FIELD OF THE INVENTION

The present invention relates to a unique arrangement of portable and wearable syringe infusion pump. It specifically relates to an arrangement of portable and wearable syringe infusion pump for intravenous or subcutaneous, continuous or interrupted infusion of various types of medication as prescribed to patients.

BACKGROUND OF THE INVENTION

The administration of intravenous medical fluids to the patients is known in the art. Usually, solution required to be administered to the patients are present in glass or any flexible vessel/container/bottle and is administered in the venous system of the patient.

The infusion pumps used in hospitals are stand-mounted and are kept bedside to the patients. The patient needs to be in bed for the entire duration of infusion, which may extend from 1-7 days, commonly 5 days. Every time the patient uses the washroom or needs to eat or change clothes, the infusion is interrupted. So, the patient is tied to the bed for the entire duration of infusion of medication/drug. There are some situations where the patient does not need to be bedbound during the infusion, such as cancer chemotherapy and thalassemia major iron chelation.

Various infusion pumps and infusion pump systems are present in the prior art including portable infusion pumps. But available portable infusion pumps are present with having some intrinsic drawbacks related to design of the portable infusion pump. The simplest portable infusion pump includes a balloon in a bottle kind of design where the balloon is filled with the drug and deflates at its calibrated rate, thus releasing the drug at a constant rate. This is slung by straps and can be carried around by the patients, even to the washroom. The disadvantage associated with such portable infusion pump is that the infusion rate cannot be altered or set. Further, in the portable infusion pump, there is no provision for bolus infusion delivery of larger quantity of drug (at the beginning of infusion). Also, these portable infusion pumps are for single use only and cannot be reused. The other type contain the infusion pump used for thalassemia patients which mainly consist of two heads fitted on a large screw. Between these two heads are fitted in the plunger of the syringe. In this infusion pump, as the screw rotates, the heads moves together, pushing the plunger and emptying the syringe. The infusion rate can be varied to the requirement, and the battery used has a long life but requiring periodic charging. The problem associated with these infusion pump design is the size of the device. When the infusion pump is fully loaded, the heads need to be as far apart as the fully extended plunger, about 20-30 cm. Therefore this device is bulky, needs to be carried around in a satchel. Further, such infusion pump is not very comfortable to the patient. Additionally, such infusion pump usually holds 10 ml or 20 ml syringes, because of size and space constraints, requiring frequent change/refilling of syringes. Therefore, if a patient requires more than 10-20 ml infusion of a drug, the drug will have to be reloaded, a fresh syringe required, and there may be wastage of drug. Several conventional infusion pumps and systems are already known for infusion of medicines to the patient’s body. Details of few types of infusion pumps are as follows: Balloon-and-bottle type - These are made by various companies including Baxter and another companies. The balloon is made up of silicon rubber, which deflates at a fixed rate which cannot be adjusted, about 250 ml over 7 days. The pump is purchased according to the type of chemotherapy, e.g. - Infusion pump for over 5 days or 7 days. Thalassemia infusion pumps - Thalassemia infusion pumps are simple infusion pumps that are portable nature. These infusion pumps contain automatic memory of all parameters and includes automatic visible, audible and shaking alarms functions. But, these pumps have repair issues and they cannot be easily repaired locally. These infusion pumps uses their own syringes which have to be imported with the pump. Most of these pumps are designed to hold 10 ml syringes. Bedside stand-mounted pumps - These infusion pumps are most commonly used in Intensive Care Unit (ICU’s) of every hospital and chemotherapy centers. They hold 50 ml syringes.

Few of available conventional infusion pumps are as follows: US3498228 discloses a portable infusion apparatus for dispensing a measured amount of fluid which includes: a battery, controlled rectifier means coupled to the battery and a motor connected to the controlled rectifier means. A portable infusion pump has a discharge path to the patient coupled to the motor to be driven during a predetermined amount of rotation of the motor. The pump dispenses a measured amount of fluid during the predetermined amount of rotation. A unijunction oscillator means which is coupled to the controlled rectifier means for generating a series of pulses, each of these pulses triggering the controlled rectifier means into conduction to initiate the predetermined amount of rotation of the motor, and means for de-energizing the motor at the end of the predetermined amount of rotation.

