CN107456625B - Fluid infusion apparatus and its drive system - Google Patents

Abstract

The invention discloses a fluid infusion device and its driving system. Wherein, the drive system includes: an active component; a drive mechanism, the drive mechanism is used to drive the active component to rotate; a driven component, the driven component is configured to cooperate with the active component so that the two can relative rotation while generating relative displacement, wherein one of the active member and the driven member is configured to push the fluid infusion set in response to the other of the active member and the driven member resistance to movement of the piston in a first direction, resulting in movement in a second direction opposite to the first direction; and a detection mechanism for detecting the movement of the driving member and the driven member Whether the movement of one of them along the second direction satisfies the set condition. Adopting related embodiments of the present invention is beneficial to accurately and timely determine the state of the fluid infusion device.

Description

Fluid infusion device and drive system thereof

technical field

The present invention relates to the field of fluid delivery, and more specifically, to a fluid infusion device and a driving system thereof.

Background technique

Diabetes is a metabolic disease characterized by high blood sugar. Hyperglycemia is generally due to defective insulin secretion or impaired biological action, or a combination of both. Long-term hyperglycemia in diabetic patients can lead to chronic damage and dysfunction of multiple body organs (eg, eyes, kidneys, heart, blood vessels, nervous system, etc.).

The clinical diagnosis of diabetes can be divided into type 1 diabetes and type 2 diabetes. Type 1 diabetes, also known as insulin-dependent diabetes, usually appears in childhood or adolescence, and is a disease that is inherited in families. Type 1 diabetes is an autoimmune disease in which the body's immune system attacks the beta cells in the body that produce insulin, eventually resulting in the body not being able to produce insulin. Such patients need to inject exogenous insulin to control the blood sugar level in the body. Patients with type 1 diabetes generally need to wear electronic insulin pumps for 24 hours, for example, Medtronic Minimed series insulin pumps. Type 2 diabetes, also known as non-insulin-dependent diabetes, generally affects adults, especially obese people, and its condition can lead to weight loss. Possible causes include: insulin resistance, which prevents the body from using insulin effectively; and decreased insulin production, which prevents the body from meeting its needs. Patients with early type 2 diabetes can control and even cure diabetes by improving lifestyle (for example, healthy diet, moderate exercise, safe weight loss, smoking cessation and avoiding second-hand smoke, etc.). Most patients with type 2 diabetes can take oral hypoglycemic drugs to help control blood sugar levels in the body or control blood sugar levels through phased injections of insulin.

Traditional drug infusion devices adopt a structure in which the motor and the lead screw are arranged coaxially. With this structure, in order to detect the working state of the fluid infusion (for example, whether it is blocked), the drive system including the motor and the lead screw needs to be designed to be movable, which increases the structural complexity of the drive system and the fluid infusion device , and the stability of operation and the accuracy of detection need to be improved.

Contents of the invention

In order to solve the defects existing in the existing fluid infusion device, the embodiment of the present invention provides a fluid infusion device and its drive system, which is beneficial to accurately and timely determine the status of the fluid infusion device.

In one aspect, an embodiment of the present invention provides a drive system for a fluid infusion device, including:

Active components;

a driving mechanism, the driving mechanism is used to drive the active member to rotate;

A driven member, the driven member is configured to cooperate with the active member so that the two can generate relative displacement while relative rotation, wherein one of the active member and the driven member is configured to: be able to In response to resistance to movement of the other of the driving member and the driven member in a first direction advancing a piston of the fluid infusion set, movement in a second direction is produced, the second direction being the same as the first direction. one direction reversed; and

A detection mechanism for detecting movement of one of the driving member and the driven member along the second direction.

Correspondingly, a fluid infusion device is provided according to an embodiment of the present invention, and the fluid infusion device includes:

a reservoir for containing fluid;

a fluid delivery mechanism in communication with the reservoir for delivering fluid to a subject;

a piston configured to move axially within the reservoir along the reservoir; and

A drive system as previously described for axially moving the piston within the reservoir to deliver fluid within the reservoir to a subject via the fluid delivery mechanism.

With various embodiments of the invention, movement in a second direction is produced by one of the driving member and the driven member in response to resistance to movement of the other of the driving member and driven member in the first direction, and By detecting the reverse movement through the detection mechanism, conditions such as blockage of the fluid infusion set and emptying of fluid can be found accurately and in time.

