Lancing device with rear adjustment of penetration depth

A lancing device with rear adjustment of penetration depth includes a cap, cap holder, ejection pin and shell, wherein: the lancing device has an external and medium depth adjusting sleeve. The ejection pin is located in the medium sleeve and the external depth adjusting sleeve is sleeved outside the medium sleeve; the external sleeve connects axially and circumferentially to the shell, and a rotary locating mechanism is between the external sleeve and the shell; the medium sleeve is connected circumferentially and axially in a sliding way, and a rotary moving mechanism is between the medium the external sleeve, and the medium includes a passive impact face relative to the active impact face of the ejection pin; the external sleeve includes a manual adjusting ring outside the lancing device at the middle and rear part, and rotates to drive the medium sleeve to move axially, changing the needle tip penetration depth.

TECHNICAL FIELD

The present invention relates to the medical lancing device, especially relates to a lancing device used with the disposable lancet. The lancing device has the characteristic of rear adjustment of penetration depth.

BACKGROUND OF INVENTION

The lancing device is a blood sampling device used with the disposable lancet wherein the lancing device could be used repeatedly, but the lancet is disposable in order to avoid the cross infection. The lancing device has been developed for several decades, and the lancing device has been improved many times and it's becoming mature, and during the development of lancing device, the lancing device is designed with penetration depth adjustment mechanism to meet the demands of different blood sampling subjects of different age (such as adults and children) and different skin thickness.

On Apr. 24, 2013, Chinese Patent CN202891945U announced and authorized a utility model patent with the patent number of 2012204829392 and the title of <Painless Lancing Device>. The patent is designed with a penetration depth adjustment mechanism, and the adjusting component is an adjusting tip, which is arranged at the front of the lancing device.

On Mar. 25, 1997, U.S. Pat. No. 5,613,978 announced and authorized an invention patent with the title of <Adjustable tip for lancet device>. The patent is also designed with a penetration depth adjustment mechanism, and the adjusting component is an adjusting tip, which is arranged at the front of the lancing device.

Although the above two patent cases have provided the technical solutions to adjust the penetration depth, the adjusting components (adjustment tips) are both arranged on the caps at the front of the lancing device, which could change the adjusted penetration depth by mistake as it's necessary to dismount the adjustment tip during the installation of lancet in the actual use process. Especially for the individual use by diabetic patients, the penetration depth is generally not changed after it is determined, and the individual users don't expect to change the penetration depth by mistake in the future use (during installation of the lancet).

Therefore, it's the research subject of the present invention to solve the above problem and design a better penetration depth adjustment mechanism to eliminate the interference.

DISCLOSURE OF THE INVENTION

The present invention provides a lancing device with rear adjustment of penetration depth with the purpose to solve the problem that the installation of the lancet on the lancing device interferes with the penetration depth described in the background of invention.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a lancing device with rear adjustment of penetration depth comprises a cap, a cap holder, an ejection pin and a shell, wherein:

The cap is a sleeve type cap at the head of the lancing device, and the cap is provided with a lancing end face to contact the lancing site of human body at its front end.

The cap holder is the base used to connect and fit with the cap at the front of the lancing device, and the cap and the cap holder are fit and connected through the connection port.

The ejection pin is an ejection component capable of mounting a lancet, and the ejection pin or the lancet is provided with an active impact face.

The shell is the shell of the lancing device, and the shell and the cap holder are fixedly connected, or the shell and the cap holder are an integrative structure.

Wherein: the lancing device is provided with an external depth adjusting sleeve and a medium depth adjusting sleeve. The main bodies of the external depth adjusting sleeve and the medium depth adjusting sleeve are sleeve structures. The ejection pin is located in the medium depth adjusting sleeve and the external depth adjusting sleeve is sleeved outside the medium depth adjusting sleeve.

