CN113041455B - Injection device - Google Patents
Injection device Download PDFInfo
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- CN113041455B CN113041455B CN201911367980.8A CN201911367980A CN113041455B CN 113041455 B CN113041455 B CN 113041455B CN 201911367980 A CN201911367980 A CN 201911367980A CN 113041455 B CN113041455 B CN 113041455B
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- ring
- push rod
- injection
- sleeve
- face gear
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
- A61M5/31551—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe including axial movement of dose setting member
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- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
本发明公开了一种注射装置，包括：壳体；相对所述壳体螺旋升降的刻度环；施加轴向注射推力的注射按钮，所述注射按钮的下端与所述刻度环的上端连接；推动所述药瓶的活塞移动的推杆；将所述注射按钮的注射推力传递至所述推杆的传递部件；所述传递部件包括回转环、驱动套和推杆套；所述回转环在圆周方向与所述注射按钮联动；所述驱动套与所述回转环相对的一端端面设置有第一端面齿圈，所述回转环的下端端面设有与所述第一端面齿圈配合的第二端面齿圈，所述驱动套在圆周方向与所述推杆联动；所述推杆套套设于所述推杆上，所述推杆套设有第一内螺纹，所述推杆设有与所述第一内螺纹配合的第一外螺纹。本发明的注射装置，能更好的控制注射剂量。
The present invention discloses an injection device, comprising: a housing; a scale ring spirally raised and lowered relative to the housing; an injection button for applying an axial injection thrust, the lower end of the injection button being connected to the upper end of the scale ring; a push rod for pushing the piston of the medicine bottle to move; a transmission component for transmitting the injection thrust of the injection button to the push rod; the transmission component comprises a slewing ring, a driving sleeve and a push rod sleeve; the slewing ring is linked with the injection button in the circumferential direction; the end face of the driving sleeve opposite to the slewing ring is provided with a first end face gear ring, the lower end face of the slewing ring is provided with a second end face gear ring matched with the first end face gear ring, the driving sleeve is linked with the push rod in the circumferential direction; the push rod sleeve is sleeved on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread. The injection device of the present invention can better control the injection dose.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to an injection device.
Background
For diabetics, their blood glucose level is important, timing care and recording is required, and in order to reduce fluctuations in the patient's blood glucose level, drug control is required. Artificial insulin is a well-known drug for lowering the blood glucose level and must be administered parenterally in order to function in the human body. Currently, the most common way to administer artificial insulin to diabetics is by subcutaneous injection, which is mostly done with disposable or fixed dose syringes, but is inconvenient in use because the dose that the patient needs to inject depends on his blood glucose level.
Although there are injection devices on the market that can regulate the dose, there is a problem in that the dose control is not accurate enough.
Disclosure of Invention
Accordingly, it is desirable to provide an injection device with better control of the injection dosage.
In order to achieve the above object, the technical solution of the embodiment of the present invention is as follows:
An embodiment of the present invention provides an injection device including:
one end of the shell is an injection end connected with a medicine bottle, and the other end of the shell is an adjusting end for adjusting dosage;
The scale ring is positioned at the adjusting end of the shell, and the scale ring and the shell are provided with corresponding thread structures;
An injection button for applying an axial injection thrust; the injection button is positioned at the adjusting end of the shell, and the lower end of the injection button is connected with the upper end of the scale ring; the scale ring spirally descends along a first circumferential direction along with the axial injection thrust of the injection button, and the injection button spirally descends along with the spiral descending of the scale ring;
The push rod is positioned in the shell and extends along the axial direction of the shell, and comprises a pushing end connected with the medicine bottle and a stress end connected with the injection button, wherein the pushing end of the push rod extends out of the injection end of the shell;
the transmission part is used for transmitting the injection pushing force of the injection button to the push rod and comprises a rotary ring, a driving sleeve and a push rod sleeve;
The rotary ring is positioned below the injection button, and the rotary ring is linked with the injection button in the circumferential direction;
The driving sleeve is positioned below the rotary ring, a first end face gear ring is arranged on the end face of one end of the driving sleeve, which is opposite to the rotary ring, the first end face gear ring is a unidirectional end face gear ring which only transmits torque in the first circumferential direction and has triangular tooth shape, a second end face gear ring matched with the first end face gear ring is arranged on the lower end face of the rotary ring, and the driving sleeve rotates along with the rotation of the rotary ring in the first circumferential direction;
The push rod sleeve is arranged below the driving sleeve and is fixed in position, the push rod sleeve is arranged on the push rod in a sleeved mode, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread.
