CN113117184A

CN113117184A - Unilateral driving patch type drug infusion device

Info

Publication number: CN113117184A
Application number: CN202010935505.2A
Authority: CN
Inventors: 杨翠军
Original assignee: Medtrum Technologies Inc
Current assignee: Medtrum Technologies Inc
Priority date: 2019-12-31
Filing date: 2020-09-08
Publication date: 2021-07-16
Anticipated expiration: 2040-09-08
Also published as: CN113117184B

Abstract

The invention discloses a single-side drive patch type drug infusion device, which comprises: an infusion unit comprising: a medicine storage unit; the driving wheel drives the screw rod to move by rotating so as to push the piston arranged in the medicine storage unit to advance; the driving unit is matched with the driving wheel to operate and comprises at least one driving part; the power unit and the reset unit are connected with the driving unit; the infusion unit is arranged in the shell; the infusion needle structure comprises a base and an infusion needle fixedly arranged on the base, wherein the base comprises an initial position, a working position and an intermediate position between the initial position and the working position; and a first engaging portion. The infusion driving force of the infusion device is stable and controllable, and insulin blockage is not easy to occur.

Description

Unilateral driving patch type drug infusion device

Technical Field

The invention mainly relates to the field of medical instruments, in particular to a single-side driving patch type drug infusion device.

Background

The drug infusion device is a medical apparatus device which achieves the purpose of treating diseases by continuously injecting drugs into a patient. Drug infusion devices are widely used in the treatment of diabetes by continuously infusing insulin under the skin of a patient in a dose required by a human body to simulate the secretory function of the pancreas, thereby maintaining the blood sugar of the patient stable. Drug fluids are typically stored within infusion pump bodies, and existing drug infusion devices typically attach the pump body directly to the patient's body via a medical adhesive patch, and the patient operates a remote device for infusion.

At present, the existing drug infusion device has insufficient driving force, drugs cannot be infused into the body in time, air enters the subcutaneous space, the body health of a user is affected, and potential safety hazards exist.

Therefore, there is a need in the art for a single-side driven patch-type drug infusion device with a large infusion driving force and capable of preventing air from entering the body.

Disclosure of Invention

The embodiment of the invention discloses a single-side drive patch type drug infusion device.A power unit outputs controllable large driving force to drive a driving part to advance so as to push driving gear teeth to advance, and the infusion device is not easy to generate drug blockage; simultaneously, when the infusion needle structure was located the intermediate position, the medicine can be with the air escape in the infusion needle, avoids the air admission subcutaneous, eliminates the potential safety hazard, improves user experience.

The invention discloses a single-side drive patch type drug infusion device, which comprises: an infusion unit comprising: the medicine storage unit comprises an opening for medicine circulation; the driving wheel drives the screw rod to move by rotating so as to push the piston arranged in the medicine storage unit to advance; the driving unit is matched with the driving wheel to operate and comprises at least one driving part; a power unit and a reset unit connected with the drive unit, wherein: when the power unit applies force to the driving unit, the driving unit rotates around the rotating shaft, the driving part pushes the gear teeth, and the driving wheel rotates; when the reset unit independently exerts force on the driving unit, the driving part performs reset motion, the driving part stops pushing the gear teeth, and the driving wheel stops rotating; the infusion unit is arranged in the shell, a cavity comprising a first outlet and a second outlet is arranged in the shell, the opening is communicated with the first outlet in a sealing mode, and the second outlet is sealed by an elastic sealing piece; the infusion needle structure comprises a base and an infusion needle fixedly arranged on the base, wherein the base comprises an initial position, a working position and an intermediate position between the initial position and the working position; and the first clamping part and the base are clamped with each other to limit the position of the base.

According to one aspect of the invention, the drive unit comprises two drive portions which alternately push the gear teeth under the cooperation of the power unit and the reset unit.

According to one aspect of the invention, the two drive parts alternately push the teeth of the same drive wheel.

According to one aspect of the invention, the driving wheel comprises two sub-wheels provided with gear teeth, and the two driving parts alternately push the gear teeth on the different sub-wheels respectively.

According to one aspect of the invention, the power unit and the reset unit are linear drives.

According to one aspect of the invention, the linear actuator comprises a shape memory alloy.

According to an aspect of the present invention, the reset unit includes at least a spring, a resilient plate, a resilient bar, or a resilient reset rubber.

According to an aspect of the invention, the driving unit includes a driving portion, and the returning unit is a spring.

According to an aspect of the invention, the type of the first engaging portion includes one or more of a hook, a hole, a block, and a groove.

According to one aspect of the invention, the device further comprises a resilient member, the resilient member being disposed on the base or on the housing, the resilient member being compressed when the base is in the operative position.

According to one aspect of the invention, the device further comprises an auxiliary rebounding member for releasing the clamped base, wherein the base returns to the middle position or the initial position from the working position under the rebounding force of the elastic member.

According to one aspect of the invention, the base includes a guide post on which the base is snapped.

According to one aspect of the invention, the elastic member is a spring disposed on the housing, and a portion of the guide post is located in a hollow cavity of the spring.

According to one aspect of the present invention, the first engaging portion is provided on the housing.

According to one aspect of the invention, the clamping device further comprises a limiting component, and the first clamping part is arranged on the limiting component.

