Spiral medicine storage mechanism and patch type injection pump

Abstract

The invention discloses a spiral medicine storage mechanism and a patch type injection pump, and the medicine storage mechanism comprises a medicine storage part which is provided with a spiral liquid medicine cavity; the driving part is provided with a driving rod and a piston, the piston is arranged in the liquid medicine cavity, and the piston is driven by the driving rod to move along the spiral wall surface of the liquid medicine cavity. The liquid medicine cavity is arranged to be spiral, the space arrangement limitation of a horizontal circumferential plane is broken through, the liquid medicine cavity is expanded in the vertical direction, the space in the vertical direction is reasonably and effectively utilized, the path for expanding the liquid storage amount is increased, and even if the patch pump is arranged to be small and compact, the requirement for the large liquid storage amount can be met; the size of a smaller and more optimized patch pump is achieved, the wearing comfort of a patient is improved, and meanwhile the requirements for various liquid storage amounts are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drug infusion, in particular to a spiral type drug storage mechanism and a patch type injection pump. BACKGROUND

[0002] The patch pump is an integrated device for infusing drugs, which combines most or all structures such as a fluid reservoir, a pumping mechanism and a mechanism for automatically inserting a cannula in a cylinder body that is adhesively attached to an infusion site on the skin of a patient, saving the use of a separate infusion or tubing.

[0003] The conventional patch pump usually adopts a plunger pump principle, in which a driving mechanism applies force to a plunger through a push rod in a linear motion form, so that the plunger moves linearly to dispense the drug out of a drug chamber. The patch pump adopting the plunger pump principle has a relatively large axial volume of the reservoir, which makes the patient feel uncomfortable when wearing it.

[0004] In order to reduce the size of the injection pump, there is also a scheme of adopting an arc-shaped drug storage mechanism, which changes the straight type of the liquid storage cylinder to an arc shape, so that the axial size of the liquid storage cylinder can be smaller under the premise of the same liquid storage capacity. For example, the injection pump disclosed in the patent application file with the publication number CN103313741A adopts an arc-shaped liquid storage cylinder in the shape of a ring-shaped tube segment, and a driving component drives the piston to move in the arc-shaped liquid storage cylinder. At present, the drug storage mechanism with the arc-shaped cylinder all adopts a horizontal type of arc-shaped cylinder, i.e. the circumferential axis of the arc-shaped cylinder is located on the same horizontal plane. The horizontal type of arc-shaped drug storage mechanism controls the arrangement of the arc-shaped cavity to extend in the horizontal plane. Considering the need to reserve sufficient movement space for the driving component in the circumferential direction of the same plane as the arc-shaped cylinder, the maximum arc of the arc-shaped cylinder can only be 180°, and mostly less than 180°. Limited by the arrangement space of the arc-shaped cylinder, when the liquid storage capacity requirement is large, even if the arc-shaped cylinder is set to the limit of 180°, it cannot meet the requirement of the liquid storage capacity. Therefore, the arc-shaped cylinder can only seek to expand the radial size to expand the liquid storage capacity, which will cause the increase of the radial size of the pump body. The increase of the radial size will reduce the advantage of the reduction of the axial size of the arc-shaped cylinder, resulting in that the patch pump cannot obtain the desired optimized size, and the patient still feels uncomfortable when wearing it. SUMMARY

[0005] In view of the above-mentioned shortcomings of the horizontal type of arc-shaped drug storage mechanism limited by the horizontal circumferential arrangement space, the present applicant provides a spiral type drug storage mechanism and a patch type injection pump with a reasonable structure, which sets a spiral type of liquid chamber, reasonably utilizes the vertical space, and makes the patch pump smaller and more optimized while meeting the requirements of various drug storage capacities.

[0006] The technical solutions adopted by the present application are as follows: A spiral medicine storage mechanism comprises a medicine storage component with a spiral medicine liquid cavity; a driving component with a driving rod and a piston, the piston being arranged in the medicine liquid cavity and being driven by the driving rod to move along the spiral wall surface of the medicine liquid cavity.

[0007] As a further improvement of the above technical solution: The driving rod is arranged on the spiral track of the medicine liquid cavity and moves along the spiral track.

[0008] The driving rod is a spiral rod, the pitch of the driving rod matches the pitch of the medicine liquid cavity; the medicine liquid cavity is located at the upper part of the spiral track, the driving component is located at the lower part of the spiral track, and the driving component pushes the medicine liquid from bottom to top; or the medicine liquid cavity is located at the lower part of the spiral track, and the driving component is located at the upper part of the spiral track, and the driving component pushes the medicine liquid from top to bottom.

[0009] The medicine storage component is provided with a spiral medicine liquid cylinder, one end of the medicine liquid cylinder is open, and the other end is closed, the closed end is provided with a liquid outlet, and the medicine liquid cavity is defined by the spiral peripheral surface of the medicine liquid cylinder and the closed end surface.

[0010] The high position of the medicine liquid cylinder is provided with a surrounding plate extending downward.

[0011] The range of the arc of the spiral arc of the medicine liquid cylinder is 30°-360°, and the length of the spiral arc of the driving rod is greater than the length of the spiral arc of the medicine liquid cylinder.

