CN102579057B - Safety Lancet Pen - Google Patents

Abstract

A safety blood collection pen, which consists of two parts: a pen head and a pen body. The transition groove and the deadlock groove are connected in sequence, and the elastic arm end of the shooting rod is provided with a bolt head, the front part of the bolt head is provided with a bolt tongue, and the rear part is provided with a latch hook; the width of the bolt head is larger than that of the push rod, and the sliding groove The width of the locking groove is greater than the width of the bolt head, the width of the transition groove is larger than the width of the push rod, and smaller than the width of the bolt head; the connection between the sliding groove and the transition groove forms a blocking shoulder, and the connection between the transition groove and the deadlock groove A locking shoulder is formed at the place, and the end of the push rod or/and the bolt is provided with a push-off slope. This solution associates the plug-in connection between the pen head and the pen body with the safety of using and operating the blood collection pen, and uses the plug-in structure between the pen head and the pen body to solve possible safety problems during use and operation.

Description

Safety Lancet Pen

technical field

The invention relates to a medical blood collection device, in particular to a safety blood collection pen used in conjunction with a disposable blood collection needle.

Background technique

The blood collection pen is a kind of launch device, which is usually used in conjunction with a disposable blood collection needle, wherein the blood collection pen can be reused, and the blood collection needle is only for one-time use in order to avoid cross-infection. The development of the blood collection pen has a history of several decades, and the improvement of the blood collection pen has gone through many stages. At present, the blood collection pen is moving towards a mature stage, but the safety of use in the development of the blood collection pen is still a concern of those skilled in the art .

Chinese patent CN2479917Y once announced the authorization of a utility model patent named "blood collection device". The patent discloses a blood collection pen. The operation method of the blood collection pen before use is as follows: the first step is to rotate and open the pen cover; the second step is to insert a disposable blood collection needle and unscrew the protection of the blood collection needle. cap; the third step is to rotate the cover; the fourth step is to pull the pen cover at the end of the blood collection pen to make the blood collection needle enter the locked state before launching, and it can be used. Due to the limitations of the technical level at that time, the design of this blood collection pen had a safety defect, that is, when inserting the disposable blood collection needle in the second step, a certain insertion thrust may be required, which may cause the launch mechanism to enter the pre-launch lock in advance. At this time, once the user accidentally touches the launch button, the blood collection needle will be launched immediately. This misfiring may directly cause harm to the user, so there is a potential safety hazard in terms of the design of the blood collection pen.

In order to solve the above-mentioned safety problem, Chinese patent CN101518450A discloses an invention patent application case titled "Puncture Device" afterwards. The technical solution of this patent application can ensure that when the blood collection needle is inserted, it will not enter the pre-launch locked state in advance. Only when the pen cover is closed can the pen cover at the end of the blood collection pen be pulled to make the launch mechanism enter the pre-launch lock state. This design overcomes the above-mentioned security flaws, but it brings two other problems. The first is that the structure is complex, some parts are difficult to manufacture, and the production cost increases; the second is that after the user installs the blood collection needle, when it is impossible to determine whether the blood collection needle has been installed before due to interference from other factors, the user usually opens the pen cover to carry out the test. observe. At this time, the launch mechanism will produce false launches, which will cause harm to the user if you are not careful, so there are also potential safety hazards.

Contents of the invention

The object of the present invention is to design a blood-collecting pen with good safety in use and a relatively simple structure, aiming at solving the potential safety hazards of the above-mentioned blood-collecting pen during use and operation.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a safety blood collection pen, which is composed of a pen head and a pen body. An ejection chamber is arranged inside the pen head along the axial direction, and a pinhole is provided at the front end of the ejection chamber. The body is equipped with a shooting rod and a shooting spring. The head of the shooting rod is provided with a socket for inserting a blood collection needle. The side of the pen body is provided with a trigger button. The tail of the pen body is provided with a tail handle. The front part of the pen body is provided with a second connection end corresponding to the first connection end, and its innovation lies in:

The first connection end is connected to the second connection end by plugging.

A push rod is provided on the first connection end, and the push rod protrudes from the first connection end and points to the second connection end.

