Patent Description:
A bilaterally driven drug infusion device with multiple infusion modes is a medical device that achieves treatment of a patient's physiological condition by continuously injecting a drug into a patient. Bilaterally driven drug infusion device with multiple infusion modes are widely used for the treatment of diabetes, allowing required doses of insulin to be continuously infused into the subcutaneous tissue of the patient's body, thereby simulating the secretion function of the pancreas, thereby keeping the patient's blood sugar stable. The drug fluid is usually stored inside the infusion pump. The existing bilaterally driven drug infusion device with multiple infusion modes usually attaches the pump body directly to the patient's body through a medical adhesive tape, and the patient operates a remote device to control infusion. <CIT> relates to fluid delivery devices and infusion pumps for delivering therapeutic fluids to patients. <CIT> relates to a unilateral driving mechanism for a portable infusion system.

In the case of drug infusion, the current infusion devices can only operate with one level of increment, therefore, the infusion process cannot be flexibly controlled, and the infusion efficiency is relatively low. Moreover, the minimum dose that can be infused each time is relatively large, which can cause the concentration of some substance(s) in a patient's body fluid to fluctuate greatly under the control of the infused drug, and cannot achieve the purpose of more accurately controlling the concentration of that substance(s).

Therefore, there is a need in the prior art for a bilaterally driven drug infusion device with multiple infusion modes that can flexibly control a drug infusion process and improve drug infusion efficiency.

The embodiment of the invention discloses a bilaterally driven drug infusion device with multiple infusion modes. The driving unit has multiple-mode operation, thus realizing driving the driving wheel in multiple-mode rotations and making the infusion device have multiple infusion increments or infusion rates. The user can flexibly control the infusion process, which improves the infusion efficiency.

The invention discloses a bilaterally driven drug infusion device with multiple infusion modes, comprising: a drug storage unit; a piston and a driving wheel respectively connected with a screw, the driving wheel, provided with wheel teeth, drives the screw movement by rotation, the piston is arranged in the drug storage unit, the screw advances the piston to move; a driving unit cooperating with the driving wheel; and a power unit, connected to the driving unit, outputs forces in two different directions on the driving unit to lead driving unit to perform multiple-mode operation, making the infusion device have multiple infusion increments or infusion rates.

According to an aspect of the present invention, the multiple-mode operation of the driving unit includes the movement amplitude or the movement rate, therefore, the different multiple-mode operations of the driving unit include multiple different movement amplitudes or multiple different movement rates.

According to an aspect of the present invention, it further includes a pivot shaft, and the driving unit includes at least two driving arms, and the driving unit pivots around the pivot shaft to drive driving arms to move.

According to an aspect of the present invention, the driving wheel includes at least two sub-wheels, and the driving arm rotates the driving wheel by engaging the wheel teeth.

According to an aspect of the present invention, the pivot shaft is disposed between the two sub-wheels, one or more driving arms are respectively disposed on both sides of the driving unit, and each sub-wheel cooperates with at least one driving arm.

According to an aspect of the present invention, one movement amplitude corresponds to one kind of pivot mode of the driving unit, and the driving unit, pivoting in various pivot modes, drives the driving arm to rotate the driving wheel to implement increment-adjustable infusion, and each increment-adjustable infusion corresponds to an infusion increment.

According to an aspect of the present invention, multiple-mode pivot of the driving unit includes:
after pivoting one or more steps in one direction in a single time, the driving unit starts pivoting one or more steps in another direction until the end of the pivot in this direction, the driving unit completes an alternate pivot in both directions to perform multiple-mode driving on the driving wheel.

According to an aspect of the present invention, two driving arms are installed on each side of the driving unit, and two driving arms on one side of the driving unit are installed up and down, or are installed left and right.

According to an aspect of the present invention, the horizontal distance between the driving ends of the two driving arms on one side of the driving unit is h, the pitch of the wheel teeth is s, <NUM>s ≤ h ≤ <NUM>s.

According to an aspect of the present invention, <NUM>s ≤ h ≤ <NUM>s.

According to an aspect of the present invention, the wheel teeth are ratchet teeth, and during the whole process of driving unit pivoting in one direction, the driving unit alternately pivots and stops for multiple times to drive driving arms to alternately engage and stop engaging the ratchet teeth, so that the driving wheel alternately rotates and stops rotation to perform tooth number adjustable rotation.

According to an aspect of the present invention, when the driving unit drives the driving wheel, at least one of the driving arms on one side engages the wheel teeth, while the driving arm on the other sides of the driving unit slide on the wheel teeth.

According to an aspect of the present invention, multiple-mode pivot of driving unit comprise: large mode and small mode, and when the infusion is performed, the driving unit can switch between the large mode and the small mode to realize increment-adjustable infusion.

According to an aspect of the present invention, multiple-mode pivot of the driving unit further comprise: one or more intermediate modes, wherein the intermediate mode is between the large mode and the small mode, and the driving unit can switch among the large mode, the intermediate mode and the small mode to achieve the increment-adjustable infusion.