[0012] The medicine storage component and the driving component are respectively provided with sleeves, the central axes of the sleeves are coaxial with the spiral central axis, the sleeve of the medicine storage component is inserted into the inner side of the supporting cylinder, and the sleeve of the driving component is sleeved on the outer side of the supporting cylinder.

[0013] The inner wall of the sleeve is provided with threads, the outer wall of the supporting cylinder is provided with a threaded groove, and the threads are matched with the threaded groove; the pitches of the threads and the threaded groove match the pitch of the driving rod.

[0014] The driving rod is provided with a transmission structure, and the transmission structure is a gear tooth; the rod part of the driving rod is provided with a reinforcing part.

[0015] A patch type injection pump is provided with a spiral medicine storage mechanism and a driving mechanism on the base, the driving component of the medicine storage mechanism is connected with the driving mechanism and is driven to make spiral movement by the driving mechanism; the medicine storage mechanism is provided with a button assembly and a medicine injection assembly, and the medicine injection assembly communicates with the medicine liquid cavity of the medicine storage mechanism.

[0016] The beneficial effects of the present application are as follows: The medicine liquid cavity is arranged in a spiral mode, which breaks through the limitation of horizontal circumferential plane space arrangement, expands the medicine liquid cavity in the vertical direction, rationally and effectively utilizes the space in the vertical direction, increases the path of expanded liquid storage capacity, and meets the requirement of large liquid storage capacity even if the patch pump is arranged to be small and compact, realizes smaller and more optimized patch pump size, improves patient wearing comfort, and guarantees various liquid storage capacity requirements. The medicine liquid cylinder expands the cavity space in the vertical direction through the spiral arrangement mode, breaks through the limitation of space on size, and ensures that the driving component has sufficient movement space even if the arc length is expanded to more than half a circle or even a whole circle without changing the radial size. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the present application.

[0018] Figure 2 It is a sectional view of the present application.

[0019] Figure 3 It is an exploded view of the present application.

[0020] Figure 4 It is a sectional view before injection of the present application, and (b) is an enlarged view of A in (a).

[0021] Figure 5 It is a sectional view during injection of the present application, and (b) is an enlarged view of B in (a).

[0022] Figure 6 It is a sectional view after injection of the present application, and (b) is an enlarged view of C in (a).

[0023] Figure 7 It is a front view of one embodiment of the medicine storage mechanism of the present application, (a) is a state before injection, (b) is a state during injection, and (c) is a state after injection.

[0024] Figure 8 It is a perspective view of the medicine storage component, (a) and (b) are two different viewing angles.

[0025] Figure 9 It is a perspective view of the driving component.

[0026] Figure 10 It is a structural schematic view of the driving mechanism, (a) is a perspective view, and (b) is a sectional view.

[0027] Figure 11 It is an exploded view of the base and the clutch assembly.

[0028] Figure 12 It is a perspective view of the transmission wheel.

[0029] Figure 13For injection, the cooperation of the liquid storage chamber, the driving component, the button assembly and the support is shown in (a), the cooperation of the button assembly and the support is shown in (b) and (c).

[0030] Figure 14 For injection, the cooperation of the liquid storage chamber, the driving component, the button assembly and the support is shown in (a), the cooperation of the button assembly and the support is shown in (b) and (c).

[0031] Figure 15 For injection, the cooperation of the liquid storage chamber, the driving component, the button assembly and the support is shown in (a), the cooperation of the button assembly and the support is shown in (b) and (c).

[0032] Figure 16 For injection, the cooperation of the liquid storage chamber, the driving component, the button assembly and the support is shown in (a), the cooperation of the button assembly and the support is shown in (b) and (c).

[0033] Figure 17 For injection, the cooperation of the liquid storage chamber, the driving component, the button assembly and the support is shown in (a), the cooperation of the button assembly and the support is shown in (b) and (c).

[0034] Figure 18 For injection, the cooperation of the liquid storage chamber, the driving component, the button assembly and the support is shown in (a), the cooperation of the button assembly and the support is shown in (b) and (c).