The external depth adjusting sleeve is connected in the circumferential direction of the lancing device relative to the shell in a rotational way and it's connected in the axial direction of the lancing device in a locating way; the external depth adjusting sleeve is provided with a manual adjusting ring, and the manual adjusting ring is a sleeve at the middle and rear of the external depth adjusting sleeve, and in the assembly state, the manual adjusting ring is exposed at the middle outside or rear outside of the lancing device, so that the user can rotate and adjust manually; between the external depth adjusting sleeve and the cap holder or shell, one is provided with a rotary locating slot, and the other is provided with a rotary locating block, and the rotary locating slots are several slots spaced on the circumferential direction of the lancing device, and the rotary locating blocks are blocks configured for the corresponding rotary locating slots, and the matching between the rotary locating slots and rotary locating blocks forms a rotary locating mechanism of the external depth adjusting sleeve in the circumferential direction of the lancing device relative to the shell.

The medium depth adjusting sleeve is connected in the circumferential direction of the lancing device relative to the shell in a locating way and it's connected in the axial direction of the lancing device in a sliding way; the medium depth adjusting sleeve is provided with a passive impact face relative to the active impact face; between the medium depth adjusting sleeve and the external depth adjusting sleeve, one is provided with a spiral groove and the other is provided with a drive block, and the drive block is a block configured for the corresponding spiral groove, and the matching of the spiral groove and the drive block forms a moving mechanism of the medium depth adjusting sleeve in the axial direction of the lancing device relative to the shell.

In the assembly state, rotate the manual adjusting ring on the external depth adjusting sleeve to drive the medium depth adjusting sleeve to move axially relative to the shell of the lancing device, so as to change the distance between the lancing end face and the passive impact face in the axial direction of the lancing device, so as to adjust the penetration depth of the needle tip.

The above described technical solution is explained as follows:1. In above described technical solution, the “front” in mentioned “front end” and “forward” refers to direction pointed by the tip of lancing device or ejection direction of lancet. The “rear” in mentioned “rear end” and “rearward” refers to the direction pointed by the tail of lancing device or the opposite direction of ejection of lancet.2. In above described technical solution, the “axial direction” refers to axial direction of the lancing device, i.e. the ejection direction connected from the tip to the tail of lancing device or anteroposterior direction. The “circumferential direction” refers to the peripheral direction of the lancing device.3. In above described technical solution, the medium depth adjusting sleeve is provided with an inner lug on the inner wall, and the passive impact face is the end face of the inner lug against the active impact face. The active impact face is arranged on the side of the ejection pin or the lancet (5) corresponding to the motion path of the passive impact face.4. In above described technical solution, the medium depth adjusting sleeve is a tubular member, and the tubular member is provided with at least two pairs of division slots at its outer edge along the transverse direction of the tubular body, and each pair of division slots is formed by the two slots spaced in the axial direction of the tubular body, and all pairs of division slots are spaced along the circumferential direction at the outer edge of the medium depth adjusting sleeve, and the opening of the slots in the circumferential direction at the outer edge of the medium depth adjusting sleeve is less than 180 degrees and the slots are on the tube walls through the medium depth adjusting sleeve in the radial direction of the tubular body, and each pair of division slots isolates the tube wall in the middle to be an elastic bridge, and the two ends of the elastic bridge are integrated with the medium depth adjusting sleeve, the arch of the elastic bridge is independent relative to the medium depth adjusting sleeve and the passive impact face is arranged on the arch or the arch extension, and it's on the lateral side where the arch or the arch extension is against the active impact face to form the buffer structure of elastic bridge. In the buffer structure of elastic bridge, the arch extension has the following two forms:

The first form is that the arch extension is an inner lug extending inward from the inner side of the arch and the passive impact face is the lateral face where the inner lug is against the active impact face, so the active impact face cooperates with the passive impact face in the inner side of the medium depth adjusting sleeve in an impact way.

The second form is that the arch extension is an outer lug extending outward from the outer side of the arch and the passive impact face is the lateral face where the outer lug is against the active impact face, so the active impact face cooperates with the passive impact face in the outer side of the medium depth adjusting sleeve in an impact way.

