CN203828942U - Safety protection mechanism for blood collection pen - Google Patents

Abstract

The utility model discloses a safety protection mechanism for blood sampling pen, include a percussion unit and a change over switch, the percussion unit has a syringe needle and keeps seat and one to wear to locate the firing pole that the syringe needle kept the seat in, change over switch has a fixed external member of locating the syringe needle and keeping the seat, a rotatory external member of locating fixed external member, and a interlock external member of locating the firing pole, when rotatory external member is located a position of awaiting the fire, the syringe needle keeps the seat can drive the firing pole and up moves, the preparation of firing of going up the thorax is accomplished when accomplishing the joint with fixed external member promptly, interlock external member this moment can receive the restriction of rotatory external member and can't promote the firing pole and move back the needle, when rotatory external member is located a position of moving back, the syringe needle keeps the seat to be fixed in fixed external member and can't go up the thorax, the firing pole this moment can move back the needle operation through the promotion of interlock.

Description

Safety protection mechanism for blood collection pen

technical field

The utility model relates to a blood collection pen, in particular to a safety protection mechanism for a blood collection pen.

Background technique

In order to facilitate the collection of the subject's blood for testing, the medical staff usually use a blood collection pen to pierce a small wound on the subject's skin for blood collection. Used needles must be disposed of safely before being discarded to avoid needle stick injuries to healthcare workers or others.

As far as the current blood collection pen is concerned, since there is no protective mechanism in the structure, the medical staff is easily exposed to danger, and even the medical staff may be accidentally stabbed by the needle. For example, when the medical staff is removing the needle, if the firing action occurs due to misoperation, the medical staff will be injured immediately. For another example, when the medical staff loads the needle, if the loading action occurs due to misoperation, the medical staff will also be exposed to danger. Therefore, the safety of use of the aforementioned blood collection pen still needs to be strengthened.

Utility model content

The main purpose of this utility model is to provide a safety protection mechanism for the blood collection pen, which can ensure that the needle withdrawal operation cannot be performed during the loading and firing process, and the loading and firing operation cannot be performed during the needle withdrawal process, so as to increase the use. security.

In order to achieve the foregoing objectives, the safety protection mechanism of the present invention includes a firing unit and a switching switch. The firing unit has a needle holding seat, a firing rod, and a firing elastic member. The outer peripheral surface of the needle holding seat has a trigger portion and a first outer stop portion opposite to the trigger portion. The two sides of the needle holding seat A firing hole runs through the end, and the hole wall of the firing hole has a first inner shoulder, and the firing rod can axially displace through the firing hole of the needle holder and has a first outer shoulder. The first outer shoulder is detachably clamped to the first inner shoulder of the needle holder, so that the firing rod can pull the needle holder synchronously during the charging process, and can be held by the needle holder during the firing process. Pushing, the firing elastic member is sleeved on the firing rod and abuts against the needle holding seat with its bottom end to generate thrust for the needle holding seat; the switch has a fixed sleeve, a rotating sleeve, and a linkage A sleeve, the fixed sleeve is sleeved on the needle holder and has a bearing portion, the rotating sleeve can be rotatably sleeved on the fixed sleeve between a firing position and a needle withdrawing position, the inner circumference of the rotating sleeve The surface has a first inner stopper and a second inner stopper, the linkage sleeve is sleeved on the top end of the firing rod and abuts against the top end of the firing elastic member, and has a second outer stopper .

Preferably, the first outer stop portion of the needle holder has a notch, and when the rotary sleeve is at the ready-to-fire position, the first inner stop portion of the rotary sleeve leaves the notch of the needle holder and is in contact with the The first outer stops of the needle holder are staggered from each other, and when the rotary sleeve is at the needle withdrawing position, the first inner stop of the rotary sleeve extends into the gap of the needle holder and holds the needle The first outer stoppers of the seat are engaged with each other.

Preferably, the outer peripheral surface of the rotating sleeve has an elastic resisting portion, and when the rotating sleeve is at the ready-to-fire position, the elastic resisting portion of the rotating sleeve abuts against the trigger portion of the needle holder. Thus, when the elastic resisting portion of the rotating sleeve is subjected to an external force to force the trigger portion of the needle holding seat to break away from the supporting portion of the fixing sleeve, the needle holding seat can be activated through the elastic force of the firing elastic member. Drive the trigger rod to perform the firing action.

