A pain pump for acute trauma patients

Abstract

The application relates to the field of medical supplies, in particular to a pain pump for acute trauma patients, which comprises a shell and a pump core, the pump core is arranged in the shell, the pump core comprises upper and lower piston cylinders which are the same in shape and size, the upper and lower piston cylinders are coaxially arranged in cylindrical structures, the upper and lower piston cylinders are fixedly arranged on the upper and lower sides of a middle bottom plate respectively, a piston is slidably arranged in each of the upper and lower piston cylinders, the upper and lower pistons are fixedly connected through a connecting rod, a driving motor is fixedly arranged on the middle bottom plate, and the driving motor drives the pistons in the upper and lower piston cylinders to reciprocate through the connecting rod. The pain pump can realize linear continuous output and avoid direct contact between the medicine liquid and the moving parts.

Description

Technical Field

[0001] This invention relates to the field of medical supplies, specifically to a pain relief pump for patients with acute trauma. Background Technology

[0002] Patients with acute trauma often experience severe pain, and timely and effective analgesia is crucial for relieving their suffering and preventing pain-related complications. Patient-controlled analgesia (PCA) pumps are currently commonly used analgesia delivery devices in clinical practice, allowing patients to administer medication themselves within a preset safety range, thus improving the timeliness and individualization of analgesia.

[0003] Existing analgesic pumps are mainly classified into two types according to their driving method: elastic pumps and electronic pumps. Elastic pumps rely on the elastic contraction force of the reservoir to drive the drug solution, and the flow rate is controlled by the flow limiting tube. Its output is a continuous flow, but the flow rate is fixed and cannot be adjusted. Moreover, as the reservoir empties, the output flow rate decreases, making it difficult to meet the analgesic needs of trauma patients at different stages of treatment.

[0004] Electronic analgesic pumps often use peristaltic pumps as their drive mechanism. Peristaltic pumps deliver medication by alternately squeezing and releasing the infusion tubing using rollers. Their operation inherently involves intermittent periods: there is a release period between the completion of one roller's squeezing action and the contact of the next roller with the tubing. During this time, the squeezed tubing rebounds to draw in the medication, causing a pause in the forward delivery of the medication. Therefore, the output of a peristaltic pump is a discontinuous, pulsatile flow, rather than a continuous, non-linear flow. This intermittent, pulsatile delivery characteristic can lead to microscopic fluctuations in blood drug concentration, potentially affecting the stability of analgesia quality for acute trauma patients requiring stable analgesia. Furthermore, in the drive mechanism of existing electronic analgesic pumps, the medication directly contacts moving parts such as pistons or rollers, posing a risk of particulate contamination due to wear of these parts or lubricant exudation. Under traumatic stress, patients' immune function may be suppressed, and particulate contamination in the medication may increase the probability of adverse events.

[0005] Therefore, there is an urgent need for an analgesic pump that can achieve linear continuous output and avoid direct contact between the drug solution and moving parts. Summary of the Invention

[0006] The purpose of this invention is to provide a pain relief pump for patients with acute trauma, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: An analgesic pump for acute trauma patients includes a housing and a pump core. The pump core is disposed inside the housing and includes an upper piston cylinder and a lower piston cylinder of the same shape and size. The upper and lower piston cylinders are cylindrical structures and are placed coaxially. The upper and lower piston cylinders are respectively fixedly installed on the upper and lower sides of a middle base plate. A piston is slidably installed in each of the upper and lower piston cylinders. The upper and lower pistons are fixedly connected by a connecting rod. A drive motor is fixedly installed on the middle base plate. The drive motor drives the pistons in the upper and lower piston cylinders to reciprocate through the connecting rod. The top of the upper piston cylinder and the bottom of the lower piston cylinder are each connected to a one-way inlet valve and a one-way outlet valve. The one-way inlet valve on the upper piston cylinder is connected to the upper inlet branch pipe, and the one-way inlet valve on the lower piston cylinder is connected to the lower inlet branch pipe. The one-way outlet valve on the upper piston cylinder is connected to the upper outlet branch pipe, and the one-way outlet valve on the lower piston cylinder is connected to the lower outlet branch pipe. The upper and lower inlet branch pipes are connected to the inlet pipe, and the upper and lower outlet branch pipes are connected to the outlet pipe. The inlet pipe is connected to the analgesic drug bag, and the outlet pipe is connected to the patient's infusion line. The housing contains a power module and a control module, which are electrically connected to the drive motor.