[0035] In the figure: 100, injection pump; 1, medicine storage mechanism; 11, medicine storage component; 110, liquid chamber; 111, liquid cylinder; 1111, sealing plate; 1112, liquid outlet; 1113, connecting block; 112, sleeve one; 1121, bottom wall; 1122, plug-in hole; 1123, guide column; 1124, displacement opening; 113, surrounding plate; 12, driving component; 121, driving rod; 1211, gear one; 1212, reinforcing part; 122, sleeve two; 1221, thread; 1222, protruding block; 123, connecting rod; 124, piston; 125, sealing part; 2, driving mechanism; 21, knob; 211, gear two; 212, protruding ring; 22, motor; 221, support; 222, switch assembly; 23, driving wheel; 24, transmission wheel; 241, wheel part one; 242, wheel part two; 243, wheel part three; 25, rotating shaft; 26, coil spring; 27, limiter; 271, insertion hole; 272, clamping hole; 273, gear three; 28, clamping block; 281, protruding table one; 282, clamping column; 283, sliding block; 29, spring one; 3, base; 31, support plate; 32, outer cylinder; 321, ring groove; 322, step; 323, vertical groove; 33, inner cylinder; 331, thread groove; 34, support column; 35, sleeve three; 36, sleeve four; 361, limiting sliding groove; 4. Bracket; 41. Support sleeve; 42. Support arm; 421. Support platform; 43. Second boss; 44. Insertion hole; 45. Guide hole; 46. First slide groove; 47. Second slide groove; 471. Progress groove section; 472. Return groove section; 473. Transition section; 474. First limiting part; 475. Second limiting part; 5. Button assembly; 51. Button; 511. Snap-fit; 512. Raised strip; 513. Pressure arm; 52. Press cover; 53. Push block; 531. Sleeve; 532. Sliding column; 533. Push plate; 54. Spring II; 6. Injection assembly; 61. Connector; 62. Injection needle; 621. Horizontal section; 622. Arc section; 623. Vertical section; 624. Circular arc; 63. Connecting tube; 64. Protective head; 65. Sealing plug; 66. Adapter cap; 7. Top cover; 71. Liquid filling port; 8. Bottom cover; 81. Snap fastener; 82. Vertical strip; 9. Adhesive layer. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0037] This invention provides a spiral-type drug storage mechanism and a patch-type infusion pump. The purpose is to set the drug liquid chamber 110 and the driving component 12 in a spiral shape, which breaks through the spatial arrangement limitations of the horizontal circumferential plane. The drug liquid chamber 110 and the driving component 12 are extended in the vertical direction, making reasonable and effective use of the vertical space and increasing the path for expanding the liquid storage volume. Even if the patch pump is set to be very small and compact, it can still meet the requirements of large liquid storage volume. While achieving a smaller and more optimized patch pump size and improving patient wearing comfort, it ensures the requirements of various liquid storage volumes.

[0038] like Figures 1 to 6 As shown, the infusion pump 100 includes a drug storage mechanism 1, a drive mechanism 2, a base 3, a bracket 4, a button assembly 5, an injection assembly 6, a top cover 7, a bottom cover 8, and an adhesive layer 9. The drug storage mechanism 1 and the drive mechanism 2 are mounted on the base 3. The movable part of the drug storage mechanism 1 is connected to the drive mechanism 2, and the drive mechanism 2 drives the movable part of the drug storage mechanism 1 to move spirally. The bracket 4 is inserted into the center of the drug storage mechanism 1. The button assembly 5 and the injection assembly 6 are mounted on the bracket 4 and supported by the bracket 4. The injection assembly 6 connects to the drug liquid chamber 110 of the drug storage mechanism 1. The top cover 7 is located on top of the injection assembly 6, providing protection for the injection assembly 6. The top cover 7 has a liquid filling port 71, through which the injection port of the injection assembly 6 protrudes. The bottom cover 8 is fitted over the base 3, protecting the base 3 and providing assistance during drug filling. The adhesive layer 9 is located on the bottom surface of the base 3 and is used to adhere the infusion pump 100 to the skin during injection.

[0039] likeFigures 2 to 9 As shown, the medicine storage mechanism 1 comprises a medicine storage part 11 and a driving part 12, the medicine storage part 11 is provided with a spiral medicine liquid cavity 110, and the driving part 12 is arranged on the spiral track of the medicine liquid cavity 110, and the driving part 12 moves along the spiral track to dispense the medicine liquid out of the medicine liquid cavity 110. Figure 3 、 Figures 4 to 7 As shown, in one embodiment, the medicine liquid cavity 110 of the medicine storage part 11 is arranged above and below the driving part 12, the medicine liquid cavity 110 is arranged at the upper part of the spiral track, the driving part 12 is arranged at the lower part of the spiral track, and the driving part 12 pushes the medicine liquid out of the medicine liquid cavity 110 from bottom to top. Arranging the medicine liquid cavity 110 at the upper part and pushing the medicine liquid from bottom to top: on the one hand, it is convenient to observe the medicine liquid in the cavity; on the other hand, since the gas generally gathers at the high place, it is also beneficial to exhaust and improve the precision of injection. As shown, Figure 18 In another embodiment, the medicine liquid cavity 110 of the medicine storage part 11 can also be arranged below the driving part 12, i.e. the medicine liquid cavity 110 is arranged at the lower part of the spiral track, and the driving part 12 is arranged at the upper part of the spiral track, and the driving part 12 pushes the medicine liquid out of the medicine liquid cavity 110 from top to bottom. Arranging the medicine liquid cavity 110 at the lower part and pushing the medicine liquid from top to bottom: the gravity can be used to output the medicine liquid downward when the medicine liquid is transported, which is beneficial to the smooth transportation of the medicine liquid.

