A one-way locking mechanism for a portable infusion pump and methods of use thereof
By designing a one-way locking mechanism in a portable infusion pump, and utilizing the built-in cooperation between the key and the lock cylinder and the rotation limit structure, the problem of easy misoperation of the lock shaft is solved, achieving reliability and security in locking and unlocking, avoiding misoperation and detachment, and improving the safety and practicality of use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MEDSURE MEDICAL TECH CO LTD
- Filing Date
- 2024-07-18
- Publication Date
- 2026-08-04
AI Technical Summary
During use, the lock shaft of existing portable infusion pumps is easily touched or misoperated, leading to improper unlocking. In addition, the reservoir may fall off due to not being locked properly, posing a safety hazard.
A one-way locking mechanism was designed. By using the built-in cooperation between the key and the lock cylinder, and the synchronous movement of the lock cylinder and the lock shaft rotation limit structure and the elastic element, reliable locking and unlocking operations are achieved, preventing accidental activation and disengagement.
It effectively avoids accidental operation of the lock cylinder, ensures security and reliability in the locked state, prevents the key from falling out, and improves the safety and practicality of use.
Smart Images
Figure CN118911533B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of infusion pump technology, and in particular to a one-way locking mechanism for a portable infusion pump and its method of use. Background Technology
[0002] Portable infusion pumps are used for patients or postpartum women who experience pain from various causes and require continuous, intermittent, or timed infusions of medication. They can also be used for chemotherapy administration in cancer patients. Portable infusion pumps are used in conjunction with disposable reservoirs, and the route of administration is intravenous or epidural.
[0003] When assembling the reservoir with the infusion pump, the hook of the reservoir is inserted into the infusion pump. As the infusion pump and reservoir rotate closer, the hook engages with the locking hook inside the infusion pump. In current usage, the following situations are prone to occur: 1) The locking shaft, which is used with a key for unlocking, is exposed. Users or patients can easily accidentally touch the shaft, potentially causing it to rotate and resulting in misoperation, severely affecting the normal use of the infusion pump; 2) For ease of operation, a pre-locking spring is usually installed between the locking shaft and the locking hook to maintain compression. This allows the reservoir to be assembled even without rotating the shaft to the locked position, but due to the lack of locking, it may fall off due to external force during actual use, causing leakage; 3) Forgetting to lock, especially for unfamiliar users, can easily lead to medical accidents due to not locking the reservoir. Summary of the Invention
[0004] To address the aforementioned problems, this invention provides a reasonably structured one-way locking mechanism for portable infusion pumps and its usage method, thereby effectively preventing accidental touches or even misoperations of the lock cylinder. Furthermore, it effectively prevents the key from dislodging from the lock cylinder in the unlocked state, greatly facilitating practical use and demonstrating good practicality.
[0005] The technical solution adopted in this invention is as follows:
[0006] A one-way locking mechanism for a portable infusion pump includes a rotatably mounted reservoir and a drive pump. A baffle is installed on the top surface of the reservoir, extending upward to form a hook. A shaft bracket is installed at the lower part of the drive pump, and a locking hook is rotatably mounted on the shaft bracket. A locking shaft is mounted on the shaft bracket located on the side of the locking hook. The locking shaft can move axially at an upper limit relative to the shaft bracket, and a lock cylinder is rotatably mounted inside the locking shaft. The mechanism also includes a key. A through hole is formed on the locking shaft, and the lock cylinder is accommodated inside the locking shaft located inside the through hole. The head of the key passes through the through hole and is fitted into the lock groove of the lock cylinder. The key head drives the lock cylinder to rotate until the lock cylinder and the locking hook are engaged and locked. When unlocking, the head and the lock groove form an angle with the through hole.
[0007] As a further improvement to the above technical solution:
[0008] A protruding pin is radially inserted into the circumferential wall of the lock cylinder, and a sliding groove is provided on the lock shaft for the protruding pin to extend outward and slide relative to it. The angle of rotation of the lock cylinder relative to the lock shaft is limited by a rotation limiting structure. The fitting of the protruding pin and the sliding groove enables the lock shaft and the lock cylinder to move synchronously in the axial direction.