In the scheme, the upper end of the scale ring is provided with the third end face gear ring, the third end face gear ring is a unidirectional end face gear ring which only transmits torque in the second circumferential direction and has triangular tooth shape, the lower end of the injection button is provided with the fourth end face gear ring matched with the third end face gear ring, and when the scale ring rotates in the second circumferential direction, the injection button rotates along with the rotation of the scale ring.
In the scheme, the rotary ring comprises a first rotary ring, a second rotary ring and a third rotary ring, the first rotary ring, the second rotary ring and the third rotary ring are nested in sequence in the axial direction and can mutually stretch in the axial direction and are linked in the circumferential direction, the end face of the lower end of the first rotary ring is provided with the second end face gear ring, the upper end of the third rotary ring is connected to the lower end of the injection button, and a first elastic part and a second elastic part for increasing the total axial length are arranged among the first rotary ring, the second rotary ring and the third rotary ring.
In the scheme, the injection button comprises a pressing cap and an injection force transmission sleeve which are connected with each other, the injection force transmission sleeve and the pressing cap can rotate relatively, the lower end of the injection force transmission sleeve is provided with the fourth end face gear ring, and the injection force transmission sleeve is connected with the upper end of the third rotary ring.
In the scheme, the shell comprises an outer cylinder and an inner cylinder which are fixed with each other, a gap is preset between the outer cylinder and the inner cylinder in a radial direction, the scale ring is rotatably arranged between the outer cylinder and the inner cylinder, a second internal thread is arranged on the inner wall of the scale ring, a second external thread matched with the second internal thread is arranged on the outer circle of the inner cylinder, and a reading window corresponding to the scale ring is arranged on the outer cylinder.
In the scheme, the injection device further comprises a supporting sleeve for supporting the transmission part, the supporting sleeve is sleeved on the push rod and is positioned between the driving sleeve and the push rod sleeve, a fifth end face gear ring is arranged on the upper end face of the supporting sleeve and is a unidirectional end face gear ring which only transmits torque in the second circumferential direction and has triangular tooth shape, a sixth end face gear ring matched with the fifth end face gear ring is arranged on the lower end face of the driving sleeve, and the supporting sleeve is fixed to the shell.
In the above scheme, the injection device further comprises a push rod head, wherein the push rod head is connected to the pushing end of the push rod, and the push rod head and the push rod can rotate relatively.
In the above scheme, the injection device further comprises a third elastic part for fixing the axial position of the medicine bottle, one end of the third elastic part is propped against the supporting sleeve, the other end of the third elastic part is propped against the push rod sleeve, and the push rod sleeve is pushed to axially compress the medicine bottle.
In the scheme, the upper end of the scale ring is fixedly provided with the upper cover, the upper cover is arranged above the injection force transmission sleeve, the bottom of the pressing cap is fixedly provided with the connecting shaft, the connecting shaft penetrates through the upper cover and is connected to the injection force transmission sleeve, the injection device further comprises a fourth elastic part for maintaining engagement of the third end face gear ring and the fourth end face gear ring, one end of the fourth elastic part abuts against the upper end of the injection force transmission sleeve, and the other end of the fourth elastic part abuts against the bottom end of the upper cover.
In the scheme, the injection device further comprises a limiting sleeve limiting the circumferential position of the push rod sleeve, the limiting sleeve is fixed at the injection end of the shell, the limiting sleeve is sleeved at the lower end of the push rod sleeve, ribs extending in the axial direction are arranged on the inner wall of the limiting sleeve, and an axial groove corresponding to the ribs is formed in the outer wall of one end of the push rod sleeve.
The injection device comprises a shell, a scale ring which is spirally lifted relative to the shell, an injection button for applying axial injection thrust, a push rod for pushing a piston of a medicine bottle to move, a transmission part for transmitting the injection thrust of the injection button to the push rod, a driving sleeve and a push rod sleeve, wherein the rotating ring is in linkage with the injection button in the circumferential direction, a first end face gear ring is arranged on one end face of the driving sleeve, which is opposite to the rotating ring, a second end face gear ring matched with the first end face gear ring is arranged on the lower end face of the rotating ring, the driving sleeve is in linkage with the push rod in the circumferential direction, the push rod sleeve is arranged on the push rod, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread.