Description of drawings

Fig. 1 shows a schematic structural diagram of a drive system according to Embodiment 2 of the present invention;

Fig. 2 shows a schematic structural view of a driving system according to Embodiment 3 of the present invention and a partial enlarged view thereof;

Fig. 3 shows the A-A sectional view of the drive system shown in Fig. 2;

Fig. 4 shows a schematic structural diagram of a drive system according to Embodiment 4 of the present invention;

Fig. 5 shows a schematic structural diagram of a drive system according to Embodiment 5 of the present invention;

Fig. 6 shows a schematic diagram of the overall structure of a fluid infusion device according to Embodiment 7 of the present invention;

Fig. 7 shows a schematic structural diagram of a guiding mechanism.

Detailed ways

Various aspects of the present invention will be described in detail below with reference to the drawings and specific embodiments. Wherein, well-known structures, components and their mutual connections, linkages or operations are not shown or described in detail. Also, the described components, structures, or functions may be combined in any manner in one or more implementations. It should be understood by those skilled in the art that the various implementations described below are only for illustration, rather than limiting the protection scope of the present invention. It can also be easily understood that components, structures, units or steps in the various embodiments described herein and shown in the drawings can be combined and designed in various configurations. It can also be easily understood that although specific names, terms, ranges, etc. may be explained only in some embodiments, the explanations are also applicable to other embodiments unless otherwise specified.

【Example 1】

This embodiment provides a driving system, which can be applied to a fluid infusion device, for example, a patch pump for injecting medical fluid to a patient. Overall, the drive system includes a driving component, a driving mechanism, a driven component and a detection mechanism. Detailed description will be given below.

In this embodiment, the driven member is configured to cooperate with the driving member so that they can generate relative displacement while rotating relative to each other. For example, the driving member and the driven member are configured in a cooperative manner such as a ball screw or a threaded screw. And, one of the active member and the driven member is configured to generate an edge along Movement in a second direction, the second direction being opposite to the first direction. For example, the active member is configured to push the piston in a first direction, and the driven member is configured to move in a second direction in response to resistance to movement of the active member in the first direction. Alternatively, the driven member is configured to push the piston in a first direction and the active member is configured to move in a second direction in response to resistance to movement of the driven member in the first direction.

In this embodiment, the driving mechanism is used to drive the active component to rotate. For example, a drive mechanism includes a power source and a transmission device. The power source transmits the driving force to the active component through the transmission device, so that the active component rotates.

In this embodiment, the detection mechanism is used to detect the movement of said one of the driving member and the driven member (ie, the one of the driving member and the driven member moving in the second direction) along the second direction Conditions, for example, whether the movement satisfies set conditions. Optionally, the set condition may be related to the amount of movement, or may be related to a parameter that indirectly reflects the amount of movement.

With the driving mechanism provided by this embodiment, by configuring one of the active member and the driven member to be able to reversely move when the movement of the other is blocked, and detecting the reverse movement through the detection mechanism, it is possible to accurately and timely Conditions such as fluid infusion set blockage, fluid emptying, etc.

Optionally, in an implementation manner of this embodiment, the detection mechanism includes a pressure sensor. The pressure sensor is arranged at a position opposite to an end of the one of the driving member and the driven member that is far away from the piston, and is used for detecting that the one of the driving member and the driven member moves along the second The pressure generated by the movement in the direction. In addition, the detection mechanism may further include a processing circuit (for example, a processor) for judging whether the pressure reaches a threshold according to the detection result of the pressure sensor.

In another implementation manner equal to or similar to this implementation manner, the pressure sensor may integrate functions of the processing circuit. For example, the pressure sensor is a pressure switch, and when the pressure generated by the movement of the one of the driving member and the driven member along the second direction reaches a threshold value, a switch action is triggered.

Optionally, in an implementation manner of this embodiment, the detection mechanism includes a displacement sensor for detecting the displacement of the one of the active member and the driven member along the second direction, for example, detecting Whether to move to the set position. For example, the displacement sensor is a photoelectric sensor. With the description of the drive system in this embodiment or the embodiments described below, the structure and working principle of the drive system in this embodiment or the embodiments described below will become more clear. A skilled person can set the displacement sensor according to actual needs, therefore, the present invention does not limit the specific way of setting the displacement sensor.

