Dynamic glucometer capable of repeatedly emitting implantation needle

Abstract

The invention relates to the technical field of intrusive continuous blood glucose monitoring devices, in particular to a dynamic glucometer capable of repeatedly launching an implantation needle, which comprises a repeated launching device and an implantation module, the implantation module comprises an implantation base and an implantation top cover, an adhesive tape is arranged on the lower surface of the implantation base, a PET soft needle extending downwards is arranged in the center of the implantation base, and the implantation top cover is arranged on the implantation base. The imbedding top cover is arranged above the imbedding base in a sleeving manner, the top of the imbedding top cover is provided with a pair of edge clamping heads, the center of the imbedding top cover is provided with a steel needle in a sliding manner, the top of the steel needle is provided with a center clamping head, the steel needle is of a center control structure, and the PET soft needle is arranged in the steel needle in a penetrating manner; the repeated launching device comprises a shell, a shell seat, a shell cover and a loading base. According to the invention, efficient reuse of a dynamic glucometer emission mechanism is realized, the dynamic blood glucose monitoring cost is greatly reduced, and meanwhile, the installability, reliability and convenience of sensor implantation are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of invasive continuous blood glucose monitoring devices, in particular to a dynamic blood glucose meter with repeatedly emitting implantable needles. Background Art

[0002] Existing continuous glucose monitoring (CGM) systems typically consist of a subcutaneously implanted glucose monitoring sensor and an external transmitter. The transmitter collects electrochemical signals from the sensor and transmits the data via wireless transmission technology (such as Bluetooth) to a receiving device (such as a smartphone or dedicated monitor), allowing diabetic patients to monitor their blood glucose levels in real time.

[0003] However, the transmitter mechanism of most continuous blood glucose meters currently on the market is a disposable design. Once the transmitter mechanism inserts the sensor subcutaneously and is used, it is locked and must be discarded. Existing blood glucose monitoring sensors typically have a lifespan of 7-14 days. Because the transmitter mechanism is non-reusable, patients need to use a transmitter for each use cycle, resulting in high long-term cost, which is particularly financially stressful for diabetic patients who require long-term blood glucose monitoring. Although some manufacturers have attempted to alleviate this problem by reducing the cost of the transmitter mechanism, the fundamental flaw of the disposable design remains unresolved.

[0004] Therefore, there is an urgent need for a dynamic blood glucose meter with a reproducible firing implant needle to provide an effective solution to the defects of the existing technology. Summary of the Invention

[0005] The object of the present invention is to provide a continuous blood glucose meter with reproducible emission implant needles, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A dynamic blood glucose meter with a reusable implantable needle comprises a reusable emission device and an insertion module: the insertion module comprises an insertion base and an insertion top cover, the lower surface of the insertion base is provided with adhesive tape, a downwardly extending PET soft needle is provided at the center of the insertion base, the insertion top cover is sleeved over the insertion base, a pair of edge clamps are provided on the top of the insertion top cover, a steel needle is slidably installed at the center of the insertion top cover, a center clamp is provided on the top of the steel needle, the steel needle is a central control structure, and the PET soft needle is inserted into the steel needle; the reusable emission device comprises a shell, a shell seat, a shell cover and a loading base; a lifting push seat and a center tube are slidably installed in the shell, the bottom of the lifting push seat is clamped with the edge clamp, a pair of downwardly extending steel needle clips are provided at the center of the center tube, and the steel needle clips are clamped with the center clamp; the lifting push seat and A firing spring is provided between the shell covers, and a pair of claws extending into the interior of the shell are provided on the edge of the shell cover, and the outer protrusions at the ends of the claws are engaged with the button holes on the lifting push seat, and a pair of firing buttons for squeezing the claws are installed on the upper middle part of the outer wall of the shell; an outer edge is provided at the upper end of the center tube, and a needle extraction spring is provided between the outer edge and the lifting push seat; a needle extraction trigger mechanism is provided in the lifting push seat, and the needle extraction trigger mechanism includes a pair of L-shaped lock buckles installed for horizontal sliding back and forth, a pair of L-shaped lock buckles are arranged in a mirror-symmetrical manner and a lock buckle spring is provided between the two, the locking protrusion at the top of the L-shaped lock buckle is engaged with the locking hole at the lower end of the center tube, and the sliding rod at the bottom of the L-shaped lock buckle extends from the bottom of the lifting push seat, and a pair of upward-extending push rods are provided on the shell seat, and the upper ends of the push rods are in contact with the end of the slide rods through inclined surfaces; the loading base is used to push the lifting push seat up and down to reset.

