WO2020204372A1

WO2020204372A1 - Safety catheter assembly

Info

Publication number: WO2020204372A1
Application number: PCT/KR2020/003155
Authority: WO
Inventors: 구홍회
Original assignee: 주식회사 덕우메디칼; 구홍회
Priority date: 2019-04-01
Filing date: 2020-03-06
Publication date: 2020-10-08
Also published as: KR102044154B1

Abstract

The present invention relates to a safety catheter assembly, which releases a locked state of a needle hub and retracts same while pulling a locking button back in a sliding manner so as to horizontally open locking links, thereby completely preventing malfunctions and remarkably increasing operation convenience.

Description

Safety catheter assembly

The present invention relates to a safety catheter assembly in which there is no malfunction at all and significantly increases the convenience of operation by releasing and retreating the locking state of the needle hub while opening the locking link to the left and right by pulling the locking button back in a sliding manner.

In general, a vascular catheter, for example an intravenous catheter, is used to administer a fluid such as saline, various drugs, and whole parenteral nutrients to a patient, or to draw blood from a patient.

The catheter assembly is for leaving a connector with a tube for a person to be treated, and provides convenience so that when a chemical solution is injected through an injection or the like, there is no need to newly penetrate the skin with a needle.

In this catheter assembly, in order to insert the tube into the body of the person to be treated, the tube is inserted into the body of the person to be treated together with a separate guide needle, and then only the guide needle is removed by retreating.

On the other hand, in the process of removing the induction needle, there is a concern that the operator or the person to be treated may be cut by the induction needle, and problems such as infection may occur.

As a conventional vascular access device 10 for solving this, it is proposed that disclosed in Patent Document 1 (US Patent No. 6,090,078).

1 to 4, the conventional blood vessel access device 10, as shown in FIGS. 1 and 3, when the locking plate 36 and the circumferential groove 78 are aligned, the locking member 32 Is raised so that the rectangular opening 42 of the locking opening 40 is disposed inside the circumferential groove 78. Since the width of the rectangular opening 42 is narrower than the diameter of the distal catheter adapter 76, the introduction needle 60 and the catheter adapter 72 are held in a compressed state against the elastic force of the coil spring 69.

After being held in a compressed state as shown in FIGS. 1 and 3, when the operator presses the trigger 34 as shown in FIGS. 2 and 4, the locking plate 36 goes down and the circular opening 41 of the locking opening 40 ), the catheter adapter 72 is aligned. Since the diameter of the circular opening 41 is larger than the diameter of the catheter adapter 72, the elastic force of the spring 69 does not resist the solder 68 of the locking plate 36 and the hub 62. Accordingly, the spring 69 presses the hub 62 so that the introduction needle 60 retracts into the housing cavity 22.

However, in Patent Document 1, the locking is released by pressing the trigger 34 exposed to the outside. When the operator holds the housing 20 during the procedure and inserts the catheter adapter 72 into the skin, the trigger 34 is The unlocking mechanism, which is easily pushed undesirably, can no longer be used if a malfunction occurs.

In addition, since the largest frictional force is acting on the component of the force in which the direction of the force that the locking plate 36 descends is at right angles to the direction of the force (elastic force) to be restored by the hollow hub 62, the needle 61 And after the hollow tube cannula 84 is inserted into a blood vessel, etc., when the trigger 34 is pressed to lower the locking plate 37, it must overcome the right-angled friction force and press the housing 20 itself to shake the blood vessel. There is a great risk of hurting them.

Another conventional safety catheter assembly 10 is proposed as disclosed in Patent Document 2 {Korean Patent Publication No. 10-1707181 (US Patent Publication No. 2018-0243539)}.

Referring to FIG. 5, in another conventional safety catheter assembly 10, when the operator advances the handle member 230 during catheter treatment, the elastic member 250 is compressed and the fixing member 240 is advanced. At this time, when the needle 220 is exposed to the outside of the catheter 100, the fixing member 240 is inserted into the first fixing hole 211, and the advanced state of the handle member 230 is maintained.