Other beneficial effects of embodiments of the present invention will be further described in the detailed description with reference to the specific technical solutions.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is to be understood that the drawings described below are only a few of the embodiments of the present invention and that other drawings may be made from these drawings by one of ordinary skill in the art without the benefit of the present inventive effort.
FIG. 1 is a schematic view of an injection device according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of FIG. 1;
FIG. 3 is a schematic cross-sectional view of FIG. 1 (initial state);
FIG. 4 is a schematic cross-sectional view II (graduated state) of FIG. 1;
Fig. 5 is a schematic sectional view three of fig. 1 (injection completed state);
FIG. 6 is a schematic illustration of the cap, cartridge and vial of FIG. 3 removed;
FIG. 7 is a schematic view of an injection device in which a push rod, a support sleeve, a drive sleeve, a swivel ring and an injection force transmission sleeve are assembled together;
FIG. 8 is a schematic view of a dial ring in an injection device according to an embodiment of the present invention;
FIG. 9 is a schematic view of a push cap in an injection device according to an embodiment of the present invention;
FIG. 10 is a schematic view of an injection force transmission sleeve in an injection device according to an embodiment of the present invention;
FIG. 11 is a schematic view of an outer barrel of an injection device according to an embodiment of the present invention;
FIG. 12 is a schematic view of an inner barrel of an injection device according to an embodiment of the present invention;
FIG. 13 is a schematic view of a push rod sleeve in an injection device according to an embodiment of the present invention;
FIG. 14 is a schematic view of a cartridge of an injection device according to an embodiment of the present invention;
FIG. 15 is a schematic view of a vial in an injection device according to an embodiment of the present invention;
Fig. 16 is a schematic view of a protective cap in an injection device according to an embodiment of the present invention.
Detailed Description
An embodiment of the present invention provides an injection device including:
one end of the shell is an injection end connected with a medicine bottle, and the other end of the shell is an adjusting end for adjusting dosage;
The scale ring is positioned at the adjusting end of the shell, and the scale ring and the shell are provided with corresponding thread structures;
An injection button for applying an axial injection thrust; the injection button is positioned at the adjusting end of the shell, and the lower end of the injection button is connected with the upper end of the scale ring; the scale ring spirally descends along a first circumferential direction along with the axial injection thrust of the injection button, and the injection button spirally descends along with the spiral descending of the scale ring;
The push rod is positioned in the shell and extends along the axial direction of the shell, and comprises a pushing end connected with the medicine bottle and a stress end connected with the injection button, wherein the pushing end of the push rod extends out of the injection end of the shell;
the transmission part is used for transmitting the injection pushing force of the injection button to the push rod and comprises a rotary ring, a driving sleeve and a push rod sleeve;
The rotary ring is positioned below the injection button, and the rotary ring is linked with the injection button in the circumferential direction;
The driving sleeve is positioned below the rotary ring, a first end face gear ring is arranged on the end face of one end of the driving sleeve, which is opposite to the rotary ring, the first end face gear ring is a unidirectional end face gear ring which only transmits torque in the first circumferential direction and has triangular tooth shape, a second end face gear ring matched with the first end face gear ring is arranged on the lower end face of the rotary ring, and the driving sleeve rotates along with the rotation of the rotary ring in the first circumferential direction;
The push rod sleeve is arranged below the driving sleeve and is fixed in position, the push rod sleeve is arranged on the push rod in a sleeved mode, the push rod sleeve is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread.
Here, the vial refers to a vial containing a liquid drug, which is generally fixed in an injection device by a cartridge, and one end of the vial facing the injection device is provided with a piston connected to a push rod, and the other end may be connected to a needle.
Here, the circumferential linkage means that one side rotates and the other side necessarily rotates, and the circumferential linkage in the embodiment of the present invention is coaxial, so the rotation directions are also uniform.
Here, the tooth profiles of the first end face ring gear and the second end face ring gear are triangular, which has the advantage of higher precision, because the tooth profile of the triangular tooth profile is straight, the machining precision is easier to ensure than the normal involute tooth profile, and thus the precision of the transmission motion is easier to ensure.
