Medical perfusion pump pressure and flow monitoring device

Abstract

The invention discloses a medical perfusion pump pressure and flow monitoring device, which comprises a pressure measuring component and a sensor assembly, and is characterized in that the pressure measuring component is provided with a diaphragm mounting seat with a built-in pressure measuring base cavity, and the pressure measuring base cavity can be used for perfusate to enter and exit; two pressure measuring notches communicated with the pressure measuring base cavity are formed in the outer wall of the diaphragm mounting base in the flowing direction of perfusate, each pressure measuring notch is sealed by a pressure measuring diaphragm, and a throttling hole enabling the section of the cavity to be reduced is formed in the position, between the two pressure measuring notches, of the pressure measuring base cavity. The sensor assembly is provided with pressure sensors which are attached to the two pressure measuring diaphragms in a one-to-one correspondence mode to measure pressure, and the double-point pressure measuring design and the throttling hole pressure difference flow measuring design are combined, so that the problem of low reliability caused by single-point pressure measuring can be avoided; meanwhile, real-time flow monitoring is synchronously completed under the condition that a flow sensor does not need to be additionally carried, a doctor is finally helped to accurately control perfusion parameters, the surgical field definition is optimized, and the surgical safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of perfusion pumps, in particular to the technical field of pressure monitoring devices of perfusion pumps. Background Art

[0002] In laparoscopic surgery, the irrigation pump plays an irreplaceable role as a key equipment; it achieves pressurized expansion of the surgical area by continuously pumping sterile solutions such as saline into the surgical cavity; this pressurized expansion can not only effectively separate tissue gaps, create sufficient operating space, and form a clear visual range, but also maintain the stability of the surgical field of view; at the same time, the continuous liquid flow of the irrigation pump can also promptly flush contaminants such as blood and tissue fragments in the surgical field, keep the cavity clean, and significantly improve the doctor's observation conditions; by adjusting the perfusion parameters, the doctor can obtain the best surgical field of view clarity, which is crucial for the identification of delicate tissues, the protection of important structures, and the accuracy of surgical operations.

[0003] During the perfusion process, the accuracy and safety of liquid pressure measurement are directly related to the diagnosis and treatment effect and the life and health of patients; because the traditional contact pressure measurement method may cause liquid contamination, cross infection and sensor corrosion, more and more manufacturers choose to adopt non-contact liquid pressure measurement design in the perfusion pump (the non-contact liquid pressure measurement structure can effectively avoid the above-mentioned hidden dangers through physical isolation, providing reliable protection for clinical operation); based on this, the invention patent with announcement number CN104739520B discloses a control method for a medical perfusion pump and a system using the method; the medical perfusion pump includes an adaptive controller, a pressure detection device, a flow rate detection device, a control signal actuator and a perfusion pump, and the pressure of the perfusion point can be calculated according to the output pressure of the perfusion pump, the output flow rate of the perfusion pipeline, and the static water pressure at the output end of the perfusion pump and the perfusion pipeline, and then the perfusion pump flow rate is indirectly controlled by controlling the rotation speed of the perfusion pump through pressure feedback; however, the invention only includes a pressure monitoring device, and there is a problem of poor data reliability.

[0004] In addition, the utility model with announcement number CN219646432U also discloses an inductive monitoring device using a peristaltic pump; however, the flow monitoring data of the inductive monitoring device is calculated by the motor speed of the peristaltic pump, and there is often a difference between the theoretical calculated flow and the actual flow; in addition, its pressure measuring consumables cannot be reused. Summary of the invention

[0005] The present invention provides a pressure and flow monitoring device for a medical perfusion pump. By combining a dual-point pressure measurement design with a flow measurement design based on the pressure difference across a throttle orifice, the problem of low reliability caused by single-point pressure measurement can be avoided. At the same time, real-time flow monitoring can be synchronously completed without the need to additionally install a flow sensor. Ultimately, it helps doctors accurately control perfusion parameters, optimize the clarity of the surgical field, and improve surgical safety.

