WO2014032299A1

WO2014032299A1 - Needle seat assembly for syringe-type vacuum blood collector

Info

Publication number: WO2014032299A1
Application number: PCT/CN2012/080901
Authority: WO
Inventors: 张建铭
Original assignee: Zhang Jianming
Priority date: 2012-09-03
Filing date: 2012-09-03
Publication date: 2014-03-06
Also published as: CN104470437B; CN104470437A

Abstract

A needle seat assembly for a syringe-type vacuum blood collector comprises a vascular puncturing needle (11), a puncturing needle seat (13), a blood collection needle tube (12), a blood collection needle seat (14), and a soft connection tube (15). The puncturing needle seat (13) is positioned at a front end of a chamber in a syringe (3) of the vacuum blood collector, the blood collection needle seat (14) is fixedly connected with the syringe (3), and a rear end of the blood collection needle tube (12) and most part of the needle tube extend backwards and are interposed in a tube plug of a blood sample collection tube (2) of the syringe (3). One end of the soft connection tube (15) is fixedly connected with the puncturing needle seat (13), the other end is fixedly connected with the blood collection needle seat (14), and the core of the soft connection tube (15), as a sealed chamber, is in communication with a cavity of the puncturing needle seat (13) and a cavity (142) of the blood collection needle seat (14). When the operation of inserting the blood sample collection tube (2) into the syringe (3) is performed, an operating force transferred from the blood sample collection tube (2) is transferred to the syringe (3) through the blood collection needle seat (14) because the blood collection needle seat (14) is fixedly connected with the syringe (3). The flexibility of the soft connection tube (15) ensures that the operating force is not transferred to the puncturing needle seat (13) or the vascular puncturing needle (11). As a result, the operating force transferred from the blood sample collection tube (2) does not pose any impact on the vascular puncturing needle (11).

Description

Needle holder assembly for syringe vacuum blood collection device

技术领域Technical field

The invention relates to a human external vacuum blood collection device for clinical medical treatment, in particular to a needle seat assembly of a syringe vacuum blood collection device.

背景技术 Background technique

A syringe type vacuum blood collection device in the prior art is shown in Fig. 1 and Fig. 2, and includes a blood vessel needle 11 and a blood collection tube 12 a blood sample collection tube 2 and a syringe 3 having a sealed chamber 16 and a cylindrical cavity 31 therein, wherein the sealed chamber 16 is located in front of the cylindrical cavity 31. Puncture needle 11 It is fixed on the front wall of the sealing cavity, and its die is in communication with the sealing cavity 16. The front end of the blood collection needle 12 is fixed on the rear wall of the sealing chamber, and the rear end and the needle tube are mostly extended rearward and inserted in the blood sample collection tube 2 In the plug, the die of the blood collection needle 12 is in communication with the sealed chamber 16. The cylindrical cavity 31 is located behind the sealed chamber and its rear end is open, the blood sample collection tube 2 The plug is previously placed in the cylindrical cavity 31 in a removable manner. The blood sample collection tube plug rear end wall has a sealing layer 21 pierceable by the rear end of the blood collection needle tube 12, the blood sample collection tube 2 The cylindrical cavity 31 of the front end face has a space for accommodating the blood sample collection tube that is pushed forward by piercing the sealing layer. Vascular puncture needle wick, sealed cavity 16, lancet tube die, and pierced sealing layer 21 The blood sample collection tube lumen forms a blood channel.

Here, the sealed chamber wall serves as both the puncture needle holder 13 and the blood collection needle holder 14, the puncture needle tube 11 and the blood collection needle tube 12 Further, they are respectively connected to the front and rear walls thereof. Therefore, the puncture needle holder 13, the blood collection needle holder 14, the sealing chamber 16, the puncture needle tube 11, and the blood collection needle tube 12 constitute a needle holder assembly.

Since the sealed chamber wall acts both as a puncture needle holder 13 and as a blood collection needle holder 14 At the same time, it is necessary to have an empty shell shape around, and such a structure must be completed in the narrow space of the inner cavity of the syringe, which is bound to bring about a problem of poor assembly process.

The second disadvantage of the prior art is that the needle hub assembly that is not fixed to the syringe and is vacant in the cavity of the syringe is prone to oscillation during operation, which not only affects the stability of the operation but also oscillates the puncture needle tube. It is easy to cause puncture failure. What is important is that when the blood sample collection tube is screwed into the inner cavity of the syringe, the spiral resistance generated by the piercing of the sealing layer at the rear end of the blood collection needle will misplace the entire needle assembly and even directly damage the entire needle assembly. .