The meshing motion between the first end face gear ring and the second end face gear ring in the embodiment of the invention is low-speed motion, so that involute tooth profile or other tooth profiles with high transmission efficiency and stable stress are not needed.
According to the injection device disclosed by the embodiment of the invention, the torque is transmitted through the end face gear ring with the triangular tooth shape, so that the torque can be precisely transmitted, and the injection dosage can be better controlled.
The working process of the embodiment of the invention comprises the steps of installing a medicine bottle, adjusting dosage, injecting and resetting, and the specific working principle is as follows:
1) The medicine bottle can be installed, namely the medicine bottle can be split, namely the medicine bottle is firstly loaded and then loaded, the medicine bottle is loaded, the injection is completed, the medicine bottle is discarded, the medicine bottle can be recycled, or the medicine bottle can be integrated, namely the medicine bottle and the medicine bottle are integrated, the medicine bottle can be directly loaded, the medicine bottle is directly discarded after the injection is completed, and the medicine bottle is disposable.
2) The dosage is regulated, the scale ring is rotated, the scale ring is spirally lifted relative to the shell, namely, the distance between the lower end of the scale ring and the shell in the lifting process is increased, the increased distance determines the moving distance of the pushing end of the subsequent push rod, and the dosage is determined. The set value of the dosage can be observed by arranging evenly distributed scales on the outer wall of the scale ring or the outer wall of the shell. Before the dose is not adjusted by the scale ring, the scale ring can only rise and cannot fall, and at this time, the scale is displayed as '0'.
3) The injection button is pressed, and the injection button is connected with the scale ring, so that axial thrust is applied to the scale ring, and the scale ring spirally descends along the first circumferential direction along with the axial injection thrust of the injection button. Also, since the injection button is connected with the scale ring, the injection button is spirally lowered along with the spiral lowering of the scale ring.
The swivel ring rotates due to the circumferential linkage of the swivel ring and the injection button. The rotary ring drives the driving sleeve to rotate through the first end face gear ring and the second end face gear ring. The driving sleeve is linked with the push rod in the circumferential direction, and the push rod also rotates. Because push rod and push rod cover pass through first internal thread and first external screw thread connection, and push rod cover axial position is fixed, consequently the push rod can spiral decline in the rotation, moves to the injection end of casing, extrudes the piston of medicine bottle promptly, accomplishes the injection.
Note that the push rod needs to be designed long enough to ensure that most of the vials on the market can be completely injected.
4) Resetting, and disassembling the medicine bin after the medicine in the medicine bottle is injected. The pushing end of the push rod is axially applied with force to push the push rod upwards, and the push rod sleeve are connected through the first internal thread and the first external thread, so that the push rod can be screwed up until the push rod returns to the initial position.
Note that if the drug in the drug vial is not completely injected, the drug cartridge cannot be disassembled, the axial position of the push rod cannot be retracted, otherwise, the accuracy of the dosage is affected.
The embodiments of the present invention are mainly used for injecting liquid medicines into diabetics or other patients, but those skilled in the art can understand that the embodiments can also be used for injecting or pushing other liquid or fluid products, and the description thereof will be omitted here.
In other embodiments of the present invention, a third end gear ring may be provided at the upper end of the scale ring, the third end gear ring is a unidirectional end gear ring that transmits only the torque in the second circumferential direction and has a triangular tooth shape, a fourth end gear ring that mates with the third end gear ring is provided at the lower end of the injection button, and when the scale ring rotates in the second circumferential direction, the injection button rotates along with the rotation of the scale ring.
Therefore, when dispensing, the scale ring rotates along the second circumferential direction, and the injection button is driven to rotate through the third end face gear ring and the fourth end face gear ring. The injection button rotates to drive the rotary ring to rotate. Because the first end face gear ring is a unidirectional end face gear ring which only transmits torque in the first circumferential direction, the rotary ring rotates in the second circumferential direction, the first end face gear ring does not rotate, and the second end face gear ring rotates to generate circumferential sliding with the first end face gear ring, which is similar to a ratchet wheel, so that clicking and clicking friction sounds can be generated, and a user can conveniently perceive the dispensing amount, and the novel rotary type rotary machine is a better implementation mode. It can be appreciated that it is also possible to dispense with the third and fourth end face gear rings, so that, when the dose is dispensed, only the dial ring rotates, the others do not rotate, except that the user cannot hear the click sound, and the use is not affected.