According to an aspect of the present invention, it further includes a base on which the driving wheel is movably assembled, and the base and the driving wheel are frictional fit, and the driving wheel stops rotating when the driving arm is sliding on the surface of the wheel teeth.

According to an aspect of the present invention, it further includes a position limited member which is movably assembled on the base to limit the position of the driving wheel, and the position limited member and the driving wheel are frictional fit, and the driving wheel stops rotating when all of the driving arms are sliding on the surface of the wheel teeth.

Compared with the prior art, the technical solution of the present invention has the following advantages:
In the bilaterally driven drug infusion device with multiple infusion modes disclosed by the present invention, the power unit outputs forces in two different directions on the driving unit to lead driving unit to perform multiple-mode operation, making the infusion device have multiple infusion increments or infusion rates. The driving unit has a variety of different pivot amplitudes, that is, the driving unit can realize multiple-mode pivot, thereby achieving increment-adjustable infusion. In addition, the driving unit also includes various movement rates, which makes the infusion process more flexible and controllable and significantly improves the efficiency of drug infusion. At the same time, this invention also reduces the minimum drug infusion dosage, accurately controls the process of the drug infusion, effectively avoids large fluctuations of concentration of some substance(s) in patient's body fluid and enables the patients to control and manage their physiological condition more precisely.

Furthermore, in the solution of the present invention, during the whole process of the driving unit pivoting in one direction, the driving unit alternately pivots and stops in an adjustable way to drive the driving arms to alternately engage and stop engaging the ratchet teeth, so that the driving wheel alternately rotates and stops rotation to perform tooth number adjustable driving on the driving wheel. In a single rotation in one direction, adjustable pivoting of the driving unit helps delivering the infused drug in several steps by means of a pivot-stop-pivot-stop-. -pivot-stop alternating method to achieve accurate infusion.

Furthermore, multiple-mode pivot of the driving unit includes large mode and small mode. Patients can freely choose and switch large mode or small mode infusion according to the actual infusion volume and infusion rate requirements, making the infusion process more flexible and controllable, greatly improving the infusion efficiency.

Furthermore, a plurality of movement modes of the driving unit further comprise: one or more intermediate modes. Setting intermediate modes provides more infusion options for the patient and the patient's control of the infusion process is more flexible.

Furthermore, the infusion device further includes a base which is frictional fit with the driving wheel. The driving wheel stops rotating when the driving arm is sliding on the surface of the wheel teeth, improving the accuracy of drug infusion and eliminating potential safety hazards.

As previously mentioned, prior art infusion devices have only one unadjustable infusion mode and do not have the flexibility to control the infusion process.

It has been found through research that the above mentioned problems are caused by the fact that the driving unit in the prior art infusion device has only one operating mode (or only one pivot mode), which results in a relatively simple control of the infusion process in the prior art.

In order to solve this problem, the present invention provides a bilaterally driven drug infusion device with multiple infusion modes in which a driving unit has multiple-mode operation to perform tooth-number adjustable driving on the driving wheel. The different options of increment allow patients to flexibly control the drug infusion process. At the same time, the minimum drug infusion amount of the infusion device is effectively reduced, and the fluctuation of concentration of some substance(s) in patient's body fluid is mitigated.

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. The relative arrangement of the components and the steps, numerical expressions and numerical values set forth in the embodiments are not to be construed as limiting the scope of the invention.

In addition, it should be understood that, for ease of description, the dimensions of the various components shown in the figures are not necessarily drawn in the actual scale relationship, for example, the thickness, width, length or distance of certain units may be exaggerated relative to other structures.

The following description of the exemplary embodiments is merely illustrative, and is not intended to be in any way limiting the invention and its application or use. The techniques, methods and devices that are known to those of ordinary skill in the art may not be discussed in detail, but such techniques, methods and devices should be considered as part of the specification.

It should be noted that similar reference numerals and letters indicate similar items in the following figures. Therefore, once an item is defined or illustrated in a drawing, it will not be discussed further in the following description of the drawings.

<FIG> is a top view of an infusion device according to an embodiment of the present invention. The infusion device includes a driving unit <NUM>, a driving wheel <NUM>, a drug storage unit <NUM>, a piston <NUM>, a screw <NUM>, and a power unit <NUM>.

The screw <NUM> is coupled to the piston <NUM> and the driving wheel <NUM>, respectively. In the embodiment of the present invention, the driving wheel <NUM> is movably mounted on the device base <NUM>, and the driving wheel <NUM> moves the driving screw <NUM> through rotation to advance the piston <NUM> disposed in the drug storage unit <NUM> to move forward for the purpose of injecting drugs.

The driving unit <NUM> cooperates with the driving wheel <NUM>. Here, the cooperation means that the movements of both the driving unit <NUM> and the driving wheel <NUM> are interrelated to each other.

