CN111388795A

CN111388795A - Mobile medical device suitable for cerebral apoplexy patient

Info

Publication number: CN111388795A
Application number: CN202010214134.9A
Authority: CN
Inventors: 郭桂丽; 余宏超; 高兰; 杨飘; 刘利群
Original assignee: Xuanwu Hospital
Current assignee: Xuanwu Hospital
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-07-10

Abstract

The invention relates to an ambulatory medical device suitable for use with a stroke patient, the ambulatory medical device comprising: a syringe pump housing having a housing open end and a cartridge for storing a medicament; a pump drive device configured in the syringe pump housing for dispensing the medicament in the cartridge; a closure assembly fitted to the syringe pump housing by engagement with the housing open end for delivering the medicament dispensed from the cartridge to the exterior of the syringe pump housing, wherein an axial micro-gap is formed between the closure assembly end outer wall fitted to the syringe pump housing and the syringe pump housing inner wall, the closure assembly having a first sealing element at the location of engagement between the syringe pump housing and the closure assembly with which they are engaged and communicating with the axial micro-gap.

Description

Mobile medical device suitable for cerebral apoplexy patient

Technical Field

The invention relates to the technical field of infusion instruments for introducing media into a body in an injection mode, in particular to a mobile medical device suitable for a cerebral apoplexy patient.

Background

Stroke (also called Stroke or cerebrovascular accident) refers to a group of diseases in which brain tissues are damaged due to blood circulation disorder caused by sudden rupture or blockage of Cerebral vessels, and includes ischemic Stroke (ischemistroke) and Hemorrhagic Stroke (Hemorrhagic Stroke). Stroke, as a common nervous system disease, has become a serious disease seriously threatening the life health and life quality of residents due to high morbidity, mortality, recurrence rate and disability rate. Diabetes is an independent risk factor of ischemic stroke, long-term hyperglycemia increases stroke risk, the stroke incidence of a diabetic patient is four times that of a normal person, hyperglycemia damages cerebral vessels through various ways to cause atherosclerosis, influences elasticity and hardness of vessel walls, and causes pathological changes such as vascular intimal plaque formation, stenosis and occlusion, and heart, brain and systemic tissues are damaged due to complications such as dyslipidemia, hypertension, atherosclerosis, blood viscosity increase and the like, so that ischemic or hemorrhagic symptoms occur, namely cardiovascular and cerebrovascular complications, and one of the main manifestations is ischemic stroke.

Acute cerebral Apoplexy (ACVD) is one of the internal and external Acute diseases, the etiology is complex, the progress is rapid, 80% -90% of domestic ultra-early cerebral infarction is caused by the thrombus blocking cerebral artery, only early thrombolysis and recanalization of the occluded cerebral vessels can save the brain tissue in the ischemic penumbra, and the necrosis of ischemic brain cells is avoided. Thrombolytic therapy has a strict time limit, and a patient must be diagnosed and treated in a timely manner within a prescribed time, and even a patient who meets thrombolytic therapy conditions is not absolutely safe for thrombolysis. Many basic studies have demonstrated that the probability of active rebleeding in patients with cerebral hemorrhage is inversely proportional to the time after cerebral hemorrhage, especially within 6 hours, i.e. permanent neurological damage occurs when the cerebral tissue is ischemic for more than 6 hours, whereas thrombolytic therapy is completely ineffective once the ischemic cerebral tissue dies, possibly even resulting in thrombolytic symptomatic cerebral hemorrhage. Studies have shown that the rate of patients with thrombolytic therapy resulting in cerebral hemorrhage is about 1% to 5%, and once cerebral hemorrhage occurs with thrombolytic therapy, it is more difficult than ordinary hemorrhage hemostasis, and even leads to death. Therefore, the system is very important for timely diagnosis and treatment of stroke patients. According to the report, the third hospital in Wuhan City can quickly, timely and efficiently run out of the Chinese speed for rescuing the cerebral apoplexy for rescuing one patient, so that the patient can be timely and effectively rescued, the first time of ischemic cerebral apoplexy is confirmed after the emergency ambulance arrives, the medical personnel immediately take out the micro-injection pump in the portable thrombolysis bag, thrombolytic medicines are injected into the patient, and the medical device can be conveniently moved to win precious rescue time for the medical personnel.

