Syringe barrel, injection sub-assembly, and injection system for injecting fluid into a patient.

Abstract

The syringe barrel includes a body having a passage extending along a longitudinal axis between an end opening and a loading opening. The passage is configured to allow a plunger to advance along the longitudinal axis through the passage to drive liquid through the end opening. The barrel includes a base portion configured to operatively engage an injection system. The base portion has a body surface shaped to form a light propagation space adjacent to the body surface. The light propagation space extends to reflective ramps on the body surface. These reflective ramps have predetermined dimensions and positions to reflect light signals radially away from the barrel.

Description

[0001] This application is a divisional application of the invention patent application filed on May 24, 2018, with international application number PCT / US2018 / 034405, national application number 201880049344.8, entitled "Injector barrel, injection subassembly, and injection system for injecting fluid into a patient".

[0002] Related applications

[0003] This application claims priority to U.S. Provisional Patent Application No. 62 / 510,290 (Case No. 66677-P1), filed May 24, 2017, entitled “Integrated Reflection Injectionsystem,” which is incorporated herein by reference in its entirety. Technical Field

[0004] Embodiments of this disclosure generally relate to an injection system for injecting fluid into a patient during a medical procedure, and components of the injection system. Background Technology

[0005] Many different medical procedures involve the controlled delivery of specific fluids to a patient. Examples include saline, drug delivery, and contrast agents. Contrast agents are injected into the patient for diagnostic and therapeutic imaging procedures, such as computed tomography (CT). Contrast agents are typically delivered at a predetermined rate or schedule and under relatively high pressure.

[0006] Powered injection systems are frequently used during such procedures. U.S. Patent No. 6,652,489 discloses a front-loading powered injection system, a syringe, a syringe interface, a syringe connector, and a syringe plunger. These injection systems can be programmed to deliver fluid at a predetermined rate or schedule, and can provide fluid at a specified pressure.

[0007] However, such injection systems may have one or more problems. For example, at least one known injection system is automatically activated when a syringe is inserted into the port of the injection system and operatively engaged with it. The injection system uses a photodetector to confirm the presence of the syringe, and optionally other information about the syringe. Light is directed through the walls of the syringe and refracted along grooves on the outer surface of the walls. The refraction generates light signals, which are read by the photodetector. The light signals confirm the presence of the syringe within the port and can provide additional information about the syringe (e.g., the fluid contained within it). However, this known system may produce some errors or misreadings.

[0008] When the sensor is triggered by the syringe, light is directed through the wall. A flexible ring is positioned within the housing at the port interface. A portion of the syringe is inserted through the flexible ring. As the syringe is inserted to secure it to the injection reader, a radially outward-projecting flange from the syringe engages with the flexible ring, thereby moving the flexible ring. As the flexible ring moves, it triggers a Hall effect sensor within the interface. In response to this trigger, the injection system prepares for operation, and the piston engages with the plunger.

[0009] However, in this known system, the syringe needs to engage with the flexible ring each time it is loaded, causing wear and requiring frequent replacement of the flexible ring. Furthermore, the injection system automatically prepares itself upon syringe loading, which may not be desirable in certain situations.

[0010] In addition to the above, excessive pressure is applied to the fluid inside the syringe, which could lead to leakage. This would expose one side of the syringe support of the injection system to the liquid. The liquid could damage the injection reader or pose a health hazard to anyone who comes into contact with it. Summary of the Invention

[0011] According to one or more embodiments, a syringe barrel is provided. The syringe barrel includes a body having a passage extending along a longitudinal axis between an end opening and a loading opening. The passage is configured to allow a plunger to advance along the longitudinal axis through the passage to drive liquid through the end opening. The body includes a base portion configured to operatively engage an injection system. The base portion has a body surface shaped to form a light propagation space adjacent to the body surface. The light propagation space is defined by reflective bevels on the body surface. These reflective bevels have predetermined dimensions and positions to reflect light signals radially away from the barrel.

[0012] In some respects, the light propagation space may include a light propagation recess defined between the side surfaces.

[0013] In some aspects, the base portion may have a loading edge that defines the loading opening. The loading edge may have a reduced thickness along the light propagation recess. The light propagation recess may extend from the loading edge to these reflective ramps.

[0014] In some respects, the body surface can be an outer surface.

[0015] In some aspects, the base portion may include a base wall having the body surface and a loading edge defining the loading opening. The base portion may prevent a considerable amount of electromagnetic radiation having a detectable wavelength from propagating from the loading edge through the base wall to the reflecting ramps. Alternatively, the base portion may prevent a considerable amount of electromagnetic radiation having a detectable wavelength from propagating from the loading edge through the base wall to the reflecting ramps for at least one of the following reasons: (a) the base portion is constructed of an opaque material; (b) the body surface of the base portion is coated with an opaque material; or (c) the base portion includes discontinuities that scatter electromagnetic radiation.

[0016] In some respects, the light propagation space may be defined at least by the first and second platforms of the body surface.

[0017] In some aspects, the light propagation space can be a first light propagation space, and the reflecting ramps can be first reflecting ramps. The cylinder can be configured to form a second light propagation space, which can be defined between the end of the base portion and the second reflecting ramps. The second reflecting ramps can have predetermined dimensions and positions to reflect the light signal radially away from the cylinder. The first light propagation space and the second light propagation space can be located on opposite sides of the cylinder or on opposite sides of the wall of the cylinder.

[0018] In some aspects, the syringe barrel may include a main portion. The main portion and the base portion may be separate portions that can be attached to each other to form the syringe barrel. Optionally, the syringe barrel may include either the main portion or the base portion, which may have an edge channel extending circumferentially about the longitudinal axis and opening in one direction along the longitudinal axis. The edge channel may be defined between an inner wall and an outer wall. The other of the main portion or the base portion may have an edge rail extending circumferentially about the longitudinal axis. The edge rail may be configured to be received within the edge channel and threadedly engaged with the edge channel, such that the edge rail can be secured between the inner wall and the outer wall defining the edge channel.

[0019] According to one or more embodiments, an assembly is provided. The assembly includes a syringe barrel having a passage extending along a longitudinal axis between an end opening and a loading opening. The passage is configured to allow a plunger to advance along the longitudinal axis through the passage to drive liquid through the end opening. The syringe barrel includes a base portion configured to operatively engage an injection system. The base portion has a body surface configured to form a light propagation space adjacent to the base portion. A light source is configured to generate light. The light source is positioned to guide the light through the light propagation space adjacent to the body surface. The base portion includes reflective ramps. These reflective ramps have predetermined dimensions and positions to reflect light signals radially away from the syringe barrel. The light is electromagnetic radiation and may have a specified wavelength or a specified wavelength range.

[0020] In some aspects, the light propagation space may include light propagation recesses that can be defined between side surfaces that may be partially opposite each other and define the light propagation space between these side surfaces.

[0021] In some aspects, the base portion may have a loading edge that defines the loading opening. The loading edge may have a reduced thickness along the light propagation recess.

[0022] In some aspects, the light propagation space may be defined at least by a first and a second platform of the body surface. The base portion may include a base wall having the body surface and a loading edge defining the loading opening.

[0023] In some respects, the base portion may prevent a considerable amount of electromagnetic radiation with detectable wavelengths from propagating from the loading edge through the base wall to the reflecting ramps. For example, the base portion may prevent a considerable amount of electromagnetic radiation with detectable wavelengths from propagating from the loading edge through the base wall to the reflecting ramps because of at least one of the following reasons: (a) the base portion is constructed of an opaque material; (b) the body surface of the base portion is coated with an opaque material; or (c) the base portion includes discontinuities that scatter electromagnetic radiation.

[0024] In some aspects, the light propagation space can be a first light propagation space, and the reflecting ramps can be first reflecting ramps. The syringe barrel can be configured to form a second light propagation space that extends to the second reflecting ramps. These second reflecting ramps can have predetermined dimensions and positions to reflect the light signal radially away from the syringe barrel.

[0025] In some aspects, the syringe barrel may also include a main portion. The main portion and the base portion may be discrete elements that can be attached to each other to form the syringe barrel.

[0026] According to one or more embodiments, an injection system is provided. The injection system includes an injector head configured to control the delivery of a specified fluid to a patient. The injector head includes a syringe interface along an actuating side of the injector head. The syringe interface has a receiving cavity configured to receive a syringe barrel. The injector head also includes an internal sensor. A magnetic switch has an external magnet located outside the injector head. The external magnet is operable to change the magnetic field experienced by the internal sensor to activate the internal sensor.

[0027] In some aspects, the injector head also includes an internal movable magnet that can be operated to move relative to the internal sensor when the syringe barrel is inserted into the receiving cavity. The magnetic field experienced by the internal sensor can vary with the corresponding magnetic fields generated by the movable magnet and the external magnet.

[0028] In some respects, each of the magnetic switch and the movable magnet can be independently activated by the internal sensor.

[0029] In some respects, the corresponding magnetic field of the magnetic switch can reduce the influence of the corresponding magnetic field of the movable magnet on the internal sensor. Optionally, the internal sensor may be within three centimeters of the receiving cavity and within three centimeters of the outside of the injector head. The external magnet may include an electromagnet that can be configured to selectively generate the corresponding magnetic field.

[0030] In some aspects, the electromagnet may be located beside the active side of the injector head. The external magnet may include a permanent magnet. The permanent magnet may be configured to move between different positions, thereby shifting the corresponding magnetic field of the permanent magnet. The permanent magnet may be operable to move beside the active side of the injector head.

[0031] In some aspects, the injection system may include a side cover that can cover at least a portion of the operating side. Optionally, the side cover may include a track slidably coupled to the permanent magnet. The permanent magnet can slide along the track between these different positions. As the permanent magnet moves along the track, it can move relative to the internal sensor. The side cover may include at least one of a shroud or a fascia.

