CN209848006U

CN209848006U - Infusion mechanism

Info

Publication number: CN209848006U
Application number: CN201920320238.0U
Authority: CN
Inventors: 胡国雄; 王岳鹏
Original assignee: Shenzhen Zhongke Biological Medical Electronics Co Ltd
Current assignee: Shenzhen Zhongke Biological Medical Electronics Co Ltd
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2019-12-27
Anticipated expiration: 2029-03-13

Abstract

The utility model discloses an infusion mechanism, which comprises a shell, an infusion component and a driving piece; the infusion component comprises a sliding rod, a transmission gear, a rotating part, a fixed seat, a fixed sleeve, an infusion tube, a piston and a push broach, and the infusion end of the infusion tube penetrates through the fixed sleeve and the shell to be connected with an external infusion part. Adopt above-mentioned structural design's infusion mechanism, rotate the piece under the drive action of driving piece, follow the slide bar and come and go the slip in the time of the rotation to through the broach that rotates the surface fastening, promote the piston and feed when dissecting the transfer line, then make the liquid medicine in the transfer line accomplish accurate infusion.

Description

Infusion mechanism

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an infusion mechanism.

Background

In the medical field, a typical representative of portable high-precision human drug solution infusion is an insulin pump, which is used for treating diabetic patients. Insulin is measured in "units" divided into 100 units per cc (or mL), assuming the standard U-100 concentration, in this manner one unit corresponds to 10. mu.L. Typically each reservoir stores 3ml of insulin, i.e. 300 units, in an appearance similar to a short and thick small syringe, with a total reservoir piston travel of about 3cm and an internal diameter of about 12 mm. Assuming that the injection rate is set to be 1 unit/hour, the insulin pump will slowly push the piston to advance 0.1mm at a constant speed within 1 hour, and the piston advance distance is too short, and the constant speed needs to be maintained, which causes the electromechanical transmission part of the insulin pump to be extremely precise and complex, and the cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an infusion mechanism, simple structure infuses the precision height, and is with low costs.

To achieve the purpose, the utility model adopts the following technical proposal:

an infusion mechanism comprises a shell, an infusion assembly pivoted in a cavity of the shell, and a driving piece used for driving the infusion assembly to work; the infusion subassembly includes that pin joint in slide bar, slip cap between the relative both sides wall of casing locate the slide bar and with slide bar coaxial engagement's drive gear, cover are located drive gear and with drive gear coaxial engagement's rotation piece, cover are located rotate a one end and with rotate a fixing base of threaded connection, cover are located rotate the other end and with rotate a matched with fixed cover, bury underground in the transfer line of the thread groove of fixed cover inside wall, set up in the transfer line keeps away from the piston in the port of liquid end and bury underground in rotate the outer peripheral face and be used for the drive the push broach that the piston promoted the liquid medicine and fed, the infusion end of transfer line runs through fixed cover reaches the casing is connected with outside infusion spare.

The knife head part of the push knife extends out of the threaded groove and is matched with one end face, away from the liquid medicine, of the piston.

The inner peripheral surface of the fixed seat is concavely provided with an internal thread, and the internal thread is matched with an external thread which is convexly arranged on the outer peripheral surface of the rotating part.

The external thread screwing length of the peripheral surface of the rotating piece is smaller than that of the rotating piece.

Wherein, the side wall of the fixed sleeve is provided with a first guide hole for leading out the infusion tube.

The side wall of the shell is provided with a second guide hole, and the infusion end of the infusion tube sequentially penetrates through the first guide hole and the second guide hole.

And bushings are embedded in the first guide hole and the second guide hole.

The shaft section of the transmission gear is arranged in a T shape, gear teeth on the first outer peripheral surface of the transmission gear are meshed with gear teeth which are circumferentially and uniformly distributed on the inner peripheral surface of the port of the rotating part, and gear teeth on the second outer peripheral surface of the transmission gear are meshed with a driving gear of the driving part.

The fixing seat and the outer peripheral surface of the fixing sleeve are fastened with the mounting positions respectively.

Wherein, the fixing base with fixed cover coaxial setting and external diameter equal.

