Medical infusion pump pressure and flow monitoring device

Abstract

The present invention discloses a medical perfusion pump pressure and flow monitoring device, comprising a pressure measuring component and a sensor assembly, wherein the pressure measuring component has a diaphragm mounting seat with a built-in pressure measuring base cavity, and the pressure measuring base cavity can be used for the inflow and outflow of perfusion fluid, the diaphragm mounting seat is provided with two pressure measuring notches connected to the pressure measuring base cavity on the outer wall and along the flow direction of the perfusion fluid, and each pressure measuring notch is respectively closed by a pressure measuring diaphragm, and the pressure measuring base cavity is provided with a throttling hole between the two pressure measuring notches to reduce the cavity cross-section, and the sensor assembly has a pressure sensor that corresponds to and measures pressure with the two pressure measuring diaphragms in a one-to-one manner, and by combining a dual-point pressure measurement design with a throttling hole pressure differential flow measurement design, the problem of low reliability caused by single-point pressure measurement can be avoided, and real-time flow monitoring can be synchronously completed without the need for an additional flow sensor, ultimately helping doctors to accurately control perfusion parameters, optimize the clarity of the surgical field of view, and improve surgical safety.

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 device; 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 out 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 fine tissues, the protection of important structures, and the accuracy of surgical operations.

[0003] During the infusion process, the accuracy and safety of liquid pressure measurement are directly related to the diagnosis and treatment effect and the health of patients. Because traditional contact pressure measurement methods may cause liquid contamination, cross-infection and sensor corrosion, more and more manufacturers are choosing to adopt non-contact liquid pressure measurement designs in infusion pumps (non-contact liquid pressure measurement structures can effectively avoid the above-mentioned risks through physical isolation, providing reliable protection for clinical operations). Based on this, the invention patent with announcement number CN104739520B discloses a control method for a medical infusion pump and a system using this method. The medical infusion pump includes an adaptive controller, a pressure detection device, a flow rate detection device, a control signal actuator and an infusion pump. The pressure at the infusion point is calculated based on the output pressure of the infusion pump, the output flow rate of the infusion pipeline, and the hydrostatic pressure at the output end of the infusion pump and the infusion pipeline. The flow rate of the infusion pump is indirectly controlled by controlling the speed of the infusion pump through pressure feedback. However, this invention only includes a pressure monitoring device, which has the 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 obtained by calculating the speed of the peristaltic pump motor, and there is often a difference between the theoretical calculated flow rate and the actual flow rate; in addition, its pressure measuring consumables cannot be reused. Summary of the Invention

[0005] The present invention proposes a medical perfusion pump pressure and flow monitoring device. By combining a dual-point pressure measurement design with a throttle pressure differential flow measurement design, it can avoid the low reliability problem brought about by single-point pressure measurement. At the same time, it can simultaneously complete real-time flow monitoring without the need for additional flow sensors, ultimately helping doctors accurately control perfusion parameters, optimize the clarity of the surgical field of view, and improve surgical safety.

[0006] To achieve the above-mentioned objectives, the present invention proposes a pressure and flow monitoring device for a medical perfusion pump, comprising a pressure measuring component and a sensor assembly. The pressure measuring component has a diaphragm mounting seat with a built-in pressure measuring base cavity, and the pressure measuring base cavity can be used for the infusion fluid to enter and exit. The diaphragm mounting seat is provided with two pressure measuring notches connected to the pressure measuring base cavity on the outer wall along the flow direction of the perfusion fluid, and each pressure measuring notch is respectively closed by a pressure measuring diaphragm. The pressure measuring base cavity is provided with a throttling hole between the two pressure measuring notches to reduce the cavity cross-section. The sensor assembly has a pressure sensor that corresponds one-to-one with the two pressure measuring diaphragms for pressure measurement.

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

[0008] Preferably, each pair of the pressure measuring diaphragms and the pressure sensors are isolated from each other by a pressure sensing component.

[0009] Preferably, the diaphragm mounting seat is plugged into the positioning seat along the slot, and the two pressure sensing parts are 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 part is 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 measuring diaphragms are in contact with the pressure sensing parts.

[0010] Preferably, the two pressure sensors are respectively placed in the substrate along the base holes, the substrate is facing the positioning seat and has guide rings blocked by pressure sensing parts on the periphery of the two pressure sensors, while the two base holes are closed by a sealing plate on the side facing away from the positioning seat, 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 components, and the two pressure sensing components are not protruding from the opening.

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

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

[0014] Preferably, the positioning seat has a snap-in socket for the peristaltic tube or the third catheter to be snapped in.