[0008] Furthermore, a lead screw nut is rotatably mounted on the intermediate base plate, and the pistons in the upper and lower piston cylinders are connected by a lead screw. The lead screw is connected to the lead screw nut in a transmission manner, and a driven gear is fixedly mounted on the outer circumference of the lead screw nut. A driving gear is fixedly connected to the output shaft of the drive motor, and the driving gear and the driven gear are meshed together. The driving gear and the driven gear are located inside the gear cover at the bottom of the upper piston cylinder.

[0009] Furthermore, the one-way inlet valve and the one-way outlet valve are not connected to the upper piston cylinder and the lower piston cylinder, but are connected to each other through the bridge pipes on the upper and lower sides respectively; the bridge pipe is provided with elastic bubbles, and a pair of elastic bubbles can be detachably placed at the top of the upper piston cylinder and the bottom of the lower piston cylinder. During the reciprocating motion of the upper and lower pistons, the elastic bubbles are alternately compressed by the pistons. After the pressure of the pistons is released, the elastic bubbles can return to their original size and shape.

[0010] Furthermore, the elastic bubble is a bellows sealed at both ends, and the two ends of the bellows are respectively connected to a one-way inlet valve and a one-way outlet valve.

[0011] Furthermore, the outer wall of the housing is provided with elastic clips for securing it to the patient's clothing or bed rails.

[0012] Furthermore, a medical-grade silicone sealing ring is provided between the inner wall of the upper piston cylinder and the piston.

[0013] Furthermore, the power module is a rechargeable lithium battery, and the housing is provided with a charging interface that is electrically connected to the lithium battery.

[0014] Furthermore, the housing includes a front cover and a rear cover, the pump core of which can be exposed when the rear cover is opened.

[0015] Furthermore, the control module includes a PCB board, on which a microprocessor and a motor drive circuit are integrated.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses an upper and lower piston cylinder arranged coaxially, with the two pistons connected by a lead screw to achieve synchronous reciprocating motion. The two piston cylinders alternately complete the suction and discharge actions, ensuring that the flow of drug solution in the inlet and outlet pipelines remains linear and continuous. This overcomes the shortcomings of traditional peristaltic pumps, which produce intermittent pulses, and helps maintain a stable blood drug concentration, thus improving the consistency of analgesic effects.

[0017] 2. This invention, by incorporating a bridging conduit and an elastic bubble, ensures that the piston applies pressure only to the elastic bubble without directly contacting the medication. The medication always flows within the closed cavity formed by the elastic bubble and the conduit, preventing particles or lubricant precipitates generated during piston reciprocating motion from entering the medication, thus improving the safety of drug administration. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pump core structure; Figure 2 A schematic diagram of the inlet pipe, shell, and outlet pipe; Figure 3 A schematic diagram of the pump core structure after the upper piston cylinder and gear cover are opened; Figure 4 A schematic diagram of the pump core after being cut along the shafts of the upper and lower piston cylinders; Figure 5 This is a structural diagram of the lead screw, piston, drive motor, and drive components. Figure 6 This is a schematic diagram of the technical solution in Example 2 where the one-way inlet valve and the one-way outlet valve are connected by a bridge pipeline. Figure 7 This is a schematic diagram of the bellows structure; Figure 8 This is a cross-sectional view of a bellows. Figure 9 A schematic diagram of the structure of analgesia pump, analgesia solution bag, inlet tube, and outlet tube used for acute trauma patients.

[0019] In the diagram: 1. Inlet pipe; 2. Upper inlet branch pipe; 3. Lower inlet branch pipe; 4. One-way inlet valve; 5. One-way outlet valve; 6. Upper outlet branch pipe; 7. Lower outlet branch pipe; 8. Outlet pipe; 9. Intermediate base plate; 10. Lower piston cylinder; 11. Gear cover; 12. Upper piston cylinder; 13. Drive motor; 14. Drive gear; 15. Driven gear; 16. Lead screw nut; 17. Lead screw; 18. Piston; 19. Elastic bubble; 20. Bellows; 21. Housing. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 like Figures 1 to 5 as well as Figure 9 As shown, this embodiment provides an analgesic pump for acute trauma patients, including a housing 21 and a pump core disposed inside the housing 21.

