the utility model has the advantages as follows:
the infusion tube pressure sensor has the advantages of simple and small structure and low manufacturing cost. The pressure that the transfer line produced transmits for the foil gage through the deformation of inductive head and response arm for the resistance of foil gage changes, and the foil gage is connected with external circuit, thereby external circuit can calculate out the deflection of response arm through the resistance change of analysis foil gage, and the hydrostatic pressure that the inductive head received can be calculated to the deflection from the response arm. This transfer line pressure sensor is equipped with holding surface and bottom suspension fagging, goes up holding surface and bottom suspension fagging and can bear the most reaction force that the transfer line warp the production, lets the inside hydrostatic pressure of transfer line can more accurately act on the inductive head for the test result is more accurate. The induction arm and the induction head are arranged in the induction groove in a suspending way, and because the reaction force generated by the deformation of the infusion tube, which is received by the upper supporting surface and the lower supporting surface, can generate irregular change along with the change of time and temperature, the deformation of the induction head can be prevented from being influenced by the change of the irregular force by the aid of the suspension arrangement of the induction arm and the induction head, and the influence on the detection of hydrostatic pressure is avoided.
Drawings
Fig. 1 is a schematic diagram of the structure of the infusion tube pressure sensor and the infusion tube.
Fig. 2 is a schematic structural diagram of the fixing seat, the induction groove, the upper supporting surface, the lower supporting surface and the supporting table.
Fig. 3 is a schematic diagram of the structure of the infusion tube pressure sensor.
Fig. 4 is a graph showing a reaction force distribution generated when the infusion tube is deformed.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
To facilitate a uniform view of the various reference numbers within the drawings, reference numbers appearing in the drawings are now described collectively as follows:
1 is the fixing base, 2 is the response subassembly, 3 is the transfer line groove, 4 is the response groove, 5 is the inductive head, 6 is the response arm, 7 is the response fixed block, 8 is the foil gage, 9 is signal output line, 10 is last holding surface, 11 is the under bracing face, 12 is the round hole, 13 is the rectangular hole, 14 is the brace table, 15 is the chamfer, 16 is the locating surface, 17 is the stationary plane, 18 is the screw hole, 19 is the transfer line, 20 is the center of transfer line outer wall, 21 is the upper end of transfer line outer wall, 22 is the lower extreme of transfer line outer wall.
Referring to fig. 1, 2 and 3, an infusion tube pressure sensor includes a fixing base and an induction component mounted on the fixing base; the fixing seat is a square block, an infusion tube groove and an induction groove are arranged on the fixing seat, the infusion tube groove is U-shaped, and the infusion tube groove penetrates through the fixing seat. The induction groove is positioned on the side surface of the fixed seat and is communicated with the infusion tube groove, and the induction groove is positioned on the side surface of the fixed seat and is communicated with the infusion tube groove. The response subassembly is installed in the response inslot, lets the transfer line pass the transfer line groove and make the outer wall of transfer line and response subassembly contact in the use, and the transfer line has the pressure of liquid to pass to the response subassembly on will following the outer wall of transfer line when liquid circulation. The induction component comprises an induction head, an induction arm and an induction fixed block which are connected in sequence; the response fixed block is fixed on the inner wall of response groove wherein one end, and inductive head and the unsettled setting of response arm are at the response inslot, and when the outer wall of transfer line produced pressure to inductive head and response arm, inductive head and response arm can bending deformation (from the direction of response inslot to the fixing base outer end). The sensing arm is provided with a strain gauge, the strain gauge is provided with a signal output line, and the sensing head and the sensing arm are both contacted with the outer wall of the infusion tube. The one end of response fixed block is fixed on the inner wall in response groove, and the other end and the response arm of response fixed block are connected, and the response arm is connected with the inductive head, is fixed with the foil gage on the response arm, is connected with signal output line on the foil gage, and signal output line and external circuit are connected, and foil gage and signal output line all are located the fixing base outside, are convenient for and external circuit connects. When the transfer line has the liquid circulation, inductive head and response arm all can receive the pressure of transfer line outer wall and bending deformation, the foil gage also can warp in the time of response arm bending deformation, thereby change the resistance of foil gage, the foil gage passes through signal output line and external circuit connection, thereby external circuit can calculate out the deflection of response arm through the resistance change of analysis foil gage, the hydrostatic pressure that the inductive head received can be calculated to the deflection of following the response arm, external circuit belongs to prior art, when pressure is greater than the setting value, external circuit can work as can control the transfer pump can the automatic stop rotation, and send the warning, thereby prevent liquid exosmosis, alleviate the degree that infusion position is swollen.