According to one aspect of the invention, the limiting component is provided with a sliding block, the shell is provided with a groove, the sliding block is arranged in the groove, and the sliding block slides along the groove so as to enable the limiting component to clamp and limit the base.

According to one aspect of the present invention, the stopper member is provided with an engaging arm, and the first engaging portion is provided on the engaging arm.

According to one aspect of the present invention, the housing is provided with a second engaging portion, the first engaging portion is configured to engage the base at the initial position or the intermediate position, and the second engaging portion is configured to engage the base at the operating position.

According to one aspect of the invention, an infusion needle comprises a front end and a subcutaneous lower end, both extending out of a base, wherein: when the base is located at the initial position, the front end of the infusion needle is not communicated with the second outlet; when the base reaches the intermediate or working position, the front end of the infusion needle pierces the elastic sealing member to communicate with the second outlet, and the medicine flows from the medicine storage unit to the subcutaneous end of the infusion needle along the cavity and the infusion needle.

Compared with the prior art, the technical scheme of the invention has the following advantages:

in the unilateral driving patch type drug infusion device disclosed by the invention, at least one driving unit is matched with a driving wheel to operate, and the driving unit comprises at least one driving part; a power unit and a reset unit connected with the drive unit, wherein: when the power unit applies force to the driving unit, the driving unit rotates around the rotating shaft, the driving part pushes the gear teeth, and the driving wheel rotates; when the reset unit applies force to the driving unit independently, the driving part performs reset motion, the driving part stops pushing the gear teeth, and the driving wheel stops rotating. The power unit can provide enough big and stable drive power, and then makes the infusion device possess enough big and stable controllable infusion pressure, avoids the medicine to block up, eliminates the potential safety hazard. Meanwhile, the infusion needle structure comprises a base and an infusion needle fixedly arranged on the base, and the base comprises an initial position, a working position and an intermediate position between the initial position and the working position. The middle position is arranged between the initial position and the working position, and the air is completely discharged by the medicine before the lower end of the infusion needle skin enters the subcutaneous part, so that the air is prevented from entering the subcutaneous part, and the potential safety hazard is eliminated.

Further, the driving unit comprises two driving parts, and under the cooperation of the power unit and the reset unit, the two driving parts can alternately push the gear teeth. The two driving parts alternately push the gear teeth to improve the infusion efficiency, and meanwhile, the infusion device can be provided with multiple infusion modes.

Further, the power unit and the reset unit are linear drivers. The power of the linear driver can be controlled by current, and when the current is constant, the power output by the linear driver is constant. Therefore, the linear driver can output stable and controllable power, so that the drug infusion is smoothly performed.

Furthermore, the reset unit comprises a spring, an elastic sheet, an elastic plate, an elastic rod or elastic reset rubber. When the reset unit is an elastic structural member, the reset unit can work without consuming extra energy, so that the power consumption of the infusion device is reduced, and the production cost is saved.

Further, the infusion device further comprises a resilient member disposed on the base or on the housing, the resilient member being compressed when the base is in the operating position. Before tearing off the infusion device, the elastic component can be with infusion needle skin lower extreme withdrawal casing in, avoid the fish tail skin, improve user experience.

Drawings

FIG. 1 is a schematic diagram of the internal major structure of an infusion unit in accordance with one embodiment of the present invention;

2 a-2 c are schematic top views of driving parts for driving the gear teeth according to various embodiments of the present invention;

FIGS. 3 a-3 c are schematic structural views of a power unit and a reset unit respectively cooperating with a driving unit according to various embodiments of the present invention;

4 a-4 b are schematic views illustrating a structure that a tension direction of a power unit is not parallel to a forward direction of a screw according to another embodiment of the present invention, and FIG. 4b is a top view of FIG. 4 a;

FIG. 5 is a schematic diagram of an infusion unit including two drive units in accordance with an embodiment of the present invention;

fig. 6 is a schematic view of an infusion unit comprising two drive units according to another embodiment of the present invention;

fig. 7 a-7 b are schematic structural views of two driving parts of a driving unit respectively cooperating with two sub-wheels according to an embodiment of the present invention;

fig. 8 a-8 b are schematic views of two driving parts of a driving unit according to another embodiment of the present invention cooperating with a same driving wheel, and fig. 8b is a schematic perspective view of the driving unit in fig. 8 a;

FIG. 9a is a perspective view of a partial structure of a drug infusion device in accordance with an embodiment of the present invention;

FIG. 9b is a schematic view of an infusion needle configuration according to an embodiment of the present invention;

FIG. 9c is a schematic structural view of a drug storage unit and a cavity according to an embodiment of the present invention;

FIG. 10 is a schematic view of a spacing member separated from a housing according to an embodiment of the invention;

FIG. 11 is a schematic structural view of an infusion needle configuration in accordance with yet another embodiment of the present invention;

fig. 12 is a schematic structural view of a base in an operating position according to an embodiment of the present invention.

Detailed Description

As mentioned above, the existing infusion device is easy to cause drug blockage in the using process, the drug cannot be infused into the body in time, air enters into the subcutaneous part, the body health of a user is affected, and potential safety hazards exist.

The research finds that the reasons causing the problems are as follows: the driving force for infusing the medicine is the resilience of the elastic part, but the resilience is easy to change and has uncontrollable stability, and air exists in the infusion needle when the medicine is punctured into the subcutaneous tissue.