[0032] According to one or more embodiments, an injection subassembly is provided. The injection subassembly includes a support structure configured to be coupled to an injector head for controlling the delivery of a specified fluid to a patient. An external magnet is coupled externally to the support structure of the injector head. The external magnet is operable to alter the magnetic field experienced by an internal sensor to activate the internal sensor.

[0033] In some respects, the external magnet may include an electromagnet that can be configured to selectively generate a corresponding magnetic field.

[0034] In some aspects, the external magnet may include a permanent magnet that can be configured to move between different positions, thereby shifting the corresponding magnetic field of the permanent magnet. The permanent magnet may be operable to move sideways to the action side of the injector head.

[0035] In some aspects, the injection subassembly may also include a side cap, which may include or form the support structure. The side cap may have a syringe opening and may be configured to be mounted to the action side of the injector head.

[0036] According to one or more embodiments, a method is provided. The method includes providing an injector head configured to control the delivery of a specified fluid to a patient. The injector head includes a syringe interface along an actuating side of the injector head. The syringe interface has a receiving cavity configured to receive a syringe barrel. The injector head also includes an internal sensor. An actuating magnetic switch has an external magnet located outside the injector head. In response to actuation, the magnetic switch generates a corresponding magnetic field to alter the magnetic field experienced by the internal sensor.

[0037] In some aspects, the injector head may also include an internal movable magnet that is operable to move relative to the internal sensor when the syringe barrel is inserted into the receiving cavity. The magnetic field experienced by the internal sensor may vary with the corresponding magnetic fields generated by the movable magnet and the external magnet.

[0038] In some respects, each of the magnetic switch and the movable magnet can be independently activated by the internal sensor.

[0039] According to one or more embodiments, an injection system is provided. The injection system includes an injector head configured to control the delivery of a specified fluid to a patient. The injector head includes a syringe interface along an active side of the injector head. The syringe interface has a receiving cavity configured to receive a syringe barrel. A side cover has a syringe opening passing through it. The side cover is sized and shaped to cover at least a portion of the active side of the injector head such that the receiving cavity and the syringe opening are aligned with each other to form a port for receiving the syringe barrel.

[0040] In some respects, the injector head may be part of a legacy system that can operate without the side cap. For example, the legacy system may already be used for delivering liquids. This legacy system can operate without the side cap.

[0041] In some respects, the side cover can be detachably mounted to the injector head.

[0042] In some aspects, the side cover may have a bendable rib with a radially inward surface that can define a portion of the port. Optionally, the bendable rib may have a radially outward surface that defines a tactile opening. The bendable rib is movable when engaged with the syringe barrel, such that the size or shape of the tactile opening can change as the bendable rib moves. Optionally, the side cover may include a shield and a cover plate, which may have the tactile opening.

[0043] In some respects, the size and shape of the shield can be designed to cover the tactile opening. For example, the shield can cover at least 90% of the outer surface of the cover. Alternatively, the side cover can include a cover that covers at least a portion of the functional side and a shield that covers at least a portion of the cover.

[0044] In some aspects, the cover may include an auxiliary opening and the syringe opening. The shield may cover the auxiliary opening but not the syringe opening. The cover and the cap may be stacked side by side and may be secured to each other.

[0045] Optionally, the injection system may further include a strip. The cover plate and the cap can be secured to each other via the strip. Optionally, the side cover may cover at least 90% of the outer surface of the operating side.

[0046] In some aspects, the injection system may also include an external magnet that can be coupled to the side cover. The external magnet may be at least one of the following: (a) a permanent magnet operable to move relative to the injector head or (b) an electromagnet.

[0047] Optionally, the side cover may include a cover plate that covers at least a portion of the functional side and a shield that covers at least a portion of the cover plate. At least one of the cover plate and the shield may have a corresponding slot that can receive the external magnet. The external magnet may be movable within the corresponding slot.

[0048] According to one or more embodiments, an injection system is provided. The injection system includes a syringe barrel having a passage extending along a longitudinal axis between an end opening and a loading opening of the syringe barrel. An injector head is configured to control the delivery of a specified fluid to a patient. The injector head includes a syringe interface along an operating side of the injector head. The syringe interface has a receiving cavity configured to receive the syringe barrel. A side cap has a syringe opening passing through it. The side cap is sized and shaped to cover at least a portion of the operating side of the injector head such that the receiving cavity and the syringe opening are aligned with each other to form a port for receiving the syringe barrel. The syringe barrel is configured to rotate through an operating tum between a starting position and a loading position. The syringe barrel is releasable in the starting position. The side cap has a radially inward surface defining a portion of the syringe opening. The radially inward surface and the syringe barrel are shaped relative to each other such that the radially inward surface and the syringe barrel are slidably engaged with each other during the operating tum. The radially inward surface and the syringe barrel are shaped relative to each other such that the torque required to rotate the syringe barrel from the starting position and from the loading position is less than the torque required to rotate the syringe barrel between the starting position and the loading position.

[0049] In some aspects, the side cover may include a bendable or compressible physical feature, which may include a radially inward surface.

[0050] In some respects, the side cover can be removable.

[0051] In some respects, the side cover may include a lip that extends around most of the periphery of the side cover.

[0052] According to one or more embodiments, a method is provided. The method includes providing an injector head configured to control the delivery of a specified fluid to a patient. The injector head includes a syringe interface along an actuating side of the injector head. The syringe interface has a receiving cavity. The method involves inserting a syringe barrel into the receiving cavity of the syringe interface and operatively engaging the injector head and the syringe barrel. The method further includes operatively engaging the injector head.

[0053] In some aspects, operatively engaging the injector head and the syringe barrel involves rotating the syringe approximately one operating turn between a starting position and a loading position. The torque used to rotate the syringe barrel from the starting position and from the loading position may be less than the torque used to rotate the syringe barrel between the starting position and the loading position.

[0054] In at least one embodiment, the syringe barrel includes a body having a passage extending along a longitudinal axis between an end opening and a loading opening. The passage is configured to allow a plunger to advance through the passage to drive fluid through the end opening. The body also includes a main portion and a base portion, which are discrete elements and configured to be rotatably coupled to each other. One of the main portion or the base portion has an edge channel extending circumferentially about the longitudinal axis and opening in one direction along the longitudinal axis. The edge channel is defined between an inner wall and an outer wall. The other of the main portion or the base portion has an edge rail extending circumferentially about the longitudinal axis. The edge rail is configured to be received within the edge channel and threadedly engaged with the edge channel, such that the edge rail is secured between the inner wall and the outer wall defining the edge channel.

[0055] In some aspects, the edge track has an inward-facing surface, and the inner wall has an outward-facing surface. The inward-facing and outward-facing surfaces taper in a direction toward the longitudinal axis. Optionally, an inner ring structure is attached to the inner wall. Optionally, the inner ring structure protrudes from the top of the inner wall.

[0056] In some respects, the inner ring structure is connected to the inner wall and extends circumferentially around the longitudinal axis and protrudes radially inward from the inner wall.

[0057] In some respects, the main portion and the base portion have corresponding protrusions that engage with each other when the main portion and the base portion are in a fully engaged state. These protrusions provide a clear stop that indicates that the main portion and the base portion are in a fully engaged state.

[0058] In some aspects, the base portion has a body surface shaped to form a light propagation space beside the body surface. This light propagation space is defined between an end of the base portion and reflective ramps on the body surface. These reflective ramps have predetermined dimensions and positions to reflect light signals radially away from the cylinder.

[0059] According to one or more embodiments, an injection subassembly is provided, including a side cap having a syringe opening. The side cap is configured to be mounted on the actuating side of an injector head for controlling the delivery of a specified fluid to a patient. The injection subassembly also includes an external magnet externally coupled to the side cap. The external magnet is operable to alter the magnetic field experienced by an internal sensor within the injector head to activate the internal sensor. Attached Figure Description

[0060] Figure 1This is a side view of an injection system formed according to an embodiment, the injection system including a known injector head and a cover plate.

[0061] Figure 2 yes Figure 1 A top perspective view of an injection system having a syringe barrel received in one port of the injection system.

[0062] Figure 3 This is a side view of a known injector sub-component, including the syringe interface and the syringe.

[0063] Figure 4 yes Figure 3 A perspective view of a syringe with a known injector subassembly, which is prepared to be placed within a syringe interface.

[0064] Figure 5 yes Figure 3 A rear-view perspective view of the syringe interface, in which the flexible ring is disconnected from the connector housing of the syringe interface.

[0065] Figure 6 yes Figure 3 A rear-view perspective view of the syringe interface, in which a flexible ring is installed inside the connector housing.

[0066] Figure 7 This is a perspective view of a syringe barrel formed according to one embodiment, which can be used with... Figure 1 It is used in conjunction with known injection systems and includes a body and a syringe base.

[0067] Figure 8 yes Figure 7 An enlarged side-view stereoscopic view of a portion of the syringe barrel before assembly.

[0068] Figure 9 This is a side view of the syringe barrel after assembly and in a fully engaged state.

[0069] Figure 10 This is a cross-sectional side view of the syringe barrel after assembly and in a fully engaged state, showing the locking feature of the syringe barrel.

[0070] Figure 11 This is a side perspective view of a portion of a syringe barrel formed according to one embodiment.

[0071] Figure 12 yes Figure 11 A cross-sectional side view of the syringe barrel before assembly, which shows some features in more detail.

[0072] Figure 13 yes Figure 11A cross-sectional side view of the syringe barrel after assembly and in a fully engaged state.

[0073] Figure 14 It is a cross-sectional view of a portion of a known syringe, showing the refraction of light from the syringe.

[0074] Figure 15A This is a cross-sectional view of a portion of a syringe barrel formed according to one embodiment, showing light reflecting off the outer surface of the syringe barrel.

[0075] Figure 15B This is a cross-sectional view of a portion of a syringe barrel formed according to one embodiment, showing the reflection of light from the interior of the syringe barrel.

