KR102044154B1 - safety catheter assembly - Google Patents

Abstract

The present invention relates to a safety catheter assembly, which is free of malfunctions and significantly increases the convenience of operation by pulling a locking button back in a sliding manner to release and retract the locking state of a needle hub while opening a locking link left and right.

Description

Safety catheter assembly

The present invention relates to a safety catheter assembly which has no malfunction and significantly increases the convenience of operation by releasing and retracting the locking hub of the needle hub while opening the locking link left and right by sliding the locking button back.

In general, vascular catheters, eg, intravenous catheters, are used to administer fluids such as saline, various medications, and total parenteral administration nutrients, or to draw blood from a patient.

The catheter assembly is intended to leave a tube-shaped connector for the subject, and provides convenience so that there is no need to newly penetrate the skin when injecting drug solution through injection or the like.

This catheter assembly inserts the tube into the subject's body with a separate guide needle to insert the tube into the subject's body and then retracts and removes only the guide needle.

On the other hand, in the process of removing the guide needle, the operator or the subject may suffer a wound by the guide needle, it may cause problems such as infection through.

As a conventional blood vessel access device 10 for solving this problem, one disclosed in Patent Document 1 (US Pat. No. 6,090,078) is proposed.

1 to 4, the conventional vascular 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 descends to lower the circular opening 41 of the locking opening 40. Catheter adapter 72 is aligned. Since the diameter of the circular opening 41 is larger than that 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 Literature 1, the locking is released by pressing the trigger 34 exposed to the outside. When the operator grasps the housing 20 and inserts the catheter adapter 72 into the skin during the procedure, the trigger 34 Unlocking mechanisms that are easily pressed undesirably and can no longer be used if malfunctions occur.

In addition, since the component of the force in which the direction in which the locking plate 36 descends with respect to the direction (elastic force) of the force to be restored by the hollow hub 62 is formed at right angles has the largest frictional force, the needle 61 And the hollow tube cannula 84 is inserted into the vessel, etc., when the trigger 34 is pressed down to lower the locking plate 37, the housing 20 itself, which has to be pressed and overcomes the friction force of the right angle, is shaken to open the vessel. There is a great risk of injury.

As another conventional safety catheter assembly 10, the one disclosed in Patent Document 2 (Korean Patent Publication No. 10-1707181 (US Patent Publication No. 2018-0243539)) is proposed.

Referring to FIG. 5, another conventional safety catheter assembly 10 is, when the operator advances the handle member 230 during catheterization, 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, the advanced state of the handle member 230 is maintained.

On the other hand, after the catheter 100 is inserted into the subject, 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 completely inserted into the housing 210 without being exposed to the outside, the fixing member 240 is inserted into the second fixing hole 212, and the retracted state of the handle member 230 is maintained. .

However, since Patent Document 2 also holds the component of the force in the direction perpendicular to the first fixing hole 211, the fixing member 240 unintentionally holds the fixing member 240 when holding the housing 210 for the procedure. Pressing may cause a malfunction, and after the insertion of blood vessels, the vessel may be damaged by shaking the housing 210 while pushing 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, blood or the like that may enter the housing 210 may leak or may be leaked. There is a high possibility that foreign substances enter the blood vessel from the blood vessel.

United States Patent Publication No. 6,090,078 Korean Patent Publication No. 10-1707181 (US Patent Publication No. 2018-0243539)

The present invention has been made to solve the above-mentioned problem, and eliminates the fear of malfunction due to the mechanism of pulling the locking button back in the same direction as the retraction direction of the needle hub, release the locking by opening the locking link in the circumferential direction It is an object of the present invention to provide a safety catheter assembly which can provide a safer medical environment from infection and contamination by minimizing the shaking of the needle compared to the right angle and increasing the convenience with stable and smooth operation.

