Crime scene DNA identifier

Abstract

This disclosure describes a device for obtaining a blood sample from an intruder at a crime scene to be later analyzed for DNA. A projectile containing a blood-extracting needle for penetrating the skin of said intruder is mounted through a protective chamber and connected to a blood reservoir in the chamber interior. A vacuum is held in both the reservoir and the chamber. The chamber vacuum is released by forward movement of the chamber as it slides within a casing following further penetration of the needle. The vacuum release acts to reduce the ambient pressure within the forward portion of the casing, thus assisting in propelling the needle into the intruder. As the needle reaches maximum extension, a loaded spring within the casing is released, propelling the needle and reservoir away from the intruder

Description

FIELD OF THE INVENTION

[0002] This invention relates to crime deterrence; and in particular to identifying a perpetrator in the commission of crimes such as burglary, robbery, breaking and entering, and other criminality involving the unauthorized entering of private space and property.

BACKGROUND OF THE INVENTION

[0003] Many conventional technologies are routinely practiced by law enforcement agencies to identify a perpetrator, including fingerprinting, video surveillance, and foot printing. Each also is a deterrent to the commission of crime since criminals know that their widespread use makes it more likely that a perpetrator can be identified and prosecuted.

[0004] These methodologies have their limitations, however, because each can be defeated or at least countered by the criminal. Use of gloves or a facemask, for example, defeats identification by fingerprinting or video surveillance.

[0005] Defenses against crimes of intrusion by potential victims routinely include handguns, mace, stunning devices and the like, which have in common the requirement that the victim must brandish the deterring weapon in close proximity to the criminal intruder. Besides being daunting and dangerous to the victim acting in self-defense, confronting seasoned criminals does not necessarily result in identification. Confronted by weapons, it is all too usual for the criminal to “get the drop” on the victim, or to withdraw from the crime scene. In either case the criminal is not likely to be identified.

SUMMARY OF THE INVENTION

[0006] This invention is a novel approach to deterring crimes of intrusion, by making it more likely that the perpetrator will be identified. Instead of attempting to deter a criminal with methodologies that can be circumvented or fairly readily overcome, such as in the case of guns or video surveillance, this invention is a mechanism for obtaining a blood sample from the intruder to be later analyzed for DNA.

[0007] The invention brings the elements of surprise and speed to the extraction of a blood sample; and thereafter, the invention effectively withdraws the sample from the point of contact by a random ejecting of the blood sample reservoir outside the cognizance of the criminal at the crime scene.

[0008] In a particular embodiment, the invention comprises a self-contained device featuring a skin and clothing-penetrating needle and reservoir assembly, which travels with an extracting and disbursing mechanism. A conventional means of launching the device is provided. Blood extracting is performed by a vacuum chamber connected to the needle interior. The needle assembly mounts onto an exterior wall of a protective chamber and is connected to a blood reservoir in the chamber interior. The chamber and needle ride in a hollow cylindrical casing that contains an eject spring. The components are launched at the intruder, either through aiming by a human or by automated means not involving the human element. The impact on the intruder is non-lethal in concept: the needle and chamber assembly slide in the casing by their flight momentum; and the needle emerges from the casing to commence penetration of the criminal's skin. Insertion is only deep enough to encounter a blood supply. Penetration of the skin is assisted by drawing down the atmospheric pressure in front of the advancing needle, by connecting it to the vacuum of the chamber containing the reservoir. Blood is drawn into the chamber's reservoir even as the device continues to complete its connection to the intruder. At a point during the reservoir filling, the still-traveling chamber trips a spring actuator, which causes the spring to discharge against the needle, and chamber assembly. The action propels the blood sample away from the intruder a distance of some feet or yards.

[0009] Depending on the surrounds at the scene, the DNA-containing chamber will be irretrievable to the criminal because he does not know where to look for it, what to look for, or even whether to look for something. Thus, in addition to possibly being thwarted in the commission of the crime, it is likely that the intruder will leave behind at the crime scene a sample of blood to be located later by the police.

DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic side diagram of a version of the invention, which is hand-held;

[0011] FIG. 2 is a cross-sectional side view of the projectile assembly in an at-rest position;

[0012] FIG. 3 is a cross-sectional side view of the projectile assembly with the interior parts shown in motion just after contact with a body;

[0013] FIG. 4 is a is a cross-sectional side view of the projectile assembly with the needle and associated chambers at their fullest extension;

[0014] FIG. 5 is a cross-section of the projectile assembly ejecting away from the intruder following actuation of an eject spring; and

[0015] FIG. 6 shows a cross-section of the ejected needle, blood reservoir and chamber assembly in flight.

DETAILED DESCCRIPTION OF AN ILLUSTRATIVE EMBODIMENT

[0016] FIG. 1 shows the general working of the invention, embodied in an overall device designated 5 which may be a hand-held item or alternatively a stand, wall, or ceiling-mounted device. Device 5 consists of a barrel 10, a detonation chamber 11, in which is housed a propellant 12, a handle or grip 13 and a triggering mechanism 14 connected to actuate propellant 12. It is understood that propellant 12 may be conventional explosive powder such as used in shot gun ammunition; or a gas cartridge. The chosen propellant is activated in a manner appropriate to it by selecting of a trigger device 14 of which many are well known in the art.

[0017] Housed in barrel 10 is needle projectile assembly 6 shown only in dotted line outline in FIG. 1. Referring now to FIG. 2, needle projectile assembly 6 consists of a needle 15 with an inner passage 26 that hydraulically connects to a reservoir 27 formed in the hollow interior of a cylindrical chamber 28. Chamber 28 in turn is fixedly mounted within an outer chamber 29. Chamber 29 slidbly moves in piston-like fashion along the cylindrical interior wall 7 of a cylindrical casing 30.

[0018] FIG. 2 shown the components of the needle projectile assembly 6 in their at-rest position, that is, as situated before firing from barrel 10. Chamber 29 and needle 15 with its associated chamber 28 and reservoir 26 are positioned to the rear of casing 30 adjacent to a solid cap plate 23 which is fastened to the ends of casing 30 by, for example, an adhesive (not shown). Solidly fastened to the front end of casing 30 as by welding, is a facing 17 having a center circular opening 31 formed with substantially the same diameter as needle 15. The point 16 of needle 15 protrudes slightly from opening 31 when in the at-rest position. Facing 17 includes a hollow collar 32 extending into the space 33 within casing 30 that is forward of chamber 29. An entry orifice 9 in needle 15 connecting to passage 26 is hermetically sealed by the inside cylindrical surface of collar 32 to safeguard against any contaminants lodging in the passage 26 or reservoir 17. Collar 32 slidably mounts needle 15 in a way that allows needle 15 to travel forward and back during its operation, as will be explained below.

[0019] A coil spring 34 is butted up against the interior surface of facing 17 and is held in compression by a pin 35 affixed to the end of collar 32. Also mounted from collar 32 is an elongate pushrod 36, the end 37 of which is oriented toward an entry hole 38 in chamber 29. A snug-fitting elastic plug 39 is frictionally lodged in hole 38, so that an initial high vacuum can be imparted to the interior void 45 of chamber 29.

[0020] FIG. 3 shows the needle projectile assembly 6 shortly following its launch from barrel 10, at a point when the assembly has encountered the body and clothes of an intruder (not shown). During flight, plate 23 has separated from its adhesive mount on the end of casing 30, thus opening the end of casing 30 for the exiting of needle 15 and its connected chambers 26 and 28 later. The impact stops casing 30 and the components connected to it including collar 32, spring 34 and rod 36. The momentum of needle 15 and the connected chamber 26 and chamber 28, however, cause these components to continue traveling into the space 33. During this travel, needle 15 emerges through a protective membrane 40 that covers the outside surface of facing 17; and its point 16 commences its penetration of the intruder's clothes and skin. The interval between the needle 15 and its blood-receiving orifice 9 from membrane 40 and its penetration into the skin of the intruder, may be controlled to within milliseconds. Blood drawing commences even before chamber 2 has completed its forward travel.