US7232423 discloses an infusion pump system, an infusion pump unit for the infusion pump system and an infusion pump in general where the pump actuator is lighter, smaller, and quieter and less power consuming.

US8192394 relates to a portable infusion pump system comprising a pump unit, and a control unit that controls the dispensation of medicine from the pump unit, and a user interface coupled to the control unit of the portable infusion pump system that controls the dispensation of medicine from the pump unit. US2018/0110921 discloses a portable infusion pump that can communicate with glucose monitor, such as a continuous glucose monitor (CGM), to receive continuous feedback relating to a user's blood glucose level during insulin or other medicament therapy and can automatically deliver insulin to a user when the CGM data indicates a need for additional insulin.

WO2016/122976 relates to a programmable portable infusion device which includes electronic device such as sensors, and can be programmed to detect parameters related to the proper administration of infusion. If the sensors detect that a parameter is outside of a defined boundary or range, the infusion device may notify a user that it may not be safe to administer infusion and may prevent infusion from occurring.

The problems associated with available portable infusion pump is that they are of single use and cannot be altered or set for next usage or reused. Furthermore, problem associated with other type of portable infusion pump is that large quantity of drugs cannot be administered to the patients.

However, despite the aforesaid systems and other available conventional portable infusion pumps, a need is felt for a portable infusion pump that is more effective, convenient, competent, comfortable, efficient, durable, reusable, easily repairable, lighter, smaller and provides continuous or interrupted infusion of various types of medication/drug. A need also exists to solve the abovementioned problems in the existing art by providing the present invention.

So, it is an object of the present invention to provide a portable infusion pump which is effective, convenient, competent, comfortable, efficient, durable, reusable, easily repairable, lighter, smaller and provides continuous or interrupted infusion of various types of medication/drug. These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION

The present invention envisages an portable and wearable syringe infusion pump used for intravenous or subcutaneous, continuous or interrupted infusion of various types of medication/drug as prescribed by the doctor to the patient.

The present invention provides a portable infusion pump which is more effective, convenient, competent, comfortable, efficient, durable, reusable, portable, easily repairable, lighter, smaller and provides continuous or interrupted infusion of various types of medication.

The wearable infusion pump disclosed here is, for example, is strapped to the arm, thigh, abdomen, or carried in the pocket for the duration of infusion. The infusion rate can be set, altered, including bolus injection, and infusion breaks (drug free intervals) which can be incorporated into the code while loading the machine. The wearable infusion pump can hold 50 ml drug in a sterile space for the duration of the infusion. More importantly, the wearable infusion pump does not change in size, depending on how much drug remains to be infused. The wearable infusion pump retains its external oblong cylinder dimensions, about 15 x 5 x 3 cm, whether it is full or empty.

The present invention also provides an portable and wearable syringe infusion pump which is cylindrical in shape. The portable and wearable syringe infusion pump consists of two detachable parts including a front part called the shell and a rear part called the base. Once the medication/drug is loaded, these two parts are fitted together and locked to assemble the portable and wearable syringe infusion pump. After assembling of the portable and wearable syringe infusion pump, it is switched on to begin infusion of the medication/drug. The pump does not use conventional syringes to hold and inject the drug/medication, instead a syringe bag is used for the purpose of injection of drug/medication. According to another embodiment of the invention, the portable and wearable syringe infusion pump is used for more than one time for infusion of the medication/drug.

The portable and wearable syringe infusion pump consists of following:

Shell - The shell is a rigid, transparent, hollow, oblong cylinder, oval in cross- section. The shell has fixed external dimensions. The unique oval cylinder design of the shell is prepared for comfort to the user/patient and stable functionality. The shell has handles on either side for attachment of straps, for wearing on the arm or thigh. The shell also has a locking mechanism for securely holding the base in position once it is inserted in place. The shell is open at the rear end and has a nozzle in front through which the nozzle of the syringe bag is inserted and uncapped. Within the inner lumen are longitudinal furrows to ensure stability of the plunger head during its movement through the shell.