In order to achieve the above object, the safety catheter assembly according to claim 1 of the present invention, the hollow housing 310 having a housing cavity 311 penetrated back and forth, and is installed on the rear side of the hollow housing 310 and the housing chamber ( A housing 300 comprising a cap housing 390 with 391; A catheter 400 installed at 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 locking mechanism 700 includes 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, wherein the locking mechanism 700 receives a link of the hollow housing 310. Sliding backward while being installed in the locking rink 710 of the open end and the button mounting groove 350 of the hollow housing 310 is installed in the groove portion 330 and has an opening 715 cut in the front and rear direction The locking link 710 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 passing through the opening 715, and the locking link 710 includes the left and right vertical links facing each other. 711, a lower link link 712 connecting the lower side of the left and right vertical links 711, and a left and right upper link extending inward from each of the upper sides of the left and right vertical links 711 so that an opening 715 is formed in the center thereof. 713 and 714 and the left and right upper links 713 and 714 are formed behind the lower surface of the needle. The locking flange 550 of the ball hub 500 includes a locking locking jaw 716, the link receiving groove 330 is a seating groove 331, the lower connection link 712 is seated, and the left and right vertical links ( 711 and the left and right sidewalls 333 facing the space s.

delete

In the safety catheter assembly according to claim 3 of the present invention, an assembly inclined surface 710a which is inclined inward is further formed at the rear inner edge of the locking link 710.

In the safety catheter assembly according to claim 4 of the present invention, the front surface of the left and right vertical links 711, the fat groove 717 is formed, the front and rear length of the left and right vertical links 711 <left and right upper links 713, 714 Is the length of the front and rear of the lower connection link 712.

In the safety catheter assembly according to claim 5 of the present invention, the locking button 730 includes a pull button 731, a slide plate 733 formed on the bottom surface of the pull button 731, and a slide plate 733. Wing projections (734) formed on the left and right sides of the) and the opening insertion piece (735) formed on the rear side of the slide plate (733), and the projections on the left and right side walls (351) of the button mounting groove (350) A slot groove 353 into which the 734 is slidably inserted back and forth is formed, and the protrusion 734 is formed of a right-angled triangular jaw protrusion 734a and an inclined protrusion 734b, and the front of the slide plate 733. The protrusion plate 733a protruding further forward than the pull button 731 is formed, and the outer circumferential surface of the assembly opening 360 of the hollow housing 310 covers the upper surface of the protrusion plate 733a, and the catheter protection cap 800 is provided. This is further fitted and combined.

According to the present invention has the following effects.

The locking button slides backward while the needle hollow hub applies the locking link in a direction perpendicular to the longitudinal direction to open and unlock in the left and right directions of the locking link, so that the locking button does not malfunction even when the locking button is pressed during the procedure. The locking is released while passing through the opening of the locking link so that it does not have to be forcibly pulled, and the operation convenience is very excellent.

In addition, even if the locking link has a shape such as a rink or a running track, when the left and right gaps occur when passing through the opening, the space occupied by the left and right side walls of the link receiving groove portion can be minimized.

In addition, the assembling inclined surface inclined inward to the inner inner edge of the locking link is further formed, so that the locking link serves as a guide that is easily inserted when the needle hollow hub is pushed from the back after being assembled to the locking receiving groove.

In addition, the front side of the left and right vertical link is formed with a weight groove, the front and rear length is made in the left and right vertical link <left and right upper link <lower connecting link in order to facilitate the left and right elastic gap in the portion near the opening.

In addition, the projections are made up of the jaw projections and the inclined projections, the jaw projections prevent the projections from being separated from the slot forward, the inclined projections serve as a guide when assembling the locking button into the button mounting groove.

In addition, the protrusion plate 733a is covered with the catheter protection cap 800 fitted to the outer circumferential surface of the assembly opening 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. It is arranged almost identically with.