[0009] An elastic element is installed between the lock cylinder and the lock hook. The side of the shaft bracket is recessed to form groove one and groove two. The recess depth of groove one is less than that of groove two. When in the locked state, the convex pin is located in groove one and the elastic element is in a compressed state. When in the unlocked state, the convex pin is located in groove two and the elastic element is in a free state.
[0010] The locking shaft is formed into a small shaft segment and a large shaft segment by a stepped surface arranged along the circumference. A circular hole is provided on the shaft frame for the small shaft segment to be inserted and accommodated. The stepped surface and the protruding pin respectively constitute the limit for the axial movement of the locking shaft relative to the shaft frame. A protruding ridge is formed on the outer wall of the small shaft segment along the axial direction, and a long groove adapted to the protruding ridge is provided on the wall of the circular hole.
[0011] The elongated through hole, lock groove, and key head are all shaped to fit each other, each including a circular portion at the center, with elongated structures extending radially outward on both sides of the circular portion; a neck is provided between the elongated structure of the key head and the key handle, and the cross-sectional size of the neck is not greater than the cross-sectional size of the circular portion; when the key is fitted into the lock cylinder, the head is embedded in the lock groove, and the neck is located at the elongated through hole.
[0012] The lock cylinder is axially fitted into the lock shaft. One end of the lock cylinder has a protruding arm extending toward the lock hook, and the other end of the lock cylinder has a lock groove that matches the shape of the through hole.
[0013] The side of the lock hook facing the lock cylinder protrudes outward to form a contact surface, which abuts against the convex arm; the contact surface facing the rotation direction of the convex arm is set as an inclined surface.
[0014] The bottom end of the locking hook extends away from the contact surface to form a hook portion that matches the hook mounting, and the bottom surface of the hook portion is set as an inclined surface.
[0015] The drive pump and the liquid storage box are rotatably fitted at one end of their opposing surfaces via a rotating pin. After the opposing surfaces are in contact, they are fitted into a locking hook via a hook at the other end to achieve locking. A bracket is fitted on the bottom surface of the drive pump, and a shaft is installed inside the drive pump above the bracket. The upper end of the locking hook is rotatably installed on the shaft via a rotating shaft.
[0016] A method of using the one-way locking mechanism for a portable infusion pump, comprising a locking process and an unlocking process;
[0017] The locking process is as follows: When in the unlocked state, the elastic element is in its natural state, and the hook is pushed upward into the lock hook, forcing the lock hook to rotate relative to the shaft frame so that the hook is engaged; driven by the key, the lock cylinder and lock shaft move axially inward relative to the shaft frame, the elastic element turns into a compressed state, and at the same time the key is turned, the key head drives the lock cylinder to rotate, the lock cylinder and the lock hook abut against each other so that the lock hook cannot rotate relative to the shaft frame;
[0018] The unlocking process is as follows: Pass the key head through the long through hole of the lock shaft and install it into the lock cylinder groove. Turn the key, and the lock cylinder will rotate and release the contact state with the lock hook. The elastic element will change from compressed to open state. Under the weight of itself, the baffle and the liquid reservoir, the hook will act on the contact surface with the lock hook, causing the lock hook to rotate and unlock.
[0019] When the lock cylinder and the lock hook are in a locked state of contact, the key is removed from the lock cylinder via the lock shaft, and the elastic element is in a compressed state; when the lock cylinder is released from contact with the lock hook, the key head is limited by the long through hole of the lock shaft and cannot be removed, and the elastic element is in a free state.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] This invention achieves unlocking or locking operations by fitting a key with the lock cylinder groove inside the lock shaft. By embedding the lock cylinder inside, it effectively avoids accidental touches or even misoperations of the lock cylinder. Furthermore, it effectively prevents the key from falling out of the lock cylinder when unlocked, and also prevents forgetting to lock the lock. This greatly facilitates practical use, ensures safety, and is highly practical.
