Medical liquid delivery apparatus

Abstract

To provide a medical liquid delivery apparatus capable of performing highly accurate liquid delivery.SOLUTION: A medical liquid delivery apparatus comprises a liquid delivery unit, a temperature measuring unit which measures a liquid delivery unit temperature being the temperature of the liquid delivery unit, a temperature adjustment device which adjusts the liquid delivery unit temperature by performing air blowing in which air is drawn in from outside, passed through the liquid delivery unit, and discharged to the outside, and a heat-generating unit. The temperature adjustment device operates in any one mode selected according to a measurement value of the liquid delivery unit temperature by the temperature measuring unit from a heating mode in which the air is passed in sequence through the heat-generating unit and the liquid delivery unit, and a cooling mode in which the air is passed in sequence through the liquid delivery unit and the heat-generating unit and blown to the liquid delivery unit at a temperature lower than in the heating mode.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to medical fluid delivery devices. [Background technology]

[0002] BACKGROUND ART Medical fluid delivery devices having a fluid delivery section are known (see, for example, Patent Documents 1 to 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4837842 [Patent Document 2] Patent No. 5558463 [Patent Document 3] Patent No. 3865449 [Patent Document 4] Japanese Patent Application Publication No. 6-254159 Summary of the Invention [Problem to be solved by the invention]

[0004] In general, when the temperature of the liquid delivery section of a medical liquid delivery device changes, the amount of liquid delivered also changes.

[0005] An object of the present disclosure is to provide a medical fluid delivery device capable of delivering fluid with high accuracy. [Means for solving the problem]

[0006] One aspect of the present disclosure is as follows.

[0007] [1] A liquid delivery unit; a temperature measuring unit that measures the temperature of the liquid sending unit; a temperature adjusting device that adjusts the temperature of the liquid sending section by sucking in air from the outside, passing it through the liquid sending section, and discharging it to the outside; a heat generating portion; The temperature control device operates in one of two modes selected depending on the measured value of the temperature of the fluid delivery section by the temperature measuring section: a temperature increase mode in which the air passes through the heat generating section and then the fluid delivery section, and a temperature decrease mode in which the air passes through the fluid delivery section and then the heat generating section and is delivered to the fluid delivery section at a lower temperature than in the temperature increase mode.

[0008] [2] The temperature adjustment device is a first intake / exhaust section and a second intake / exhaust section facing the outside; an air passage extending from the first intake and exhaust unit to the second intake and exhaust unit, passing through the heat generating unit and the liquid sending unit in this order; The medical fluid delivery device described in [1] has an air delivery unit that, in the temperature increase mode, sends the air in the ventilation path from the first intake and exhaust unit side to the second intake and exhaust unit side, and in the temperature decrease mode, sends the air in the ventilation path from the second intake and exhaust unit side to the first intake and exhaust unit side to the fluid delivery unit at a temperature lower than in the temperature increase mode.

[0009] [3] The medical fluid delivery device described in [1] or [2], wherein the temperature control device operates in the temperature increase mode when the measured value of the fluid delivery section temperature is lower than the set temperature, and operates in the temperature decrease mode when the measured value of the fluid delivery section temperature is higher than the set temperature.

[0010] [4] The medical fluid delivery device according to any one of [1] to [3], wherein the temperature adjustment device does not deliver air when the measured value of the fluid delivery part temperature is a set temperature.

[0011] [5] The medical fluid delivery device according to [3] or [4], wherein the set temperature is set depending on the region in which the medical fluid delivery device is used.

[0012] [6] an alarm unit that issues an alarm; A medical fluid delivery device as described in any one of [1] to [5], wherein when the measured value of the fluid delivery section temperature rises as a result of operating in the temperature reduction mode, the air flow intensity is increased to operate in the temperature reduction mode, and when the measured value of the fluid delivery section temperature rises further as a result, the alarm unit issues an alarm.

[0013] [7] A medical fluid delivery device as described in any one of [1] to [6], wherein when the measured value of the fluid delivery section temperature rises as a result of operating in the temperature reduction mode, the air flow intensity is increased and the device operates in the temperature reduction mode, and when the measured value of the fluid delivery section temperature rises further as a result, the temperature adjustment device stops the air flow.

[0014] [8] an alarm unit that issues an alarm; A medical fluid delivery device as described in any one of [1] to [7], wherein when the measured value of the fluid delivery section temperature drops as a result of operating in the temperature rise mode, the air flow intensity is reduced and the device operates in the temperature rise mode, and when the measured value of the fluid delivery section temperature drops further as a result, the alarm unit issues an alarm.