[0006] To achieve the above object, the present invention provides a pressure and flow monitoring device for a medical perfusion pump, including a pressure measurement component and a sensor assembly. The pressure measurement component has a diaphragm mounting seat with a built-in pressure measurement base cavity, and the pressure measurement base cavity is available for the perfusion liquid to flow in and out. On the outer wall of the diaphragm mounting seat and along the flow direction of the perfusion liquid, there are two pressure measurement notches communicating with the pressure measurement base cavity, and each pressure measurement notch is respectively closed by a pressure measurement diaphragm. A throttle orifice that reduces the cross-sectional area of the cavity is provided between the two pressure measurement notches in the pressure measurement base cavity. The sensor assembly has pressure sensors that are respectively in contact with and measure the pressure of the two pressure measurement diaphragms.

[0007] Preferably, the sensor assembly detachably carries two pressure sensors through a positioning seat, and the diaphragm mounting seat is detachably connected to the positioning seat.

[0008] Preferably, each pair of the pressure measurement diaphragms and the pressure sensors are respectively isolated by pressure sensing elements.

[0009] Preferably, the diaphragm mounting seat is inserted into the positioning seat along a slot. Both of the two pressure sensing elements are arranged on the same side of the slot. A screw hole is further provided on the other side of the slot relative to the side where the pressure sensing elements are arranged. The sensor assembly can use a locking mechanism screwed into the screw hole to support the diaphragm mounting seat until each pair of pressure measurement diaphragms is in contact with the pressure sensing elements.

[0010] Preferably, the two pressure sensors are respectively placed into a substrate along a base hole. On the side of the substrate facing the positioning seat and around the two pressure sensors, there are guide rings sealed by pressure sensing elements, and on the side facing away from the positioning seat, the two base holes are closed by a sealing plate. The substrate and the sealing plate are threadedly connected by fasteners, and the sealing plate is threadedly connected to the positioning seat by fasteners.

[0011] Preferably, the positioning seat has an opening for inserting two guide rings equipped with pressure sensing elements, and neither of the two pressure sensing elements protrudes from the corresponding opening.

[0012] Preferably, both of the two pressure measurement diaphragms are silicone diaphragms, the diaphragm mounting seat is a plastic seat or a stainless steel seat, and both of the two pressure sensing elements are PPSU parts.

[0013] Preferably, the diaphragm mounting base is connected to the endoscope through a first catheter at the liquid outlet. A peristaltic tube that bypasses the peristaltic device is installed at the liquid inlet of the diaphragm mounting base, and the peristaltic tube is also connected to the liquid storage container through a third catheter.

[0014] Preferably, the positioning seat has a bayonet for clamping the peristaltic tube or the third catheter.

[0015] Preferably, the first catheter and the peristaltic tube are respectively inserted into the diaphragm mounting base through pipe connectors, and the peristaltic tube and the third catheter are inserted together through a pipe connector.