[0022] The present invention also includes the following advantages:
[0023] The lock cylinder and lock shaft are rotated and fitted together, and the engagement of the convex pin and the slide groove provides guidance for the rotation of the lock cylinder relative to the lock shaft and limits the rotation angle, effectively ensuring that the lock cylinder is rotated by the key and that the operation of switching between the locked and unlocked states is smooth and seamless.
[0024] By creating a long through hole on the lock shaft that matches the shape of the lock groove and the key head, the key head can smoothly pass through the lock shaft and be fitted into the built-in lock cylinder groove to achieve locking and unlocking switching operations. By setting the lock groove, key head, and long through hole as elongated structures, and setting a neck between the key head and the handle, after the head is inserted into the lock groove through the long through hole, as the key rotates, the lock groove, the key head and the long through hole form an angle, effectively preventing the key head from falling out of the lock groove for no reason.
[0025] In actual operation, whether unlocking or locking, it is necessary to apply axial force to the lock cylinder and lock shaft with the key to move axially, so that the convex pin is disengaged from groove one or groove two before the key can be turned. This effectively avoids accidental contact with the key or lock shaft that would cause it to turn.
[0026] The lock cylinder moves axially with the lock shaft relative to the shaft frame, so that the elastic element is in a natural state when unlocked, which facilitates the hook to be attached to or detached from the lock hook; while in the locked state, the elastic element is in a compressed state, which effectively ensures the structural reliability of the lock shaft relative to the shaft frame. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of the present invention.
[0028] Figure 2 This is an exploded view of the present invention.
[0029] Figure 3 This is a schematic diagram of the key structure of the present invention.
[0030] Figure 4 This is a schematic diagram of the assembly of the lock shaft and lock cylinder of the present invention.
[0031] Figure 5 This is a schematic diagram of the installation of the lock shaft and lock core on the shaft frame according to the present invention.
[0032] Figure 6 This is a schematic diagram of the state of the present invention before locking.
[0033] Figure 7 This is a schematic diagram of the present invention in the locked state.
[0034] The components include: 1. baffle; 2. bracket; 3. rotating shaft; 4. locking shaft; 5. key; 6. shaft bracket; 7. locking hook; 8. elastic element; 9. lock cylinder; 10. liquid storage box; 20. rotating pin; 30. drive pump;
[0035] 11. Hook;
[0036] 41. Slide groove; 42. Through hole; 43. Stepped surface; 44. Raised ridge;
[0037] 51. Head; 52. Neck; 53. Stalk;
[0038] 61. Long groove; 62. Blocking surface; 63. Groove one; 64. Groove two;
[0039] 71. Abutting surface; 72. Boss;
[0040] 90. Protruding pin; 91. Locking groove; 92. Protruding arm; 93. Countersunk hole. Detailed Implementation
[0041] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.
[0042] like Figure 1 and Figure 2As shown, this embodiment of a one-way locking mechanism for a portable infusion pump includes a rotatably mounted reservoir 10 and a drive pump 30. A baffle 1 is installed on the top surface of the reservoir 10, and the baffle 1 extends upward to form a hook 11. A shaft bracket 6 is installed at the lower part of the drive pump 30, and a locking hook 7 is rotatably mounted on the shaft bracket 6. A locking shaft 4 is installed on the shaft bracket 6 located on the side of the locking hook 7. The locking shaft 4 can move at an upper limit in the axial direction relative to the shaft bracket 6. A lock cylinder 9 is rotatably mounted inside the locking shaft 4. The mechanism also includes a key 5. A through hole 42 is opened on the locking shaft 4. The lock cylinder 9 is accommodated in the locking shaft 4 located inside the opening of the through hole 42. The head 51 of the key 5 passes through the through hole 42 and is fitted into the lock groove 91 of the lock cylinder 9. The head 51 of the key 5 drives the lock cylinder 9 to rotate until the lock cylinder 9 and the locking hook 7 reach each other and lock. When unlocking, the head 51 and the lock groove 91 are both at an angle to the through hole 42, effectively preventing the head 51 from coming out of the lock groove 91.