[0015] Preferably, the first conduit and the peristaltic tube are respectively plugged into the diaphragm mounting seat via a pipe joint, and the peristaltic tube and the third conduit are plugged into each other via a pipe joint.

[0016] Beneficial effects of the present invention:

[0017] 1) Redundant pressure monitoring design: By providing two pairs of pressure-measuring diaphragms and pressure sensors, the system prevents direct contact between the two pressure sensors, protecting them from corrosion, contamination, and cross-infection. Furthermore, the redundant design allows the system to automatically continue monitoring fluid pressure using the remaining pressure sensors if one pressure sensor fails, ultimately ensuring measurement accuracy, preventing overpressure risks, and improving surgical outcomes.

[0018] 2) Throttling flow monitoring design: By setting a throttling hole between two pressure measuring points to reduce the cavity cross-section, the flow rate can be calculated by using the pressure differential generated when the liquid flows through the throttling hole. This enables real-time monitoring of liquid flow without the need for additional flow sensors (saving the purchase and installation costs of flow sensors). This allows users to promptly identify and address phenomena such as overpressure in the cavity, pipeline blockage, or pipeline leakage. It also features a simple structure, low cost, no moving parts, and easy maintenance.

[0019] 3) Modular design: By detachably connecting the pressure-measuring component with the pressure-measuring diaphragm to the sensor assembly with the pressure sensor, and by allowing the sensor assembly to simultaneously detachably carry two pressure sensors via a positioning seat, a faulty pressure monitoring module can be replaced individually (without requiring complete unit repair), effectively reducing maintenance costs.

[0020] 4) Insertion and locking structure: By plugging the diaphragm mounting seat that supports the pressure measuring diaphragm and the positioning seat that supports the pressure sensor together, the assembly process can be effectively simplified and surgical preparation time can be reduced. In addition, since the positioning seat is also threaded with a locking mechanism, the two pressure measuring diaphragms can be aligned with the pressure sensor when the locking mechanism is rotated, ensuring the accuracy of pressure measurement.

[0021] 5) Diaphragm isolation design: By adding pressure sensing parts between the two pairs of pressure measuring diaphragms and the pressure sensors, and making sure that the two pressure sensing parts do not protrude from the installation plane, the two pressure sensing parts can be used to provide double protection for the corresponding pressure sensors to prevent scratches on the pressure measuring surface, avoid liquid leakage to the pressure measuring part, and extend its own service life to a limited extent.

[0022] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a working schematic diagram of Example 1;

[0024] Figure 2 yes Figure 1 Explosion diagram of

[0025] Figure 3 1 is a schematic diagram of the assembly of the pressure measuring component of the first embodiment;

[0026] Figure 4 is a schematic diagram of the three-dimensional structure of the sensor assembly of Example 2;

[0027] Figure 5 is an exploded schematic diagram of the sensor assembly of Example 2;

[0028] In the figure: 1-main unit, 2-pump wheel, 3-pressure block, 4-pressure measuring component, 41-pressure measuring 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 catheter, 7-first catheter, 8-peristaltic tube, 9-endoscope. DETAILED DESCRIPTION

[0029] Example 1:

[0030] See Figures 1 to 3This embodiment 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 can be used for the inflow and outflow of perfusion liquid. The diaphragm mounting seat 42 is provided with two pressure measuring notches connected to the pressure measuring base cavity on the outer wall and along the flow direction of the perfusion liquid, and each pressure measuring notch is closed by a pressure measuring diaphragm 41. The pressure measuring base cavity is provided with a throttle hole between the two pressure measuring notches to reduce the cavity cross-section. The sensor assembly 5 has a pressure sensor 54 that corresponds to the two pressure measuring diaphragms 41 for pressure measurement; wherein, the positions of the two pressure measuring diaphragms 41 are two for real-time monitoring of liquid The pressure measuring point of the perfusion pressure; during the pressure measurement, since the aperture of the throttle hole is smaller than the diameter of the pressure measuring base cavity, based on the Bernoulli equation, the perfusion fluid will experience an increase in flow rate and a decrease in static pressure when flowing to the throttle hole; that is, a pressure difference will be generated before and after the perfusion fluid flows through the throttle hole, and the greater the fluid flow rate, the greater the pressure difference; at this time, the flow rate can be calculated based on the monitored pressure difference, and ultimately the real-time monitoring of the liquid flow rate is realized without the use of 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.

[0031] The sensor assembly 5 simultaneously and detachably carries two pressure sensors 54 via 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 host 1 as an integral component. On the other hand, if one of the pressure sensors 54 fails, the faulty module can be replaced separately (without the need to repair the entire machine).