[0040] As shown, Figure 2 、 Figure 8As shown, the medicine storage part 11 includes a spiral medicine liquid cylinder 111, a sleeve I 112 vertically arranged at the center of the medicine liquid cylinder 111, and a surrounding plate 113, the central axis of the sleeve I 112 is coaxial with the spiral central axis of the medicine liquid cylinder 111, the inner side wall surface of the medicine liquid cylinder 111 is fixedly connected with the circumferential wall surface of the sleeve I 112 through a connecting plate, the surrounding plate 113 is connected to the outer cylinder wall at the high position of the medicine liquid cylinder 111 and extends downward, the high position of the medicine liquid cylinder 111 is provided with the surrounding plate 113, so that the high position of the medicine liquid cylinder 111 can overlap with the knob 21 through the surrounding plate 113, on the one hand, it can ensure the sealing of the internal parts of the pump, on the other hand, the knob 21 can provide limiting and supporting for the high position of the medicine liquid cylinder 111 through the surrounding plate 113, and ensure the installation precision of the medicine liquid cylinder 111. One end of the medicine liquid cylinder 111 is open, and the other end is sealed with a sealing plate 1111, the cavity defined by the spiral circumferential surface of the medicine liquid cylinder 111 and the sealing plate 1111 is a spiral medicine liquid cavity 110, the radian of the spiral arc of the medicine liquid cylinder 111 is selected in the range of 30°-360°, and the preferred range is 90°-300°; the medicine liquid cylinder 111 expands the cavity space in the vertical direction through the spiral arrangement, breaks through the limitation of space on size, so that the arc length of the medicine liquid cylinder 111 can be expanded to more than half a circle or even a whole circle under the condition that the radial dimension is unchanged, and enough movement space of the driving part 12 can be ensured. The sealing plate 1111 of the medicine liquid cylinder 111 is provided with a liquid outlet 1112 communicating with the medicine liquid cavity 110, and a connecting block 1113 connected with the upper cover 7 is further arranged on the sealing plate 1111. The sleeve I 112 is a cylinder with a bottom wall 1121, the bottom wall 1121 is provided with an insertion hole 1122 at the center, and a guide column 1123 is arranged upwardly on the upper surface of the bottom wall 1121; the circumferential wall surface of the sleeve I 112 is provided with a giving opening 1124 for giving space to the moving part of the button assembly 5.

[0041] As Figure 2 , Figure 9As shown, the driving component 12 comprises a helical driving rod 121, a sleeve two 122 vertically arranged at the center of the driving rod 121, a connecting rod 123, and a piston 124. The central axis of the sleeve two 122 is coaxial with the helical central axis of the driving rod 121. One end of the driving rod 121 is connected to the wall surface of the sleeve two 122 through the connecting rod 123, and the other end of the driving rod 121 is connected to the piston 124. The pitch of the driving rod 121 matches the pitch of the liquid chamber 110 and the liquid cylinder 111, and the helical arc length of the driving rod 121 is greater than the helical arc length of the liquid cylinder 111. The piston 124 is horizontally arranged in the liquid chamber 110 and can be driven by the driving rod 121 to move along the helical inner wall of the liquid chamber 110. In this embodiment, a sealing element 125 is sleeved on the outer periphery of the piston 124 to seal the gap between the piston 124 and the liquid cylinder 111. In other embodiments, the piston 124 can be a rubber plug, and the sealing can be achieved by the deformation of the peripheral surface of the rubber plug. The inner helical surface of the driving rod 121 is provided with a plurality of gear teeth one 1211 for meshing transmission with the corresponding gear. The rod part of the driving rod 121 is embedded with a reinforcing element 1212 to increase the strength of the driving rod 121. The inner wall surface of the sleeve two 122 is provided with threads 1221, and the top surface of the sleeve two 122 is provided with protrusions 1222 extending axially upward and downward. The functions of the threads 1221 and the protrusions 1222 will be further described below.