In the embodiment of the present invention, the driving wheel <NUM> is provided with wheel teeth <NUM> (as shown in <FIG>). The driving unit <NUM> is movably connected to the base <NUM> through a pivot shaft <NUM>, and the driving unit <NUM> can pivot around the rotating shaft <NUM>. The driving unit <NUM> includes at least two driving arms <NUM>. The pivoting driving unit <NUM> drives the driving arm <NUM> to engage the wheel teeth <NUM> forward to rotate the driving wheel <NUM>.

The power unit <NUM> outputs two different directional forces on the driving unit <NUM>, making the driving unit <NUM> have different multiple-mode operation. Here, the operation mode includes the amplitude or rate of the movement. Therefore, the multiple-mode operation of the driving unit <NUM> includes various movement amplitudes or movement rates, which will be described in detail below.

Specifically, in the embodiment of the present invention, the power unit <NUM> is fixedly connected at the top position <NUM> of the driving unit <NUM>, thereby dividing the power unit <NUM> into two left and right portions, such as the A' direction portion and the B' direction portion in <FIG>. The driving unit <NUM> is alternately led to pivot in the A' direction or the B' direction through the pivot shaft <NUM>. Specifically, in the embodiment of the present invention, when the power unit <NUM> leads the driving unit <NUM> to A' direction, the driving unit <NUM> pivots in A direction through the pivot shaft <NUM>. When the power unit <NUM> leads the driving unit <NUM> in the B' direction, the driving unit <NUM> pivots in B direction through the pivot shaft <NUM>. By alternately leading the driving unit <NUM> in A' direction and B' direction, the driving unit <NUM> can alternately pivot through the pivot shaft <NUM> in the A direction and the B direction.

Specifically, in the embodiment of the present invention, the power unit <NUM> is made of shape memory alloy. The A' direction portion and the B' direction portion of the shape memory alloy are alternately powered on and off, and a leading force is applied to the driving unit <NUM> by a change in the length of the power unit <NUM> thereof. The power unit <NUM> may be composed of one piece of shape memory alloy, or may be composed of left and right segments (such as the A' direction segment and the B' direction segment) of shape memory alloy, and is not specifically limited herein, as long as the force can be applied to lead the driving unit <NUM> pivot.

Here, it should be noted that the power unit <NUM> includes but is not limited to a shape memory alloy. In other embodiments of the present invention, the power unit <NUM> may also be other structures, and the location where the power unit <NUM> applies force to the driving unit <NUM> is also not limited to the top position <NUM>, as long as the action of applying a force to the driving unit <NUM> can be satisfied to cause the driving unit <NUM> to alternately pivot left and right.

Obviously, by controlling the magnitude of the power output by the power unit <NUM>, the driving unit <NUM> will have various movement amplitudes. As in the embodiment of the present invention, by controlling the magnitude of the current, the length of the shape memory alloy will change, changing the magnitude of the power and the movement amplitude of the driving unit <NUM>. Therefore, the driving unit <NUM> has various movement amplitudes. One movement amplitude of the driving unit <NUM> corresponds to one kind of pivot mode, and therefore, the driving unit <NUM> has multiple-mode pivot.

Similarly, by controlling the frequency of the power output by the power unit <NUM>, the driving unit <NUM> will have various movement rates. As in the embodiment of the present invention, by changing the energization frequency, the frequency of the power output also changes, thus changing the movement rate of the driving unit <NUM> accordingly.

Referring to the perspective view of the driving unit <NUM> shown in <FIG>, the driving unit <NUM> further includes more than two driving arms <NUM>. The driving wheel <NUM> includes a plurality of sub-wheels. Referring to the structure shown in <FIG>, when a plurality of driving arms <NUM> are installed on one side of the driving unit <NUM>, the driving unit <NUM> can drive the driving arms <NUM> to engage the wheel teeth <NUM> through adjustable pivoting to rotate the driving wheel <NUM> by an optional number of teeth. Thus, in an embodiment of the invention, the driving unit <NUM> and the driving wheel <NUM> are designed to work compatibly, which means that the position of the driving wheel <NUM> and the number of the sub-wheels need to be compatible with the working principle of the driving unit <NUM> and the number, position and structure of the driving arms <NUM>.

As shown in <FIG>, in the embodiment of the present invention, a plurality of driving arms <NUM> are installed on each side of the driving unit <NUM>. Therefore, a plurality of sub-wheels are also installed on both sides of the driving unit <NUM> to cooperate with the driving arms <NUM>. Specifically, in the embodiment of the present invention, the driving unit <NUM> includes fourdriving arms <NUM>, which are 110a, 110b, 110c, and 110d, respectively. 110a, 110b are installed on one side of the driving unit <NUM>, while 110c, 110d are installed on the other side of the driving unit <NUM>. The driving wheel <NUM> includes two sub-wheels, one of which cooperates with 110a, 110b and the other of which cooperates with 110c, 110d.