Corresponding to the push rod, a section of pipe body is provided along the axial direction of the pen body on the second connecting end, and a slot is provided on the pipe wall of the pipe body facing the end of the push rod along the axial direction, and the slot penetrates the pipe wall in the radial direction of the pen body .

An elastic arm extends from the side of the shooting rod, the cantilever end of the elastic arm is provided with a bolt head, the front portion of the bolt head is provided with a bolt tongue, and the rear portion is provided with a latch hook; on the radial direction of the pen body, the width of the bolt head greater than the width of the putter.

The slot is composed of a section of sliding groove, a section of transition groove and a section of locking groove in the axial direction of the pen body. The width is greater than the width of the push rod and smaller than the width of the latch head; a blocking shoulder is formed at the junction of the sliding groove and the transition groove, and a locking shoulder is formed at the junction of the transition groove and the deadlock groove; the trigger button is located in the deadlock groove Above; the push rod or/and the end of the latch tongue is provided with a pushing slope.

When the pen tip is separated from the pen body and the shooting spring is in a free state, the latch head is located in the sliding groove. In this state, when the blood collection needle is inserted into the socket, the insertion thrust forces the latch hook at the rear of the latch head to cooperate with the blocking shoulder. Thereby preventing the latch head from sliding from the sliding groove to the locking groove; when the nib is inserted into the pen body connection, the push rod is inserted into the sliding groove and the transition groove. During the insertion process, the push rod pushes the latch head and the elastic arm to the pen The inner side of the body is bent and deformed. When the tail handle is pulled backward in this state, the shooting rod drives the latch head through the elastic arm to cross the transition groove from below and enter the locking groove, and enter the locked state before firing.

The relevant content in the above-mentioned technical scheme is explained as follows:

1. In the above scheme, the meaning of "front" in the "front end" and "front part" refers to the shooting direction of the pen tip of the blood collection pen or the blood collection needle. The meaning of "rear" in the "rear end", "rear part" and "backward" refers to the opposite direction of the pen tail of the blood collection pen or the shooting direction of the blood collection needle.

2. In the above solution, the "axis direction of the pen body" refers to the axial direction of the pen body, which is also the direction between the pen tip and the pen tail of the blood collection pen, or the front-to-back direction. The "radial direction of the pen body" refers to the diameter direction of the pen body, which is also the transverse direction of the blood collection pen.

3. In the above solution, "up" and "down" in the "upper", "upper", "lower" and "downward" are described with reference to the direction shown in FIG. 3 of the present invention. Since the blood collection device of the present invention can rotate around the axis, "up" and "down" are relative, and the direction shown in Figure 3 needs to be used as a reference.

4. In the above scheme, in order to prevent the firing mechanism of the blood collection pen from being triggered when the pen head is pulled out in the ready-to-launch state. A locking slope may be provided at the end of the locking shoulder, the locking slope faces the trigger button, and the locking slope and the pushing slope form an intersection in space. When the tail handle is pulled and returned to its original position, under the joint action of the elastic force of the shooting spring and the elastic arm, the latch tongue at the front of the latch head abuts against the locking slope formed by the locking shoulder and the end of the push rod. In the bayonet; when the trigger button is pressed, the trigger button acts on the latch head, and the latch tongue slides down along the locking slope until it is unhooked and enters the shooting state; in the locked state before firing, when the pen head is pulled out from the pen body , the push rod is then pulled out from the sliding groove and the transition groove. At this time, under the action of the elastic force of the shooting spring, the latch tongue slides upward along the locking slope to the top surface of the locking shoulder to form a locked state. In this state, the trigger button The pressing fails.

The design principle of the present invention is: in order to solve the safety problem existing in the operation process of the blood collection pen, the present invention changes the design of threaded connection between the previous pen head and the pen body to the design of plug-in connection, and the connection between the pen head and the pen body The plug-in connection of the blood collection pen is related to the safety of using and operating the blood collection pen, using the cooperation relationship between the push rod set on the pen head, the slot set on the pen body and the latch head set on the elastic arm of the shooting rod. , so as to well solve the potential safety hazards in the operation process of the blood collection pen.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages and effects compared with the prior art:

1. When the blood collection needle of the present invention is inserted into the blood collection needle, since the latch head is located in the sliding groove, when the insertion thrust drives the latch head to move backward, the latch hook at the rear of the latch head is blocked by the blocking shoulder and stops moving backward, so The launch mechanism will not enter the pre-launch locked state in advance due to the insertion thrust. Only when the pen head is inserted into the pen body and connected can the tail handle be pulled, so that the launching mechanism enters the locked state before launching, thereby solving the potential safety hazard that may exist when the blood collection pen is installed with the blood collection needle.

