A driving mechanism of a casing retracting needle device and the casing retracting needle device

Abstract

The present invention relates to the technical field of drive mechanisms, and specifically relates to a drive mechanism for a sleeve retracting needle device and a sleeve retracting needle device. The drive mechanism of the sleeve retracting needle device includes: a slider supporting component; a sliding block; a slider driving component that drives the sliding block to move so that the telescopic needle sleeve and the telescopic needle are simultaneously extended to reach the extended position; a needle sleeve driving component that drives the telescopic needle sleeve to retract in a direction opposite to the extending direction of the telescopic needle at the extended position; a triggering mechanism for the needle sleeve driving component, including: a guiding slide rail provided on one of the slider supporting component and the telescopic needle sleeve fixing member, and a guiding portion provided on the other of the slider supporting component and the telescopic needle sleeve fixing member and slidably disposed within the guiding slide rail. Through the above structure, it is possible to effectively drive the sleeve and the telescopic needle to extend simultaneously, and after they are extended to a certain length, drive the sleeve to retract again.

Description

Technical Field

[0001] The present invention relates to the technical field of a telescopic needle driving mechanism with a needle sleeve, and particularly relates to a driving mechanism for a cannula retraction device and a cannula retraction device. Background Art

[0002] A cannula retraction device refers to a telescopic needle with a cannula. This cannula retraction device needs to drive the telescopic needle and the cannula to extend simultaneously through a driving mechanism, and after the two extend to a certain length, it realizes the device for retracting the cannula. This device is widely used in multiple fields such as medical devices, machining manufacturing, etc. In the existing technology, there is a lack of a driving mechanism for a telescopic needle with a cannula. Therefore, those skilled in the art urgently need a driving mechanism that can effectively drive the cannula and the telescopic needle to extend simultaneously, and after the two extend to a certain length, drive the cannula to retract again. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the lack in the prior art of a driving mechanism that can effectively drive the cannula and the telescopic needle to extend simultaneously, and after the two extend to a certain length, drive the cannula to retract again. To solve the above problem, the present invention provides a driving mechanism for a cannula retraction device, including:

[0004] A slider supporting member;

[0005] A sliding block, the sliding block is slidably arranged on the slider supporting member under driving, and a telescopic needle is further arranged on the sliding block, and a telescopic needle sleeve slidably connected thereto is sleeved outside the telescopic needle; the telescopic needle sleeve is slidably arranged on the sliding block through a telescopic needle sleeve fixing member;

[0006] A slider driving member, driving the sliding block to move so that the telescopic needle sleeve and the telescopic needle extend simultaneously to reach the extended position;

[0007] A needle sleeve driving member, correspondingly arranged with the telescopic needle sleeve fixing member, driving the telescopic needle sleeve to retract in a direction opposite to the extending direction of the telescopic needle at the extended position;

[0008] A needle sleeve driving member triggering mechanism, including: a guiding slide rail arranged on one of the slider supporting member and the telescopic needle sleeve fixing member, and a guiding portion arranged on the other of the slider supporting member and the telescopic needle sleeve fixing member and slidably arranged in the guiding slide rail; the guiding slide rail includes: a first guiding track for guiding the sliding block and the telescopic needle sleeve fixing member to slide towards the extended position, and a second guiding track for guiding the telescopic needle sleeve fixing member to retract in a direction opposite to the extending direction of the telescopic needle.

[0009] Optionally, the first guiding track and the second guiding track are arranged in parallel side by side and are connected by an arc track.

[0010] Optionally, a transverse guiding channel and a longitudinal guiding channel adapted to the first guiding track and the second guiding track are provided on the sliding block; the transverse guiding channel and the longitudinal guiding channel form an L-shaped guiding channel for accommodating the guiding part.

[0011] Optionally, a transverse guiding hole arranged along the transverse direction of the sliding block and corresponding to the transverse guiding channel is provided on the telescopic needle sleeve fixing member;

[0012] One end of the guiding part is inserted into the guiding slide rail, and the other end passes through the transverse guiding hole and extends into the L-shaped guiding channel.

[0013] Optionally, there are two L-shaped guiding channels, which are symmetrically arranged on both sides of the sliding block; two guiding parts adapted to the L-shaped guiding channels are provided on the telescopic needle sleeve fixing member.