The utility model has the advantages that: the utility model provides an infusion mechanism, which comprises a shell, an infusion component pivoted in the cavity of the shell, and a driving piece for driving the infusion component to work; the infusion subassembly includes that pin joint in slide bar, slip cap between the relative both sides wall of casing locate the slide bar and with slide bar coaxial engagement's drive gear, cover are located drive gear and with drive gear coaxial engagement's rotation piece, cover are located rotate a one end and with rotate a fixing base of threaded connection, cover are located rotate the other end and with rotate a matched with fixed cover, bury underground in the transfer line of the thread groove of fixed cover inside wall, set up in the transfer line keeps away from the piston in the port of liquid end and bury underground in rotate the outer peripheral face and be used for the drive the push broach that the piston promoted the liquid medicine and fed, the infusion end of transfer line runs through fixed cover reaches the casing is connected with outside infusion spare. Adopt above-mentioned structural design's infusion mechanism, rotate the piece under the drive action of driving piece, follow the slide bar and come and go the slip in the time of the rotation to through the broach that rotates the surface fastening, promote the piston and feed when dissecting the transfer line, then make the liquid medicine in the transfer line accomplish accurate infusion.

Drawings

Fig. 1 is an exploded view of an infusion mechanism of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a cross-sectional view a-a of fig. 2.

Fig. 4 is an exploded view of the infusion assembly of fig. 1.

Fig. 5 is an isometric view of fig. 1.

Fig. 6 is a partially enlarged view at B in fig. 4.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 6, the present embodiment provides an infusion mechanism, which includes a housing composed of a lower housing 11 and an upper cover 12, an infusion set 2 pivotally connected to a cavity of the housing, and a driving member 3 for driving the infusion set 2 to operate;

specifically, in this embodiment, the infusion assembly 2 includes a sliding rod 21 pivotally connected between two opposite side walls of the housing, a transmission gear 22 slidably sleeved on the sliding rod 21 and coaxially engaged with the sliding rod 21, a rotation member 23 sleeved on the transmission gear 22 and coaxially engaged with the transmission gear 22, a fixing seat 24 sleeved on one end of the rotation member 23 and threadedly connected with the rotation member 23, a fixing sleeve 25 sleeved on the other end of the rotation member 23 and matched with the rotation member 23, an infusion tube 26 embedded in a thread groove on the inner side wall of the fixing sleeve 25, a piston 27 disposed in a port of the infusion tube 26 far from the liquid outlet end, and a push-type broach 28 embedded in the outer peripheral surface of the rotation member 23 and used for driving the piston 27 to push the liquid medicine to feed, the infusion end of the infusion tube 26 penetrates through the fixed sleeve 25 and the shell to be connected with an external infusion part. In this embodiment, the driving member 3 may be configured as a motor, and the driving gear on the main shaft of the motor drives the transmission gear 22 to rotate, and then drives the rotating member 23 and the fixed seat 24 to rotate relatively, and due to the threaded connection between the fixed seat 24 and the rotating member 23, the rotating member 23 will slide along the sliding rod 21 while rotating.

In this embodiment, in order to facilitate the rotation of the transmission gear 22 and to slide along the sliding rod 21, gear teeth are circumferentially disposed on the outer circumferential surface of the sliding rod 21 along the length direction, and two ends of the sliding rod 21 are rotatably connected to bearing sleeves embedded in two opposite side walls of the housing.

Specifically, in this embodiment, the inner peripheral surface of the fixing seat 24 is concavely provided with an internal thread, and the internal thread is matched with an external thread convexly provided on the outer peripheral surface of the rotating member 23.

In addition, in order to enable the axial movement between the rotating part 23 and the fixed seat 24, the external thread screwing length of the outer peripheral surface of the rotating part 23 is smaller than that of the rotating part 23.

Further, in order to facilitate the infusion tube 26 to be led out of the housing and be connected with an external infusion part, in this embodiment, the side wall of the fixing sleeve 25 is provided with a first guide hole for leading out the infusion tube 26, the side wall of the housing is provided with a second guide hole, the infusion end of the infusion tube 26 sequentially penetrates through the first guide hole and the second guide hole, and the first guide hole and the second guide hole are internally embedded with a bushing, so that the abrasion to the infusion tube 26 is reduced.