2. In the locked state before firing, when the nib is pulled out from the pen body, the push rod is then pulled out from the sliding groove and the transition groove. At this time, under the action of the elastic force of the shooting spring, the latch tongue is locked along the The inclined surface slides upwards to the top surface of the locking shoulder to form a locked state. In this state, the pressing of the trigger button is invalid, thereby solving the potential safety hazard of opening the pen head of the blood collection pen.

3. The present invention associates the connection between the pen head and the pen body with the safety of using and operating the blood collection pen, and uses the plug-in structure between the pen head and the pen body to solve the possible safety problems in the process of using and operating, and its technical scheme design Reasonable, ingenious in conception, simple in structure and reliable in work, it is a creative and practical safe blood collection pen.

Description of drawings

Accompanying drawing 1 is the three-dimensional view of embodiment of safety type blood collection pen of the present invention;

Accompanying drawing 2 is the three-dimensional exploded view of the safety type blood collection pen embodiment of the present invention;

Accompanying drawing 3 is the cross-sectional view of the embodiment of the safety type blood collection pen of the present invention;

Accompanying drawing 4 is a state diagram when the safety type blood collection pen of the present invention pulls out the nib;

Accompanying drawing 5 is the three-dimensional view of the adjustment ring and the push rod in the nib of the safety type blood collection pen of the present invention;

Accompanying drawing 6 is the cross-sectional view of the adjustment ring and the push rod in the nib of the safety type blood collection pen of the present invention;

Accompanying drawing 7 is the three-dimensional view of the middle sleeve and the slot in the pen body of the safety type blood collection pen of the present invention;

Accompanying drawing 8 is the enlarged view of the slot among Fig. 7;

Accompanying drawing 9 is the front view of the shooting rod and the elastic arm in the pen body of the safety type blood collection pen of the present invention;

Accompanying drawing 10 is the enlarged view of the elastic arm in Fig. 9;

Accompanying drawing 11 is the status diagram when the blood collection needle is installed in the safety type blood collection pen of the present invention;

Accompanying drawing 12 is the front view of inserting thrust to make the bolt head move backward in the sliding groove when the blood collection needle is installed;

Accompanying drawing 13 is the top view of Fig. 12;

Accompanying drawing 14 is the front view of the backward movement of the blocking shoulder blocking the latch head when the blood collection needle is installed;

Accompanying drawing 15 is the top view of Fig. 14;

Accompanying drawing 16 is the status diagram of inserting the pen head after installing the blood collection needle of the safety type blood collection pen of the present invention;

Accompanying drawing 17 is the front view that the push rod pushes the shoot rod to move backward through the bolt head when inserting the nib;

Accompanying drawing 18 is the top view of Fig. 17;

Accompanying drawing 19 is the front view that the push rod forces the latch head and the elastic arm to bend and deform inwardly of the pen body when the pen tip is inserted;

Accompanying drawing 20 is the top view of Fig. 19;

Accompanying drawing 21 is the front view that the latch head crosses the transition groove from the bottom of the transition groove and moves backward when the nib is inserted;

Accompanying drawing 22 is the top view of Fig. 21;

Accompanying drawing 23 is the front view of the latch head crossing the transition groove from the bottom of the transition groove after the nib is inserted;

Accompanying drawing 24 is the top view of Fig. 23;

Accompanying drawing 25 is the front view that when the tail handle is pulled backwards, the shoot rod drives the latch head through the elastic arm to cross the transition groove from below and enter the locking groove;

Accompanying drawing 26 is the top view of Figure 25;