[0014] Optionally, the telescopic needle sleeve fixing member includes: a spring sleeve and extension plates arranged on both sides of the spring sleeve;

[0015] The transverse guiding channel is arranged on the extension plate.

[0016] Optionally, the slider driving component is a first compression spring with one end connected to the slider supporting component and the other end connected to the sliding block; and / or,

[0017] The needle sleeve driving component is a second compression spring with one end connected to the telescopic needle sleeve fixing member and the other end connected to the sliding block.

[0018] Optionally, the sliding block includes: a sliding block housing and a sliding block cover body snap-connected to the sliding block housing; a receiving cavity for accommodating the telescopic needle sleeve fixing member is formed by the sliding block cover body and the sliding block housing;

[0019] A limiting sleeve for accommodating the end part of the first compression spring is further provided on the sliding block cover body.

[0020] Optionally, the second compression spring is accommodated in the annular inner cavity of the spring sleeve.

[0021] Optionally, the guiding slide rail is arranged on the slider supporting component, and the guiding part passes through the telescopic needle sleeve fixing member and the sliding block and is slidably arranged in the guiding slide rail.

[0022] A cannula retraction device includes: a driving mechanism of the cannula retraction device, and a retractable needle and a retractable cannula.

[0023] The technical solution of the present invention has the following advantages:

[0024] 1. The driving mechanism of the cannula retraction needle device of the present invention includes: a slider supporting member; a sliding block, which is slidably arranged on the slider supporting member under driving, and a telescopic needle is further arranged on the sliding block, and a telescopic needle sleeve slidably connected thereto is further sleeved outside the telescopic needle; the telescopic needle sleeve is slidably arranged on the sliding block through a telescopic needle sleeve fixing member; a slider driving member, which drives the sliding block to move so that the telescopic needle sleeve and the telescopic needle simultaneously extend to an extended position; a needle sleeve driving member, which is correspondingly arranged with the telescopic needle sleeve fixing member, and drives the telescopic needle sleeve to retract in a direction opposite to the extending direction of the telescopic needle at the extended position;

[0025] The triggering mechanism of the needle sleeve driving member includes: a guiding slide rail arranged on one of the slider supporting member and the telescopic needle sleeve fixing member, and a guiding portion arranged on the other of the slider supporting member and the telescopic needle sleeve fixing member and slidably arranged in the guiding slide rail; the guiding slide rail includes: a first guiding track for guiding the sliding block and the telescopic needle sleeve fixing member to slide towards the extended position, and a second guiding track for guiding the telescopic needle sleeve fixing member to retract in a direction opposite to the extending direction of the telescopic needle.

[0026] In the present invention, the telescopic needle sleeve and the telescopic needle inside the telescopic needle sleeve can be effectively driven to extend out of the applicator through the above-mentioned slider driving member; in addition, the telescopic needle sleeve can be driven to retract through the needle sleeve driving member. In order to ensure that the telescopic needle sleeve triggers the retraction action at a preset time, the present invention further includes: a triggering mechanism of the needle sleeve driving member. The guiding slide rail and the guiding portion on the triggering mechanism of the needle sleeve driving member are respectively arranged on the slider supporting member and the telescopic needle sleeve fixing member, so that the telescopic needle sleeve fixing member is guided by the guiding slide rail composed of the above-mentioned first guiding track and the second guiding track. After the telescopic needle sleeve fixing member moves a certain distance driven by the slider driving member in the first guiding track, it enters the second guiding track and is thus driven by the needle sleeve driving member to move in a direction opposite to the extending direction of the telescopic needle. Thus, after the telescopic needle sleeve extends a certain length, the retraction action of the telescopic needle sleeve can be quickly and effectively realized.

[0027] 2. For the driving mechanism of the cannula retraction needle device of the present invention, the first guiding track and the second guiding track are arranged in parallel and are connected by an arc track.

[0028] By arranging an arc track between the first guiding track and the second guiding track to connect the two, the above-mentioned arc track can stably and effectively guide the guiding portion to enter the second guiding track from the first guiding track.