[0021] Substantially concurrent with the emergence of needle 15 from membrane 40, rod 36 impacts and dislodges plug 39 in the front wall of chamber 29. With the plug 39 dislodged, the vacuum within chamber 29 draws air at atmospheric pressure from space 33, thus greatly reducing air pressure in space 33. This pressure differential between space 33 and the space 46 to the rear of chamber 29, further drives needle 15 into the skin and body of the intruder.

[0022] FIG. 4 shows the relative positions of the casing 30 and the needle 15 when the needle-chamber assembly 15-28 reaches the spring 34. Pin 35, which normally holds spring 34 in compression, is sheared off by the forward travel of shear pin 41 formed in the face of chamber 29. As shown in FIG. 5, spring 34 is now released from its compression, and expands away from the interior surface of facing 17. Needle 15, chamber 29 and chamber 28 with its acquired sample of blood in reservoir 27 are propelled outwardly as illustrated in FIG. 6, away from the intruder.

[0023] The entire physical encounter of the described device with the intruder consumes from 1 to 2 seconds. So instantaneous is the experience that it is highly probable the intruder literally will not suspect, much less know what hit him, The blood sample is removed several feet or yards from the intruder. Its sturdy reservoir construction of the needle 15, chamber 29 and chamber 28 assembly makes it difficult to compromise without suitable tools, even if the intruder can locate it and recognize it for what it is. Police at the scene will later retrieve the assembly and analyze the blood for DNA; which when linked with the intruder will establish the element of presence at the crime scene.

[0024] Although the preceding illustrative embodiment is of a hand-held version of the invention, it is apparent that the device with routine exercise of skills in the art can be mounted on a stand, or advantageously, on a video surveillance camera

Claims

1. Apparatus for obtrusively obtaining a blood sample from an intruder at a crime scene to be later analyzed for DNA, said apparatus comprising: a blood-extracting needle for penetrating the skin of said intruder; a blood-collecting reservoir connected to said needle; means for propelling said needle and the connected said reservoir into contact with an intruder; means responsive to said contact for inserting said needle into said intruder; and means responsive to a maximum penetration of said needle into said intruder for extracting said needle and for ejecting said needle and associated reservoir a substantial distance from said intruder.

2. Apparatus in accordance with claim 1, further comprising: A first chamber: Means for mounting said needle on said first chamber: Means for mounting said reservoir in said first chamber: and Means for holding an initial vacuum in said first chamber.

3. Apparatus in accordance with claim 1, further comprising: A cylindrical casing having a cylindrical interior; Said first chamber being slidably mounted in said cylindrical interior; A facing at a first end of said casing and having a center hole for receiving said needle; A coil spring positioned adjacent to the interior side of said facing; and Retaining means for securing said coil spring in a normally loaded mode.

4. Apparatus in accordance with claim 3, further comprising: An extension collar attached to said facing for receiving said needle; Said collar comprising an elongate rearward-extending rod; Said means for holding an initial vacuum in said first chamber comprising an entrance to the interior of said first chamber facing said rod; and a plug inserted in said first chamber entrance; said rod punching out said plug as said first chamber travels toward said rod following said contact with said intruder thereby releasing said vacuum and reducing pressure in the space occupied by said spring and said collar.

5. Apparatus in accordance with claim 4, further comprising: An extension disposed on the exterior of said first chamber Said extension being in alignment with said coil spring retaining means; Whereby forward movement of said first chamber shears said retaining means thereby releasing said spring and ejecting said first chamber said reservoir and said needle from said and said casing.