[0016] Advantages of the present invention: 1) Redundant pressure monitoring design: By setting two pairs of pressure measuring diaphragms and pressure sensors, on the one hand, it can avoid direct contact between the liquid and the two pressure sensors, protect the two pressure sensors from corrosion, prevent pollution and cross-infection. On the other hand, it can also use the redundant design so that when one of the pressure sensors fails, the system can automatically use the remaining pressure sensor to continue monitoring the fluid pressure, ultimately ensuring the measurement accuracy, preventing overpressure risks, and improving the surgical effect; 2) Throttling type flow monitoring design: By setting a throttle hole that reduces the cavity cross-section between two pressure measurement points, the flow rate can be calculated by using the pressure difference generated when the liquid flows through the throttle hole, so as to realize the real-time monitoring of the liquid flow rate without additional installation of a flow sensor (saving the procurement and installation costs of the flow sensor), enabling the user to timely identify phenomena such as overpressure, pipeline blockage or pipeline leakage in the cavity and deal with them. Moreover, the structure is simple, the cost is low, there are no moving parts, and the maintenance is convenient; 3) Modular design: By making the detachable connection between the pressure measuring component with the pressure measuring diaphragm and the sensor component with the pressure sensor, and making the sensor component detachably carry two pressure sensors through the positioning seat at the same time, the faulty pressure monitoring module can be replaced separately (without repairing the whole machine), effectively reducing the maintenance cost; 4) Insertion and locking structure: By connecting the diaphragm mounting base carrying the pressure measuring diaphragm and the positioning seat carrying the pressure sensor in a plug-in manner, the assembly process can be effectively simplified, the surgical preparation time can be reduced, and since a locking mechanism is also threadedly assembled on the positioning seat, the two pressure measuring diaphragms can be made to fit the pressure sensors one by one when the locking mechanism is rotated, ensuring the accuracy of pressure measurement; 5) Diaphragm isolation design: By respectively adding pressure sensing elements between the two pairs of pressure measuring diaphragms and the pressure sensors, and making both pressure sensing elements not protrude from the installation plane where they are located, on the one hand, the two pressure sensing elements can be used to respectively provide double protection for the corresponding pressure sensors, preventing the occurrence of scratches on the pressure measurement surface, while avoiding liquid leakage to the pressure measurement part, and can also extend its own service life to a limited extent.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. Description of the Drawings

[0018] Figure 1 is a working schematic diagram of the first embodiment; Figure 2 is Figure 1 explosion schematic diagram of Figure 3 is an assembly schematic diagram of the pressure measurement component in the first embodiment; Figure 4 is a three-dimensional structural schematic diagram of the sensor assembly in the second embodiment; Figure 5 is an explosion schematic diagram of the sensor assembly in the second embodiment; In the figure: 1 - main unit, 2 - pump impeller, 3 - pressing block, 4 - pressure measurement component, 41 - pressure measurement diaphragm, 42 - diaphragm mounting seat, 5 - sensor assembly, 51 - positioning seat, 52 - pressure sensing element, 53 - locking mechanism, 54 - pressure sensor, 55 - sealing plate, 6 - third conduit, 7 - first conduit, 8 - peristaltic tube, 9 - endoscope. Detailed Embodiment

[0019] First Embodiment: Referring to Figures 1 to 3 , this embodiment includes a pressure measurement component 4 and a sensor assembly 5. The pressure measurement component 4 has a diaphragm mounting seat 42 with an internal pressure measurement base cavity, and the pressure measurement base cavity is for the perfusion liquid to flow in and out. The diaphragm mounting seat 42 is provided with two pressure measurement notches communicating with the pressure measurement base cavity on the outer wall along the flow direction of the perfusion liquid, and each pressure measurement notch is closed by a pressure measurement diaphragm 41 respectively. The pressure measurement base cavity is provided with a throttling orifice that reduces the cross-sectional area of the cavity between the two pressure measurement notches. The sensor assembly 5 has a pressure sensor 54 that is in one-to-one correspondence with and presses against the two pressure measurement diaphragms 41 for pressure measurement; wherein, the positions of the two pressure measurement diaphragms 41 are the two pressure measurement points for real-time monitoring of the liquid perfusion pressure; during pressure measurement, since the aperture of the throttling orifice is smaller than the diameter of the pressure measurement base cavity, based on Bernoulli's equation, when the perfusion liquid flows to the throttling orifice, the flow velocity will increase and the static pressure will decrease; that is to say, a pressure difference will be generated before and after the perfusion liquid flows through the throttling orifice, and the greater the fluid flow rate, the greater the generated pressure difference; at this time, the flow rate can be calculated according to the monitored pressure difference, and finally the real-time monitoring of the liquid flow rate is realized without using an additional flow sensor, with a simple structure and low cost; when the number of the pressure sensors 54 increases, the redundancy of the device structure will increase accordingly, thereby further improving the pressure measurement accuracy and reliability.