The design principle and technical conception of the present invention are as follows: in order to solve the existing problem of the installation of the lancet interfering with the penetration depth, the present invention separates the penetration depth adjusting mechanism from the head of the lancing device and moves it to the middle or rear part of the lancing device. At this time, in order not to affect the basic structure and layout of the original design of the lancing device, while considering the rationality, simplicity and process manufacturability of the structural design, the lancing device is designed with an external depth adjusting sleeve and a medium depth adjusting sleeve, and the ejection pin is arranged in the medium depth adjusting sleeve and the external depth adjusting sleeve is sleeved outside the medium depth adjusting sleeve, wherein the external depth adjusting sleeve is connected in the circumferential direction of the lancing device relative to the shell in a rotational way and it's connected in the axial direction of the lancing device in a locating way, and the external depth adjusting sleeve is provided with a manual adjusting ring, and in the assembly state, the manual adjusting ring is exposed at the middle outside or rear outside of the lancing device, so that the user can rotate and adjust manually, and a rotary locating mechanism is arranged between the external depth adjusting sleeve and the cap holder or the shell; the medium depth adjusting sleeve is connected in the circumferential direction of the lancing device relative to the shell in a locating way and it's connected in the axial direction of the lancing device in a sliding way, and a moving mechanism by the matching of the spiral groove and the drive block between the medium depth adjusting sleeve and the external depth adjusting sleeve, and the medium depth adjusting sleeve is provided with a passive impact face corresponding to the active impact face of the ejection pin or the lancet, and in the assembly state, rotate the manual adjusting ring to drive the medium depth adjusting sleeve to move axially relative to the shell, so as to change the distance between the lancing end face and the passive impact face in the axial direction of the lancing device, so as to adjust the penetration depth of the needle tip.

Due to the application of the above described solution, the present invention has the following advantages and effect in comparison with the prior art:1. In terms of function, the present invention can effectively separate the penetration depth adjusting mechanism from the head of the lancing device and move it to the middle or rear part of the lancing device, so as to completely solve the problem of the installation of the lancet interfering with the penetration depth.2. On the premise of keeping the original basic structure and design layout of the lancing device, the invention reasonably and effectively solves the problem of rear arrangement of penetration depth adjustment mechanism through the two sleeve structures of the external depth adjusting sleeve and the medium depth adjusting sleeve.3. The present invention reasonably arranges the rotary mechanism, moving mechanism and rotary locating mechanism required for the penetration depth adjusting mechanism in the two sleeve structures with the reasonable design, ingenious conception, outstanding substantive characteristics and significant progress.4. The invention is well-adapted, and it can not only be applied to the structure form of insert-plug connection between the cap and the cap holder through the plug-in port, but also to the structure form of threaded connection between the cap and the cap holder through the threaded port, and the structure form of the connection by the plug-in of cap and cap holder first and then through the rotary lock.5. The invention has better process manufacturability, reliable operation and convenient use, and it further improves the usability of the lancing device, and plays a positive role in the improvement and development of the lancing device.

SPECIFIC EMBODIMENT

With reference to the accompanying drawings and embodiment, the present invention will be described in detail.

Embodiment: a lancing device with rear adjustment of penetration depth

As shown inFIG.1˜3, the lancing device comprises a cap1, a cap holder2, an ejection pin6, a safety plug24, a shell7, a locking plug for ejection pin26, a press button23, a clip25, a reset spring for ejection pin28, a reset spring for unloading by cocking handle29, an ejection spring30, an unloading pin27, a medium depth adjusting sleeve9, an external depth adjusting sleeve8and a cocking handle22(seeFIG.2).