[0029] 3. The driving mechanism of the cannula retraction device of the present invention, wherein a transverse guiding channel and a longitudinal guiding channel adapted to the first guiding track and the second guiding track are provided on the sliding block; the transverse guiding channel and the longitudinal guiding channel form an L-shaped guiding channel for accommodating the guiding portion.

[0030] In the present invention, a transverse guiding channel and a longitudinal guiding channel are provided on the sliding block. When the guiding portion is in the transverse guiding channel, the guiding portion slides within the first guiding track, thereby driving the sliding block towards the extended position. During this process, the telescopic cannula and the telescopic needle slide together towards the extended position direction. When the sliding block slides a preset distance, the guiding portion enters the second guiding track under the guidance of the guiding slide rail. After the guiding portion enters the second guiding track, the guiding portion moves towards the reset position under the drive of the cannula driving component. The guiding portion is connected to the telescopic cannula fixing member, thereby driving the telescopic cannula fixing member towards the reset position, and further driving the telescopic cannula to complete the retraction action through the telescopic cannula fixing member.

[0031] 4. The driving mechanism of the cannula retraction device of the present invention, wherein a transverse guiding hole arranged along the transverse direction of the sliding block and corresponding to the transverse guiding channel is provided on the telescopic cannula fixing member; one end of the guiding portion is inserted into the guiding slide rail, and the other end passes through the transverse guiding hole and extends into the L-shaped guiding channel.

[0032] In the present invention, by providing a transverse guiding hole on the telescopic cannula fixing member and inserting the guiding portion into the transverse guiding hole and slidingly engaging it with the L-shaped guiding channel, the above setting method can effectively reduce the processing cost of the guiding portion slidably arranged on the telescopic cannula fixing member and avoid the problem of complex processing when setting a guiding portion connected to it by clamping on the telescopic cannula fixing member.

[0033] 5. The driving mechanism of the cannula retraction device of the present invention, wherein there are two L-shaped guiding channels, which are symmetrically arranged on both sides of the sliding block; two guiding portions adapted to the L-shaped guiding channels are provided on the telescopic cannula fixing member.

[0034] In the present invention, by providing two symmetric guiding portions on the sliding block and the telescopic cannula fixing member, the sliding actions of the sliding block and the telescopic cannula fixing member can be ensured to be stable and reliable.

[0035] 6. The driving mechanism of the cannula retraction device of the present invention, wherein the slider driving component is a first compression spring with one end connected to the slider supporting component and the other end connected to the sliding block; and / or, the cannula driving component is a second compression spring with one end connected to the telescopic cannula fixing member and the other end connected to the sliding block.

[0036] In the present invention, the driving actions on the sliding block and the telescopic needle sleeve fixing member can be stably and reliably achieved through the above-mentioned first compression spring and second compression spring.

[0037] 7. The driving mechanism of the cannula retracting needle device of the present invention, wherein the sliding block includes: a sliding block housing and a sliding block cover body snap-connected to the sliding block housing; a receiving cavity for receiving the telescopic needle sleeve fixing member is defined between the sliding block cover body and the sliding block housing; a limiting sleeve for receiving the end of the first compression spring is further provided on the sliding block cover body.

[0038] In the present invention, through the above-mentioned sliding block housing and sliding block cover body snap-connected to each other, it is convenient for the staff to assemble the internal structure of the sliding block. Moreover, through the above-mentioned limiting sleeve, the first compression spring can be effectively limited, ensuring its stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 An exploded assembly diagram of the sliding block, the slider supporting member and the telescopic needle sleeve fixing member in the state where the driving mechanism is not triggered provided by the present invention;

[0041] Figure 2 An assembly diagram of the sliding block, the slider supporting member and the telescopic needle sleeve fixing member in the state where the driving mechanism is not triggered provided by the present invention;

[0042] Figure 3 A three-dimensional structural diagram of the applicator of the continuous blood glucose monitor provided by the present invention;

[0043] Figure 4 A partially enlarged schematic diagram of the top of the inner cavity of the driving mechanism in the state where the driving mechanism is not triggered provided by the present invention;

[0044] Figure 5 A schematic diagram of the setting position of the guiding slide rail on the slider supporting member provided by the present invention;

[0045] Figure 6 A schematic diagram of the setting position of the slider driving member provided by the present invention;

[0046] Figure 7 A schematic diagram of the setting position of the needle sleeve driving member provided by the present invention;

[0047] Figure 8 Schematic diagram of the relative positions of the telescopic needle sleeve and the telescopic needle provided by the present invention;

[0048] Figure 9 Schematic three-dimensional structure diagram of the telescopic needle sleeve fixing member provided by the present invention;

[0049] Figure 10 Schematic three-dimensional structure diagram of the sliding block provided by the present invention.