[0043] In this embodiment, the unlocking or locking operation is achieved by the matching of the key 5 with the lock cylinder 9 groove 91 inside the lock shaft 4. By embedding the lock cylinder 9, accidental touches or even misoperations of the lock cylinder 9 are effectively avoided, and the key 5 can be effectively prevented from falling out of the lock cylinder 9 in the unlocked state.
[0044] A protruding pin 90 is radially inserted on the circumferential wall of the lock cylinder 9. A groove 41 is provided on the lock shaft 4 for the protruding pin 90 to extend outward and slide relative to it. The rotation angle of the lock cylinder 9 relative to the lock shaft 4 is limited by the rotation limiting structure. The fitting of the protruding pin 90 and the groove 41 enables the lock shaft 4 and the lock cylinder 9 to move synchronously in the axial direction.
[0045] In this embodiment, the lock cylinder 9 is rotatably fitted with the lock shaft 4, and the fit between the protruding pin 90 and the sliding groove 41 provides a guiding effect for the rotation of the lock cylinder 9 relative to the lock shaft 4; furthermore, the fit between the protruding pin 90 and the sliding groove 41 allows the lock shaft 4 and the lock cylinder 9 to move synchronously in the axial direction while rotating relative to each other in the circumferential direction.
[0046] In this embodiment, the arc angle of the slide groove 41 is consistent with the angle at which the key 5 drives the lock cylinder 9 to rotate. The slide groove 41 restricts the rotation angle of the lock cylinder 9, effectively ensuring that the key 5 triggers the rotation of the lock cylinder and the operation of smoothly switching between the locked and unlocked states.
[0047] In this embodiment, the inner side of the shaft bracket 6 is concave, and a space for the pin 90 to rotate relative to each other is formed between the two blocking surfaces 62. The blocking surfaces 62 form a rotation limiting structure for the pin 90 and the lock core 9 to rotate relative to the shaft bracket 6.
[0048] A spring-loaded element 8 is installed between the lock cylinder 9 and the lock hook 7, such as... Figure 5As shown, the side of the shaft bracket 6 is recessed to form groove 1 63 and groove 2 64. The recess depth of groove 1 63 is less than the recess depth of groove 2 64. When in the locked state, the protruding pin 90 rotates with the lock cylinder 9 and is contained within groove 1 63, and the elastic element 8 is in the compressed state. When in the unlocked state, the protruding pin 90 rotates with the lock cylinder 9 and is contained within groove 2 64, and the elastic element 8 is in the unloaded state.
[0049] In this embodiment, groove 1 63 and groove 2 64 are located at the two blocking surfaces 62 respectively. When the protruding pin 90 rotates relative to the shaft frame 6 to the two blocking surfaces 62, the protruding pin 90 will be embedded into the corresponding groove 1 63 or groove 2 64 under the elastic action of the elastic member 8.
[0050] In actual operation, whether unlocking or locking, the key 5 needs to apply axial force to the lock cylinder 9 and the lock shaft 4 to move axially, so that the protruding pin 90 is disengaged from the groove 63 or the groove 64 before the key 5 can be turned. This effectively avoids accidental contact with the key 5 and the lock shaft 4, which would cause them to rotate.
[0051] In this embodiment, the inner depth of groove 63 is less than that of groove 64. Therefore, in the unlocked state, the protruding pin 90 can be fitted into the groove 64 with a larger depth, and the elastic member 8 has a larger axial space and can be extended in a natural state. In the locked state, the protruding pin 90 is fitted into the groove 63 with a smaller depth, and the elastic member 8 has a relatively smaller axial space and is in a compressed state. The elastic member 8 applies an elastic force to the lock cylinder 9 and the lock shaft 4 in the axial direction relative to the lock hook 7 and the shaft bracket 6.
[0052] The lock cylinder 9 moves axially with the lock shaft 4 relative to the shaft frame 6, so that the elastic element 8 is in a natural state when unlocked, which facilitates the attachment or detachment of the hook 11 relative to the lock hook 7; while in the locked state, the elastic element 8 is in a compressed state, which effectively ensures the structural reliability of the lock shaft 4 relative to the shaft frame 6; at the same time, the setting of the elastic element 8 gives the rotation of the lock hook 7 relative to the shaft frame 6 a flexible elastic buffer, ensuring and improving the user experience.