It should be noted that the driving wheel <NUM> may further include more than two sub-wheels. For example, according to the design of the position and structure of the plurality of driving arms <NUM>, two adjacent sub-wheels may be set on one side of the driving unit <NUM> to cooperate with different positions, numbers of driving arms <NUM> on this side of the driving unit <NUM>.

<FIG>, <FIG> are respectively a schematic view of a three-dimensional, a side view, and a top view of the driving unit <NUM>, and the top view direction of <FIG> is the direction indicated by the arrow in <FIG>, while the side view direction of <FIG> is the direction shown by the arrow in <FIG>.

In the embodiment of the present invention, the two driving arms <NUM> on one side of the driving unit <NUM> are installed up and down. Here, the up and down settings refer to the up and down positional relationship representations shown in <FIG>. Specifically, the two driving arms <NUM> (such as 110a and 110b) on the side of the driving unit <NUM> can be seen in the side view <FIG>, and in the top view <FIG>, 110b and 110d are blocked by 110a and 110c, respectively, wherein 110b and 110d are indicated by dotted lines in <FIG>.

In the embodiment of the present invention, since the driving wheel <NUM> is circular, the surfaces on which the adjacent teeth are applied with the engaging force are not parallel. Therefore, in order to keep the angle between the driving arms <NUM> and the teeth engaging surface <NUM> degree during engaging, thereby improving the engaging efficiency of the driving arms <NUM>, when the driving arms <NUM> on one side of the driving unit <NUM> engage the wheel teeth <NUM>, the lines representing the engaging directions of the two driving arms <NUM> intersect each other. Specifically, as shown in <FIG>, when the wheel teeth <NUM> are engaged by 110a and/or 110b, the straight line where 110a is located is I<NUM>, the straight line where 110b is located is I<NUM>, wherein the angle between I<NUM> and I<NUM> is α, <NUM>°≤ α ≤ <NUM>°. Specifically, in the embodiment of the present invention, α = <NUM>°. In another embodiment of the invention, α = <NUM>°. In still another embodiment of the invention, α = <NUM>°.

It should be noted that, in other embodiments of the present invention, according to different structural designs, when the driving arms <NUM> on one side of the driving unit <NUM> engage the wheel teeth <NUM>, the lines representing the engaging directions of these two driving arms <NUM> can also be parallel (α = <NUM>°) or skew with a structure also able to drive the driving wheel <NUM> to rotate to achieve the purpose of drug infusion. In this case, the angle α between I<NUM> and I<NUM> may be set according to the actual structure, such as according to the diameter, number of the driving wheel <NUM>, the number of the wheel teeth <NUM>, the pitch of the screw <NUM>, the positional relationship and the number of the driving arms <NUM>. For example, α may be between <NUM>° ~ <NUM>°or <NUM>°< α ≤ <NUM>°, and is not specifically limited herein.

As shown in the dotted portion <NUM> of <FIG> and <FIG>, in the embodiment of the present invention, the two driving arms <NUM> on one side of the driving unit <NUM> are formed by folding at the dotted circle <NUM>. In other embodiments of the present invention, the two driving arms <NUM> on one side of the driving unit <NUM> may also be formed by other means. As shown in the perspective view of the driving unit shown in <FIG>, the up position 210a, 210c and the down position 210b, 210d are respectively set in different structural subunits. As in <FIG>, the two structural subunits are secured together by welding or other means of attachment to form one single structure. And as shown in <FIG>, the two structural subunits are connected at the top position <NUM> of the driving unit <NUM>, and then the top position <NUM> of the driving unit <NUM> is folded over to form the structure of the driving arms <NUM> in the embodiment of the present invention.

It should be noted that, in other embodiments of the present invention, the driving arms may be formed by other means, as long as the arms are able to drive the driving wheel to rotate, and is not specifically limited herein.

Please refer to <FIG>, which is a top view of a driving unit <NUM> according to another embodiment of the present invention.

The angles of view of <FIG> and <FIG> are the same. According to <FIG>, <FIG>, <FIG> and <FIG>, it is apparent that the two driving arms on one side of the driving unit <NUM> are slightly offset from left and right, such as 410a, 410b and 410c, 410d. Specifically, in one embodiment of the invention, 410a and 410c are offset to the right and 410b and 410d are offset to the left.

It should be noted that, in other embodiments of the present invention, the left and right offset degree of the two driving arms on the same side and the direction in which the two are offset relative to each other need to be determined according to the actual structural design, and are not limited specifically described herein. Furthermore, in an embodiment of the invention, the two driving arms on one side of the driving unit can also be installed left and right. Here, the left and right installing mean that from the perspective of <FIG> (top view), two complete driving arms on one side of the driving unit can be seen, while from the perspective of <FIG> (side view), the driving arms close to the main body of the driving unit is completely or partially blocked by the driving arms away from driving unit's main body. In this case, the lines presenting the engaging directions of driving arms on the same side of driving unit is coplanar or skew. At the same time, there is no particular limitation on the length or the length relationship among different driving arms.