Accordingly, the catheter protection cap is further inserted into and coupled to the outer circumferential surface of the assembly opening of the hollow housing so that the position to pull back the pull button while the protrusion plate 733a is pressed before the catheter protection cap 800 is removed. No handling is very convenient. In other words, even if an external force or an impact such as opening or removing the package is applied until the procedure, a malfunction that is pulled backward can be 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 the needle locking mechanism showing the locking and unlocking positions taken along line 3,4-3,4 of FIG.
5 is an operational flow diagram of another conventional safety catheter assembly.
6 is an exploded perspective view showing a safety catheter assembly according to a preferred embodiment of the present invention.
7 is an assembled perspective view of FIG. 6.
8 is a sectional view taken along line 8-8 of FIG.
9 is a cross-sectional view of the protective cap removed from FIG.
10 is a cross-sectional view of the needle hub of FIG. 9 in a retracted state;
11 and 12 are perspective views showing main parts of the locking mechanism.
FIG. 13 is a sectional view taken along line 13-13 of FIG. 8; FIG.
14, 15 and 16 are front perspective, front and back views 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.
20 is a side view of FIG. 18;
21 to 23 are flowcharts of the unlocking operation of the locking button and the locking link.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and like reference numerals refer to like elements, and detailed description thereof will be omitted.

6 is an exploded perspective view illustrating 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 a view of FIG. 8 is a cross-sectional view with the protective cap removed, FIG. 10 is a cross-sectional view of the needle hub of FIG. 9 being retracted, FIGS. 11 and 12 are perspective views showing main portions of the locking mechanism, and FIG. 13 is 13- 13 of FIG. 14, 15, and 16 are front perspective views, front views, and rear views of the locking link, FIG. 17 is a rear perspective view of the locking link, and FIGS. 18 and 19 are top views of the locking buttons. And a bottom perspective view, FIG. 20 is a side view of FIG. 18, and FIGS. 21 to 23 are flowcharts of the 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. A catheter 400 to be installed, a needle hollow hub 500 disposed inside the housing 300, a coil spring 600 for retracting the needle hollow hub 500 into the chamber 391, and a compressed coil spring. Release of 600 includes a locking mechanism 700 that retracts needle hollow hub 500 into housing chamber 391.

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

The 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 rectangular shape unlike the inner circumferential surface of the pipe shape, and is easy to be gripped by the operator by hand.

The cap housing 390 has a closed tubular shape having a housing chamber 391.

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

That is, as illustrated in FIG. 8, a fitting groove 313a is formed at an outer circumferential surface of the cap housing connecting pipe 313, and a fitting protrusion 390a fitted to the fitting groove 313a is formed at the tip of the cap housing 390. Formed.

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

The catheter hollow hub 430 is inserted into the outer circumferential surface of the catheter connecting tube 312 formed extending from the front side of the hollow housing 310.

The needle hollow hub 500 is composed of a needle 510 inserted into a blood vessel and the like, and a needle hollow holder 530 holding 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 circumferential surface of the end of the needle hollow holder 530.

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

That is, the locking flange 550 is preferably shaped like a rink or a running track.

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

The hollow housing 310 and the needle hollow holder 530 allow the operator (medical person) the visibility of the blood flashback to confirm the correct vascular puncture (a puncture of the human body to collect liquid or cells or tissue from the body). It is preferable to use a transparent material to increase the pressure.

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

In the compressed state (locked state) of the coil spring 600 as shown in FIG. 9, the needle hollow hub 500 is advanced, and in the released state (unlocked state) as shown in FIG. 10, the needle hollow hub 500 retreats. The needle 510 is completely removed from the catheter 400.

The locking mechanism 700 is a mechanism for retracting the needle hollow hub 500 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 rink 710 for locking the needle hollow hub 500 and a sliding link 710 as the sliding link 710 opens. The needle hollow hub 500 includes a locking button 730 that retracts.

The locking link 710 is formed in the shape of a hollow open face (hollow open face with a portion of the hollow closed cross section) installed inside the hollow housing 310.

That is, the locking link 710 has a hollow open section (field track) shape as seen in FIGS. 14 to 17, and includes left and right vertical links 711 and left and right vertical links 711 facing each other. And a lower connection link 712 for connecting the lower side of the upper and lower left and right links 713 and 714 extending inward from each of the upper sides of the left and right vertical links 711 to form an opening 715 that is cut in the center thereof. The locking locking jaw 716 is formed at the rear of the lower surface of the left and right upper links 713 and 714.