In other embodiments of the present invention, the rotary ring may include a first rotary ring, a second rotary ring and a third rotary ring which are nested in sequence in an axial direction and are axially telescopic with each other and are linked in a circumferential direction, the lower end face of the first rotary ring is provided with the second end face gear ring, the upper end of the third rotary ring is connected to the lower end of the injection button, and a first elastic part and a second elastic part which increase an axial total length are provided between the first rotary ring, the second rotary ring and the third rotary ring.
Here, through the design three revolving rings are nested axially and can mutually telescope, namely similar to telescopic pipe, can guarantee sufficient total length when dispensing volume, make the revolving rings contact injection button all the time, also can reduce total length when injecting, guarantee that scale ring and injection button descend in proper order, be the better implementation mode. It can be understood that only one rotary ring is required, only one structure is designed, the rotary ring always contacts the injection button, for example, a long key with longer axial length is arranged at the bottom of the injection button, a key slot into which the long key extends is arranged on the outer side wall of the rotary ring, the long key can axially move in the key slot during dispensing, but is not separated from the key slot, and the long key and the key slot can also enable the rotary ring and the injection button to be linked in the circumferential direction.
In other embodiments of the present invention, the injection button may include a pressing cap and an injection force transmission sleeve connected to each other, the injection force transmission sleeve and the pressing cap may rotate relatively, the injection force transmission sleeve has a lower end provided with the fourth end gear ring, and the injection force transmission sleeve is connected to an upper end of the third rotary ring. Therefore, when the scale ring drives the injection button to rotate, the pressing cap can not rotate, so that the axial force can be conveniently applied by a user, and the injection button is a better implementation mode. Of course, there are many ways to keep the pressing cap from rotating, which will not be described in detail.
In other embodiments of the present invention, the casing may include an outer cylinder and an inner cylinder fixed to each other, the outer cylinder and the inner cylinder are radially spaced by a predetermined gap, the scale ring is rotatably disposed between the outer cylinder and the inner cylinder, the inner wall of the scale ring is provided with a second internal thread, the outer circumference of the inner cylinder is provided with a second external thread matching the second internal thread, and the outer cylinder is provided with a reading window corresponding to the scale ring. Thus, the following beneficial effects can be produced:
Firstly, a scale ring is arranged between the outer cylinder and the inner cylinder, and the rotation of the scale ring is more stable;
secondly, the inner cylinder can surround parts such as a rotary ring, a driving sleeve and the like, so that the whole injection device has a more compact and firm structure;
Third, inner tube and urceolus can be assembled after making respectively, and wherein the urceolus can adopt the metal material, and the outward appearance is more beautiful, and the inner tube can adopt the plastics material, and the cost is lower.
Therefore, it is a more preferable embodiment. It is to be understood that the scale ring may be spirally lifted without being separated into the outer cylinder and the inner cylinder, for example, without providing the inner cylinder, by providing an internal thread on the inner wall of the outer cylinder and an external thread on the outer wall of the scale ring.
In other embodiments of the present invention, the injection device may further include a support sleeve supporting the transmission member, the support sleeve being sleeved on the push rod and located between the driving sleeve and the push rod sleeve, the upper end surface of the support sleeve being provided with a fifth end surface gear ring, the fifth end surface gear ring being a unidirectional end surface gear ring transmitting only the torque in the second circumferential direction and having a triangular tooth shape, the lower end surface of the driving sleeve being provided with a sixth end surface gear ring engaged with the fifth end surface gear ring, and the support sleeve being fixed to the housing. In this way, the axial position of the driving sleeve is relatively stable, and a more preferable embodiment is provided. In addition, in the injection, the fifth end face gear ring does not rotate, and the sixth end face gear ring rotates along with the driving sleeve, and can generate circumferential sliding with the first end face gear ring to generate clicking and clicking friction sounds, so that a user can conveniently perceive that the injection is a better implementation mode.
In other embodiments of the present invention, the injection device may further comprise a pusher head connected to the pushing end of the pusher, the pusher head and the pusher being rotatable relative to each other. In this way, the push rod is a preferable embodiment, in which friction force is not generated to rotate the piston of the medicine bottle when the push rod is spirally lowered.