Please refer to <FIG>, which is a schematic perspective view of a driving unit <NUM> according to still another embodiment of the present invention.

Specifically, the driving unit <NUM> includes six driving arms <NUM>, each three of which are installed on one side of the driving unit <NUM>. Specifically, 510a, 510b, and 510c are installed on one side, and 510d, 510e, and 510f are installed on the other side. As described above, the lengths, the length relationships and the positional settings of the driving arms <NUM> on the same side are designed according to the specific structure and working principle, and are not specifically limited herein. Specifically, in the embodiment of the present invention, the positional relationship of the three driving arms <NUM> on the same side of the driving unit <NUM> is similar to that in <FIG>, <FIG>, that is, the three driving arms <NUM> on the same side of the driving unit <NUM> are installed up and down.

It should be noted that, in other embodiments of the present invention, the total number of driving arms may also be an odd number, such as three, five or more, that is, the numbers of driving arms on both sides of the driving unit are not equal. Moreover, the structural relationship between the different driving arms can be similar to that described above, and no specific restrictions are imposed here.

Referring to <FIG> and <FIG> together, <FIG> is a partial structural diagram of the driving wheel <NUM>, and wheel teeth <NUM>.

In the perspective of <FIG>, the horizontal distance between the driving ends of the two driving arms on one side of the driving unit <NUM> is h, and the pitch of the wheel teeth <NUM> is s, then <NUM>s ≤ h ≤ <NUM>s. Specifically, in the embodiment of the present invention, h = <NUM>. In another embodiment of the invention, h = <NUM>s. In still another embodiment of the invention, h = s. Here, the driving end of the driving arms <NUM> refers to the end of the driving arms <NUM> that directly contacts the wheel teeth <NUM> when engaged. The horizontal distance refers to the distance between two projection points of the driving ends of the two driving arms <NUM> on the same side of the driving unit <NUM> on a plane when viewed in an angle as shown in <FIG>.

It should be noted that in other embodiments of the present invention, <NUM>s ≤ h < <NUM>s or <NUM>s < h ≤ <NUM> may be used, and the effects of the present invention may be also achieved, and also are not specifically limited herein.

As shown in <FIG>, in the embodiment of the present invention, the driving wheel <NUM> is a ratchet, and the wheel teeth <NUM> are ratchet teeth. Each ratchet tooth surface includes a gentle surface and a steep surface, therefore it's easy to be engaged, as shown in <FIG>. Moreover, in the embodiment of the present invention, the driving arms <NUM> of the driving unit <NUM> include a portion that drives the driving wheel <NUM> to rotate and a portion that does not drive the driving wheel <NUM> to rotate during the entire pivot of the driving unit <NUM> in one direction. The portion that drives the driving wheel <NUM> to rotate applies the engaging force on the steep surface of the ratchet teeth, in order to drive the driving wheel <NUM> to rotate in the C direction.

Please refer to <FIG>, which is a schematic perspective view of the driving unit <NUM> and the driving wheel <NUM>.

With reference to <FIG>, <FIG>, <FIG>, in the embodiment of the present invention, under the action of the power unit <NUM>, the driving unit <NUM> pivots around the pivot shaft <NUM>, thereby driving the plurality of driving arms <NUM> on both sides of the driving unit <NUM> to engage the wheel teeth <NUM> for rotation of the driving wheel <NUM>.

Referring to <FIG> and <FIG> together, <FIG> is a schematic structural diagram of the adjustable pivoting movements of the driving unit <NUM>
As described above, the driving unit <NUM> has a certain distance h between the driving ends of the driving arms <NUM> on the same side, and there is a certain angle α between the lines representing the driving directions when the arms are engaged. And therefore, the driving unit <NUM> pivots in one direction in a single time throughout the process, as shown in <FIG> in a single pivot in the direction A, 110a and/or 110b engage the wheel teeth <NUM> to drive the driving wheel <NUM>, while 110c and 110d can slide on the wheel teeth <NUM> (as on the gentle surface of the ratchet teeth, but not exert a force for driving the driving wheel <NUM> to rotate). And obviously, 110c slides to the next driving position first. Here, the driving position refers to the position where the driving arm can engage the wheel teeth to advance, so as to the following driving position. At this time, the driving end of 110c acts on the steep surface of the ratchet teeth. At this time, the driving unit <NUM> stops pivoting and the driving arms 110a and/or 110b stop engaging the wheel teeth <NUM>, and the driving wheel <NUM> stops rotating. Thus the driving unit <NUM> completes one step of pivot. Referring to <FIG>, the driving unit <NUM> pivots in the A direction to reach A<NUM> position, which corresponds to one kind of pivot amplitude, making the infusion device have an infusion increment. The next moment the driving unit <NUM> continues to pivot in the A direction, 110d will slide to the next driving position. Similarly, the driving end of 110d also acts on the steep surface of the ratchet teeth. Thus the driving unit <NUM> completes a second step of pivot. Referring to <FIG>, the driving unit <NUM> still pivots in the A direction to reach A<NUM> position, which corresponds to another kind of pivot amplitude, making the infusion device have another infusion increment. At this time, 110c and 110d respectively complete the sliding between adjacent wheel teeth <NUM>, and the driving unit <NUM> completes the whole process of single pivot in the A direction, reaching A<NUM> and A<NUM> positions respectively, thereby driving the driving wheel <NUM> to rotate by two steps, realizing two-step infusion of the drug device and making the infusion device have two different infusion increments.