The injection pump, which is a high-precision medical instrument for clinical infusion of liquid medicine, is controlled by a microprocessor, has constant pressure, perfects data display, and can accurately control the infusion speed and the infusion amount according to the required values; the venous transfusion can be maintained for twenty-four hours, the effective concentration of blood is ensured, and the side effect and complication of the transfusion are reduced; the infusion can be stopped or the infusion is finished, and the alarm can be given to prompt the nurse to carry out treatment. The injection pump system consists of a control system, an input system, an output system, a stepping motor, a state detection system, an injector, a power supply, an alarm system and other components. The main control module uses a single chip microcomputer to realize the control of the whole system, and comprises the functions of work control, parameter calculation, keyboard input state display, pressure detection, automatic labeling, automatic alarm and the like. The power supply circuit is composed of a power supply selection part, a charging part and a voltage boosting part. The power circuit provides the working power supply of the element, can automatically switch the internal power supply and the external power supply, and automatically charges the internal power supply when the external power supply is used. And after the charging is finished, the charging circuit is automatically disconnected. If the external power is cut off, the internal power supply can automatically supply power. The stepper motor connection module requires the motor control system to achieve high torque, low vibration levels, low noise, fast response, and efficient driving. The stepping motor is distributed with a controller to obtain a quasi-sine wave driving current. The clock signal controls the speed of the stepper motor. After the instruction of the circuit is obtained, the stepping motor driving circuit obtains loading voltage, the stepping motor is driven through certain pulse excitation, the stepping motor rotates under certain regular pulse frequency, then the power source is transmitted to the secondary reduction gearbox for speed reduction, the output speed is further refined and transmitted to the screw rod, the screw rod and the half-nut structure form an external circulation rolling screw pair, so that the speed is accurately transmitted to the baffle, and stable and accurate feeding motion is provided. The automatic alarm system mainly comprises functions of falling off warning, system warning, normal work indication, battery warning, external power warning and the like. A buzzer is used for sounding or a light emitting diode is used for emitting light to generate a warning signal. A pressure detection system. The sensor is a device or equipment which can sense or respond to the specified physical quantity to be measured and can convert it into usable signal according to a certain rule and output it, and can convert the input variable into electric signal which can be detected, and can transfer various parameters into computer system to make intelligent monitoring and control, and is a front-mounted component in the measuring system. Commonly used pressure sensors include resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors, capacitive acceleration sensors, optical fiber pressure sensors, and the like. Commonly used with syringe pumps are resistive pressure sensors. The working principle of the resistance sensor is to convert the measured non-electricity into a resistance value, the purpose of measuring the non-electricity is achieved by measuring the resistance value, and the bridge is adopted to form a measuring voltage, so that the resistance sensor is a measuring method with higher sensitivity. When there is no differential pressure, the two arms of the bridge are equal. The differential pressure signal is applied to the ceramic piezoresistor, and the resistance of the piezoresistor changes with the differential pressure, resulting in bridge unbalance. The bridge unbalance causes current change, and after amplification, the analog signal is converted into a digital signal and then transmitted to a CPU for processing. When the automatic liquid delivery device works, the single chip microcomputer system sends out control pulses to enable the stepping motor to rotate, the stepping motor drives the screw rod to change the rotating motion into linear motion, the piston of the injector is pushed to perform injection and infusion, and high-precision and stable liquid delivery without pulsation is achieved. The injection speed can be set by the operator by means of a keyboard operation. After the syringe pump is started, the CPU provides a motor drive voltage by means of D/A conversion. The motor rotation detection circuit is a set of photoelectric coupling circuit, a pulse signal is generated by the rotation of the motor, the pulse signal is fed back to the CPU, and the CPU controls the voltage of the motor according to the feedback so as to obtain the set rotating speed.

The injection pump has been widely used in the fields of blood transfusion, anesthetic injection, anticancer agent intake, analgesic injection, etc. due to its excellent precise quantitative characteristics, and there are many patent achievements invented at home and abroad. For example, in the prior art, as disclosed in patent document No. CN205286820U entitled to bulletin date 2016, 06, 08, the aeronautical mobile critical care rescue equipment mainly comprises a guardrail plate, a power box, support legs, and an equipment chamber, a cardiac defibrillator is installed inside one end face of the equipment chamber, an injection pump is installed on the other end face of the equipment chamber, a respirator is installed inside the middle of the equipment chamber, an infusion pump is arranged on the side of the respirator, and an adjusting button is installed on the side of the infusion pump. The beneficial effects are that: the whole device has compact structure, light weight and portability; an intensive care device is arranged inside; the light composite structure can be used for civil and military purposes, and is provided with oxygen equipment or oxygen supply externally connected with ambulances and airplanes.

Also disclosed in patent document No. CN208259980U, entitled "syringe pump" with publication date of 2018, 12, and 21, is a syringe pump comprising: the injection pump comprises an injection pump body, a transmission mechanism and a monitoring mechanism; wherein, drive mechanism includes: the sliding block can reciprocate along the sliding rail; the monitoring mechanism includes: the sensor is used for monitoring the moving position of the sliding block, is arranged on the sliding block and can move synchronously with the sliding block; the syringe pump further comprises: the control mechanism is arranged in the injection pump body and used for receiving the data of the moving position of the sliding block monitored by the sensor, calculating the current position of the sliding block and/or the residual liquid medicine in the injector and/or the residual injection time according to the data of the moving position of the sliding block and sending an alarm instruction to the alarm mechanism; and the alarm mechanism is arranged in the injection pump body and used for sending out an alarm signal according to the received alarm instruction. The syringe pump can ensure that the monitoring process of the liquid medicine injection state is stable and reliable, and the detection process is not influenced by the limiting factors such as the structure and the like of the syringe.