Base - The base consists of a plunger mechanism, a driving and controlling unit, and a power source. The base contains the driving and controlling force of the infusion pump.

Syringe Bag - The syringe bag is the only disposable part of the mechanism. It is a sterile, use-and-throw, collapsible, ribbed, thin container, with a flat base and a nozzle in front. At the front end, next to the nozzle is a rubber injection port, for filling the drug. The syringe bag is oval in cross-section, to match the shape of the shell, into which the syringe bag is inserted when filled. The syringe bag is also present in a collapsed state, in sterile blister packs, like tablets. When empty, the size of a syringe bag would be like a large coin, thus affording tremendous saving on storage space. The syringe bag only fills up when the medication/drug is injected through the injection port. Once it is fitted into the device, the nozzle is uncapped, and the syringe bag only empties once it is pressured from behind by the plunger head. The syringe bag is held in shape and made to collapse in an orderly fashion by the ribs, which are partly rigid oval rings, running circumferentially along the syringe bag.

The mechanisms used for the working of the portable and wearable syringe infusion pumps include the following:

Plunger mechanism - The plunger does not move back and forth, it unscrews and thereby unfolds through and into the shell, thus compressing the syringe bag and forcing it to empty. The plunger contains three moving parts that allow it to cover a distance of around 10 cm - a central screw surrounded by plurality of cylinder and usually contains two concentric cylinders of increasing diameter. The central screw is positioned above base level and designed to cover a vertical distance of around 2 cm. The central screw is connected to a motor with a gear mechanism which rotates at the programmed rate, depending on the requirement, including the need for bolus injection. Surrounding the screw are two concentric cylinders, the outer one being fixed to the plunger head which is oval in shape like the shell, and therefore not allowed to rotate. Once the screw begins to rotate, it pushes the cylinders-plunger head assembly up. Further, the cylinders are unable to rotate because the inner cylinder is anchored in the horizontal plane by anchoring spikes to a certain level and the outer one is fixed to the plunger head, which is fixed by the oval shape.

Beyond a certain height the inner cylinder is free of its anchoring and is therefore free to rotate. The inner cylinder then locks on to the screw and begins to rotate with the screw. The inner cylinder is now become part of the screw and pushes the outer cylinder and plunger head up. Between the two cylinders, a vertical distance of 8 cm is covered. Sequentially this process is repeated till 10 cm is covered. As each piece comes into play, the screw shaft, followed by the inner cylinder, followed by the outer cylinder, the speed of rotation is automatically adjusted for minor changes in diameter and this is programmed into the device by means of Arduino code. To rewind this mechanism, the screw rotates in the opposite direction and the whole assembly rewinds, ready to activate. There is a self-lubricating mechanism incorporated in the device

Once the infusion is over and the infusion pump needs to be opened or refilled. Programmed reverse rotation and rewinding occurs to return the cylinders to their respective resting places. Only then can the infusion pump be unlocked. This is to ensure the continued stability of the plunger mechanism.

Driving force - The driving rotational force required for the plunger mechanism would need high torque coupled with a very low speed of rotation (RPM - rounds per minute). These requirements can be met by a bipolar stepper motor with a built-in gear system with a high gear ratio, to ensure maximum driving force and minimum speed. A heat dissipation mechanism would be incorporated around the motor to avoid discomfort to the patient. Similarly, there would be measures to control the humming noise produced by the motor.

Control mechanism - The speed of rotation and therefore of infusion would be controlled by an Arduino microprocessor. The required inputs, such as rate of infusion, bolus injection, delays, etc., would be obtained and displayed by means of a LCD display and keypad-keyboard, to feed in variables. The adjustment in speed of rotation for different cylinders would be built into the Arduino program (called sketch) to run the device.