[0076] Figure 16 This is an end view of a portion of an injection system according to one embodiment, with the syringe barrel in the releasable position.

[0077] Figure 17 When the syringe barrel is in the loading position Figure 16 An end view of part of the injection system.

[0078] Figure 18 This is a schematic diagram of a mechanism that provides tactile feedback to users.

[0079] Figure 19 This is an exploded view of the injection sub-component formed according to one embodiment.

[0080] Figure 20 yes Figure 19 The front-view stereoscopic view of the injected sub-component.

[0081] Figure 21 yes Figure 19 The rear-view stereoscopic view of the injected sub-component.

[0082] Figure 22 yes Figure 19 A magnified view of the bottom side of the injected child component.

[0083] Figure 23 It is a schematic diagram of a magnetic switch and shows the magnetic effects of the internal magnet and the external permanent magnet on the internal sensor of the injector head.

[0084] Figure 24 It is a schematic diagram of a magnetic switch and shows the magnetic effects of the internal magnet and external electromagnet on the internal sensor of the injector head.

[0085] Before detailing the embodiments of this disclosure, it should be understood that the application of this disclosure is not limited to the details of the construction and arrangement of the components set forth in the following description or shown in the accompanying drawings. This disclosure can have other embodiments and can be practiced or implemented in many different ways. Moreover, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of "comprising" and "including," and variations thereof, is intended to cover all items listed thereafter and their equivalents, as well as additional items and their equivalents. Detailed Implementation

[0086] The embodiments described herein may include injection systems, caps for such systems, system cartridges, and methods of manufacturing and using them. These embodiments can be used when a specified fluid, such as a contrast agent or saline, is injected into a patient before and / or during a medical procedure (e.g., a CT scan). These embodiments may include a syringe cartridge (e.g., a 200 ml syringe cartridge) having a base portion and a main portion, which are manufactured separately and then assembled together. In some embodiments, the base portion includes surfaces having a refractive index configured to reflect light signals propagating from a light source. The base portion may include an opaque material. Unlike existing known systems that rely on refraction, the syringe cartridge is configured to activate a photosensor circuit in the injector head through reflection.

[0087] The cover can be a multi-purpose cover. In the illustrated embodiment, the cover is configured to (a) protect the injector head from leaking fluid; (b) support a mechanism (e.g., a switch) for activating or actuating the injector head; and (c) provide the user with a tactile indication that the syringe barrel has been moved to the loading position or to the start / release position. In other embodiments, the cover can be configured for any one of (a), (b), or (c), or any two of (a), (b), or (c).

[0088] Compared to known systems in the prior art, the embodiments can reduce component wear and are less prone to spills and / or leaks. For example, the cover and syringe barrel described herein can reduce the frequency of flexure ring replacement and / or reduce the likelihood of liquid leaking from the syringe barrel and spilling onto the injector head. The syringe barrel can also enhance the user experience by being more consistently identified / read. The cover can enhance the user experience by providing tactile indication that the syringe barrel has been loaded onto the injector head or that the syringe barrel can be released from the injector head.

[0089] Figure 1 This is a side view of an injection system 100, which includes an injector head 102 and a cover plate 104, which in some embodiments may also be referred to as a side cover. Figure 2 This is an enlarged view of an injection system 100 having a cover 104 coupled to an injector head 102. The injection system 100 is a flow control system that regulates the operation of a piston (not shown) to control the flow rate of fluid delivered by the injection system 100. The injection system 100 is configured to support one or more syringe barrels 125 and to inject a specified fluid into a patient (e.g., a human or animal) through the syringe barrels 125. For example, the injector head 102 may include linear reciprocating plungers, each linear reciprocating plunger coupled to a plunger 128 disposed within the syringe barrel 125. Figure 2 ) join.

[0090] In some embodiments, the injector head 102 may be a known injector head. In a particular embodiment, the injection system 100 is configured to inject intravenous contrast agent and saline into a patient for diagnostic studies in computed tomography (CT) applications. However, it should be understood that the injection system 100 can be used in other medical procedures.

[0091] In some embodiments, the cover plate 104 may be removably coupled to the injector head 102, such that the cover plate 104 can be attached to and unattached to the injector head 102 without damaging the injector head 102 or the cover plate 104. The cover plate 104 may cover the active side 110 of the injector head 102. Figure 1 At least a portion of the injector head 102. In the illustrated embodiment, the cover 104 is sized and shaped to cover the entire operating side 110 and includes a peripheral lip 124 extending around at least a majority of the periphery of the cover 104. The peripheral lip 124 is designed to reduce the likelihood that leaked liquid will directly contact the injector head 102. Alternatively, the cover 104 may be configured to cover more than one side of the injector head 102 or less than the entire operating side 110.

[0092] The injector head 102 includes a user interface 106 with an array of user-activated control elements 108, which may include physical elements (e.g., switches, buttons, knobs) and / or virtual elements (e.g., buttons appearing on a touchscreen). The user-activated control elements 108 allow the user to selectively control, for example, the flow rate of fluid, selectively control the temperature of the delivered fluid, or purge air from the injection system or syringe barrel. Although not shown, the injection system 100 may be part of a larger system including a computing system, a display, and a base or support for holding the injection system 100.

[0093] The action side 110 is configured to receive the cover plate 104. In the illustrated embodiment, the injection system 100 includes ports 112, 114. Each port 112, 114 is configured to receive one of the syringe barrels 125. The syringe barrel 125 is configured to be front-loaded such that the base portion of the syringe barrel 125 is inserted through the respective port. Each port 112, 114 includes an opening 116 through the cover plate 104 and a receiving cavity 117 for the injector head 102.

[0094] As described herein, cover plate 104 may include a magnetic switch 120 positioned adjacent to sensor 122 (e.g., a Hall effect sensor) of injector head 102, such that magnetic switch 120 can activate sensor 122. Magnetic switch 120 may include permanent magnet 121. In other embodiments, magnetic switch 120 may include an electromagnet. In the illustrated embodiment, the magnetic switch and permanent magnet 121 are positioned externally to injector head 102. For example, permanent magnet 121 may be adjacent to injector head 102 such that permanent magnet 121 engages with injector head or has only a nominal gap (e.g., less than 5 mm) between them.

[0095] The permanent magnet 121 is operable to alter the magnetic field experienced by the internal sensor, thereby activating the internal sensor. In the illustrated embodiment, the permanent magnet 121 is cylindrical or barbell-shaped and forms a snap-fit ​​engagement with the cover plate 104. The sensor 122 is... Figure 1 The sensor 122 is triggered in response to the activation of the magnetic switch 120 (e.g., by movement by a user). More specifically, the permanent magnet 121 and its corresponding magnetic field can be moved relative to the sensor 122. The injector head 102 can perform one or more operations in response to the triggering of the sensor 122. For example, the injector head 102 can identify / read the syringe barrel 125 and / or move the piston (not shown) to prepare for the injection of a specified fluid into a patient. In response to the triggering of the sensor 122, the injector head 102 can cause the piston to automatically retract or automatically advance in the passage of the syringe barrel.

[0096] Figures 3 to 6A known injector subassembly 200 is shown, comprising a known syringe interface 202 and a known syringe 204. As described herein, syringe 204 may be replaced by syringe barrel 125. Syringe interface 202 can be considered as part of injector head 102 and is configured to engage syringe 204 to injector head 102. Syringe interface 202 provides a mechanism by which the syringe (or syringe barrel) can be quickly positioned relative to injector head 102. The rear surface 206 of syringe interface 202 is attached to the front surface 208 of injector head 102. The front surface 220 of syringe interface 202 is adapted to receive the rear end 222 of syringe 204.

[0097] The syringe interface 202 includes a connector housing 224 and a flexible ring 226 disposed within the connector housing 224 near the front surface 220. The syringe 204 includes a cylindrical body 230 having a tapered portion 232 at its front end 234. The tapered portion 232 is integrally connected to an outlet end 236. The outlet end 236 is provided with a Luer lock 238, which can be connected to a tube (also not shown) ultimately connected to a patient (not shown).

[0098] A ridge 244 is integrally formed on the syringe 204 toward the rear end 222 of the syringe 204. In the illustrated embodiment, the ridge 244 is continuously formed around the periphery of the syringe 204. The ridge 244 includes two parts: a sloping section 246 and a shoulder section 248, which is substantially perpendicular to the outer surface of the cylindrical body 230. Two or more extending protrusions 250 are disposed in front of the shoulder 248, between the shoulder 248 and the flange 242. The protrusions 250 are configured to engage the flexible ring 226 to release the connection between the syringe 204 and the syringe interface 202. As described herein, the syringe barrel 125 ( Figure 2 Other syringe barrels do not include a protrusion that engages the flexible ring, and are not designed to engage the flexible ring.

[0099] The front plate 254 has a hole 258 through which it passes. A lip 260 extends around the periphery of the hole 258. When the syringe 204 engages the syringe port 202, the flange 242 and the lip 260 engage with each other to minimize the possibility of any leaked contrast agent entering the interior of the syringe port 202 through the hole 258. Alternatively, the syringe 204 may be configured not to include the flange 242. However, when the flange 242 engages with the front surface 220 of the front plate 254, the flange also functions as an additional mechanical stop structure to ensure proper axial positioning of the syringe 204 relative to the injector head 102.

[0100] The flexible ring 226 may be made of an acetal copolymer or any other suitable material. The flexible ring 226 may include a straight or flat portion 262 on either side, which is integrally connected to two curved portions 264. As shown, the flexible ring 226 includes a 258 passing through it. On the front side of the flexible ring 226, one or more beveled surfaces 282 may be provided to facilitate insertion of the rear end 222 and ridge 244 of the syringe 204 through the one or more beveled surfaces.