Figure 27 shows that when the tail handle returns to its original position, under the joint action of the elastic force of the shooting spring and the elastic arm, the latch tongue at the front of the latch head abuts against the bayonet formed by the locking slope of the locking shoulder and the end of the push rod , and enter the main view of the locked state before launch;

Accompanying drawing 28 is the top view of Figure 27;

Accompanying drawing 29 is the state diagram of pressing and launching of the safe blood collection pen of the present invention;

Accompanying drawing 30 is the enlarged view of the state when the trigger button is pressed;

Accompanying drawing 31 is the enlarged view of the unhooked state of the latch head when the trigger button is pressed;

Accompanying drawing 32 is the state diagram when drawing out the nib in the locking state before launching;

Accompanying drawing 33 is the front view of the latch head rebounding and locked on the locking shoulder when the nib is pulled out in the locked state before launching;

Accompanying drawing 34 is the top view of Fig. 33;

Accompanying drawing 35 is the front view of the failure of pressing the trigger button after the nib is pulled out in the locked state before launch;

Accompanying drawing 36 is the plan view of Fig. 35.

In the above drawings: 1. nib; 2. pen body; 3. adjusting cap; 4. adjusting ring; 5. elastic ring; 6. adjusting inner core; 7. shooting rod; 8. shooting spring; 9. middle sleeve; 10. Trigger button; 11. Overcoat; 12. Unloading needle rod; 13. Inner sleeve; 14. Return spring; 15. Indicating sleeve; 16. Tail handle; 17. Transparent ring; 20. Second connecting end; 21. Push rod; 22. Tube body; 23. Slot; 24. Elastic arm; 25. Latch head; 26. Latch tongue; 27. Latch hook; 28. Sliding groove; 29 .Transition groove; 30. Locking groove; 31. Blocking shoulder; 32. Locking shoulder; 33. Locking slope; 34. Pushing slope; 35. Blood collection needle; 36. Socket; 37. Out of the needle hole; 38. Latch; 39. Jack.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Embodiment: safety type blood collection pen

As shown in Figures 1 to 3, the safety blood collection pen is composed of two parts: the pen head 1 and the pen body 2, wherein the pen head 1 is assembled from the following four parts: adjusting cap 3, adjusting ring 4, elastic ring 5 and Adjust the inner core 6. The three-dimensional view of these four parts is shown in Figure 1, and the assembly diagram is shown in Figure 3. In the nib 1, an ejection chamber is arranged inside the adjusting inner core 6 along the axial direction, and the front end of the ejecting chamber is provided with a pinhole 37, and the adjusting inner core 6 and the adjusting ring 4 are welded or snap-fitted, and the adjusting cap 3 and the elastic ring 5 are fixed. Fastened and fixed, the adjustment cap 3 is set on the head of the adjustment inner core 6 . When the adjustment cap 3 is rotated, the adjustment cap 3 moves axially relative to the adjustment inner core 6, thereby realizing the function of adjusting the acupuncture depth. The pen body 2 is assembled from the following twelve parts: shooting rod 7, shooting spring 8, middle cover 9, trigger button 10, outer cover 11, needle unloading lever 12, inner cover 13, return spring 14, indicator cover 15, tail Handle 16, transparent ring 17 and tail cap 18. The perspective view of these twenty parts is shown in Figure 1, and the assembly diagram is shown in Figure 3. In the pen body 2, the middle cover 9 is installed in the outer cover 11, and the front end of the middle cover 9 protrudes from the front end of the outer cover 11. The middle cover 9 and the outer cover 11 are tightly connected and fixedly connected, and the tail of the trigger button 10 is positioned on the middle cover 9. On the positioning hole, the head of the trigger button 10 is seated in the button hole provided on the side of the overcoat 11. Tail handle 16 is installed in the afterbody of overcoat 11, and relatively overcoat 11 is slidably connected, and inner sleeve 13 is fixedly connected in tail handle 16, and the afterbody of tail handle 16 is fixedly connected with transparent ring 17 and tail cap 18. Unloading needle bar 12 is slidably installed on the overcoat 11, and the needle-pushing bar of unloading needle bar 12 stretches into shooting bar 7 insides. The shooting rod 7 is installed in the middle sleeve 9 and is axially slidably connected to the middle sleeve 9. The head of the shooting rod 7 is provided with a socket 36 for inserting the blood collection needle 35, and the tail is covered with a shooting spring 8, which acts on the Between the shooting rod 7 and the middle cover 9. The return spring 14 acts between the inner sleeve 13 and the indicating sleeve 15 in the axial direction.