Also, as disclosed in patent document No. CN109893719A, published as 2019, 06, 18, a syringe pump includes a housing main body, a fixing mechanism disposed in the housing main body for fixing a syringe, a pushing mechanism slidably disposed on the housing main body for pressing the syringe, and a driving mechanism disposed in the housing main body and in transmission connection with the pushing mechanism; the injection pump also comprises a control circuit, a display panel, a keyboard input panel and a detection module; the control circuit is arranged in the shell main body and is used for controlling and coordinating the work of each mechanism of the injection pump; the display panel is arranged on the shell main body and used for displaying the working condition of the injection pump; the keyboard input panel is arranged on the shell main body and is used for setting working conditions of the injection pump, such as selecting injection time, injection speed and the like of the injection pump; the detection module is arranged on the fixing mechanism and is used for respectively detecting the flow change and the weight change of the injector; the display panel, the keyboard input panel and the detection module are respectively connected to the control circuit. The detection module comprises a plurality of infrared geminate transistors and a pressure sensor and is used for detecting the injection speed of the injection pump in real time. The device is through setting up infrared to nest of tubes and pressure sensor, but real time monitoring syringe pump injection speed reduces because the incident that the syringe pump injection speed is unusual and leads to.

The injection pump hanging rack provided by the patent document with the publication number of CN209519190U with the publication date of 2019, 10 and 22 comprises a hanging rack quick-connection bottom plate and a double-layer placing rack, wherein the double-layer placing rack is fixedly connected to the hanging rack quick-connection bottom plate through an injection pump hanging rack hanging block, a plurality of guide rail submerging parts are arranged on the other side, opposite to the double-layer placing rack, of the hanging rack quick-connection bottom plate, two relatively independent injection pump placing areas are arranged in the double-layer placing rack, an elastic fixing device is arranged in the double-layer placing rack, the hanging rack quick-connection bottom plate connected with the double-layer placing rack is installed on a guide rail in a cabin through the guide rail submerging parts, so that the injection pump is stably placed at a specific position in the cabin and is convenient to move and disassemble during rescue, the injection pump is stably placed and fixed through the injection pump hanging rack, and the hanging and disassembling in the helicopter cabin are quickly and conveniently completed, the injection pump is convenient to rescue in the air of the helicopter. The patent documents mentioned above indicate the application requirements of the injection pump in the air rescue field, and solve the problem of the placement and fixation of the injection pump in the helicopter cabin, which directly affects the use of the injection pump and the rescue efficiency during the development of the air rescue.

However, when the existing injection pump is applied to the field of aerial rescue, the change of the air pressure in the cabin in the process of sailing and flying is inevitable, the pressure change affects the human body and the infused liquid in the aviation environment, the internal pressure and the external pressure of the injection pump are inconsistent, the gas remained in the liquid storage bottle is possibly expanded, and finally the liquid medicine is accidentally overflowed from the liquid infusion tube. Meanwhile, in the case of intravenous infusion, the drug liquid may flow into the blood vessel only when the pressure of the liquid is greater than the venous pressure, and the injection pump cannot accurately control the infusion speed and the infusion amount when the drug liquid accidentally overflows from the infusion tube. In addition, the air flow jolts to cause the liquid storage bottle, the liquid medicine in the infusion tube and the air to be mixed, so that the probability that the air enters the human body circulation system along with the infusion tube is greatly increased, and the probability of air embolism is greatly increased when the medicine is taken for a patient.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

The injection pump mainly comprises a relatively closed passage formed by a medicine storage cylinder, a pump driving device, a pipeline and the like, when the injection pump is used, the interior of the medicine storage cylinder in the passage needs to be communicated with the external environment so as to realize the infusion of liquid medicine, however, if the injection pump is used in the environment with rapid and large change of the external environment air pressure, for example, in the environments of aviation flight, submarine submergence and the like, the gas remained in the medicine storage cylinder can cause the accidental overflow of the liquid medicine, and the situation is caused by the following steps: the liquid medicine is originally transferred into the medicine storage cylinder under atmospheric pressure, part of gas is inevitably left in the liquid storage cylinder, the wall of the liquid storage cylinder is not completely smooth and is attached with a large number of micro bubbles, the gas bubbles do not directly influence the infusion of the liquid medicine, but when the atmospheric pressure of the external environment of the injection pump is rapidly and greatly changed relative to the atmospheric pressure, the liquid medicine is supersaturated, the gas is gradually separated, the gas in the cylinder cannot be released by a relatively closed passage of the injection pump, the gas pressure is increased, and the infusion rate of the liquid medicine infused to the outside in the cylinder is increased by the gas with the increased pressure in the cylinder; on the other hand, this situation may result in the syringe pump failing to infuse the liquid medicine at the intended infusion rate or infusion volume, and the syringe pump failing to achieve precise control of the infusion speed and infusion volume. In addition, for example, under the environment that air flow jolts easily occur such as aviation flight, submarine submergence, etc., the liquid medicine in the liquid storage cylinder and the liquid conveying pipe is easily mixed with the air, the probability that the air enters the human body circulation system along with the liquid conveying pipe is greatly increased, and the probability of air embolism is increased when the medicine is taken to a patient.