Accordingly, the outer circumferential surface of the locking flange 550 is locked to the locking locking jaw 716 in a state of being placed on the inner circumferential surface of the locking link 710 to maintain the locked state.

In this locked state, when the locking button 730 slides backward and enters the opening 715, the left and right upper links 713 and 714 also move to the left and right, so that the locking locking jaw 716 also opens to unlock. Of course, the left and right vertical links 711 are also opened together.

In particular, when viewed from the side as shown in Figure 14 the left and right vertical links 711 in front of the p-shaped fat groove 717, by thinning the front and rear length (w3) of the left and right vertical links 711 good left and right elastic gap. Let's do it.

Further, the front and rear lengths w2 of the left and right upper links 713 and 714 are made thinner than the front and rear lengths w1 of the lower connection links 712.

Accordingly, 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 lengths of the front and rear lengths of the lower link links 712 (or thicker) are inserted into the link receiving groove 330. With respect to the lower connection link 712, the elastic gap between the left and right vertical links 711 and the left and right upper links 713 and 714 is facilitated.

In addition, the link (land track) shape or the left and right vertical links 711 vertically prevents the openings from reaching the left and right side walls 333 of the link receiving groove 330 formed in the hollow housing 310 when they are opened. And compact in size. For example, in the case of a C-shaped link, it opens and then touches the left and right sidewalls first, and if it does not open further, the left and right sidewalls of the link receiving groove must be widened.

On the other hand, as shown in Figs. 17 and 16, an assembled inclined surface 710a inclined inward is formed at the rear inner edge of the locking link 710.

That is, the assembling slope 710a is very similar to the funnel shape, the diameter of which decreases from the rear to the front.

The assembly inclined surface 710a serves as a guide surface when the assembly is pushed forward as the edge of the locking flange 550 touched as shown in FIG.

That is, when the locking link 700 continues to push forward the locking flange 550 in a state in which the locking link 700 is accommodated in the link receiving groove 330 of the hollow housing 310 as shown in FIG. 21, while riding the assembly slope 710a. If the locking link 710 passes through the assembly, the assembly is completed.

The opening 715 extends from the rear end of the funnel-type introduction guide opening 715a and the funnel-type introduction guide 715a, as shown in FIGS. It consists of a straight opening 715b.

11 to 13, the locking link 710 is inserted and received from the top to the bottom in the link receiving groove 330 formed in the transverse direction of the hollow housing 310.

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 left and right side walls 333 facing the left and right vertical links 711 and the space s. )

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 bottom 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.

The upper surface of the hollow housing 310 is formed with a button mounting groove 350 in which the locking button 730 is slidably mounted.

The button mounting groove 350 includes a front button mounting groove 350a and a rear button mounting groove 350b around the link receiving groove 330.

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

The projection 734 is slidably fitted into the slot groove 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 angle locking jaw that prevents the protrusion 734 from escaping forward from the slot groove 353.

The inclined protrusion 734b serves as a guide when the locking button 730 is forcibly fitted 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 is disposed on the straight opening 715b, and the straight opening 715b. It consists of an operating 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. Preferably.

The opening insertion piece 735 is moved to the left and right while the locking button 730 is pulled backward as shown in FIGS. 21 to 23, while passing through the opening 715 of the locking link 710, and the locking flange 550 as shown in FIG. 23. Is retracted back by the elastic force as shown in Figure 10 while leaving the locking engaging jaw (716).

The pull button 731 is disposed on an upper portion of the button mounting groove 350, and an inclined surface 731a that is inclined toward one upper limit with respect to the right angle is formed on the front surface thereof to be grasped by an index finger and easily pulled back.

The slide plate 733 is formed with a protruding plate 733a which protrudes further forward than the inclined surface 731a of the pull button 731.