发明内容 Summary of the invention

The object of the present invention is to overcome the deficiencies in the prior art, and to provide a simplified structure and better assembly process. A needle holder assembly for a syringe vacuum blood collection device, and a further object of the present invention is to provide a needle hub assembly for a syringe vacuum blood collection device that is relatively rigidly coupled to the syringe while being free to move relative to the syringe.

The object of the present invention is achieved by the following route.

Needle holder assembly for a syringe vacuum blood collection device, the syringe vacuum blood collection device The utility model comprises a vascular puncture needle, a puncture needle seat, a blood collection needle tube, a blood collection needle holder, a blood sample collection tube and a syringe. The syringe barrel has a sealed cavity and a cylindrical cavity, and the rear end of the blood collection needle tube and the needle tube are mostly oriented. After extending and interposing in the plug of the blood sample collection tube, the cylindrical cavity is located behind the sealed chamber and the rear end thereof is open, and the blood sample collection tube is plugged in front of the tube in a removable manner In the shaped cavity, the rear end wall of the blood sample collection tube plug has a sealing layer pierceable by the rear end of the blood collection needle , The cylindrical cavity on the front end face of the blood sample collection tube has a space for accommodating the blood sample collection tube that is pushed forward by the piercing of the sealing layer, and the puncture needle tube die, the sealing cavity, the blood collection needle tube die, and the pierced sealing layer The blood sample collection tube lumen forms a blood passage, the puncture needle tube, the puncture needle seat inserted into the puncture needle tube, the sealing chamber, the blood collection needle tube and the blood collection needle holder inserted into the blood collection needle tube constitute a needle seat assembly, and the composition thereof The main point is that the needle seat assembly further comprises a soft connecting tube, the puncture needle seat is located at the front end of the inner cavity of the syringe, one end of the soft connecting tube is fixedly connected with the puncture needle seat, the other end is fixed with the blood collecting needle seat, and the blood collecting needle seat is The syringe is fixed, and the soft connecting tube core is connected to the puncture needle chamber channel and the blood collecting needle chamber channel as a sealed cavity.

In this way, the empty shell-shaped sealing chamber wall is replaced by a soft connecting tube, and the assembly operation of surrounding the sealing chamber wall is not required, the structure is simplified, the assembly operation is simplified, and the implementation is easy.

When the blood collection needle holder is fixed to the syringe, when the operation of the blood sample collection tube into the cylindrical cavity is performed, the operation force transmitted from the blood sample collection tube is transmitted to the syringe through the blood collection needle holder, and the soft connection is performed. The flexibility of the tube ensures that the operating force is not transmitted to the puncture needle hub and the puncture needle, thereby ensuring that the operational force transmitted from the blood sample collection tube does not affect the puncture needle.

The object of the present invention can also be achieved by the following means.

There are many ways to connect the puncture hub to the syringe. The following two connections determine whether the puncture needle can be retracted into the lumen of the syringe:

One is:

The puncture needle holder is fixed in the inner cavity of the syringe.

At this time, when the puncture needle is withdrawn from the human body, the puncture needle is retracted together with the syringe because the puncture needle is fixed relative to the syringe.

The other is:

The puncture needle hub is mounted in the inner cavity of the syringe in a manner movable relative to the syringe, and the inner cavity of the syringe has a space for accommodating the retracting needle into the cavity, and the needle seat assembly further comprises a needle pusher, the syringe and the syringe The corresponding side wall of the puncture needle holder has a sliding groove extending axially, and the needle seat pushing hand on the outer side wall of the needle barrel is fixedly connected with the puncture needle seat through the cross handle thereof, and the soft connecting tube has the needle retracted into the needle with the puncture needle tube The stroke in the barrel matches the extension length.

In this way, when the puncture needle is removed from the human body, it is only necessary to push the needle holder backwards, and the puncture needle is driven by the transverse handle and the puncture needle seat, so that the retracted puncture needle is retracted into the inner cavity of the syringe. At this time, soft The connecting tube will be stretched slowly and its matching extension length will ensure that the puncture needle is retracted into the lumen of the syringe.