Aiming at the defects of the prior art, the mobile medical device provided by the application, in particular to a disposable mobile medical device which can be used in an environment with the external environment air pressure changing rapidly and greatly, can be rapidly assembled and then directly connected with an infusion device to administer medicine to a patient when in use. The function of dosing under the environment that the external environment air pressure changes rapidly and greatly is realized in the way that the circumferential tiny gap arranged between the injection pump shell and the covering component in the mobile medical device is communicated with the first sealing element positioned at the joint position between the injection pump shell and the covering component which are connected with each other, and the injection pump structure which is relatively closed and can not release the gas in the cylinder in the prior art is cancelled; another aspect is that the ambulatory medical device is a non-integral structure between the second sealing member and the first sealing member, the manufacturing process is simple, and the second sealing member is subjected to an axial compressive force when the syringe pump housing is engaged with the closure assembly such that the end thereof corresponding to the inner end surface of the first portion is in a non-snug fit with the first sealing member. Different from the technical scheme that the injection of the injection pump is controlled by a central processing unit and the injection pump cannot accurately control the infusion speed and the infusion amount due to the change of the environmental pressure in the prior art, the mobile medical device provided by the invention can realize accurate administration in the environment with rapid and large change of the external environmental pressure by simple assembly, and the device has simple manufacturing process and further reduces the manufacturing cost of the disposable mobile medical device.

First, the axial small gap in the present application will be explained: axial means that the flow direction of the gap communicates with the external environment mainly in the axial direction of the syringe pump housing. The minute means that the vertical width between both side end faces for constituting the gap is sufficiently narrow and is a dimension sufficient for gas to be discharged therethrough, and for example, the maximum value that can be taken in the vertical width (range) between both side end faces may be set to [30 μm, 60 μm ], and/or the minimum value that can be taken may be set to [5 μm, 20 μm ]. As shown in fig. 2 and 3, the gap is formed primarily upon engagement between the closure assembly and the open end of the housing. The shape of the outer wall of the end part of the covering component is matched with the shape of the inner wall of the open end of the shell. After the covering component is sleeved in the inner wall of the open end of the shell and is relatively fixed with the open end of the shell, the axial tiny gap is formed between the outer circumferential surface of the covering component continuously extending along the circumferential direction of the cylindrical end part of the covering component and the inner circumferential surface of the open end of the shell continuously extending along the circumferential direction of the cylindrical end part of the shell. The axial micro gap is a space which is defined by an outer circumferential surface continuously extending along the circumferential direction of the cylindrical end part of the covering assembly on the circumferential direction taking the central axis of the injection pump shell as a rotating shaft and an inner circumferential surface continuously extending along the circumferential direction of the cylindrical end part on the open end of the shell on the axial direction of the injection pump shell, and is respectively communicated with an inner cavity of the open end of the shell and an inner cavity defined by the outer circumferential surface of the covering assembly and at least one gasket on the front and the back of the axial direction of the injection pump shell.

According to the present invention, an ambulatory medical device suitable for use with a stroke patient, the ambulatory medical device comprising: a syringe pump housing having a housing open end and a cartridge for storing a medicament; a pump drive device configured in the syringe pump housing for dispensing the medicament in the cartridge; a closure assembly fitted to the syringe pump housing by engagement with the housing open end for delivering the medicament dispensed from the cartridge to the exterior of the syringe pump housing, wherein an axial micro-gap is formed between the closure assembly end outer wall fitted to the syringe pump housing and the syringe pump housing inner wall, the closure assembly having a first sealing element at the location of engagement between the syringe pump housing and the closure assembly with which they are engaged and communicating with the axial micro-gap. Herein, the axial direction referred to in the present invention refers to the longitudinal extension direction of the cartridge or the direction in which the closure assembly is juxtaposed in engagement with the housing of the syringe pump. The radial direction mentioned below is a direction perpendicular to the above axial direction.

According to a preferred embodiment of the invention, the first sealing element has an inner end face in the radial direction for providing a venting path for the gas flow inside the syringe pump housing. The inner end face is referred to herein as the inner ring inner wall of the first sealing element, which is annular. Preferably, the first sealing element can be fixed to the housing of the syringe pump, in which case the dimensional accuracy of the first sealing element is less demanding due to the fixed position of the first sealing element. The first sealing element can also be installed on the injection pump housing in a non-fixed mode, and in this case, the requirement on the dimensional accuracy of the first sealing element is high because the first sealing element can move.