In other embodiments of the present invention, the injection device may further comprise a third elastic member fixing an axial position of the medicine bottle, one end of the third elastic member abutting the support sleeve, the other end abutting the push rod sleeve, and pushing the push rod sleeve to press the medicine bottle from the axial direction. In this way, it is possible to cope with the length errors in manufacturing of different specifications of medicine bottles or medicine bottles of the same specification, and also to fix the axial position of the push rod sleeve, which is a preferable embodiment.
In other embodiments of the present invention, an upper cover may be fixed to the upper end of the scale ring, the upper cover is above the injection force transmission sleeve, a connecting shaft is fixed to the bottom of the pressing cap, the connecting shaft penetrates through the upper cover and is connected to the injection force transmission sleeve, and the injection device further comprises a fourth elastic part for maintaining engagement of the third end face gear ring and the fourth end face gear ring, wherein one end of the fourth elastic part abuts against the upper end of the injection force transmission sleeve, and the other end abuts against the bottom end of the upper cover. In this way, the third end face gear ring and the fourth end face gear ring can be tightly meshed all the time, and a more preferable embodiment is provided.
In other embodiments of the present invention, the injection device may further include a stop collar for limiting the circumferential position of the push rod sleeve, the stop collar being fixed to the injection end of the housing, the stop collar being disposed at the lower end of the push rod sleeve, an axially extending rib being disposed on an inner wall of the stop collar, and an axial groove corresponding to the rib being disposed on an outer wall of one end of the push rod sleeve. The circumferential position of the push rod sleeve is limited by the limiting sleeve instead of being directly limited by the shell, so that the manufacturing difficulty of the shell can be simplified, and the cost is reduced.
In general, the injection device of the embodiment of the invention has simpler structure, easier manufacture and more convenient assembly of each component and better control of injection dosage compared with the existing products.
The invention will be further described in detail with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. Also, the embodiments described below are only some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art, without any inventive effort, are within the scope of protection of the present invention.
For simplicity of description, the injection device and its components are described in terms of the orientation shown in fig. 1, i.e., above and below refer to both above and below in fig. 1.
As shown in fig. 1 to 7, an embodiment of the present invention provides an injection device including a housing, a dial ring 200, an injection button, a push rod 400, and a transmission member.
The dial ring 200 is used to indicate the dose to be injected. The scale ring 200 can be spirally lifted and lowered relative to the housing.
The injection button is used for applying axial injection thrust.
The push rod 400 is used for pushing the piston 7011 of the medicine bottle 701 to move.
The transmission member is used for transmitting the injection pushing force of the injection button to the push rod 400. The transfer member includes a swivel ring, a drive sleeve 504 and a push rod sleeve 505.
The rotary ring is linked with the injection button in the circumferential direction.
The end face of the driving sleeve 504 opposite to the rotary ring is provided with a first end face gear ring 5041. The first end face ring gear 5041 is a unidirectional end face ring gear having a triangular tooth shape for transmitting only the torque in the first circumferential direction. The lower end face of the rotary ring is provided with a second end face gear ring 5011 which is matched with the first end face gear ring 5041. The drive sleeve 504 rotates with rotation of the swivel ring in a first circumferential direction. The driving sleeve 504 is sleeved on the push rod 400, and the driving sleeve 504 is linked with the push rod 400 in the circumferential direction. In this embodiment, the first circumferential direction is counterclockwise, and the other direction, i.e., the second circumferential direction described below, is clockwise.
The position of the push rod sleeve 505 is fixed by a housing or other component. The push rod sleeve 505 is sleeved on the push rod 400, the push rod sleeve 505 is provided with a first internal thread 5051 (see fig. 13), and the push rod 400 is provided with a first external thread 401 matched with the first internal thread 5051.
Specifically, the tooth shape of the first end face gear ring 5041 is a right triangle, wherein the right-angle side is a side transmitting circumferential torque. Because of the mating relationship, the tooth form of the second end face ring gear 5011 is identical to the tooth form of the first end face ring gear 5041, as follows.
The first internal thread 5051 and the first external thread 401 are both driving threads, more specifically trapezoidal threads.