Power mechanism - The infusion pump would be powered by a rechargeable battery with a capacity of 7 days run without recharge.

A portable and wearable syringe infusion pump comprises a screw shaft, a geared motor, one or more cylinders, a set of anchoring spikes, a shell, and a disposable syringe bag. The screw shaft is mounted on a center of a base plate and the geared motor positioned below the screw shaft to drive the screw shaft. The cylinders comprise an inner cylinder and an outer cylinder concentrically positioned with each other over the screw shaft. The anchoring spikes are attached to the inner cylinder to anchor the inner cylinder, wherein the outer cylinder is fixed to an oval shaped plunger head that constrains rotation of the outer cylinder, wherein beyond a predetermined height the inner cylinder is free of the anchoring to rotate and lock the inner cylinder with the screw shaft to push the outer cylinder and plunger head upwards. The shell comprises a shell nozzle positioned concentrically above the cylinders and the disposable syringe bag is positioned within the shell, the shell is filled with medication, and the outer cylinder and plunger head pushes upwards through the syringe bag to push the medication outward via a syringe bag nozzle.

In an embodiment, the portable and wearable syringe infusion pump further comprises grooves positioned at a base of the cylinders in resting position and a locking projection for the base plate, wherein the grooves are positioned on the base plate to support the cylinders in the resting position. The inner cylinder comprises hollow columns for fixing anchoring spikes, wherein the anchoring spikes disable rotation of the cylinders by anchoring the cylinders in a horizontal plane to a predetermined level. The rotation of the outer cylinder is constrained by the plunger head, which is fixed by the oval shape of the plunger head. The screw shaft is followed by the inner cylinder and the inner cylinder is followed by the outer cylinder, wherein speed of the rotation of the cylinders is automatically adjusted for minor changes in diameter and is programmed into the portable and wearable syringe infusion pump using Arduino code.

In an embodiment, the shell comprises handles on either side of the shell for attachment of straps, for wearing on arm or thigh of a user. The shell comprises a locking mechanism for securely holding the base in position after the syringe bag is inserted in place. The shell is open at a rear end and comprises a shell nozzle in front through which the syringe bag nozzle is inserted and uncapped. The disposable syringe bag is ribbed in construction and comprises an injection port for filling the medication, the syringe bag nozzle for releasing the medication, and collapsing sides that collapse upon application of pressure. The disposable syringe bag is oval in cross-section to match the shape of the shell. The disposable syringe bag is fitted into the shell, the nozzle is uncapped, and the disposable syringe bag empties upon pressure from the plunger head. The disposable syringe bag is held in shape and made to collapse via the syringe bag ribs, which are partly rigid oval rings, running circumferentially along the syringe bag.

Other aspects, advantages, and salient features of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. Reference will now be made to the accompanying diagrams which illustrate, by way of an example, and not by way of limitation, of one possible embodiment of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS The following drawings are illustrative of particular examples for enabling systems and methods of the present invention, are descriptive of some of the methods and mechanism, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.

Figure 1 is a schematic illustration of the assembled portable and wearable syringe infusion pump in accordance with a preferred embodiment of the present invention. Figure 2 is a schematic cross-sectional top view of base of the portable and wearable syringe infusion pump in accordance with the preferred embodiment of the present invention.

Figure 3 is a schematic cross-sectional side view of base of the portable and wearable syringe infusion pump in accordance with the preferred embodiment of the present invention.

Figure 4 is a schematic cross-sectional side view of inner cylinder of the portable and wearable syringe infusion pump in accordance with the preferred embodiment of the present invention.

Figure 5 is a schematic cross-sectional side view of outer cylinder of the portable and wearable syringe infusion pump in accordance with the preferred embodiment of the present invention.

Figure 6 is a schematic cross-sectional view of shell of the portable and wearable syringe infusion pump in accordance with the preferred embodiment of the present invention.

Figure 7 is a schematic cross-sectional view of ribbed disposable syringe bag of the portable and wearable syringe infusion pump in accordance with the preferred embodiment of the present invention.

Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may represent both hardware components of the system. Further, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE INVENTION

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, persons skilled in the art will recognize that various changes and modifications to the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

The terms and words used in the following description are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to the person skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

The present invention relates to a portable and wearable syringe infusion pump used for intravenous or subcutaneous, continuous or interrupted infusion of various types of medication/drug as prescribed by the doctor to the patient.

The present invention also provides a portable and wearable syringe infusion pump which is cylindrical in shape. The portable and wearable syringe infusion pump consists of two detachable parts including a front part called a shell and a rear part called a base. Once the medication/drug is loaded, these two parts are fitted together and locked to assemble the portable and wearable syringe infusion pump. After assembling of the portable and wearable syringe infusion pump, it is switched on to begin infusion of the medication/drug. Further, the pump does not use conventional syringes to hold and inject the drug/medication, instead a syringe bag is used for the purpose of injection of drug/medication.

Thus the aforementioned infusion pump can hold, for example, 50 ml of fluid, same as other infusion pumps. Whether the infusion pump is completely loaded with the drug or completely empty, the external dimensions of the infusion pump is retained that is, for example, approximately 15 x 5 x 3 cm. The infusion pump is wearable and comfortable to the patient, and possesses a high degree of versatility and functionality.

The portable and wearable syringe infusion pump includes the following units: PLUNGER- The plunger contains three moving parts that allow it to cover a distance of around 10 cm - a central screw surrounded by plurality of cylinder and usually contains two concentric cylinders of increasing diameter. The central screw is positioned above base level and designed to cover a vertical distance of around 2 cm. The central screw is connected to a motor with a gear mechanism which rotates at the programmed rate, depending on the requirement, including the need for bolus injection. Surrounding the screw are two concentric cylinders, the outer one being fixed to the plunger head which is oval in shape like the shell, and therefore not allowed to rotate. Once the screw begins to rotate, it pushes the cylinders-plunger head assembly up. In the current state of art, all other existing devices work by anchoring the syringe and plunger between two moving parts and then pushing the plunger forward. This takes up space and increases the external dimensions of the device when the syringe is fully loaded. The infusion pump design disclosed here retains the same external size irrespective of the quantity of drug remaining. SHELL - Shell is the outer cover and oval in cross-section. The oval cross section of the shell is unique and serves two important functions. Firstly, it does not dig into the skin when strapped to the arm/thigh or bulge out of the clothes and is thus comfortable to the patient. Secondly, it stabilizes the plunger mechanism and keeps it aligned despite the fact that it consists of moving parts, some of which are only partially anchored. SYRINGE BAGS - Syringe bags are sealed, flexible, lightweight, sterile, use- and-throw bags. The syringe bag is also oval in cross-section. The syringe bags are easy to store in a collapsed state, each will take up the space of a large coin. This is advantage over conventional syringes which take up storage space. The unique design of the syringe bag is that the rim consists of partly rigid plastic rings which retain the shape and also the syringe bag to collapse evenly in an orderly fashion and not buckle. CONCENTRIC CYLINDERS - The concentric cylinders are hollow, fitting one over the other, approximately 4 cm long each. Each of them has 2-4 tunnels in the rim running through the entire length, so as to allow secure anchorage (so that one or all cylinders don’t lean sideways during unfolding) as well as smooth movement. To ensure minimal friction, the whole cylinder assembly has a lubricating mechanism, so that it self-lubricates every time it is in resting position. ARDUINO - Arduino is a tiny microprocessor or equivalent and can easily be fitted on the infusion pump. The Arduino microprocessor allows tremendous dose flexibility in terms of bolus doses, dose adjustment and interruptions. STEPPER MOTOR with GEAR SYSTEM - The infusion pump requires very low RPM rotation rates in addition to high torque commensurate with slow infusions. The conventional DC motors cannot achieve this. So, a bipolar stepper motor is used which can achieve these low infusion rates especially if coupled with a gear system. Figure 1 is a schematic illustration of the assembled portable and wearable syringe infusion pump 50 which includes the disposable ribbed syringe bag 1 with the injection port 13 in syringe bag 1 for filling a drug, a syringe bag nozzle 14, syringe bag collapsing sides 15, the drug filled in syringe bag 8, and syringe bag ribs 16, a plunger head 2, an inner cylinder 3 with grooves and includes hollow columns 20 for anchoring spikes 5, a screw shaft 4 at the center with grooves, an outer cylinder 6 with grooves, grooves 7 in base for cylinders 3 and 6 while in resting position, a motor 9 with gear mechanism, a base plate 12 as shown in Figure 2, with locking projection 11 for base part, and a shell 17 with shell nozzle 18, shell handles 19 for straps and a locking unit 10 for shell part.