[0020] The sensor assembly 5 detachably carries two pressure sensors 54 simultaneously through the positioning seat 51, and the diaphragm mounting seat 42 is detachably connected to the positioning seat 51; this modular design enables the sensor assembly 5 to be installed on the main unit 1 as an integral component on the one hand, and on the other hand, if one of the pressure sensors 54 fails, the faulty module can be replaced separately (without repairing the whole machine).

[0021] The diaphragm mounting seat 42 is connected to the endoscope 9 through the first conduit 7 at the liquid outlet, and a peristaltic tube 8 that bypasses the peristaltic device is installed at the liquid inlet of the diaphragm mounting seat 42. The peristaltic tube 8 is also connected to the liquid storage container through the third conduit 6; wherein, the liquid storage container can be a container such as an infusion bag or an infusion bottle for containing the perfusion liquid; in addition, the peristaltic device is a common peristaltic pump on the market that realizes fluid transportation by periodically squeezing a hose (no improvement is made here, and the existing device can be used); during assembly, the peristaltic device and the sensor assembly 5 can be respectively installed on the front panel of the main unit 1.

[0022] The positioning seat 51 has a bayonet for the peristaltic tube 8 or the third conduit 6 to be snapped into.

[0023] The first conduit 7 and the peristaltic tube 8 are respectively inserted into the diaphragm mounting seat 42 through pipe joints, and the peristaltic tube 8 is inserted together with the third conduit 6 through a pipe joint; the first conduit 7, the peristaltic tube 8, and the third conduit 6 are all silicone tubes; for the peristaltic pump, during operation, it can use the pressing block 3 and the rotating pump wheel 2 to jointly squeeze the peristaltic tube 8 to make the peristaltic tube 8 close at the squeezing point, and the peristaltic tube 8 behind the squeezing point can generate negative pressure inside when restoring to its original state and suck the perfusion liquid into the tube; as the pump wheel 2 continues to rotate, the squeezing point will gradually move forward and push the fluid to flow in the direction of the outlet; in addition, the elastic closing characteristic of the peristaltic tube 8 can naturally form a check valve effect to prevent backflow; the working cooperation between the above peristaltic pump and the peristaltic tube 8 is also prior art, so it will not be elaborated here.

[0024] The working process of this embodiment: During perfusion, the perfusion liquid will flow along the route of saline bag → third conduit 6 → peristaltic tube 8 → diaphragm mounting seat 42 → first conduit 7 → endoscope 9 and finally flow into the surgical cavity under the driving action of the peristaltic device; in addition, the sensor assembly 5 can feed back the real-time measured pressure parameters to the main unit 1 for comparison with the set value; at this time, if the pressure parameter reaches the set value, the perfusion pump continues to work normally; if the pressure parameter does not reach the set value, the peristaltic speed can be adjusted by using the peristaltic device to adjust the pipeline pressure.

[0025] During the test, if the pressure of the dual sensors is very low or close to zero, it means there is a leakage point in the perfusion pipeline (i.e., the first catheter 7, the peristaltic tube 8, and the third catheter 6) or the pressure measurement base cavity; if the pressure difference between the two pressure measurement points is too large, at least one of the pressure sensors 54 fails; if the pressure difference between the two pressure measurement points is within the normal range, it proves that the internal pressure of the pressure measurement base cavity is stable; if there is no pressure difference between the two pressure measurement points, it proves that the endoscope is blocked by tissue and the internal cavity is overpressured, resulting in excessive absorption of the perfusion fluid (this may cause dilutional hyponatremia).

[0026] Embodiment 2: Refer to Figures 4 to 5 , between the two pairs of the pressure measurement diaphragms 41 and the pressure sensors 54 are respectively isolated by the pressure sensing members 52; wherein, the two pressure sensing members 52 can be isolated between the corresponding pressure measurement diaphragms 41 and the pressure sensors 54, so that on the one hand, the pressure measurement surfaces of the two pressure sensors 54 are prevented from being scratched, and on the other hand, liquid leakage to the two pressure sensors 54 can be effectively prevented.