Preferably, the firing unit also has a set of cover, which is arranged on the top end of the firing rod and abuts against the linkage kit. Thus, the sleeve cover can pull the firing rod to load when subjected to tension, and can also push the firing rod to withdraw the needle through the linkage kit when receiving pressure.

Preferably, the top end of the firing rod protrudes out of the firing hole of the needle holding seat and has a second outer shoulder, the cover has a pushing ring, and the inner ring of the pushing ring has a second inner Shoulder, the second inner shoulder is detachably clamped to the second outer shoulder of the firing rod, the outer ring surface of the push ring has two extension arms, and the two extension arms abut against the linkage set The second outer stopper part, the pushing ring abuts against the firing rod and the linkage set, the firing unit also has an end cover and a return elastic member, the end cover is fixed on the top of the firing rod, the return elastic A piece is sleeved on the firing rod and resisted between the end cover and the ejector ring, so as to provide a restoring force to the firing rod during the loading process and the needle withdrawal process.

Preferably, the sleeve cover has a casing, the casing has a set of holes, the hole wall of the casing is provided with an inner engaging portion, the extension of the pushing ring has an outer engaging portion, and the outer engaging portion The engaging portion is engaged with the inner engaging portion of the housing.

Beneficial effects of the utility model: when the rotating sleeve is at the ready-to-fire position, the first outer stop portion of the needle holder and the first inner stop of the rotation sleeve are separated from each other, so that the needle holder The trigger part of the needle holder can abut against the supporting part of the fixed sleeve through the movement of the needle holder, so as to complete the preparation for loading and firing. Two outer stoppers, so that the firing rod cannot move down relative to the needle holder and the needle withdrawal operation cannot be performed. When the rotary sleeve is at the needle withdrawal position, the first inner stopper of the rotary sleeve is snapped on The first outer stop portion of the needle holder makes the needle holder fixed in the fixing sleeve so that the trigger portion of the needle holder cannot abut against the supporting portion of the fixing sleeve, and at this time, loading cannot be performed. At the same time, the second inner stop portion of the rotating set and the second outer stop portion of the linkage set are staggered, so that the firing rod can move down relative to the needle holding seat and the needle withdrawal operation can be performed.

Description of drawings

Fig. 1 is a perspective view of the blood collection pen using the utility model.

Fig. 2 is a three-dimensional exploded view of the blood collection pen using the utility model.

Fig. 3 is a longitudinal sectional view of the blood collection pen of the present invention, mainly showing the state that the rotating sleeve is in the ready-to-fire position.

Fig. 4 is a partial longitudinal sectional view of the blood collection pen of the present invention, mainly showing the state that the second outer stop part of the linkage set is blocked by the second inner stop part of the rotation set.

Fig. 5 is similar to Fig. 3, mainly showing the process of loading.

Fig. 6 is similar to Fig. 5, and mainly shows the state after loading is completed.

Fig. 7 is similar to Fig. 6, and mainly shows the state after firing is completed.

Fig. 8 is another longitudinal sectional view of the blood collection pen of the present invention, mainly showing the state where the rotating sleeve is at the needle withdrawing position.

FIG. 9 is similar to FIG. 4 , and mainly shows a state in which the second outer stop portion of the linkage set and the second inner stop portion of the rotation set are staggered from each other.

Fig. 10 is similar to Fig. 8, mainly showing the process of withdrawing the needle.

Symbol Description

10 Blood collection pen 12 Pen body

122 inner flange 124 switch

14 pen caps 16 needles

18 safety protection mechanism 20 firing unit

21 Needle Holder 211 Firing Holes

212 The first inner shoulder 213 The first outer stop

214 Gap 215 Trigger Department

22 firing rod 221 first outer shoulder

223 second outer shoulder 23 firing elastic

24 sets of covers 25 shells

252 sets of holes 254 inner engagement part

26 push ring 261 ring body

262 Second inner shoulder 263 Extension arm

264 Outer clamping part 27 Resetting elastic piece

28 end cap 30 toggle switch

40 fixing kit 42 holding holes

44 bearing part 50 rotation kit

51 The first inner stop part 52 The second inner stop part

P1 standby position P2 needle position

53 elastic compression part 60 linkage kit

62 end wall 64 second outer stop

Detailed ways

Please refer to FIG. 1 , the blood sampling pen 10 shown in the figure mainly includes a pen body 12 and a pen cap 14 , and the pen cap 14 is connected to the bottom of the pen body 12 . Please refer to FIG. 2 again, the safety protection mechanism 18 of the present invention includes a firing unit 20 and a switching switch 30 .