The cap1is a sleeve type cap at the head of the lancing device, and the cap1is provided with a lancing end face3to contact the lancing site of human body at its front end. The cap holder2is the base used to connect and fit with the cap1at the front of the lancing device, and the cap1and the cap holder2are fit and connected through the connection port4. In this embodiment, the connection port4is an insert-plug port (seeFIG.3), and the cap1and the cap holder2form the insert-plug connection through the insert-plug port. The ejection pin6is an ejection component capable of mounting a lancet5, and the ejection pin6is provided with an active impact face7. In this embodiment, the ejection pin7is provided with a lancet holder31at the head, used to install the lancet6and the active impact face7is arranged on the lateral face of the tail of the ejection pin6(seeFIG.9). The locking plug for ejection pin26is fitted on the ejection pin6(seeFIG.10). The ejection pin6fitted with the locking plug for ejection pin26cooperates with the press button23to form the locking and unlocking mechanism of the ejection pin6(seeFIG.11). In this embodiment, the ejection pin6and the locking plug for ejection pin26are the separate structures, but the invention is not limited to this and they can be designed to be an integrated structure (not shown in the figure). The shell17is the shell of the lancing device (seeFIG.5), and the shell17and the cap holder are connected in a fixed way, but the shell17and the cap holder2can be designed as an integrated structure. The safety plug24is fitted in a sliding channel on the cap holder2and it's used to prevent from unloading the lancet by mistake during use. Since the structure is not related to the rear adjustment of penetration depth of the invention, it will not be elaborated here. The cocking handle22is used for loading after the lancet5is installed and it's used to unload the lancet after use. The cocking handle22is connected with the unloading pin27in a fixed way (seeFIG.12).

The innovation of the present invention is to design a double sleeve type rear adjustment structure of penetration depth for a lancing device. The details are as follows:

The lancing device is provided with an external depth adjusting sleeve8(seeFIG.13) and a medium depth adjusting sleeve9(seeFIG.6). The main bodies of the external depth adjusting sleeve8and the medium depth adjusting sleeve9are sleeve structures. The ejection pin6is located in the medium depth adjusting sleeve9and the external depth adjusting sleeve8is sleeved outside the medium depth adjusting sleeve9.

The external depth adjusting sleeve8is connected in the circumferential direction of the lancing device relative to the shell17in a rotational way and it's connected in the axial direction of the lancing device in a locating way. In this embodiment, specifically: the external depth adjusting sleeve8is provided with a circular recess at the outer edge (seeFIG.13) and the shell17is provided with a protruding rib at the inner edge, and the protruding rib cooperates with the circular recess. And they can be switched, that is, the external depth adjusting sleeve8is provided with a protruding rib at the outer edge and the shell17is provided with a circular recess at the inner edge. The external depth adjusting sleeve8is provided with a manual adjusting ring10and the manual adjusting ring10is a section of sleeve at the middle and rear part of the external depth adjusting sleeve8(seeFIG.13) and in the assembly state, the manual adjusting ring10is exposed at the middle outside or rear outside of the lancing device, so that the user can rotate and adjust manually. The external depth adjusting sleeve is is provided with a rotary locating slot11(seeFIG.13) and the cap holder is provided with a rotary locating block12(seeFIG.3), and the rotary locating slots11are several slots spaced on the circumferential direction of the lancing device, and the rotary locating blocks12are blocks configured for the corresponding rotary locating slots11, and the matching between the rotary locating slots11and rotary locating blocks12forms a rotary locating mechanism of the external depth adjusting sleeve8in the circumferential direction of the lancing device relative to the shell17. The positions of rotary locating slot11and rotary locating block12can be switched, that is, the external depth adjusting sleeve is provided with a rotary locating block12and the cap holder is provided with a rotary locating slot11. Since the cap holder2and the shell17are connected in a fixed way in the assembly state, the rotary locating slot11or the rotary locating block12can be changed from being arranged on the cap holder2to being arranged on the shell17(as long as the structure allows).

The medium depth adjusting sleeve9is connected in the circumferential direction of the lancing device relative to the shell17in a locating way and it's connected in the axial direction of the lancing device in a sliding way. In this embodiment, specifically: the medium depth adjusting sleeve9is provided with a limit slot18(seeFIG.6), and the cap holder2is provided with a stopper, and the limit slot18is arranged along the lancing device in the axial direction, and the limit slot18cooperates with the stopper. The positions of limit slot18and stopper can be switched, that is, the external depth adjusting sleeve9is provided with a stopper and the cap holder2is provided with a limit slot18. Since the cap holder2and the shell17are connected in a fixed way in the assembly state, the limit slot18or the stopper can be changed from being arranged on the cap holder2to being arranged on the shell17. The medium depth adjusting sleeve9is provided with a passive impact face13relative to the active impact face7(seeFIG.7). The medium depth adjusting sleeve9is provided with a spiral groove14(seeFIG.6) and the external depth adjusting sleeve8is provided with a drive block15(seeFIG.13), and the drive block15is a block configured for the corresponding spiral groove14, and the matching of the spiral groove14and the drive block15forms a moving mechanism of the medium depth adjusting sleeve9in the axial direction of the lancing device relative to the shell17. The positions of spiral groove14and drive block15can be switched, that is, the medium depth adjusting sleeve9is provided with a drive block15and the external depth adjusting sleeve8is provided with a spiral groove14.