[0053] In this embodiment, a boss 72 can be formed on the side of the lock hook 7 for fitting one end of the elastic member 8, and a countersunk hole 93 can be formed on the end face of the lock cylinder 9 for accommodating the other end of the elastic member 8, thereby realizing the installation of the elastic member 8 between the lock hook 7 and the lock cylinder 9.
[0054] The locking shaft 4 is divided into a small shaft segment and a large shaft segment by stepped surfaces 43 arranged along the circumferential direction. A circular hole is provided on the shaft bracket 6 for the small shaft segment to be inserted and accommodated. The stepped surfaces 43 restrict the axial inward movement of the locking shaft 4 relative to the shaft bracket 6, while the protruding pin 90 restricts the axial outward movement of the locking shaft 4 relative to the shaft bracket 6. Thus, the stepped surfaces 43 and the protruding pin 90 respectively constitute limits for the axial movement of the locking shaft 4 relative to the shaft bracket 6. Figure 4 As shown, a protruding rib 44 extends axially on the outer wall of the small shaft segment, and a long groove 61 adapted to the protruding rib 44 is provided on the wall of the circular hole; thereby realizing reliable installation between the locking shaft 4 and the shaft bracket 6, which is convenient and stable to operate, and effectively prevents the locking shaft 4 from rotating relative to the shaft bracket 6.
[0055] In this embodiment, the installation of the locking shaft 4 on the shaft bracket 6 effectively realizes the internal mounting of the lock cylinder 9, which plays a protective role for the lock cylinder 9. In particular, during use, the rotational misalignment of the lock cylinder 9 relative to the locking shaft 4 prevents the key 5 from falling off.
[0056] In this embodiment, the locking shaft 4 not only enables the internal installation of the lock cylinder 9, but also guides and limits the rotation angle of the lock cylinder 9, effectively ensuring the reliability of unlocking and locking operations.
[0057] The shapes of the through hole 42, the lock groove 91, and the key head 51 are adapted, each including a circular portion at the center, with elongated structures extending radially outward on both sides of the circular portion; for example... Figure 3 As shown, a neck 52 is provided between the elongated structure of the head 51 of the key 5 and the handle 53 of the key 5. The cross-sectional dimension of the neck 52 is not greater than the cross-sectional dimension of the circular part. When the key 5 is installed in the lock cylinder 9, the head 51 is embedded in the lock groove 91, and the neck 52 is located at the elongated through hole 42.
[0058] In this embodiment, by opening an elongated through hole 42 on the lock shaft 4 that is adapted to the shape of the lock groove 91 and the key head 51, the key head 51 can smoothly pass through the lock shaft 4 and be fitted onto the built-in lock cylinder 9 lock groove 91 to realize the locking and unlocking switching operation; and by setting the key head 51 with a special structure, the risk of key misuse is effectively reduced.
[0059] In this embodiment, by setting the lock groove 91, the key head 51, and the long through hole 42 as elongated structures, and setting a neck 52 between the key head 51 and the handle 53, after the head 51 is inserted into the lock groove 91 through the long through hole 42, as the key 5 rotates, the lock groove 91, the key head 51, and the long through hole 42 form an angle, effectively preventing the key head 51 from falling out of the lock groove 91 without cause.
[0060] The lock cylinder 9 is axially fitted into the lock shaft 4. One edge of the lock cylinder 9 extends toward the lock hook 7 with a protruding arm 92, which abuts against the lock hook 7. The other end of the lock cylinder 9 is provided with a lock groove 91 that is consistent with the shape of the long through hole 42.
[0061] The side of the lock hook 7 facing the lock cylinder 9 protrudes outward to form an abutment surface 71, which abuts against the protruding arm 92 to lock the lock hook 7; the abutment surface 71 facing the rotation direction of the protruding arm 92 is set as an inclined surface to effectively ensure smooth contact between the protruding arm 92 and the abutment surface 71 during the rotation of the lock cylinder 9.
