# US 11,110,219 B2 · Syringe assembly

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- Number: US 11,110,219 B2
- Document ID: US11110219B2
- Status: Granted
- Kind: B2
- Application number: 16/536,339
- Filed: 2019-08-09
- Published: 2019-11-28
- Granted: 2021-09-07
- Earliest claimed: 2016-11-29
- Assignees: Guangdong Haiou Medical Apparatus Co., Ltd.
- Applicants: Guangdong Haiou Medical Apparatus Co., Ltd.
- Inventors: Shaoji Luo; Zhuoxuan Zhang
- Web page: https://patentgrep.com/patent/US11110219B2

## CPC

- A61M 5/002: {Packages specially adapted therefor, e.g. packages for syringes or needles or kits for diabetics}
- A61M 5/178: Syringes
- A61M 5/315: Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod {or piston}; Appliances on the rod for facilitating dosing {; Dosing mechanisms}
- A61M 5/3234: {Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user}
- A61M 5/50: having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile {(retractable needles or needle protectors with means for preventing re-use A61M5/321)}
- A61M 5/3205: {Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles (for sharps A61B50/362; disintegrating apparatus in general B02C, e.g. B02C19/0075, B23H9/001; disposal of medical waste in general B09B3/00; receptacles for refuse disposal in general B65F1/00)}
- A61M 2005/3117: {Means preventing contamination of the medicament compartment of a syringe}
- A61M 2005/323: {Connection between plunger distal end and needle hub proximal end, e.g. stud protruding from the plunger}
- A61M 2005/3241: {Needle retraction energy is accumulated inside of a hollow plunger rod}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A syringe assembly includes a plunger assembly, a syringe body, and a needle. The plunger assembly includes a plunger rod, a spring, a plunger base, and a plunger plug. The plunger rod includes a first end member having a first stepped part positioned in an inner wall thereof, a second end member, and a first accommodating room. The plunger base includes a plunger body, a projection, a second stepped part, a plunger member, and a locating member. The plunger body is received in the first accommodating room, and the projection abuts against the first end member. The spring is arranged around the plunger body and positioned between the first stepped part and the second stepped part. The plunger plug is mounted to the second end member, and defines a fixing groove. The syringe body includes a needle cannula, a needle base, a fixing pole, and a fixing valve. The plunger assembly is received in the needle cannula. The needle base is mounted to the needle cannula. The fixing valve is received in the needle base. The fixing pole is received in the fixing valve and protrudes out of the needle base. The needle is received in the fixing pole. The syringe assembly of the present invention is prevented from reuse and accidently damage because the needle can retract into the plunger rod using restoring force of the spring.

## Claims

### Claim 1

A syringe assembly, comprising:
a plunger assembly comprising a plunger rod, a spring, a plunger base, and a plunger plug, the plunger rod having a first end member, a second end member, and a first accommodating room, the first end having a first stepped part positioned in an inner wall thereof, the plunger base comprising a plunger body, a locating member, a plunger member positioned at a distal end of the plunger body, a second stepped part protruding from an outer circumference of the plunger body and adjacent to the plunger member, and a projection protruding from an outer circumference of the plunger body and adjacent to the locating member; wherein the plunger body is partly received in the first accommodating room together with the projection abutting against a top portion of the first end member, and the spring is arranged around the plunger body and located between the first stepped part and the second stepped part, and wherein the plunger plug is mounted to the second end member, and defines a fixing groove;
a syringe body comprising a needle cannula defining a second accommodating room to receiving the plunger assembly, a needle base mounted to the needle cannula and defining a first receiving groove, a fixing valve partly received in the first receiving groove and defining a second receiving groove, and a fixing pole partly received in the second receiving groove and protruding out of the first receiving groove, the fixing pole comprising a first convex portion and a third receiving groove; and
a needle mounted in the third receiving groove;
wherein when the syringe assembly is in an advanced position, the spring is in a compressed state, and the first convex portion abuts against the locating member; when the syringe assembly is in a destroyed position, the spring is in a free state, the fixing pole and the needle retracts into the first accommodating room of the plunger rod, and the plunger member is received in the fixing groove.

### Claim 2 (depends on 1)

The syringe assembly of claim 1, wherein the plunger assembly comprises a hollow sealing plug, and the sealing plug is mounted to the first end member of the plunger rod and is received in the second accommodating room.

### Claim 3 (depends on 2)

The syringe assembly of claim 2, wherein the sealing plug defines a first locating groove, a second locating groove in communication with the first locating groove, and a first locating step located between the first locating groove and the second locating groove, wherein the first locating step, the first locating groove and the second locating groove are located in an inner wall of the sealing plug; the first end member includes a first locating protrusion, a second locating protrusion, and a first slot located between the first locating protrusion and the second locating protrusion; wherein the first locating step is received in the first slot, the first locating protrusion is received in the first locating groove, and a top portion of the second locating protrusion abuts against a bottom portion of the second locating groove.

### Claim 4 (depends on 3)

The syringe assembly of claim 3, wherein the sealing plug includes a third locating protrusion away from second locating groove, and a fourth locating protrusion adjacent to the first locating groove, wherein the third locating protrusion and the fourth locating protrusion are located in outer wall of the sealing plug, and wherein the third locating protrusion and the fourth locating protrusion engage with an inner wall of the second accommodating room in a sealing state to seal the needle cannula and the plunger assembly.

### Claim 5 (depends on 1)

The syringe assembly of claim 1, wherein the fixing valve includes a pair of locating arms, and each of the locating arms has a hook located in a distal end thereof, and wherein the hooks catch a distal end of the fixing pole to prevent the fixing pole from disengaging from the fixing valve.

### Claim 6 (depends on 5)

The syringe assembly of claim 5, wherein each of the locating arms is a cantilever and is resilient.

### Claim 7 (depends on 1)

The syringe assembly of claim 1, wherein the first receiving groove comprises a first channel and a second channel in communication with the first channel, wherein a diameter of the first channel is greater than a diameter of the second channel, and the fixing valve is received in the first channel.

### Claim 8 (depends on 7)

The syringe assembly of claim 7, wherein the needle base comprises a second convex portion located in an inner wall of the first receiving groove and between the first channel and the second channel, wherein the fixing pole comprises a third stepped part, and the second convex portion abuts against the third stepped part.

### Claim 9 (depends on 1)

The syringe assembly of claim 1, wherein the syringe body comprises a sealing ring mounted between the needle base and the fixing pole to seal the needle and the fixing pole.

### Claim 10 (depends on 1)

The syringe assembly of claim 1, wherein the plunger base comprises a head portion located in another distal end thereof and adjacent to the locating member.

### Claim 11 (depends on 10)

The syringe assembly of claim 10, wherein the third receiving groove comprises a third channel and a fourth channel in communication with the third channel, wherein a diameter of the third channel is greater than a diameter of the fourth channel, and wherein the head portion is received in the third channel, and the needle is fixed in the fourth channel.

### Claim 12 (depends on 11)

The syringe assembly of claim 11, wherein a connecting portion is arranged between the third channel and the fourth channel, and the connecting portion defines a through hole to facilitate a medicinal liquid to flow into the needle.

### Claim 13 (depends on 10)

The syringe assembly of claim 10, wherein the plunger member defines a first groove to facilitate the plunger member to deform inwardly, and the head portion defines a second groove to facilitate the head portion to deform inwardly.

### Claim 14 (depends on 11)

The syringe assembly of claim 11, wherein the plunger body defines a third groove adjacent to the projection to facilitate the plunge body to deform inwardly.