On the other hand, after inserting the catheter 100 into the person to be treated, when the operator presses the fixing member 240 inserted into the first fixing hole 211, the fixing member 240 is separated from the first fixing hole 211 , By the restoring force of the elastic member 250, the fixing member 240 and the handle member 230 are retracted together. Thereafter, when the needle 220 is not exposed to the outside and is completely inserted into the housing 210, the fixing member 240 is inserted into the second fixing hole 212, and the retracted state of the handle member 230 is maintained. .

However, in Patent Document 2, since the fixing member 240 maintains a component of force in the direction perpendicular to the first fixing hole 211, the fixing member 240 is unintentionally removed when holding the housing 210 for a procedure. Pressing may cause a malfunction, and after the insertion of the blood vessel, it is possible to injure the blood vessel by shaking the housing 210 while trying to press the fixing member 240 with a large force.

In addition, since the first and

second fixing holes

211 and 212 are perforated in the housing 210, when the handle member 230 is retracted, there is a risk of leakage of blood entering the housing 210 or external There is a high risk of foreign substances entering the blood vessels from

[Prior technical literature]

[Patent Literature]

(Patent Document 1) US Patent Publication No. 6,090,078

(Patent Document 2) Korean Patent Publication No. 10-1707181 (US Patent Publication No. 2018-0243539)

The present invention was conceived to solve the above-described problem, eliminating the fear of malfunction due to a mechanism that pulls the locking button back in a sliding manner in the same direction as the retreating direction of the needle hub, and unlocking by opening the locking link in the circumferential direction. It is an object of the present invention to provide a safety catheter assembly capable of providing a safer medical environment from infections and contaminants by minimizing the shaking of the needle compared to the right angle to increase convenience through stable and smooth operation.

In order to achieve the above object, the safety catheter assembly according to claim 1 of the present invention includes a hollow housing 310 having a housing cavity 311 penetrating back and forth, and installed at the rear side of the hollow housing 310, and the housing chamber ( A housing 300 including a cap housing 390 with 391; The catheter 400 installed on the front side of the hollow housing 310; A needle hollow hub 500 disposed inside the housing cavity 311; A coil spring 600 for retracting the needle hollow hub 500 into the chamber 391; The needle hollow hub 500 locked by the release of the compressed coil spring 600 includes a locking mechanism 700 to retreat into the housing chamber 391, and the locking mechanism 700 accommodates the link of the hollow housing 310 It is installed in the groove part 330 and slides backward while being installed in the locking rink 710 of the open cross section having the opening 715 cut in the front and rear direction, and the button mounting groove 350 of the hollow housing 310 It includes a locking button 730 to release the locking state of the needle hollow hub 500 by opening the locking link 710 to the left and right while passing through the opening 715, the locking link 710 is the left and right vertical links facing each other ( 711), and a lower connection link 712 that connects the lower side of the left and right vertical links 711, and the left and right upper links extending from the upper side of the left and right vertical links 711 toward the inside so that an opening 715 is formed in the center (713) (714) and, it is formed at the rear of the lower surface of the left and right upper links (713, 714), including a locking flange (550) of the needle hollow hub 500, including a locking hook 716, the link receiving groove 330 includes a seating groove 331 in which the lower connection link 712 is seated, and left and right side walls 333 facing each other with a left and right vertical link 711 and a space (s).

In the safety catheter assembly according to claim 2 of the present invention, an assembly inclined surface 710a inclined toward the inside is further formed on an inner edge of the rear surface of the locking link 710.

In the safety catheter assembly according to claim 3 of the present invention, a weight loss groove 717 is formed on the front side of the left and right vertical links 711, and the front and rear lengths of the left and right vertical links 711 <left and right

upper links

713, 714 Is the front and rear length of <the front and rear length of the lower connecting link 712.

