# US 2016/0354545 A1 · Syringe

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- Number: US 2016/0354545 A1
- Document ID: US20160354545A1
- Status: Published application
- Kind: A1
- Application number: 15/117,648
- Filed: 2015-02-10
- Published: 2016-12-08
- Earliest claimed: 2014-02-11
- Assignees: Sulzer Mixpac AG
- Applicants: Sulzer Mixpac AG
- Inventors: Josef ETTLIN; Marco ZÜND
- Web page: https://patentgrep.com/patent/US20160354545A1

## CPC

- A61M 5/19: having more than one chamber
- A61M 5/2033: {Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287)}
- A61M 5/283: {by telescoping of ampoules or carpules with the syringe body}
- A61M 5/284: {comprising means for injection of two or more media, e.g. by mixing}
- A61M 5/288: {by piercing without internal pressure increase (A61M5/283 takes precedence)}
- A61M 5/31596: {comprising means for injection of two or more media, e.g. by mixing}
- A61M 5/3202: {Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; protectors for sharps A61B50/3001)}
- A61M 5/322: {Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston (devices for protecting guide needles in combination with catheters A61M25/0612)}
- 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 2005/1787: {Syringes for sequential delivery of fluids, e.g. first medicament and then flushing liquid}
- A61M 2005/3224: {Means to disalign the needle tip and syringe nozzle}
- 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 includes a hollow body, a piston and a seal. The hollow body has a surrounding hollow body surface and forms a passage therein. An axis is formed in an axial longitudinal direction of the hollow body and the passage has a rear body opening and a front body opening arranged opposite to one another in the longitudinal direction. A first needle seat is formed at the front body opening, in which a needle cannula is arranged and relative to which the needle cannula is movable along the axis. The piston is arranged in the hollow body and is movable in the passage along the axis. The seal is able to be cancelled such that a receiving chamber and a supply space of the syringe are in flow communication in a release position.

## Claims

### Claim 1

A syringe comprising:
a hollow body having a surrounding hollow body surface and forming a passage therein, an axis being formed in an axial longitudinal direction of the hollow body and the passage having a rear body opening and a front body opening, which are arranged opposite to one another in the axial longitudinal direction, a first needle seat being formed at the front body opening, the needle seat having a needle cannula arranged therein, the needle cannula being movable along the axis relative to the needle seat;
a piston arranged in the hollow body and being movable in the passage along the axis, the piston comprising a front piston opening, a rear piston end and a surrounding intermediate wall arranged between the front piston opening and the rear piston end and which forms a receiving chamber for receiving at least one fluid; and
an intermediate piece arranged in the receiving chamber and being movable along the axis, a first sealing region sealing the receiving chamber in a storage position acting between the intermediate wall and the intermediate piece,
a second needle seat and a supply space being formed in the intermediate piece, with the second needle seat and the supply space being in flow communication,
the piston, the hollow body and the intermediate piece being movable into a release position by a coaxial relative movement starting from the storage position, and
a seal being disposed in the storage position between the supply space and the receiving chamber, the seal being able to be cancelled by the coaxial relative movement such that the receiving chamber and the supply space are in flow communication in the release position.

### Claim 2 (depends on 1)

The syringe in accordance with claim 1, wherein the intermediate piece comprises an outer element and an inner element and the inner element is movable axially relative to the outer element to cancel the seal.

### Claim 3 (depends on 2)

The syringe in accordance with claim 2, wherein the inner element comprises an abutment for the outer element.

### Claim 4 (depends on 2)

The syringe in accordance with claim 2, wherein the seal is formed between the inner element and the outer element.

### Claim 5 (depends on 1)

The syringe in accordance with claim 1, wherein the receiving chamber is divided by a separating element into a first chamber and a second chamber, the first chamber being disposed between the second chamber and the intermediate piece.

### Claim 6 (depends on 5)

The syringe in accordance with claim 5, wherein a sealing region is formed and arranged in the storage position between the intermediate wall and the separating element such that the second chamber and the supply space do not have any flow communication.

### Claim 7 (depends on 5)

The syringe in accordance with claim 5, wherein the separating element is a film.

### Claim 8 (depends on 5)

The syringe in accordance with claim 5, wherein the intermediate piece is formed as a mandrel in the direction of the rear body opening to break open the separating element.

### Claim 9 (depends on 5)

The syringe in accordance with claim 5, wherein the separating element is a plug and is arranged movable along the axis in the receiving chamber.

### Claim 10 (depends on 1)

The syringe in accordance with claim 1, wherein the intermediate piece is configured in one part and is movable axially relative to the piston for cancelling the seal.

### Claim 11 (depends on 1)

The syringe in accordance with claim 1, wherein the inner element is a further hollow body and the piston is arranged movable in the further hollow body.

### Claim 12 (depends on 1)

The syringe in accordance with claim 1, further comprising a spring having a restoring force, and the piston is movable against the restoring force of the spring in the direction of the front body opening of the hollow body, the spring being arranged in the passage.

### Claim 13 (depends on 1)

The syringe in accordance with claim 1, wherein the receiving chamber contains at least one fluid, in a first chamber of the receiving chamber and a flushing solution in a second chamber of the receiving chamber.

### Claim 14 (depends on 1)

The syringe in accordance with claim 1, further comprising a device configured to automatically laterally pivot or deflect the intermediate piece disposed in an end position.

### Claim 15 (depends on 1)

A method comprising:
operating a syringe in accordance with claim 1 for discharging a fluid already contained in the receiving chamber without drawing in the fluid.

### Claim 16 (depends on 2)

The syringe in accordance with claim 2, wherein the inner element comprises the second needle seat.

### Claim 17 (depends on 3)

The syringe in accordance with claim 3, wherein the inner element is arranged with the abutment such that an axial movement of the inner element relative to the outer element is bounded by the abutment in the direction of the rear body end.

### Claim 18 (depends on 5)

The syringe in accordance with claim 5, wherein the second chamber and the supply space are in flow communication in a flushing position.

### Claim 19 (depends on 13)

The syringe in accordance with claim 13, wherein the at least one fluid is a liquid containing at least one medicine to be dispensed.

### Claim 20 (depends on 14)

The syringe in accordance with claim 14, wherein the device is configured to act between a rear end of the receiving chamber and the intermediate piece.

### Claim 21 (depends on 14)

The syringe in accordance with claim 14, wherein the device comprises at least one sloping surface or defines at least one inclined plane.

### Claim 22 (depends on 15)

The method in accordance with claim 15, wherein the fluid is a liquid and the liquid contains at least one medicine to be dispensed, the liquid being discharged from a first chamber of the receiving chamber in a first phase and subsequently a flushing solution is discharged from a second chamber of the receiving chamber in a second phase.