[0101] The rear surface 296 of the front plate 254 includes recesses or recesses 298 having a shape similar to that of the flexible ring 226. Two notches 299 are formed in the rear surface 296 of the front plate 254. The notches 299 receive extensions 268 of the flexible ring 226. The recesses 298 are shaped to be larger than the flexible ring 226, and when the flexible ring 226 is in a relaxed state, the distance between the notches 299 is greater than the distance between the extensions 268. The notches 299 help prevent the flexible ring 226 from rotating within the housing 224 while allowing the flexible ring 226 to expand to its extended state.

[0102] To connect syringe 204 to syringe interface 202, the rear end 222 of syringe 204 passes through hole 258 in front plate 254 to insert into connector housing 224. Flexible ring 226 is held or fixed in recess 298 formed in rear surface 296 of front plate 254, such that extension 268 is disposed in recess 299. When the inclined surface 246 of ridge 244 of syringe 204 engages the chamfered portion 282 on flexible ring 226, ridge 244 forces flexible ring 226 from its relaxed state into its extended (or tensioned) state.

[0103] After the ridge 244 passes over the rear edge of the flexible ring 226 and the radially outwardly extending protrusion 250 rotates and disengages from the flexible ring 226, the elastic nature of the flexible ring 226 causes it to return to its relaxed state. When the flexible ring 226 can return to its relaxed state, the shoulder 248 of the ridge 244 engages the rear edge of the flexible ring 226. Thus, the syringe 204 is held in place by the flexible ring 226 and cannot be axially removed from the syringe port 202. When the flexible ring 226 returns to its relaxed state, an audible signal and / or other signals, as described above, can be provided to indicate to the operator that the syringe 204 has been mounted on the injector. The audible signal and / or other signals can be generated, for example, mechanically or electronically.

[0104] The flexible ring 226 has a magnet 227 or other element attached to at least one generally flat portion 262 (generally corresponding to the long axis or main axis of the flexible ring 226). This magnet or other element cooperates with a proximity sensor 259 (e.g., a Hall effect sensor) to determine, for example, whether the flexible ring 226 has returned to its relaxed state after the insertion of the syringe 204. In this respect, when the flexible ring 226 is in its relaxed state, the magnet 227 is adjacent to the proximity sensor 259, such that the proximity sensor 259 detects a portion of the magnetic field of the magnet 227 (e.g., a magnetic pole of the magnetic field). Based on the position of the magnetic field relative to the proximity sensor 259, or more specifically, based on the strength of the magnetic field experienced by the proximity sensor 259, the circuit can be in one of two different states. A first state may be associated with the presence of the syringe, while a second state may be associated with the absence of the syringe.

[0105] When the flexible ring 226 is in its extended state, the magnet 227 is moved away from the proximity sensor 259. For example, the magnet 227 can be pulled to approximately 0.050” to 0.250” away from the proximity sensor 259, thereby reducing the strength of the magnetic field. This can cause the sensor's circuitry to indicate the presence of the syringe. For example, the output voltage can increase when the syringe is present.

[0106] The proximity sensor 259 is operatively connected to the injector head 102 to prevent operation of the injector head 102 if the flexible ring is in its extended state (indicating that the syringe 204 is not properly or fully connected to the interface or syringe interface 202). The proximity sensor 259 can also trigger audible and / or other indications that the syringe 204 is properly connected to the syringe interface 202 or that the syringe 204 has been disengaged from the syringe interface 202.

[0107] After the syringe 204 has been properly connected to the syringe port 202, removing the syringe from the syringe port 202 requires rotating the syringe 204 approximately 1 / 4 turn or approximately 90°. Generally, the protrusion 250 extends radially outward at least to the same extent as the ridge or flange 244. When the syringe 204 is rotated about its axis to the locked position, the protrusion 250 abuts against the flexible ring 226 and forces the flexible ring 226 into its extended position. In this position, the syringe 204 can be moved axially forward relative to the syringe port 202, such that the ridge 244 advances in front of the flexible ring 226, and the syringe 204 is released from its connection with the syringe port 202.

[0108] Once the syringe 204 is fully positioned rearward within the syringe port 202, the operator must ensure that the syringe 204 is rotated about its axis so that the protrusion 250 moves and disengages from the flexible ring 226, and the flexible ring 226 is allowed to return to its relaxed state.

[0109] In some embodiments, when the syringe is inserted, it operatively engages a toothed circular nylon ring for rotation. As the ring rotates in one direction, a track on the ring causes the elongated, flexible ring to expand and the permanent magnet to move further away from the Hall effect sensor. By rotating the ring to specific positions, the distance between the magnet and the Hall effect sensor can be repeatedly selected, thereby repeatedly altering the effect of the magnetic field on the sensor.

[0110] As described below, embodiments may optionally avoid fully engaging the flexible ring, thus preventing activation of the Hall effect sensor. However, embodiments may use auxiliary mechanisms (e.g., magnetic switches) for activating the sensor.

[0111] Figure 7 This is a perspective view of a syringe barrel 300 formed according to an embodiment. Syringe barrel 125 ( Figure 2 The syringe barrel 300 may be similar to or the same as the syringe barrel 300. The syringe barrel 300 is configured to be operatively coupled to an injection system such as injection system 100. The syringe barrel 300 may be a multi-piece component. For example, the syringe barrel 300 includes a main portion 304 and a base portion 306 attached to each other to form a barrel 302 that defines a passage 308. Optionally, the syringe barrel 300 may also include a plunger 310 disposed within the passage 308.

[0112] The cylinder 302 extends between the end opening 312 and the loading opening 314. The passage 308 extends along the longitudinal axis 316 between the end opening 312 and the loading opening 314. The passage 308 is configured to allow the plunger 310 to advance through the passage in order to drive liquid through the end opening 312.

[0113] The base portion 306 and the main portion 304 are rotatably connected to each other at a joint 318. For example, the base portion 306 and the main portion 304 may form an interference fit and / or threaded engagement at the joint 318. In some embodiments, the plunger 310 overlaps with the joint 318 at a starting position (e.g., before injection). The base portion has a loading edge 320 defining a loading opening 314. As described herein, the base portion 306 includes an identification region 322 along a body surface 324 of the base portion 306. As shown, the body surface 324 is an outer surface radially opposite to the longitudinal axis 316. The identification region 322 is configured to identify the presence of the syringe barrel, and optionally information about the syringe barrel.

[0114] The base portion 306 also has a body surface 325 as an inner surface. Figure 8As an alternative to or supplement to the body surface 324 having the marking area 322, the body surface 325 may have the marking area. Thus, these marking areas may be located along the inner surface of the cylinder, the outer surface of the cylinder, or both the inner and outer surfaces.

[0115] The main portion 304 has an outer surface 330. In the illustrated embodiment, the body surface 324 and the outer surface 330 are combined to form the outer surface 331 of the cylinder 302. The main portion 304 may be at least partially translucent, allowing a user to determine the liquid level within the passage 308 or the axial position of the plunger 310 within the passage 308. The base portion 306 may comprise a different material, such as an opaque material with lower light transmittance than the material forming the main portion 304. Optionally, the main portion 304 may include a leading flange 332 projecting radially away from the body surface 324. The leading flange 332 extends entirely around the longitudinal axis 316. Optionally, the leading flange 332 may extend only partially around the longitudinal axis 316. The leading flange 332 may have multiple distinct segments, each projecting radially away from the outer surface 330 at a common axial position but at different radial positions.

[0116] The main portion 304 may further include retaining shoulders 336, 338. In the illustrated embodiment, the retaining shoulders 336, 338 project from the outer surface 330 in opposite directions away from each other and the longitudinal axis 316. The retaining shoulders 336, 338 are spaced apart from the leading flange 332 by a certain axial distance 341. Figure 7 In this embodiment, the main portion 304 includes a pair of retaining shoulders. In other embodiments, the main portion 304 may have more than two retaining shoulders or only one retaining shoulder. As described herein, the retaining shoulders may engage the cover plate 104 ( Figure 1 To provide tactile feedback to the user.

[0117] Figure 8 This is an enlarged cross-sectional view of the main portion 304 and the base portion 306 before they are threaded together. The main portion 304 and the base portion 306 are discrete elements rotatably connected to each other. In other words, the main portion 304 and the base portion 306 are individual elements that are combined together to form an integral structure, namely the cylinder 302. Joint 318 ( Figure 7 It can effectively prevent fluid leakage during operation.

[0118] As shown, the base portion 306 includes an edge channel 340 that extends circumferentially about a longitudinal axis 316 and opens in a direction 398 along the longitudinal axis 316. The edge channel 340 is defined between an inner wall 342 and an outer wall 344. The main portion 304 has an edge track 36 that extends circumferentially about a longitudinal axis 316. The edge track 346 extends longitudinally along the longitudinal axis 316 in a direction 398 opposite to the direction 399. The edge track 346 is sized and shaped such that when the main portion 304 and the base portion 306 are rotatably coupled, the edge track 346 is received within the edge channel 340. When engaged, the edge track 346 is held between the inner wall 342 and the outer wall 344 defining the edge channel 340.

[0119] Edge track 346 includes an edge 348, a shoulder surface 350, and a slide 352 defined between the shoulder surface 350 and the edge 348. The slide 352 is configured to receive a thread 354 of the base portion 306. Edge track 34 is also shown to have an inward-facing surface 356, and an inner wall 342 has an outward-facing surface 358. The inward-facing surface 356 and the outward-facing surface 358 taper in a similar manner relative to the longitudinal axis 316. More specifically, as the inward-facing surface 356 and the outward-facing surface 358 extend along direction 398 from the loading opening 314 to the end opening 312, the inward-facing surface 356 and the outward-facing surface 358 partially extend toward the end opening 312. Due to the taper of the inward-facing surface 356 and the outward-facing surface 358, the base portion 306 is more easily received by the main portion 304 during engagement. More specifically, the tapered inward-facing surface 356 and the outward-facing surface 358 allow for greater misalignment during engagement.