In the safety catheter assembly according to claim 4 of the present invention, the locking button 730 includes a pull button 731, a slide plate 733 formed on a lower surface of the pull button 731, and a slide plate 733. ), including a wing-shaped protrusion 734 formed on the left and right sides of the slide plate 733, and an opening insertion piece 735 formed on the rear side of the slide plate 733, and the protrusion on the left and right side walls 351 of the button mounting groove 350 A slot 353 is formed in which the 734 is slidable back and forth, and the protrusion 734 is made of a right-angled triangular jaw protrusion 734a and an inclined protrusion 734b, and the front of the slide plate 733 A protruding plate 733a protruding further forward than the pull button 731 is formed on the outer circumferential surface of the assembly hole 360 of the hollow housing 310 while covering the upper surface of the protruding plate 733a while covering the catheter protection cap 800 This is more fitted and combined.

According to the present invention, there are the following effects.

With the needle hollow hub applying the locking link in a direction perpendicular to the longitudinal direction, the locking button slides backwards and unlocks the locking link in the left and right directions in the locking state, so that it does not malfunction even if the locking button is pressed during the procedure. The locking is released while passing through the opening of the locking link, so that there is no need to forcefully pull, so the convenience of operation is very excellent.

In addition, even if the locking link has the same shape as a link or a running track, and the left and right gaps occur when passing through the opening, the occupied space contacting the left and right side walls of the link receiving groove can be minimized, thereby making it compact.

In addition, by further forming an inclined assembly inclined toward the inside on the inner edge of the rear surface of the locking link, it serves as a guide that is easily inserted when the needle hollow hub is pushed in after the locking link is received and assembled in the locking receiving groove.

In addition, a weight loss groove is formed on the front side of the left and right vertical links, and the lengths of the front and rear vertical links are lengthened in the order of the left and right vertical links <left and right upper links <lower connecting links, so that the left and right elasticity in the vicinity of the opening is more easily expanded.

In addition, since the protrusion is made of a chin protrusion and an inclined protrusion, the chin protrusion prevents the protrusion from being dislodged from the slot for the slot forward, and the inclined protrusion serves as a guide when assembling the locking button by forcefully inserting it into the button mounting groove.

In addition, the protrusion plate 733a is covered while the catheter protection cap 800 is fitted to the outer circumferential surface of the assembly hole 360 of the hollow housing 310 as shown in FIG. 8 and at the same time the height of the inclined surface 731a of the pull button 731 And are arranged almost the same.

Therefore, the catheter protection cap is further fitted and coupled to the outer circumferential surface of the assembly hole of the hollow housing while covering the upper surface of the protruding plate, so that the position to pull the pull button back while the protruding plate 733a is pressed before the catheter protection cap 800 is removed. It is very convenient to handle. That is, even if an external force or impact such as opening or conveying is applied before the procedure is performed, a malfunction that is pulled back can be reliably prevented.

1 and 2 are longitudinal cross-sectional views before and after the needle is retracted as a conventional safety catheter assembly.

3 and 4 are cross-sectional views of a needle locking mechanism showing locking and unlocking positions taken along lines 3, 4-3, and 4 of FIG. 1;

Figure 5 is a flow chart of the operation of another conventional safety catheter assembly.

Figure 6 is an exploded perspective view showing a safety catheter assembly according to a preferred embodiment of the present invention.

Figure 7 is an assembled perspective view of Figure 6;

8 is a cross-sectional view taken along line 8-8 of FIG. 7;

9 is a cross-sectional view of FIG. 8 with the protective cap removed.

10 is a cross-sectional view of a state in which the needle hub of FIG. 9 is retracted.

11 and 12 are perspective views showing main parts of the locking mechanism.

13 is a cross-sectional view taken along line 13-13 of FIG. 8;

14, 15 and 16 are a front perspective view, a front view and a rear view of the locking link.

17 is a rear perspective view of the locking link.

18 and 19 are top and bottom perspective views of the locking button.