Optionally, in an implementation manner of this embodiment, the drive system has a control mechanism in addition to the active component, the drive mechanism, the driven component and the detection mechanism. The control mechanism is used to determine the working state of the fluid infusion device according to the output result of the detection mechanism, and/or is used to control the driving mechanism according to the output result of the detection mechanism. For example, if the output result of the detection mechanism does not meet the set condition, the control mechanism determines that the fluid infusion device is working normally; otherwise, the control mechanism determines that the fluid infusion device is working abnormally (eg, blocked). For another example, when it is determined that the fluid infusion device is working abnormally, the driving mechanism is controlled to stop applying the driving force, and peripheral devices (such as indicator lights, buzzers, displays, etc.) are controlled to alarm. In addition, the control mechanism can also integrate the functions of the aforementioned processing circuit.

Optionally, in an implementation manner of this embodiment, the drive system further has an encoder, which is used to perform code control on a motor serving as a power source.

[Example 2]

Fig. 1 shows a schematic structural diagram of a driving system according to Embodiment 2 of the present invention. The drive system is applied in a fluid infusion device, for example, in an attached pump for injecting medical fluid to a patient. Overall, the fluid infusion device provided by Embodiment 2 includes a driving component, a driven component, a driving mechanism and a detecting mechanism.

In Embodiment 2, referring to FIG. 1 , the active component is a lead screw 1 , and the driven component is a nut 2 cooperating with the thread of the lead screw 1 for pushing the piston along the first direction a. A detailed description will be given below in conjunction with the accompanying drawings.

In this embodiment, referring to FIG. 1 , a lead screw 1 as a driving component cooperates with a nut 2 as a driven component, so that the two can generate relative displacement while rotating relative to each other. It should be noted that the nut 2 in this embodiment is only a schematic representation of the driven member, intended to illustrate the structure and working principle of the drive system. Those skilled in the art should understand that under the condition that the driven member and the active member can produce relative displacement while relative rotation, the shape of the driven member, the connection relationship between the driven member and the piston (for example, direct connection or indirect connection) to carry out flexible design, which all falls within the protection scope of the claims of the present invention. In addition, the lead screw 1 illustrated in each embodiment of the present invention is also a schematic representation, and each embodiment of the present invention does not specifically limit the thread distribution on the lead screw 1 .

In this embodiment, the lead screw 1 is configured to be able to generate movement in a second direction b in response to the blockage of the movement of the nut 2 in the first direction a of the push piston, said second direction b being the same as said first direction b. Direction a is reversed. Wherein, the guide structure for the nut 2 to push the piston will be described below.

In this embodiment, the driving mechanism 3 is used to drive the lead screw 1 to rotate, and the detection mechanism 4 is used to detect the movement of the lead screw 1 along the second direction b, for example, to detect whether the movement of the lead screw 1 satisfies a set condition.

In the driving system provided in this embodiment, the driving mechanism 3 drives the lead screw 1 to rotate, and the nut 2 is guided by the guiding mechanism mentioned below to move along the first direction a to push the piston. When the movement of the nut 2 along the first direction a is blocked, since the lead screw 1 is configured to be movable along the second direction b, the rotation of the lead screw 1 causes the lead screw 1 to The rod 1 moves along the second direction b relative to the nut 2, and then the detection mechanism 4 detects the movement of the lead screw 1 along the second direction b, for example, detects whether the movement of the lead screw 1 satisfies a set condition.

Therefore, by adopting the drive system provided in Embodiment 2, by making the lead screw 1 move in response to the obstruction of the nut 2, and detecting the movement of the lead screw 1 through the detection mechanism, it is possible to accurately and timely discover or determine the fluid infusion device status (for example, whether it is blocked).

[Example 3]

Fig. 2 shows a schematic structural view of a drive system according to Embodiment 3 of the present invention and its partial enlarged view, and Fig. 3 shows an A-A sectional view of the drive system shown in Fig. 2 (the power source is omitted). The drive system provided in Embodiment 3 is applied to a fluid infusion device, for example, to an attached pump for injecting medical fluid to a patient.

Overall, the fluid infusion device provided by Embodiment 3 includes a driving component, a driven component, a driving mechanism and a detecting mechanism.