[0120] It is also shown that the base portion 306 includes an inner ring structure 360, which is coupled to the inner wall 342 and extends circumferentially around the longitudinal axis 316. The inner ring structure 360 ​​projects radially inward from the inner wall 342 toward the longitudinal axis 316. The inner ring structure 360 ​​projects radially inward from the top (or distal end) of the inner wall 342. The inner ring structure 360 ​​can enhance the structural integrity of the inner wall 342, thereby making the inner wall 342 more resistant to pressure changes within the passage 308. The tapered inward-facing surface 356 and the outward-facing surface 358 can also make the cylinder 302 more resistant to pressure changes, making it less likely for liquid to leak through the joint 318.

[0121] Although the above description refers to a base portion 306 having an edge channel 340 and a main portion 304 having an edge track 346, it should be understood that in other embodiments, the base portion may include an edge track and the main portion may include an edge channel.

[0122] The identifying region 322 of the base portion 306 includes a light propagation space 362. In the illustrated embodiment, the light propagation space 362 is a void or recess formed by the body surface 324 of the base portion 306. The dashed line 370 represents an envelope that conforms to the shape of the base portion 306. The dashed line 370 indicates where the material of the base portion 306 would be for the light propagation space 362.

[0123] In some embodiments, the light propagation space 362 is positioned along an arcuate segment of the base portion 306. In such embodiments, the light propagation space does not extend entirely around the base portion 306. The arcuate segment may, for example, correspond to less than one-third of the body surface 324 within a cross-section of the base portion 306 perpendicular to the longitudinal axis. In the illustrated embodiment, the arcuate segment corresponds to less than one-quarter or less than one-fifth of the body surface 324 within a cross-section of the base portion 306.

[0124] The light propagation space 362 begins at the loading edge 320 and extends to reflective ramps 364 and 366 on the body surface 324. The reflective ramps 364 and 366 project at a non-orthogonal angle away from the longitudinal axis 316 and define the ends of the light propagation space 362. This angle can be approximately 45°, however other angles may be used. The reflective ramps 364 and 366 have predetermined dimensions and positions relative to each other to reflect a predetermined set of light signals radially away from the barrel 302. The predetermined set of light signals can constitute a code for confirming the presence of the syringe barrel 300 within a receiving cavity (not shown) in the injector head (not shown). This code can also provide information related to the syringe barrel 300 or its contents, such as the liquid within the syringe barrel, the liquid volume, the liquid supplier, or the date the liquid was supplied to the syringe barrel.

[0125] It is also shown that the base portion 306 includes a notch 345 opening at the loading edge 320. The notch 345 can provide a reference feature through which the syringe barrel 300 is oriented. More specifically, the notch 345 can engage a corresponding feature of the injector head such that the syringe barrel 300 is correctly oriented relative to the injector head.

[0126] Figure 9This is a side view of a portion of the syringe barrel 300 after the main portion 304 and the base portion 306 have been threaded together and are in the fully engaged position. In some embodiments, at least one of the main portion 304 or the base portion 306 includes a protrusion configured to be received within a recess in the other portion. For example, in the illustrated embodiment, the main portion 304 includes a protrusion 372 (e.g., a tooth) projecting in a direction 399 away from the shoulder surface 350. The base portion 306 includes a recess 374 sized and shaped to receive the protrusion 372. The protrusion 372 and the recess 374 are positioned such that when the protrusion 372 is received within the recess 374, the syringe barrel 300 reaches the fully engaged position. When the main portion 304 and the base portion 306 are threaded together, the protrusion 372 can engage the top surface 351 of the outer wall 344 as it approaches the recess 374. When the protrusion 372 engages the top surface 351 of the outer wall 344, the resulting friction can be felt by a user who is threadedly engaging the main portion 304 and the base portion 306. As the protrusion 372 enters the recess 374, the friction may decrease immediately after a significant increase. Furthermore, the protrusion 372 and the recess 374 can be shaped to prevent further rotation.

[0127] It is also shown that the main portion 304 includes a shoulder 335 projecting radially away from the outer surface 330. The shoulder 335 is configured to be positioned behind the flexible ring of the injector head. The shoulder 335 prevents accidental removal of the syringe barrel 300 from the receiving cavity during operation. As shown, the shoulder 335 extends only partially around the circumference of the outer surface 330. Although only one shoulder 335 is shown, embodiments may include more than one shoulder 335. For example, embodiments may include two shoulders 335 positioned 180° apart from each other.

[0128] In such Figure 9 In the fully engaged position shown, one or more physical features of the main portion 304 have a predetermined position relative to one or more physical features of the base portion 306, and vice versa. For example, when the syringe barrel 300 is operatively engaged to the injector head, the shoulder 335 may have a predetermined position. As another example, when the syringe barrel 300 is operatively engaged to the injector head, the marking area 322 of the body surface 324 may have a predetermined position. In this predetermined position, the light source can illuminate the reflecting ramps 364, 366 at a section of the light propagation space 362. Because the reflecting ramps 364, 366 are in the predetermined position, the light signal reflected by the reflecting ramps 364, 366 is directed toward the photodetector located at a predetermined fixed position.

[0129] In some embodiments, the syringe barrel 300 may include at least two marking regions 322 or two light propagation spaces 362, 363 along the body surface 324. Figure 8 (As shown). Light propagation spaces 362, 363 can be on opposite sides of the barrel. For example, the two light propagation spaces 362, 363 can be 180° apart. In some embodiments, when the syringe barrel 300 is inserted into the receiving cavity, the shoulder 335, the light propagation spaces 362, 363, and the retaining shoulders 336, 338 allow the syringe barrel to be oriented only in two possible rotational orientations. As described below, the cover can be shaped to receive the syringe barrel only in the two possible orientations that are 180° apart.

[0130] In the illustrated embodiment, the light propagation space 362 is formed by a body surface 324, which is an outer surface radially opposite to the longitudinal axis 316. As an alternative or supplement to the body surface 324, a body surface 325 may be formed to define a light propagation space (not shown), which may resemble one or more light propagation spaces described herein. For example, the body surface 325 may include angled surfaces that reflect and / or refract light signals away from the barrel. For example, in such an embodiment, the base portion may have an opening therethrough that allows reflected light signals to propagate from the interior of the base portion to the exterior of the base portion. Alternatively, the light signal may be incident on an inner surface and refracted through the base portion to reach the exterior of the base portion. Thus, the syringe barrel 300 may have one or more surfaces along the exterior of the barrel 302, one or more surfaces along the interior of the barrel 302, or multiple surfaces along both the exterior and interior, configured to reflect and / or refract light signals away from the barrel 302. In such an embodiment, the optical signal can propagate along the cylinder 302 in free space until it is incident on the surface of the cylinder 302.

[0131] Figure 10 This is a cross-sectional view of a portion of the syringe barrel 300 when the main portion 304 and the base portion 306 are in a fully engaged state. As shown, the joint 318 is defined by the shoulder surface 350 and the top surface 351 of the outer wall 344. The inward-facing surface 356 and the outward-facing surface 358 engage with each other along an angled interface 376. Optionally, the inner ring structure 360 ​​can provide a placement area 375 for the plunger 310. The inner ring structure 360 ​​also increases the stiffness of the inner wall 342, making the inner wall 342 elastic to bend when a sharp pressure change occurs within the passage 308. Due to the angled interface 376, the joint 318, and the inner ring structure 360, the multi-piece syringe barrel 300 is leak-resistant.

[0132] Figure 11This is a bottom-view perspective view of a portion of syringe barrel 400. Syringe barrel 400 may be similar to syringe barrel 300. Figure 7 It includes a main portion 404 and a base portion 406. As shown, the main portion 404 and the base portion 406 are joined to each other along a seam 418. The main portion 404 includes fingers 444, and the base portion 406 includes slots 445.

[0133] Figure 11 The diagram also shows that a light propagation space 461 is defined between opposing side surfaces 472 and 474. In such embodiments (where the light propagation space is a void in the body surface of the syringe barrel), the light propagation space may be referred to as a light propagation recess. Similar to light propagation space 362, light propagation space 461 extends from loading edge 420 to reflecting ramps 465 and 466.

[0134] Figure 12 and Figure 13 These are cross-sectional views of the syringe barrel 400 before and after the main portion 404 and the base portion 406 are joined. In the illustrated embodiment, the main portion 404 and the base portion 406 can be snap-fit, allowing the two portions to be aligned along a longitudinal axis (not shown) and pressed together under axial force. The inner wall 462 of the main portion 404 and the outer wall 462 of the base portion 404 each have a ridge 484 and a channel 486 defined by the ridge 484. When an axial force is applied, the inner wall 462 and the outer wall 464 can be bent, allowing the ridges of the inner wall 462 and the outer wall 464 to pass over each other and snap into the corresponding channels. In the illustrated embodiment, the main portion 404 and the base portion 406 snap-fit ​​only when the finger portion 444 is aligned with the slot 445.

[0135] In other embodiments, the main portion 404 and the base portion 406 may be rotatably connected. The finger portion 444 may be a flexible finger portion capable of bending radially inward toward the longitudinal axis. When the main portion 404 and the base portion 406 are rotatably connected, the finger portion 444 may bend inward. As the finger portion crosses the slot 445, it may flex into the slot 445, thereby preventing further rotation of the main portion 404 and the base portion 406.

[0136] Figure 14This is a schematic diagram of the identification area 500 used in a known system. In a known system, a light source generates light 501, which propagates through the wall 504 of the syringe 502. For example, a laser or LED light source can provide light 501 that propagates through the edge surface 505 of the wall 504. The light 501 can propagate through the wall 504 and interact with discontinuities in the material of the wall 504, causing refraction, in which the light leaves the syringe 502 in a predetermined manner and is guided away from the syringe 502. More specifically, the wall 504 may include an open side groove or channel 508 with a surface at a predetermined angle, such that light can interact with the wall 504 and generate an optical signal 510 that propagates away from the syringe 502.

