Cannula device for infusion equipment

Abstract

The present invention discloses a cannula device for an infusion device, which comprises: an outer shell, a mounting plate, an inner needle seat, an outer needle seat and a firing rebound assembly, wherein the firing rebound assembly is arranged on the mounting plate, the outer needle seat is clamped at the bottom of the mounting plate, the inner needle seat is mounted on the firing rebound assembly, the inner needle seat is arranged directly above the outer needle seat, the firing rebound assembly drives the inner needle seat to pass through, hit and move away from the outer needle seat, the outer shell is sleeved on the outer side of the mounting plate, and the outer needle seat is arranged at the bottom of the outer shell. The purpose of the present invention is to provide a cannula device for an infusion device with a reasonable structure, a high release success rate, automatic rebound to reduce the psychological pressure of the user, and safe and hygienic.

Description

Technical Field

[0001] The present invention relates to the field of medical supplies, and more particularly to a cannula device for an infusion device. Background Art

[0002] Infusion devices are used to deliver substances such as drugs into the subcutaneous layer of a patient's skin. Devices for assisting the insertion of the cannula of an infusion device into the patient's skin are known. For example, some devices use a spring to automatically drive a needle into the patient's skin, thereby introducing the cannula of the infusion device into the subcutaneous layer. Therefore, there is a danger of inadvertent contact with the needle. In addition, before insertion, when the needle is seen, the patient's reaction may be negative, for example, unwillingness to insert the needle into the skin. Prior to and / or after the introduction of the infusion device, the prior art devices do not adequately shield the needle, increasing the psychological pressure and burden on the user.

[0003] At the same time, the existing technology also has the following defects: it is not easy for patients to use and has health risks. For example, some patients may have difficulty in loading the infusion device into the insertion device, so it is hoped that a new design for the device is provided to help guide the infusion device into the patient's skin; since the patient inevitably needs to touch the hose with his hands when assembling the existing technology, there are health risks; most of them require the patient to actively apply force, which will cause a certain psychological pressure on the patient during use, resulting in a low success rate of releasing the infusion device, and the device is not placed accurately. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a cannula device for an infusion device which has a reasonable structure, a high release success rate, automatic rebound and thus reduces the psychological pressure of the user, and is safe and hygienic.

[0005] According to one aspect of the present invention, a cannula device for an infusion device is provided, which includes: an outer shell, a mounting plate, an inner needle seat, an outer needle seat and a firing rebound assembly, the firing rebound assembly is arranged on the mounting plate, the outer needle seat is engaged with the bottom of the mounting plate, the inner needle seat is installed on the firing rebound assembly, the inner needle seat is arranged directly above the outer needle seat, the firing rebound assembly drives the inner needle seat to pass through, impact and move away from the outer needle seat, the outer shell is sleeved on the outside of the mounting plate, and the outer needle seat is arranged at the bottom of the outer shell.

[0006] In some embodiments, the firing rebound assembly includes: a firing trigger, a connecting rod, a crank, a torsion spring, a cylindrical pin, a first hinge, a second hinge and a slide rail, the slide rail is vertically arranged on the mounting plate, the inner needle seat is installed in the slide rail and can move up and down along the slide rail, the bottom of the connecting rod is hinged to the inner needle seat through the second hinge, the top of the connecting rod is hinged to one end of the crank through the first hinge, and the other end of the crank is hinged to the mounting plate through the cylindrical pin, the torsion spring is sleeved on the cylindrical pin and connected to the crank and drives the crank to rotate around the cylindrical pin, the firing trigger is hinged to the mounting plate through the third hinge, and the firing trigger is hooked to the first hinge to limit the connecting rod at the crank position.

[0007] In some embodiments, the firing trigger includes a firing part, a connecting part and a fixing part. The firing part is fixedly arranged at one end of the connecting part, and the fixing part is arranged at the other end of the connecting part. The fixing part is in the shape of a curved hook and is hooked to the first hinge. The firing part drives the fixing part to rotate with the third hinge so that the fixing part is separated from the first hinge.

[0008] In some embodiments, two sliding grooves are symmetrically provided on the slide rail.

[0009] In some embodiments, the inner needle seat includes: a fixed seat, a steel needle and a slider, the steel needle is fixedly set at the bottom center of the fixed seat, and two sliders are symmetrically set on the fixed seat. The sliders are inserted in the sliding groove and can move up and down along the sliding groove.

[0010] In some embodiments, a notch is provided on the top of the housing, and the firing trigger extends out of the housing through the notch.