It should be noted that, in the above pivoting process, 110d may first slide to the next wheel teeth <NUM>, and then 110c slide to the next wheel teeth <NUM>, which is not specifically limited herein. Similarly, when the driving unit <NUM> pivots in the B direction, it can reach B<NUM> and B<NUM> positions respectively, which also corresponds another two infusion increments.

Obviously, in the whole process of the above-mentioned single pivot in the A direction, the driving unit <NUM> undergoes an alternate action of pivot and stop, and the driving arms <NUM> alternately engage and stop engaging wheel teeth <NUM> to drive the driving wheel <NUM> to rotate and stop rotating, realizing two-step rotation of the driving wheel, and finally achieves two-level increment-adjustable drug infusion.

Specifically, when the driving unit has two driving arms on one side, the driving unit undergoes two-step movement of the pivot-stop-pivot-stop during the single pivot in the A direction, in order to drive driving wheel for two-step rotation. When the driving unit has three driving arms on one side, the driving unit performs the pivot-stop-pivot-stop-pivot-stop three-step motion in the whole process of single pivot in the A direction, realizing three-step rotation of the driving wheel to achieve three-level increment-adjustable drug infusion. By analogy, when there are more driving arms on one side of the driving unit, the driving unit realizes multiple-step driving of the driving wheel by the multiple-step actions of the pivot-stop-pivot-stop-pivot-. -pivot-stop, completing multi-level increment-adjustable drug infusion.

With continued reference to <FIG>, in combination with the above, in the embodiment of the present invention, when the driving unit <NUM> drives the driving wheel <NUM> to rotate, at least one of the driving arms <NUM> on the driving force side applies an engaging force to the wheel teeth <NUM>. While one or both of the driving arms <NUM> on the other side are in contact with the wheel teeth <NUM> without applying any force to the wheel teeth <NUM> to drive the driving wheel <NUM> to rotate. Therefore, there is a case in the embodiment of the present invention that only one of the driving arms <NUM> of the driving unit <NUM> engages the wheel teeth <NUM> to rotate the driving wheel <NUM>, and the other driving arms <NUM> are in contact with the driving wheel <NUM> without applying any force to the wheel teeth <NUM> to rotate the driving wheel <NUM>.

It should be noted that, in the embodiment of the present invention having three or more driving arms on one side of the driving unit, when the driving unit is in operation, the above-mentioned similar situation may also occur. When there are an odd number of driving arms, the numbers of driving arms on both sides of the driving unit are not equal, and the same process as above is also performed in the whole process of the driving unit rotating in a certain direction.

Referring to <FIG> again, in another embodiment of the present invention, when the driving unit <NUM> has two driving arms <NUM> on one side, the driving unit <NUM> pivots one step in the A direction, that is, reaching the A<NUM> position, and then pivots one or two steps in the B direction, that is, reaching the B<NUM> or B<NUM> position until the pivot in the B direction stops, the driving unit <NUM> pivoting by different amplitudes. This process completes the alternate pivot of the driving unit <NUM> in two directions, so that the driving wheel <NUM> can be rotated in multiple steps. Therefore, in the embodiment of the present invention, the driving unit <NUM> can alternately switch modes among A<NUM>-B<NUM> or A<NUM>-B<NUM>-B<NUM> or B<NUM>-A<NUM>-A<NUM>, so as to achieve the purpose of switching among different increments of infusion.

With continued reference to <FIG>, in another embodiment of the present invention, the driving unit <NUM> can also be pivoted directly to the A<NUM> position without passing through the A<NUM> position, then directly pivoted to the B<NUM> position without passing through the B<NUM> position, that is, the driving unit <NUM> alternately pivots between the A<NUM>-B<NUM> positions. As described above, the driving unit <NUM> can also alternately pivot between the A<NUM>-B<NUM> positions. Obviously, in a unit time, the dosage of infused drug when the driving unit <NUM> alternately pivots between the A<NUM>-B<NUM> positions is greater than the dosage of infused drug when it alternately pivots between the A<NUM>-B<NUM> positions.

In other embodiments of the present invention, as shown in <FIG>, after the driving unit <NUM> pivots in the direction A and the driving arm 110c or 110d slides to the driving position, the driving unit <NUM> may continue to pivot in the direction A until both the driving arm 110c and 110d are away from the driving position, the driving unit <NUM> stopping pivoting and starting to pivot in the B direction at the next moment. This operation mode enables the driving unit <NUM> to have more kinds of movement amplitudes, that is, multiple-mode pivot. Obviously, when the driving unit <NUM> pivots in the direction B for a certain period of time, all the driving arms <NUM> slide on the surface of the wheel teeth <NUM>, that is, no engaging is performed. For ease of description, the above process will be described in detail below in conjunction with an embodiment in which the driving unit <NUM> includes only two driving arms.