As shown in FIG. 4 , the rear end of the pen tip 1 is used as the first connecting end 19 , and the front part of the pen body 2 is provided with a second connecting end 20 corresponding to the first connecting end 19 . Three plugs 38 are arranged on the first connecting end 19, and three sockets 39 are arranged on the second connecting end 20 corresponding to the plug pins 38, so as to form a plug-in connection between the first connecting end 19 and the second connecting end 20. .

As shown in Figure 5 and Figure 6, in order to solve the safety problem existing in the operation process of the blood collection pen, a push rod 21 is provided on the end face of the adjustment ring 4 of the first connection end 19, and the push rod 21 is connected from the first connection end 19 protrudes and points to the second connection end 20 .

As shown in Figure 7, corresponding to the push rod 21, a section of pipe body 22 is provided on the middle sleeve 9 of the second connecting end 20 along the axial direction of the pen body 2, and the pipe body 22 faces the pipe wall at one end of the push rod 21 along the axis. A slot 23 is opened outward, and the slot 23 penetrates the tube wall radially on the pen body 2 .

As shown in Fig. 9 and Fig. 10, an elastic arm 24 extends from the side of the shooting rod 7, and the cantilever end of the elastic arm 24 is provided with a latch head 25, and the front portion of the latch head 25 is provided with a latch tongue 26, and the rear portion A latch hook 27 is provided. In the radial direction of the pen body 2 , the width of the latch head 25 is greater than that of the push rod 21 .

As shown in Figure 8 , the slot 23 is formed by sequentially connecting a section of sliding groove 28, a section of transition groove 29 and a section of locking groove 30 in the axial direction of the pen body 2. In the radial direction of the pen body 2, the sliding groove 28 and the lock The width of the dead groove 30 is larger than that of the bolt head 25 , and the width of the transition groove 29 is larger than that of the push rod 21 and smaller than the width of the bolt head 25 . A blocking shoulder 31 is formed at the junction of the sliding groove 28 and the transition groove 29, a locking shoulder 32 is formed at the junction of the transition groove 29 and the locking groove 30, and a locking slope 33 is provided at the end of the locking shoulder 32. The trigger button 10 is located above the locking slot 30 , and the locking slope 33 faces the trigger button 10 . The end of the push rod 21 and/or the latch tongue 26 is provided with a pushing slope 34 , and the pushing slope 34 intersects with the latching slope 33 in space.

The present invention is described respectively below by use state:

1. The state of installing the blood collection needle

As shown in Figure 11, when the pen tip 1 is separated from the pen body 2 and the shooting spring 8 is in a free state, the latch head 25 is located in the slide groove 28, and when the blood collection needle 35 is inserted into the socket 36 in this state, the insertion thrust The latch hook 27 at the rear of the latch head 25 is forced to cooperate with the blocking shoulder 31 , thereby preventing the latch head 25 from sliding from the sliding groove 28 to the locking groove 30 .

During the process of inserting the blood collection needle 35 , the inserting thrust makes the latch 25 move backward in the sliding groove 28 , see FIG. 12 and FIG. 13 . When the bolt head 25 moves to the rear end of the sliding groove 28, the blocking shoulder 31 blocks the bolt head 25 from continuing to move backward, thereby stopping the backward movement, see Fig. 14 and Fig. 15 . After the blood collection needle 35 is installed in place, under the action of the shooting spring 8, the bolt head 25 stretches back to the original position. After the blood collection needle 35 is installed, if the nib 1 is not plugged in, due to the blocking effect of the blocking shoulder 31, the whole blood collection pen can not pull the tail handle 16 to enter the locked state before launching. This is one of the important features embodied by the present invention in order to realize the safe use and operation.