In order to solve the problem, the invention provides a single-side drive patch type drug infusion device, wherein a power unit outputs controllable driving force to drive a driving part to advance so as to push driving gear teeth to advance, the power is controllable, and the infusion device is not easy to cause drug blockage. Simultaneously, when the infusion needle structure was located the intermediate position, the medicine can be with the air escape in the infusion needle, avoids the air admission subcutaneous, eliminates the potential safety hazard, improves user experience.

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments should not be construed as limiting the scope of the present invention unless it is specifically stated otherwise.

Further, it should be understood that the dimensions of the various elements shown in the figures are not necessarily drawn to scale, for example, the thickness, width, length or distance of some elements may be exaggerated relative to other structures for ease of illustration.

The following description of the exemplary embodiment(s) is merely illustrative and is not intended to limit the invention, its application, or uses in any way. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail herein, but are intended to be part of the specification as applicable.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one figure, further discussion thereof will not be required in the subsequent figure description.

Fig. 1 is a schematic view of the main structure inside an infusion unit according to an embodiment of the present invention.

The infusion unit of the infusion device mainly comprises a drug storage unit 1110, a piston 1120, a screw 1130, a driving wheel 1140, at least one driving unit 1150, a rotating shaft 1160, a resetting unit 1170, a power unit 1180 and an infusion needle. The infusion needle will be described in detail below. In an embodiment of the present invention, the driving unit 1150 is connected to the reset unit 1170 and the power unit 1180, respectively (herein, the connection includes a mechanical connection or an electrical connection).

The drug storage unit 1110 is used to store a drug. Drugs include, but are not limited to, insulin, glucagon, antibiotics, nutritional solutions, analgesics, morphine, anticoagulants, gene therapy drugs, cardiovascular drugs, or chemotherapeutic drugs, and the like. In particular, in embodiments of the invention, the drug is insulin.

The piston 1120 is used to infuse a drug into the body.

The screw 1130 is connected to the piston 1120 and the drive wheel 1140, respectively. In the present embodiment, the driving wheel 1140 drives the screw 1130 to advance in a screw manner by rotating, and further pushes the piston 1120 disposed in the drug storage unit 1110 to move forward, so as to achieve the purpose of drug infusion.

The circumferential surface of the driving wheel 1140 is provided with gear teeth 1141. The gear teeth 1141 are gear teeth or ratchet teeth. Specifically, in the present embodiment, the gear teeth 1141 are ratchet teeth. The ratchet teeth can be pushed more easily, and the driving efficiency is higher.

The driving unit 1150 includes at least one driving part 1151 for pushing the gear teeth 1141, thereby pushing the driving wheel 1140 to rotate. The driving unit 1150 is movably connected to the shaft 1160. In the embodiment of the present invention, the driving unit 1150 includes one driving part 1151.

The reset unit 1170 and the power unit 1180 are controlled by the program module and cooperate to cause the drive unit 1150 to rotate back and forth about the axis of rotation 1160, as shown in the direction R in fig. 1, and to cause the drive 1151 to move in the forward and reset directions. The drive unit 1150 performs one reciprocating rotation, and the drive wheel 1140 drives the screw 1130 one step forward, thereby pushing the piston 1120 to complete one drug infusion.

It should be noted that the forward direction of the driving portion 1151 refers to the direction of pushing the gear teeth 1141. The reset direction of the driving portion 1151 is opposite to the advance direction. At the time of reset, the driving portion 1151 slides only on the surface of the gear teeth 1141, and pushing is not performed.

In some embodiments of the present invention, the resetting unit 1170 includes at least one elastic member such as a spring, a spring plate, an elastic rod, and an elastic resetting rubber. Preferably, the restoring unit 1170 is a spring. Here, the spring includes a compression spring, an extension spring, a torsion spring, or the like. Specifically, in the embodiment of the present invention, the returning unit 1170 is a torsion spring. The torsion spring is more favorable for the reset rotation of the driving unit 1150. When the resetting unit 1170 is an elastic structure, the resetting unit can work without consuming extra energy, so that the power consumption of the infusion unit is reduced, and the production cost is saved.

In other embodiments of the present invention, the reset unit 1170 further comprises a linear driver, such as an electrically driven linear driver, such as a shape memory alloy, or an electrically heated linear driver. After the power is switched on, the physical form of the linear driver such as the shape memory alloy is changed, the shape memory alloy is contracted and deformed, and the power is output. The greater the current, the greater the amount of shrinkage deformation of the shape memory alloy, and the greater the dynamic force. Obviously, when the current is constant, the deformation quantity of the shape memory alloy is constant, and the output power is also constant. Therefore, the linear actuator such as the shape memory alloy can output stable and controllable power.

The embodiment of the present invention does not specifically limit the type, material selection, and position of the reset unit 1170 as long as the condition for rotating the driving unit 1150 in the reset direction can be satisfied.

The power unit 1180 is an electrically driven type linear driver or an electrically heated type linear driver. The power unit 1180 outputs or stops outputting power by alternately turning on and off the power. Specifically, in the present embodiment, the power unit 1180 is a shape memory alloy.

Fig. 2 a-2 c are schematic top views of the driving part 1151 pushing the gear teeth 1141 according to different embodiments of the present invention. Fig. 3 a-3 c are schematic structural diagrams illustrating the cooperation of the power unit 1180, the reset unit 1170 and the driving unit 1150 respectively according to various embodiments of the present invention.