In this embodiment, the same as or similar to Embodiment 2, the lead screw 1 is a driving component, and the nut 2 is a driven component. Wherein, the nut 2 is used to push the piston of the fluid infusion device to move along the first direction a, and the lead screw 1 is configured to: respond to the resistance of the movement of the nut 2 along the first direction a, to generate movement along the second direction b . The detection mechanism 4 is used to detect the movement of the lead screw 1 along the second direction b. For related descriptions, please refer to the description in Embodiment 2, and details are not repeated here.

In this embodiment, as shown in FIG. 2 , the driving mechanism 3 includes a power source 31 (for example, a motor) and a transmission gear 32 . Wherein, the final driven gear 321 of the transmission gear 32 is located at the end of the lead screw 1 away from the piston, and is used to rotate together with the lead screw 1 .

Optionally, in an implementation of this embodiment, as shown in the partial enlarged view in FIG. The moving gears 321 are all spur gears. In this way, both the final driving gear 322 and the final driven gear 321 can slide relative to each other, so that the lead screw 1 can move along the second direction b, even during the transmission of the driving force. In an example of this implementation, the length of the teeth of the final driving gear 322 is greater than the length of the teeth of the final driven gear 321 . In an example of this implementation, in order to allow the lead screw 1 to move along the second direction b, there is a space for the final driven gear 321 to move along the second direction b in the gearbox 5 accommodating the transmission gear 32 . For example, a gap is provided between the gear box 5 and the final driven gear 321 , and a space for the lead screw 1 to extend is provided at the end of the lead screw 1 away from the piston.

Optionally, in an implementation of this embodiment, the final driven gear 321 of the transmission gear 32 is connected to the lead screw 1 in a relatively slidable manner, for example, connecting the lead screw 1 to the final driven gear 321 set to a uniform flat shape. In other words, the final driven gear 321 and the lead screw 1 can both rotate together and slide relative to each other, so that the lead screw 1 can not only be rotated by the driving force, but also have the ability to move along the second direction b. Different from the foregoing implementations, the gear shape of the final driven gear 321 is not limited in this implementation.

In this embodiment, several structural configurations are exemplarily provided to make the lead screw 1 reversely move in response to the resistance of the movement of the nut 2 along the first direction a. The drive system with such a structural arrangement can respond to the blockage of the nut 2 along the first direction a to produce an action that can be detected by the detection mechanism 4, which facilitates accurate and timely detection of the state of the fluid infusion device.

Optionally, in an implementation of this embodiment, as shown in FIGS. 2 and 3 , the detection mechanism 4 is a pressure sensor, which is arranged at a position opposite to the end of the lead screw 1 away from the piston, for example, with Lead screw 1 remains in contact. The pressure sensor 4 is used to withstand the pressure generated by the movement of the lead screw 1 along the second direction b, and when the pressure reaches a threshold, output a signal indicating that the pressure reaches a threshold. In other implementation manners of this embodiment, displacement sensors may also be used instead of pressure sensors.

Optionally, in this implementation manner, the detection mechanism 4 can be fixed on, for example, a gear box or a specially provided base, and those skilled in the art can flexibly set it according to needs, which is not specifically limited in the present invention.

Optionally, in an implementation of this embodiment, the drive system may further include a control mechanism (not shown), configured to determine the working state of the fluid infusion device according to the output result of the detection mechanism 4, and/or, It is used to control the drive mechanism 3 according to the output result of the detection mechanism 4 .

Optionally, in an implementation manner of this embodiment, the power source 31 is a motor, and the output shaft of the motor is not coaxial with the lead screw 1 . For example, the output shaft of the motor and the lead screw 1 are vertically, horizontally misaligned, or at any desired angle. This implementation method provides a structural design suitable for flexible layout of the motor, transmission gear 32, lead screw 1, etc. according to the size of the fluid infusion device (for example, an attached pump). It is beneficial to reduce the size of the fluid infusion device and improve portability.

Optionally, in an implementation manner of this embodiment, the power source 31 is a motor, and the position of the motor is fixed. Compared with the prior art in which the motor needs to move together with the lead screw, this implementation method has the effects of simple structure and stable operation.

Optionally, in other implementations of this embodiment, the power source 31 is not limited to a motor. For example, those skilled in the art may use a shape memory alloy drive instead of a motor drive.

【Example 4】

Fig. 4 shows a schematic structural diagram of a drive system according to Embodiment 4 of the present invention, the drive system is applied to a fluid infusion device, for example, an attached pump for injecting medical fluid to a patient. Overall, the fluid infusion device provided by Embodiment 4 includes a driving component, a driven component, a driving mechanism and a detecting mechanism.