[0042] As shown in Figures 2 to 6 , Figure 10 , Figure 11 , the driving mechanism 2 comprises a knob 21, a motor 22, a driving wheel 23, a transmission wheel 24, a rotating shaft 25, and a clutch assembly. The clutch assembly comprises a coil spring 26, a limiter 27, a clamping block 28, and a spring one 29. The inner periphery of the knob 21 is provided with a plurality of gear teeth two 211, and the outer periphery of the knob 21 is provided with a convex ring 212. The motor 22 is fixed on a support 221, the driving wheel 23 is sleeved on the driving shaft of the motor 22, and the support 221 is provided with a switch assembly 222 for controlling the motor 22. The rotating shaft 25 is connected to the support 221, the transmission wheel 24 and the clutch assembly are sleeved on the rotating shaft 25, and the clutch assembly is located below the transmission wheel 24. A circumferential limiting structure is provided between the transmission wheel 24 and the rotating shaft 25. The transmission wheel 24 can move up and down in the vertical direction relative to the rotating shaft 25, but cannot rotate independently relative to the rotating shaft 25. The transmission wheel 24 has an upper stop position disengaged from the clutch assembly and a lower stop position engaged with the clutch assembly. As shown in Figure 12 , the transmission wheel 24 is sequentially provided with a wheel part one 241, a wheel part two 242, and a wheel part three 243 from top to bottom. The pitch diameter and the number of teeth of the wheel part two 242 are greater than those of the wheel part one 241 and the wheel part three 243. As shown in Figures 4 to 6As shown, wheel part one 241 is in transmission cooperation with gear teeth one 1211 of driving part 12, wheel part two 242 is in transmission cooperation with gear teeth two 211 of driving wheel 23 and knob 21 respectively, and wheel part three 243 is in transmission cooperation with clutch assembly. As shown in Figure 10 、 Figure 11 As shown, coil spring 26, limiter 27 and clamping block 28 of clutch assembly are sequentially sleeved on rotating shaft 25 from outside to inside, spring one 29 is sleeved on rotating shaft 25 and located at lower part of clamping block 28, and spring one 29 presses clamping block 28 against limiter 27. As shown in Figure 11 As shown, top wall of limiter 27 is provided with insertion hole 271 and a plurality of clamping holes 272, and inner wall surface of insertion hole 271 is provided with a plurality of gear teeth three 273. Clamping block 28 is provided with boss one 281 and a plurality of clamping columns 282. As shown in Figures 4 to 6 、 Figure 10 As shown, boss one 281 and clamping columns 282 of clamping block 28 and wheel part three 243 of transmission wheel 24 are in cooperation with insertion hole 271 and clamping holes 272 of limiter 27 respectively; as shown in Figure 4 、 Figure 6 、 Figure 10 As shown, before or after injection, boss one 281 and clamping columns 282 of clamping block 28 are inserted into insertion hole 271 and clamping holes 272 of limiter 27 respectively, and coil spring 26 is limited from rotating; as shown in Figure 5 As shown, during injection, transmission wheel 24 moves downward and pushes clamping block 28 out of limiter 27, wheel part three 243 of transmission wheel 24 is inserted into insertion hole 271 of limiter 27 and engaged with gear teeth three 273 for transmission. A plurality of sliding blocks 283 are provided on clamping block 28 and extend radially.

[0043] As shown in Figure 2 、 Figure 11 As shown, base 3 includes support plate 31 at bottom, outer cylinder 32 and inner cylinder 33 extending upward from support plate 31, a plurality of support columns 34, sleeve three 35 and sleeve four 36. Central through hole for penetrating injection assembly 6 is formed in the center of support plate 31, annular groove 321 is formed in inner circumferential surface of outer cylinder 32, step 322 and a plurality of vertical grooves 323 are provided on outer circumferential surface of outer cylinder 32, thread groove 331 is formed on outer circumferential surface of inner cylinder 33, and a plurality of limiting sliding grooves 361 are formed on wall surface of sleeve four 36.

[0044] The connection relationship between storage mechanism 1, driving mechanism 2 and base 3 is described in detail below.

[0045] As shown in Figures 3 to 6As shown, the ring groove 321 on the outer cylinder 32 of the base 3 corresponds to the convex ring 212 on the knob 21 of the driving mechanism 2, the knob 21 is inserted into the outer cylinder 32, and the convex ring 212 is clamped into the ring groove 321. The sleeve one 112 of the medicine storage component 11 is inserted into the inner cylinder 33 of the base 3, the sleeve two 122 of the driving component 12 is sleeved on the outer periphery of the inner cylinder 33, the thread 1221 of the sleeve two 122 corresponds to the thread groove 331 of the inner cylinder 33, the sleeve two 122 is screwed by the cooperation of the thread 1221 and the thread groove 331, the pitch of the thread 1221 and the thread groove 331 matches the pitch of the driving component 12, and the sleeve two 122 is screwed with the inner cylinder 33, which can provide support for the central part of the driving component 12 and guide the screwing movement of the driving component 12, thereby improving the precision, stability and reliability of the medicine injection. Figures 4 to 6 As shown, the support 221 of the driving mechanism 2 is fixedly connected to the support column 34 of the base 3 by a fastener (not shown in the angle of the support column 34). Figures 4 to 6 The bottom end of the rotating shaft 25 is connected to the support plate 31 of the base 3; the coil spring 26 is inserted into the annular area between the sleeve three 35 and the sleeve four 36 of the base 3, one end of the coil spring 26 is connected to the base 3, and the other end is connected to the limiter 27; the sliding block 283 of the clamping block 28 corresponds to the limiting sliding groove 361 on the sleeve four 36, and the sliding block 283 is movably slid in the limiting sliding groove 361; the spring one 29 is located between the clamping block 28 and the support plate 31, the top end of the spring one 29 abuts against the clamping block 28, and the bottom end abuts against the support plate 31.

[0046] As shown in the figure, Figure 2 , Figure 16 As shown, the support 221 of the driving mechanism 2 is fixedly connected to the support column 34 of the base 3 by a fastener (not shown in the angle of the support column 34). Figure 3 As shown, the support 221 of the driving mechanism 2 is fixedly connected to the support column 34 of the base 3 by a fastener (not shown in the angle of the support column 34).

[0047] As shown in the figure, Figure 2 , Figure 16As shown, the circumferential wall surface of the support sleeve 41 of the bracket 4 is provided with a first sliding groove 46 and a second sliding groove 47, and the first sliding groove 46 and the second sliding groove 47 are respectively provided on the opposite sides of the support sleeve 41 in different directions. The first sliding groove 46 is a vertical through groove with an open top. The second sliding groove 47 is a through groove with a winding path, including a forward groove segment 471, a return groove segment 472, and a transition segment 473. The forward groove segment 471 and the return groove segment 472 are vertical groove segments, and the transition segment 473 is an inclined groove segment connecting the tail end of the forward groove segment 471 and the head end of the return groove segment 472. The tail end of the forward groove segment 471 is provided with a first limiting portion 474, and the tail end of the return groove segment 472 is provided with a second limiting portion 475.