According to a preferred embodiment of the invention, the inner end face of the first sealing element surrounds an annular groove opening onto the outer wall of the end of the closure assembly. Here, the end of the covering assembly provided with the annular groove is an end engaged with the open end of the housing of the syringe pump housing. Since the inner end face is located within the annular groove, the first sealing element is located on the outer wall of the end portion of the closure assembly where the annular groove is located. Here, the end surface of the annular groove parallel to the outer wall of the covering member is regarded as a bottom surface, and the two annular end surfaces of the annular groove parallel to each other are regarded as two side end surfaces. It is further preferable that the annular groove has, as viewed in axial length, an axial length of one of the side end surfaces thereof closer to the open end of the housing that is shorter than an axial length of the other side end surface by a dimension that can be preset. And an axial length of a side end surface relatively far from the open end of the housing, which provides stable support for the first sealing element to limit deformation thereof, may be a dimension not smaller than a diameter of the outer ring of the first sealing element.

According to a preferred embodiment of the invention, the first sealing element comprises at least a microporous structural material with a high specific surface. The microporous structural materials with high specific surface mentioned here are in particular hydrophobic, gas-permeable materials. In this case, it is preferable that the first sealing member is, for example, Expanded Polytetrafluoroethylene (EPTFE) whose composition is expanded Polytetrafluoroethylene and has an extremely stable chemical property, and the membrane surface has 90 hundred million micropores per square inch, and the diameter of the micropores is 0.2 to 1.0u μm, which is far 10000 times smaller than water droplets, and even the smallest water droplets (the diameter of mist particles is about 25 μm) cannot pass through the membrane. Preferably, one end of the cartridge at the open end of the housing is an end for outputting the liquid medicine, and a separation membrane is fixed at the end of the cartridge in a sealing manner before the cover assembly is combined with the open end of the housing. Preferably, the isolation membrane may be a microporous structure material with a high specific surface, and is preferably made of Expanded Polytetrafluoroethylene (EPTFE) with air permeability and water resistance. The isolation film is used for isolating the liquid medicine from the external environment before the covering assembly is combined with the open end of the shell, and simultaneously, the air pressure inside the isolation film, namely the cylinder body, is consistent with the air pressure outside the isolation part, namely the inner cavity of the open end of the shell due to the air permeability of the isolation film. When the cover assembly is jointed with the open end of the shell, the air pressure in the isolating membrane, namely the inner part of the cylinder, and the air pressure in the isolating part, namely the inner cavity of the open end of the shell are respectively consistent with the formed axial tiny gap. In one aspect, for the gas flow path in the present application: the gas in the isolating membrane, namely the gas in the cylinder body can enter the outer part of the isolating part, namely the inner cavity of the open end of the shell through the isolating membrane, and the gas entering the inner cavity of the open end of the shell enters the inner cavity limited by the peripheral surface of the covering assembly and at least one gasket through the axial tiny gap. Since the second sealing element does not form a complete barrier to the gas flowing to the joint position through the axial small gap, the gas flowing to the joint position through the axial small gap can flow from the first sealing element to the external environment through the inner ring portion of the second sealing element, thereby providing a ventilation path for the gas flowing inside the injection pump housing. On the other hand, the flow path of the liquid medicine of the present application: upon engagement between the closure assembly and the open end of the housing, a needle tip disposed on the end of the closure assembly pierces the barrier membrane to permit the introduction of medical fluid from the interior of the barrel through the needle tip into a fluid passageway disposed in the closure assembly and to further infuse the medical fluid into a patient along an infusion set engaged with the other end of the fluid passageway in the closure assembly.

According to a preferred embodiment of the present invention, the closure assembly further comprises a second sealing element juxtaposed to the first sealing element at the engagement location, the second sealing element being resilient relative to the first sealing element, the second sealing element being configured to have a thickness at its thickest greater than that of the first sealing element, the second sealing element having a radial cross-sectional shape of substantially L, the second sealing element and the first sealing element each being similar in shape to a flange gasket and each being fitted in the annular groove, the second sealing element preferably having a radial diameter substantially the same as that of the first sealing element, the second sealing element and the first sealing element each being of a cellular material having a high specific surface area, the second sealing element preferably being of a resilient material such as nitrile rubber, a polymer, a plastic, etc. the second sealing element may be fitted in the annular groove and secured or abutted against an end face of the first sealing element, wherein the second sealing element is secured in an abutting relationship with an outer sealing element end face of the first sealing element.

According to a preferred embodiment of the present invention, the first portion inside end surface of the second seal member is radially closer to the axial center line of the second seal member than the second portion inside end surface. The first portion inboard end surface is disposed within the annular groove for a greater length than the second portion inboard end surface extends inwardly. The inner end surface of the second portion, which is relatively short in size, is disposed outside the annular groove. The thickness of the second sealing element and the thickness of the first sealing element form an axial tiny gap between the injection pump shell and the cover assembly. It is further preferred that the axial micro gap may also be included with a vent path for providing gas flow inside the syringe pump housing.