2. Ready to launch

As shown in Figure 16, when the nib 1 is inserted into the pen body 2 for connection, the push rod 21 is then inserted into the sliding groove 28 and the transition groove 29. During the insertion process, the push rod 21 pushes the latch head 25 and the elastic arm 24 through the pushing slope 34 It bends and deforms toward the inside of the pen body 2 , and crosses the transition groove 29 from below the transition groove 29 . This process can be seen from Figures 17 to 24, wherein Figures 17 and 18 show that when the nib 1 is inserted, the push rod 21 pushes the shooter 7 to move backward through the latch head 25; Figure 19 and Figure 20 show the push rod 21 forces the latch head 25 and the elastic arm 24 to bend and deform to the inside of the pen body 2; Figure 21 and Figure 22 show that the latch head 25 crosses the transition groove 29 from below the transition groove 29 and moves backward; Figure 23 and Figure 24 show that the inserted The rear latch head 25 of the nib 1 crosses the plot of the transition groove 29 from below the transition groove 29.

In this state, when the tail handle 16 is pulled backward, the shooting rod 7 drives the latch head 25 to cross the transition groove 29 from below and enter the locking groove 30 through the elastic arm 24. When the tail handle 16 returns to its original position, the shooting spring 8 Under the joint action of the elastic force of the elastic force and the elastic force of the elastic arm 24, the latch tongue 26 at the front of the latch head 25 abuts against the bayonet formed by the locking slope 33 of the locking shoulder 32 and the end of the push rod 21, and enters the firing previous locked state. This process can be seen from Figures 25 to 28, wherein Figures 25 and 26 show that when the tail handle 16 is pulled backward, the shooter 7 drives the latch head 25 through the elastic arm 24 to enter the lock across the transition groove 29 from below. Dead slot 30; Fig. 27 and Fig. 28 represent the locked state before entering launch.

3. Launch and Return Status

As shown in FIG. 29 , when the trigger button 10 is pressed, the trigger button 10 acts on the latch head 25 , and the latch tongue 26 slides down along the locking slope 33 until it is unhooked and enters the shooting state. This process can be seen from FIG. 30 and FIG. 31 , wherein FIG. 30 shows the state when the trigger button 10 is pressed, and FIG. 31 shows the state where the latch head 25 is unhooked when the trigger button 10 is pressed. After firing, the shooting rod 7 retracts under the action of the back-moving spring 14, so that the needle point of the blood collection needle 35 will not be exposed after firing.

4. Pull out the pen tip when it is ready to launch

As shown in Figure 32, in the locked state before firing, when the nib 1 is pulled out from the pen body 2, the push rod 21 is then pulled out from the sliding groove 28 and the transition groove 29, and at this moment, under the elastic force of the shooting spring 8 Under the action, the latch tongue 26 slides upwards along the locking slope 33 to the top surface of the locking shoulder 32 to form a locked state, and in this state, the pressing of the trigger button 10 becomes invalid. This process can be seen from Figures 33 to 36, wherein Figures 33 and 34 show that the latch head 25 rebounds and locks on the locking shoulder 32 when the nib 1 is pulled out; Figures 35 and 36 show that it is pulled out The plot where the trigger button 10 fails to be pressed after the nib 1 is pressed. At this time, the whole blood collection pen is in a locked state, which is also the second important feature of the present invention in order to realize safe use and operation.

In a word, in order to realize the safe use and operation of the blood collection pen, the present invention is mainly reflected in the following two aspects:

First, when the operator inserts the blood collection needle, the insertion thrust will not make the firing mechanism of the blood collection pen enter the locked state in advance. And when the nib is not plugged in, even if the tail handle is pulled, the firing mechanism of the blood collection pen will not enter the locked state in advance. In this way, it is possible to avoid possible harm to the operator due to misoperation of the launch.

Second, when the blood collection pen is in the ready-to-launch state, if the pen tip is pulled out, the firing mechanism of the blood collection pen will not be triggered. In this case, even if the operator presses the button, the firing mechanism of the lancing device cannot be triggered. In this way, the operator can avoid the possible injury to the operator due to accidentally touching the button.