This technical solution produces an unexpected effect: when the puncture needle is withdrawn from the human body, it does not have to be linked with the blood sample collection tube, but is retracted separately from the blood sample collection tube, thereby making the retraction operation of the puncture needle tube more complete. Lightweight and free from the cumbersome blood collection tubes.

There are several options for the connection between the soft connecting tube and the puncture needle holder and the blood collection needle holder. The following are the better ones:

a soft connecting tube connecting seat protrudes upwardly from the upper side wall of the puncture needle seat, and a soft connecting tube connecting seat protrudes upward from the upper side wall of the blood collecting needle seat, and both ends of the soft connecting tube are top-down and Corresponding connector socket connection;

The left side wall of the puncture needle seat opposite to the horizontal shank protrudes to the left with a soft connecting tube connecting seat, and the left side wall of the blood collecting needle seat protrudes to the left with a soft connecting tube connecting seat, and the soft connecting tube ends Both are connected to the corresponding connector sockets.

The specific configuration of the blood collection needle holder is as follows:

The blood collection needle holder is located at a central portion of the inner cavity of the syringe, and the front end thereof is fixedly or integrally formed with the front end of the syringe barrel, and the rear end thereof extends in parallel along the axis line of the needle cylinder.

The blood collection needle holder has a columnar shape, and a portion connected to the soft connecting tube is located on the columnar side wall, and the soft connecting tube is wound around the barrel inner cavity of the columnar blood collecting needle holder.

The front end of the columnar blood collection needle holder has a positioning key, and the positioning key is inserted into the positioning key groove of the front wall of the barrel inner cavity.

This configuration can locate the position of the soft connecting tube connector on the blood collection needle holder.

The posterior outer wall of the cylindrical blood collection needle hub is internally threaded and the thread is matched to the internal thread connection of the blood sample collection tube plug.

The soft connecting tube is either a smooth hose or a serpentine hose.

The inner side wall of the needle pusher has an arc shape corresponding to the outer peripheral wall of the syringe, and the outer side wall of the needle pusher has a concave arc shape corresponding to the face of the finger, and the concave curved surface is knurled.

In this way, the needle pusher can be attached to the outside of the syringe more compactly, and the concave curved surface of the knurl can obtain a better touch.

One end of the horizontal handle is fixed or integrally formed with the puncture needle seat, and the other end has a positioning key shape, and the end is provided with a barbed buckle, and the end crosses the sliding groove and is positioned on the inner side wall of the needle pusher. Keyway and card slot snap connection.

Non-circular sections can be used as positioning keys.

In summary, the present invention has the following advantages over the prior art: the blood collection needle holder is fixed to the syringe, and when the blood sample collection tube is placed into the cylindrical cavity, the blood sample collection tube is transferred from the blood sample collection tube. The operation force is transmitted to the syringe through the blood collection needle holder, and the flexibility of the soft connection tube ensures that the operation force is not transmitted to the needle holder and the puncture needle tube, thereby ensuring that the operation force transmitted from the blood sample collection tube does not affect Puncture the needle.

附图说明 DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic front view showing the structure of a syringe type vacuum blood collection tube in the prior art.

Fig. 2 is a schematic view showing the state in which the blood sample collection tube of the syringe type vacuum blood collection tube is withdrawn in the prior art.

Fig. 3 is a schematic front view showing the structure of a syringe type vacuum blood collection device according to a first embodiment of the present invention.

Fig. 4 is a perspective view showing the appearance of a syringe type vacuum blood collection device according to a first embodiment of the present invention.

Fig. 5 is a schematic perspective view showing the structure of a needle hub assembly of a syringe type vacuum blood collection device according to a first embodiment of the present invention.

Fig. 6 is a schematic perspective view showing the structure of a blood collection needle holder in the first embodiment of the present invention.

Figure 7 is a schematic cross-sectional view showing the structure of a blood collection needle holder in the first embodiment of the present invention.

Figure 8 is a schematic cross-sectional front view showing the structure of a syringe in the first embodiment of the present invention.

Figure 9 is a schematic cross-sectional left side view showing the structure of the syringe in the first embodiment of the present invention.

Figure 10 is a schematic perspective view showing the structure of a syringe in the first embodiment of the present invention.

Fig. 11 is a perspective view showing the connection of the puncture needle holder, the cross handle and the needle holder according to the first embodiment of the present invention.