In this embodiment, different from Embodiment 2, as shown in FIG. 4 , the lead screw 1 is a driven member for pushing the piston along the first direction a, and the active member 2 ′ fits with the thread of the lead screw 1 . Detailed description will be given below.

In this embodiment, referring to FIG. 4 , the active component 2 ′ cooperates with the lead screw 1 as the driven component, so that the two can generate relative displacement while rotating relative to each other. Also, the active member 2' is configured to be able to generate movement in a second direction b opposite to the first direction a in response to the resistance of the lead screw 1 to movement in the first direction a of the pushing piston.

In this embodiment, the driving mechanism 3 is used to drive the active member 2' to rotate, and the detection mechanism is used to detect whether the movement of the active member 2' along the second direction b satisfies a set condition. In this embodiment, the detection mechanism is located inside the gear box 5, so it is not shown in the figure. In other embodiments, the active component 2' can be located outside the gear box 5, and the detection mechanism can also be set outside the gear box 5, and those skilled in the art can flexibly set it according to needs.

In the driving system provided in this embodiment, the driving mechanism 3 drives the active component 2 ′ to rotate, and the lead screw 1 moves along the first direction a under the guidance of, for example, the guide mechanism mentioned below to push the piston. When the movement of the lead screw 1 along the first direction a is blocked, since the active member 2' is configured to be movable along the second direction b, the active member 2' The rotation of the active member 2' causes the active member 2' to move along the second direction b relative to the lead screw 1, and then the detection mechanism detects whether the movement of the active member 2' along the second direction b satisfies the set condition.

Therefore, by using the drive system provided in Embodiment 4, by causing the active component 2' to respond to the blockage of the lead screw 1 to produce an action, and detecting the action of the active component 2' through the detection mechanism, it is possible to accurately and timely discover or determine the fluid The condition of the infusion set (eg, whether it is clogged).

【Example 5】

Fig. 5 shows a schematic structural diagram of a drive system according to Embodiment 5 of the present invention, in which the power source is omitted. The drive system is applied in a fluid infusion device, for example, in an attached pump for injecting medical fluid to a patient. Overall, the fluid infusion device provided by Embodiment 5 includes a driving component, a driven component, a driving mechanism and a detecting mechanism.

In this embodiment, the same as or similar to Embodiment 4, the lead screw 1 is a driven member for pushing the piston along the first direction a. The active member 2' cooperates with the screw thread of the lead screw 1 and is configured to generate movement in the second direction b in response to the resistance of the lead screw 1 to movement in the first direction a of pushing the piston. For related descriptions, please refer to the descriptions in Embodiment 4, and details are not repeated here.

In this embodiment, the driving mechanism includes a power source (for example, a motor, not shown) and a transmission gear 32' as shown in FIG. 5 . Wherein, the final driven gear 321' of the transmission gear 32' is a spur gear, and the outer periphery of the driving member 2' has spur teeth matched with the final driven gear 321'. In other words, the active member 2' not only cooperates with the screw thread of the lead screw 1, but also cooperates with the final driven gear 321' in the form of cylindrical spur teeth, so that when the movement of the lead screw 1 along the first direction a is blocked, an Movement in the second direction b.

In this embodiment, a structural arrangement is provided to make the active member 2' reversely move in response to the blockage of the movement of the lead screw 1 along the first direction a. The drive system with such a structural arrangement can respond to the blockage of the lead screw 1 along the first direction a to produce an action that can be detected by the detection mechanism 4, which facilitates accurate and timely detection of the state of the fluid infusion device.

Optionally, in an implementation manner of this embodiment, the detection mechanism 4 is a pressure sensor. As shown in FIG. 5 , the pressure sensor is arranged at a position opposite to the end of the active member 2 ′ away from the piston, for example, the pressure sensor remains in contact with the active member 2 ′. The pressure sensor is used to withstand the pressure generated by the movement of the active component 2' along the second direction b, and when the pressure reaches a threshold, output a signal indicating that the pressure reaches a threshold. In other implementations of this embodiment, a displacement sensor may also be used instead of the pressure sensor 4 .

Optionally, in this implementation manner, the detection mechanism 4 may be fixed on, for example, a gear box, a specially provided base, and the like. Those skilled in the art can flexibly set it according to needs, and the present invention does not specifically limit it.