As shown in fig. 2a and 2b, the principle of the reciprocating rotation of the driving unit 1150 according to the embodiment of the present invention is as follows: when power unit 1180 is at F_PWhen the driving unit 1150 is pulled, the driving unit 1150 rotates counterclockwise around the shaft 1160 and drives the driving portion 1151 to push the gear teeth 1141 to advance, the driving wheel 1140 rotates in the advancing direction, and the screw 1130 is driven to move toward D_AThe direction is advanced. The resetting unit 1170 is an elastic structure member and generates gradually enhanced elastic force F_R. When the power unit 1180 stops providing power, the reset unit 1170 separately applies power to the driving unit 1150, and the driving unit 1150 is under the elastic force F_RIs rotated clockwise about the axis of rotation 1160. At this time, the driving portion 1151 stops pushing the gear teeth 1141, and slides on the surface of the gear teeth 1141, and the driving wheel 1140 stops rotating. The driving unit 1150 performs one reciprocating rotation.

In another embodiment of the present invention, as shown in fig. 2b, the resetting unit 1170 and the power unit 1180 are disposed on one side of the rotating shaft 1160. And the positional relationship and the connection relationship among the reset unit 1170, the driving unit 1150 and the power unit 1180 can be adjusted by those skilled in the art according to the conventional technical principle, and are not particularly limited as long as the above-mentioned rotation condition can be satisfied.

In yet another embodiment of the present invention, as shown in fig. 2c, the resetting unit 1170 comprises an electrically driven linear actuator or an electrically heated linear actuator, such as a shape memory alloy or the like. The principle of the driving portion 1151 pushing the gear teeth 1141 is consistent with the foregoing. However, when the driving unit 1150 stops automatically resetting after the driving unit 1151 stops advancing, the resetting unit 1170 is required to supply the resetting power F_B。F_PAnd F_BIn the opposite direction, the reset unit 1170 and the power unit 1180 cooperate to cause the driving unit 1150 to rotate back and forth.

Preferably, as shown in FIGS. 2 a-2 c, in an embodiment of the present invention, F_PDirection of (A) and (B)_R(or F)_B)、D_ADirection of (1)Are all parallel. The parallel design makes full use of the space and the structural relationship inside the infusion unit, so that the internal structure is more compact.

Obviously, F can be adjusted as required by the person skilled in the art_PAnd F_BThe direction may be any direction as long as the condition for reciprocating the driving unit 1150 can be satisfied, as shown in fig. 3a to 3 c.

In other embodiments of the present invention, F_PDirection of (A) and (B)_R(or F)_B) Direction of (D)_AMay be non-parallel, and is not particularly limited as long as the purpose of reciprocating the driving unit 1150 can be achieved.

Fig. 4a and 4b are schematic views illustrating the structure that the direction of the pulling force of the power unit 1180 is not parallel to the advancing direction of the screw 1130. Fig. 4b is a top view of fig. 4 a.

Power pack 1180 tension F_PAnd the forward direction D of the screw 1130_AAnd is vertical. The shaft 1160 and the reset unit 1170 are disposed on the base. As mentioned above, the reciprocal rotation of the driving unit 1150 in the R direction drives the driving portion 1151 to push the gear teeth 1141, so that the driving wheel 1140 rotates in the W direction, and the screw 1130 is driven in the D direction_AProceeding in the direction. The driving principle of the driving unit 1150 is the same as described above.

In an embodiment of the present invention, retaining walls 1171 and 1172 (shown in fig. 1 and 2 a) are also provided in the infusion unit to stop rotation of the drive unit 1150. The contact of the driving unit 1150 with the

retaining wall

1171 or 1172 triggers an electrical signal to make the program unit control the output of power from the power unit 1180. In another embodiment of the present invention, only the retaining wall 1171 or only the retaining wall 1172 may be provided, and the rotation end point of the driving unit 1150 on a certain side is controlled by the program unit. The position of the

retaining wall

1171 or 1172 is not particularly limited in the embodiment of the present invention as long as the condition for stopping the rotation of the driving unit 1150 is satisfied.

In another embodiment of the present invention, no retaining wall may be provided (as shown in fig. 2 b-4 b), and the rotation end point of the driving unit 1150 is completely controlled by the program module.

Fig. 5 and 6 are schematic diagrams showing the structure of an infusion unit comprising two driving units, each driving unit comprises only one driving part, according to different embodiments of the invention.

As shown in fig. 5, the driving unit 1250a is reciprocally rotated about the rotation shaft 1260 in the R direction by the power unit 1280a and the reset unit 1270 a. Also, the driving unit 1250b is reciprocally rotated about the rotation shaft 1260 in the R direction by the power unit 1280b and the reset unit 1270 b. In the embodiment of the present invention, the rotation of the two driving units do not interfere with each other, and the driving

units

1250a and 1250b can each independently implement the driving manner described above.