[0027] The diaphragm mounting seat 42 is inserted into the positioning seat 51 along the slot, and the two pressure sensing members 52 are both arranged on the same side of the slot. The slot is also provided with a screw hole on the other side opposite to the side where the pressure sensing members 52 are arranged. The sensor assembly 5 can use the locking mechanism 53 screwed into the screw hole to support the diaphragm mounting seat 42 until the two pairs of pressure measurement diaphragms 41 are in contact with the pressure sensing members 52; that is to say, the locking mechanism 53 can be used to lock the pressure measurement component 4 and the sensor assembly 5 together, and at the same time, the sensing surfaces of the two pressure sensing members 52 can be in close contact with the end faces of the corresponding pressure measurement diaphragms 41 respectively, ensuring the accuracy of pressure measurement.

[0028] The two pressure sensors 54 are respectively placed into the substrate along the base holes. On the side of the substrate facing the positioning seat 51 and around the two pressure sensors 54, there are respectively guiding rings blocked by the pressure sensing members 52, and on the side of the substrate facing away from the positioning seat 51, the two base holes are closed by a sealing plate 55. The substrate and the sealing plate 55 are threadedly connected by fasteners, and the sealing plate 55 is threadedly connected to the positioning seat 51 by fasteners.

[0029] The positioning seat 51 has an opening into which the guiding rings provided with the two pressure sensing members 52 can be inserted, and the two pressure sensing members 52 do not protrude from the opening where they are located.

[0030] Both of the two pressure measuring diaphragms 41 are silicone diaphragms, the diaphragm mounting seat 42 is a plastic seat or a stainless steel seat, and both of the two pressure sensing members 52 are PPSU parts; wherein, if the pressure measuring component is a disposable pressure measuring consumable, the diaphragm mounting seat 42 is made of plastic material; if the pressure measuring component is a reusable component, the diaphragm mounting seat 42 is made of stainless steel material; when the diaphragm mounting seat 42 is a stainless steel seat, the two pressure measuring diaphragms 41 can be detachably assembled at the corresponding pressure measuring notches respectively; in order to facilitate the disassembly and assembly of the pressure measuring diaphragm 41, outwardly protruding ears can also be provided at the outer edge of the pressure measuring diaphragm 41; in addition, for the peristaltic pump, both the pump wheel 2 and the pressing block 3 can be made of stainless steel or plastic parts.

[0031] Others are the same as in Embodiment 1.

[0032] The working process of this embodiment: Before use, first, insert the diaphragm mounting seat 42 into the positioning seat 51 along the slot so that the two pairs of pressure measuring diaphragms 41 are in corresponding contact with the pressure sensing members 52; then, turn the locking mechanism 53 to push the diaphragm mounting seat 42 towards the side of the positioning seat 51 with the two pressure sensing members 52 and form a slight displacement, so that the two pressure measuring diaphragms 41 are respectively in close contact with the corresponding pressure sensing members 52, ensuring that the pipeline liquid pressure can be transmitted from the two pressure measuring diaphragms 41 to the corresponding pressure sensors 54 through the corresponding pressure sensing members 52 respectively; then, insert the first catheter 7 between the diaphragm mounting seat 42 and the endoscope; finally, insert one end of the peristaltic tube 8 into the mounting seat 42, and then insert the other end of the peristaltic tube 8 into the saline bag (liquid storage container) through the third catheter 6 after bypassing the pump wheel 2; in addition, the connection part of the peristaltic tube 8 and the third catheter 6 can also be snapped onto the positioning seat 51 along the bayonet.