[0048] As shown in Figure 2 , Figure 17 , the button assembly 5 includes a button 51, a press cover 52, a push block 53, and a spring 54. The press cover 52 is fixedly connected to the top of the button 51, and the push block 53 is fixedly connected to the bottom of the button 51. The bottom of the button 51 is provided with a buckle 511, and the push block 53 is correspondingly provided with a sleeve 531. The buckle 511 is clamped to the sleeve 531. The outer wall surface of the button 51 on the opposite sides is respectively provided with a vertical protrusion 512, and the wall surface of the button 51 is provided with a pressing arm 513 extending radially and outward. The sleeve 531 of the push block 53 extends radially and outward on the opposite sides, and the outer end of one side of the sleeve 531 is provided with a push plate 533 in the shape of an inverted L. As shown in Figures 13 to 15 , the button assembly 5 is inserted into the support sleeve 41 of the bracket 4, and the spring 54 is arranged between the bottom of the button assembly 5 and the bottom of the support sleeve 41. One end of the spring 54 abuts against the button assembly 5, and the other end abuts against the support sleeve 41. The button assembly 5 has a first position when not pressed and a second position after being pressed. The protrusion 512 of the button 51 corresponds to the first sliding groove 46 of the bracket 4, and the protrusion 512 is inserted into the first sliding groove 46 and can move up and down along the first sliding groove 46. The sleeve 532 of the push block 53 corresponds to the second sliding groove 47 of the bracket 4, and the sleeve 532 is inserted into the second sliding groove 47 and can move along the second sliding groove 47. As shown in Figure 13 , before injection, when the button assembly 5 is not pressed (in the first position), the sleeve 532 of the push block 53 is located at the head end of the forward groove segment 471 of the second sliding groove 47. As shown in Figure 14 , during injection, after the button assembly 5 is pressed (in the second position), the sleeve 532 of the push block 53 moves downward to the tail end of the forward groove segment 471 of the second sliding groove 47, and the first limiting portion 474 limits the sleeve 532 at the tail end of the forward groove segment 471 and prevents the sleeve 532 from rebounding. As shown in Figure 15As shown, after the injection is completed, the button assembly 5 is returned to the original position (the first position when the button is not pressed), the slide column 532 of the push block 53 is pushed to the front end of the return slot section 472 through the transition section 473, and the slide column 532 is moved upward to the tail end of the return slot section 472 under the action of the spring 54. The second limiting part 475 limits the slide column 532 to the tail end of the return slot section 472, and the slide column 532 is limited from rebounding. As shown in Figures 13 to 15 As shown, the push plate 533 of the push block 53 extends on the movement path of the protrusion 1222 arranged on the sleeve 122 of the driving component 12, and the push plate 533 is correspondingly matched with the protrusion 1222. As shown in Figure 13 、 Figure 14 As shown, before the injection, during the injection, and before the injection of the liquid medicine is completed, the protrusion 1222 is away from the push plate 533 and does not contact the push plate 533. As shown in Figure 15 As shown, after the injection of the liquid medicine is completed, the protrusion 1222 abuts against the push plate 533 and pushes the push plate 533 to move forward during the continuous pushing of the driving component 12, so that the slide column 532 of the push block 53 is moved to the return slot section 472 through the transition section 473 and is moved upward to return to the original position from the return slot section 472. As shown in Figures 4 to 6 As shown, the outer end of the pressing arm 513 on the button 51 extends downward toward the transmission wheel 24. As shown in Figure 4 、 Figure 6 As shown, before or after the injection, the button assembly 5 is not pressed, and the pressing arm 513 is separated from the transmission wheel 24 and does not contact the transmission wheel 24. As shown in Figure 5 As shown, during the injection, the pressing arm 513 moves downward with the button 51 after the button 51 is pressed downward, abuts against the transmission wheel 24, and presses the transmission wheel 24 downward. The wheel part 242 of the transmission wheel 24 is separated from the gear tooth 211 of the knob 21, and the wheel part 243 of the transmission wheel 24 is inserted into the insertion hole 271 of the limiter 27 and engaged with the gear tooth 273.