The medium depth adjusting sleeve9is a tubular member, and the main body structure of this tubular member is a round tube (seeFIG.6). The tubular member is provided with at least two pairs of division slots19at its outer edge along the transverse direction of the tubular body (seeFIG.6), and each pair of division slots19is formed by the two slots spaced in the axial direction of the tubular body, and all pairs of division slots19are spaced along the circumferential direction at the outer edge of the medium depth adjusting sleeve9, and the opening of the slots in the circumferential direction at the outer edge of the medium depth adjusting sleeve9is less than 180 degrees and the slots are on the tube walls through the medium depth adjusting sleeve9in the radial direction of the tubular body, and each pair of division slots19isolates the tube wall in the middle to be an elastic bridge20, and the two ends of the elastic bridge20are integrated with the medium depth adjusting sleeve9, the arch of the elastic bridge20is independent relative to the medium depth adjusting sleeve9and the passive impact face13is arranged on the arch or the arch extension, and it's on the lateral side where the arch or the arch extension is against the active impact face7to form the buffer structure of elastic bridge. In this embodiment, the arch extension is an inner lug16extending inward from the inner side of the arch (seeFIG.7) and the passive impact face13is the lateral face where the inner lug16is against the active impact face7, so the active impact face7cooperates with the passive impact face13in the inner side of the medium depth adjusting sleeve9in an impact way.

In order to better understand the relative position and relationship among the components in the invention, the lancing device of the invention is described with the use state as follows:

1. Initial Assembly State

FIG.14is the view of initial assembly state of an embodiment of lancing device of present invention. The relative position and relationship among the components in the initial assembly state can be seen fromFIG.14.

2. State with the Cap Removed

FIG.15is the view of an embodiment of lancing device of present invention with the cap removed. In the state with the cap removed, the cap1is removed, and the relative position and relationship among the other components is the same as that inFIG.14.

3. State of Lancet Installed

FIG.16is the view of an embodiment of lancing device of present invention with the lancet installed. In the state with the lancet installed, the lancet5is inserted into the lancet holder31of the ejection pin6.

4.1 State of Lancet Loaded

FIG.17is the view of an embodiment of lancing device of present invention with the lancet installed, pressed and loaded. In this state, it's only necessary to directly press the lancet5in the direction pointed by the arrow inFIG.7, and the ejection pin6compresses the ejection spring30, while the ejection pin6is locked on the press button23through the locking plug for ejection pin26and finally cover the cap1.

4.2 State of Lancet Loaded by the Cocking Handle

FIG.18is the view of an embodiment of lancing device of present invention with the lancet installed and loaded by the cocking handle. In this state, if the method of directly pressing the lancet5for loading is not used, it's possible to cover the cap1first and then pull the cocking handle22backward, and the ejection pin6compresses the ejection spring30, while the ejection pin6is locked on the press button23through the locking plug for ejection pin26.

FIG.19is the view of an embodiment of lancing device of present invention in the retracted state of the cocking handle under the reset spring for ejection pin28. At this point, the loading of the cocking handle is completed.

5. State of Adjusting the Penetration Depth

The adjustment of penetration depth could be carried out in this state and it can be adjusted in advance, and it shall be adjusted before the lancing in any case. The method of adjustment of penetration depth is: rotate the manual adjusting ring10on the external depth adjusting sleeve8, and the external depth adjusting sleeve8drives the medium depth adjusting sleeve9to move axially relative to the shell17of the lancing device through the matching of the drive block15and the spiral groove14, so as to change the distance between the lancing end face3and the passive impact face13in the axial direction of the lancing device, so as to adjust the penetration depth of the needle tip.