Be equipped with all with last holding surface and the under bracing face of transfer line outer wall contact on the inner wall of transfer line groove, go up holding surface and under bracing face and all set up along the axis direction of transfer line, go up holding surface and under bracing face separated at the both ends in response groove. The fixed seat is provided with an upper supporting surface and a lower supporting surface, the induction head is arranged between the upper supporting surface and the lower supporting surface, the upper supporting surface is separated from the induction head and the induction arm, and the lower supporting surface is separated from the induction head and the induction arm. The upper supporting surface and the lower supporting surface can bear most of reaction force generated by deformation of the infusion tube, so that hydrostatic pressure in the infusion tube can act on the induction head more accurately, and a test result is more accurate.
The induction head, the induction arm and the induction fixing block are sequentially arranged along the axial direction of the infusion tube. The response fixed block is fixed at the response inslot wall, and inductive head and response arm all can bending deformation, and the bending deformation volume of inductive head department is the biggest.
The induction groove comprises a round hole and a rectangular hole; the induction head is located the downthehole circle, and response arm and response fixed block all are located the rectangle hole. Round hole and rectangular hole link into an organic whole, and the round hole makes inductive head and fixing base separation, and the rectangular hole makes inductive arm and fixing base separation for inductive head and inductive arm all can unsettled setting and inductive head and inductive arm all can bending deformation.
The fixing seat is also provided with a supporting platform, and the supporting platform for supporting the infusion tube is positioned on the inner wall of the infusion tube groove and is arranged along the axis direction of the infusion tube. The support table is arranged on the inner wall of the infusion tube groove and penetrates through the infusion tube groove, the support table supports the infusion tube in the testing process so that the infusion tube does not fall to the bottom of the infusion tube groove, and meanwhile, the infusion tube is guaranteed to be in contact with the induction arm and the induction head at the same height.
The edge of the notch of the infusion tube groove is provided with a chamfer. The chamfer can be convenient for the transfer line to install in the transfer line groove, puts the transfer line on the notch of transfer line groove, presses the transfer line under the guide of chamfer and just can easily install the transfer line in the transfer line groove.
The fixing seat is also provided with a positioning surface and a fixing surface which are mutually vertical, and the fixing surface is provided with a screw hole. The fixed surface is located the bottom of fixing base, and the locating surface is connected perpendicularly and is mutually perpendicular with the fixed surface. The positioning surface can be used for accurately positioning when the infusion tube pressure sensor is installed, so that the sensor is installed at the correct position, and the screw holes can be conveniently used for fixing the infusion tube pressure sensor by a user through screw connection.
Referring to fig. 1 and 4, the pressure sensor of the infusion tube is mainly used for sensing the pressure of liquid in the infusion tube, but the pressure sensor of the infusion tube cannot directly contact with the liquid, so the pressure sensor of the infusion tube can only measure the force across the infusion tube, the force applied to the pressure sensor of the infusion tube is a reaction force generated by the deformation of the infusion tube besides the static pressure generated by the liquid in the tube, the distribution rule of the reaction force is as shown in fig. 4, the distribution of the reaction force generated by the deformation of the infusion tube on the wall surface of the sensor is regular, the reaction force has a distribution rule with a small middle part and two large ends, namely, the reaction force at the upper end of the outer wall of the infusion tube and the lower end of the outer wall of the infusion tube is the largest, the reaction force at the center of the outer wall of the infusion tube is the smallest, so that the influence of the reaction, namely, the contact between the induction component and the two ends of the outer wall of the infusion tube is avoided. In order to achieve the purpose, the induction head and the induction arm are suspended in the induction groove, the induction head and the induction arm are separated from the fixed seat, the induction head and the induction arm are contacted with the place (the middle part of the infusion tube) with the minimum reaction force on the infusion tube, the place (the two ends of the outer wall of the infusion tube) with the maximum reaction force on the infusion tube is separated from the induction head and the induction arm through the induction groove, the place with the maximum reaction force generated by the deformation of the infusion tube is acted on the upper supporting surface and the lower supporting surface of the fixing seat, the testing accuracy of the pressure sensor of the infusion tube is improved, the size of the induction head is designed to be proper according to the sizes of the infusion tube and the induction groove, the error of the infusion pressure can be reduced by more than 50 percent, the accuracy of the infusion pressure of a common infusion pump product is +/-20 kPa, when the ambient temperature is 20 ℃, the total reaction force generated by the deformation of the infusion tube is equivalent to the liquid pressure in the tube of about 20-30 kPa.