Figure 20 is a side view of Figure 18;

21 to 23 are a flow chart of the unlocking operation of the locking button and the locking link.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, but the same reference numerals are assigned to the same parts as those of the prior art, and detailed descriptions will be omitted.

6 is an exploded perspective view showing a safety catheter assembly according to a preferred embodiment of the present invention, FIG. 7 is an assembled perspective view of FIG. 6, FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 7, and FIG. 9 is 8 is a cross-sectional view with the protective cap removed, FIG. 10 is a cross-sectional view of a state in which the needle hub of FIG. 9 is retracted, FIGS. 11 and 12 are perspective views showing main parts of the locking mechanism, and FIG. 13 is 13- A cross-sectional view taken along line 13, FIGS. 14, 15 and 16 are a front perspective view, a front view, and a rear view of the locking link, FIG. 17 is a rear perspective view of the locking link, and FIGS. 18 and 19 are top surfaces of the locking button And a bottom perspective view, FIG. 20 is a side view of FIG. 18, and FIGS. 21 to 23 are flowcharts illustrating an unlocking operation of the locking button and the locking link.

6 to 8, the safety catheter assembly 200 according to the present embodiment includes a housing 300 having a housing cavity 311 and a chamber 391 therein, and a front side of the housing 300. The catheter 400 to be installed, the needle hollow hub 500 arranged inside the housing 300, the coil spring 600 for retracting the needle hollow hub 500 into the chamber 391, and a compressed coil spring It includes a locking mechanism 700 that retracts the needle hollow hub 500 into the housing chamber 391 upon release of 600.

The housing 300 includes a hollow housing 310 having a housing cavity 311 penetrating back and forth, and a cap housing 390 installed at the rear side of the hollow housing 310 and having a housing chamber 391.

A needle hollow hub 500 is disposed in the cavity 311 of the hollow housing 310.

The outer circumferential surface of the hollow housing 310 has a square shape unlike the pipe-shaped inner circumferential surface, so that it is easy for the operator to hold it by hand.

The cap housing 390 has a housing chamber 391 in the shape of a closed tube.

In addition, the cap housing 390 is inserted into the outer circumferential surface of the cap housing connection pipe 313 extending from the rear side of the hollow housing 310 to be sealed and assembled to prevent leakage and separation.

That is, as shown in FIG. 8, a fitting groove 313a is formed on the outer circumferential surface of the cap housing connector 313, and a fitting protrusion 390a that is fitted into the fitting groove 313a is formed at the front end of the cap housing 390. Is formed.

The catheter 400 includes a catheter tube 410 inserted into a blood vessel or the like, and a catheter hollow hub 430 that holds the catheter tube 410.

The catheter hollow hub 430 is inserted into the outer peripheral surface of the catheter connector 312 extending from the front side of the hollow housing 310.

The needle hollow hub 500 includes a needle 510 inserted into a blood vessel or the like, and a needle hollow holder 530 that holds the needle 510.

The needle 510 is inserted into the catheter tube 410 so that the sharp needle tip 511 is exposed to the outside.

In addition, a locking flange 550 having a large diameter is formed on the outer peripheral surface of the end of the hollow needle holder 530.

The locking flange 550 is preferably similar to the inner hollow shape of the locking link 710.

That is, it is preferable that the locking flange 550 has a shape such as a link or a running track.

In addition, a membrane 570 is provided on the locking flange 550 to function as an air filter vent to prevent leakage of blood and body fluid.

The hollow housing 310 and the needle hollow holder 530 allow the operator (medical practitioner) to accurately puncture blood vessels (to collect liquid or cells or tissues from the body by stabbing a needle in the human body), the visibility of blood flashback It is desirable to use a transparent material to increase the level.

As shown in FIGS. 8 to 10, the coil spring 600 is disposed between the locking projection 314 of the hollow housing 310 and the locking flange 550.