[0022] The housing 21 includes a front shell and a rear cover, the pump core of which can be exposed when the rear cover is opened. The outer wall of the housing 21 is provided with elastic clips for securing it to the patient's clothing or bed rails. A power module and a control module are housed inside the housing 21, and are electrically connected to the drive motor 13. The power module is a rechargeable lithium battery, and the housing 21 has a charging interface electrically connected to the lithium battery. The control module includes a PCB board, on which a microprocessor and motor drive circuitry are integrated.

[0023] The pump core includes an upper piston cylinder 12 and a lower piston cylinder 10 of the same shape and size. The upper piston cylinder 12 and the lower piston cylinder 10 are cylindrical structures and are coaxially positioned. The upper piston cylinder 12 and the lower piston cylinder 10 are respectively fixedly mounted on the upper and lower sides of the intermediate base plate 9. A piston 18 is slidably installed inside each of the upper piston cylinder 12 and the lower piston cylinder 10, and the upper and lower pistons 18 are fixedly connected by a connecting rod. Medical-grade silicone sealing rings are provided between the inner walls of the upper piston cylinder 12 and the lower piston cylinder 10 and the pistons 18.

[0024] A drive motor 13 is fixedly mounted on the intermediate base plate 9. A lead screw nut 16 is rotatably mounted on the intermediate base plate 9. The pistons 18 in the upper piston cylinder 12 and the lower piston cylinder 10 are connected by a lead screw 17, which is drively connected to the lead screw nut 16. A driven gear 15 is fixedly mounted on the outer circumference of the lead screw nut 16. A drive gear 14 is fixedly connected to the output shaft of the drive motor 13, and the drive gear 14 and the driven gear 15 are meshed together. The drive gear 14 and the driven gear 15 are located inside the gear cover 11 at the bottom of the upper piston cylinder 12. The drive motor 13 drives the lead screw nut 16 to rotate through the drive gear 14 and the driven gear 15. The lead screw nut 16 drives the lead screw 17 to perform linear reciprocating motion, thereby driving the two pistons 18 to perform synchronous reciprocating motion in the upper piston cylinder 12 and the lower piston cylinder 10.

[0025] Both the top of the upper piston cylinder 12 and the bottom of the lower piston cylinder 10 are connected to a one-way inlet valve 4 and a one-way outlet valve 5, respectively. The one-way inlet valve 4 on the upper piston cylinder 12 is connected to the upper inlet branch pipe 2, and the one-way inlet valve 4 on the lower piston cylinder 10 is connected to the lower inlet branch pipe 3. The one-way outlet valve 5 on the upper piston cylinder 12 is connected to the upper outlet branch pipe 6, and the one-way outlet valve 5 on the lower piston cylinder 10 is connected to the lower outlet branch pipe 7. The upper inlet branch pipe 2 and the lower inlet branch pipe 3 are both connected to the inlet pipe 1, and the upper outlet branch pipe 6 and the lower outlet branch pipe 7 are both connected to the outlet pipe 8. The inlet pipe 1 is connected to the analgesic drug bag, and the outlet pipe 8 is connected to the patient's infusion line.

[0026] Working principle:

[0027] After the drive motor 13 starts, it drives the lead screw nut 16 to rotate through the drive gear 14 and the driven gear 15. The lead screw 17 converts the rotational motion into linear reciprocating motion, driving the upper and lower pistons 18 to move synchronously in the upper piston cylinder 12 and the lower piston cylinder 10.

[0028] When piston 18 moves away from one-way inlet valve 4 and one-way outlet valve 5, the internal space of piston cylinder increases, creating negative pressure. At this time, one-way inlet valve 4 opens and one-way outlet valve 5 closes, and the medicine is drawn from inlet pipe 1 through upper inlet branch pipe 2 (or lower inlet branch pipe 3) and one-way inlet valve 4 into upper piston cylinder 12 (or lower piston cylinder 10).

[0029] When piston 18 moves toward the one-way inlet valve 4 and one-way outlet valve 5, the internal space of the piston cylinder decreases, creating positive pressure. At this time, one-way inlet valve 4 closes and one-way outlet valve 5 opens, and the medicine flows from one-way outlet valve 5 through the upper outlet branch pipe 6 (or lower outlet branch pipe 7) into the outlet pipe 8, and is finally delivered to the patient.