[0032] The diaphragm mounting seat 42 is connected to the endoscope 9 at the liquid outlet through the first catheter 7, and the diaphragm mounting seat 42 is installed with a peristaltic tube 8 wrapped around the peristaltic device at the liquid inlet, and the peristaltic tube 8 is also connected to the liquid storage container through the third catheter 6; wherein, the liquid storage container can be a container for holding perfusion liquid such as an infusion bag or an infusion bottle; 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 host 1.

[0033] The positioning seat 51 has a snap-in socket for the peristaltic tube 8 or the third conduit 6 to be snapped in place.

[0034] The first conduit 7 and the peristaltic tube 8 are respectively plugged into the diaphragm mounting seat 42 through a pipe joint, and the peristaltic tube 8 and the third conduit 6 are plugged together 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, the pressure block 3 and the rotating pump wheel 2 can be used to squeeze the peristaltic tube 8 so that the peristaltic tube 8 is closed at the squeezing point, and the peristaltic tube 8 located behind the squeezing point can generate negative pressure inside when it returns 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 toward the outlet; in addition, the elastic closing characteristics of the peristaltic tube 8 can also naturally form a one-way valve effect to prevent backflow; the working cooperation between the above-mentioned peristaltic pump and the peristaltic tube 8 is also existing technology, so it will not be repeated.

[0035] The working process of this embodiment:

[0036] During the perfusion period, the perfusion fluid will be driven by the peristaltic device along the route of saline bag → third catheter 6 → peristaltic tube 8 → diaphragm mounting seat 42 → first catheter 7 → endoscope 9 and finally flow into the surgical cavity; in addition, the sensor component 5 can feed back the real-time measured pressure parameter to the host 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 device can be used to adjust the peristaltic speed to achieve pipeline pressure adjustment.

[0037] During the test, if the pressure of the dual sensors is very low or close to zero, it means that there is a leak point in the perfusion pipeline (i.e., the first catheter 7, the peristaltic tube 8 and the third catheter 6) or the pressure base cavity; if the pressure difference between the two pressure measuring points is too large, at least one of the pressure sensors 54 has failed; if the pressure difference between the two pressure measuring points is within the normal range, it proves that the intraluminal pressure of the pressure base cavity is stable; if there is no pressure difference between the two pressure measuring points, it proves that the endoscope is blocked by tissue, the cavity is over-pressurized, and excessive absorption of perfusion fluid (this may cause dilutional hyponatremia).

[0038] Example 2:

[0039] See Figures 4 and 5 The two pairs of pressure measuring diaphragms 41 and pressure sensors 54 are isolated from each other by pressure sensing parts 52 respectively; wherein, the two pressure sensing parts 52 can be isolated between the corresponding pressure measuring diaphragms 41 and pressure sensors 54, thereby preventing the pressure measuring surfaces of the two pressure sensors 54 from being scratched on the one hand, and effectively preventing liquid from leaking to the two pressure sensors 54 on the other hand.

[0040] The diaphragm mounting seat 42 is plugged into the positioning seat 51 along the slot, and the two pressure sensing parts 52 are arranged on the same side of the slot. The slot is also provided with a screw hole on the other side relative to the side where the pressure sensing part 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 the two pairs of pressure measuring diaphragms 41 are fitted with the pressure sensing parts 52; that is, the locking mechanism 53 can be used to lock the pressure measuring component 4 and the sensor assembly 5 together, and at the same time, the sensing surfaces of the two pressure sensing parts 52 can be tightly fitted with the end faces of the corresponding pressure measuring diaphragms 41, respectively, to ensure the accuracy of pressure measurement.

[0041] The two pressure sensors 54 are respectively placed in the substrate along the base holes. The substrate faces the side of the positioning seat 51 and is provided with a guide ring blocked by a pressure sensing component 52 on the periphery of the two pressure sensors 54, while the two base holes are closed by a sealing plate 55 on the side facing away from the positioning seat 51. 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.

[0042] The positioning seat 51 has an opening for inserting two guide rings equipped with pressure sensing elements 52 , and the two pressure sensing elements 52 are not protruding from the opening.

[0043] The two pressure measuring diaphragms 41 are both silicone diaphragms, the diaphragm mounting seat 42 is a plastic seat or a stainless steel seat, and the two pressure sensing parts 52 are both 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 also be detachably assembled at the corresponding pressure measuring notches; in order to facilitate the disassembly and assembly of the pressure measuring diaphragm 41, a protruding ear can be added to the outer edge of the pressure measuring diaphragm 41; in addition, for the peristaltic pump, the pump wheel 2 and the pressure block 3 can both be stainless steel parts or plastic parts.