[0015] [9] A medical fluid delivery device according to any one of [1] to [8], wherein when the measured value of the fluid delivery section temperature drops as a result of operating in the temperature rise mode, the strength of the air flow is reduced and the device operates in the temperature rise mode, and when the measured value of the fluid delivery section temperature drops further as a result, the temperature adjustment device stops the air flow.

[0016]

[10] The medical fluid delivery device according to any one of [1] to [9], wherein the fluid delivery section has a tube placement section in which a fluid delivery tube is placed, and a tube pressing section that presses the fluid delivery tube placed in the tube placement section to deliver the liquid in the fluid delivery tube. [Effects of the Invention]

[0017] According to the present disclosure, it is possible to provide a medical fluid delivery device capable of delivering fluid with high accuracy. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 10 is a cross-sectional view showing the air flow in a temperature increasing mode of a medical fluid delivery device according to an embodiment of the present disclosure. [Figure 2] 3 is a cross-sectional view showing the air flow in the temperature decreasing mode of the medical fluid delivery device shown in FIG. 1. FIG. [Figure 3] 2 is a flow chart showing the operation of the medical fluid delivery device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0020] As shown in Figures 1 to 3, a medical fluid delivery device 1 according to one embodiment of the present disclosure comprises a fluid delivery section 2, a temperature measuring section 3 for measuring the fluid delivery section temperature, which is the temperature of the fluid delivery section 2, a temperature adjusting device 5 for adjusting the fluid delivery section temperature by drawing in air from the outside 4 of the medical fluid delivery device 1, passing it through the fluid delivery section 2, and discharging it to the outside 4, and a heat generating section 6. The temperature adjusting device 5 operates in one of two modes selected (see step S2 in Figure 3) depending on the measurement value of the fluid delivery section temperature by the temperature measuring section 3: a temperature increasing mode (see step S3 in Figure 3) in which air is passed through the heat generating section 6 and then the fluid delivery section 2, as shown by the hollow arrow in Figure 1, and a temperature decreasing mode (see step S10 in Figure 3) in which air is passed through the fluid delivery section 2 and then the heat generating section 6, as shown by the hollow arrow in Figure 2, and then blown to the fluid delivery section 2 at a lower temperature than in the temperature increasing mode.

[0021] Although the operating environment temperature of the medical fluid delivery device 1 is, for example, 5 to 40°C, the driving force for fluid delivery in the fluid delivery unit 2 (such as the pressing force when using the tube pressing unit 2b described later) is set on the assumption that the temperature is room temperature (for example, 20 to 25°C). Therefore, if the actual temperature during fluid delivery deviates from room temperature, an error in the amount of fluid delivered will occur. To reduce this error, it is preferable to adjust the temperature of the fluid delivery unit to approach room temperature. With the above configuration, the temperature adjustment device 5 can adjust the temperature of the fluid delivery unit to approach room temperature by selecting an appropriate mode from the temperature increase mode and the temperature decrease mode according to the measured value of the temperature of the fluid delivery unit. That is, the temperature of the fluid delivery unit 2 that is lower than room temperature can be increased in the temperature increase mode (see steps S4 to S5 in FIG. 3), and the temperature of the fluid delivery unit 2 that is higher than room temperature can be decreased in the temperature decrease mode (see steps S11 to S12 in FIG. 3). In addition, in the temperature increase mode, the temperature of the fluid delivery unit 2 can be increased by utilizing the heat generated by the heat generating unit 6. If the heat generating unit 6 is a heat generating component such as an electronic component on a circuit board or an electric motor, the heat generating unit 6 can be used as a heat source for heating the fluid delivery unit 2 while simultaneously cooling the heat generating unit 6 in the temperature increasing mode. Furthermore, the temperature of the fluid delivery unit 2 can be decreased while simultaneously cooling the heat generating unit 6 in the temperature decreasing mode. Therefore, the medical fluid delivery device 1 can deliver fluid with high accuracy. Furthermore, the above configuration can prevent a liquid lower than room temperature from being delivered to a patient through the fluid delivery tube 7, thereby reducing the burden on the patient. The temperature increasing mode typically occurs when the medical fluid delivery device 1 stored in an environment lower than room temperature is used in a room temperature environment. The temperature decreasing mode typically occurs when the medical fluid delivery device 1 stored in an environment higher than room temperature is used in a room temperature environment. The temperature measuring unit 3 can be configured using a thermocouple, a resistance temperature detector, a thermistor, or the like, but is not limited thereto.