<FIG> are schematic structural views of the driving unit <NUM> including two driving arms 610a and 610b.

Similar to the driving principle described above, in one embodiment of the present invention, when the power unit <NUM> applies force to the driving unit <NUM> in the A' direction, the driving arm 610a engages the wheel teeth <NUM> forward, making the driving unit <NUM> pivot around the pivot shaft <NUM> and the driving arm 610b sliding on the surface of the wheel teeth <NUM> until the driving arm 610b reaches the driving position, in which the driving unit <NUM> pivots by a certain amplitude, as shown in <FIG>. The power unit <NUM> starts to apply force in the B' direction, making the driving arm 610b engage the wheel teeth <NUM> forward. By analogy, the driving unit <NUM> alternately pivots in two directions.

In the embodiment of the present invention, after the driving arm 610b reaches the driving position, the driving unit <NUM> continues to pivot in the direction A, thus the driving arm 610b continuing to slide on the surface of the wheel teeth <NUM>. After the distance between the driving end of the driving arm 610b and the steep surface of the wheel teeth <NUM> is d<NUM>, the power unit <NUM> stops outputting force, which is shown in <FIG>. At this time, the driving unit <NUM> pivots by a larger amplitude. If the pitch of the wheel tooth is D, then d<NUM> = D/n, n > <NUM>. Obviously, after the power unit <NUM> outputs force in the direction of B', both the driving arms 610b and 610a slide on the surface of the wheel teeth <NUM> within a period of time after the driving unit <NUM> starts to pivot, as shown in <FIG>. The distances between the driving arms 610b, 610a and the steep surfaces of their corresponding wheel teeth <NUM> are d<NUM> and d<NUM>, respectively. Obviously, d<NUM> < D and d<NUM> < D. As described above, when more driving arms are provided on the driving unit <NUM>, a similar situation will occur for each driving arm.

The total distance of the driving arm 610b sliding in the above process can be arbitrarily selected, for example, the total sliding distance is <NUM>D, <NUM>D, D (as shown in <FIG>), <NUM>D, <NUM>D, <NUM>D, <NUM>D, <NUM>D, etc. The driving unit <NUM> has various pivot amplitudes, that is, various rotation gears, making the infusion device have multiple infusion increments.

<FIG> are schematic diagrams of the driving wheel <NUM> and the base <NUM>, or the position limited member <NUM> according to an embodiment of the present invention. <FIG> are front views of partial structures in <FIG>.

When the driving arm <NUM> slides on the surface of the wheel teeth <NUM>, the driving arm <NUM>, contact with the wheel teeth <NUM>, applies a certain pressure to the driving wheel <NUM> to ensure the non-rotating of the driving wheel <NUM>. However, it is obvious that due to the structural features of the wheel teeth <NUM> and the circumference of the driving wheel <NUM>, the pressure applied by the driving arm <NUM> is not equal at different positions. Therefore, when the driving arm <NUM> slides (including reset movement or sliding forward) on the surface of the wheel teeth <NUM>, the driving wheel <NUM> may rotate forward or reverse, which affects the accuracy of the drug infusion volume and brings safety risk.

As shown in <FIG>, the driving wheel <NUM> is movably assembled on the base <NUM> remaining in frictional engagement. Here, the friction fit between these two means a certain friction force preset between two mutually moving structures, so as to the meaning of the following friction fit. In the embodiment of the present invention, the frictional force of the relative movement between the driving wheel <NUM> and the base <NUM> is applied or increased at the position L, indicated by the dotted frame, to ensure that when the driving arm <NUM> slides on the surface of the wheel teeth <NUM>, the driving wheel <NUM> stops rotating.

As shown in <FIG>, in another embodiment of the present invention, the infusion device further includes a position limited member <NUM> that is movably assembled on the base <NUM> to limit the position of the driving wheel <NUM>. The position limited member <NUM> is in friction fit with the driving wheel <NUM> at position M or position N, indicated by the dotted frame. Similarly, in the embodiment of the present invention, the position limited member <NUM> increases the frictional force that the driving wheel <NUM> receives when rotating, also ensuring that the driving wheel <NUM> stops rotating when the driving arm <NUM> slides on the surface of the wheel teeth <NUM>. At the same time, the position limited member <NUM> can make full use of the internal space of the infusion device, and frictionally cooperate with the driving wheel <NUM> at multiple positions.

Other embodiments of the present invention do not limit the position of the above friction fit, as long as the condition for applying or increasing the friction force received by the second driving unit during movement is satisfied. For example, the friction force can also be applied on both sides of the driving wheel <NUM> at the same time. The embodiment of the present invention neither limits the material of the position limited member <NUM>. For example, the position limited member <NUM> is an elastic member, a plastic member or a metal member.