Figure 12 is a schematic cross-sectional front view showing the structure of a syringe type vacuum blood collection device according to a second embodiment of the present invention.

The present invention will be described in more detail below with reference to the accompanying drawings.

Label description:

11 puncture needle 12 blood collection needle 13 puncture needle holder 14 blood collection needle holder 141 positioning key 142 cavity 15 Soft connecting tube 16 Sealing chamber 17 Needle pusher 18 Cross handle 181 Buckle 2 Blood sample collection tube 21 Sealing layer 3 Needle barrel 31 Cylindrical cavity 32 Sliding groove 33 Positioning keyway 35 chute

具体实施方式detailed description

Embodiment 1:

Referring to Figures 3 and 4, a syringe vacuum blood collection device includes a needle holder assembly, a blood sample collection tube 2, and a syringe 3. Syringe 3 Is a hollow cylindrical shell made of medical transparent material, syringe 3 The front end portion has a wedge shape which is downwardly extended, and the upper end of the wedge-shaped inclined surface intersects with the outer peripheral surface of the barrel, and the downward end of the wedge-shaped inclined surface is near the outer peripheral surface of the barrel (ie, near the inner side edge of the casing) Forming a small boss with a puncture needle in the center of the boss 11 A through hole is installed, and the distal end of the puncture needle 11 is inserted into the puncture needle holder 13 in parallel with the center of the syringe 3, and the needle tip of the needle tube and most of the needle tube are exposed outside the syringe 3. Syringe 3 The interior has a sealed chamber and a cylindrical cavity 31, wherein the sealed chamber is located at the front end of the barrel, and the wick of the puncture needle 11 communicates with the sealed chamber. The blood collection needle 12 is coaxial with the cylindrical cavity 31. Blood collection needle 12 The blood collection sealing sleeve is externally coated, and the center of the blood sample collection tube plug is provided with a core hole extending axially to the sealing layer 21, and the inner diameter of the core hole is slightly larger than the outer diameter of the blood collection sealing sleeve. Thus, the blood collection needle 12 is brought with the blood collection sealing sleeve 15 When the core hole is inserted into the pipe plug, the blood collection sealing sleeve 15 is subjected to axial compression and compression, and is radially twisted and expanded and deformed, so as to be squeezed and rubbed against the inner hole wall of the core hole, and the blood collection needle 12 is not allowed to escape from the blood sample collection tube. . Cylindrical cavity 31 is located behind the sealed chamber and has a rear end open, and the blood sample collection tube 2 is plugged in the front insert sleeve in the cylindrical cavity 31, and the length of the cylindrical cavity 31 is smaller than the blood sample collection tube 2 The length of the blood sample collection tube 2 nested in the cylindrical cavity 31 is exposed outside the cylindrical cavity. Blood sample collection tube 2 The rear end wall of the tube plug has a sealing layer 21 pierceable by the rear end of the blood collection needle tube 12, The sealing layer 21 has a thickness of 1.5 mm, and the cylindrical cavity 31 of the front end surface of the blood sample collection tube 2 has a space for accommodating the sealing layer 21 and spirally pushing the blood sample collection tube 2.

Referring to Fig. 3 and Fig. 5, the needle seat assembly of the syringe type vacuum blood collection device includes a puncture needle tube 11 and an insertion connection puncture needle tube 11 The puncture needle holder 13 , the sealing chamber, the blood collection needle tube 12 , the blood collection needle holder 14 connected to the blood collection needle tube 12 , the soft connection tube 15 , the needle holder 17 and the cross handle 18 . Puncture needle holder 13 The front end portion of the inner cavity of the syringe 3 is mounted so as to be movable relative to the syringe 3. The inner cavity of the syringe 3 has a space for accommodating the puncture needle into which it is retracted. Syringe 3 and the needle holder 13 A sliding groove 32 extends along the axial direction of the corresponding side wall, and the needle pusher 17 on the outer side wall of the syringe 3 is fixed to the puncture needle holder 13 through the cross handle 18 thereof, and the soft connecting tube 15 has a puncture needle tube 11 The length of the stretch that matches the stroke in the syringe. A soft connecting tube connecting seat and a blood collecting needle seat are protruded upward from the upper side wall of the puncture needle holder 13 The upper side wall protrudes upwardly with a soft connecting pipe connecting seat, and both ends of the soft connecting pipe 15 are connected from the top to the bottom with the corresponding connecting socket. The blood collection needle holder 14 is located at the center of the inner cavity of the syringe 3, and its front end and the syringe 3 The front end is integrally constructed, and its rear end extends in parallel along the axial line of the syringe 3 . The soft connecting tube is a smooth hose.