In addition, as shown in Figure 29, in order for the operator to easily recognize the state of the firing mechanism in the blood collection pen, a transparent ring 17 is provided at the tail of the pen body 2, and an indicator sleeve 15 is provided at the tail of the shooting rod 7 (marked in red), when the shooting rod 7 is in the locked state before firing, the indicator sleeve 15 is located at the position of the transparent circle 17 in the axial direction inside the pen body 2 . When the operator observes that the transparent circle 17 has a red mark, it means that the launch mechanism in the blood collection pen is in the locked state before launching; when the operator observes that the transparent circle 17 does not have a red mark, it means that the launch mechanism in the blood collection pen in a state of freedom.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (3)

1. safety blood collecting pen, formed by nib (1) and a body (2) two parts, nib (1) inside is provided with ejection chamber vertically, the front end of ejection chamber is provided with needle outlet (37), be equipped with Rhizoma Belamcandae (7) and shooting spring (8) in the body (2), Rhizoma Belamcandae (7) head is provided with the socket (36) of plug-in mounting blood taking needle (35), body (2) sidepiece is provided with trigger button (10), body (2) afterbody is provided with tail handle (16), the rear end of nib (1) is as first link (19), the front portion of body (2) is characterized in that being provided with second link (20) by first link (19):

Described first link (19) is connected with second link (20) plug;

Described first link (19) is provided with a push rod (21), and this push rod (21) stretches out and points to second link (20) from first link (19);

Corresponding described push rod (21) is axially arranged with one section body (22) at second link (a 20) upper edge body (2), body (22) offers slot (23) vertically on the tube wall of push rod (21) one ends, slot (23) radially runs through tube wall at a body (2);

The sidepiece of described Rhizoma Belamcandae (7) extends an elastic arm (24), and the cantilever end of elastic arm (24) is provided with door bolt head (25), and the front portion of door bolt head (25) is provided with a door bolt tongue (26), and the rear portion is provided with a latch dog (27); In a body (2) footpath upwards, the width of door bolt head (25) is greater than the width of push rod (21);

Described slot (23) is axially gone up at a body (2) and is connected and composed successively by one section sliding tray (28), one section lead-over groove (29) and one section locked groove (30), in a body (2) footpath upwards, the width of sliding tray (28) and locked groove (30) is greater than the width of door bolt head (25), the width of lead-over groove (29) is greater than the width of push rod (21), simultaneously less than the width of fastening head (25) with a bolt or latch; The junction of sliding tray (28) and lead-over groove (29) is formed with and stops shoulder (31), and lead-over groove (29) is formed with locked shoulder (32) with the junction of locked groove (30); Described trigger button (10) is positioned at locked groove (30) top; Described push rod (21) is declined inclined-plane (34) or/and the end of door bolt tongue (26) is provided with;

When nib (1) is separated with a body (2), and shooting spring (8) is when being in free state, door bolt head (25) is arranged in sliding tray (28), under this state during to socket (36) plug-in mounting blood taking needle (35), plug-in mounting thrust forces the latch dog (27) at door bolt head (25) rear portion to cooperate with stopping shoulder (31), thereby stops door bolt head (25) to slide from sliding tray (28) to locked groove (30); When nib (1) is inserted a body (2) connection, push rod (21) inserts sliding tray (28) and lead-over groove (29) thereupon, push rod (21) promotes door bolt head (25) and the distortion of elastic arm (24) Xiang Bishen (2) inside bend by declining inclined-plane (34) during insertion, when under this state, pulling back tail handle (16), Rhizoma Belamcandae (7) drives door bolt head (25) by elastic arm (24) and enters the locked groove (30) from below leap lead-over groove (29), and enters the lock-out state before the emission.

2. safety blood collecting pen according to claim 1, it is characterized in that: described first link (19) is provided with latch (38), to should being provided with jack (39) at second link (20) by latch (38), be connected forming plug between first link (19) and second link (20) with this.

3. safety blood collecting pen according to claim 1, it is characterized in that: described body (2) afterbody is provided with transparent circle (17), Rhizoma Belamcandae (7) afterbody is provided with indication cover (15), during lock-out state before Rhizoma Belamcandae (7) is in emission, indication cover (15) is located axially at transparent circle (17) position in a body (2) inside.

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