[0050] Description of reference numerals:

[0051] 1 - slider supporting member; 2 - sliding block; 3 - telescopic needle; 4 - telescopic needle sleeve; 5 - slider driving member; 6 - needle sleeve driving member; 7 - telescopic needle sleeve fixing member; 8 - guiding slide rail; 9 - guiding portion; 10 - first guiding track; 11 - second guiding track; 12 - arc track; 13 - transverse guiding channel; 14 - longitudinal guiding channel; 15 - transverse guiding hole; 16 - L-shaped guiding channel; 17 - spring sleeve; 18 - extension plate; 19 - sliding block housing; 20 - sliding block cover; 21 - limiting sleeve. Detailed implementation manners

[0052] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0053] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Embodiment 1

[0057] The driving mechanism of the casing retraction needle device in this embodiment, such as Figure 1 and Figure 2 shown, includes:

[0058] Slider supporting member 1;

[0059] Slider 2, the slider 2 is slidably arranged on the slider supporting member 1 under driving, and a retractable needle 3 is also arranged on the slider 2. As Figure 8 shown, a retractable needle sleeve 4 slidably connected to it is also sleeved outside the retractable needle 3; the retractable needle sleeve 4 is slidably arranged on the slider 2 through a retractable needle sleeve fixing member 7; as Figure 1 and Figure 10 shown, a transverse guiding channel 13 and a longitudinal guiding channel 14 adapted to the first guiding track 10 and the second guiding track 11 are arranged on the slider 2; the transverse guiding channel 13 and the longitudinal guiding channel 14 form an L-shaped guiding channel 16 for accommodating the guiding portion 9;

[0060] Retractable needle sleeve fixing member 7, the retractable needle sleeve fixing member 7 in this embodiment is as Figure 9 and Figure 5 shown, the retractable needle sleeve fixing member 7 includes: a spring sleeve 17 and extension plates 18 arranged on both sides of the spring sleeve 17; the transverse guiding channel 13 is arranged on the extension plate 18. A transverse guiding hole 15 arranged along the transverse direction of the slider 2 and corresponding to the transverse guiding channel 13 is arranged on the above-mentioned retractable needle sleeve fixing member 7; the guiding portion 9 is inserted into the guiding slide rail 8 at one end, passes through the transverse guiding hole 15 at the other end and extends into the L-shaped guiding channel 16;

[0061] Slider driving member 5, driving the slider 2 to move so that the retractable needle sleeve 4 and the retractable needle 3 extend out simultaneously to reach the extended position; in this embodiment, as Figure 6 shown, the slider driving member 5 is a first compression spring with one end connected to the slider supporting member 1 and the other end connected to the slider 2;

[0062] Needle sleeve driving member 6, corresponding to the retractable needle sleeve fixing member 7, driving the retractable needle sleeve 4 to retract in the direction opposite to the extending direction of the retractable needle 3 at the extended position; as Figure 7The shown needle sleeve driving member 6 is a second compression spring with one end connected to the telescopic needle sleeve fixing member 7 and the other end connected to the sliding block 2; the second compression spring is accommodated in the annular inner cavity of the spring sleeve 17;