[0062] The bottom end of the locking hook 7 extends away from the abutment surface 71 to form a hook part that matches the hook 11 for hanging, and the bottom surface of the hook part is provided with an inclined surface.
[0063] In this embodiment, the abutting surface 71 and the hook portion are located on opposite sides of the locking hook 7, thereby effectively preventing the reverse rotation of the locking hook 7 through the abutting force received at the abutting surface 71, thus achieving and ensuring the reliability of locking.
[0064] The bottom surface of the hook is set as an inclined surface, which makes it convenient to apply a forced rotation force to the locking hook 7 through the inclined surface when the hook 11 is installed from bottom to top, so that the locking hook 7 rotates and the hook 11 is hung.
[0065] The drive pump 30 and the liquid storage box 10 are rotated and fitted at one end of their opposing surfaces via a rotating pin 20. After the opposing surfaces are in contact, they are fitted into the locking hook 7 via a hook 11 at the other end to achieve locking. The bottom surface of the drive pump 30 is fitted with a bracket 2, and the shaft bracket 6 is installed inside the drive pump 30 above the bracket 2. The upper end of the locking hook 7 is rotatably installed on the shaft bracket 6 via a rotating shaft 3.
[0066] The method of using the one-way locking mechanism for the portable infusion pump in this embodiment includes a locking process and an unlocking process. The locking process is the process of locking the reservoir 10 relative to the drive pump 30, and the unlocking process is the process of releasing the lock between the reservoir 10 and the drive pump 30.
[0067] The locking process is as follows:
[0068] When in the unlocked state, the elastic element 8 is in its natural state, and the protruding pin 90 is located at the groove 64 of the shaft bracket 6; the hook 11 is pushed upward into the locking hook 7, forcing the locking hook 7 to rotate relative to the shaft bracket 6 so that the hook 11 is engaged, as shown. Figure 6 As shown, at this time, the elastic element 8 is not under force, and the hook 11 can be relatively easily squeezed into the lock hook 7. After the hook 11 is attached to the lock hook 7, the lock hook 7 and the elastic element 8 are reset. The key 5 pushes axially inward, overcoming the axial elastic force of the elastic element 8, driving the lock cylinder 9 and the lock shaft 4 to move axially inward relative to the shaft frame 6. The elastic element 8 is axially compressed, and the protruding pin 90 disengages from the groove 64. At the same time, the key 5 is rotated, and the head 51 of the key 5 drives the lock cylinder 9 to rotate. The protruding arm 92 of the lock cylinder 9 abuts against the contact surface 71 of the lock hook 7, making it impossible for the lock hook 7 to rotate relative to the shaft frame 6. Figure 7As shown, the lock is reached and the protrusion 90 is driven to be accommodated in the groove 63 under the compression elastic force of the elastic element 8. At this time, the head 51 of the key 5 and the lock groove 91 of the lock cylinder 9 are directly opposite the long through hole 42 of the lock shaft 4, and the key 5 can be pulled out from the lock cylinder 9.
[0069] In this embodiment, during actual locking operations, if the hook 11 is not fully engaged in the lock hook 7, the lock hook 7 will not be able to reset, and when the key 5 is turned to lock, the lock cylinder 9 will not be able to rotate into place due to the protruding arm 92; only when the hook 11 is fully engaged in the lock hook 7 can the lock cylinder 9 rotate smoothly until the protruding arm 92 abuts against the contact surface 71 of the lock hook 7, and the key 5 can be turned to the preset position and pulled out from the lock cylinder 9; effectively ensuring reliable locking in actual use.
[0070] The unlocking process is as follows:
[0071] The head 51 of key 5 is passed through the long through hole 42 of lock shaft 4 and fitted into the lock groove 91 of lock cylinder 9. A slight axial force is applied to disengage the protruding pin 90 from the groove 63 of shaft bracket 6. Simultaneously, key 5 is rotated, causing lock cylinder 9 to rotate and protruding arm 92 to disengage from abutment surface 71, thereby releasing the abutment state between lock cylinder 9 and lock hook 7. Figure 6 As shown, the protruding pin 90 is housed in the groove 64 of the shaft bracket 6 under the action of the elastic element 8, and the elastic element 8 changes from compressed to its natural state; under the weight of itself, the baffle 1, and the liquid storage box 10, the hook 11 acts on the contact surface with the lock hook 7, causing the lock hook 7 to rotate and unlock; during the process of the hook 11 disengaging from the lock hook 7, an external force can also be applied to facilitate its disengagement, such as pulling down the liquid storage box 10. The external force combined with gravity helps to disengage and unlock.