[0137] Figure 15A A syringe verification component 520 that can be used by one or more embodiments described herein is shown. For example, the syringe verification component 520 may include an identification region 522 of a syringe barrel 516, a light source 524, a photosensor 526, and a controller 525. The identification region 522 is a shaped portion of the syringe barrel 516 having a base wall 518 of a base portion 542. In some embodiments, the syringe verification component 520 includes a syringe barrel 516 and a light source 524 and / or a photosensor 526. The base wall 518 has an outer body surface 527 shaped to provide a light propagation space 528. The light propagation space 528 may be associated with light propagation spaces 362 (FIG. 8) and 462 (FIG. 9). Figure 11 Similar or identical.

[0138] The light propagation space 528 terminates at reflecting ramps 530 and 532. As shown, the light source 524 generates light 534, which propagates within the light propagation space 528 beside the base wall 518. The light 534 is reflected by the reflecting ramps 530 and 532 in a predetermined manner. More specifically, the dimensions, shape, and position of the reflecting ramps 530 and 532 are designed such that they guide the light signal 540 radially away from the base wall 518 and toward a predetermined position.

[0139] The light propagation space 528 may have at least a first platform 580 and a second platform 582 on the outer body surface 527. The first platform 580 is closer to the longitudinal axis 590 than the second platform 582. In other words, the second platform 582 has a greater height along the outer body surface 527. As shown in FIG. 15, the length of the first platform 580 along the longitudinal axis 590 is greater than the length of the second platform 582. It is also shown that the base portion 542 has a loading edge 544 defining a loading opening. The loading edge 544 has a reduced thickness.

[0140] Light source 524 can be configured to generate electromagnetic radiation with a specified wavelength or a specified wavelength range. For example, the electromagnetic radiation can be light radiation within the visible spectrum (e.g., 390 nanometers (nm) to 700 nm). Electromagnetic radiation can also be light radiation within the typically invisible spectrum, such as ultraviolet (10 nm to 400 nm) and infrared (700 nm to 1550 nm or greater). It should be understood that various light sources, detectors, and materials exist, and light sources, detectors, and materials can be configured to reflect and detect optical signals.

[0141] A photodetector 526 is positioned at a predetermined location and detects a light signal 540. The photodetector 526 is communicatively coupled to a controller 525 that reads the light signal 540. For example, the controller 525 can access a lookup table containing a library of recognizable light signals. The controller 525 can use the light signals stored in the lookup table to identify the detected light signal to determine information about the syringe. Therefore, with... Figure 14 Unlike other optical detection systems, light can propagate alongside the base wall 518 without passing through it. The light can then be reflected by the base wall 518 toward the photodetector 526.

[0142] Optionally, the base portion may prevent a considerable amount of electromagnetic radiation with detectable wavelengths from propagating from the loading edge 544 through the base wall 518 to the reflecting slopes 530, 532. For example, at least one of the following situations may exist: (a) the base portion is formed of an opaque material; (b) the outer surface of the base portion is coated with an opaque material; or (c) the base portion includes discontinuities that scatter electromagnetic radiation. In other words, the discontinuities scatter electromagnetic radiation such that the electromagnetic radiation may not be reflected and adequately detected. As used herein, the term "opaque material" refers to a material through which electromagnetic radiation cannot propagate and thus can be reflected and detected.

[0143] In some embodiments, the base wall 518 is made of a different material than that used for other parts of the syringe barrel. For example, the main portion 304 ( Figure 7 ) and main part 404 ( Figure 11 The base wall 518 may be made of a material different from that of the base portions 304 and 404. The material used for the base portions 304 and 404 may be more suitable for reflecting light. For example, the material used for the base wall 518 or the base portion may be polyethylene terephthalate (PET). Other methods of providing the base wall may include pad printing, hot stamping, insert molding, or 3D printing. In a particular embodiment, the outer surface of the base wall 518 may be stamped or pressed from an opaque material or coated with an opaque material. The opaque material may include reflective foil.

[0144] Figure 15B A syringe verification component 560, which can be used by one or more embodiments described herein, is shown. The syringe verification component 560 includes an identification region 561, a light source 562, a photosensor 563, and a controller 564. The identification region 561 is a shaped portion of the syringe barrel having a base wall 565. The base wall 565 has an inner body surface 566 shaped to provide a light propagation space 567. The light propagation space 567 may be similar to other light propagation spaces described herein. The light propagation space 567 terminates at reflective ramps 568 and 569. The base wall 565 also includes corresponding openings passing through it, which are partially defined by the corresponding reflective ramps 568 and 569.

[0145] As shown, light source 562 generates light 570, which propagates within light propagation space 567 beside base wall 565. Light 570 is reflected in a predetermined manner by reflecting ramps 568 and 569. More specifically, the dimensions, shape, and position of reflecting ramps 568 and 569 are designed such that they guide the light signal 571 radially away from base wall 565 and toward a predetermined position.

[0146] Optionally, the base portion may prevent a considerable amount of electromagnetic radiation with detectable wavelengths from propagating from the loading edge 572 through the base wall 565 to the reflecting slopes 568, 569. For example, at least one of the following situations may exist: (a) the base portion is formed of an opaque material; (b) the inner surface of the base portion is coated with an opaque material; or (c) the base portion includes discontinuities that scatter electromagnetic radiation.

[0147] Figure 16 and Figure 17 This is an end view of the injection system 600 with a cover plate 604. The injection system 600 and the cover plate 604 can be respectively similar to... Figure 1 The injection system 100 and the cover plate 104. For example... Figure 16 and Figure 17 As shown, a cover plate 604 is positioned on the actuating side 610 of the injector head 602. A peripheral lip 624 extends along the periphery of the cover plate 604. The cover plate 604 is positioned such that the syringe opening 616 aligns with a corresponding cavity 617 of the injector head 602. When aligned, the syringe opening 616 and the receiving cavity 617 form corresponding ports 612, 614, which are configured to receive a syringe barrel 625 passing through them. Figure 16 In this configuration, the syringe barrel 625 engages with the port 612 and is in the unlocked position, which can also be referred to as the starting position or the releasable position. Figure 17In the middle position, the syringe barrel 625 is in the locked position. In the locked position, the syringe barrel 625 is operably engaged with the injector head 602, such that the injector head 602 controls the syringe barrel 625.

[0148] like Figure 17 As shown, the cover 604 has a plurality of radially inward surfaces 671, 672 defining a portion of the syringe opening 616. As described herein, the radially inward surfaces and the syringe barrel 625 can be shaped relative to each other such that the radially inward surfaces and the syringe barrel 625 are slidably engaged with each other during a certain operating cycle through which the syringe barrel 625 is rotated by the user to operatively engage the syringe barrel 625 and the injector head 602. In the illustrated embodiment, the radially inward surfaces 671, 672 provide a non-circular shape to the syringe opening. For example, the syringe opening 616 may be oval or have two circular protrusions.

[0149] Specifically, the radially inward surface and the syringe barrel 625 can be shaped relative to each other such that the torque required to rotate the syringe barrel 625 from the starting position is less than the torque required to rotate the syringe barrel 625 at the midpoint between the starting position and the loading position. Alternatively or supplementing to the above, the radially inward surface and the syringe barrel 625 can be shaped relative to each other such that the torque required to rotate the syringe barrel 625 from the loading position is less than the torque required to rotate the syringe barrel 625 at the midpoint between the starting position and the loading position.

[0150] In the illustrated embodiment, each pair of radially inward surfaces 671, 672 and syringe barrel 625 is configured such that the torque required to rotate the syringe barrel 625 from the starting position or from the loading position is less than the torque required to rotate the syringe barrel at the midpoint between the starting position and the loading position. In other words, a user applying force to rotate the syringe barrel 625 from the starting position to the loading position or from the loading position to the starting position will notice that the applied force is less at the beginning or end of the operating circle than at the halfway point of the operating circle. Thus, a tactile indication is provided to the user indicating that the operating circle is effective in engaging the syringe barrel 625 with the injector head 602, and also a tactile indication is provided indicating that the operating circle has ended because the applied force to rotate the syringe barrel 625 decreases just before it stops.

[0151] Figure 17The diagram also shows that the syringe barrel 625 has retaining shoulders 636, 638. Each retaining shoulder 636, 638 has an outer edge 639, the radius of curvature of which approximates the radius of curvature of the syringe barrel 625. Thus, when the outer edge 639 extends about the longitudinal axis 699 of the syringe barrel 625, the outer edge 639 extends parallel to the outer surface of the syringe barrel 625.

[0152] Go to Figure 18 The radially inward surface 671 is identified by a solid line. The dashed line indicates the path occupied by the outer edge 639 of the shoulder during one operating cycle. As shown, the radially inward surface is positioned inward from the dashed line. Thus, during the operating cycle, the outer edge 639 engages the radially inward surface 671. However, engagement is not significant when the outer edge 639 is in the loaded or releasable position. In the illustrated embodiment, engagement (or friction) is strongest at the midpoint. The radially inward surface 671 can be partially bent when the outer edge 639 engages it. The friction generated between the outer edge 639 and the radially inward surface 671 pulls or hinders the operating cycle. More specifically, friction requires more force or torque to rotate the syringe barrel. Thus, friction is minimal when the outer edge 639 is near the releasable or loaded position and maximal when the outer edge 639 is at the midpoint. The variation in force applied to rotate the syringe barrel is configured to be noticeable to the user.