[0008] Furthermore, a release mechanism is also provided in the lifting push seat, and the release mechanism includes a pair of "["-shaped release rods installed for horizontal sliding left and right, the pair of release rods are staggered and arranged facing each other, and a release spring is provided between the staggered ends, and a clamping platform and a clip groove are provided in the release rod. Under the action of the elastic force of the release spring, the release rod clamping platform on one side cooperates with the end head of the release rod on the opposite side to clamp the edge clamp; a pair of steel needle clips are staggered front and back, and the end edge of the steel needle clip on the same side is inserted into the clip groove of the release rod on the same side; a pair of release buttons for squeezing the release rod are installed in the middle and lower part of the outer wall of the shell.

[0009] Furthermore, an upwardly extending ejector cylinder is provided in the center of the central tube, an ejector is slidably installed in the ejector cylinder, an ejector spring is provided between the top of the ejector and the upper cover of the central tube, and the ejector rests on the central clamping head after the release mechanism is triggered.

[0010] Furthermore, a limiting hole is respectively provided on the front and rear side walls of the inserted base, and an elastic limiting protrusion is respectively provided on the front and rear side walls of the inserted top cover. The elastic limiting protrusion is engaged with the limiting hole, and a tail wing extending outward is provided at the bottom of the elastic limiting protrusion. The tail wing is located above the top rod. After the tail wing contacts the top rod, it turns outward and drives the elastic limiting protrusion to disengage from the limiting hole.

[0011] A dynamic blood glucose meter with a reproducible needle emitter comprises an implant base. The implant base is a split structure. The implant base is snap-fitted with a Bluetooth module. The implant base and the Bluetooth module are electrically connected via gold-plated contacts on the contact surface.

[0012] Furthermore, a dynamic blood glucose meter with a reproducible firing implant needle is provided, wherein a button battery is embedded in the implant base.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This invention uses a reusable, repeatable transmitter, requiring only replacement of the implant module, significantly reducing the patient's financial burden. A steel needle guides the PET soft needle for puncture, ensuring implant accuracy. A needle extraction trigger ensures precise needle extraction upon completion of the injection, preventing damage to the human body. A release mechanism allows for smooth release of the implant cap and needle, simplifying the replacement process. This invention achieves efficient reuse of the dynamic blood glucose meter's transmitter mechanism, significantly reducing the cost of dynamic blood glucose monitoring while ensuring the installability, reliability, and convenience of sensor implantation.

[0015] 2. In order to prevent the steel needle from getting stuck, the present invention uses an ejector spring to push the ejector to continuously push the center clamp during the release process, thereby assisting the steel needle in releasing and avoiding the occurrence of jamming.

[0016] 3. The embedded base of the present invention adopts a split structure, which can be quickly installed or removed with the Bluetooth module through a snap-on structure. When the embedded module is replaced, the Bluetooth module can be removed and reused, and only the embedded base needs to be replaced, further reducing the cost of dynamic blood glucose monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an external view of a continuous blood glucose meter with a reproducible injection needle.

[0018] Figure 2 A vertical cross-sectional view of a continuous blood glucose meter with a re-firing implantable needle when loaded and ready to fire;

[0019] Figure 3 This is a vertical cross-sectional view of the repetitive launcher when the launch is completed;

[0020] Figure 4 It is a schematic diagram of the structure of the launch trigger component of the repeating launch device;

[0021] Figure 5 This is a structural diagram of the lifting and pushing seat, the insertion module and the central tube;

[0022] Figure 6 It is a structural diagram of the needle withdrawal trigger mechanism;

[0023] Figure 7 Schematic diagram of the structure of the release mechanism;

[0024] Figure 8 Schematic diagram of the bottom structure of the release mechanism;

[0025] Figure 9 It is a structural diagram of the embedded module;

[0026] Figure 10 A schematic diagram of the structure placed in the base;

[0027] Figure 11 for Figure 3 A magnified view of the local structure at K in the middle.