[0022] The temperature control device 5 includes a first intake / exhaust section 5a and a second intake / exhaust section 5b facing the outside 4, an air passage 5c extending from the first intake / exhaust section 5a to the second intake / exhaust section 5b, passing through the heat generating section 6 and the liquid supply section 2 in that order, and an air blower 5d that, in a temperature increase mode (as shown in FIG. 1), sends air in the air passage 5c from the first intake / exhaust section 5a to the second intake / exhaust section 5b, and in a temperature decrease mode (as shown in FIG. 2), sends air in the air passage 5c from the second intake / exhaust section 5b to the first intake / exhaust section 5a to the liquid supply section 2 at a lower temperature than in the temperature increase mode. This configuration allows switching between the temperature increase mode and the temperature decrease mode simply by reversing the direction of airflow by the air blower 5d (e.g., by simply reversing the rotation direction when the air blower 5d is configured as a fan such as an electric fan). The air blower 5d can be controlled by a control device (not shown) configured in the temperature control device 5, such as a computer. In this embodiment, the air blower 5d is provided between the first intake / exhaust section 5a and the heat generating section 6 in the ventilation path 5c, but is not limited to this.

[0023] The temperature adjustment device 5 operates in a temperature increase mode when the measured value of the liquid delivery section temperature is lower than the set temperature (see steps S1 to S3 in FIG. 3), and operates in a temperature decrease mode when the measured value of the liquid delivery section temperature is higher than the set temperature (see steps S1 to S2, S10 in FIG. 3). According to the above configuration, by appropriately setting the set temperature, the temperature adjustment device 5 can be operated in an appropriate mode to bring the liquid delivery section temperature closer to room temperature. The set temperature is preferably room temperature, and may be within a predetermined temperature range having an upper limit and a lower limit, or may be a predetermined temperature value.

[0024] The temperature adjustment device 5 does not send air when the measured value of the liquid sending part temperature is the set temperature (see steps S5, 12, and 16 in FIG. 3). According to the above configuration, unnecessary energy consumption by the temperature adjustment device 5 can be suppressed.

[0025] The set temperature is set according to the region (e.g., country) in which the medical fluid delivery device 1 is used. According to the above configuration, the temperature of the fluid delivery unit can be made close to the normal temperature of the region of use by the temperature adjustment device 5, thereby realizing highly accurate fluid delivery by the medical fluid delivery device 1 in which the driving force of the fluid delivery unit 2 is set taking into account the normal temperature of the region of use. The medical fluid delivery device 1 may be configured to automatically obtain its own location information by communication, for example, based on GPS (Global Positioning System), and identify the region of use using the location information.

[0026] The medical fluid delivery device 1 includes an alarm unit 8 that issues an alarm. When the measured temperature of the fluid delivery unit increases as a result of operating in the temperature reduction mode, the device operates in the temperature reduction mode by increasing the airflow intensity (see steps S11 and S13 in FIG. 3 ). If the measured temperature of the fluid delivery unit further increases as a result, the alarm unit 8 issues an alarm (see steps S14 and S15 in FIG. 3 ). According to the above configuration, if the temperature of the fluid delivery unit increases even when air is blown in the temperature reduction mode (for example, when the air temperature of the outside 4 is higher than the set temperature), the device can try increasing the airflow intensity and see if the temperature of the fluid delivery unit decreases. If the temperature does not increase but increases (for example, when the air temperature of the outside 4 is significantly higher than the set temperature), an alarm is issued, thereby notifying the user of an abnormality in the temperature of the fluid delivery unit. This alarm typically occurs when the medical fluid delivery device 1, which has been stored in an environment higher than room temperature, is used in an environment significantly higher than room temperature. The alarm can be generated by sound, display, or both.

[0027] As shown in steps S14 and S15 of Figure 3, when the measured temperature of the fluid delivery section increases as a result of operating in the temperature reduction mode, the medical fluid delivery device 1 may be configured to increase the airflow intensity and operate in the temperature reduction mode (see steps S11 and S13 of Figure 3), and when the measured temperature of the fluid delivery section increases further as a result, the temperature adjustment device 5 may be configured to stop the airflow.