The firing unit 20 has a needle holder 21, a firing rod 22, a firing elastic member 23, and a cover 24, wherein:

Both ends of the needle holder 21 pass through a firing hole 211 for inserting and fixing a needle 16. The top of the firing hole 211 has a first inner shoulder 212 (as shown in FIG. 3 ), and the needle holder The outer peripheral surface of 21 has a first outer stop portion 213 , a notch 214 opened in the first outer stop portion 213 , and a trigger portion 215 opposite to the first outer stop portion 213 .

As shown in FIGS. 2 and 3 , the bottom end of the firing rod 22 is axially movable through the firing hole 211 of the needle holder 21 for firing the needle 16 . The top end of the firing rod 22 extends out of the firing hole 211 of the needle holder 21 and is covered with an end cap 28. In addition, the outer peripheral surface of the firing rod 22 has a first outer shoulder 221 and a first outer shoulder 221 above. The second outer shoulder 223, wherein the first outer shoulder 221 is engaged with the first inner shoulder 212 of the needle holder 21 (as shown in FIG. 3 ), so that the firing rod 22 can drive the needle when it is pulled The holder 21 moves away from the needle 16 .

The firing elastic member 23 is sheathed on the firing rod 22 and abuts against the top of the needle holder 21 with its bottom end, so as to generate thrust on the needle holder 21, so that the needle holder 21 can be The firing rod 22 is driven to move toward the direction of the needle head 16 through the engagement with the firing rod 22 .

The sleeve cover 24 has a housing 25, a pushing ring 26, and a return elastic member 27, as shown in Figures 2 and 4, the housing 25 has a set of holes 252 and is sleeved on the pen body 12 through the sleeve holes 252 The top end of the sleeve hole 252 has two opposite inner engaging parts 254; There are two opposite second inner shoulders 262, which are used to snap into the second outer shoulder 223 of the firing rod 22. In addition, two extension arms 263 are extended from the outer ring surface of the ring body 261 oppositely, and each extension arm 263 has An outer engaging portion 264 is engaged with the inner engaging portion 254 of the housing 25 through the outer engaging portion 264, so that the pushing ring 26 is fixed in the sleeve hole 252 of the housing 25; The rod 22 abuts between the ring body 261 of the ejector ring 26 and the end cover 28 to provide a reset effect on the firing rod 22 .

The switch 30 has a fixed set 40, a rotating set 50, and a linkage set 60, wherein:

The fixing sleeve 40 is fixed on the bottom of the pen body 12 and covered by the pen cap 14 . Both ends of the fixing sleeve 40 pass through a retaining hole 42 for sheathing on the needle holder 21. In addition, the outer peripheral surface of the fixing sleeve 40 has a support portion 44 for providing a support for the trigger portion 215 of the needle holder 21. The abutment effect is shown in Figure 2 and Figure 6.

The rotary sleeve 50 is rotatably sleeved on the fixed sleeve 40 and interposed between the pen body 12 and the fixed sleeve 40. The inner peripheral surface of the center of the rotary sleeve 50 has a first inner stopper 51, and the top of the rotary sleeve 50 is The inner peripheral surface has two opposite second inner stoppers 52. When the rotary sleeve 50 is at a ready-to-fire position P1, as shown in FIG. 2 and FIG. 3, the first inner stopper 51 of the rotary sleeve 50 will leave the needle The notch 214 of the holder 21 is separated from the first outer stopper 213 of the needle holder 21, so that the needle holder 21 can move up and down in the holding hole 42 of the fixed sleeve 40. When the needle position is P2, as shown in Figure 2 and Figure 8, the first inner stopper 51 of the rotary sleeve 50 will extend into the gap 214 of the needle holder 21 and contact the first outer stopper 213 of the needle holder 21. Interlocking with each other, so that the needle holder 21 cannot move up and down in the holding hole 42 of the fixing sleeve 40 . In addition, the outer peripheral surface of the rotating sleeve 50 has an elastic resisting portion 53 , and the position of the elastic resisting portion 53 corresponds to the supporting portion 44 of the fixing sleeve 40 .