According to a preferred embodiment of the present invention, the second sealing element is subjected to an axial compressive force when the syringe pump housing is engaged with the closure assembly such that an end thereof corresponding to the inner end face of the first portion is not in close abutment with the first sealing element. The axial compressive force refers to a force having a tendency to compress applied to the second seal element and/or the first seal element at the engagement location due to the relative proximity between the end of the syringe housing and the end of the closure assembly when the closure assembly is engaged to the syringe housing. In the invention, under the action of the axial compression force, the end part of the second sealing element corresponding to the inner side end face of the first part is not tightly attached to the first sealing element. The application of a force having a tendency to compress to the two causes the two to not be in close contact, which includes the case where the two are in contact with each other but the interaction force is very weak, and also includes the case where there is no contact point with each other at all. This is achieved in the present application in that the inner ring portion of the second sealing element is in abutting relation with the first sealing element, and the outer ring portion of the sealing gasket is either in a fixed or abutting relation with the first sealing element. The second seal element does not form a complete block against the gas that flows to the joint position by the axial small gap, and the gas that flows to the joint position by the axial small gap can flow outward from the first seal element through the inner ring portion of the second seal element. In this function, a tight sealing action of the gasket between the syringe pump housing and the closure assembly is achieved, while at the same time providing a venting path for the gas flow inside said syringe pump housing.

An ambulatory medical device suitable for use with a stroke patient, the ambulatory medical device comprising: a syringe pump device for delivering the drug from the reservoir cartridge to the user through an infusion cannula and having a cradle pre-assembled on the outer wall thereof; a mounting bracket configured to be stably assembled to an armrest portion of another device and to fix the syringe pump apparatus by connecting a support portion thereof to a support frame, wherein the armrest portion of the other device may refer to an armrest portion with a flat upper end surface or an arc upper end surface applied to a wheelchair or an airline seat, the mounting bracket having at least one holding portion, and when the mounting bracket is assembled to the armrest portion of the device, an invisible end surface on the holding portion and an invisible end surface on the support portion are respectively in at least partial contact with the armrest portion of the device.

According to a preferred embodiment, the invisible end face on the holding part and the invisible end face on the bearing part have a rotationally connected relationship with a limited maximum opening angle.

According to a preferred embodiment, the at least one holding part is configured to be movable in relation to the length direction of the carrier part in order to adapt to armrest parts of other devices of different upper end faces, respectively.

Drawings

FIG. 1 is a simplified block diagram of an assembly of an ambulatory medical device according to the present invention;

FIG. 2 is a simplified cross-sectional structural schematic view of a first sealing member and a second sealing member provided in accordance with the present invention;

FIG. 3 is a simplified cross-sectional structural schematic view of the open end of the housing of the ambulatory medical device provided in accordance with the present invention; and

FIG. 4 is a simplified structural schematic diagram of the present invention for mounting an ambulatory medical device to an armrest portion.

List of reference numerals

1: the injection pump housing 2: case open end 3: cartridge case

4: pump drive device 5: the covering component 6: axial micro gap

7: first seal member 8: inner end surface 9: annular groove

10: second seal member 11: first-portion inboard end face 12: second part inboard end face

13: the controller device 14: syringe pump device 15: supporting frame

16: mounting frame 17: armrest portion 18: upper end face

19: holding section 20: bearing part

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a simplified schematic diagram of an ambulatory medical device according to the present invention before assembly. The ambulatory medical device mainly comprises a controller device 13 and a syringe pump device 14. The controller device 13 and the injection pump device 14 are matched in shape, and the controller device and the injection pump device 14 can be installed or detached to replace a new injection pump device 14 in a detachable connection mode. The syringe pump device 14 is assembled from two main parts, namely a syringe pump housing 1 and a cover assembly 5.

The following describes a specific procedure for applying the ambulatory medical device proposed in the present application to an aviation environment to provide pressure equalization in the case where the pressure inside the syringe pump device 14 is different from the pressure inside the cabin:

first, as shown in fig. 1, before a patient performs administration, the ambulatory medical device includes a controller device 13, a syringe pump housing 1, and a closure assembly 5, which are separately provided. The syringe pump device 14 is then formed by first assembling the closure assembly 5 to the syringe pump housing 1. The two ends of the covering component 5 are respectively communicated with the liquid medicine in the medicine storage cylinder 3 and the transfusion device/transfusion tube. The syringe pump device 14 is fitted to the controller device 13. The controller device 13 is provided with an operation interface/display device for direct operation by a user, so that the user can directly realize real-time accurate regulation and control of the operation parameters of the injection pump through the operation interface.

The cap assembly 5 is coupled to the syringe pump housing 1 along the housing open end 2 of the syringe pump housing 1, and the fluid conducting passage inside the cap assembly 5 is communicated to the inside of the cartridge 3. As shown in fig. 3, the first sealing element 7 and the second sealing element 10 disposed in the annular grooves at the ends of the closing assembly 5 are clamped by the outer walls of the ends of the closing assembly 5 and the outer wall of the open end of the syringe pump housing 1 at the left and right sides.

As shown in fig. 2, for the part of the gasket/outer ring portion of the second sealing element 10 that is outside the annular groove, it is subjected to an axial compression force when the syringe pump housing 1 is engaged with the closure assembly 5.