[0030] Since the upper and lower pistons 18 are fixedly connected by the lead screw 17, they move synchronously. When one piston is in the suction stroke, the other piston is in the discharge stroke, so that the flow of medicine in the inlet pipe 1 and the outlet pipe 8 remains continuous.

[0031] This embodiment utilizes a coaxially arranged upper and lower piston cylinder, driven by a lead screw to synchronously reciprocate, achieving alternating suction and discharge of liquid. This ensures continuous flow of medication in the inlet and outlet lines, reducing output pulsation. The gear-driven system is compact and provides smooth transmission. The openable rear cover facilitates pump core inspection and maintenance. Elastic clips secure the analgesic pump to the patient's clothing or bed rail, preventing it from falling off during use. Medical-grade silicone sealing rings ensure a tight seal between the piston and piston cylinder, preventing medication leakage. A rechargeable lithium battery powers the device, and the charging interface allows for repeated use. An integrated microprocessor and motor drive circuit on the PCB board enable precise control of the drive motor.

[0032] Example 2 This embodiment improves upon Embodiment 1 by modifying the connection method between the one-way inlet valve 4 and the one-way outlet valve 5. The parts identical to those in Embodiment 1 will not be repeated here; only the differences will be described.

[0033] like Figure 6 As shown, the one-way inlet valve 4 and one-way outlet valve 5 are not directly connected to the upper piston cylinder 12 and the lower piston cylinder 10, but are connected through bridge pipes on the upper and lower sides respectively. Elastic bubbles 19 are provided on the bridge pipes. A pair of elastic bubbles 19 are detachably placed at the top of the upper piston cylinder 12 and the bottom of the lower piston cylinder 10. During the reciprocating motion of the upper and lower pistons 18, the elastic bubbles 19 are alternately compressed by the pistons 18. After the pressure of the pistons 18 is released, the elastic bubbles 19 can return to their original size and shape.

[0034] like Figure 7 and Figure 8 As shown, the elastic bubble 19 is a bellows 20 sealed at both ends, and the two ends of the bellows 20 are respectively connected to a one-way inlet valve 4 and a one-way outlet valve 5.

[0035] Working principle:

[0036] After the drive motor 13 starts, it drives the lead screw nut 16 to rotate through the drive gear 14 and the driven gear 15. The lead screw 17 drives the upper and lower pistons 18 to reciprocate synchronously.

[0037] Unlike Example 1, the piston 18 does not directly contact the liquid medicine. When the piston 18 moves upward, the elastic bubble 19 located at the top of the upper piston cylinder 12 is compressed, increasing the internal pressure of the elastic bubble 19. This causes the one-way outlet valve 5 connected to it to open, while the one-way inlet valve 4 closes, allowing the liquid medicine inside the elastic bubble 19 to be discharged through the upper outlet manifold 6. Simultaneously, the elastic bubble 19 located at the bottom of the lower piston cylinder 10 experiences pressure relief after the piston 18 leaves. The elastic bubble 19 recovers its original size and shape due to its own elasticity, creating a negative pressure inside. This causes the one-way inlet valve 4 connected to it to open, while the one-way outlet valve 5 closes, allowing the liquid medicine to be drawn into the elastic bubble 19 through the lower inlet manifold 3.

[0038] When piston 18 moves downward, the elastic bubble 19 at the bottom of lower piston cylinder 10 is compressed, and the liquid medicine inside is discharged through lower outlet pipe 7; the pressure on the elastic bubble 19 at the top of upper piston cylinder 12 is released, it returns to its original state and draws in the liquid medicine.

[0039] In this cycle, the two elastic bubbles 19 alternately perform the actions of absorbing and discharging liquid, so that the flow of medicine in the inlet pipe 1 and the outlet pipe 8 remains continuous.

[0040] This embodiment achieves non-contact isolation between the piston and the medication by incorporating a bridging conduit and an elastic bubble. The piston applies pressure only to the elastic bubble, ensuring the medication always flows within the closed cavity formed by the bubble and the conduit. This avoids potential particulate contamination from direct piston-medication contact during reciprocating motion, thus improving medication safety. The elastic bubble employs a corrugated structure, providing excellent elastic recovery and ensuring reliable suction and discharge. The elastic bubble is detachable for easy replacement and maintenance. This embodiment further enhances the cleanliness and safety of the medication while maintaining continuous output.