[0028] In the figure: 100, housing; 110, housing cover; 111, claw; 120, housing base; 121, ejector; 130, firing button; 131, release button; 200, loading base; 300, lifting and pushing base; 301, button hole; 400, insert module; 410, insert base; 411, PET soft needle; 412, adhesive tape; 413, Bluetooth module; 414, limiting hole; 420, insert top cover; 421, edge clamp; 422, center clamp; 423, Steel needle; 424, elastic limiting protrusion; 500, center tube; 501, locking hole; 502, ejector tube; 510, ejector; 511, ejector spring; 520, steel needle clip; 600, needle extraction trigger mechanism; 601, slide bar; 602, locking protrusion; 603, locking spring; 604, L-shaped lock; 700, release mechanism; 701, release rod; 702, card table; 703, clip slot; 704, release spring; 800, launch spring; 900, needle extraction spring. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figures 1 to 11A dynamic blood glucose meter with a reproducible needle emitter is characterized in that it includes a reproducible emitter and an inserting module 400: the inserting module 400 includes an inserting base 410 and an inserting top cover 420, the lower surface of the inserting base 410 is provided with a tape 412, a PET soft needle 411 extending downward is provided at the center of the inserting base 410, the inserting top cover 420 is sleeved on the inserting base 410, a pair of edge clamps 421 are provided on the top of the inserting top cover 420, a steel needle 423 is slidably installed at the center of the inserting top cover 420, and the steel needle 423 is provided at the center of the inserting top cover 420. 3 A center clamp 422 is provided on the top, a steel needle 423 is a central control structure, and a PET soft needle 411 is inserted into the steel needle 423; the repeated firing device includes a shell 100, a shell base 120, a shell cover 110 and a loading base 200; a lifting push seat 300 and a center tube 500 are slidably installed in the shell 100, the bottom of the lifting push seat 300 is engaged with the edge clamp 421, and a pair of downwardly extending steel needle clips 520 are provided at the center of the center tube 500, and the steel needle clips 520 are engaged with the center clamp 422; the lifting push seat 300 0 and the shell cover 110 is provided with a firing spring 800, the edge of the shell cover 110 is provided with a pair of claws 111 extending into the interior of the shell 100, the outer protrusions at the ends of the claws 111 are engaged with the buckle holes 301 on the lifting push seat 300, and a pair of firing buttons 130 for squeezing the claws 111 are installed in the upper middle part of the outer wall of the shell 100; the upper end of the central tube 500 is provided with an outer edge, and a needle withdrawal spring 900 is provided between the outer edge and the lifting push seat 300; the lifting push seat 300 is provided with a needle withdrawal trigger mechanism 600, which includes a pair of front An L-shaped lock catch 604 is installed for horizontal sliding at the rear end. A pair of L-shaped lock catches 604 are arranged in a mirror-symmetrical manner and a lock spring 603 is provided between the two. The locking protrusion 602 on the top of the L-shaped lock catch 604 is snap-fitted with the locking hole 501 at the lower end of the center tube 500. The sliding rod 601 at the bottom of the L-shaped lock catch 604 extends from the bottom of the lifting push seat 300. A pair of upward-extending push rods 121 are provided on the shell seat 120. The upper ends of the push rods 121 are in contact with the end of the sliding rod 601 through an inclined surface; the loading base 200 is used to push the lifting push seat 300 up and down to reset.

[0031] A release mechanism 700 is also provided in the lifting push seat 300. The release mechanism 700 includes a pair of "["-shaped release rods 701 installed for horizontal sliding left and right. The pair of release rods 701 are staggered and arranged facing each other, and a release spring 704 is provided between the staggered ends. A clamping platform 702 and a clip groove 703 are provided in the release rod 701. Under the elastic force of the release spring 704, the clamping platform 702 of the release rod 701 on one side cooperates with the end of the release rod 701 on the opposite side to clamp the edge clamp 421; a pair of steel needle clips 520 are staggered front and back, and the end edge of the steel needle clip 520 on the same side is inserted into the clip groove 703 of the release rod 701 on the same side; a pair of release buttons 131 for squeezing the release rod 701 are installed in the middle and lower part of the outer wall of the shell 100.