Optionally, in an implementation of this embodiment, the drive system may further include a control mechanism (not shown), configured to determine the working state of the fluid infusion device according to the output result of the detection mechanism 4, and/or, It is used to control the drive mechanism 3 according to the output result of the detection mechanism 4 .

[Example 6]

Embodiment 6 of the present invention provides a fluid infusion device. The fluidic device includes a reservoir, a fluid delivery mechanism, a piston, and a drive system. Wherein, the liquid reservoir is used to contain fluid (for example, medical solution). A fluid delivery mechanism is in communication with the reservoir for delivering fluid to a target subject (eg, a patient). The piston is configured to be movable within the reservoir along the axial direction of the reservoir. A drive system is used to move the piston axially within the reservoir to deliver fluid within the reservoir to the subject via the fluid delivery mechanism.

For the description of the drive system, please refer to the relevant descriptions in the previous embodiments, which will not be repeated here.

By using the fluid infusion system provided in this embodiment, the state of the fluid infusion device can be accurately and timely discovered/determined.

[Example 7]

Fig. 6 shows a schematic diagram of the overall structure of a fluid infusion device according to Embodiment 7 of the present invention, and Fig. 7 shows a schematic diagram of the structure of a guiding mechanism. Wherein, the guide mechanism shown in FIG. 7 can be used in conjunction with the driving system provided by Embodiment 2 or Embodiment 3 of the present invention, and the guide nut 2 is used to push the piston along the first direction a; the fluid infusion device shown in FIG. 6 is The drive system provided by Embodiment 2 or Embodiment 3 of the present invention can be used. A detailed description will be given below in conjunction with the accompanying drawings.

In this embodiment, as shown in FIG. 6 , the fluid infusion device includes a liquid reservoir 9 , a piston 7 , a fluid delivery mechanism, a driving mechanism 3 , a detection mechanism 4 , a lead screw 1 and a nut 2 . Wherein, the liquid reservoir 9 is used to contain fluid; the fluid delivery mechanism communicated with the liquid reservoir 9 is used to deliver the fluid to the object, for example, to deliver the liquid medicine to the patient through the fluid injection needle 10; 9 moves along the axial direction of the liquid reservoir 9; the drive mechanism 3, the detection mechanism 4, the lead screw 1 and the nut 2 constitute the drive system as described in Embodiment 2 or Embodiment 3.

In this embodiment, referring to FIG. 6 and FIG. 7 , the nut 2 is fixedly connected with the pusher 6 . The pusher 6 is connected with the piston 7 for pushing the piston 7 . There is a guide (eg, a rectangular lug) 61 at the end of the pusher 6 away from the piston 7 . A fixed guide sleeve 8 is provided on the outer periphery of the pusher 6 , and the guide portion 61 is inserted into a guide groove in the guide sleeve 8 . Thus, as the screw rod 1 rotates, the nut 2 can move forward or backward in a straight line.

In this embodiment, referring to Fig. 2, Fig. 6 and Fig. 7, under the driving force, the lead screw 1 rotates with the rotation of the final driven gear 321 of the transmission gear 32, so that the nut 2 and the pusher 6 (in In an embodiment of the present invention, the two can be used together as a driven part) to push the piston 7 along the first direction a under the guidance of the guide sleeve 8 , so as to discharge the fluid from the liquid reservoir 9 .

It should be noted that the guide mechanisms mentioned in this embodiment and the following embodiments are intended to assist in explaining the working process of the drive system provided by the related embodiments of the present invention, so as to more clearly describe the various embodiments of the present invention. It does not limit the protection scope of each embodiment of the present invention.

[Embodiment 8]

In Embodiment 7, referring to FIG. 7 , the guide mechanism for guiding the nut 2 to move axially along the lead screw 1 is described, and the guide mechanism is suitable for cooperating with the drive system provided in Embodiment 2 and Embodiment 3.

In Embodiment 8, a guide mechanism suitable for cooperating with the driving systems provided in Embodiment 4 and Embodiment 5 is provided. The guide mechanism (not shown) includes: a first guide portion arranged on the lead screw 1, and a fixed guide member, the guide member has the function of cooperating with the first guide portion to make the lead screw 1 move along its own axis. to the moving second guide. Wherein, with the location of the active component 2' as a boundary, the first guide portion and the guide piece are both arranged on the side of the active component 2' away from the piston.