[0049] As shown in Figure 2 、 Figure 3As shown, the medicine injection assembly 6 comprises a connector 61, an injection needle 62, a connecting tube 63, a protective head 64, a sealing plug 65, and an adapter cover 66. The connector 61 is inserted into the supporting platform 421 of the support 4, and a liquid injection channel is formed in the connector 61. The injection needle 62 is inserted into the connector 61 and communicates with the liquid injection channel. The other end of the injection needle 62 penetrates through the needle penetrating hole of the button assembly 5 and the support 4 and then penetrates out of the bottom of the support 4. The protective head 64 is inserted into the end of the injection needle 62 to protect the end of the injection needle 62, and the upper end of the protective head 64 is inserted into the insertion hole 44 of the bottom of the support 4. The connecting tube 63 is connected to the connector 61 and communicates with the liquid injection channel of the connector 61. The other end of the connecting tube 63 is connected to the liquid outlet 1112 of the medicine liquid cylinder 111 and communicates with the medicine liquid cavity 110. The medicine liquid cavity 110 communicates with the injection needle 62 through the connecting tube 63 and the connector 61. The sealing plug 65 is arranged in the connector 61 above the injection needle 62 and the liquid injection channel to seal the injection needle 62 and the liquid injection channel. The adapter cover 66 is connected to the top of the connector 61. When the medicine liquid is filled into the medicine liquid cavity 110, the filling component can be connected to the adapter cover 66 so that the filling component communicates with the connecting tube 63 through the injection needle, and the medicine liquid can be filled into the medicine liquid cavity 110.

[0050] As shown in Figure 3 , the injection needle 62 is an integrally formed steel needle comprising a horizontal and straight section 621, an arc section 622, and a vertical section 623. The horizontal and straight section 621 and the vertical section 623 are connected to the arc section 622 through a circular arc 624, respectively. The horizontal and straight section 621 horizontally penetrates above the supporting arm 42 of the support 4, and the outer end thereof penetrates into the connector 61. The arc section 622 is arranged in the central cavity of the button assembly 5. The vertical section 623 vertically penetrates the button assembly 5 and the support 4 in sequence through the corresponding needle penetrating holes, and the protective head 64 is sleeved on the bottom end of the vertical section 623. The vertical section 623 is fixed on the button assembly 5 and can move up and down with the button assembly 5. The arc section 622 can provide sufficient deformation for the up and down movement of the vertical section 623. The injection needle 62 is an integrally formed piece, which can reduce the use of connecting pieces and is also beneficial to reduce the loss of medicine liquid and improve the injection precision.

[0051] As shown in Figures 1 to 3 , the circumferential wall of the bottom cover 8 is provided with a snap 81. When the bottom cover 8 is sleeved on the base 3, the snap 81 is buckled on the step 322 of the base 3. When the bottom cover 8 is removed, the snap 81 is buckled off the step 322. The inner circumferential wall of the bottom cover 8 is provided with a plurality of vertical strips 82 corresponding to the vertical grooves 323 of the base 3. When the bottom cover 8 is sleeved on the base 3, the vertical strips 82 are inserted into the vertical grooves 323.

[0052] In actual use, the present application mainly has three processes of medicine filling before injection, medicine liquid injection, and needle collection after injection: I. Medicine filling before injection, referring to Figure 4 , Figure 7(a)、 Figure 13 .

[0053] When the drug is loaded, the button assembly 5 protrudes upward and is not pressed down, and the drug can be loaded in two ways: the first is to load the drug by using a Westlin bottle, and the second is to load the drug by using a syringe.

[0054] When the first drug loading method is used: first, the Westlin bottle is inserted through the adapter from the adapter cover 66 of the drug injection assembly 6 and is connected to the liquid injection channel on the connector 61; after the bottom cover 8 is fixed, the knob 21 is rotated, the knob 21 drives the driving component 12 counterclockwise along the liquid cylinder 111 by the transmission wheel 24, and as the driving component 12 spirally descends, the air pressure in the liquid chamber 110 decreases, and under the action of negative pressure, the liquid in the Westlin bottle is sucked into the liquid chamber 110 for storage, until the liquid is completely stored in the liquid chamber 110.

[0055] When the second drug loading method is used, first, the driving component 12 is spirally lowered to the initial position (i.e. the initial position of dispensing the liquid); then, the syringe is inserted from the adapter cover 66 of the drug injection assembly 6 and is connected to the liquid injection channel on the connector 61, and the syringe is pulled out to extract the air in the liquid chamber 110; after the liquid chamber 110 is vacuumized, the syringe is removed and the liquid to be injected is drawn into the syringe; then, the syringe is inserted again from the adapter cover 66, that is, the liquid is pressed into the liquid chamber 110 for storage, until the liquid is completely stored in the liquid chamber 110.

[0056] II, liquid injection, refer to Figure 5 、 Figure 7 (b)、 Figure 14 .

[0057] First, the bottom cover 8 is removed, the release paper of the adhesive layer 9 is torn off together with the bottom cover 8, the protective head 64 of the drug injection assembly 6 is removed, and then the injection pump 100 is attached to the skin of the part of the human body that needs to be injected; Then, press down the button assembly 5, the button assembly 5 moves and penetrates into the human skin to reach the injection position, and the vertical section 623 of the injection needle 62 is driven by the button assembly 5; at the same time, the pressure arm 513 of the button assembly 5 presses down the transmission wheel 24, so that the wheel part of the transmission wheel 24 is disengaged from the gear teeth of the knob 21; The pressing arm 513 of the button assembly 5 presses the switch assembly 222 of the motor 22 during the pressing process, the motor 22 is started, and the driving part 12 is driven to rise clockwise by the driving belt of the driving wheel 23 and the transmission wheel 24; at the same time, the transmission wheel 24 is pressed, the clamping block 28 is pushed away from the limiter 27, the wheel part three 243 of the transmission wheel 24 is inserted into the limiter 27 and meshes with the gear tooth three 273, the rotation of the limiter 27 is released, and the coil spring 26 starts to provide power. The coil spring 26 drives the driving part 12 to rise clockwise through the limiter 27 and the transmission wheel 24. It should be noted that the power source of the driving part 12 can be selected from one of the motor 22 and the coil spring 26, or the motor 22 and the coil spring 26 can be selected together to provide power to the driving part 12. When the motor 22 is used for driving or the motor 22 and the coil spring 26 are used for driving together, the rotating speed of the motor 22 can be set to push the drug solution at a set speed.