[0032] A limiting hole 414 is provided on the front and rear side walls of the inserted base 410, and an elastic limiting protrusion 424 is provided on the front and rear side walls of the inserted top cover 420. The elastic limiting protrusion 424 is engaged with the limiting hole 414, and a tail wing extending outward is provided at the bottom of the elastic limiting protrusion 424. The tail wing is located above the top rod 121. After the tail wing contacts the top rod 121, it turns outward and drives the elastic limiting protrusion 424 to disengage from the limiting hole 414.

[0033] Working principle of this embodiment:

[0034] Step 1: Insert the module and load it

[0035] like Figure 2 As shown, the lifting and pushing seat 300 is located at the uppermost loading position before use, and the outer protrusion of the end of the front clamping claw 111 of the module 400 is engaged with the buckle hole 301 on the lifting and pushing seat 300. Figure 1 、 Figure 2 、 Figure 5 and Figure 7 As shown, when in use, the sealed package of the insertion module 400 is opened, and the insertion module 400 including the insertion base 410 and the insertion top cover 420 is pushed through the loading base 200, and the insertion top cover 420 is fixed to the lifting push seat 300 through the edge clamp 421, and the steel needle clip 520 clamps the center clamp 422 to complete the loading.

[0036] Step 2: Launch

[0037] When launching, the shell base 120 is in close contact with the skin. Figure 2 、 Figure 3 As shown, pressing the firing button 130 squeezes the claw 111 to disengage it from the button hole 301, releasing the firing spring 800. Figure 3 and Figure 11 As shown, the launching spring 800 pushes the lifting seat 300 and the insertion module 400 to move downward quickly until the insertion module 400 moves to the shell seat 120, that is, the launching is completed. At this time, the steel needle 423 together with the PET soft needle 411 inside it and pierces the skin, and the adhesive tape 412 is close to the skin.

[0038] like Figure 6 As shown, upon reaching the firing completion state, the slide bar 601 is lifted by the upper end of the ejector rod 121, pushing the L-shaped lock catch 604 inward, disengaging the locking protrusion 602 from the locking hole 501 and releasing the central tube 500. The needle withdrawal spring 900 drives the central tube 500 upward, and the steel needle clip 520 retracts the steel needle 423 upward, leaving only the PET soft needle 411 subcutaneously for blood glucose monitoring. Finally, the re-launching device is removed from the skin, and the base 410 is inserted and attached to the skin with the help of the adhesive tape 412, and the PET soft needle 411 is inserted subcutaneously.

[0039] Step 3: Reload and release the top cap

[0040] like Figure 7 As shown, after the firing is completed, the top cover 420 is still not released by the release mechanism, and the top cover 420 is retained at the bottom of the lifting push seat 300, while the steel needle 423 is clamped on the steel needle clip 520 at the lower end of the central tube 500. In order to ensure that the reusable firing device can be reused, it is necessary to detach the top cover 420 and the steel needle 423 from the reusable firing device. By pushing the loading base 200, the top cover 420 and the lifting push seat 300 move up and reset to Figure 2 In the middle loading position, reloading is completed.

[0041] like Figure 7 and Figure 8 As shown, after reloading, the distal end of the needle clip 520 is located in the clip slot 703 of the release lever 701 on the same side. At this time, the center clamp 422 and the edge clamp 421 are located on the same horizontal line. Pressing the release button 131 pushes the release levers 701 on both sides to slide toward each other. During the sliding process, the clamping platform 702 moves away from the edge clamp 421, releasing the insertion cover 420. At the same time, under the action of the clip slot 703, the pair of needle clips 520 are stretched open, and the center clamp 422 on the top of the needle 423 is also released. The insertion cover 420 and the needle 423 fall under the action of gravity.

[0042] In addition, after completing step three again, the front lifting pusher 300 is still located at the uppermost loading position, ready for loading the module 400 again.