When the coil spring 600 is compressed as shown in FIG. 9 (locked state), the needle hollow hub 500 is advanced, and in the released state (unlocked state) as shown in FIG. 10, the needle hollow hub 500 is retracted. As a result, the needle 510 completely deviates from the catheter 400.

The locking mechanism 700 is a mechanism for retracting the needle hollow hub 500 back by maintaining (locking) or releasing (unlocking) the coil spring 600 in a compressed state.

As shown in Figs. 11 to 20, the locking mechanism 700 includes a locking link 710 that locks the needle hollow hub 500, and the locking link 710 opens when sliding backward. The needle hollow hub 500 includes a locking button 730 to be retracted.

The locking link 710 has a shape of a hollow open cross-section (a hollow open cross-section in which a part of the hollow closed cross-section is cut off) installed inside the hollow housing 310.

That is, the locking link 710 is a link (stadium track) shape of a hollow open cross-section when viewed from the front as shown in FIGS. 14 to 17, and the left and right vertical links 711 and the left and right vertical links 711 facing each other. ) And the upper left and

right links

713 and 714 extending from the upper side of the left and right vertical links 711 toward the inside so that an opening 715 which is an incision at the center is formed. , And a locking locking projection 716 formed at the rear of the lower surface of the upper left and

right links

713, 714.

Accordingly, while the outer circumferential surface of the locking flange 550 is placed on the inner circumferential surface of the locking link 710, the locking protrusion 716 is caught and the locked state is maintained.

In this locked state, when the locking button 730 slides backward and enters the opening 715 and opens, the upper left and

right links

713 and 714 are also open to the left and right, so that the locking hook 716 is also opened and the locking is released. Of course, the left and right vertical links 711 are also opened together.

In particular, when viewed from the side, as shown in FIG. 14, by placing a weight-removing groove 717 in a U shape on the front side of the left and right vertical links 711, the front and rear lengths w3 of the left and right vertical links 711 are made thin so that the left and right elasticity is good. Let's do it.

Further, the front and rear length w2 of the left and right

upper links

713 and 714 is made thinner than the front and rear length w1 of the lower connection link 712.

Therefore, the front and rear lengths of the left and right vertical links 711 <the front and rear lengths of the left and right

upper links

713 and 714 <the front and rear lengths of the lower connecting links 712 (or thicker), so that they are fitted in the link receiving groove 330 It facilitates the elastic spread of the left and right vertical links 711 and the left and right

upper links

713 and 714 with respect to the lower connection link 712.

In addition, when the link (land track) shape or the left and right vertical links 711 are vertically opened, they are prevented from reaching the left and right side walls 333 of the link receiving groove 330 formed in the hollow housing 310 and not sufficiently open. And it can be made compact in size. For example, in the case of a C-shaped link, if it opens and then touches the left and right side walls first and does not open anymore, the left and right side walls of the link receiving groove must be wider. In this case, the size of the hollow housing increases due to the expansion of the occupied space.

On the other hand, as shown in FIGS. 17 and 16, an assembly inclined surface 710a inclined (chamfered) toward the inside is formed at the inner edge of the rear surface of the locking link 710.

That is, the assembly inclined surface 710a is very similar to a funnel shape whose diameter decreases from the rear to the front.

As shown in FIG. 21, the inclined assembly 710a serves as a guide surface when the locking flange 550 is pushed forward in a contacted state and assembled.

That is, if the locking link 700 is accommodated in the link receiving groove 330 of the hollow housing 310 and the locking flange 550 is pushed forward continuously as shown in FIG. 21 while riding the assembly inclined surface 710a Assembly is completed when the locking link 710 is opened and passed.

As shown in FIGS. 21 to 23, the opening 715 extends from the rear end of the funnel-shaped introduction guide opening 715a and the funnel-shaped introduction guide part 715a, which gradually narrows toward the rear when viewed from the top. It consists of a straight opening 715b.