[0011] In some embodiments, the outer needle seat includes: a seat body, a connecting hole and a soft needle part. The connecting hole is provided in the center of the seat body, the bottom of the soft needle part is inserted in the connecting hole, and the top of the soft needle part is connected to the inner needle seat.

[0012] In some embodiments, the soft needle portion includes: a soft needle tube and a limiting body, the soft needle tube is provided at the bottom of the limiting body, and the limiting body is limited to the top of the communicating hole after the impact.

[0013] The cannula device of the infusion equipment of the present invention utilizes the elastic force of the torsion spring through the firing rebound component when in use, drives the crank slider to move, and then drives the inner needle seat at the bottom of the connecting rod to move downward in the slide rail, so that the steel needle drives the hose on the outer needle seat to penetrate the subcutaneous layer of the user, and after completion, the connecting rod continues to rotate to drive the steel needle to retract along the track. During work, the firing and retraction are rapid, and the user suffers little pain. During the whole process, the steel needle is hidden inside the present invention to prevent psychological pressure and burden on the patient and thus cause discomfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the cannula device of the infusion device of the present invention;

[0015] Figure 2 is an exploded schematic diagram of the cannula device of the infusion device of the present invention;

[0016] Figure 3 is a schematic diagram of the initial state of the cannula device of the infusion device of the present invention;

[0017] Figure 4 Schematic diagram of the firing state of the cannula device of the infusion device of the present invention;

[0018] Figure 5 It is a schematic diagram of the retracted state of the cannula device of the infusion device of the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and equivalent changes or substitutions in functions, methods or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the terms can be understood according to the specific circumstances.

[0021] like Figure 1 and Figure 2 As shown, the cannula device of the infusion equipment described in the present invention includes: an outer shell 1, a mounting plate 2, an inner needle seat 3, an outer needle seat 4 and a firing rebound assembly 5. The firing rebound assembly 5 is arranged on the mounting plate 2, the outer needle seat 4 is engaged with the bottom of the mounting plate 2, the inner needle seat 3 is installed on the firing rebound assembly 5, the inner needle seat 3 is arranged directly above the outer needle seat 4, the firing rebound assembly 5 drives the inner needle seat 3 to pass through, collide and move away from the outer needle seat 4, the outer shell 1 is sleeved on the outside of the mounting plate 2, and the outer needle seat 4 is arranged at the bottom of the outer shell 1. By firing the rebound component 5 and utilizing the elastic force of the torsion spring 54 when in use, the crank 53 and the slider 33 are driven to move, thereby driving the inner needle seat 3 at the bottom of the connecting rod 52 to move downward in the slide rail 58, so that the steel needle 32 drives the hose on the outer needle seat 4 to penetrate the subcutaneous layer of the user, and after completion, the connecting rod 52 continues to rotate to drive the steel needle 32 to retract along the track. During work, the firing and retraction are rapid, and the user suffers little pain. During the whole process, the steel needle 32 is hidden inside the present invention to prevent psychological pressure and burden on the patient and thus cause discomfort.

[0022] The firing rebound assembly 5 includes: a firing trigger 51, a connecting rod 52, a crank 53, a torsion spring 54, a cylindrical pin 55, a first hinge 56, a second hinge 57 and a slide rail 58. The slide rail 58 is vertically arranged on the mounting plate 2. The inner needle seat 3 is installed in the slide rail 58 and can move up and down along the slide rail 58. The bottom of the connecting rod 52 is hinged to the inner needle seat 3 through the second hinge 57, and the top of the connecting rod 52 is hinged to one end of the crank 53 through the first hinge 56. The other end of the crank 53 is hinged to the mounting plate 2 through the cylindrical pin 55. The torsion spring 54 is sleeved on the cylindrical pin 55 and connected to the crank 53 and drives the crank 53 to rotate around the cylindrical pin 55. The firing trigger 51 is hinged to the mounting plate 2 through the third hinge 59. The firing trigger 51 is hooked with the first hinge 56 to limit the connecting rod 52 at the crank 53 position. The crank 53 is given a driving force through the torsion spring 54. When the firing trigger 51 is released and is no longer in the position restricting the connecting rod 52 and the crank 53, the torsion spring 54 drives the crank 53 to rotate around the cylindrical pin 55, thereby driving the bottom of the connecting rod 52 to move downward, and then driving the inner needle seat 3 to move downward on the slide rail 58, and using the steel needle 32 to drive the outer needle seat 4 and the soft needle tube 431 to penetrate the subcutaneous layer; the crank 53 continues to move counterclockwise, driving the connecting rod 52 to move counterclockwise, and at the same time driving the needle seat to move upward. At the same time, the steel needle 32 is taken out, and the soft needle and the outer needle seat 4 remain in the human body.