[0043] The traditional CGM transmitter is disposable, and the entire transmitter must be discarded every 7-14 days after each sensor replacement. This embodiment uses a reusable repeating transmitter device, which only requires replacing the insertion module, greatly reducing the financial burden on patients; a steel needle 423 is used to guide the puncture of the PET soft needle 411 to ensure implantation accuracy; the needle extraction trigger mechanism 600 ensures that the steel needle is accurately extracted when the launch is completed to avoid damage to the human body; the release mechanism realizes the smooth release of the insertion top cover 420 and the steel needle, simplifying the replacement process. This embodiment realizes the efficient reuse of the dynamic blood glucose meter transmitter mechanism, greatly reducing the cost of dynamic blood glucose monitoring, while ensuring the installability, reliability and convenience of sensor implantation.

[0044] Example 2: Please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7A continuous blood glucose meter with reproducible needle ejection is different from Example 1 in that an upwardly extending ejector tube 502 is provided at the center of the central tube 500, an ejector 510 is slidably installed in the ejector tube 502, and an ejector spring 511 is provided between the top of the ejector 510 and the upper cover of the central tube 500. After the release mechanism 700 is triggered, the ejector 510 abuts against the central clamp 422.

[0045] Working principle of this embodiment:

[0046] like Figure 6 and Figure 7 As shown, when the release button 131 is pressed, the release mechanism 700 is triggered, and the release rods 701 on both sides slide toward each other. Under the action of the clip groove 703, a pair of steel needle clips 520 are stretched open, and the center clamp 422 on the top of the steel needle 423 is also released. However, due to the small weight of the steel needle 423, the center clamp 422 may be retained on the steel needle clip 520 on one side during the process of the steel needle clip 520 being stretched open, and cannot be released smoothly. In order to prevent the steel needle 423 from getting stuck, during the release process, the ejector spring 511 pushes the ejector 510 to continuously push the center clamp 422, assisting the release of the steel needle 423 to avoid jamming.

[0047] Example 3: Please refer to Figures 9-10 A dynamic blood glucose meter with a reusable implantable needle, a dynamic blood glucose meter with a reusable implantable needle, includes an implant base 410, the implant base 410 is a split structure, the implant base 410 is snap-fitted with a Bluetooth module 413, and the implant base 410 and the Bluetooth module 413 are electrically connected through gold-plated contacts on the contact surface.

[0048] A continuous blood glucose meter with a reproducible firing needle is provided, wherein a button battery is embedded in a base 410 .

[0049] Working principle of this embodiment:

[0050] like Figure 9 and Figure 10 As shown, the insertion base 410 adopts a split structure and can be quickly installed or removed with the Bluetooth module 413 through a snap-on structure. After the insertion module 400 is inserted into the skin, the Bluetooth module 413 is installed on the insertion base 10. The contact surface between the Bluetooth module 413 and the insertion base 410 is provided with gold-plated electrical contacts to ensure stable transmission of blood glucose monitoring data to the mobile phone / receiving device, automatically pairing with external devices such as smart phones, and transmitting blood glucose data collected by the PET soft needle 411 in real time. A button battery is embedded in the base 410 to power the Bluetooth module 413. When the insertion module 400 is replaced, the Bluetooth module 413 can be removed and reused, and only the insertion base 410 needs to be replaced. This embodiment realizes the reuse of the Bluetooth module 413, further reducing the cost of dynamic blood glucose monitoring.