The locking link 710 is inserted and received in the link receiving groove 330 formed in the transverse direction of the hollow housing 310 as shown in FIGS. 11 to 13.

As shown in FIG. 13, the link receiving groove 330 has a seating groove 331 in which the lower connection link 712 is seated, and the left and right side walls 333 facing each other with a space (s) with the left and right vertical links 711. ).

The space s is an allowable space in which the left and right vertical links 711 and the left and right

upper links

713 and 714 can be opened.

The locking button 730 includes a pull button 731, a slide plate 733 formed on the lower surface of the pull button 731, and an opening insertion piece 735 formed on the rear side of the slide plate 733. Include.

Wing-shaped protrusions 734 are formed on the left and right sides of the slide plate 733.

A button mounting groove 350 into which the locking button 730 is slidably mounted is formed on the upper surface of the hollow housing 310.

Button mounting groove 350 is composed of a front button mounting groove (350a) and a rear button mounting groove (350b) around the link receiving groove (330).

Slots 353 are formed in the left and right side walls 351 of the front button mounting groove 350a in the front and rear longitudinal direction.

The protrusion 734 is slidably fitted in the slot 353.

The protrusion 734 has an isosceles triangle shape and includes a jaw protrusion 734a and an inclined protrusion 734b.

The jaw protrusion 734a is a right-angled locking jaw that prevents the protrusion 734 from being separated from the slot 353 forward.

The inclined protrusion 734b serves as a guide when assembling the locking button 730 by forcefully fitting it into the button mounting groove 350.

As shown in FIG. 21, the opening insertion piece 735 is guided to the funnel-shaped introduction guide opening 715a and disposed on the straight opening 715b, the non-operating opening insertion piece 735a, and the straight opening 715b. It consists of an operation opening insertion piece (735b) to open the locking link (710) while passing through.

That is, the width of the straight opening 715b is smaller than the width of the operating opening insertion piece 735b, and a funnel-shaped inclined surface 735c is formed between the operating opening insertion piece 735b and the non-operating opening insertion piece 735a. Is preferable.

This opening inserting piece 735 is opened to the left and right while passing through the opening 715 of the locking link 710 while the locking button 730 is pulled back as shown in FIGS. 21 to 23, so that the locking flange 550 as shown in FIG. 23 As shown in FIG. 10, while being away from the locking locking jaw 716, it is retracted back by the elastic force.

The pull button 731 is disposed on the top of the button mounting groove 350, and has an inclined surface 731a that is inclined toward one upper limit with respect to a right angle to be easily pulled back by holding it with an index finger on its front side.

The slide plate 733 has a protruding plate 733a protruding further forward than the inclined surface 731a of the pull button 731.

This protruding plate 733a is covered while being fitted with the catheter protection cap 800 on the outer circumferential surface of the assembly hole 360 of the hollow housing 310 as shown in FIG. 8 and is also equal to the height of the inclined surface 731a of the pull button 731 They are arranged almost the same.

Therefore, before the catheter protection cap 800 is removed, the protruding plate 733a is pressed and there is no position to pull the pull button 731 back, so that the locked state is stably maintained. In other words, it is very convenient to handle because it can reliably prevent a malfunction that is pulled back even if an external force or impact such as transport or the like is applied before the treatment is opened.

In the bottom of the rear button mounting groove (350b), as shown in Figs. 11 and 12, the link receiving groove portion 330 and the opening insertion piece allowing groove 355 to communicate with each other is formed.

The opening insertion piece allowable groove 355 is a non-operating opening insertion allowable groove (355a) and an actuating opening insertion allowable groove (355b) to allow the non-operating opening insertion piece (735a) and the working opening insertion piece (735b) to enter. Done.

As described above, in this embodiment, since the locking button 730 is pulled back to release the locking state of the locking flange 550 by opening the locking link 710, there is no fear of malfunction caused by pressing the button during the procedure. Since it is a structure that is pulled out from side to side, it has relatively less force to pull back, so the operation is very convenient.