Specifically, as shown in fig. 3, in this embodiment, the axial cross section of the transmission gear 22 is arranged in a T shape, the gear teeth on the first outer circumferential surface of the transmission gear 22 are engaged with the gear teeth circumferentially and uniformly distributed on the inner circumferential surface of the port of the rotating member 23, the gear teeth on the second outer circumferential surface of the transmission gear 22 are engaged with the driving gear of the driving member 3, in addition, in order to make the transmission gear 22 and the sliding rod 21 slide, a through hole is axially arranged in the middle of the transmission gear 22 in a penetrating manner, and the gear teeth engaged with the sliding rod 21 are arranged on the inner circumferential surface of the through hole.

In this embodiment, in order to facilitate the installation and fixation of the fixed seat 24 and the fixed sleeve 25, as shown in fig. 3, an installation site 13 is formed in the middle of the housing in a penetrating manner, and the installation site 13 is formed in a cylindrical shape, so that the fixed seat 24 and the fixed sleeve 25 having the same outer diameter can be fastened in the installation site.

By adopting the infusion mechanism with the structural design, in order to facilitate the rotation of the rotating part 23, the infusion tube 26 at one end of the piston 27 far away from the liquid medicine is split through the push-type broach 28, and then the piston 27 is pushed to feed, wherein the head part of the push-type broach 28 extends out of the thread groove and is fastened with one end face of the piston 27 far away from the liquid medicine.

Adopt the infusion mechanism of above-mentioned mode design, bury infusion pipe 26 in the thread groove of fixed cover 25 inside wall for the length of infusion pipe 26 obtains great extension, and promotes piston 27 through broach 28 and feeds, accomplishes the infusion of liquid medicine with this, and the setting of this kind of mode can effectively reduce the required precision to the mechanism part when promoting the infusion precision, and traditional liquid medicine infusion mode relatively has greatly reduced the manufacturing cost of infusion mechanism.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. An infusion mechanism, characterized by: comprises a shell, an infusion component pivoted in a cavity of the shell and a driving component for driving the infusion component to work; the infusion subassembly includes that pin joint in slide bar, slip cap between the relative both sides wall of casing locate the slide bar and with slide bar coaxial engagement's drive gear, cover are located drive gear and with drive gear coaxial engagement's rotation piece, cover are located rotate a one end and with rotate a fixing base of threaded connection, cover are located rotate the other end and with rotate a matched with fixed cover, bury underground in the transfer line of the thread groove of fixed cover inside wall, set up in the transfer line keeps away from the piston in the port of liquid end and bury underground in rotate the outer peripheral face and be used for the drive the push broach that the piston promoted the liquid medicine and fed, the infusion end of transfer line runs through fixed cover reaches the casing is connected with outside infusion spare.

2. An infusion mechanism according to claim 1, wherein: the knife head part of the push knife extends out of the thread groove and is matched with one end face, away from the liquid medicine, of the piston.

3. An infusion mechanism according to claim 1, wherein: the inner peripheral surface of the fixed seat is concavely provided with an internal thread, and the internal thread is matched with an external thread which is convexly arranged on the outer peripheral surface of the rotating part.

4. An infusion mechanism according to claim 3, wherein: the screwing length of the external thread on the peripheral surface of the rotating piece is smaller than that of the rotating piece.

5. An infusion mechanism according to claim 1, wherein: the side wall of the fixed sleeve is provided with a first guide hole for leading out the infusion tube.

6. An infusion mechanism according to claim 5, wherein: the lateral wall of the shell is provided with a second guide hole, and the infusion end of the infusion tube sequentially penetrates through the first guide hole and the second guide hole.

7. An infusion mechanism according to claim 6, wherein: and the first guide hole and the second guide hole are internally embedded with bushings.

8. An infusion mechanism according to claim 1, wherein: the shaft section of the transmission gear is arranged in a T shape, gear teeth on the first outer peripheral surface of the transmission gear are meshed with gear teeth which are circumferentially and uniformly distributed on the inner peripheral surface of the port of the rotating part, and gear teeth on the second outer peripheral surface of the transmission gear are meshed with a driving gear of the driving part.

9. An infusion mechanism according to claim 1, wherein: the cavity of the shell is internally provided with an installation position, and the fixed seat and the peripheral surface of the fixed sleeve are respectively fastened with the installation position.

10. An infusion mechanism according to claim 1, wherein: the fixing seat and the fixing sleeve are coaxially arranged and have the same outer diameter.