Preferably, in the embodiment of the present invention, the driving unit 1250a and the driving unit 1250b are rotated asynchronously. That is, when the driving part 1251a of the driving unit 1250a pushes the gear teeth 1241 to move, the driving part 1251b of the driving unit 1250b slides on the surface of the gear teeth 1241. When the driving unit 1251b slides to a certain position, the program unit controls the power unit 1280a to stop outputting power to the driving unit 1250a, and in turn controls the power unit 1280b to output power to the driving unit 1250 b. At this time, the driving unit 1250a is rotated in a clockwise direction by the reset unit 1270a, the driving part 1251a slides on the gear tooth surface, and the driving part 1251b pushes the gear tooth 1241. In turn, alternately pushes and the

drive units

1250a and 1250b complete the alternating pushing of the same drive wheel 1240. Two drives push the teeth of a cogwheel in turn can improve infusion efficiency, and make infusion unit possess multiple infusion mode simultaneously.

In an embodiment of the present invention, the

power units

1280a and 1280b pull force F_PAnd the elastic force F of the

reset units

1270a and 1270b_RAnd forward direction D of screw 1230_AAs shown in the figure. As previously described, the tensile force F_PAnd the forward direction D of the screw 1230_AParallel.

In the embodiment of the present invention, the types of the

reset units

1270a and 1270b may refer to the above, and are not described herein again.

As shown in fig. 6, the driving

portions

1351a and 1351b alternately push the gear teeth 1341, respectively, and the power outputs of the

power units

1380a and 1380b are controlled by a program unit.

It should be noted that, in the embodiment of the present invention, the power sheetTensile force F of element 1380a_P' and tensile force F of the power unit 1380b_P"in the opposite direction. Obviously, the reset power F of the reset unit 1370a_R' and reset power F of reset unit 1370b_RThe direction of "is also opposite.

The

drive units

1350a and 1350b rotate asynchronously. That is, when the driving part 1351a of the driving unit 1350a pushes the cog 1341 to advance, the driving part 1351b of the driving unit 1350b slides on the surface of the cog 1341. When the driving part 1351b slides to a certain position, the program unit controls the power unit 1380a to stop outputting power to the driving unit 1350a, and then controls the power unit 1380b to output power to the driving unit 1350b, the driving unit 1350a is reset and rotated in a clockwise direction by the reset unit 1370a, the driving part 1351a slides on the surface of the gear tooth 1341, and the driving part 1351b pushes the gear tooth 1341. In turn, the

drive units

1350a and 1350b perform an alternating motion on the drive wheel 1340.

Likewise, each of the

drive units

1350a and 1350b may independently implement the above-described drive scheme. The types of the reset units 1370a and 1370b may be referred to above and are not described herein again.

It should be noted that in other embodiments of the present invention, the infusion unit may further include more driving units, each driving unit may further include more driving portions, or the driving wheel may include a plurality of sub-wheels, and different driving units respectively push the corresponding sub-wheels to rotate.

Fig. 7a and 7b are schematic structural views of the driving unit 1450 according to an embodiment of the present invention, in which two driving

parts

1451a and 1451b are respectively engaged with two sub-wheels 1440a and 1440 b. FIG. 7b is a right side view of a portion of the tooth structure of the sub-wheels 1440a and 1440b of FIG. 7 a.

As shown in fig. 7a and 7b, in the embodiment of the present invention, the driving unit 1450 includes two driving

parts

1451a and 1451b provided left and right. The drive wheel includes two laterally disposed and fixedly coupled sub-wheels 1440a and 1440b (i.e., the two sub-wheels can advance in unison). The driving

parts

1451a and 1451b may rotate the sub-wheels 1440a and 1440b, respectively. The shaft 1460 is disposed on the same side of the two sub-wheels 1440a and 1440 b. In the embodiment of the present invention, the power unit 1480 and the reset unit 1470 are both made of shape memory alloy, and the driving

portion

1451a or 1451b can push the

gear teeth

1441a or 1441b to move forward, and the working principle and the operation manner thereof are the same as those of the above description, and are not repeated herein.

In addition to each driving

part

1451a or 1451b performing pushing individually, the embodiment of the present invention can make the two driving

parts

1451a and 1451b operate cooperatively by adjusting the distance between the front ends of the driving

parts

1451a and 1451b or adjusting the degree of staggering of the

gear teeth

1441a and 1441 b. Preferably, in the embodiment of the present invention, the

gear teeth

1441a and 1441b are staggered with a degree t, as shown in fig. 7a and 7 b.

Obviously, in the embodiment of the present invention, the two driving

parts

1451a and 1451b reciprocate in synchronization. As shown in fig. 7a, after the previous forward movement is finished, the driving unit 1450 starts the reset rotation, the driving unit 1451a reaches the driving position before the driving unit 1451b, and the driving unit 1450 starts the next forward movement by using the driving unit 1451a instead. Or the drive unit 1450 may continue to reset rotation until the drive 1451b reaches the next drive position to begin the next forward motion.

Fig. 8a and 8b are schematic views illustrating a driving unit 1550 according to another embodiment of the present invention, which includes two driving

parts

1551a and 1551b disposed up and down, and the driving

parts

1551a and 1551b are engaged with a driving wheel 1540. Fig. 8b is a perspective view of the driving unit 1550 of fig. 8 a.

As shown in fig. 8a and 8b, the driving unit 1550 includes two driving

parts

1551a and 1551b disposed up and down and engaged with the same driving wheel 1540, and the driving

parts

1551a and 1551b reciprocate in synchronization. The front ends of the

drivers

1551a and 1551b are not flush, e.g., are a distance m, such that they cannot simultaneously push the teeth 1541 forward, as shown in fig. 8 a. After the driving part 1551b finishes the previous forward movement, the driving unit 1550 performs the reset rotation, the driving part 1551a reaches the next driving position before the driving part 1551b, and the driving unit 1550 may use the driving part 1551a to push the gear teeth 1541 to move forward to start the next forward movement. Or the driving unit 1550 continues to reset and rotate until the driving portion 1551b reaches the next driving position, and the next forward movement is started.