6. State of Pressing the Press Button

FIG.20is the view of an embodiment of lancing device of present invention when the manual adjusting ring10is rotated to a suitable setting and the press button23is pressed.FIG.22is the enlarged view of area A inFIG.20. In this state, the press button23forces the ejection pin6and locking plug for ejection pin26to unhook.

7. State of Ejection of Ejection Pin and Lancet

FIG.21is the view of an embodiment of lancing device of present invention when the ejection pin6is pushed by the ejection spring30to be in the ejection state.FIG.23is the enlarged view of area B inFIG.21. In this state, the ejection spring30pushes the ejection pin6and lancet5to eject for puncturing.

8. State of Resetting Ejection Pin

FIG.24is the view of an embodiment of lancing device of present invention when the ejection pin6is reset. In this state, the ejection pin6is reset to the normal position in the axial direction of the lancing device under the action of the reset spring for ejection pin28and ejection spring30.

9. State of Lancet Unloaded

FIG.25is the view of an embodiment of lancing device of present invention when the cap1is removed and the cocking handle22is pushed to unload the lancet5; In this state, push the cocking handle22in the direction pointed by the arrow in the figure to force the lancet5to be unloaded from lancet holder31of the ejection pin6, while the reset spring for unloading by cocking handle29is compressed.

10. State of Restoring the Initial State

FIG.26is the view of an embodiment of lancing device of present invention when it restores the initial state. In this state, the cocking handle22is reset under the action of the reset spring for unloading by cocking handle29, and then cover the cap1to restore the initial assembly state.

About the above-mentioned embodiments, the possible changes of present invention are described as follows:1. In the above embodiment, the passive impact face13is arranged on the inner lug16extending inward from the inner side of arch of the elastic bridge20of the medium depth adjusting sleeve9(seeFIG.7). The present invention is not limited to this, and the passive impact face13can also be arranged on the inner lug22extending outward from the outer side of the arch of the elastic bridge20(seeFIG.8) and the passive impact face13is the lateral face where the outer lug22is against the active impact face7, so the active impact face7cooperates with the passive impact face13in the outer side of the medium depth adjusting sleeve9in an impact way.2. In the above embodiment, the passive impact face13is arranged on the elastic bridge20of the medium depth adjusting sleeve9to form the buffer structure of elastic bridge. The present invention is not limited to this, and the buffer structure of elastic bridge is not applied, that is, the medium depth adjusting sleeve9is provided with an inner lug16on the inner wall, and the passive impact face13is the end face of the inner lug16against the active impact face7. The active impact face7is arranged on the side of the ejection pin6or the lancet5corresponding to the motion path of the passive impact face13.3. In the above embodiment, the active impact face7is arranged at the lateral face of the tail of the ejection pin6. The present invention is not limited to this, and the active impact face7can be designed on the lancet5.4. In the above embodiment, the medium depth adjusting sleeve9is a tubular member, and the main body structure of this tubular member is a round tube (seeFIG.6). The present invention is not limited to this, and besides the round tube, the section shape of the medium depth adjusting sleeve9can also be rectangle, triangle, polygonal and special shape, etc., and it can be square tube, rectangular tube, triangle tube and polygonal tube.5. In the above embodiment, the connection port4is an insert-plug port (seeFIG.3). The present invention is not limited to this, and the connection port4can be a threaded port, and the cap1and the cap holder2form a threaded connection through the threaded port. The connection port4can also be an insert-plug locking port, and the cap1and the cap holder2form an insert-plug locking connection through the insert-plug locking port.

It should be noted that the above described embodiments are only for illustration of technical concept and characteristics of present invention with purpose of making those skilled in the art understand the present invention, and thus these embodiments shall not limit the protection range of present invention. The equivalent changes or modifications according to spiritual essence of present invention shall fall in the protection scope of present invention.