[0072] When the lock cylinder 9 and the lock hook 7 are in a locked state of abutment, the head 51 of the key 5, the through hole 42 of the lock shaft 4, and the lock groove 91 of the lock cylinder 9 are aligned on the same straight line. The key 5 can be removed from the lock cylinder 9 via the lock shaft 4, and the elastic element 8 is in a compressed state.
[0073] When the lock cylinder 9 is released from the contact state with the lock hook 7, that is, when it is in the unlocked state, the head 51 of the key 5 inserted in the lock groove 91 of the lock cylinder 9 forms an angle with the long through hole 42 of the lock shaft 4 and is not directly opposite, so that the head 51 of the key 5 is limited by the long through hole 42 of the lock shaft 4 and cannot be removed from the lock cylinder 9, and the elastic element 8 is in the natural state.
[0074] This invention effectively avoids accidental touches or even misoperations of the lock cylinder by embedding it inside the lock cylinder. It also effectively prevents the key from falling out of the lock cylinder when the lock is unlocked, and also prevents forgetting to lock the lock. This greatly facilitates practical use, ensures security, and is highly practical.
[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0076] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.
Claims
1. A one-way locking mechanism for a portable infusion pump, comprising a rotatingly fitted liquid storage box (10) and a driving pump (30), a baffle (1) is installed on the top surface of the liquid storage box (10), the baffle (1) extends upward to form a hook (11), characterized in that: The drive pump (30) is equipped with a shaft bracket (6) at the lower part, and a lock hook (7) is rotatably mounted on the shaft bracket (6). A lock shaft (4) is mounted on the shaft bracket (6) located on the side of the lock hook (7). The lock shaft (4) moves at an upper limit in the axial direction relative to the shaft bracket (6). A lock cylinder (9) is rotatably mounted inside the lock shaft (4). The drive pump (30) also includes a key (5). A through hole (42) is opened on the lock shaft (4). The lock cylinder (9) is accommodated in the lock shaft (4) located inside the through hole (42). The head (51) of the key (5) passes through the through hole (42) and is fitted into the lock groove (91) of the lock cylinder (9). The key (5) drives the lock cylinder (9) to rotate through the head (51) until the lock cylinder (9) and the lock hook (7) reach each other to lock. When unlocking, the head (51) and the lock groove (91) are both at an angle to the through hole (42). The shapes of the through hole (42), the lock groove (91) and the head (51) of the key (5) are adapted, each including a circular part at the center, and the two sides of the circular part extend outward in a radial direction to form a strip-shaped structure; The lock cylinder (9) is axially fitted into the lock shaft (4). One end of the lock cylinder (9) has a protruding arm (92) extending toward the lock hook (7), which abuts against the lock hook (7). The other end of the lock cylinder (9) has a lock groove (91) with the same shape as the long through hole (42). The side of the lock hook (7) facing the lock cylinder (9) extends outward to form an abutment surface (71), which abuts against the convex arm (92) to lock the lock hook (7); the abutment surface (71) facing the rotation direction of the convex arm (92) is set as an inclined surface.
2. A one-way locking mechanism for a portable infusion pump as defined in claim 1, wherein: The lock cylinder (9) has a protruding pin (90) inserted radially on its circumferential wall surface. The lock shaft (4) has a groove (41) for the protruding pin (90) to extend outward and slide relative to it. The rotation angle of the lock cylinder (9) relative to the lock shaft (4) is limited by the rotation limiting structure. The fitting of the protruding pin (90) and the groove (41) makes the lock shaft (4) and the lock cylinder (9) move synchronously in the axial direction.