Since the inner ring portion of the second sealing element 10 is in abutting relationship with the first sealing element 7 in the present application, the outer ring portion of the sealing gasket may be in a fixed relationship or in an abutting relationship with the first sealing element 7. Thus, in the case where the outer ring portion is pressed tightly and the inner ring portion is not pressed, the relatively movable inner ring portion of the gasket is slightly tilted toward the lateral direction.

Under the action of the axial compressive force, the end of the second sealing element 10 corresponding to the inner end surface 11 of the first part is thus in non-tight contact with the first sealing element 7. The application of a force having a tendency to compress to the two causes the two to not be in close contact, which includes the case where the two are in contact with each other but the interaction force is very weak, and also includes the case where there is no contact point with each other at all. In this arrangement, one end of the inner ring portion is slightly tilted, the second seal element 10 cannot completely block the gas flowing to the joint position through the axial micro gap, and the gas flowing to the joint position through the axial micro gap can flow outward from the first seal element 7 through the inner ring portion of the second seal element 10. With this function, a secure sealing action of the gasket between the syringe pump housing 1 and the closure assembly 5 is achieved, and at the same time a venting path for the gas flow inside the syringe pump housing 1 is provided.

Further, the gas inside the axial micro gap is matched to the gas pressure inside the syringe pump housing 1. The gas in this region can pass through the annular grooves in succession and enter the interior of the first sealing element 7 from the inner end face 8 of the first sealing element 7. Due to the microporous structure with a high specific surface in the first sealing element 7, the gas is circulated to the outside of the syringe pump housing 1 in such a way that external liquids are prevented from entering. This achieves the effect that the ambulatory medical device, when used in an airborne environment, can provide pressure equalization in the event that the pressure inside the syringe pump assembly 14 is different from the pressure inside the cabin.

According to a preferred embodiment, as shown in fig. 4, in order to achieve a quick installation and use of the syringe pump device 14 on a wheelchair or in an aviation environment, the invention also proposes a ambulatory medical device that can be adapted to the armrest portion 17 on a wheelchair or an aviation seat. Typically, the armrest portion 17 on a wheelchair has a flat upper end surface 18, while the armrest portion 17 of an airline seat has an arcuate upper end surface 18. The mounting of the syringe pump device 14 requires a high degree of adjustability and relative stability.

According to the injection pump device, the injection pump device 14 with the support frame 15 assembled in advance and the mounting frame 16 arranged in a split mode are arranged, the mounting frame 16 is fixed on the armrest part 17 of other equipment, and therefore connecting points can be provided for the installation of the injection pump device 14 on the armrest part 17, and therefore the injection pump device can be installed and used quickly; the present invention further achieves stable support of the syringe pump device 14 on the armrest portion 17 by providing an invisible end surface on the holding portion 19 and an invisible end surface on the support portion 20 that are respectively in at least partial contact with each other at adjacent end surfaces on the armrest portion 17 of the device.

Prior to use of the ambulatory medical device, the ambulatory medical device is constructed from a syringe pump device 14 and a mounting bracket 16 that are separate from each other.

The syringe pump device 14 is used to deliver medication from the reservoir 3 to a user through an infusion cannula, the outer wall of which is pre-fitted with a cradle 15.

The support frame 15 may be of a telescopic pull rod-like construction, the free end of which may be pulled or retracted from the outer wall of the syringe pump assembly 14. The support bracket 15 is provided so that the height of the syringe pump device 14 is adjustable.

Before the ambulatory medical device is used, the mounting frame 16 has a holding portion 19 and a support portion 20 hinged to each other, and the holding portion 19 and the support portion 20 are both plate-shaped structures.

The receiver 20 is in the form of a long plate fitted to the armrest portion 17, and the holding portion 19 is of a shorter, predeterminable size relative to the receiver 20. Because the two are hinged to each other in a recoverable elastic connection, the included angle between the two is approximately 0 degrees under the condition of not applying external force, and the included angle between the two is maximally 90 degrees when the device is used.

The receiver 20 is a member for connecting the support frame 15 to abut against the side end surface of the armrest 17, and the holder 19 is a member for holding the receiver 20 stably to abut against the upper end surface 18 of the armrest 17.

The function of adapting the ambulatory medical device to the armrest part 17 on a wheelchair or an airline seat for the present application is achieved in that the holding part 19 is of a predeterminable size which is shorter than the carrier part 20. The holding portions 19 may be placed on either side of the armrest portion 17 to provide stable support for the receiver 20 relative to the armrest portion 17 of the wheelchair, or the holding portions 19 may be placed at a mid-point of the armrest portion 17 to provide stable support for the receiver 20 relative to the armrest portion 17 of the airline seat.

The mounting frame 16 is then first fitted to the armrest part 17 of the other device, in the process:

for the wheelchair armrest portion 17 with a flat upper end surface 18, a cushion for providing comfort is usually disposed on the wheelchair armrest portion 17, and a portion of the armrest that is still the flat upper end surface 18 rather than a completely arc-shaped surface is respectively retained at two ends of the cushion.