[0028] The medical fluid delivery device 1 includes an alarm unit 8 that issues an alarm. When the measured value of the fluid delivery unit temperature drops as a result of operating in the temperature increase mode, the device operates in the temperature increase mode with the airflow intensity reduced (see steps S4 and S7 in FIG. 3 ). If the measured value of the fluid delivery unit temperature drops further as a result, the alarm unit 8 issues an alarm (see steps S8 and S9 in FIG. 3 ). According to the above configuration, when the fluid delivery unit temperature drops even when air is blown in the temperature increase mode (for example, when the air temperature of the outside 4 is lower than the set temperature), it is possible to predict that the air is being blown without being sufficiently heated by the heat generating unit 6. Therefore, by reducing the airflow intensity, the heating time by the heat generating unit 6 can be extended, and the fluid delivery unit temperature can be expected to increase. If the temperature still drops (for example, when the air temperature of the outside 4 is significantly lower than the set temperature), an alarm is issued, thereby notifying the user of an abnormality in the fluid delivery unit temperature. This alarm typically occurs when the medical fluid delivery device 1, which has been stored in an environment lower than room temperature, is used in an environment significantly lower than room temperature. Therefore, the heating capacity of the heat generating unit 6 may be set low, and such control may be performed when the heating capacity is relatively insufficient. On the other hand, the heating capacity of the heat generating unit 6 may be set high. In this case, the air is sufficiently heated by the heat generating unit 6, so the airflow rate and the amount of heating are proportional. Therefore, if the measured temperature of the fluid delivery unit drops as a result of operating in the heating mode, the airflow intensity may be increased and the device may be set to operate in the heating mode.

[0029] When the measured value of the temperature of the liquid delivery unit drops as a result of operating in the temperature increase mode, the medical liquid delivery device 1 operates in the temperature increase mode by reducing the strength of the airflow (see steps S4 and S7 in FIG. 3), and when the measured value of the temperature of the liquid delivery unit drops further as a result, the temperature adjustment device 5 stops the airflow (see steps S8 and S9 in FIG. 3). According to the above configuration, when the temperature of the liquid delivery unit drops even when air is sent in the temperature increase mode, the strength of the airflow is reduced, which is expected to increase the temperature of the liquid delivery unit. When the temperature still drops, the airflow is stopped, which prevents the temperature of the liquid delivery unit from dropping further.

[0030] The temperature adjustment device 5 compares the measured temperature of the liquid delivery section with the set temperature, and based on the comparison result, performs a temperature adjustment operation (see steps S2 to S5, 7 to S16 in Figure 3) in which an operation is selected from operation in a temperature increase mode, operation in a temperature decrease mode, or operation in a temperature maintenance mode in which no air is delivered, and performs the temperature adjustment operation while the liquid delivery continues (see step S6 in Figure 3).

[0031] The medical fluid delivery device 1 may have an outside air temperature measuring unit 9 that measures the temperature of the air outside 4, and may be configured to set the strength of the air blown by the air blower 5d based on the measurement result by the outside air temperature measuring unit 9. The setting of the strength of the air blown may be configured to be performed by the above-mentioned control device.

[0032] As shown in FIG. 1, the liquid delivery unit 2 includes a tube placement unit 2a in which a liquid delivery tube 7 is placed, and a tube pressing unit 2b that presses the liquid delivery tube 7 placed in the tube placement unit 2a to deliver the liquid in the liquid delivery tube 7. The tube pressing unit 2b presses the wall surface of the elastically deformable liquid delivery tube 7 to cause peristaltic movement and deliver the liquid. The tube pressing unit 2b may be configured to sequentially press the liquid delivery tube 7 to cause peristaltic movement by sequentially moving multiple pressing members arranged in the longitudinal direction of the liquid delivery tube 7 back and forth in the short direction of the liquid delivery tube 7, or may be configured to cause peristaltic movement by operating the pressing members to squeeze the liquid delivery tube 7 in the longitudinal direction. The pressing force of the tube pressing unit 2b required to achieve a predetermined flow rate in the liquid delivery unit 2 depends on the temperature of the liquid delivery unit 2 (liquid delivery tube 7).

[0033] The medical fluid delivery device 1 is configured as an infusion pump. However, the medical fluid delivery device 1 is not limited to this, and may be configured as a medical pump other than an infusion pump, such as a syringe pump. The fluid delivery tube 7 may form an infusion line, or may form a fluid delivery line other than an infusion line. The liquid flowing through the fluid delivery tube 7 is, for example, a medicinal liquid.