Claims

1. A pain relief pump for acute trauma patients, characterized in that, Includes a housing (21) and a pump core: the pump core is located inside the housing (21). The pump core includes an upper piston cylinder (12) and a lower piston cylinder (10) of the same shape and size. The upper piston cylinder (12) and the lower piston cylinder (10) are cylindrical structures and are placed coaxially. The upper piston cylinder (12) and the lower piston cylinder (10) are respectively fixedly installed on the upper and lower sides of the middle base plate (9). A piston (18) is slidably installed in each of the upper piston cylinder (12) and the lower piston cylinder (10). The upper and lower pistons (18) are fixedly connected by a connecting rod. A drive motor (13) is fixedly installed on the middle base plate (9). The drive motor (13) drives the pistons (18) in the upper piston cylinder (12) and the lower piston cylinder (10) to reciprocate through the connecting rod. The top of the upper piston cylinder (12) and the bottom of the lower piston cylinder (10) are each connected to a one-way inlet valve (4) and a one-way outlet valve (5). The one-way inlet valve (4) on the upper piston cylinder (12) is connected to the upper inlet branch pipe (2), the one-way inlet valve (4) on the lower piston cylinder (10) is connected to the lower inlet branch pipe (3), the one-way outlet valve (5) on the upper piston cylinder (12) is connected to the upper outlet branch pipe (6), the one-way outlet valve (5) on the lower piston cylinder (10) is connected to the lower outlet branch pipe (7), the upper inlet branch pipe (2) and the lower inlet branch pipe (3) are connected to the inlet pipe (1), the upper outlet branch pipe (6) and the lower outlet branch pipe (7) are connected to the outlet pipe (8), the inlet pipe (1) is connected to the analgesic drug bag, and the outlet pipe (8) is connected to the patient's infusion line. The housing (21) contains a power module and a control module, which are electrically connected to the drive motor (13).

2. The analgesic pump for acute trauma patients according to claim 1, characterized in that: A lead screw nut (16) is rotatably mounted on the intermediate base plate (9). The pistons (18) in the upper piston cylinder (12) and the lower piston cylinder (10) are connected by a lead screw (17). The lead screw (17) is connected to the lead screw nut (16) in a transmission connection. A driven gear (15) is fixedly mounted on the outer circumference of the lead screw nut (16). A driving gear (14) is fixedly connected to the output shaft of the drive motor (13). The driving gear (14) and the driven gear (15) are meshed and installed. The driving gear (14) and the driven gear (15) are located inside the gear cover (11) at the bottom of the upper piston cylinder (12).

3. A pain relief pump for acute trauma patients according to claim 1, characterized in that: The one-way inlet valve (4) and one-way outlet valve (5) are not connected to the upper piston cylinder (12) and the lower piston cylinder (10), but are connected through the bridge pipes on the upper and lower sides respectively; the bridge pipe is provided with elastic bubbles (19), and a pair of elastic bubbles (19) can be detachably placed on the top of the upper piston cylinder (12) and the bottom of the lower piston cylinder (10). During the reciprocating motion of the upper and lower pistons (18), the elastic bubbles (19) are alternately compressed by the pistons (18). After the pressure of the pistons (18) is released, the elastic bubbles (19) can return to their original size and shape.

4. A pain relief pump for acute trauma patients according to claim 3, characterized in that: The elastic bubble (19) is a bellows (20) sealed at both ends, and the two ends of the bellows (20) are respectively connected to a one-way inlet valve (4) and a one-way outlet valve (5).

5. A pain relief pump for acute trauma patients according to claim 1, characterized in that: The outer wall of the housing (21) is provided with elastic clips for fixing to the patient's clothing or bed rails.

6. A pain relief pump for acute trauma patients according to claim 1, characterized in that: Medical-grade silicone sealing rings are provided between the inner walls of the upper piston cylinder (12) and the lower piston cylinder (10) and the piston (18).

7. A pain relief pump for acute trauma patients according to claim 1, characterized in that: The power module is a rechargeable lithium battery, and the housing (21) is provided with a charging interface that is electrically connected to the lithium battery.

8. A pain relief pump for acute trauma patients according to claim 1, characterized in that: The housing (21) includes a front housing and a rear cover, the pump core of which can be exposed when the rear cover is opened.

9. A pain relief pump for acute trauma patients according to claim 1, characterized in that: The control module includes a PCB board, on which a microprocessor and a motor drive circuit are integrated.

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