[0058] The driving part 12 drives the drug in the drug cavity 110 to be injected into the human body through the injection needle 62.

[0059] III, needle retraction after injection, refer to Figure 6 、 Figure 7 (c)、 Figure 15 .

[0060] After the injection of the drug solution in the drug cavity 110 is completed, the protrusion 1222 of the driving part 12 rotates to the position where the push plate 533 of the button assembly 5 extends, the protrusion 1222 pushes the push block 53 to the return groove section 472 of the second sliding groove 47, the button assembly 5 moves upward under the action of the spring two 54, the pressing arm 513 of the button assembly 5 is separated from the switch assembly 222 of the motor 22 and the transmission wheel 24, the motor 22 is stopped, the button assembly 5 drives the vertical section 623 of the injection needle 62 to be separated from the human body, and at this time, the injection pump 100 can be removed to complete the injection work.

[0061] The above description is an explanation of the present application, not a limitation of the present application, and the present application can be modified in any form without departing from the spirit of the present application.

Claims

1. A spiral-type drug storage mechanism, characterized in that: include, The medicine storage component (11) has a spiral medicine liquid chamber (110). The driving component (12) has a driving rod (121) and a piston (124). The piston (124) is disposed in the liquid chamber (110). The piston (124) is driven by the driving rod (121) to move along the spiral wall of the liquid chamber (110).

2. The spiral-shaped drug storage mechanism according to claim 1, characterized in that: The drive rod (121) is set on the spiral trajectory of the liquid chamber (110), and the drive rod (121) moves along the spiral trajectory.

3. The spiral-shaped drug storage mechanism according to claim 1, characterized in that: The drive rod (121) is a helical rod, and the pitch of the drive rod (121) matches the pitch of the liquid medicine chamber (110). The liquid medicine chamber (110) is located at the upper part of the helical trajectory, and the drive component (12) is located at the lower part of the helical trajectory. The drive component (12) pushes the liquid medicine from bottom to top. Alternatively, the liquid medicine chamber (110) is located at the lower part of the helical trajectory, and the drive component (12) is located at the upper part of the helical trajectory. The drive component (12) pushes the liquid medicine from top to bottom.

4. The spiral-shaped drug storage mechanism according to claim 1, characterized in that: The medicine storage component (11) is provided with a spiral medicine cylinder (111). One end of the medicine cylinder (111) is open and the other end is closed. The closed end is provided with an outlet (1112). The medicine cavity (110) is defined by the spiral circumference of the medicine cylinder (111) and the closed end face.

5. The spiral-shaped drug storage mechanism according to claim 4, characterized in that: A surrounding plate (113) extends downward from the upper part of the liquid cylinder (111).

6. The spiral drug storage mechanism according to claim 3 or 4, characterized in that: The range of the arc of the liquid medicine cylinder (111) is 30° to 360°; the length of the spiral arc of the drive rod (121) is greater than the length of the spiral arc of the liquid medicine cylinder (111).

7. The spiral-shaped drug storage mechanism according to claim 1, characterized in that: The medicine storage component (11) and the driving component (12) are respectively provided with sleeves, and the central axis of the sleeve is coaxial with the central axis of the spiral. The first sleeve (112) of the medicine storage component (11) is inserted into the inner side of the support cylinder, and the second sleeve (122) of the driving component (12) is sleeved on the outer side of the support cylinder.

8. The spiral-shaped drug storage mechanism according to claim 6, characterized in that: The inner wall of sleeve 2 (122) is provided with thread (1221), and the outer wall of support cylinder is provided with thread groove (331). The thread (1221) and the thread groove (331) are engaged; the pitch of the thread (1221) and the thread groove (331) are matched with the pitch of the drive rod (121).

9. The spiral-shaped drug storage mechanism according to claim 1, characterized in that: A transmission structure is provided on the drive rod (121), and the transmission structure is a gear tooth; a reinforcing member (1212) is provided inside the rod part of the drive rod (121).

10. A patch-type syringe pump, characterized in that: The base (3) is provided with the spiral medicine storage mechanism and the drive mechanism (2) as described in claim 1. The drive component (12) of the medicine storage mechanism (1) is connected to the drive mechanism (2) and is driven by the drive mechanism (2) to make spiral motion. The medicine storage mechanism (1) is provided with a button assembly (5) and a medicine injection assembly (6). The medicine injection assembly (6) is connected to the medicine liquid chamber (110) of the medicine storage mechanism (1).

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