[0153] Return to Figure 17 In the illustrated embodiment, radially inward surfaces 671 and 672 are the surfaces of the bendable ribs 660 and 662, respectively. More specifically, the cover 604 has a cover body 651 that includes a syringe opening 616, tactile openings 652 and 654, and a switching opening (or slot) 656. The tactile openings 652 and 654 and the switching opening 656 may be referred to as auxiliary openings. The tactile opening 652 is a slot that extends parallel to but is spaced apart from the periphery of the corresponding syringe opening 616, such that a strip of material exists between the tactile opening 652 and the corresponding syringe opening 616. This strip of material is the bendable rib 660. Similarly, the tactile opening 654 is a slot that extends parallel to but is spaced apart from the periphery of the corresponding syringe opening 616, such that a strip of material exists between the tactile opening 654 and the corresponding syringe opening 616. This strip of material is the bendable rib 662.

[0154] The bendable ribs 660, 662 may also have radially outward surfaces defining respective tactile openings 652, 654. The bendable ribs 660, 662 are movable when engaged with the syringe barrel, causing changes in the size or shape of the tactile openings. In some embodiments, the injection system may include a shield, such as shield 708. Figure 19The size and shape of the cover are designed to cover the tactile openings 652, 654. In some embodiments, the cover 708 may also be referred to as a side cover.

[0155] Each pair of bendable ribs 660, 662 can work together to provide tactile guidance to a user performing an operating circle on the syringe barrel 625. In other embodiments, only a single bendable rib may be used. In the illustrated embodiment, the radially inward surface is positioned along the bendable rib of the cover. However, in other embodiments, the radially inward surface may be present along other bendable or compressible physical features.

[0156] Figure 17 The diagram also shows that each of the magnetic switches 620 includes a channel 680 extending beside the syringe opening 616 and a permanent magnet 682. In other embodiments, the magnetic switch 620 may include an electromagnet. In the illustrated embodiment, the magnetic switch 620 and the permanent magnet 682 are positioned outside the injector head. For example, the permanent magnet 682 (or electromagnet) may be adjacent to the injector head such that the permanent magnet 682 engages with the injector head or has only a nominal gap (e.g., less than 5 mm) between them. The permanent magnet 682 may snap-fit ​​from the underside of the cover plate 604. The permanent magnet 682 is allowed to slide along or through the channel 680 and along the actuating side 610. The permanent magnet 682 may be configured to move between different positions. For example, the permanent magnet 682 may be moved to a first position to trigger a sensor. The permanent magnet 682 may be moved to a second position to trigger a sensor.

[0157] As mentioned above Figures 3 to 6 As described, the active side 610 may be adjacent to the sensor of the injector head 602. For example, a straight line less than or equal to five (5) centimeters (cm) may extend from a point on the active side 610 to the internal sensor. In some embodiments, the straight line is less than three (3) cm or less than two (2) cm. The permanent magnet 682 generates a magnetic field. When the magnetic field moves with the permanent magnet and passes the sensor in the injector head 602, it is similar to the proximity sensor 259. Figure 5 The sensor is triggered in a manner that allows the flexible ring 226 to engage with a known syringe. In a known system, when the flexible ring 226 is engaged with a known syringe, the magnet 227 ( Figure 5 ) relative to proximity sensor 259 ( Figure 5 )move.

[0158] However, in embodiments of this application, the magnetic switch 620 can be activated independently of the rotation of the syringe barrel 625. For example, when the syringe barrel 625 is operatively engaged with or operatively engaged by the injector head 602, the syringe barrel 625 may not engage the flexible ring 226. Figure 3Or it may not move. Therefore, the internal magnet does not move, and the magnetic field of the internal magnet does not move and does not trigger the internal sensor, such as sensor 229. Figure 5 ).

[0159] Nevertheless, the external magnet described herein can independently trigger the internal sensor. When the internal sensor is triggered by the magnetic switch 620, the injector head 602 can respond. For example, the injector head 602 can illuminate the reflective ramp to generate a light signal and confirm or identify the presence of the syringe barrel 625. The injector head 602 can also prepare the piston to engage with the plunger within the passage by advancing the piston through the passage. Additionally, in some embodiments, the syringe barrel 625 can be partially retracted, such that the leading flange ( Figure 17 (Not shown in the image) Joining lip 260 ( Figure 4 ).

[0160] It should be noted that, in addition to other known syringe barrels (e.g., syringe 204, etc.), some embodiments may also be operable with syringe barrels described herein (such as syringe barrels 300, 625, 702, etc.). Thus, the injector head may be operable to engage syringe barrels with different designs, one engaging with a flexible ring and the other not engaging with a flexible ring.

[0161] Figures 19 to 21 An injection sub-component 700 formed according to one embodiment is shown. Figure 19 This is an exploded view of an injection subassembly 700 formed according to an embodiment. As shown, the injection subassembly 700 includes a syringe barrel 702, a plunger assembly 704, and a cover plate 706. The syringe barrel 702 may be similar to or the same as other syringe barrels described herein. The cover plate 706 may also be similar to or the same as other cover plates described herein.

[0162] The injection subassembly 700 also includes a shroud 708 and a strip or belt 710. The shroud 708 is configured to cover the cover plate 706. For example, the shroud 708 may cover tactile openings and switch openings to prevent leaked liquid from entering. The shroud 708 may be removably coupled, such that, for example, the shroud 708 can be washed separately and then reinstalled to the cover plate 706.

[0163] The shroud 708, strip 710, and cover 706 combine to form a side cover 725 configured to cover at least a portion of the operating side of the injector head. In the illustrated embodiment, side cover 725 is an assembly comprising three discrete elements. In other embodiments, the side cover may comprise only two elements (e.g., a shroud and a cover, or a strip and one of the shroud or cover). The side cover may comprise more than three elements. In still other embodiments, the side cover comprises only shroud 708 or only cover 706 or similar elements. For example, cover 604 may be referred to as a side cover. The shroud 708, cover 706, and side cover 725 may also be referred to as a support structure for the magnetic switch 738. Therefore, when recited in the claims, the term "side cover" includes a cover that is the same as or similar to a cover or shroud.

[0164] Although the illustrated embodiments show an injection subassembly 700 including a syringe barrel 702, a plunger assembly 704, a shield 708, a strip 710, and a cover plate 706, other embodiments may include fewer or more components than those shown. For example, in some embodiments, the injection subassembly 700 may include only the cover plate 706 and the shield 708.

[0165] Each plunger assembly 704 is configured to engage the distal end of a piston (not shown). As shown, the plunger assembly 704 includes a plunger cap 711, an inner member 712, and piston connectors 713, 714. The plunger cap 711, inner member 712, and piston connectors 713, 714 can be stacked together and inserted through the loading opening 720 of the respective syringe barrel 702.

[0166] Figure 20 It is a front-view stereoscopic view of the injected sub-component 700, and Figure 21 This is a rear perspective view of the injection subassembly 700. As shown, the shield 708 and optional strip 710 can be configured to substantially cover the entire cover 706, except for the syringe opening 730 (also shown in...). Figure 19 (Middle). The shield 708 includes a shield opening 732 aligned with the syringe opening 730. Figure 20 ).

[0167] The cover plate 706 has a contour body configured to extend over and cover the injector head. The cover plate 706 forms a bowl-shaped or basin-shaped structure 734 that receives a portion of the injector head. The shield 708 has a bowl-shaped or basin-shaped structure of similar size that receives the cover plate 706. In some embodiments, the cover plate 706 and the shield 708 each include gripping extensions 707 and 709. The gripping extension 707 is positioned along the periphery of the cover plate 706. The gripping extension 707 is positioned to form a plurality of gaps 736, at which the gripping extension 709 of the shield 708 is positioned. Thus, when coupled to the injector head, the gripping extensions can be evenly distributed around the injector head. In alternative embodiments, the shield 708 is not directly coupled to the injector head. For example, the shield may be directly coupled to the cover plate 706.

[0168] When the injection subassembly 700 is fully constructed and the syringe barrel 702 is operably loaded, the retaining shoulder of the syringe barrel 702 is coplanar with the bendable rib of the cover plate 706. In some embodiments, the shield 708 covers the bendable rib such that the retaining shoulder moves between the injector head and the shield 708 when the syringe barrel is rotated. In other embodiments, the bendable rib may be covered by the shield 708.

[0169] Figure 22 This is an enlarged view of the bottom side of the injection sub-assembly 700. The injection sub-assembly 700 also includes a magnetic switch 738 (also present). Figure 20 As shown herein, the magnetic switch 738 can be similar to magnetic switches 120 and 620. Magnetic switch 738 includes an external magnet 740 and a movable switch body 742 coupled to and carrying the external magnet 740. In the illustrated embodiment, the external magnet 740 is a permanent magnet. In other embodiments, magnetic switch 738 includes an electromagnet. In the illustrated embodiment, magnetic switch 738 and external magnet 740 are positioned outside the injector head. For example, external magnet 740 may be adjacent to the injector head such that external magnet 740 engages with the injector head or has only a nominal gap between them (e.g., less than 5 mm). However, it is contemplated that external magnet 740 may be positioned further away from the injector head. Other magnetic switches described herein (e.g., magnetic switches 120 and 620) can operate in a similar manner to magnetic switch 738.

[0170] An external magnet 740 is operable to alter the magnetic field experienced by an internal sensor, thereby activating the internal sensor. In some embodiments, the movable switch body is a slider configured to slide along a cover 706. In other embodiments, the movable switch body may be a toggle switch, rocker switch, or push-button switch(s). The movable switch body 742 may include a first arm 744 and a second arm 746 that engage and grip the external magnet 740. The movable switch body 742 is coupled to the body 748 of the housing 708 and configured to slide around the housing opening 732. The magnet 740 and arms 744, 746 extend through opposing slots 750, 752 of the housing 708 and the cover 706, respectively. When the movable switch body 742 is moved by a user, the magnet 740 may slide through the slots 750, 752. The slots 750, 752 may combine to form a track. In the illustrated embodiment, the track is an arcuate track extending along the syringe opening. The slots 750 and 752 can be configured (e.g., their size, shape, and position are designed) such that the external magnet 740 is located above the sensor and at a designated position within the track. For example, the midpoint of the track can correspond to the position of the magnet 640 above the sensor.