Other embodiments of the present invention may increase the pressure of the driving arm <NUM> on the wheel teeth <NUM> instead of providing the above-mentioned friction fit, which can increase the maximum static friction of the driving wheel <NUM> and also ensure the non-rotating of the driving wheel <NUM> when the driving arm <NUM> slides on the surface of the wheel teeth <NUM>.

If the minimum dosage of infused drug driven by the driving unit is the minimum increment of the infusion device, the bilaterally driven drug infusion device with multiple infusion modes using the embodiment of the present invention can reduce the minimum increment of drug dosage and achieve more precise control of the drug infusion. When the patient needs to infuse more drugs, the large A<NUM>-B<NUM> mode can be selected to speed up the infusion rate. When a small amount of drug needs to be infused, the patient can select the small A<NUM>-B<NUM> mode to reduce the drug infusion rate and achieve precise control of the drug infusion.

Compared with the device with increment-unadjustable infusion, in the bilaterally driven drug infusion device with multiple infusion modes, the driving unit performs multiple-mode operation, making the infusion device have multiple infusion increments or infusion rates. With the bilaterally driven drug infusion device with multiple infusion modes of the embodiment of the invention, the patient can freely and flexibly switch between different increments of infusion according to the actual drug dosage and the demand of the infusion rate, thereby improving the infusion efficiency. At the same time, intermediate A<NUM>-B<NUM>-B<NUM> mode or B<NUM>-A<NUM>-A<NUM> mode and the small A<NUM>-B<NUM> mode are set along with the large A<NUM>-B<NUM> mode. And the bilaterally driven drug infusion device with multiple infusion modes can reduce the minimum dosage of infused drug in order to achieve the goal of precise control of the infusion.

As with the bilaterally driven drug infusion device with multiple infusion modes of the embodiment of the present invention, when the infusion is started, the amount of drug required is relatively large, and the patient can select the large A<NUM>-B<NUM> mode shown in <FIG> for infusion. After a period of infusion, the intermediate A<NUM>-B<NUM>-B<NUM> mode or B<NUM>-A<NUM>-A<NUM> mode can be used to reduce the rate of drug infusion. When the drug infusion is about to be completed, the patient can switch to the small A<NUM>-B<NUM> mode to further reduce the infusion rate and achieve precise control of the drug infusion. Of course, the patient can also choose one or several of the modes for infusion, and there are no specific restrictions.

in other embodiments of the present invention, when more than two driving arms are installed on one side of the driving unit, the infusion device can have more and more elaborate infusion modes, and the patient can further flexibly control the infusion to make the infusion process more precisely.

In summary, the present invention discloses a bilaterally driven drug infusion device with multiple infusion modes, in which the driving unit performs multiple-mode operations, thereby making the infusion device have multiple infusion increments or infusion rates, realizing increment-adjustable drug infusion, increasing the patient's flexibility in controlling the infusion process and improving the efficiency of drug infusion. At the same time, the bilaterally driven drug infusion device with multiple infusion modes also reduces the minimum dosage of infused drug, from which the patients can accurately control the drug infusion and precisely manage their own physiological condition.

Claim 1:
A bilaterally driven drug infusion device with multiple infusion modes, comprising:
a drug storage unit (<NUM>);
a piston (<NUM>) and a driving wheel (<NUM>) respectively connected with a screw (<NUM>), the driving wheel (<NUM>), provided with wheel teeth, drives the screw (<NUM>) movement by rotation, the piston (<NUM>) is arranged in the drug storage unit (<NUM>), the screw (<NUM>) advances the piston (<NUM>) to move;
a driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) cooperating with the driving wheel (<NUM>);
a power unit (<NUM>, <NUM>), connected to the driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>), outputs forces in two different directions on the driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) to lead driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) to perform multiple-mode operation, making the infusion device have multiple infusion increments or infusion rates; and
a pivot shaft (<NUM>, <NUM>), wherein the driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) includes driving arms (<NUM>, 110a-d, 410a-d, <NUM>, 510a-f, 610a-b), the driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) pivots around the pivot shaft (<NUM>, <NUM>) to drive driving arms (<NUM>, 110a-d, 410a-d, <NUM>, 510a-f, 610a-b) to move, and the driving wheel (<NUM>) includes at least two sub-wheels, and the driving arm (<NUM>, 110a-d, 410a-d, <NUM>, 510a-f, 610a-b) rotates the driving wheel (<NUM>) by engaging the wheel teeth,
characterized in that,
two driving arms (<NUM>, 110a-d, 410a-d, <NUM>, 510a-f, 610a-b) are installed on each side of the driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>), and two driving arms (<NUM>, 110a-d, 410a-d, <NUM>, 510a-f, 610a-b) on one side of the driving unit (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) are installed up and down, or are installed left and right.