In other embodiments of the present invention, the driving unit may further include more driving portions, such as 3, 4 or more, which is not particularly limited herein.

Fig. 9a is a perspective view of a portion of a drug infusion device in accordance with an embodiment of the present invention. Fig. 9b is a schematic view of an infusion needle configuration according to an embodiment of the present invention. Fig. 9c is a schematic structural view of the drug storage unit 1110 and the cavity 30 according to the embodiment of the invention.

As shown in fig. 9a, the infusion device of the present embodiment includes a housing 100. The infusion unit is disposed within the housing 100. The infusion needle structure is disposed on the housing 100. The infusion needle structure is used to fixedly position the infusion needle 130 such that the drug flows subcutaneously.

As shown in fig. 9b, the infusion needle structure includes an infusion needle 130 and a base 120. The infusion needle 130 is fixedly disposed on the base 120. The infusion needle 130 includes a leading end 130a and a subcutaneous end 130 b. The leading end 130a and the subcutaneous end 130b both extend beyond the base 120. The front end 130a is adapted to communicate with the opening 20 of the drug storage unit 1110. The subcutaneous end 130b is used to penetrate the skin.

As shown in fig. 9c, the housing 100 is further provided with a cavity 30 comprising a first outlet 31 and a second outlet 32. The first outlet 31 is in sealed communication with the opening 20 of the drug storage unit 1110. Here, the sealed communication means that the cavity 30 and the medicine storage unit 1110 communicate with the first outlet 31 through the opening 20, and the medicine flows therethrough without leakage. The second outlet 32 is sealed by an elastomeric seal 40. When the front end 130a of the infusion needle pierces the elastic sealing member 40, the infusion needle 130, the cavity 30, the opening 20 and the drug storage unit 1110 communicate with each other, and the drug can enter the infusion needle 130 from the drug storage unit 1110 and reach the subcutaneous end 130b or be infused into the subcutaneous part, as shown in fig. 9 c.

With continued reference to fig. 9a and 9b, in an embodiment of the present invention, the base 120 has three positions on the infusion device: an initial position, an intermediate position and a working position. Wherein the intermediate position is between the initial position and the working position. Since the infusion needle 130 is fixed to the base 120, in the embodiment of the present invention, the structure equivalent to the infusion needle also has the above-described three positions.

Specifically, in the present embodiment, when the base 120 is in the initial position, the infusion needle forward end 130a does not pierce the resilient seal 40, and the infusion needle forward end 130a does not communicate with the second outlet 32. When the base 120 reaches the intermediate or working position, the infusion needle forward end 130a pierces the resilient seal 40 to communicate with the second outlet 32. At this time, along the cavity 30 and the needle 130, the drug flows from the drug storage unit 1110 to the hypodermic lower end 130 b.

It will be apparent that initially, with the base 120 in the initial position, the infusion needle 130 is not in communication with the drug storage unit 1110, and therefore, the infusion needle 130 is filled with air. When leaving the factory, the infusion needle 130 is not communicated with the drug storage unit 1110, so that the flexibility of setting the structural position of the infusion needle can be improved, and the structural design of an infusion device is optimized.

After the base 120 is moved to the intermediate position, the infusion needle forward end 130a pierces the elastomeric seal 40, thereby placing the infusion needle 130 in communication with the drug storage unit 1110. At this point, when the infusion unit is activated, the drug may travel along the infusion needle 130 to the subcutaneous end 130b of the infusion needle, thereby expelling air from the infusion needle 130. Thereafter, when the base 120 reaches the working position, the subcutaneous end 130b pierces the skin to deliver the drug into the body. Because the air in the infusion needle 130 is exhausted by the medicine when the base 120 is located at the middle position, the air cannot be infused into the body after the base 120 reaches the working position, and the potential safety hazard is eliminated.

In order to ensure that the infusion needle arrangement is in different positions, a first catch 140 is also provided in the infusion device of the present invention. The first engaging portion 140 is used to engage and limit the base 120 to the different positions. The type of the first engaging portion 140 includes one or more of a hook, a hole, a block, and a groove. Specifically, in the embodiment of the present invention, the first engaging portion 140 is a hook.

Referring to fig. 9b, in the embodiment of the invention, the base 120 includes a guide post 121. The position where the base 120 is engaged by the first engaging portion 140 is located on the guide post 121, such as when engaging at a, the base 120 is located at the initial position, and when engaging at B, the base 120 is located at the middle position.

With continued reference to fig. 9a, in an embodiment of the present invention, the infusion device further includes a stop feature 110. Since the stopper member 110 is used to regulate the position of the base 120, the first engaging portion 140 is provided on the stopper member 110. Specifically, in the embodiment of the present invention, the limiting member 110 is provided with a snap arm 112. The first engaging portion 140 is disposed on the engaging arm 112.

When the base 120 is at the initial position, the first engaging portion 140 is engaged with the position a of the guide post 121. The top of the base 120 is directly pressed by a finger, and the first engaging portion 140 engages the guide post 121 at the B position, so that the base 120 reaches the intermediate position.