The mounting frame 16 has an annular adjusting band fixed at both ends to the invisible end surface of the holding portion 19 and the invisible end surface of the support portion 20, respectively. The adjusting belt has certain elasticity, and the length of the annular belt body can be adjusted.

Thus, the holding portion 19 and the receiver 20, which are closed and closely attached to each other, are first opened, and at least one endless adjusting belt is put on the armrest portion 17 from the open end of the armrest portion 17. At this time, the invisible end surface of the holding portion 19 abuts on the upper end surface 18 of the armrest portion 17, and at this time, the invisible end surface of the receiver 20 abuts on the outer side end surface of the armrest portion 17. The annular adjusting belt is further shortened so that the fixing action between the above-mentioned invisible end surface and the end surface of the armrest portion 17 is enhanced. Thereby completing the assembly of the mounting bracket 16.

When the ambulatory medical device is to be used, the support frame 15 in the accommodated state on the outer wall of the syringe pump device 14 is unfolded and extended. The current length of the support frame 15 is fixed while being extended to a desired length, the syringe pump device 14 is located at the upper end of the support frame 15, and it is only necessary to mount the support frame 15 to the armrest portion 17 of the other equipment to which the mounting frame 16 has been fitted, and the lower end of the support frame 15 is quickly connected to the mounting frame 16 in a detachably attached manner, whereby the ambulatory medical device is stably mounted on the armrest portion 17 of the other equipment.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. An ambulatory medical device suitable for use with a stroke patient, the ambulatory medical device comprising:

a syringe pump housing (1) having a housing open end (2) and a cartridge (3) for storing a medicament;

a pump drive (4) arranged in the syringe pump housing (1) for dispensing the medicament in the cartridge (3);

a closure assembly (5) fitted to the syringe pump housing (1) by engagement with the housing open end (2) for delivering medicament dispensed from a cartridge (3) to the exterior of the syringe pump housing (1),

wherein an axial tiny gap (6) is formed between the outer wall of the end part of the covering component (5) assembled on the injection pump shell (1) and the inner wall of the injection pump shell (1),

it is characterized in that the utility model is characterized in that,

the closure assembly (5) has a first sealing element (7), the first sealing element (7) being located at a junction between the syringe pump housing (1) and the closure assembly (5) which meet one another and communicating with the axial micro gap (6).

2. The ambulatory medical device according to claim 1, characterised in that the first sealing element (7) has an inner end face (8) in the radial direction for providing a venting path for the gas flow inside the syringe pump housing (1).

3. Ambulatory medical device according to claim 2, characterised in that the inner end face (8) of the first sealing element (7) surrounds an annular groove (9) opening onto the outer wall of the end of the closure assembly (5).

4. The ambulatory medical device according to claim 3, characterized in that the first sealing element (7) comprises at least a microporous structural material with a high specific surface.

5. The ambulatory medical device according to claim 4, characterised in that the closure assembly (5) further comprises a second sealing element (10), the second sealing element (10) being juxtaposed to the first sealing element (7) in the engaged position, the second sealing element (10) being elastically configured in comparison with the first sealing element (7).

6. The ambulatory medical device according to claim 5, characterised in that the first part-inner end face (11) of the second sealing element (10) in the radial direction is radially closer to the axis of the second sealing element (10) than the second part-inner end face (12).

7. The ambulatory medical device according to claim 6, characterised in that the second sealing element (10) is subjected to an axial compressive force when the syringe pump housing (1) is engaged with the closure assembly (5) such that its end corresponding to the first part inner end face (11) is in non-tight abutment with the first sealing element (7).

8. An ambulatory medical device suitable for use with a stroke patient, the ambulatory medical device comprising:

a syringe pump device (14) for delivering the drug from the cartridge (3) to the user through an infusion cannula and pre-fitted on its outer wall with a support frame (15);

a mounting frame (16) configured to be able to be stably fitted on an armrest portion (17) of other equipment and for fixing the injection pump device (14) in such a way that its bearing portion (20) is connected to a support frame (15),

wherein the armrest part (17) of the other equipment can refer to the armrest part (17) with a flat upper end surface or an arc-shaped upper end surface applied to the wheelchair or the aviation seat,

it is characterized in that the utility model is characterized in that,

the mounting bracket (16) has at least one holding portion (19), and when the mounting bracket (16) is assembled on the equipment armrest portion (17), the invisible end surface on the holding portion (19) and the invisible end surface on the bearing portion (20) and the equipment armrest portion (17) are respectively in at least partial contact with each other.

9. The ambulatory medical device according to claim 8, characterised in that the invisible end face on the holder (19) and the invisible end face on the bearer (20) have a rotationally coupled relationship with a limited maximum opening angle.

10. The ambulatory medical device according to claim 9, characterised in that at least one holding part (19) is configured as an armrest part (17) which can be moved in relation to the longitudinal direction of the support part (20) in order to accommodate other devices of different upper end faces, respectively.