A portable and wearable syringe infusion pump 50 comprises a screw shaft 4, a geared motor 9, one or more cylinders 3 and 6, a set of anchoring spikes 5, a shell 17, and a disposable syringe bag 1. The screw shaft 4 is mounted on a center of a base plate 12 and the geared motor 9 is positioned below the screw shaft 4 to drive the screw shaft 4. The cylinders 3 and 6 comprise an inner cylinder 3 and an outer cylinder 6 concentrically positioned with each other over the screw shaft 4. The anchoring spikes 5 are attached to the inner cylinder 3 to anchor the inner cylinder 3, wherein the outer cylinder 6 is fixed to an oval shaped plunger head 2 that constrains rotation of the outer cylinder 6, wherein beyond a predetermined height the inner cylinder 3 is free of the anchoring to rotate and lock the inner cylinder 3 with the screw shaft 4 to push the outer cylinder 6 and plunger head 2 upwards. The shell 17 comprises a shell nozzle 18 positioned concentrically above the cylinders 3 and 6 and the disposable syringe bag 1 is positioned within the shell 17, the shell 17 is filled with medication, and the outer cylinder 3 and plunger head 2 pushes upwards through the disposable syringe bag 1 to push the medication outward via a syringe bag nozzle 14. Figure 2 is top cross-sectional view of a base plate 12 of the portable and wearable syringe infusion pump 50 that is oval in shape and comprises screw shaft 4 with grooves, a motor with gear mechanism or a geared motor 9 , grooves 7 in base for cylinders 3 and 6 while in resting position and locking projection 11 for the base plate 12. The screw shaft 4 with grooves is mounted at the center of the base plate 12 and thereafter contains the geared motor 9 outside the screw shaft 4. The grooves 7 are positioned on the base plate 12 to support the cylinders 3 and 6 while in resting position and finally on the outer part is of the locking projection 11 for the base part 12.

Figure 3 is a schematic cross-sectional side view of base of the portable and wearable syringe infusion pump 50 incudes in the center screw shaft 4 with grooves surrounded by multiple cylinders 3 and 6 and usually contain two concentric cylinders 3 and 6 of increasing diameter. The central screw 4 is positioned above base level and designed to cover a vertical distance of, for example, about 2 cm. The central screw shaft 4 is connected to a geared motor 9 which functions using the gear mechanism and rotates at a programmed rate, depending on the requirement, including the need for bolus injection. Surrounding the screw 4 are two concentric cylinders 3 and 6, the outer cylinder 6 being fixed to the plunger head 2 which is oval in shape like the shell 17, and therefore not allowed to rotate. Once the screw shaft 4 begins to rotate, it pushes the cylinders 3, 6 and plunger head 2 assembly up. Further, the base also includes grooves 7 for cylinders 3 and 6 while in resting position.

Figure 4 is a schematic cross-sectional side view of inner cylinder 3 of the portable and wearable syringe infusion pump 50 which is anchored in the horizontal plane by anchoring spikes 5 to a certain level. Beyond a certain height, the inner cylinder 3 is free of its anchoring and is therefore free to rotate. The inner cylinder 3 then locks on to the screw shaft 4 and begins to rotate with the screw shaft 4. The inner cylinder 3 is now become part of the screw shaft 4 and pushes the outer cylinder 6 and plunger head 2 upwards. Between the two cylinders 3 and 6, a vertical distance of 8 cm is covered. Further, the inner cylinder 3 also includes hollow columns 20 for anchoring spikes.