The interlocking set 60 is sleeved on the firing rod 22 and leans against an inner flange 122 of the pen body 12 (as shown in FIG. 3 ), and the interlocking set 60 abuts against the top of the firing elastic member 23 through an end wall 62 and the ring body 261 (as shown in FIG. 3 ) of the pushing ring 26. In addition, the outer peripheral surface of the linkage sleeve 60 has four second outer stoppers 64 (as shown in FIG. 2 ) in pairs, each The second outer stopper 64 is interposed between the second inner stopper 52 of the rotary sleeve 50 and the extension arm 263 of the push ring 26 of the sleeve cover 24. When the rotary sleeve 50 is at the firing position P1, as shown in FIG. 4 As shown, the second outer stopper 64 of the linkage sleeve 60 will be blocked by the second inner stopper 52 of the rotation sleeve 50, so that the linkage sleeve 60 cannot move down. When the rotation sleeve 50 is at the needle withdrawal position During P2, as shown in Figure 9, the second outer stopper 64 of the interlocking set 60 will not be blocked by the second inner stopper 52 of the rotating set 50, so that the interlocking set 60 can be pushed up by the cover 24 The extension arm 263 of the ring 26 pushes down.

The above is the detailed structure of the safety protection mechanism 18 of the present invention, and the operation process of the present invention will be described below.

When starting to operate, first turn the rotating sleeve 50 to the ready-to-fire position P1 as shown in FIG. body 25, as shown in Figure 5, the sleeve cover 24 will push the reset elastic member 27 upwards through the ring body 261 of the push ring 26, the reset elastic member 27 will be squeezed and push the end cover 28 upwards at the same time, so that the firing rod 22 are driven upwards synchronously, and the firing rod 22 will be driven upwards through the clamping relationship between its first outer shoulder 221 and the first inner shoulder 212 of the needle holder 21 to push the needle to hold seat 21, at this time, because the interlocking set 60 remains still, the firing elastic member 23 will be squeezed by the upwardly moving needle holder 21, until the trigger part 215 of the needle holder 21 is engaged with the fixed sleeve 40. When the supporting part 44 is pressed, the trigger part 215 of the needle holder 21 will be pressed by the elastic pressing part 53 of the rotating sleeve 50 at the same time, as shown in Figure 6, and then the pulling force on the sleeve cover 24 can be released. The reset elastic member 27 of the cover 24 will push the push ring 26 of the sleeve cover 24 until the extension arm 263 of the push ring 26 of the sleeve cover 24 abuts against the second outer stopper 64 of the linkage kit 60, and the process is completed at this time. Loaded and ready to fire. After completing the preparatory action of loading, since the second outer stopper 64 of the linkage sleeve 60 is blocked by the second inner stopper 52 of the rotary sleeve 50, the extension arm 263 of the push ring 26 of the sleeve cover 24 is again It is engaged with the second outer stopper 64 of the linkage kit 60, as shown in FIG. After loading, the operation of withdrawing the needle cannot be performed.

When firing, press a switch 124 of the pen body 12 with your finger (as shown in FIGS. The elastic pressing part 53 will press against the bearing part 44 of the needle holder 21 again, so that the bearing part 44 of the needle holder 21 releases the clamping relationship with the trigger part 215 of the fixing sleeve 40, and the firing at this time The recovery force of the elastic member 23 will push the needle holding seat 21, and the pushed needle holding seat 21 will pass through the engagement between the first inner shoulder 212 of itself and the first outer shoulder 221 of the firing rod 22 relationship to push the firing rod 22 synchronously, as shown in FIG. 7 , so that the firing rod 22 pushes the needle 16 to complete the firing action.

After the firing is completed, it is necessary to perform the operation of withdrawing the needle. Firstly, the pen cover 14 is removed to expose the needle head 16, and then the rotating sleeve 50 is rotated to the needle withdrawal position P2 as shown in FIG. 8 , and then the needle head 16 is inserted. On a needle cover (not shown in the figure), the needle holder 21 at this time can not move up and down because of being restricted by the rotation sleeve 50, and the other linkage sleeve 60 will not be blocked by the rotation sleeve 50 ( As shown in Figure 9), so in the process of applying force to press the sleeve cover 24, the interlocking set 60 and the firing rod 22 will be pushed down through the push ring 26 at the same time, so that the firing rod 22 will push the needle 16 out of the needle holder 21 outside the firing hole 211, as shown in FIG. At this time, the needle 16 will stay on the needle cover, and the medical staff can discard the needle 16 together with the needle cover. During the process of withdrawing the aforementioned needle, because the needle holder 21 is kept in a state of snapping together with the rotating sleeve 50, as shown in FIG. 21 Pull to the loading position, so that it can be ensured that the loading operation cannot be performed during the needle withdrawal process.