3. A one-way locking mechanism for a portable infusion pump as defined in claim 2, wherein: An elastic element (8) is installed between the lock cylinder (9) and the lock hook (7). The side of the shaft bracket (6) is recessed to form a first groove (63) and a second groove (64). The recessed depth of the first groove (63) is less than the recessed depth of the second groove (64). When in the locked state, the convex pin (90) is located in the first groove (63) and the elastic element (8) is in the compressed state. When in the unlocked state, the convex pin (90) is located in the second groove (64) and the elastic element (8) is in the unloaded state.
4. A one-way locking mechanism for a portable infusion pump as defined in claim 2, wherein: The locking shaft (4) is formed by a stepped surface (43) arranged along the circumferential direction to form a small shaft segment and a large shaft segment. The shaft frame (6) is provided with a round hole for the small shaft segment to be inserted and accommodated. The stepped surface (43) and the protruding pin (90) respectively constitute the limit for the axial movement of the locking shaft (4) relative to the shaft frame (6). The outer wall of the small shaft segment extends axially to form a protruding ridge (44), and the wall of the round hole is provided with a long groove (61) that matches the protruding ridge (44).
5. A one-way locking mechanism for a portable infusion pump as defined in claim 1, wherein: A neck (52) is provided between the elongated structure of the head (51) of the key (5) and the handle (53) of the key (5). The cross-sectional dimension of the neck (52) is not greater than the cross-sectional dimension of the circular part. When the key (5) is fitted into the lock cylinder (9), the head (51) is embedded in the lock groove (91), and the neck (52) is located at the long through hole (42).
6. A one-way locking mechanism for a portable infusion pump as defined in claim 1, wherein: The bottom end of the locking hook (7) extends away from the abutment surface (71) to form a hook part that matches the hook (11) for hanging, and the bottom surface of the hook part is set as an inclined surface.
7. A one-way locking mechanism for a portable infusion pump as defined in claim 1, wherein: The drive pump (30) and the liquid storage box (10) are rotated and fitted at one end of their facing surfaces via a rotating pin (20). After the facing surfaces are in contact, they are fitted into the locking hook (7) via a hook (11) at the other end to achieve locking. The bottom surface of the drive pump (30) is fitted with a bracket (2), and the shaft frame (6) is installed inside the drive pump (30) above the bracket (2). The upper end of the locking hook (7) is rotatably installed on the shaft frame (6) via a rotating shaft (3).
8. A method of using the one-way locking mechanism for a portable infusion pump of claim 3, characterized by: Includes the locking and unlocking processes; The locking process is as follows: When in the unlocked state, the elastic element (8) is in the natural state, and the hook (11) is pushed upward into the lock hook (7), forcing the lock hook (7) to rotate relative to the shaft frame (6) so that the hook (11) is engaged; the key (5) drives the lock cylinder (9) and the lock shaft (4) to move axially inward relative to the shaft frame (6), the elastic element (8) turns into the compressed state, and at the same time the key (5) is rotated, the head (51) of the key (5) drives the lock cylinder (9) to rotate, the lock cylinder (9) and the lock hook (7) abut against each other so that the lock hook (7) cannot rotate relative to the shaft frame (6); The unlocking process is as follows: the head (51) of the key (5) is passed through the long through hole (42) of the lock shaft (4) and fitted into the lock groove (91) of the lock cylinder (9). The key (5) is rotated, and the lock cylinder (9) rotates to release the contact state with the lock hook (7). The elastic element (8) changes from compressed to natural state. Under the weight of itself, the baffle (1), and the liquid storage box (10), the hook (11) acts on the contact surface of the lock hook (7), causing the lock hook (7) to rotate and unlock. When the lock cylinder (9) and the lock hook (7) are in a locked state of abutting each other, the key (5) is removed from the lock cylinder (9) via the lock shaft (4), and the elastic element (8) is in a compressed state; when the lock cylinder (9) is released from the abutting state with the lock hook (7), the head (51) of the key (5) is limited by the long through hole (42) of the lock shaft (4) and cannot be removed, and the elastic element (8) is in a natural state.