As shown in fig. 8, a third end gear ring 201 is disposed at the upper end of the scale ring 200, the third end gear ring 201 is a unidirectional end gear ring that only transmits torque in the second circumferential direction and has a triangular tooth shape, a fourth end gear ring 3021 that is matched with the third end gear ring 201 is disposed at the lower end of the injection button, and when the scale ring 200 rotates in the second circumferential direction, the injection button rotates along with the rotation of the scale ring 200. The tooth form of the third end face gear ring 201 is identical to the tooth form of the first end face gear ring 5041, but the direction of torque transfer is opposite.
The rotating rings comprise a first rotating ring 501, a second rotating ring 502 and a third rotating ring 503, wherein the first rotating ring 501, the second rotating ring 502 and the third rotating ring 503 are nested in sequence in the axial direction and can mutually stretch in the axial direction, and are linked in the circumferential direction. Specifically, the second rotating ring 502 is sleeved on the outer wall of the first rotating ring 501, and the third rotating ring 503 is sleeved on the outer wall of the second rotating ring 502. The lower end face of the first rotary ring 501 is provided with the second end face gear ring 5011, the upper end of the third rotary ring 503 is connected to the lower end of the injection button, and a first elastic part 506 and a second elastic part 507 for increasing the total axial length are arranged among the first rotary ring 501, the second rotary ring 502 and the third rotary ring 503.
Specifically, the circumferential interlocking of the first swing ring 501, the second swing ring 502, and the third swing ring 503 can be achieved by the fitting relationship of the key and the key groove.
Specifically, the first elastic element 506 and the second elastic element 507 are cylindrical compression springs.
As shown in fig. 9 and 10, the injection button includes a pressing cap 301 and an injection force transmission sleeve 302 that are connected to each other, the injection force transmission sleeve 302 and the pressing cap 301 can rotate relatively, the fourth end surface gear ring 3021 is disposed at the lower end of the injection force transmission sleeve 302, and the injection force transmission sleeve 302 is connected to the upper end of the third rotary ring 503.
As shown in fig. 11 and 12, the housing includes an outer cylinder 101 and an inner cylinder 102 fixed to each other, the outer cylinder 101 and the inner cylinder 102 are radially spaced by a preset gap, the scale ring 200 is rotatably disposed between the outer cylinder 101 and the inner cylinder 102, a second internal thread 202 is disposed on an inner wall of the scale ring 200, a second external thread 1021 matching with the second internal thread 202 is disposed on an outer circumference of the inner cylinder 102, and a reading window 1011 corresponding to the scale ring 200 is disposed on the outer cylinder.
The second internal thread 202 and the second external thread 1021 are both driving threads, more specifically trapezoidal threads.
The injection device further comprises a supporting sleeve 600 for supporting the transmission component, the supporting sleeve 600 is sleeved on the push rod 400 and is located between the driving sleeve 504 and the push rod sleeve 505, a fifth end face gear ring 601 is arranged on the upper end face of the supporting sleeve 600, the fifth end face gear ring 601 is a unidirectional end face gear ring which only transmits torque in the second circumferential direction and has a triangular tooth shape, a sixth end face gear ring 5043 matched with the fifth end face gear ring 601 is arranged on the lower end face of the driving sleeve 504, and the supporting sleeve 600 is fixed on the shell.
Specifically, the tooth form of the fifth end face ring gear 601 is identical to the tooth form of the first end face ring gear 5041.
Wherein, the injection device further comprises a push rod head 403, the push rod head 403 is connected to the pushing end of the push rod 400, and the push rod head 403 and the push rod 400 can rotate relatively.
Specifically, the pushing end of the pushing rod 400 is cylindrical or spherical, and the pushing rod head 403 is provided with a round hole matching with the cylindrical or spherical.
Wherein the injection device further comprises a third elastic part 5052 for fixing the axial position of the medicine bottle 701, one end of the third elastic part 5052 is abutted against the supporting sleeve 600, and the other end is abutted against the push rod sleeve 505, and the push rod sleeve 505 is pushed to axially press the medicine bottle 701. The third resilient member 5052 can fix not only the axial position of the vial 701 but also the axial position of the push rod sleeve 505.
Specifically, the third elastic component 5052 is a cylindrical compression spring. One end of the push rod sleeve 505 is provided with three sets of push rods 5053 extending toward the injection end of the housing, and the push rods 5053 are used to compress the drug vial 701, as shown in fig. 13.