To sum up, the safety protection mechanism 18 of the present utility model can ensure that the needle cannot be retracted during the process of loading and firing by setting the switch 30, and on the other hand, the needle cannot be loaded during the process of retracting the needle, so as to avoid Misoperation occurs to increase the safety of use.

Claims (7)

1. for a safety protection mechanism for blood collecting pen, it is characterized in that, include:

Blow bill unit, there is a syringe needle and keep seat, one trigger shaft, and one percussion elastic component, this syringe needle keeps the outer peripheral face of seat to have the first outer stop section of a trigger unit and relative this trigger unit, this syringe needle keeps the two ends of seat to run through a percussion hole, the hole wall in this percussion hole has one first interior shoulder, the bottom of this trigger shaft can be arranged in axially in the percussion hole that this syringe needle keeps seat and have one first outer shoulder, this first outer shoulder is connected in the first interior shoulder that this syringe needle keeps seat, this percussion elastic component is sheathed on this trigger shaft and is resisted against this syringe needle with its bottom and keeps seat, and

One change-over switch, there is a fixed sleeve part, a rotation external member, an and interlock external member, this fixed sleeve part is sheathed on this syringe needle and keeps seat and have a bearing and leaning portion, this rotation external member can be treated to be sheathed on rotationally this fixed sleeve part between firing position and a withdraw of the needle position in one, the inner peripheral surface of this rotation external member has one first interior stop section and one second interior stop section, this interlock external member is sheathed on the top of this trigger shaft and is resisted against the top of this percussion elastic component, and the outer peripheral face of this interlock external member has one second outer stop section.

2. the safety protection mechanism for blood collecting pen as claimed in claim 1; it is characterized in that; this syringe needle keeps the first outer stop section of seat to have a breach; in the time that this rotation external member is positioned at this until firing position; the first interior stop section of this rotation external member leave this syringe needle keep seat breach and and this syringe needle keep mutually staggering between the first outer stop section of seat; in the time that this rotation external member is positioned at this withdraw of the needle position, the first interior stop section of this rotation external member stretch in the breach that this syringe needle keeps seat and and this syringe needle keep clamping mutually between the first outer stop section of seat.

3. the safety protection mechanism for blood collecting pen as claimed in claim 1; it is characterized in that; the outer peripheral face of this rotation external member has an elasticity pressure section, and in the time that this rotation external member is positioned at this until firing position, the elasticity pressure section of this rotation external member is connected to the trigger unit that this syringe needle keeps seat.

4. the safety protection mechanism for blood collecting pen as claimed in claim 1, is characterized in that, this percussion unit also has a upper shield, and this cover is covered on the top of this trigger shaft and is connected to this interlock external member.

5. the safety protection mechanism for blood collecting pen as claimed in claim 4; it is characterized in that; the top of this trigger shaft is stretched out this syringe needle and is kept outside the percussion hole of seat and have one second outer shoulder; this upper shield has a pushing and withstanding ring; the inner ring surface of this pushing and withstanding ring has one second interior shoulder; this second interior shoulder is connected in the second outer shoulder of this trigger shaft separably, and the outer ring surface of this pushing and withstanding ring has two adjutages, and this two adjutage is connected to the second outer stop section of this interlock external member.

6. the safety protection mechanism for blood collecting pen as claimed in claim 5; it is characterized in that; this upper shield has a housing; this housing has a trepanning; the hole wall of this trepanning is provided with an interior holding section; the extension of this pushing and withstanding ring has an outer holding section, and this outer holding section is connected in the interior holding section of this housing.

7. the safety protection mechanism for blood collecting pen as claimed in claim 5; it is characterized in that; this percussion unit also has an end cap and a return springs, and this end cap is fixed on the top of this trigger shaft, this return springs be sheathed on this trigger shaft and be resisted against this end cap and this pushing and withstanding ring between.