[0044] Other details are the same as those in Example 1.

[0045] The working process of this embodiment:

[0046] Before use, first, insert the diaphragm mounting seat 42 into the positioning seat 51 along the slot and make the two pairs of pressure measuring diaphragms 41 fit correspondingly with the pressure sensing parts 52; then, twist the locking mechanism 53 to push the diaphragm mounting seat 42 toward the side of the positioning seat 51 with the two pressure sensing parts 52 and form a slight displacement, so that the two pressure measuring diaphragms 41 are respectively close to the corresponding pressure sensing parts 52, ensuring that the pipeline liquid pressure can be transmitted from the two pressure measuring diaphragms 41 to the corresponding pressure sensing parts 52 respectively; then, insert the first catheter 7 between the diaphragm mounting seat 42 and the endoscope; finally, plug one end of the peristaltic tube 8 into the mounting seat 42, and then plug 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 between the peristaltic tube 8 and the third catheter 6 can also be plugged into the positioning seat 51 along the bayonet.

[0047] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A medical infusion pump pressure and flow monitoring device, characterized in that: The invention comprises a pressure measuring component (4) and a sensor assembly (5), wherein 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 can be used for the inflow and outflow of perfusion liquid, and the diaphragm mounting seat (42) is provided with two pressure measuring notches connected to the pressure measuring base cavity on the outer wall and along the flow direction of the perfusion liquid, and each pressure measuring notch is respectively closed by a pressure measuring diaphragm (41), and the pressure measuring base cavity is provided with a throttle hole for reducing the cavity cross section between the two pressure measuring notches, and the sensor assembly (5) has a pressure sensor (54) for pressure measurement corresponding to the two pressure measuring diaphragms (41) in a one-to-one manner; the perfusion liquid will generate a pressure difference before and after flowing through the throttle hole, and the greater the fluid flow rate, the greater the pressure difference; the flow rate is calculated based on the monitored pressure difference; The sensor assembly (5) simultaneously and detachably carries two pressure sensors (54) via the positioning seat (51), and the diaphragm mounting seat (42) is detachably connected to the positioning seat (51); each pair of the pressure-measuring diaphragms (41) and the pressure sensors (54) are isolated from each other by the pressure-sensing components (52); the diaphragm mounting seat (42) is plugged into the positioning seat (51) along the slot, and the two pressure-sensing components (52) are arranged on the same side of the slot, and the slot is further provided with a screw hole on the other side of the slot where the pressure-sensing components (52) are 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) and the pressure-sensing components (52) are in contact with each other.

2. The medical perfusion pump pressure and flow monitoring device according to claim 1, wherein: The two pressure sensors (54) are respectively placed in the base plate along the base hole. The base plate faces the positioning seat (51) and is provided with a guide ring blocked by a pressure sensing element (52) on the periphery of the two pressure sensors (54). The two base holes are closed by a sealing plate (55) on the side facing away from the positioning seat (51). The base plate 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.

3. The medical perfusion pump pressure and flow monitoring device according to claim 2, wherein: The positioning seat (51) has an opening for inserting two guide rings equipped with pressure sensing elements (52), and the two pressure sensing elements (52) are not protruding from the opening.

4. The medical infusion pump pressure and flow monitoring device according to claim 1, wherein: The two pressure measuring diaphragms (41) are both silicone diaphragms, the diaphragm mounting seat (42) is a plastic seat or a stainless steel seat, and the two pressure sensing parts (52) are both PPSU parts.

5. The medical perfusion pump pressure and flow monitoring device according to any one of claims 1 to 4, characterized in that: The diaphragm mounting seat (42) is connected to the endoscope (9) at the liquid outlet through the first catheter (7), and the diaphragm mounting seat (42) is installed with a peristaltic tube (8) wrapped around the peristaltic device at the liquid inlet, and the peristaltic tube (8) is also connected to the liquid storage container through the third catheter (6).

6. The medical perfusion pump pressure and flow monitoring device according to claim 5, characterized in that: The positioning seat (51) has a snap-in socket for the peristaltic tube (8) or the third conduit (6) to be snap-fitted.

7. The medical infusion pump pressure and flow monitoring device according to claim 5, wherein: The first conduit (7) and the peristaltic tube (8) are respectively plugged into the diaphragm mounting seat (42) via a pipe joint, and the peristaltic tube (8) and the third conduit (6) are plugged into each other via a pipe joint.

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