Referring to Fig. 5, Fig. 6, and Fig. 7, the blood collection needle holder 14 has a column shape, and the front end of the columnar blood collection needle holder has a positioning key 141. The positioning button 141 is inserted into the positioning keyway 33 of the front wall of the barrel inner cavity. Columnar blood collection needle holder 14 The rear outer wall is made with external threads, and the thread is a double-ended thread that matches the internal thread connection of the blood sample collection tube plug. The blood collection needle holder 14 has a lumen 142 inside. Similarly, the needle holder 13 The inner core also has a cavity, and the soft connecting tube 15 is connected as a sealed cavity to the puncture needle hub channel and the blood collection needle hub channel 142, respectively. Thus, the puncture needle tube core, the puncture needle seat channel, the soft connection tube die, the blood collection needle holder channel 142. The blood collection needle wick and the blood sample collection tube core after being pierced by the sealing layer 21 constitute a blood passage.

Referring to Fig. 5 and Fig. 11, the inner side wall of the needle pusher 17 has an arc shape corresponding to the outer peripheral wall of the syringe, and the needle pusher 17 The outer side wall has a concave arc shape corresponding to the face of the finger, and the concave curved surface is knurled. The end of the horizontal handle 18 is integrally formed with the puncture needle holder 13, and the other end has a square shape, and the end is provided with a barb-shaped buckle 181 The end is traversed through the sliding slot 32 and is snap-fitted to the square slot and the slot 171 on the inner side wall of the needle pusher 17 .

Referring to Fig. 8, Fig. 9, and Fig. 10, a sliding groove 32 is axially extended on the syringe 3. Syringe 3 The front end portion of the inner cavity is formed with a blood collection needle holder 14 fixing hole 34 and a positioning key groove 33. The bottom of the inner cavity of the syringe has an arc-shaped chute 35 in the axial direction, and the puncture needle holder 13 The curved shape of the bottom matches the arc so that the puncture needle holder 13 is seated on the chute 35 to slide rearward.

In use, when the puncture needle 11 is withdrawn from the human body, it is only necessary to push the needle pusher 17 backwards, through the cross handle 18, and the puncture needle seat 13 The puncture needle 11 is driven to retract the retracted puncture needle 11 into the inner cavity of the syringe 3. At this time, the soft connecting tube 15 is slowly stretched, and the matching extension length ensures the puncture needle 11 Retraction into the stroke in the lumen of the syringe.

The parts not described in this embodiment are the same as the prior art.

Best embodiment:

Referring to Fig. 5 and Fig. 10, the needle seat assembly of the syringe type vacuum blood collection device is connected to the puncture needle tube 11 by the puncture needle tube 11 The puncture needle holder 13 , the sealing chamber, the blood collection needle tube 12 , the blood collection needle holder 14 connected to the blood collection needle tube 12 , and the soft connecting tube 15 are formed. Puncture needle holder 13 fixed to the syringe 3 In the inner cavity.

When in use, when the puncture needle 11 is withdrawn from the human body, pushing the syringe backward pushes the puncture needle 11 out of the human body.

This embodiment does not have the needle pusher 17 , the cross handle 18 , the sliding slot 32 , and the chute in the first embodiment. Structures such as 35 and structures that match those structures. Except for this, the parts not described in this embodiment are the same as those in the first embodiment.