[0023] It should be noted that when installing the torsion spring 54, it is necessary to set a mounting groove for the torsion spring 54 on the mounting plate 2, and at the same time set a groove or a limit block on the crank 53 to contract the torsion spring 54 and then obtain driving force.

[0024] The firing trigger 51 includes a firing part 511, a connecting part 512 and a fixing part 513. The firing part 511 is fixedly arranged at one end of the connecting part 512, and the fixing part 513 is arranged at the other end of the connecting part 512. The fixing part 513 is in the shape of a curved hook, and the fixing part 513 is hooked to the first hinge 56. The firing part 511 drives the fixing part 513 to rotate with the third hinge 59 so that the fixing part 513 is separated from the first hinge 56. The firing part 511 is arranged on the outside of the shell 1 to facilitate the user to operate and control the operation of the firing rebound assembly 5. The hook-shaped fixing part 513 is used to hook the first hinge 56 in the initial unfired state, so that the connecting rod 52 and the crank 53 are kept in the initial state, and the torsion spring 54 is in a tensioned state; after external force is applied to the firing part 511, the fixing part 513 is disengaged from the first hinge 56, and the tensioned torsion spring 54 is released, driving the crank 53 to rotate and then driving the crank 53 to rotate around the cylindrical pin 55, thereby driving the bottom of the connecting rod 52 to move downward, and then driving the inner needle seat 3 to move downward on the slide rail 58, and using the steel needle 32 to drive the outer needle seat 4 and the soft needle tube 431 to penetrate the subcutaneous layer.

[0025] Two sliding grooves 581 are symmetrically arranged on the slide rail 58. The sliding grooves 581 are used to guide the movement of the inner needle seat 3. The sliding grooves 581 are preferably set as U-shaped grooves with a certain stroke.

[0026] The inner needle seat 3 includes: a fixed seat 31, a steel needle 32 and a slider 33. The steel needle 32 is fixedly arranged at the bottom center of the fixed seat 31. Two sliders 33 are symmetrically arranged on the fixed seat 31. The sliders 33 are inserted in the sliding groove 581 and can move up and down along the sliding groove 581. The sliders 33 are arranged in the sliding groove 581, so that the fixed seat 31 and the steel needle 32 can move up and down in the sliding groove 581 when driven by force. The slider 33 is cylindrical, and its outer diameter is a clearance fit with the width of the sliding groove 581. At the same time, the inner wall of the sliding groove 581 and the outer wall of the slider 33 need to be as smooth as possible to reduce the friction between the sliding groove 581 and the slider 33.

[0027] A notch 11 is provided at the top of the housing 1, and the firing trigger 51 extends out of the housing 1 through the notch 11. In order to fully shield the steel needle 32 through the housing 1, the user will not see the steel needle 32 during use, thereby preventing psychological pressure.

[0028] The outer needle seat 4 includes: a seat body 41, a connecting hole 42 and a soft needle part 43. The connecting hole 42 is provided in the center of the seat body 41. The bottom of the soft needle part 43 is inserted into the connecting hole 42, and the top of the soft needle part 43 is connected to the inner needle seat 3. In the initial state, the soft needle part 43 is not fully inserted into the connecting hole 42, and the steel needle 32 is inserted into the top of the soft needle part 43. After being hit by the outer needle seat 4, the steel needle 32 drives the soft needle part 43 to pierce into the human body together.

[0029] The soft needle part 43 includes: a soft needle tube 431 and a stopper 432. The bottom of the stopper 432 is provided with the soft needle tube 431. The stopper 432 is limited to the top of the connecting hole 42 after the collision. At the same time, the stopper 432 of the soft needle part 43 is embedded in the top of the connecting hole 42 like a rivet. At the same time, the inner needle seat 3 hits the outer needle seat 4, and the inner needle seat 3 is pushed out of the outer shell 1.