[0033] The above embodiments are illustrative of the present invention, not limiting the present invention, and any simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Medical perfusion pump pressure and flow monitoring device, characterized in that: It includes a pressure measuring component (4) and a sensor assembly (5). The pressure measuring component (4) has a diaphragm mounting seat (42) with a built-in pressure measuring base cavity, and the pressure measuring base cavity allows perfusion liquid to flow in and out. On the outer wall of the diaphragm mounting seat (42) and along the flow direction of the perfusion liquid, there are two pressure measuring notches communicating with the pressure measuring base cavity, and each pressure measuring notch is respectively closed by a pressure measuring diaphragm (41). A throttling hole that reduces the cross-sectional area of the cavity is provided between the two pressure measuring notches in the pressure measuring base cavity. The sensor assembly (5) has pressure sensors (54) that are respectively and correspondingly attached to the two pressure measuring diaphragms (41) for pressure measurement.

2. The medical perfusion pump pressure and flow rate monitoring device according to claim 1, characterized in that: The sensor assembly (5) detachably carries two pressure sensors (54) simultaneously through a positioning seat (51), and the diaphragm mounting seat (42) is detachably connected to the positioning seat (51).

3. The medical perfusion pump pressure and flow rate monitoring device according to claim 2, wherein: Each pair of the pressure measuring diaphragms (41) and the pressure sensors (54) are respectively isolated by a pressure sensing member (52).

4. The medical perfusion pump pressure and flow rate monitoring device according to claim 3, characterized in that: The diaphragm mounting seat (42) is inserted into the positioning seat (51) along a slot. Both of the two pressure sensing members (52) are arranged on the same side of the slot. A screw hole is also provided on the other side of the slot opposite to the side where the pressure sensing member (52) is arranged. The sensor assembly (5) can use a locking mechanism (53) screwed into the screw hole to support the diaphragm mounting seat (42) until each pair of pressure measuring diaphragms (41) is in contact with the pressure sensing member (52).

5. The medical perfusion pump pressure and flow rate monitoring device according to claim 4, characterized in that: The two pressure sensors (54) are respectively placed into a substrate along a base hole. On the side of the substrate facing the positioning seat (51) and around the two pressure sensors (54), there are guide rings blocked by the pressure sensing members (52), and on the side facing away from the positioning seat (51), the two base holes are closed by a sealing plate (55). The substrate and the sealing plate (55) are threadedly connected by a fastener, and the sealing plate (55) is threadedly connected to the positioning seat (51) by a fastener.

6. The medical perfusion pump pressure and flow rate monitoring device according to claim 5, wherein: The positioning seat (51) has an opening for two guide rings equipped with pressure sensing members (52) to be inserted, and neither of the two pressure sensing members (52) protrudes out of the corresponding opening.

7. The medical perfusion pump pressure and flow rate monitoring device according to claim 3, characterized in that: Both of the two pressure measuring diaphragms (41) are silicone diaphragms. The diaphragm mounting seat (42) is a plastic seat or a stainless steel seat. Both of the two pressure sensing members (52) are PPSU parts.

8. The medical perfusion pump pressure and flow rate monitoring device according to any one of claims 2 to 7, characterized in that: The diaphragm mounting seat (42) is connected to an endoscope (9) through a first conduit (7) at the liquid outlet. A peristaltic tube (8) that bypasses a peristaltic device is installed at the liquid inlet of the diaphragm mounting seat (42), and the peristaltic tube (8) is also connected to a liquid storage container through a third conduit (6).

9. The medical perfusion pump pressure and flow rate monitoring device according to claim 8, characterized in that: The positioning seat (51) has a bayonet for the peristaltic tube (8) or the third conduit (6) to be clamped.

10. The medical perfusion pump pressure and flow rate monitoring device according to claim 8, characterized in that: The first conduit (7) and the peristaltic tube (8) are respectively inserted into the diaphragm mounting seat (42) through tube connectors, and the peristaltic tube (8) and the third conduit (6) are inserted together through a tube connector.

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