Claims

a needle hub assembly of a syringe type vacuum blood collection device, the syringe type vacuum blood collection device comprising a vascular puncture needle tube, a puncture needle holder, a blood collection needle tube, a blood collection needle holder, a blood sample collection tube and a syringe, the syringe having a seal inside a cavity and a cylindrical cavity, the rear end of the blood collection needle tube and the needle tube extend mostly rearwardly and inserted into the tube plug of the blood sample collection tube, the cylindrical cavity is located behind the sealed chamber and the rear end thereof is open, the blood sample The collecting tube plug is detachably sleeved in the cylindrical cavity, and the blood sample collecting tube plug rear end wall has a sealing layer pierceable by the rear end of the blood collecting needle tube. The cylindrical cavity on the front end face of the blood sample collection tube has a space for accommodating the blood sample collection tube that is pushed forward by the piercing of the sealing layer, and the puncture needle tube die, the sealing cavity, the blood collection needle tube die, and the pierced sealing layer The blood sample collection tube lumen forms a blood passage, the puncture needle tube, the puncture needle seat inserted into the puncture needle tube, the sealing cavity, the blood collection needle tube and the blood collection needle seat inserted into the blood collection needle tube constitute a needle seat assembly, and the characteristics thereof The needle hub assembly further includes a soft connecting tube, the puncture needle seat is located at the front end of the inner cavity of the syringe, one end of the soft connecting tube is fixedly connected with the puncture needle seat, the other end is fixed with the blood collecting needle seat, and the blood collecting needle seat and the needle are The barrel is fixed, and the soft connecting tube core is connected to the puncture needle seat channel and the blood collecting needle seat channel as a sealed cavity.
A needle hub assembly for a syringe vacuum blood collection device according to claim 1, wherein the puncture needle holder is fixed in the inner cavity of the syringe.
A needle hub assembly for a syringe vacuum blood collection device according to claim 1, wherein The puncture needle hub is mounted in the inner cavity of the syringe in a manner movable relative to the syringe, and the inner cavity of the syringe has a space for accommodating the retracting needle into the cavity, and the needle seat assembly further comprises a needle pusher, the syringe and the syringe The corresponding side wall of the puncture needle holder has a sliding groove extending axially, and the needle seat pushing hand on the outer side wall of the needle barrel is fixedly connected with the puncture needle seat through the cross handle thereof, and the soft connecting tube has the needle retracted into the needle with the puncture needle tube The stroke in the barrel matches the extension length.
According to claim 1 The needle hub assembly of the syringe vacuum blood collection device is characterized in that: a soft connecting tube connecting seat protrudes upward from the upper side wall of the puncture needle seat, and the upper side wall of the blood collecting needle seat protrudes upwardly. The soft connecting tube is connected to the socket, and the ends of the soft connecting tube are connected from the top to the bottom with the corresponding connecting socket.
According to claim 1 The needle hub assembly of the syringe type vacuum blood collection device is characterized in that a soft connecting tube connecting seat protrudes to the left side of the left side wall of the puncture needle seat opposite to the horizontal shank, and the left side wall of the blood collecting needle seat There is a soft connecting pipe connecting seat to the left, and both ends of the soft connecting pipe are connected with the corresponding connecting socket.
According to claim 1 or 4 or 5 The needle hub assembly of the syringe type vacuum blood collection device is characterized in that the blood collection needle holder is located at a central portion of the inner cavity of the syringe, and the front end thereof is fixedly connected or integrally formed with the front end of the syringe barrel, and the rear end thereof is along the axis of the syringe barrel The lines extend back in parallel.
A needle hub assembly for a syringe vacuum blood collection device according to claim 1 or 4 or 5, wherein The blood collection needle holder has a columnar shape, and a portion connected to the soft connecting tube is located on the columnar side wall, and the soft connecting tube is wound around the barrel inner cavity of the columnar blood collecting needle holder.
According to claim 7 The needle hub assembly of the syringe type vacuum blood collection device is characterized in that the front end of the columnar blood collection needle holder has a positioning key, and the positioning key is inserted into the positioning key groove of the front end wall of the barrel inner cavity.
A needle hub assembly for a syringe vacuum blood collection device according to claim 7, wherein The posterior outer wall of the cylindrical blood collection needle hub is internally threaded and the thread is matched to the internal thread connection of the blood sample collection tube plug.
A needle hub assembly for a syringe vacuum blood collection device according to claim 7, wherein The soft connecting tube is either a smooth hose or a serpentine hose.
According to claim 3 The needle hub assembly of the syringe type vacuum blood collection device is characterized in that: the inner side wall of the needle holder pusher has an arc shape corresponding to the outer peripheral wall of the needle barrel, and the outer side wall of the needle holder pusher body has a shape corresponding to the finger head surface. Concave curved, knurled on this concave curved surface.
According to claim 3 The needle hub assembly of the syringe type vacuum blood collection device is characterized in that one end of the horizontal handle is fixedly connected or integrated with the puncture needle holder, the other end has a positioning key shape, and the end is provided with a barb-shaped buckle. The end is traversed through the sliding slot and is connected to the positioning keyway and the slot on the inner side wall of the needle pusher.