[0063] The trigger mechanism of the needle sleeve driving member, such as Figure 5 shown, includes: a guiding slide rail 8 provided on the slider supporting member 1, and a guiding portion 9 provided on the telescopic needle sleeve fixing member 7 and slidably arranged in the guiding slide rail 8; as Figure 1 and Figure 4 shown, the guiding slide rail 8 is provided on the slider supporting member 1, and the guiding portion 9 passes through the telescopic needle sleeve fixing member 7 and the sliding block 2 and is slidably arranged in the guiding slide rail 8. The guiding slide rail 8 includes: a first guiding track 10 for guiding the sliding block 2 and the telescopic needle sleeve fixing member 7 to slide towards the extended position, and a second guiding track 11 for guiding the telescopic needle sleeve fixing member 7 to retract in the direction opposite to the extending direction of the telescopic needle 3. The first guiding track 10 and the second guiding track 11 are arranged in parallel and are connected by an arc track 12. In addition, there are two L-shaped guiding channels 16, which are symmetrically arranged on both sides of the sliding block 2; two guiding portions 9 adapted to the L-shaped guiding channels 16 are provided on the telescopic needle sleeve fixing member 7.

[0064] In this embodiment, as Figure 10 shown, the sliding block 2 includes: a sliding block housing 19 and a sliding block cover body 20 clamped and connected to the sliding block housing 19; the sliding block cover body 20 and the sliding block housing 19 enclose a accommodating cavity for accommodating the telescopic needle sleeve fixing member 7; a limiting sleeve 21 for accommodating the end of the first compression spring is further provided on the sliding block cover body 20.

[0065] Of course, the structure of the slider supporting member 1 is not specifically limited in this embodiment. In other embodiments, the slider supporting member 1 can also be a plate-like structure, an accommodating cavity or a platform.

[0066] Of course, the setting positions of the guiding slide rail 8 and the guiding portion 9 are not specifically limited in this embodiment. In other embodiments, the trigger mechanism of the needle sleeve driving member includes: a guiding slide rail 8 provided on the telescopic needle sleeve fixing member 7, and a guiding portion 9 provided on the slider supporting member 1 and slidably arranged in the guiding slide rail 8.

[0067] Of course, the setting position and the number of the L-shaped guiding channels 16 are not specifically limited in this embodiment. In other embodiments, there is 1 L-shaped guiding channel 16, which is provided on the sliding block 2; a guiding portion 9 adapted to the L-shaped guiding channel 16 is provided on the telescopic needle sleeve fixing member 7.

[0068] Of course, the specific structure of the guiding slide rail 8 is not specifically limited in this embodiment. In other embodiments, the guiding slide rail 8 can also be a convex structure, and the guiding portion 9 is a groove clamped on the convex structure.

[0069] Of course, the structures of the slider driving component 5 and the needle sleeve driving component 6 are not specifically limited in this embodiment. In other embodiments, the slider driving component 5 and the needle sleeve driving component 6 can also be deformable and compressible rubber parts.

[0070] Of course, the structure of the sliding block 2 is not specifically limited in this embodiment. In other embodiments, the sliding block housing 19 and the sliding block cover 20 that form the sliding block 2 are adhesively connected.

[0071] Such as Figure 1 and Figure 2 shown, the operation process of the driving mechanism for the cannula retracting needle device is as follows:

[0072] When the limit on the sliding block 2 is released, the sliding block 2 slides in the direction of the extended position under the push of the slider driving component 5. In this process, the guiding portion 9 is in the transverse guiding channel 13, and the guiding portion 9 slides in the first guiding track 10, thereby driving the sliding block 2 to slide towards the above-mentioned extended position, and realizing the action of the telescopic needle sleeve 4 and the telescopic needle 3 extending together.

[0073] When the sliding block 2 slides to a preset distance, the guiding portion 9 enters the second guiding track 11 under the guidance of the guiding slide rail 8. After the guiding portion 9 enters the second guiding track 11, the guiding portion 9 will move towards the reset position under the drive of the needle sleeve driving component 6. The guiding portion 9 is connected to the telescopic needle sleeve fixing member 7, thereby driving the telescopic needle sleeve fixing member 7 to move towards the above-mentioned reset position, and further driving the telescopic needle sleeve 4 to complete the retracting action through the telescopic needle sleeve fixing member 7.

[0074] Embodiment 2

[0075] A cannula retracting needle device includes: a driving mechanism of the cannula retracting needle device, and the telescopic needle 3 and the telescopic needle sleeve 4 as Figure 8 shown. The above-mentioned cannula retracting needle device can be applied to the applicator of a blood glucose monitor as Figure 3 shown, or other fields.