Figure 5 is a schematic cross-sectional side view of outer cylinder 6 of the portable and wearable syringe infusion pump 50 with grooves and is connected with the plunger head 2. The outer cylinder 6 is fixed to the plunger head 2 that is oval in shape like the shell 17 and the outer cylinder 6 does not allow the central screw shaft 4 to rotate. Once the screw shaft 4 begins to rotate, and pushes the cylinders-plunger head 2 assembly up. The cylinders 3 and 6 are unable to rotate because the inner cylinder 3 that is anchored in the horizontal plane by spikes 5, to a certain level and the outer cylinder 6 is fixed to the plunger head 2 which is fixed by the oval shape.

Beyond a certain height, the inner cylinder 3 is free of its anchoring and is, therefore free to rotate. The inner cylinder 3 then locks on to the screw shaft 4 and begins to rotate with the screw shaft 4. The inner cylinder 3, therefore, works in together with the screw shaft 4 and pushes the outer cylinder 6 and plunger head 2 towards upward direction. Between the two cylinders 3 and 6, a vertical distance of 8 cm is covered, sequentially this process is repeated till 10 cm is covered.

Thus, the screw shaft 4 is followed by the inner cylinder 3 and the inner cylinder 3 is followed by the outer cylinder 6. So, the speed of rotation is automatically adjusted for minor changes in diameter and this is programmed into the infusion pump 50 by means of the Arduino code.

To rewind this mechanism, the screw shaft 4 rotates in the opposite direction and the whole assembly of the infusion pump 50 rewinds and thus is ready to work. Figure 6 is a schematic cross-sectional view of shell 17 of the portable and wearable syringe infusion pump 50 which includes shell nozzle 18, shell handles 19 for straps and locking unit 10. The shell 17 is a rigid, transparent, hollow, oblong cylinder, oval in cross-section, with internal dimensions of, for example, 4 x 2 cm. The shell 17 has handles 19 on either side for attachment of straps, for wearing on the arm or thigh. The shell 17 also has a locking mechanism 19 for securely holding the base in position once it is inserted in place. Thus, the shell 17 is open at the rear end, and has a nozzle 18 in front through which the nozzle of the syringe bag is inserted and uncapped. Within the inner lumen are longitudinal furrows to ensure stability of the plunger head 2 during its movement through the shell 17.

Figure 7 is a schematic cross-sectional view of ribbed disposable syringe bag 1 of the portable and wearable syringe infusion pump 50. The ribbed disposable syringe bag 1 includes injection port 13 for filling drug/medication, syringe bag nozzle 14, syringe bag collapsing sides 15 and syringe bag ribs 16.

The syringe bag 1 is the only disposable part of the infusion pump 50. The syringe bag 1 is a sterile, use-and-throw, collapsible, ribbed, thin container, with a flat base and the nozzle 14 in front. At the front end, next to the nozzle 14 is a rubber injection port 13, for filling the drug/medication. The syringe bag 1 is oval in cross-section, to match the shape of the shell 17, into which it is inserted when filled. The syringe bag 1 is to be supplied in a collapsed state, in sterile blister packs, like tablets. When empty, the size of a syringe bag 1 would be like a large coin, thus affording tremendous saving on storage space. The syringe bag 1 only fills up when drug is injected through the injection port 13. Once the syringe bag 1 is fitted into the infusion pump, the nozzle 14 is uncapped, and the syringe bag 1 only empties once it is pressured from behind by the plunger head 2. The syringe bag 1 is held in shape and made to collapse in an orderly fashion by the syringe bag ribs 16, which are partly rigid oval rings, running circumferentially along the syringe bag. Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore, contemplated that such modifications can be made without departing from the spirit or scope of the present invention as defined.