[0030] like Figure 3 As shown, in the initial state, the torsion spring 54 is sleeved on the cylindrical pin 55 and cooperates with the slot on the shell 1, and at the same time cooperates with the limit block on the crank 53, and then the crank 53 is swung upward, and the first hinge 56 hinged to the crank 53 and the connecting rod 52 is limited by the fixing portion 513, the crank 53 and the connecting rod 52 are cooperated through the first hinge 56, the inner needle seat 3 and the connecting rod 52 are cooperated through the second hinge 57, the inner needle seat 3 is at the top of the slide rail 58, the soft needle part 43 is at the bottom of the steel needle 32, and the outer needle seat 4 is stuck on the shell 1.

[0031] like Figure 4As shown, when in the firing state, force is applied to the firing trigger 51, the firing trigger 51 rotates around the third hinge 59, the fixing part 513 disengages from the first hinge 56, the crank 53 loses its limit, and then the torsion spring 54 loses its limit and spreads out, the crank 53 is driven by the torsion spring 54 to move counterclockwise, the crank 53 drives the connecting rod 52 to move counterclockwise, the connecting rod 52 drives the inner needle seat 3 to move vertically along the slide rail 58, the inner needle seat 3 drives the steel needle 32, the steel needle 32 drives the soft needle part 43 to pierce the human body together, and at the same time, the limiting body 432 of the soft needle part 43 is embedded in the top of the connecting hole 42 like a rivet, and at the same time, the inner needle seat 3 hits the outer needle seat 4, and the inner needle seat 3 is pushed out from the outer shell 1.

[0032] like Figure 5 As shown, when in the retracted state, after the outer needle seat 4 is pushed out, the crank 53 continues to move counterclockwise, driving the connecting rod 52 to move counterclockwise, and at the same time driving the inner needle seat 3 to move upward along the slide rail 58. At the same time, the steel needle 32 is brought out, and the soft needle part 43 and the outer needle seat 4 remain in the human body.

[0033] The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this field, other modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cannula device for an infusion device, characterized in that: include: The outer shell, the mounting plate, the inner needle seat, the outer needle seat and the firing rebound assembly, the firing rebound assembly is arranged on the mounting plate, the outer needle seat is engaged with the bottom of the mounting plate, the inner needle seat is installed on the firing rebound assembly, the inner needle seat is arranged just above the outer needle seat, the firing rebound assembly drives the inner needle seat to pass through, hit and move away from the outer needle seat, the outer shell is sleeved on the outer side of the mounting plate, and the outer needle seat is arranged at the bottom of the outer shell; the firing rebound assembly includes: a firing trigger, a connecting rod, a crank, a torsion spring, a cylindrical pin, a first hinge, a second hinge and a slide The slide rail is vertically arranged on the mounting plate, the inner needle seat is installed in the slide rail and can move up and down along the slide rail, the bottom of the connecting rod is hinged to the inner needle seat through a second hinge, the top of the connecting rod is hinged to one end of the crank through a first hinge, the other end of the crank is hinged to the mounting plate through a cylindrical pin, the torsion spring is sleeved on the cylindrical pin, the crank is connected and drives the crank to rotate around the cylindrical pin, the firing trigger is hinged to the mounting plate through a third hinge, and the firing trigger is hooked to the first hinge to limit the connecting rod at the crank position; The outer needle seat comprises: a seat body, a connecting hole and a soft needle part, wherein the center of the seat body is provided with a connecting hole, the bottom of the soft needle part is inserted into the connecting hole, and the top of the soft needle part is connected to the inner needle seat; The soft needle part comprises: a soft needle tube and a limiting body, the bottom of the limiting body is provided with a soft needle tube, and the limiting body is limited at the top of the communicating hole after impact.

2. The cannula device of the infusion device according to claim 1, characterized in that: The firing trigger includes a firing part, a connecting part and a fixing part. The firing part is fixedly arranged at one end of the connecting part, and the fixing part is arranged at the other end of the connecting part. The fixing part is in the shape of a curved hook. The fixing part is hooked to the first hinge. The firing part drives the fixing part to rotate with the third hinge so that the fixing part is separated from the first hinge.

3. The cannula device of the infusion device according to claim 1, characterized in that: Two sliding grooves are symmetrically arranged on the slide rail.

4. The cannula device of the infusion device according to claim 3, characterized in that: The inner needle seat comprises: a fixed seat, a steel needle and a sliding block. The steel needle is fixedly arranged at the bottom center of the fixed seat. Two sliding blocks are symmetrically arranged on the fixed seat. The sliding blocks are inserted in the sliding groove and can move up and down along the sliding groove.

5. The cannula device of the infusion device according to claim 1, characterized in that: A notch is provided on the top of the shell, and the firing trigger extends out of the shell through the notch.

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