[0076] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A driving mechanism of a casing return needle device, characterized in that Comprising: Slider supporting member (1); Slider block (2), which is slidably arranged on the slider supporting member (1) under drive, and a telescopic needle (3) is further arranged on the slider block (2), and a telescopic needle sleeve (4) slidably connected to the telescopic needle (3) is sleeved outside the telescopic needle (3); the telescopic needle sleeve (4) is slidably arranged on the slider block (2) through a telescopic needle sleeve fixing member (7); Slider driving member (5), driving the slider block (2) to move so that the telescopic needle sleeve (4) and the telescopic needle (3) extend out simultaneously to reach the extended position; Needle sleeve driving member (6), correspondingly arranged with the telescopic needle sleeve fixing member (7), driving the telescopic needle sleeve (4) to retract in a direction opposite to the extending direction of the telescopic needle (3) at the extended position; Needle sleeve driving member triggering mechanism, comprising: a guiding slide rail (8) arranged on one of the slider supporting member (1) and the telescopic needle sleeve fixing member (7), and a guiding portion (9) arranged on the other of the slider supporting member (1) and the telescopic needle sleeve fixing member (7) and slidably arranged in the guiding slide rail (8); the guiding slide rail (8) comprises: a first guiding track (10) for guiding the slider block (2) and the telescopic needle sleeve fixing member (7) to slide towards the extended position, and a second guiding track (11) for guiding the telescopic needle sleeve fixing member (7) to retract in a direction opposite to the extending direction of the telescopic needle (3); The first guiding track (10) and the second guiding track (11) are arranged in parallel and side by side and are connected by an arc track (12); A transverse guiding channel (13) and a longitudinal guiding channel (14) adapted to the first guiding track (10) and the second guiding track (11) are arranged on the slider block (2); the transverse guiding channel (13) and the longitudinal guiding channel (14) form an L-shaped guiding channel (16) for accommodating the guiding portion (9); A transverse guiding hole (15) arranged along the transverse direction of the slider block (2) and corresponding to the transverse guiding channel (13) is arranged on the telescopic needle sleeve fixing member (7); the guiding portion (9) has one end inserted into the guiding slide rail (8), and the other end passes through the transverse guiding hole (15) and extends into the L-shaped guiding channel (16); The telescopic needle sleeve fixing member (7) comprises: a spring sleeve (17) and extension plates (18) arranged on both sides of the spring sleeve (17); the transverse guiding channel (13) is arranged on the slider block (2); The slider driving member (5) is a first compression spring with one end connected to the slider supporting member (1) and the other end connected to the slider block (2); and / or, the needle sleeve driving member (6) is a second compression spring with one end connected to the telescopic needle sleeve fixing member (7) and the other end connected to the slider block (2).

2. The drive mechanism of the casing retraction needle device according to claim 1, characterized in that, There are two L-shaped guiding channels (16), which are symmetrically arranged on both sides of the sliding block (2); two guiding parts (9) adapted to the L-shaped guiding channels (16) are arranged on the telescopic needle sleeve fixing member (7).

3. The drive mechanism of the casing retraction needle device according to claim 1, characterized in that, The sliding block (2) includes: a sliding block outer shell (19) and a sliding block cover body (20) snap-connected to the sliding block outer shell (19); a receiving cavity for receiving the telescopic needle sleeve fixing member (7) is formed by the sliding block cover body (20) and the sliding block outer shell (19). A limiting sleeve (21) for receiving the end of the first compression spring is further arranged on the sliding block cover body (20).

4. The driving mechanism of the casing retracting needle device according to claim 1, characterized in that, The second compression spring is received in the annular inner cavity of the spring sleeve (17).

5. The drive mechanism of the casing retraction needle device according to claim 1, characterized in that, The guiding slide rail (8) is arranged on the slider supporting member (1), and the guiding part (9) passes through the telescopic needle sleeve fixing member (7) and the sliding block (2) and is slidably arranged in the guiding slide rail (8).

6. A casing retracting needle device, characterized in that, Comprising: The driving mechanism of the cannula retracting needle device according to any one of claims 1 to 5, and A telescopic needle (3) and a telescopic needle sleeve (4).

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