The working principle of the infusion tube pressure sensor is as follows: wear the transfer line into the transfer line inslot and make inductive head and response arm all with the outer wall contact of transfer line, when the transfer line has the liquid circulation, inductive head and response arm all can receive the pressure of transfer line outer wall and bending deformation, the foil gage also can warp when responding to the arm bending deformation, thereby change the resistance of foil gage, the foil gage passes through signal output line and external circuit connection, thereby external circuit can calculate out the deflection of response arm through the resistance change of analysis foil gage, the hydrostatic pressure that the inductive head received can be calculated to the deflection of following the response arm, go up holding surface and under bracing face and can bear the reaction force that the transfer line warp the production, let the inside hydrostatic pressure of transfer line can accurately act on inductive head and response arm, make the test result more accurate. When the pressure is larger than the set value, the external circuit can automatically stop rotating when the infusion pump can be controlled, and gives an alarm, thereby preventing the liquid from leaking outwards and reducing the swelling degree of the infusion part.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (6)
1. An infusion tube pressure sensor, characterized in that: comprises a fixed seat and an induction component arranged on the fixed seat; the fixed seat is provided with an infusion tube groove and an induction groove, the induction groove is positioned on the side surface of the fixed seat and is communicated with the infusion tube groove, the infusion tube passes through the infusion tube groove, the induction component is positioned in the induction groove, and the induction component comprises an induction head, an induction arm and an induction fixed block which are sequentially connected; the induction fixing block is fixed on the inner wall of one end of the induction groove, the induction head and the induction arm are arranged in the induction groove in a hanging manner, the induction arm is provided with a strain gauge, the strain gauge is provided with a signal output line, and the induction head and the induction arm are both contacted with the outer wall of the infusion tube;
be equipped with all with last holding surface and the under bracing face of transfer line outer wall contact on the inner wall of transfer line groove, go up holding surface and under bracing face and all set up along the axis direction of transfer line, go up holding surface and under bracing face separated at the both ends in response groove.
2. An infusion line pressure transducer according to claim 1, wherein: the induction head, the induction arm and the induction fixing block are sequentially arranged along the axial direction of the infusion tube.
3. An infusion line pressure transducer according to claim 1, wherein: the induction groove comprises a round hole and a rectangular hole; the induction head is located the downthehole circle, and response arm and response fixed block all are located the rectangle hole.
4. An infusion line pressure transducer according to claim 1, wherein: the fixing seat is also provided with a supporting platform, and the supporting platform for supporting the infusion tube is positioned on the inner wall of the infusion tube groove and is arranged along the axis direction of the infusion tube.
5. An infusion line pressure transducer according to claim 1, wherein: the edge of the notch of the infusion tube groove is provided with a chamfer.
6. An infusion line pressure transducer according to claim 1, wherein: the fixing seat is also provided with a positioning surface and a fixing surface which are mutually vertical, and the fixing surface is provided with a screw hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920993823.7U CN210844689U (en) | 2019-06-28 | 2019-06-28 | Infusion tube pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920993823.7U CN210844689U (en) | 2019-06-28 | 2019-06-28 | Infusion tube pressure sensor |
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| CN210844689U true CN210844689U (en) | 2020-06-26 |
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| CN201920993823.7U Active CN210844689U (en) | 2019-06-28 | 2019-06-28 | Infusion tube pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170089A (en) * | 2019-06-28 | 2019-08-27 | 广州市便携医疗科技有限公司 | A kind of perfusion tube pressure sensor |
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2019
- 2019-06-28 CN CN201920993823.7U patent/CN210844689U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170089A (en) * | 2019-06-28 | 2019-08-27 | 广州市便携医疗科技有限公司 | A kind of perfusion tube pressure sensor |
| CN110170089B (en) * | 2019-06-28 | 2024-08-23 | 广州市大道医疗科技有限公司 | Infusion tube pressure sensor |
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