The base 120 may be provided with a structure that can be engaged with each other on the side walls thereof without providing the guide posts 121, and the structure is not particularly limited as long as the base 120 can be engaged at different positions.

Specifically, in the present embodiment, the base 120 can be only snapped to the initial position and the intermediate position using the stopper member 110. And the base 120 cannot reach the working position due to the blocking of the limiting part 110. Meanwhile, the housing 100 is provided with a second engaging portion 150. The second engaging portion 150 is used for engaging the C position of the base 120 to engage the base 120 at the working position.

Fig. 10 is a schematic structural view illustrating the spacing member 110 separated from the housing 100 according to the embodiment of the invention.

The stopper part 110 of the embodiment of the present invention includes a slider 111. The housing 100 is provided with a groove 101, and the slider 111 is disposed in the groove 101. The stopper member 110 can slide along the groove 101, and further, can stop or release the engagement of the base 120. Specifically, in the embodiment of the present invention, after the sliding limiting member 110 releases the clamping limitation on the base 120, the limiting member 110 can be removed from the housing 100, as shown in fig. 12.

Thus, the principle of operation of the embodiment of the present invention in which the base 120 reaches three positions is as follows: at the initial moment, the infusion device is not attached to the skin surface, the first engaging portion 140 is engaged with the position A of the guide post 121, and the base 120 is at the initial position. At this time, the infusion needle leading end 130a does not pierce the elastic seal 40, and the infusion needle 130 is not in communication with the drug storage unit 1110. Then, the top of the base 120 is directly pressed by the finger, the first engaging portion 140 is engaged with the position B of the guide post 121, the base 120 is at the middle position, and the infusion device is still not attached to the skin surface. The infusion needle forward end 130a pierces the resilient seal 40, the infusion needle 130 communicates with the drug reservoir unit 1110, and drug can enter the infusion needle 130 and expel air from the infusion needle 130. The infusion needle lower end 130b does not extend out of the housing 100 or slightly extends out of the housing 100. The infusion device is then adhered to the skin surface. And the stopper 110 is slid backward, and the first engaging portion 140 is disengaged from the position B to release the engagement with the base 120. Continued depression of the top of the base 120 causes the second catch 150 to catch in the C position of the base 120, the base 120 is in the operative position and the subcutaneous lower end 130b of the infusion needle penetrates into the skin. As is apparent, the infusion needle 130 communicates with the drug storage unit 1110 and the drug may be infused subcutaneously.

Fig. 11 is a schematic structural view of an infusion needle structure according to another embodiment of the present invention.

In another embodiment of the invention, the infusion device is not provided with the stop member 110 and the second catch 150, but the first catch (not shown at this time) is provided directly on the housing 100. At this time, the initial position a, the intermediate position B and the working position C are all on the guide post, as shown in fig. 11. When the base 120 is at the initial position, the first engaging portion is engaged at the position a. When the top of the base 120 is pressed, the base 120 moves downward, the first engaging portion is engaged with the position B, and the base 120 is located at the middle position. The top of the base 120 is continuously pressed, the base 120 continues to move downwards, the first clamping portion is clamped at the position C, and the base 120 is located at the working position. This design reduces the number of structures in the infusion device, facilitating user operation.

Fig. 12 is a schematic structural diagram of the base 120 in the working position according to the embodiment of the present invention.

Also included in the infusion set is a resilient member 160 disposed on the base 120 or the housing 100. Specifically, in the embodiment of the present invention, the elastic member 160 is a spring disposed on the housing 100, and a portion of the guide post 121 is located in a hollow cavity of the spring (as shown in fig. 9 b). When the base 120 is located at the working position, the elastic member 160 is compressed, thereby generating a resilient force.

In other embodiments of the present invention, the elastic member 160 may also be an elastic silicone rubber, an elastic sheet, and the like, and herein, is not limited specifically. As in one embodiment of the present invention, the elastic member 160 is disposed on the base 120, and the elastic member 160 generates a resilient force after interacting with the housing 100.

As previously described, the hypodermic lower end 130b of the infusion needle pierces the skin when the base 120 is in the operative position. The infusion device needs to be replaced after the drug is exhausted. If the hypodermic needle 130b is not retracted into the infusion device when the infusion device adhered to the skin surface is torn off, the skin is easily scratched by the tip of the hypodermic needle 130b, causing additional trauma and a poor user experience. Therefore, after the elastic member 160 is provided, the infusion needle skin lower end 130b can be retracted into the housing 100 before the infusion device is torn off, so as to avoid scratching the skin and improve the user experience.

In particular, in an embodiment of the invention, the infusion device further comprises an auxiliary resilient member 113 (as shown in fig. 9a and 10). The auxiliary resilient member 113 is used to release the engaged base 120. After the engaged base 120 is released, the base 120 returns to the neutral position or the initial position by the spring-back force.

Embodiments of the present invention do not limit the type of the auxiliary resilient member 113 and the manner and location of releasing the engaged base 120. As in the present embodiment, the auxiliary resilient member 113 is provided at one end of the stopper member 110. The auxiliary resilient member 113 may be inserted into the housing 100 to change the position of the second catching portion 150, thereby releasing the base 120. In another embodiment of the present invention, the auxiliary resilient member 113 can enter the interior of the housing 100 through a hole (not shown) provided on the top of the base 120, thereby changing the position of the second engaging portion and releasing the base 120. In another embodiment of the present invention, an additional sliding button may be further provided, and the sliding button is connected to the second engaging portion. The user slides the slide button with a finger to release the engagement with the base 120.