Optionally, in an implementation manner of this embodiment, one of the first guide part and the second guide part is a protruding structure, and the other is a concave part structure matched with the protruding structure . Exemplarily, the first guide portion is similar to the guide portion 61 shown in FIG. 7 , and the second guide portion is similar to the guide groove of the guide sleeve 8 shown in FIG. 7 .

Multiple embodiments according to the present invention have been described in detail above with reference to the accompanying drawings. Those skilled in the art should understand that components, mechanisms, etc. in each embodiment can be combined in a reasonable manner. Of course, through the combination of related structures, the driving system and the fluid infusion device in other embodiments of the present invention can also have the above-mentioned multiple advantages at the same time. Combinations, additions, and replacements of features by those skilled in the art based on the technology and design concepts provided by the present invention all belong to the protection scope of the present invention.

The terms and expressions used in the description of the present invention are for the purpose of illustration only and are not meant to be limiting. Those skilled in the art will understand that various changes may be made to the details of the above-described embodiments without departing from the basic principles of the disclosed embodiments. Accordingly, the scope of the present invention is to be determined only by the claims, in which all terms are to be read in their broadest reasonable meaning unless otherwise indicated.

Claims (13)

1. A drive system for a fluid infusion device, the drive system comprising: Active components; a drive mechanism for driving the active member to rotate; and driven member; It is characterized in that, The driven member is configured to cooperate with the active member so that the two can generate relative displacement while rotating relative to each other, wherein one of the active member and the driven member is configured to: be able to respond to the active member Obstruction of movement of the other of the member and the driven member in a first direction that pushes a piston of the fluid infusion set produces movement in a second direction that is opposite to the first direction ; The drive system also includes a detection mechanism for detecting movement of one of the driving member and the driven member along the second direction. 2. The drive system according to claim 1, wherein the detection mechanism comprises: a pressure sensor disposed at a position opposite to an end of one of the driving member and the driven member away from the piston, for detecting that one of the driving member and the driven member moves along the second direction The pressure generated by the movement. 3. The drive system according to claim 1, wherein the detection mechanism comprises: A displacement sensor for detecting displacement of one of the driving member and the driven member along the second direction. 4. drive system as claimed in claim 2 or 3, is characterized in that, described drive system also comprises: A control mechanism, the control mechanism is used to determine the working state of the fluid infusion device according to the output result of the detection mechanism, and/or is used to control the driving mechanism according to the output result of the detection mechanism. 5. The drive system according to any one of claims 1-3, characterized in that, The active component is a lead screw; The driven member cooperates with the thread of the driving member for pushing the piston along the first direction. 6. The drive system of claim 5, wherein the drive mechanism comprises: power source; Transmission gear; Wherein, the final driven gear of the transmission gear is located at the end of the lead screw away from the piston, and is used to rotate together with the lead screw. 7. The drive system of claim 6, wherein: The final driven gear of the transmission gear is fixedly connected with the lead screw; The final driving gear and the final driven gear of the transmission gear are spur gears; There is a space allowing the final driven gear to move in the second direction in the gear case housing the transmission gear. 8. The drive system of claim 6, wherein: The final driven gear of the transmission gear is relatively slidably connected with the lead screw. 9. The drive system according to any one of claims 1-3, characterized in that, The driven member is a lead screw for pushing the piston along the first direction; The active component cooperates with the screw thread of the lead screw. 10. The drive system of claim 9, wherein the drive mechanism comprises: power source; Transmission gear; Wherein, the final driven gear of the transmission gear is a spur gear; The outer periphery of the driving member has spur teeth that cooperate with the final driven gear. 11. Drive system according to claim 6 or 10, characterized in that, The power source is a motor, and the output shaft of the motor is not coaxial with the lead screw. 12. Drive system according to claim 6 or 10, characterized in that, The power source is a motor, and the position of the motor is fixed. 13. A fluid infusion device, comprising: a reservoir for containing fluid; a fluid delivery mechanism in communication with the reservoir for delivering fluid to a subject; a piston configured to move axially within the reservoir along the reservoir; and A drive system as claimed in any one of claims 1 to 12 for moving said piston axially within said reservoir to cause fluid within said reservoir to be delivered via said fluid delivery mechanism to the object.