The upper end of the scale ring 200 is fixed with an upper cover 204, the upper cover 204 is above the injection force transmission sleeve 302, the bottom of the pressing cap 301 is fixed with a connecting shaft, the connecting shaft penetrates through the upper cover and is connected to the injection force transmission sleeve 302, the injection device further comprises a fourth elastic part 203 for maintaining engagement of the third end face gear ring 201 and the fourth end face gear ring 3021, one end of the fourth elastic part 203 abuts against the upper end of the injection force transmission sleeve 302, and the other end abuts against the bottom end of the upper cover.
Specifically, the fourth elastic member 203 is a wave washer.
The injection device further comprises a limiting sleeve (not shown in the figure) for limiting the circumferential position of the push rod sleeve 505, the limiting sleeve is fixed at the injection end of the shell, the limiting sleeve is sleeved at the lower end of the push rod sleeve 505, the inner wall of the limiting sleeve is provided with axially extending ribs, and the outer wall of one end of the push rod sleeve 505 is provided with an axial groove 5055 corresponding to the ribs.
Wherein the injection device further comprises a fifth elastic part 3011 limiting the mutual positional relationship of the pressing cap 301 and the injection force transmission sleeve 302. The fifth elastic part 3011 is sleeved on a connecting shaft at the lower end of the pressing cap 301, the lower end of the fifth elastic part 3011 abuts against the upper end of the injection force transmission sleeve 302, specifically, the injection force transmission sleeve 302 is provided with a connecting hole matched with the connecting shaft, the pressing cap 301 extends into the connecting hole of the injection force transmission sleeve 302 through the connecting shaft, and circumferential flanges are respectively machined on the outer wall of the connecting shaft and the inner wall of the connecting hole so as to limit the axial positions of each other, but the fifth elastic part 3011 is not completely blocked in the axial direction for convenient disassembly, so that the fifth elastic part 3011 is required to be further limited through elastic force. Since both are plastic parts, the flange can be forced to break through the resistance of the flange by pressure during assembly.
The injection end of the shell is provided with a third external thread 1023 for installing a medicine bin 702, the medicine bin 702 is provided with a third internal thread 7021 matched with the third external thread 1023, the medicine bin 702 is used for installing a medicine bottle 701, and the medicine bin 702 and the medicine bottle 701 can be seen in fig. 14 and 15. Specifically, the drug cartridge 702 further includes fourth external threads 7022 disposed below the drug cartridge 702 for mounting a needle.
As shown in fig. 16, the housing further includes a protective cap 103 for protecting the medicine bottle 701 and the medicine compartment 702, and the protective cap 103 is provided with a hook 1031 for being inserted into a pocket.
The upper end of the scale ring 200 is further provided with knurling 205 for facilitating rotation of the scale ring 200. The outer wall of the dial ring 200 is provided with a scale 206 indicating the dosage.
According to the injection device, torque can be accurately transmitted through the end face gear ring with the triangular tooth shape, and injection dosage can be better controlled. Specifically, the control accuracy of the present embodiment can be up to 10. Mu.L.
In describing embodiments of the present invention, unless otherwise indicated and limited thereto, the term "coupled" should be construed broadly, for example, as electrical connection, communication between two elements, direct connection, or indirect connection via an intermediary, and the specific meaning of the term will be understood by those skilled in the art based on the specific circumstances.
The term "first\second\third" in the embodiments of the present invention is merely to distinguish similar objects, and does not represent a specific order for the objects, it being understood that the "first\second\third" may interchange a specific order or sequence, where allowed.
It should be appreciated that reference throughout this specification to "one embodiment" or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The above description is not intended to limit the scope of the invention, but is intended to cover any modifications, equivalents, and improvements within the spirit and principles of the invention.
Claims (10)
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|---|---|---|---|
| CN201911367980.8A CN113041455B (en) | 2019-12-26 | 2019-12-26 | Injection device |
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| CN201911367980.8A CN113041455B (en) | 2019-12-26 | 2019-12-26 | Injection device |
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| WO2006084876A1 (en) * | 2005-02-11 | 2006-08-17 | Novo Nordisk A/S | Injection device |
| EP2958611B1 (en) * | 2013-02-19 | 2018-04-11 | Novo Nordisk A/S | Rotary sensor module with axial switch |
| JP3213066U (en) * | 2016-07-21 | 2017-10-19 | 建森 翁 | Medical injection device |
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