[0171] However, in some embodiments, the sensor may also be affected by the magnetism of an internal magnet that is movable within the injector head. For example, flexible ring 226 ( Figure 3 Connected to the movable internal permanent magnet 227 ( Figure 5 In such an embodiment, when the injector head includes an internal magnet 227 (or a similar movable internal permanent magnet), the magnetic switch is configured to take into account the magnetic field generated by the internal magnet.

[0172] In an alternative embodiment, the injection subassembly 700 does not include a shield 708 or cover 706, but does include a magnetic switch 738. In such an embodiment, a support structure can hold the magnetic switch. For example, the housing of the magnetic switch can be attached to one side of the injector head, such as the actuating side or the other side.

[0173] Figure 23This is a schematic diagram illustrating the magnetic influence of the internal magnet 802 and the external magnet 804 on the internal sensor 806. The external magnet 804 is part of the magnetic switch 800. The internal magnet 802 and the internal sensor 806 are positioned within the injector head 801. The influence of the external magnet 804 on the internal sensor 806 can be controlled by specifying a range of relative positions of the external magnet 804. For example, the external magnet 804 can be movable along a track or slot, such that the external magnet 804 will remain in the plane of the track but can be positioned differently within the slot. As indicated in Figure 23, the external magnet 804 can move between two different ends 812, 814 within the track 810.

[0174] Although the illustrated embodiment shows the magnetic switch positioned along the syringe barrel from its extended operating side, other embodiments may include a magnetic switch in a different location. For example, the magnetic switch 800 or the external magnet 804 may be positioned along its outer side, which extends vertically relative to the horizontal operating side.

[0175] The total magnetic effect on the internal sensor 806 may also be affected by the position of the internal magnet 802. As described herein, although the internal magnet 802 may be movable relative to the internal sensor 806, at least some embodiments prevent the internal magnet 802 from being moved by more than a negligible amount. For example, the syringe barrel may not engage with the flexible ring holding the internal magnet 802.

[0176] The internal magnet 802 and the external magnet 804 have corresponding magnetic fields 803 and 805, respectively. Figure 23 In this embodiment, the magnetic field 805 of the external magnet 804 is aligned with the rear side 809 of the internal sensor 806, and the magnetic field 803 of the internal magnet 802 is aligned with the front side 807 of the internal sensor 806. In the illustrated embodiment, magnetic fields 803 and 805 are generated by the south pole of the respective magnet, but in other embodiments they may be generated by the north pole of the respective magnet. In still other embodiments, magnetic fields 803 and 805 may be generated by different poles.

[0177] exist Figure 23In this configuration, internal magnet 802 and external magnet 804 are positioned such that internal sensor 806 indicates the presence of a syringe (e.g., is operatively engaged with the injector head). However, in the absence of external magnet 804, the position of internal magnet 802 will cause internal sensor 806 to indicate the absence of a syringe. More specifically, the designated position of external magnet 804 has the same effect as moving internal magnet 802 away from internal sensor 806. In other words, magnetic field 805 reduces the strength of magnetic field 803, thereby causing the circuitry of internal sensor 806 to indicate the presence of a syringe. If external magnet 804 is moved further away from the rear side 809 of internal sensor 806, the total magnetic field experienced by the circuitry of internal sensor 806 will increase because the strength of magnetic field 805 has decreased. However, if external magnet 804 is moved to the front side 807 of internal sensor 806, the total magnetic field experienced by the circuitry of internal sensor 806 will increase because the strength of magnetic field 805 is increased to the strength of magnetic field 803. Therefore, the external magnet 804 can be moved in either direction to increase the total magnetic field experienced by the circuitry of the internal sensor 806 and cause the internal sensor 806 to indicate that the syringe is not present.

[0178] Figure 24 This is a schematic diagram of a magnetic switch 900 and illustrates the magnetic effects of an internal magnet 902 and an external magnet 904 on an internal sensor 906. The external magnet 904 is operable to alter the magnetic field experienced by the internal sensor 906 to activate it. The magnetic switch 900 and the external magnet 904 are positioned outside the injector head 901. The external magnet 904 may be located close to the injector head 901, such that it engages with the injector head 901, or there may be only a nominal gap between them (e.g., less than 5 mm). However, it is contemplated that the external magnet may be positioned further away from the injector head 901. Other magnetic switches described herein (e.g., magnetic switches 120, 620, and 738) may be configured to operate in a similar manner to magnetic switch 900.

[0179] The magnetic switch 900 includes an external magnet 904, a power supply 917, a support structure 920, and a button 924. In Figure 24, the external magnet 904 is an electromagnet having a magnetic core 930 and a conductor 932 wrapped around the magnetic core 930. The conductor 932 is electrically coupled to the power supply 917 (e.g., a battery). For example, the power supply 917 can be activated when a user presses the button 924. The button 924 is connected to the support structure 920. Figure 24In this embodiment, the support structure 920 is the housing of the magnetic switch 900. However, in other embodiments, the support structure may be a side cover, such as a shield and / or cover plate described herein. When the power supply 917 is activated, the electromagnet generates a corresponding magnetic field that affects the total magnetic field experienced by the internal sensor.

[0180] While various spatial and directional terms such as top, bottom, lower, middle, side, horizontal, vertical, and front may be used to describe embodiments of this disclosure, it should be understood that such terms are used only with respect to the orientations shown in the accompanying drawings. These orientations may be inverted, rotated, or otherwise altered such that upper is lower, or vice versa, horizontal becomes vertical, and so on.

[0181] Variations and modifications of the foregoing content fall within the scope of this invention. It should be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute a variety of different alternative aspects of the invention. The embodiments described herein illustrate the best mode known for practicing the invention and will enable others skilled in the art to utilize the invention. The claims should be interpreted to include alternative embodiments within the scope permitted by the prior art.

Claims

1. An injection system, comprising: An injector head configured to control the delivery of a specified fluid to a patient, the injector head including a syringe interface along an actuating side of the injector head, the syringe interface having a receiving cavity configured to directly receive a syringe barrel; as well as Unlike the side cap of the injector head, the side cap has a syringe opening passing through it, and the size and shape of the side cap are designed to cover at least a portion of the working side of the injector head such that the receiving cavity and the syringe opening are aligned with each other to form a port for receiving the syringe barrel, wherein the side cap is detachably mounted to the injector head, and wherein the side cap has a bendable rib having a radially inward surface defining a portion of the port.

2. The injection system as claimed in claim 1, wherein, The injector head is part of a system that can operate without the side cover.

3. The injection system as described in claim 1, wherein, The bendable rib has a radially outward surface defining a tactile opening, and the bendable rib moves when engaged with the syringe barrel such that the size or shape of the tactile opening changes as the bendable rib moves.

4. The injection system as described in claim 3, wherein, The side cover includes a shield and a cover plate having the tactile opening, the shield being sized and shaped to cover the tactile opening.

5. The injection system as claimed in claim 4, wherein, The protective cover shall cover at least 90% of the outer surface of the cover plate.

6. The injection system as claimed in claim 1, wherein, The side cover includes a cover plate covering at least a portion of the functional side and a protective cover covering at least a portion of the cover plate.

7. The injection system of claim 6, wherein, The cover includes an auxiliary opening and the syringe opening, and the shield covers the auxiliary opening but does not cover the syringe opening.

8. The injection system of claim 6, wherein, The cover plate and the protective cover are stacked side by side and fixed together.

9. The injection system of claim 8, further comprising a strip, wherein the cover and the shield are secured together by the strip.

10. The injection system of claim 9, wherein, The side cover covers at least 90% of the outer surface of the functional side.

11. The injection system of claim 9, further comprising an external magnet coupled to the side cover, the external magnet being at least one of: (a) a permanent magnet operable to move relative to the injector head, and (b) an electromagnet.

12. The injection system of claim 11, wherein, At least one of the cover plate and the protective cover has a corresponding slot for receiving the external magnet, which is movable within the corresponding slot.

13. The injection system of claim 1, wherein the receiving cavity is coaxially aligned with the syringe opening.

14. The injection system of claim 1, wherein the side cap is sized and shaped to cover the entire working side of the injector head.

15. An injection system, comprising: A syringe barrel having a passage extending along a longitudinal axis between an end opening and a loading opening of the syringe barrel; An injector head configured to control the delivery of a specified fluid to a patient, the injector head including a syringe interface along an actuating side of the injector head, the syringe interface having a receiving cavity configured to directly receive the syringe barrel; as well as Unlike the side cap of the injector head, the side cap has a syringe opening passing through it, and the size and shape of the side cap are designed to cover at least a portion of the working side of the injector head, such that the receiving cavity and the syringe opening are aligned with each other to form a port for receiving the syringe barrel; and The syringe barrel is configured to rotate one operating turn between a starting position and a loading position. The syringe barrel is releasable when in the starting position. The side cap has a radially inward surface defining a portion of the syringe opening. The radially inward surface and the syringe barrel are shaped relative to each other such that the radially inward surface and the syringe barrel are slidably engaged with each other during the operating turn. The radially inward surface and the syringe barrel are shaped relative to each other such that the torque required to rotate the syringe barrel from the starting position or from the loading position is less than the torque required to rotate the syringe barrel from one or more points between, but not including, the starting position and the loading position.

16. The injection system of claim 15, wherein, The side cover includes a bendable or compressible physical feature, which includes the radially inward surface.

17. The injection system of claim 15, wherein, The side cover is removable.

18. The injection system of claim 15, wherein, The side cover includes a lip that extends around most of the periphery of the side cover.

19. The injection system of claim 15, wherein the side cap is sized and shaped to cover the entire working side of the injector head.

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