Claims

1. A continuous blood glucose meter with a reproducible needle, characterized in that: It includes a repeating emission device and an insertion module (400): The insertion module (400) comprises an insertion base (410) and an insertion top cover (420). The lower surface of the insertion base (410) is provided with adhesive tape (412). A PET soft needle (411) extending downward is provided at the center of the insertion base (410). The insertion top cover (420) is sleeved on the insertion base (410). A pair of edge clamps (421) are provided on the top of the insertion top cover (420). A steel needle (423) is slidably installed at the center of the insertion top cover (420). A center clamp (422) is provided on the top of the steel needle (423). The steel needle (423) is a central control structure. The PET soft needle (411) is inserted into the steel needle (423). The repeating firing device comprises a shell (100), a shell base (120), a shell cover (110) and a loading base (200); a lifting push seat (300) and a center tube (500) are slidably installed in the shell (100); the bottom of the lifting push seat (300) is engaged with the edge clamp (421); a pair of steel needle clips (520) extending downward are provided at the center of the center tube (500); the steel needle clips (520) are engaged with the center clamp (422); the lifting push seat (300) and the shell cover are engaged with each other. (110), a firing spring (800) is provided between the shell cover (110), a pair of claws (111) extending into the interior of the shell (100) are provided on the edge of the shell cover (110), the outer protrusions at the ends of the claws (111) are engaged with the buckle holes (301) on the lifting push seat (300), and a pair of firing buttons (130) for squeezing the claws (111) are installed on the upper middle part of the outer wall of the shell (100); an outer edge is provided on the upper end of the central tube (500), and a needle withdrawal spring (900) is provided between the outer edge and the lifting push seat (300); A needle extraction trigger mechanism (600) is provided in the lifting push seat (300), and the needle extraction trigger mechanism (600) includes a pair of L-shaped lock buckles (604) installed for horizontal sliding in the front and rear directions. The pair of L-shaped lock buckles (604) are arranged in a mirror-symmetrical manner and a lock buckle spring (603) is provided between the two. The locking protrusion (602) at the top of the L-shaped lock buckle (604) is engaged with the locking hole (501) at the lower end of the central tube (500). The slide bar (601) at the bottom of the L-shaped lock buckle (604) extends from the bottom of the lifting push seat (300). A push rod (121) extending upward is provided on the front and rear sides of the shell seat (120). The upper end of the push rod (121) contacts the end of the slide bar (601) through an inclined surface. The loading base (200) is used to push the lifting push seat (300) up and down to reset.

2. A continuous blood glucose meter with a reproducible needle according to claim 1, characterized in that: A release mechanism (700) is also provided in the lifting push seat (300), and the release mechanism (700) includes a pair of "["-shaped release rods (701) installed for horizontal sliding left and right, the pair of release rods (701) are staggered and arranged facing each other, and a release spring (704) is provided between the staggered ends, and a clamping platform (702) and a clip groove (703) are provided in the release rod (701), and under the elastic force of the release spring (704), the clamping platform (702) of one side of the release rod (701) cooperates with the end of the opposite side release rod (701) to clamp the edge clamp (421); a pair of steel needle clips (520) are staggered front and back, and the end edges of the same side steel needle clips (520) are inserted into the clip groove (703) of the same side release rod (701); a pair of release buttons (131) for squeezing the release rod (701) are installed in the middle and lower part of the outer wall of the shell (100).

3. A continuous blood glucose meter with a reproducible needle according to claim 1, characterized in that: An upwardly extending ejector cylinder (502) is provided at the center of the central tube (500), an ejector pin (510) is slidably installed in the ejector pin cylinder (502), an ejector pin spring (511) is provided between the top of the ejector pin (510) and the upper cover of the central tube (500), and the ejector pin (510) abuts against the central clamping head (422) after the release mechanism (700) is triggered.

4. A continuous blood glucose meter with a reproducible needle according to claim 1, characterized in that: A limiting hole (414) is respectively provided on the front and rear side walls of the insertion base (410), and an elastic limiting protrusion (424) is respectively provided on the front and rear side walls of the insertion top cover (420). The elastic limiting protrusion (424) is engaged with the limiting hole (414). A tail wing extending outward is provided at the bottom of the elastic limiting protrusion (424). The tail wing is located above the top rod (121). After the tail wing contacts the top rod (121), it turns outward and drives the elastic limiting protrusion (424) to disengage from the limiting hole (414).

5. A continuous blood glucose meter with a reproducible needle, comprising an insertion base (410), wherein the insertion base (410) is suitable for the insertion module (400) described in any one of claims 1 to 4, and is characterized in that: The insert base (410) is a split structure, and the insert base (410) and the Bluetooth module (413) are snap-fitted together. The insert base (410) and the Bluetooth module (413) are electrically connected via gold-plated contacts on the contact surface.

6. A continuous blood glucose meter with a reproducible needle according to claim 5, characterized in that: The insertion base (410) is embedded with a button battery.

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