The protruding plate 733a is covered with the catheter protection cap 800 fitted to the outer circumferential surface of the assembly opening 360 of the hollow housing 310 as shown in FIG. 8, and at the same time as the height of the inclined surface 731a of the pull button 731. Arranged almost equally.

Therefore, before the catheter protection cap 800 is removed, there is no position to pull back the pull button 731 while the protrusion plate 733a is pressed, so that the locked state is stably maintained. That is, even if an external force or an impact such as opening or removing the package is applied until the procedure, the malfunction can be reliably prevented from being pulled back, so handling is very convenient.

As shown in FIGS. 11 and 12, an opening insertion piece allowable groove 355 communicating with the link accommodation groove 330 is formed at the bottom of the rear button mounting groove 350b.

The opening insertion piece allowable groove 355 is a non-operational opening insertion allowance 355a and an operation opening insertion allowance groove 355b that allow the non-operational opening insertion piece 735a and the operation opening insertion piece 735b to enter further. Is done.

As described above, in this embodiment, since the locking button 730 is pulled backward 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. Because the structure is pulled to the left and right, relatively less force to pull back, the operation convenience is very good.

The embodiments according to the inventive concept may be variously modified and have various forms, so the embodiments are illustrated in the drawings and described in detail herein. It is not intended to be limited to these, but includes all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

200: safety catheter assembly 300: housing
311: housing cavity 330: link receiving groove
331: mounting groove 333: left and right side walls
350: button mounting groove 351: left and right side walls
353: slot groove 360: assembly
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 rink
710a: assembly slope 711: left and right vertical link
712: lower connection link 713,714: left and right upper link
715: opening 716: locking locking jaw
717: lose weight 730: locking button
731: pull button 733: slide plate
733a: protrusion 734: protrusion
734a: jaw protrusion 734b: inclined protrusion
735: opening insert 800: catheter protection cap

Claims (5)

A housing 300 including a hollow housing 310 having a housing cavity 311 penetrating back and forth, and a cap housing 390 installed at a rear side of the hollow housing 310 and having a housing chamber 391; A catheter 400 installed at 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; 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 a locking rink 710 of an open section having an opening 715 cut in the front and rear directions, and the 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 left and right while passing through the opening 715 while sliding backward installed in the button mounting groove 350 of the) ,
The locking link 710 includes a left and right vertical link 711 facing each other, a lower connection link 712 connecting a lower side of the left and right vertical links 711, and a left and right vertical link 711 so that an opening 715 is formed at the center thereof. The left and right upper links 713 and 714 extending inwardly from each of the upper sides of the upper and lower surfaces of the left and right upper links 713 and 714 to be locked by the locking flange 550 of the needle hollow hub 500. It includes a locking locking jaw 716,
The link receiving groove 330 is a safety catheter assembly including a seating groove 331, the lower connection link 712 is seated, and the left and right side walls 333 facing the left and right vertical links 711 and the space (s).
delete The method according to claim 1,
A safety catheter assembly further comprising an assembly inclined surface 710a inclined inward at a rear inner edge of the locking link 710.
The method according to claim 3,
On the front of the left and right vertical links 711, a weight loss groove 717 is formed,
Front and rear length of the left and right vertical link 711 <front and rear length of the left and right upper links (713) 714 <front and rear length of the lower connection link (712).
The method according to claim 1, 3 or 4,
The locking button 730 includes a pull button 731, a slide plate 733 formed on the bottom 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,
On the left and right side walls 351 of the button mounting groove 350 is formed with a slot 353 for the projection 734 is fitted so as to slide back and forth,
The projection 734 is composed of a right jaw projection 734a and an inclined projection 734b of a right triangle,
The front of the slide plate 733 is formed with a protrusion plate 733a protruding further forward than the pull button 731,
Safety catheter assembly to which the catheter protection cap 800 is further fitted to the outer peripheral surface of the assembly hole 360 of the hollow housing 310 to cover the upper surface of the protrusion plate (733a).

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