It should be noted that in other embodiments of the present invention, the manner of the base 120 reaching different positions can also be automatically controlled by a program, and does not need to be manually operated by a user with a finger, and is not limited in particular.

In summary, the invention provides a single-side driving patch type drug infusion device, wherein a power unit outputs controllable driving force to drive a driving part to advance, so as to push driving gear teeth to advance, the power is controllable, and the infusion device is not easy to cause drug blockage. Simultaneously, when the infusion needle structure was located the intermediate position, the medicine can be with the air escape in the infusion needle, avoids the air admission subcutaneous, eliminates the potential safety hazard, improves user experience.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A single-side drive patch type drug infusion device, comprising:

an infusion unit comprising:

a drug storage unit comprising an opening for the passage of a drug;

the driving wheel drives the screw rod to move through rotation so as to push the piston arranged in the medicine storage unit to advance;

at least one driving unit matched with the driving wheel to operate, wherein the driving unit comprises at least one driving part;

a power unit and a reset unit connected with the drive unit, wherein:

when the power unit applies force to the driving unit, the driving unit rotates around a rotating shaft, the driving part pushes the gear teeth, and the driving wheel rotates;

when the reset unit independently applies force to the driving unit, the driving part performs reset motion, the driving part stops pushing the gear teeth, and the driving wheel stops rotating;

a housing, the infusion unit being disposed within the housing, a cavity comprising a first outlet and a second outlet being disposed within the housing, the opening being in sealed communication with the first outlet, the second outlet being sealed by an elastic seal;

an infusion needle structure comprising a base and an infusion needle fixedly disposed on the base, the base comprising an initial position, a working position, and an intermediate position between the initial position and the working position; and

the first clamping part and the base are clamped with each other to limit the position of the base.

2. The single-sided drive patch type drug infusion device of claim 1, wherein the drive unit comprises two drive portions, and the two drive portions can alternately push the gear teeth under the cooperative operation of the power unit and the reset unit.

3. The single-sided drive patch type drug delivery device of claim 2, wherein both of the drive portions alternately push the gear teeth on the same drive wheel.

4. The single-sided drive patch type drug infusion device of claim 2, wherein the drive wheel comprises two sub-wheels provided with the gear teeth, and the two drive portions alternately push the gear teeth on the different sub-wheels, respectively.

5. The single-sided drive patch medication delivery device of claim 1, wherein the power unit and the reset unit are linear drivers.

6. The single-sided drive patch medication delivery device of claim 5, wherein the linear drive comprises a shape memory alloy.

7. The single-sided drive patch type drug infusion device of claim 1, wherein the reset unit comprises at least a spring, a spring plate, an elastic rod or an elastic reset rubber.

8. The single-sided drive patch type drug infusion device of claim 7, wherein the drive unit comprises a drive portion and the return unit is a spring.

9. The single-sided drive patch type drug infusion device of claim 1, wherein the type of the first engaging portion comprises one or more of a hook, a snap hole, a snap block, and a snap groove.

10. The single-sided drive patch medication delivery device of claim 9, further comprising a resilient member disposed on the base or housing, the resilient member being compressed when the base is in the operational position.

11. The single-edge driven patch type drug infusion device of claim 10, further comprising an auxiliary resilient member for releasing the base being snapped, wherein the base returns from the working position to the intermediate position or the initial position under the resilient force of the elastic member.

12. The single-sided drive patch type drug infusion device of claim 11, wherein the base includes a guide post, the location on the guide post where the base is snapped into place.

13. The single-sided drive patch type drug infusion device of claim 12, wherein the resilient member is a spring disposed on the housing, and a portion of the guide post is located within a hollow cavity of the spring.

14. The single-sided drive patch medication delivery device of claim 13, wherein the first snap-fit portion is disposed on the housing.

15. The single-sided drive patch type drug infusion device of claim 13, further comprising a stop component, wherein the first snap-fit portion is disposed on the stop component.

16. The single-sided drive patch type drug infusion device of claim 15, wherein a slider is disposed on the position-limiting component, a groove is disposed on the housing, and the slider is disposed in the groove and slides along the groove to enable the position-limiting component to block and limit the base.

17. The single-sided drive patch type drug infusion device of claim 15, wherein the stop component is provided with a snap-fit arm, and the first snap-fit portion is provided on the snap-fit arm.

18. The single-sided drive patch type drug infusion device of claim 17, wherein the housing is provided with a second snap-fit portion, the first snap-fit portion being configured to snap-fit the base in the initial position or the intermediate position, and the second snap-fit portion being configured to snap-fit the base in the working position.

19. The single-sided drive patch medication delivery device of claim 1, wherein the infusion needle includes a leading end and a subcutaneous end, both of which extend out of the base, wherein:

when the base is located at the initial position, the front end of the infusion needle is not communicated with the second outlet;

when the base reaches the intermediate position or the working position, the front end of the infusion needle penetrates through the elastic piece to be communicated with the second outlet, and the medicine flows from the medicine storage unit to the subcutaneous end of the infusion needle along the cavity and the infusion needle.