[0034] The medical fluid delivery device 1 includes a main body 10 and an opening / closing body 11 that can open and close the tube placement section 2a. The fluid delivery tube 7 is sandwiched between the main body 10 and the opening / closing body 11 and placed in the tube placement section 2a. The main body 10 includes a temperature adjustment device 5 (first intake / exhaust section 5a, second intake / exhaust section 5b, ventilation path 5c, and blower section 5d) and a heat generating section 6. The opening / closing body 11 is attached to the main body 10 via a hinge section 12 so as to be swingable about a swing axis O, and swings to open and close the tube placement section 2a. The main body 10 includes a housing 10a and various components (not shown) housed within the housing 10a. The ventilation path 5c is formed by these components and the housing 10a. The housing 10a includes a first opening 10a1 that constitutes the first intake / exhaust section 5a and a second opening 10a2 that constitutes the second intake / exhaust section 5b. The first intake and exhaust section 5a may be configured to have a dustproof or waterproof filter that covers the first opening 10a1, and the second intake and exhaust section 5b may be configured to have a dustproof or waterproof filter that covers the second opening 10a2.

[0035] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present disclosure. [Explanation of symbols]

[0036] 1 Medical fluid delivery device 2. Liquid delivery section 2a Tube placement section 2b Tube pressing part 3 Temperature measuring part 4 External 5 Temperature adjustment device 5a First intake and exhaust section 5b Second intake and exhaust section 5c Ventilation path 5d. Blower 6 Heat generating part 7. Liquid transfer tube 8 Alarm section 9. Outside temperature measurement section 10 Main Unit 10a Housing 10a1 1st opening 10a2 2nd opening 11 Opening and closing body 12 Hinge part P Swing axis S1~16 steps

Claims

1. A liquid delivery unit; a temperature measuring unit that measures the temperature of the liquid sending unit; a temperature adjusting device that adjusts the temperature of the liquid sending section by sucking in air from the outside, passing it through the liquid sending section, and discharging it to the outside; a heat generating portion; The temperature control device operates in one of two modes selected depending on the measured value of the temperature of the fluid delivery section by the temperature measuring section: a temperature increase mode in which the air passes through the heat generating section and then the fluid delivery section, and a temperature decrease mode in which the air passes through the fluid delivery section and then the heat generating section and is delivered to the fluid delivery section at a lower temperature than in the temperature increase mode.

2. The temperature adjustment device is a first intake / exhaust section and a second intake / exhaust section facing the outside; an air passage extending from the first intake and exhaust unit to the second intake and exhaust unit, passing through the heat generating unit and the liquid feeding unit in this order; 2. The medical fluid delivery device according to claim 1, further comprising an air blower that, in the temperature increase mode, sends the air in the ventilation path from the first intake and exhaust section side to the second intake and exhaust section side, and, in the temperature decrease mode, sends the air in the ventilation path from the second intake and exhaust section side to the first intake and exhaust section side to the fluid delivery section at a temperature lower than that in the temperature increase mode.

3. The medical fluid delivery device of claim 1, wherein the temperature control device operates in the temperature increase mode when the measured value of the fluid delivery section temperature is lower than the set temperature, and in the temperature decrease mode when the measured value of the fluid delivery section temperature is higher than the set temperature.

4. The medical fluid delivery device according to claim 1 , wherein the temperature adjustment device does not send air when the measured value of the fluid delivery section temperature is a set temperature.

5. The medical fluid delivery device according to claim 3 , wherein the set temperature is set depending on the region in which the medical fluid delivery device is used.

6. an alarm unit that issues an alarm; The medical fluid delivery device of claim 1, wherein when the measured value of the fluid delivery section temperature increases as a result of operating in the temperature reduction mode, the air flow intensity is increased and the device operates in the temperature reduction mode, and when the measured value of the fluid delivery section temperature increases further as a result, the alarm unit issues an alarm.

7. The medical fluid delivery device of claim 1, wherein when the measured value of the fluid delivery section temperature increases as a result of operating in the temperature reduction mode, the air flow intensity is increased and the device operates in the temperature reduction mode, and when the measured value of the fluid delivery section temperature further increases as a result, the temperature adjustment device stops the air flow.

8. an alarm unit that issues an alarm; The medical fluid delivery device of claim 1, wherein when the measured value of the fluid delivery section temperature decreases as a result of operating in the heating mode, the air flow intensity is reduced and the device operates in the heating mode, and when the measured value of the fluid delivery section temperature decreases further as a result, the alarm unit issues an alarm.

9. The medical fluid delivery device of claim 1, wherein when the measured value of the fluid delivery section temperature decreases as a result of operating in the heating mode, the air flow intensity is reduced and the device operates in the heating mode, and when the measured value of the fluid delivery section temperature further decreases as a result, the temperature adjustment device stops the air flow.

10. 2. The medical fluid delivery device according to claim 1, wherein the fluid delivery section has a tube placement section in which a fluid delivery tube is placed, and a tube pressing section that delivers the liquid in the fluid delivery tube by pressing the fluid delivery tube placed in the tube placement section.

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