Since the embodiments according to the concept of the present invention can apply various changes and may have various forms, the embodiments will be illustrated in the drawings and described in detail in the present specification, but this is a specific disclosure form for the embodiments according to the concept of the present invention. They are not intended to be limited to, and include all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

[Explanation of code]

200: safety catheter assembly, 300: housing

311: housing cavity, 330: link receiving groove

331: seating groove, 333: left and right side walls

350: button mounting groove, 351: left and right side walls

353: slot for groove, 360: assembly hole

390: cap housing, 391: housing chamber

400: catheter, 500: needle hollow hub

511: needle tip, 550: locking flange

570: membrane, 600: coil spring

700: locking mechanism, 710: locking link (locking rink)

710a: assembly slope, 711: left and right vertical links

712: lower connection link, 713,714: left and right upper link

715: opening, 716: locking locking jaw

717: lose weight groove, 730: locking button

731: pull button, 733: slide plate

733a: protruding plate, 734: protrusion

734a: jaw protrusion, 734b: oblique protrusion

735: opening insertion piece, 800: catheter protection cap

Claims

A housing 300 including a hollow housing 310 having a housing cavity 311 penetrating back and forth, and a cap housing 390 installed at the rear side of the hollow housing 310 and having a housing chamber 391; The catheter 400 installed on the front side of the hollow housing 310; A needle hollow hub 500 disposed inside the housing cavity 311; A coil spring 600 for retracting the needle hollow hub 500 into the chamber 391; Including a locking mechanism 700 for retracting the needle hollow hub 500 locked by the release of the compressed coil spring 600 into the housing chamber 391,

The locking mechanism 700 is installed in the link receiving groove 330 of the hollow housing 310 and has an opening 715 cut in the front-rear direction, a locking link 710 of an open cross section, and a hollow housing 310 It includes a locking button 730 for releasing the locking state of the needle hollow hub 500 by opening the locking link 710 to the left and right while sliding backward while being installed in the button mounting groove 350 of). ,

The locking link 710 includes left and right vertical links 711 facing each other, a lower connection link 712 connecting the lower side of the left and right vertical links 711, and left and right vertical links 711 so that an opening 715 is formed in the center. ) Is formed at the rear of the lower left and right upper links 713, 714, and the lower left and right upper links 713, 714 extending toward the inside from each of the upper sides of the needle, and the locking flange 550 of the hollow needle 500 is caught. Including a locking hook 716,

Link receiving groove 330 is a safety catheter assembly comprising a seating groove 331 in which the lower connection link 712 is seated, and left and right side walls 333 facing each other with a left and right vertical link 711 and a space (s).
The method according to claim 1,

A safety catheter assembly in which an assembly inclined surface 710a inclined toward the inside is further formed on the inner edge of the rear surface of the locking link 710.
The method according to claim 2,

In the front of the left and right vertical links 711, a weight loss groove 717 is formed,

A safety catheter assembly that is the front and rear length of the left and right vertical links 711 <the front and rear length of the left and right upper links 713 and 714 <the front and rear length of the lower connecting link 712.
The method according to any one of claims 1 to 3,

The locking button 730 includes a pull button 731, a slide plate 733 formed on a lower surface of the pull button 731, and a wing-shaped protrusion 734 formed on the left and right sides of the slide plate 733. ), and an opening insertion piece 735 formed on the rear side of the slide plate 733,

The left and right side walls 351 of the button mounting groove 350 are formed with slots 353 for slots into which the protrusions 734 are slidable back and forth,

The protrusion 734 is made of a right-angled triangular jaw protrusion 734a and an inclined protrusion 734b,

In front of the slide plate 733, a protruding plate 733a protruding further forward than the pull button 731 is formed,

A safety catheter assembly in which a catheter protection cap 800 is further inserted and coupled to the outer peripheral surface of the assembly hole 360 of the hollow housing 310 while covering the upper surface of the protruding plate 733a.